"""
mcp_manager.py  --  A form-based editor for Claude Desktop MCP servers.

Edit the `mcpServers` block of one or more Claude installs without ever
hand-writing JSON. Validates, checks that each server's command actually exists
on PATH, backs up before writing, and never touches any other key in your config.

Run:  python mcp_manager.py
"""

from __future__ import annotations

import sys
from pathlib import Path

from PySide6.QtCore import QRect, QSettings, QSize, Qt, QThread, QTimer, Signal
from PySide6.QtGui import QAction, QColor, QGuiApplication, QPainter
from PySide6.QtWidgets import (
    QAbstractItemView,
    QApplication,
    QComboBox,
    QDialog,
    QDialogButtonBox,
    QFileDialog,
    QFrame,
    QGridLayout,
    QHBoxLayout,
    QHeaderView,
    QLabel,
    QLineEdit,
    QMainWindow,
    QMenu,
    QMessageBox,
    QPlainTextEdit,
    QPushButton,
    QSplitter,
    QStackedWidget,
    QTableWidget,
    QTableWidgetItem,
    QVBoxLayout,
    QWidget,
)

import bcc_core as core

# --- One-line rebrand: change this to recolor the whole app --------------- #
ACCENT = "#f97316"  # warm orange
ACCENT_DIM = "#c2570b"
BG = "#1b1d23"
PANEL = "#23262e"
PANEL_2 = "#2b2f39"
TEXT = "#e7e9ee"
MUTED = "#9aa0ad"
BORDER = "#3a3f4b"
GOOD = "#4ade80"
BAD = "#f87171"
WARN = "#fbbf24"

STATUS_COLORS = {"ok": GOOD, "missing": BAD, "warn": WARN, "remote": "#60a5fa", "unknown": WARN}
STATUS_GLYPH = {"ok": "●", "missing": "●", "warn": "▲", "remote": "◆", "unknown": "○"}

STYLESHEET = f"""
* {{ font-family: -apple-system, "Segoe UI", "Inter", "DejaVu Sans", sans-serif; font-size: 13px; color: {TEXT}; }}
QMainWindow, QDialog {{ background: {BG}; }}
QLabel#h1 {{ font-size: 15px; font-weight: 600; }}
QLabel#muted {{ color: {MUTED}; }}
QFrame#card {{ background: {PANEL}; border: 1px solid {BORDER}; border-radius: 10px; }}
QLineEdit, QPlainTextEdit, QComboBox {{
    background: {PANEL_2}; border: 1px solid {BORDER}; border-radius: 7px;
    padding: 6px 8px; selection-background-color: {ACCENT}; selection-color: #1a1205;
}}
QLineEdit:focus, QPlainTextEdit:focus, QComboBox:focus {{ border: 1px solid {ACCENT}; }}
QComboBox::drop-down {{ border: none; width: 22px; }}
QComboBox QAbstractItemView {{ background: {PANEL_2}; border: 1px solid {BORDER};
    selection-background-color: {ACCENT}; outline: none; }}
QPushButton {{ background: {PANEL_2}; border: 1px solid {BORDER}; border-radius: 7px;
    padding: 7px 13px; }}
QPushButton:hover {{ border: 1px solid {ACCENT}; }}
QPushButton:disabled {{ color: {MUTED}; background: {PANEL}; }}
QPushButton#primary {{ background: {ACCENT}; border: 1px solid {ACCENT}; color: #1a1205; font-weight: 600; }}
QPushButton#primary:hover {{ background: {ACCENT_DIM}; }}
QPushButton#primary:disabled {{ background: {PANEL}; color: {MUTED}; border: 1px solid {BORDER}; }}
QPushButton#danger:hover {{ border: 1px solid {BAD}; color: {BAD}; }}
QTableWidget {{ background: {PANEL}; border: 1px solid {BORDER}; border-radius: 10px;
    gridline-color: transparent; outline: none; }}
QTableWidget::item {{ padding: 6px 8px; border: none; }}
QTableWidget::item:selected {{ background: {ACCENT}; color: #1a1205; }}
/* Inline cell editors: the global QLineEdit padding/radius clips the text
   inside a table row, so give editors a compact, flat style instead. */
QTableWidget QLineEdit {{
    background: {PANEL_2}; color: {TEXT}; border: 1px solid {ACCENT};
    border-radius: 3px; padding: 0px 4px; margin: 0px;
    selection-background-color: {ACCENT_DIM}; selection-color: #ffffff;
}}
QHeaderView::section {{ background: {PANEL}; color: {MUTED}; border: none;
    border-bottom: 1px solid {BORDER}; padding: 8px; font-weight: 600; }}
QScrollBar:vertical {{ background: transparent; width: 10px; margin: 2px; }}
QScrollBar::handle:vertical {{ background: {BORDER}; border-radius: 5px; min-height: 24px; }}
QScrollBar::add-line, QScrollBar::sub-line {{ height: 0; }}
QLabel#statusbar {{ color: {MUTED}; padding: 4px 2px; }}
QLabel#section {{ color: {MUTED}; font-weight: 600; font-size: 12px; padding: 2px 2px; }}
QLabel#sectionDisabled {{ color: {MUTED}; font-weight: 600; font-size: 12px; padding: 2px 2px; }}
QLabel#placeholder {{ color: {MUTED}; padding: 12px; background: {PANEL_2}; border: 1px dashed {BORDER}; border-radius: 8px; }}
QTableWidget#disabledTable {{ background: #202229; }}
QTableWidget#disabledTable::item:selected {{ background: {ACCENT}; color: #1a1205; }}
QPlainTextEdit#diag {{ font-family: "SF Mono", "Cascadia Code", "Consolas", "DejaVu Sans Mono", monospace;
    font-size: 12px; background: #16181d; border: 1px solid {BORDER}; border-radius: 8px; }}
QFrame#diagCard {{ background: transparent; border: none; }}
QSplitter::handle {{ background: transparent; }}
QSplitter::handle:hover {{ background: {BORDER}; border-radius: 4px; }}
QSplitter::handle:pressed {{ background: {ACCENT}; border-radius: 4px; }}
"""


# --------------------------------------------------------------------------- #
# Background reachability tester (keeps the UI responsive during the request)
# --------------------------------------------------------------------------- #
class ConnTester(QThread):
    done = Signal(bool, str)

    def __init__(self, url, timeout=5.0):
        super().__init__()
        self.url = url
        self.timeout = timeout

    def run(self):
        ok, detail = core.test_remote(self.url, self.timeout)
        self.done.emit(ok, detail)


