"""Panneau lateral de vignettes des pages — V2."""

from PyQt6.QtWidgets import (QWidget, QVBoxLayout, QListWidget, QListWidgetItem,
                              QAbstractItemView, QMenu, QSizePolicy)
from PyQt6.QtGui import QIcon, QPixmap
from PyQt6.QtCore import Qt, pyqtSignal, QSize


class PagePanel(QWidget):
    """Panneau de vignettes avec drag & drop, suppression, insertion."""

    page_selected = pyqtSignal(int)        # page index cliquee
    pages_reordered = pyqtSignal(list)      # nouvelle liste d'indices
    page_delete_requested = pyqtSignal(int) # demande suppression
    page_insert_requested = pyqtSignal(int) # demande insertion page blanche apres

    def __init__(self, parent=None):
        super().__init__(parent)
        self.setMinimumWidth(100)
        self.setSizePolicy(QSizePolicy.Policy.Preferred, QSizePolicy.Policy.Expanding)
        self._setup_ui()

    def _setup_ui(self):
        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)

        self._list = QListWidget()
        self._list.setIconSize(QSize(120, 170))
        self._list.setSpacing(4)
        self._list.setStyleSheet("""
            QListWidget {
                background: #181825;
                border: none;
                border-right: 1px solid #313244;
                padding: 4px;
            }
            QListWidget::item {
                background: #1e1e2e;
                border: 1px solid #313244;
                border-radius: 6px;
                padding: 4px;
                color: #a6adc8;
                font-size: 10px;
                margin: 2px 0;
            }
            QListWidget::item:hover {
                background: #313244;
                border-color: #45475a;
            }
            QListWidget::item:selected {
                background: #313244;
                border: 1px solid #89b4fa;
                color: #cdd6f4;
            }
        """)

        self._list.setDragDropMode(QAbstractItemView.DragDropMode.InternalMove)
        self._list.setDefaultDropAction(Qt.DropAction.MoveAction)
        self._list.setContextMenuPolicy(Qt.ContextMenuPolicy.CustomContextMenu)
        self._list.customContextMenuRequested.connect(self._context_menu)
        self._list.currentRowChanged.connect(self._on_row_changed)
        self._list.model().rowsMoved.connect(self._on_rows_moved)

        layout.addWidget(self._list)

    def load_thumbnails(self, viewer):
        """Charger les miniatures depuis le viewer."""
        self._list.clear()
        for i in range(viewer.total_pages):
            thumb = viewer.get_page_thumbnail(i, 120)
            item = QListWidgetItem()
            item.setText(f"  Page {i + 1}")
            item.setData(Qt.ItemDataRole.UserRole, i)
            if thumb:
                item.setIcon(QIcon(thumb))
            self._list.addItem(item)

    def select_page(self, index):
        """Selectionner une page sans emettre le signal."""
        self._list.blockSignals(True)
        self._list.setCurrentRow(index)
        self._list.blockSignals(False)

    def _on_row_changed(self, row):
        if row >= 0:
            self.page_selected.emit(row)

    def _on_rows_moved(self):
        indices = []
        for i in range(self._list.count()):
            item = self._list.item(i)
            original_index = item.data(Qt.ItemDataRole.UserRole)
            indices.append(original_index)
        self.pages_reordered.emit(indices)

    def _context_menu(self, pos):
        item = self._list.itemAt(pos)
        if not item:
            return
        row = self._list.row(item)

        menu = QMenu(self)
        menu.setStyleSheet("""
            QMenu { background: #1e1e2e; color: #cdd6f4; border: 1px solid #45475a; border-radius: 8px; padding: 4px; }
            QMenu::item { padding: 6px 20px; border-radius: 4px; }
            QMenu::item:selected { background: #45475a; }
        """)

        act_insert = menu.addAction("Inserer une page blanche apres")
        act_delete = menu.addAction("Supprimer cette page")

        action = menu.exec(self._list.mapToGlobal(pos))
        if action == act_delete:
            self.page_delete_requested.emit(row)
        elif action == act_insert:
            self.page_insert_requested.emit(row)