import os

from PySide6.QtCore import Qt, QSortFilterProxyModel, QSize, Signal
from PySide6.QtWidgets import QTableView, QStyledItemDelegate, QHeaderView
from PySide6.QtGui import QStandardItemModel, QStandardItem, QIcon

from Kikka.KikkaConst import *
from Kikka.Utils.IconHelper import IconHelper


class IconPanelItem(QStandardItem):
    pass
    
    
class IconPanelModel(QStandardItemModel):
    def __init__(self):
        super().__init__()

    def flags(self, index):
        return Qt.ItemFlag.ItemIsSelectable | Qt.ItemFlag.ItemIsEnabled | Qt.ItemFlag.ItemIsDragEnabled


class IconPanelProxyModel(QSortFilterProxyModel):
    pass


class IconPanelStyledItemDelegate(QStyledItemDelegate):
    def __init__(self, parent=None):
        super().__init__(parent)

    def paint(self, painter, option, index):
        icon = index.data(Qt.ItemDataRole.DecorationRole)
        if icon:
            rect = option.rect
            icon.paint(painter, rect, Qt.AlignmentFlag.AlignCenter)

    def sizeHint(self, option, index):
        return QSize(64, 64)


class IconPanel(QTableView):
    SIGNAL_DROP = Signal(str)
    SIGNAL_DOUBLE_CLICK = Signal(object)
    
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setAcceptDrops(True)
        self.initGUI()
        
        self.emptyIcon = QIcon(os.path.join(RESOURCES_PATH, "icon1.svg"))
        self.doubleClicked.connect(self.onDoubleClick)

    def initGUI(self):
        self.setDragDropMode(QTableView.DragDropMode.InternalMove)
        self.setSelectionMode(QTableView.SelectionMode.SingleSelection)
        # self.setSelectionBehavior(QAbstractItemView.SelectItems)
        # self.setGridStyle(Qt.DotLine)
        self.setShowGrid(False)
        self.setHorizontalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
        # self.setVerticalScrollBarPolicy(Qt.ScrollBarPolicy.ScrollBarAlwaysOff)
        self.verticalHeader().setVisible(False)
        self.verticalHeader().setSectionResizeMode(QHeaderView.ResizeMode.Fixed)
        self.horizontalHeader().setVisible(False)
        self.horizontalHeader().setSectionResizeMode(QHeaderView.ResizeMode.Fixed)

    def setData(self, actions):
        self._model = IconPanelModel()
        self._items = []
        self._model.setColumnCount(4)
        for i, action in enumerate(actions):
            item = IconPanelItem()
            item.setText(action.name)
            
            icon_file = action.path
            icon = IconHelper().getIconByFile(icon_file)
            if icon is None:
                icon = self.emptyIcon
            item.setIcon(icon)
            item.setData(action)
            self._items.append(item)

        self._proxyModel = IconPanelProxyModel()
        self._proxyModel.setSourceModel(self._model)

        self.setModel(self._proxyModel)
        self.setItemDelegate(IconPanelStyledItemDelegate(self))
        self.updateView()
        IconHelper().saveCache()

    def updateView(self):
        columnCount = max(self.width() // 64, 3)
        rowCount = max(len(self._items) // 64, 3)
        self.setIconSize(QSize(64, 64))
        self.horizontalHeader().setDefaultSectionSize(72)
        self.verticalHeader().setDefaultSectionSize(72)

        self._model.clear()
        self._model.setColumnCount(columnCount)
        for i in range(columnCount):
            self.setColumnWidth(i, 64)
        for i in range(rowCount):
            self.setRowHeight(i, 64)

        for i, item in enumerate(self._items):
            self._model.setItem(i // columnCount, i % columnCount, item)
        
    def resizeEvent(self, event):
        super().resizeEvent(event)
        self.updateView()

    def dragEnterEvent(self, event):
        mimeData = event.mimeData()
        if mimeData.hasUrls():
            event.acceptProposedAction()
        else:
            event.ignore()

    def dragMoveEvent(self, event):
        mimeData = event.mimeData()
        if mimeData.hasUrls():
            event.acceptProposedAction()
        else:
            event.ignore()

    def dropEvent(self, event):
        mimeData = event.mimeData()
        if mimeData.hasUrls():
            for url in mimeData.urls():
                file_path = url.toLocalFile()
                self.SIGNAL_DROP.emit(file_path)
        event.acceptProposedAction()

    def onDoubleClick(self, index):
        if index.isValid():
            item = self._model.item(index.row(), index.column())
            action = item.data()
            self.SIGNAL_DOUBLE_CLICK.emit(action)
    
    def mousePressEvent(self, event):
        return super().mousePressEvent(event)