# --------------------------------------------------------------------------- #
# Small reusable: key/value editor (for env and headers)
# --------------------------------------------------------------------------- #
class KeyValueTable(QWidget):
    def __init__(self, key_label="Key", val_label="Value", on_change=None, before_change=None):
        super().__init__()
        self._on_change = on_change
        self._before_change = before_change
        self._key_label = key_label
        self._val_label = val_label
        lay = QVBoxLayout(self)
        lay.setContentsMargins(0, 0, 0, 0)
        lay.setSpacing(6)
        self.table = QTableWidget(0, 2)
        self.table.setHorizontalHeaderLabels([key_label, val_label])
        self.table.horizontalHeader().setSectionResizeMode(0, QHeaderView.ResizeMode.Stretch)
        self.table.horizontalHeader().setSectionResizeMode(1, QHeaderView.ResizeMode.Stretch)
        self.table.verticalHeader().setVisible(False)
        # Rows tall enough that the inline editor doesn't crush the text.
        self.table.verticalHeader().setDefaultSectionSize(34)
        self.table.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
        self.table.setMinimumHeight(90)
        self.table.itemChanged.connect(self._changed)
        lay.addWidget(self.table, 1)
        row = QHBoxLayout()
        add = QPushButton("+ Add")
        rem = QPushButton("− Remove")
        add.clicked.connect(self._add_row)
        rem.clicked.connect(self._remove_row)
        row.addWidget(add)
        row.addWidget(rem)
        row.addStretch()
        lay.addLayout(row)

    def _changed(self, *_):
        if self._on_change:
            self._on_change()

    def _add_row(self):
        dlg = QDialog(self.window())
        dlg.setWindowTitle(f"Add {self._key_label}")
        dlg.setMinimumWidth(340)
        v = QVBoxLayout(dlg)
        v.setSpacing(10)

        grid = QGridLayout()
        grid.setSpacing(8)
        lbl_k = QLabel(f"{self._key_label}:")
        lbl_k.setObjectName("muted")
        grid.addWidget(lbl_k, 0, 0)
        key_edit = QLineEdit()
        key_edit.setPlaceholderText(
            "e.g. API_KEY" if self._key_label == "Variable" else f"{self._key_label.lower()}-name"
        )
        grid.addWidget(key_edit, 0, 1)

        lbl_v = QLabel(f"{self._val_label}:")
        lbl_v.setObjectName("muted")
        grid.addWidget(lbl_v, 1, 0)
        val_edit = QLineEdit()
        val_edit.setPlaceholderText("value")
        grid.addWidget(val_edit, 1, 1)
        v.addLayout(grid)

        btns = QDialogButtonBox(
            QDialogButtonBox.StandardButton.Ok | QDialogButtonBox.StandardButton.Cancel
        )
        ok_btn = btns.button(QDialogButtonBox.StandardButton.Ok)
        ok_btn.setObjectName("primary")
        ok_btn.setEnabled(False)
        key_edit.textChanged.connect(lambda t: ok_btn.setEnabled(bool(t.strip())))
        btns.accepted.connect(dlg.accept)
        btns.rejected.connect(dlg.reject)
        v.addWidget(btns)

        key_edit.setFocus()
        # Enter in key field moves to value; Enter in value field submits
        key_edit.returnPressed.connect(val_edit.setFocus)
        val_edit.returnPressed.connect(lambda: ok_btn.click() if ok_btn.isEnabled() else None)

        if dlg.exec() != QDialog.DialogCode.Accepted:
            return
        k = key_edit.text().strip()
        val = val_edit.text()
        if not k:
            return
        if self._before_change:
            self._before_change()
        r = self.table.rowCount()
        self.table.insertRow(r)
        self.table.setItem(r, 0, QTableWidgetItem(k))
        self.table.setItem(r, 1, QTableWidgetItem(val))
        self._changed()

    def _remove_row(self):
        r = self.table.currentRow()
        if r < 0:
            return
        if self._before_change:
            self._before_change()
        self.table.removeRow(r)
        self._changed()

    def load(self, d: dict):
        self.table.blockSignals(True)
        self.table.setRowCount(0)
        for k, v in (d or {}).items():
            r = self.table.rowCount()
            self.table.insertRow(r)
            self.table.setItem(r, 0, QTableWidgetItem(str(k)))
            self.table.setItem(r, 1, QTableWidgetItem(str(v)))
        self.table.blockSignals(False)

    def dump(self) -> dict:
        out = {}
        for r in range(self.table.rowCount()):
            k = self.table.item(r, 0)
            v = self.table.item(r, 1)
            k = k.text().strip() if k else ""
            v = v.text() if v else ""
            if k:
                out[k] = v
        return out


# --------------------------------------------------------------------------- #
# The server editor panel (right side)
# --------------------------------------------------------------------------- #
class ServerEditor(QFrame):
    def __init__(self, on_change, before_change=None):
        super().__init__()
        self.setObjectName("card")
        self._on_change = on_change
        self._before_change = before_change  # called before any row add/remove in tables
        self._extra = {}  # preserve unknown server fields verbatim
        self._loading = False

        outer = QVBoxLayout(self)
        outer.setContentsMargins(16, 16, 16, 16)
        outer.setSpacing(12)

        title = QLabel("Server details")
        title.setObjectName("h1")
        outer.addWidget(title)

        grid = QGridLayout()
        grid.setVerticalSpacing(10)
        grid.setHorizontalSpacing(10)

        grid.addWidget(self._lbl("Name"), 0, 0)
        self.name = QLineEdit()
        self.name.setPlaceholderText("e.g. filesystem")
        self.name.textChanged.connect(self._emit)
        grid.addWidget(self.name, 0, 1)

        grid.addWidget(self._lbl("Type"), 1, 0)
        self.type = QComboBox()
        self.type.addItems(["Local command (stdio)", "Remote (url)"])
        self.type.currentIndexChanged.connect(self._type_switched)
        grid.addWidget(self.type, 1, 1)
        outer.addLayout(grid)

        # Stacked: stdio page / remote page
        self.stack = QStackedWidget()
        self.stack.addWidget(self._build_stdio_page())
        self.stack.addWidget(self._build_remote_page())
        outer.addWidget(self.stack, 1)

        # Dependency status row
        dep = QHBoxLayout()
        self.dep_dot = QLabel("○")
        self.dep_label = QLabel("—")
        self.dep_label.setObjectName("muted")
        self.fix_btn = QPushButton("Use full path ↳")
        self.fix_btn.setToolTip(
            "Rewrite the bare command to its absolute path so any launch of Claude can find it"
        )
        self.fix_btn.clicked.connect(self._pin_path)
        self.fix_btn.setVisible(False)
        self.test_btn = QPushButton("Test connection")
        self.test_btn.clicked.connect(self._test_remote)
        self.test_btn.setVisible(False)
        self.details_btn = QPushButton("Details ▸")
        self.details_btn.setCheckable(True)
        self.details_btn.toggled.connect(self._toggle_diag)
        recheck = QPushButton("Re-check")
        recheck.clicked.connect(self._recheck)
        dep.addWidget(self.dep_dot)
        dep.addWidget(self.dep_label, 1)
        dep.addWidget(self.fix_btn)
        dep.addWidget(self.test_btn)
        dep.addWidget(self.details_btn)
        dep.addWidget(recheck)
        outer.addLayout(dep)

