"""Keyboard Shortcuts reference dialog."""
from PyQt6.QtWidgets import (
    QDialog, QVBoxLayout, QTreeWidget, QTreeWidgetItem, QDialogButtonBox,
)
from PyQt6.QtCore import Qt
from PyQt6.QtGui import QFont

_SHORTCUTS = [
    ("SQL Editor", [
        ("F5 / Ctrl+Enter",   "Run query"),
        ("Ctrl+/",            "Toggle line comment"),
        ("Ctrl+Space",        "Force auto-complete"),
        ("Ctrl+F",            "Find in editor"),
        ("Ctrl+H",            "Find & Replace in editor"),
        ("Ctrl+Z / Ctrl+Y",   "Undo / Redo"),
        ("Ctrl+A",            "Select all"),
        ("Ctrl+O",            "Open SQL file"),
        ("Ctrl+S",            "Save SQL file"),
    ]),
    ("Navigation", [
        ("Ctrl+N",            "New connection"),
        ("Ctrl+T",            "New SQL tab"),
        ("Ctrl+W",            "Close current tab"),
        ("Ctrl+Tab",          "Next tab"),
    ]),
    ("Tools & Panels", [
        ("Ctrl+P",            "Process list"),
        ("Ctrl+U",            "User management"),
        ("Ctrl+Shift+H",      "Toggle query history"),
        ("Ctrl+L",            "View app logs"),
    ]),
    ("Table Viewer", [
        ("Ins",               "Add new row"),
        ("Delete",            "Delete selected row(s)"),
        ("Double-click",      "Edit row"),
    ]),
    ("General", [
        ("Ctrl+Q",            "Quit"),
    ]),
]


class ShortcutsDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Keyboard Shortcuts")
        self.setMinimumSize(500, 540)
        self.resize(540, 580)
        self._build_ui()

    def _build_ui(self):
        root = QVBoxLayout(self)
        root.setContentsMargins(12, 12, 12, 12)
        root.setSpacing(8)

        tree = QTreeWidget()
        tree.setColumnCount(2)
        tree.setHeaderLabels(["Shortcut", "Action"])
        tree.setRootIsDecorated(True)
        tree.setAlternatingRowColors(True)
        tree.setEditTriggers(QTreeWidget.EditTrigger.NoEditTriggers)
        tree.setSelectionMode(QTreeWidget.SelectionMode.NoSelection)
        tree.header().setStretchLastSection(True)
        tree.setIndentation(20)

        bold = QFont()
        bold.setBold(True)

        for category, items in _SHORTCUTS:
            cat_item = QTreeWidgetItem([category, ""])
            cat_item.setFont(0, bold)
            cat_item.setFlags(cat_item.flags() & ~Qt.ItemFlag.ItemIsSelectable)
            for key, desc in items:
                child = QTreeWidgetItem([key, desc])
                child.setTextAlignment(
                    0, Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignVCenter
                )
                cat_item.addChild(child)
            tree.addTopLevelItem(cat_item)
            cat_item.setExpanded(True)

        tree.resizeColumnToContents(0)
        tree.setColumnWidth(0, max(200, tree.columnWidth(0) + 20))
        root.addWidget(tree, 1)

        bb = QDialogButtonBox(QDialogButtonBox.StandardButton.Close)
        bb.rejected.connect(self.reject)
        root.addWidget(bb)