        # Collapsible diagnostics panel
        self.diag_card = QFrame()
        self.diag_card.setObjectName("diagCard")
        dlay = QVBoxLayout(self.diag_card)
        dlay.setContentsMargins(0, 0, 0, 0)
        dlay.setSpacing(6)
        self.diag_text = QPlainTextEdit()
        self.diag_text.setObjectName("diag")
        self.diag_text.setReadOnly(True)
        self.diag_text.setMaximumHeight(190)
        dlay.addWidget(self.diag_text)
        crow = QHBoxLayout()
        crow.addStretch()
        self.copy_diag_btn = QPushButton("Copy diagnostics")
        self.copy_diag_btn.clicked.connect(self._copy_diag)
        crow.addWidget(self.copy_diag_btn)
        dlay.addLayout(crow)
        self.diag_card.setVisible(False)
        outer.addWidget(self.diag_card)

        self.setEnabled(False)

    def _lbl(self, t):
        lbl = QLabel(t)
        lbl.setObjectName("muted")
        return lbl

    def _build_stdio_page(self):
        w = QWidget()
        v = QVBoxLayout(w)
        v.setContentsMargins(0, 0, 0, 0)
        v.setSpacing(8)
        v.addWidget(self._lbl("Command"))
        self.command = QLineEdit()
        self.command.setPlaceholderText("npx, uvx, node, python3, or a full path")
        self.command.textChanged.connect(self._emit)
        v.addWidget(self.command)
        v.addWidget(self._lbl("Arguments  (one per line)"))
        self.args = ArgsEdit()
        self.args.setPlaceholderText(
            "-y\n@modelcontextprotocol/server-filesystem\n/Users/you/Documents"
        )
        self.args.setMinimumHeight(70)
        self.args.textChanged.connect(self._emit)
        v.addWidget(self.args, 1)
        v.addWidget(self._lbl("Environment variables"))
        self.env = KeyValueTable(
            "Variable", "Value", on_change=self._emit, before_change=self._before_change
        )
        v.addWidget(self.env, 1)
        return w

    def _build_remote_page(self):
        w = QWidget()
        v = QVBoxLayout(w)
        v.setContentsMargins(0, 0, 0, 0)
        v.setSpacing(8)
        v.addWidget(self._lbl("URL"))
        self.url = QLineEdit()
        self.url.setPlaceholderText("https://mcp.example.com/sse")
        self.url.textChanged.connect(self._emit)
        v.addWidget(self.url)
        v.addWidget(self._lbl("Transport"))
        self.transport = QComboBox()
        self.transport.addItems(["(auto)", "http", "sse"])
        self.transport.currentIndexChanged.connect(self._emit)
        v.addWidget(self.transport)
        v.addWidget(self._lbl("Headers"))
        self.headers = KeyValueTable(
            "Header", "Value", on_change=self._emit, before_change=self._before_change
        )
        v.addWidget(self.headers, 1)
        return w

    # --- model <-> form -------------------------------------------------- #
    def load_entry(self, entry: core.ServerEntry | None):
        self._loading = True
        if entry is None:
            self.setEnabled(False)
            self.name.clear()
            self.command.clear()
            self.args.clear()
            self.url.clear()
            self.env.load({})
            self.headers.load({})
            self.details_btn.setChecked(False)
            self.diag_text.clear()
            self._set_dep({"status": "unknown", "label": "—"})
            self._loading = False
            return
        self.setEnabled(True)
        d = entry.data
        self._extra = {k: v for k, v in d.items() if k not in core.KNOWN_FIELDS}
        self.name.setText(entry.name)
        # Reset BOTH pages first so a previously-selected server's values can't
        # leak in if the user flips the type toggle mid-edit.
        self.command.clear()
        self.args.clear()
        self.env.load({})
        self.url.clear()
        self.transport.setCurrentIndex(0)
        self.headers.load({})
        if entry.kind == "remote":
            self.type.setCurrentIndex(1)
            self.stack.setCurrentIndex(1)
            self.url.setText(str(d.get("url", "")))
            t = d.get("type")
            self.transport.setCurrentText(t if t in ("http", "sse") else "(auto)")
            self.headers.load(d.get("headers", {}))
        else:
            self.type.setCurrentIndex(0)
            self.stack.setCurrentIndex(0)
            self.command.setText(str(d.get("command", "")))
            self.args.setPlainText("\n".join(str(a) for a in (d.get("args") or [])))
            self.env.load(d.get("env", {}))
        self._loading = False
        self.refresh_dependency(auto_open=True)

    def dump_data(self) -> dict:
        """Build the server dict from the form, preserving unknown fields."""
        data = dict(self._extra)
        if self.type.currentIndex() == 1:  # remote
            data["url"] = self.url.text().strip()
            t = self.transport.currentText()
            if t in ("http", "sse"):
                data["type"] = t
            else:
                data.pop("type", None)
            headers = self.headers.dump()
            if headers:
                data["headers"] = headers
            else:
                data.pop("headers", None)
            for k in ("command", "args", "env"):
                data.pop(k, None)
        else:  # stdio
            data["command"] = self.command.text().strip()
            args = [ln for ln in self.args.toPlainText().splitlines() if ln.strip() != ""]
            if args:
                data["args"] = args
            else:
                data.pop("args", None)
            env = self.env.dump()
            if env:
                data["env"] = env
            else:
                data.pop("env", None)
            for k in ("url", "type", "headers"):
                data.pop(k, None)
        return data

    def current_name(self) -> str:
        return self.name.text().strip()

    def _type_switched(self):
        self.stack.setCurrentIndex(self.type.currentIndex())
        self._emit()

    def _emit(self):
        if not self._loading and self._on_change:
            self._on_change()
            self.refresh_dependency(auto_open=False)

    # --- dependency ------------------------------------------------------ #
    def refresh_dependency(self, auto_open=False):
        if not self.isEnabled():
            self._set_dep({"status": "unknown", "label": "—"})
            self.diag_text.clear()
            return
        data = self.dump_data()
        res = core.check_dependency(data)
        self._set_dep(res)
        self.fix_btn.setVisible(res["status"] == "warn")
        self.test_btn.setVisible(self.type.currentIndex() == 1)
        problem = res["status"] in ("missing", "warn", "unknown")
        if auto_open and problem and not self.details_btn.isChecked():
            self.details_btn.setChecked(True)  # opens panel (fills text via _toggle_diag)
        if self.diag_card.isVisible():
            self.diag_text.setPlainText(core.diagnostics_text(self.current_name(), data))

    def _set_dep(self, res: dict):
        status = res.get("status", "unknown")
        self.dep_dot.setText(STATUS_GLYPH.get(status, "○"))
        self.dep_dot.setStyleSheet(f"color: {STATUS_COLORS.get(status, MUTED)}; font-size: 14px;")
        self.dep_label.setText(res.get("label", "—"))
        color = STATUS_COLORS.get(status, MUTED) if status in ("missing", "warn") else MUTED
        self.dep_label.setStyleSheet(f"color: {color};")

    def _toggle_diag(self, on):
        self.diag_card.setVisible(on)
        self.details_btn.setText("Details ▾" if on else "Details ▸")
        if on and self.isEnabled():
            self.diag_text.setPlainText(
                core.diagnostics_text(self.current_name(), self.dump_data())
            )

    def _recheck(self):
        core.refresh_path_cache()  # re-scan PATH, e.g. after installing a runtime
        self.refresh_dependency(auto_open=True)

    def _copy_diag(self):
        QGuiApplication.clipboard().setText(self.diag_text.toPlainText())
        self.copy_diag_btn.setText("Copied ✓")
        QTimer.singleShot(1200, lambda: self.copy_diag_btn.setText("Copy diagnostics"))

    def _pin_path(self):
        new_data, note = core.pin_command_path(self.dump_data())
        if not note:
            return
        self._loading = True
        self.command.setText(str(new_data.get("command", "")))
        self.args.setPlainText("\n".join(str(a) for a in (new_data.get("args") or [])))
        self._loading = False
        self._emit()  # writes back to the model and re-checks (should now be ok)

    def _test_remote(self):
        url = self.url.text().strip()
        if not url:
            return
        self.test_btn.setEnabled(False)
        self.test_btn.setText("Testing...")
        self.dep_dot.setText("◆")
        self.dep_dot.setStyleSheet(f"color: {MUTED}; font-size: 14px;")
        self.dep_label.setText("testing reachability...")
        self.dep_label.setStyleSheet(f"color: {MUTED};")
        self._tester = ConnTester(url, timeout=6.0)
        self._tester.done.connect(self._on_test_done)
        self._tester.start()

    def _on_test_done(self, ok, detail):
        self.test_btn.setEnabled(True)
        self.test_btn.setText("Test connection")
        color = GOOD if ok else BAD
        self.dep_dot.setText("●")
        self.dep_dot.setStyleSheet(f"color: {color}; font-size: 14px;")
        self.dep_label.setText(f"reachable · {detail}" if ok else f"unreachable · {detail}")
        self.dep_label.setStyleSheet(f"color: {color};")


# --------------------------------------------------------------------------- #
# Arguments editor: one line = one argument, with a numbered gutter so that
# model is visible (a long path on its own line reads as "arg 2", not as a
# wrapped continuation of arg 1).
# --------------------------------------------------------------------------- #
class _ArgsGutter(QWidget):
    def __init__(self, editor: ArgsEdit):
        super().__init__(editor)
        self._editor = editor

    def sizeHint(self):
        return QSize(self._editor.gutter_width(), 0)

    def paintEvent(self, event):
        self._editor.gutter_paint(event)


class ArgsEdit(QPlainTextEdit):
    def __init__(self):
        super().__init__()
        self.setLineWrapMode(QPlainTextEdit.LineWrapMode.NoWrap)
        self._gutter = _ArgsGutter(self)
        self.blockCountChanged.connect(self._update_gutter_width)
        self.updateRequest.connect(self._on_update_request)
        self._update_gutter_width()

    def gutter_width(self) -> int:
        digits = max(1, len(str(self.blockCount())))
        return 14 + self.fontMetrics().horizontalAdvance("9") * digits

    def _update_gutter_width(self, *_):
        self.setViewportMargins(self.gutter_width(), 0, 0, 0)

    def _on_update_request(self, rect, dy):
        if dy:
            self._gutter.scroll(0, dy)
        else:
            self._gutter.update(0, rect.y(), self._gutter.width(), rect.height())
        if rect.contains(self.viewport().rect()):
            self._update_gutter_width()

    def resizeEvent(self, e):
        super().resizeEvent(e)
        cr = self.contentsRect()
        self._gutter.setGeometry(QRect(cr.left(), cr.top(), self.gutter_width(), cr.height()))

    def gutter_paint(self, event):
        painter = QPainter(self._gutter)
        painter.setPen(QColor(MUTED))
        fm = self.fontMetrics()
        block = self.firstVisibleBlock()
        n = block.blockNumber()
        top = round(self.blockBoundingGeometry(block).translated(self.contentOffset()).top())
        bottom = top + round(self.blockBoundingRect(block).height())
        while block.isValid() and top <= event.rect().bottom():
            if block.isVisible() and bottom >= event.rect().top():
                painter.drawText(
                    0,
                    top,
                    self._gutter.width() - 8,
                    fm.height(),
                    Qt.AlignmentFlag.AlignRight,
                    str(n + 1),
                )
            block = block.next()
            top = bottom
            bottom = top + round(self.blockBoundingRect(block).height())
            n += 1


# --------------------------------------------------------------------------- #
# Paste-JSON dialog
# --------------------------------------------------------------------------- #
class PasteDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Paste MCP JSON")
        self.resize(560, 420)
        self.result_servers: dict[str, dict] | None = None
        v = QVBoxLayout(self)
        info = QLabel(
            "Paste a config snippet from any MCP doc — it doesn't have to be "
            "perfect JSON. Markdown fences, comments, trailing commas, smart "
            "quotes, and missing braces are fixed automatically."
        )
        info.setObjectName("muted")
        info.setWordWrap(True)
        v.addWidget(info)
        self.box = QPlainTextEdit()
        self.box.setPlaceholderText(
            '{\n  "mcpServers": {\n    "brave-search": {\n      "command": "npx",\n      "args": ["-y", "@modelcontextprotocol/server-brave-search"],\n      "env": {"BRAVE_API_KEY": "..."}\n    }\n  }\n}'
        )
        v.addWidget(self.box, 1)
        self.err = QLabel("")
        self.err.setWordWrap(True)
        v.addWidget(self.err)
        btns = QDialogButtonBox()
        self.parse_btn = btns.addButton("Parse & Add", QDialogButtonBox.ButtonRole.AcceptRole)
        self.parse_btn.setObjectName("primary")
        self.parse_btn.setEnabled(False)
        btns.addButton(QDialogButtonBox.StandardButton.Cancel)
        btns.accepted.connect(self._try_parse)
        btns.rejected.connect(self.reject)
        v.addWidget(btns)

        # Live parse-as-you-type, debounced so we don't churn on every keystroke.
        self._debounce = QTimer(self)
        self._debounce.setSingleShot(True)
        self._debounce.setInterval(250)
        self._debounce.timeout.connect(self._preview)
        self.box.textChanged.connect(self._debounce.start)

    def _preview(self):
        text = self.box.toPlainText()
        if not text.strip():
            self.err.setText("")
            self.parse_btn.setEnabled(False)
            return
        try:
            servers, notes = core.parse_pasted_json_verbose(text)
        except Exception as e:
            self.err.setStyleSheet(f"color: {BAD};")
            self.err.setText(str(e))
            self.parse_btn.setEnabled(False)
            return
        names = ", ".join(
            f"{n} ({core.ServerEntry(n, d).kind})" for n, d in list(servers.items())[:6]
        )
        if len(servers) > 6:
            names += f", +{len(servers) - 6} more"
        msg = f"✓ Will add: {names}"
        if notes:
            msg += "\nAuto-repaired: " + "; ".join(notes)
        self.err.setStyleSheet(f"color: {GOOD};")
        self.err.setText(msg)
        self.parse_btn.setEnabled(True)

    def _try_parse(self):
        try:
            self.result_servers = core.parse_pasted_json(self.box.toPlainText())
            self.accept()
        except Exception as e:
            self.err.setStyleSheet(f"color: {BAD};")
            self.err.setText(str(e))


# --------------------------------------------------------------------------- #
# Main window
# --------------------------------------------------------------------------- #
class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Better Claude Config")
        self.resize(940, 640)
        self.setAcceptDrops(True)

        self.profiles: list[core.Profile] = []
        self.full_config: dict = {}
        self.servers: list[core.ServerEntry] = []
        self.current_profile: core.Profile | None = None
        self.dirty = False
        self._suppress_table = False
        self._suppress_sel = False
        self._focused_table = None
        self._row_of_index: dict[int, tuple] = {}
        self._undo_stack: list[list] = []  # each entry: snapshot of self.servers

        central = QWidget()
        self.setCentralWidget(central)
        root = QVBoxLayout(central)
        root.setContentsMargins(14, 14, 14, 10)
        root.setSpacing(12)

        root.addLayout(self._build_topbar())

        # User-draggable divider between the server list and the editor.
        split = QSplitter(Qt.Orientation.Horizontal)
        split.setChildrenCollapsible(False)
        split.setHandleWidth(10)
        split.addWidget(self._build_left())
        self.editor = ServerEditor(on_change=self._editor_changed, before_change=self._push_undo)
        split.addWidget(self.editor)
        split.setStretchFactor(0, 3)
        split.setStretchFactor(1, 4)
        split.setSizes([390, 520])
        self.hsplit = split
        root.addWidget(split, 1)

        root.addLayout(self._build_actionbar())

        self.status = QLabel("Ready.")
        self.status.setObjectName("statusbar")
        root.addWidget(self.status)

        self._restore_layout()
        self.reload_profiles()

    # --- layout persistence ---------------------------------------------- #
    def _restore_layout(self):
        st = QSettings("BCC", "BetterClaudeConfig")
        if geo := st.value("window/geometry"):
            self.restoreGeometry(geo)
        if hs := st.value("window/hsplit"):
            self.hsplit.restoreState(hs)
        if vs := st.value("window/vsplit"):
            self.vsplit.restoreState(vs)

    def _save_layout(self):
        st = QSettings("BCC", "BetterClaudeConfig")
        st.setValue("window/geometry", self.saveGeometry())
        st.setValue("window/hsplit", self.hsplit.saveState())
        st.setValue("window/vsplit", self.vsplit.saveState())

    # --- top bar --------------------------------------------------------- #
    def _build_topbar(self):
        bar = QHBoxLayout()
        lbl = QLabel("Install")
        lbl.setObjectName("muted")
        bar.addWidget(lbl)
        self.profile_combo = QComboBox()
        self.profile_combo.setMinimumWidth(220)
        self.profile_combo.currentIndexChanged.connect(self._profile_selected)
        bar.addWidget(self.profile_combo)
        add_cfg = QPushButton("Add config...")
        add_cfg.clicked.connect(self.add_custom_config)
        bar.addWidget(add_cfg)
        reload_btn = QPushButton("Reload")
        reload_btn.clicked.connect(lambda: self.load_profile(self.current_profile, confirm=True))
        bar.addWidget(reload_btn)
        bar.addStretch()
        self.save_btn = QPushButton("Save")
        self.save_btn.setObjectName("primary")
        self.save_btn.clicked.connect(self.save)
        bar.addWidget(self.save_btn)
        return bar

    # --- left (server table) -------------------------------------------- #
    def _make_server_table(self, object_name=None):
        t = QTableWidget(0, 4)
        if object_name:
            t.setObjectName(object_name)
        t.setHorizontalHeaderLabels(["On", "Name", "Type", "Status"])
        t.verticalHeader().setVisible(False)
        t.setSelectionBehavior(QAbstractItemView.SelectionBehavior.SelectRows)
        t.setSelectionMode(QAbstractItemView.SelectionMode.SingleSelection)
        t.setEditTriggers(QAbstractItemView.EditTrigger.NoEditTriggers)
        h = t.horizontalHeader()
        h.setSectionResizeMode(0, QHeaderView.ResizeMode.ResizeToContents)
        h.setSectionResizeMode(1, QHeaderView.ResizeMode.Stretch)
        h.setSectionResizeMode(2, QHeaderView.ResizeMode.ResizeToContents)
        h.setSectionResizeMode(3, QHeaderView.ResizeMode.ResizeToContents)
        t.itemSelectionChanged.connect(lambda tbl=t: self._on_selection(tbl))
        t.itemChanged.connect(self._table_item_changed)
        return t

    def _build_left(self):
        card = QFrame()
        card.setObjectName("card")
        v = QVBoxLayout(card)
        v.setContentsMargins(12, 12, 12, 12)
        v.setSpacing(8)
        head = QLabel("MCP servers")
        head.setObjectName("h1")
        v.addWidget(head)

        # Active and Disabled sections live in a vertical splitter so the user
        # can drag the divider instead of being stuck with a fixed-height
        # disabled list.
        active_box = QWidget()
        av = QVBoxLayout(active_box)
        av.setContentsMargins(0, 0, 0, 0)
        av.setSpacing(8)
        self.active_label = QLabel("Active")
        self.active_label.setObjectName("section")
        av.addWidget(self.active_label)
        self.active_table = self._make_server_table()
        av.addWidget(self.active_table, 1)
        self.active_empty = QLabel("No active servers. Add one, or Paste JSON.")
        self.active_empty.setObjectName("placeholder")
        self.active_empty.setAlignment(Qt.AlignmentFlag.AlignCenter)
        self.active_empty.hide()
        av.addWidget(self.active_empty)

        disabled_box = QWidget()
        dv = QVBoxLayout(disabled_box)
        dv.setContentsMargins(0, 0, 0, 0)
        dv.setSpacing(8)
        self.disabled_label = QLabel("⊘  Disabled")
        self.disabled_label.setObjectName("sectionDisabled")
        dv.addWidget(self.disabled_label)
        self.disabled_table = self._make_server_table(object_name="disabledTable")
        dv.addWidget(self.disabled_table, 1)
        self.disabled_empty = QLabel("Nothing disabled.")
        self.disabled_empty.setObjectName("placeholder")
        self.disabled_empty.setAlignment(Qt.AlignmentFlag.AlignCenter)
        dv.addWidget(self.disabled_empty)

        vsplit = QSplitter(Qt.Orientation.Vertical)
        vsplit.setChildrenCollapsible(False)
        vsplit.setHandleWidth(10)
        vsplit.addWidget(active_box)
        vsplit.addWidget(disabled_box)
        vsplit.setStretchFactor(0, 3)
        vsplit.setStretchFactor(1, 1)
        vsplit.setSizes([360, 150])
        self.vsplit = vsplit
        v.addWidget(vsplit, 1)
        return card

    # --- bottom action bar ---------------------------------------------- #
    def _build_actionbar(self):
        bar = QHBoxLayout()
        self.add_btn = QPushButton("+ Add")
        self.dup_btn = QPushButton("Duplicate")
        self.del_btn = QPushButton("Delete")
        self.del_btn.setObjectName("danger")
        self.paste_btn = QPushButton("Paste JSON...")
        self.copy_btn = QPushButton("Copy to ▸")
        self.undo_btn = QPushButton("Undo")
        self.undo_btn.setEnabled(False)
        self.undo_btn.setToolTip("Undo last change  (Ctrl+Z)")
        self.add_btn.clicked.connect(self.add_server)
        self.dup_btn.clicked.connect(self.duplicate_server)
        self.del_btn.clicked.connect(self.delete_server)
        self.paste_btn.clicked.connect(self.paste_json)
        self.copy_btn.clicked.connect(self.copy_to_menu)
        self.undo_btn.clicked.connect(self._undo)
        for b in (
            self.add_btn,
            self.dup_btn,
            self.del_btn,
            self.paste_btn,
            self.copy_btn,
            self.undo_btn,
        ):
            bar.addWidget(b)
        # Ctrl+Z shortcut
        undo_action = QAction(self)
        undo_action.setShortcut("Ctrl+Z")
        undo_action.triggered.connect(self._undo)
        self.addAction(undo_action)
        bar.addStretch()
        self.validation_lbl = QLabel("")
        bar.addWidget(self.validation_lbl)
        return bar

    # --- undo ------------------------------------------------------------ #
    def _push_undo(self):
        """Snapshot the current server list onto the undo stack."""
        self._undo_stack.append(
            [core.ServerEntry(s.name, dict(s.data), s.enabled) for s in self.servers]
        )
        if len(self._undo_stack) > 50:
            self._undo_stack.pop(0)
        self.undo_btn.setEnabled(True)

    def _undo(self):
        if not self._undo_stack:
            return
        self.servers = self._undo_stack.pop()
        self.undo_btn.setEnabled(bool(self._undo_stack))
        cur = self._current_index()
        sel = cur if 0 <= cur < len(self.servers) else (0 if self.servers else -1)
        self._refresh_tables(select_index=sel)
        self._mark_dirty()
        self.status.setText("Undone.")

    # --- profiles -------------------------------------------------------- #
    def reload_profiles(self):
        discovered = core.discover_profiles()
        # keep any manually-added custom profiles around
        customs = [p for p in self.profiles if str(p.path) not in {str(d.path) for d in discovered}]
        self.profiles = discovered + customs
        self.profile_combo.blockSignals(True)
        self.profile_combo.clear()
        for p in self.profiles:
            tag = "" if p.config_exists else "  (no config yet)"
            self.profile_combo.addItem(f"{p.label}{tag}")
        self.profile_combo.blockSignals(False)
        if self.profiles:
            self.profile_combo.setCurrentIndex(0)
            self.load_profile(self.profiles[0])
        else:
            self.status.setText('No Claude installs found. Use "Add config…" to point at one.')

    def add_custom_config(self):
        start = str(core.app_support_base())
        path, _ = QFileDialog.getOpenFileName(
            self, "Select a claude_desktop_config.json", start, "JSON (*.json);;All files (*)"
        )
        if not path:
            return
        prof = core.profile_from_path(path)
        if str(prof.path) in {str(p.path) for p in self.profiles}:
            idx = [str(p.path) for p in self.profiles].index(str(prof.path))
            self.profile_combo.setCurrentIndex(idx)
            return
        self.profiles.append(prof)
        self.profile_combo.addItem(f"{prof.label}  (custom)")
        self.profile_combo.setCurrentIndex(self.profile_combo.count() - 1)

    def _profile_selected(self, idx):
        if 0 <= idx < len(self.profiles):
            self.load_profile(self.profiles[idx])

    def load_profile(self, profile: core.Profile | None, confirm=False):
        if profile is None:
            return
        if confirm and self.dirty and not self._confirm_discard():
            return
        try:
            self.full_config = core.load_config(profile.path)
        except Exception as e:
            QMessageBox.critical(
                self,
                "Could not read config",
                f"{profile.path}\n\n{e}\n\nFix the file by hand or pick another install.",
            )
            return
        self.current_profile = profile
        self.servers = core.extract_servers(self.full_config)
        self.dirty = False
        self._undo_stack.clear()
        self.undo_btn.setEnabled(False)
        self._refresh_tables(select_index=0 if self.servers else -1)
        self._update_status(saved=False)

    # --- table rendering ------------------------------------------------- #
    def _add_row(self, table, master_idx, s):
        r = table.rowCount()
        table.insertRow(r)
        on = QTableWidgetItem()
        on.setFlags(
            Qt.ItemFlag.ItemIsUserCheckable
            | Qt.ItemFlag.ItemIsEnabled
            | Qt.ItemFlag.ItemIsSelectable
        )
        on.setCheckState(Qt.CheckState.Checked if s.enabled else Qt.CheckState.Unchecked)
        table.setItem(r, 0, on)
        name_item = QTableWidgetItem(s.name)
        name_item.setData(Qt.ItemDataRole.UserRole, master_idx)  # row -> master list index
        if not s.enabled:
            name_item.setForeground(QColor(MUTED))
        table.setItem(r, 1, name_item)
        type_item = QTableWidgetItem("remote" if s.kind == "remote" else "local")
        if not s.enabled:
            type_item.setForeground(QColor(MUTED))
        table.setItem(r, 2, type_item)
        dep = core.check_dependency(s.data)
        st = QTableWidgetItem(f"{STATUS_GLYPH.get(dep['status'], '○')}  {dep['label']}")
        st.setForeground(
            QColor(STATUS_COLORS.get(dep["status"], MUTED))
        )  # status stays colored even when off
        table.setItem(r, 3, st)
        self._row_of_index[master_idx] = (table, r)

    def _refresh_tables(self, select_index=None):
        self._suppress_table = True
        self._suppress_sel = True
        self._row_of_index = {}
        self.active_table.setRowCount(0)
        self.disabled_table.setRowCount(0)
        n_active = n_disabled = 0
        for i, s in enumerate(self.servers):
            if s.enabled:
                self._add_row(self.active_table, i, s)
                n_active += 1
            else:
                self._add_row(self.disabled_table, i, s)
                n_disabled += 1
        self.active_table.setVisible(n_active > 0)
        self.active_empty.setVisible(n_active == 0)
        self.disabled_table.setVisible(n_disabled > 0)
        self.disabled_empty.setVisible(n_disabled == 0)
        self._refresh_badges()
        self._suppress_table = False
        self._suppress_sel = False

        if select_index is not None and select_index in self._row_of_index:
            table, row = self._row_of_index[select_index]
            self._select_in(table, row)
        else:
            self._load_editor_from_selection()
        self._validate()

    def _section_html(self, title, n, miss, warn):
        base = f"{title}  ·  {n}"
        if miss:
            return f'{base}&nbsp;&nbsp;&nbsp;<span style="color:{BAD};">▲ {miss} broken</span>'
        if warn:
            return f'{base}&nbsp;&nbsp;&nbsp;<span style="color:{WARN};">▲ {warn} PATH-risk</span>'
        return base

    def _refresh_badges(self):
        n_a = n_d = a_miss = a_warn = d_miss = d_warn = 0
        a_names, d_names = [], []
        for s in self.servers:
            st = core.check_dependency(s.data)["status"]
            if s.enabled:
                n_a += 1
                if st == "missing":
                    a_miss += 1
                    a_names.append(s.name)
                elif st == "warn":
                    a_warn += 1
                    a_names.append(s.name)
            else:
                n_d += 1
                if st == "missing":
                    d_miss += 1
                    d_names.append(s.name)
                elif st == "warn":
                    d_warn += 1
                    d_names.append(s.name)
        self.active_label.setText(self._section_html("Active", n_a, a_miss, a_warn))
        self.active_label.setToolTip(("Needs attention: " + ", ".join(a_names)) if a_names else "")
        self.disabled_label.setText(self._section_html("⊘  Disabled", n_d, d_miss, d_warn))
        self.disabled_label.setToolTip(
            ("Needs attention: " + ", ".join(d_names)) if d_names else ""
        )

    def _select_in(self, table, row):
        self._suppress_sel = True
        other = self.disabled_table if table is self.active_table else self.active_table
        other.clearSelection()
        other.setCurrentCell(-1, -1)
        self._suppress_sel = False
        self._focused_table = table
        table.selectRow(row)  # fires _on_selection -> loads editor

    # --- selection across the two tables -------------------------------- #
    def _on_selection(self, table):
        if self._suppress_sel:
            return
        if table.currentRow() < 0:
            return
        self._suppress_sel = True
        other = self.disabled_table if table is self.active_table else self.active_table
        other.clearSelection()
        other.setCurrentCell(-1, -1)
        self._suppress_sel = False
        self._focused_table = table
        self._load_editor_from_selection()

    def _current_index(self) -> int:
        t = self._focused_table
        if t is None:
            return -1
        r = t.currentRow()
        if r < 0:
            return -1
        item = t.item(r, 1)
        if item is None:
            return -1
        idx = item.data(Qt.ItemDataRole.UserRole)
        return idx if idx is not None else -1

    def _load_editor_from_selection(self):
        idx = self._current_index()
        entry = self.servers[idx] if 0 <= idx < len(self.servers) else None
        self.editor.load_entry(entry)
        self.copy_btn.setEnabled(entry is not None and len(self.profiles) > 1)
        self.dup_btn.setEnabled(entry is not None)
        self.del_btn.setEnabled(entry is not None)

    def _table_item_changed(self, item: QTableWidgetItem):
        if self._suppress_table or item.column() != 0:
            return
        table = item.tableWidget()
        name_item = table.item(item.row(), 1)
        if name_item is None:
            return
        idx = name_item.data(Qt.ItemDataRole.UserRole)
        if idx is None or not (0 <= idx < len(self.servers)):
            return
        self._push_undo()
        self.servers[idx].enabled = item.checkState() == Qt.CheckState.Checked
        # Toggling moves the server to the other section; keep it selected there.
        self._refresh_tables(select_index=idx)
        self._mark_dirty()

    # --- editor change --------------------------------------------------- #
    def _editor_changed(self):
        idx = self._current_index()
        if not (0 <= idx < len(self.servers)):
            return
        entry = self.servers[idx]
        entry.name = self.editor.current_name()
        entry.data = self.editor.dump_data()
        # The server stays in its section (enable state unchanged), so update
        # its existing row in place rather than re-rendering.
        loc = self._row_of_index.get(idx)
        if loc:
            table, row = loc
            self._suppress_table = True
            table.item(row, 1).setText(entry.name)
            table.item(row, 2).setText("remote" if entry.kind == "remote" else "local")
            dep = core.check_dependency(entry.data)
            st = table.item(row, 3)
            st.setText(f"{STATUS_GLYPH.get(dep['status'], '○')}  {dep['label']}")
            st.setForeground(QColor(STATUS_COLORS.get(dep["status"], MUTED)))
            self._suppress_table = False
        self._refresh_badges()
        self._mark_dirty()

    # --- server actions -------------------------------------------------- #
    def add_server(self):
        self._push_undo()
        base = "new-server"
        name = base
        n = 2
        existing = {s.name for s in self.servers}
        while name in existing:
            name = f"{base}-{n}"
            n += 1
        self.servers.append(core.ServerEntry(name, {"command": "npx", "args": []}, True))
        self._refresh_tables(select_index=len(self.servers) - 1)
        self._mark_dirty()
        self.editor.name.setFocus()
        self.editor.name.selectAll()

    def duplicate_server(self):
        idx = self._current_index()
        if not (0 <= idx < len(self.servers)):
            return
        self._push_undo()
        src = self.servers[idx]
        existing = {s.name for s in self.servers}
        name = f"{src.name}-copy"
        n = 2
        while name in existing:
            name = f"{src.name}-copy-{n}"
            n += 1
        self.servers.insert(idx + 1, core.ServerEntry(name, dict(src.data), src.enabled))
        self._refresh_tables(select_index=idx + 1)
        self._mark_dirty()

    def delete_server(self):
        idx = self._current_index()
        if not (0 <= idx < len(self.servers)):
            return
        name = self.servers[idx].name
        if (
            QMessageBox.question(self, "Delete server", f"Remove “{name}”?")
            != QMessageBox.StandardButton.Yes
        ):
            return
        self._push_undo()
        del self.servers[idx]
        self._refresh_tables(select_index=min(idx, len(self.servers) - 1))
        self._mark_dirty()

    def paste_json(self):
        dlg = PasteDialog(self)
        if dlg.exec() != QDialog.DialogCode.Accepted or not dlg.result_servers:
            return
        self._push_undo()
        added, replaced = 0, 0
        existing = {s.name: i for i, s in enumerate(self.servers)}
        for name, data in dlg.result_servers.items():
            if name in existing:
                ans = QMessageBox.question(
                    self,
                    "Server exists",
                    f"“{name}” already exists. Replace it?\n\nYes = replace · No = keep both (renamed)",
                    QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No,
                )
                if ans == QMessageBox.StandardButton.Yes:
                    self.servers[existing[name]].data = data
                    replaced += 1
                    continue
                new = f"{name}-2"
                k = 3
                names = {s.name for s in self.servers}
                while new in names:
                    new = f"{name}-{k}"
                    k += 1
                name = new
            self.servers.append(core.ServerEntry(name, data, True))
            added += 1
        self._refresh_tables(select_index=len(self.servers) - 1)
        self._mark_dirty()
        self.status.setText(f"Imported {added} added, {replaced} replaced. Review and Save.")

    def copy_to_menu(self):
        idx = self._current_index()
        if not (0 <= idx < len(self.servers)):
            return
        menu = QMenu(self)
        for p in self.profiles:
            if self.current_profile and str(p.path) == str(self.current_profile.path):
                continue
            act = QAction(p.label, self)
            act.triggered.connect(lambda _=False, prof=p: self._copy_to(prof, idx))
            menu.addAction(act)
        if menu.isEmpty():
            return
        self.copy_btn.setMenu(menu)
        self.copy_btn.showMenu()

    def _copy_to(self, dest: core.Profile, idx: int):
        src = self.servers[idx]
        try:
            dest_cfg = core.load_config(dest.path)
        except Exception as e:
            QMessageBox.critical(self, "Copy failed", f"Couldn't read {dest.label}:\n{e}")
            return
        existing = core.extract_servers(dest_cfg)
        names = {s.name for s in existing}
        if src.name in names:
            ans = QMessageBox.question(
                self,
                "Exists in destination",
                f"“{src.name}” already exists in {dest.label}. Overwrite it there?",
            )
            if ans != QMessageBox.StandardButton.Yes:
                return
            existing = [s for s in existing if s.name != src.name]
        existing.append(core.ServerEntry(src.name, dict(src.data), True))
        core.apply_servers(dest_cfg, existing)
        try:
            backup = core.write_config(dest.path, dest_cfg)
        except Exception as e:
            QMessageBox.critical(self, "Copy failed", f"Couldn't write {dest.label}:\n{e}")
            return
        bnote = f" (backup: {backup.name})" if backup else ""
        self.status.setText(
            f"Copied “{src.name}” → {dest.label}{bnote}. Restart that Claude to apply."
        )

    # --- save ------------------------------------------------------------ #
    def _validate(self) -> bool:
        problems = core.validate_servers(self.servers)
        if problems:
            self.validation_lbl.setText(f"⚠ {problems[0]}")
            self.validation_lbl.setStyleSheet(f"color: {WARN};")
            self.save_btn.setEnabled(False)
            return False
        self.validation_lbl.setText("✓ valid")
        self.validation_lbl.setStyleSheet(f"color: {GOOD};")
        self.save_btn.setEnabled(self.dirty)
        return True

    def save(self):
        if not self.current_profile:
            return
        if not self._validate():
            QMessageBox.warning(self, "Can't save yet", "Fix the highlighted problem first.")
            return
        core.apply_servers(self.full_config, self.servers)
        try:
            backup = core.write_config(self.current_profile.path, self.full_config)
        except Exception as e:
            QMessageBox.critical(self, "Save failed", str(e))
            return
        self.current_profile.config_exists = True
        self.dirty = False
        self.save_btn.setEnabled(False)
        bnote = f"  ·  backup: {backup.name}" if backup else "  ·  (new file)"
        self.status.setText(
            f"Saved {self.current_profile.path}{bnote}  ·  Restart {self.current_profile.label} to apply."
        )

    # --- dirty / status -------------------------------------------------- #
    def _mark_dirty(self):
        self.dirty = True
        self._validate()
        self._update_status(saved=False)

    def _update_status(self, saved):
        if self.current_profile:
            n = len(self.servers)
            on = sum(1 for s in self.servers if s.enabled)
            d = " · unsaved changes" if self.dirty else ""
            self.status.setText(f"{self.current_profile.path}  ·  {on}/{n} enabled{d}")

    def _confirm_discard(self) -> bool:
        return (
            QMessageBox.question(
                self, "Discard changes?", "You have unsaved changes. Discard them?"
            )
            == QMessageBox.StandardButton.Yes
        )

    # --- drag & drop a .json file to import ------------------------------ #
    def dragEnterEvent(self, e):
        if e.mimeData().hasUrls() and any(
            u.toLocalFile().endswith(".json") for u in e.mimeData().urls()
        ):
            e.acceptProposedAction()

    def dropEvent(self, e):
        for u in e.mimeData().urls():
            path = u.toLocalFile()
            if not path.endswith(".json"):
                continue
            text = Path(path).read_text(encoding="utf-8")
            try:
                servers = core.parse_pasted_json(text)
            except Exception as ex:
                QMessageBox.warning(self, "Couldn't import", f"{Path(path).name}:\n{ex}")
                continue
            self._push_undo()
            for name, data in servers.items():
                names = {s.name for s in self.servers}
                if name in names:
                    name = f"{name}-imported"
                self.servers.append(core.ServerEntry(name, data, True))
            self._refresh_tables(select_index=len(self.servers) - 1)
            self._mark_dirty()
            self.status.setText(
                f"Imported {len(servers)} server(s) from {Path(path).name}. Review and Save."
            )
            break

    def closeEvent(self, e):
        if self.dirty and not self._confirm_discard():
            e.ignore()
            return
        self._save_layout()
        e.accept()


def main():
    app = QApplication(sys.argv)
    app.setApplicationName("Better Claude Config")
    app.setApplicationDisplayName("Better Claude Config")
    app.setStyleSheet(STYLESHEET)
    win = MainWindow()
    win.show()
    sys.exit(app.exec())


if __name__ == "__main__":
    main()