from typing import cast
from PySide6.QtCore import QAbstractItemModel, QDir, QEvent, QFile, QModelIndex, QObject, QPersistentModelIndex, QPoint, QRect, QSize, QUrl, Signal, Qt, Slot
from PySide6.QtGui import QColor, QFont, QMouseEvent, QPainter, QPalette, QShowEvent, QTextDocument
from PySide6.QtWidgets import QApplication, QSizePolicy, QStyle, QStyleOptionViewItem, QStyledItemDelegate, QTableView, QTextEdit, QWidget
from PySide6.QtNetwork import QNetworkAccessManager, QNetworkReply, QNetworkRequest

from pdfView import PDFViewer
class QStyleOptionViewItemInit(QStyleOptionViewItem):
    backgroundBrush: QColor
    rect: QRect
    widget: QWidget
    font: QFont
    text: str

class documentDelegate(QStyledItemDelegate):
    def initStyleOption(
        self,
        option: QStyleOptionViewItem,
        index: QModelIndex | QPersistentModelIndex,
        /,
    ) -> None:
        options = cast(QStyleOptionViewItemInit, option)
        super().initStyleOption(options, index)
        assert index.isValid() and isinstance(index, QModelIndex)
        if index.siblingAtColumn(6).data() == 0:
            options.backgroundBrush = QColor(0x444444)
        return

    def paint(
        self,
        painter: QPainter,
        option: QStyleOptionViewItem,
        index: QModelIndex | QPersistentModelIndex,
    ) -> None:
        options = cast(QStyleOptionViewItemInit, option)
        self.initStyleOption(options, index)
        painter.save()
        doc = QTextDocument()
        doc.setTextWidth(options.rect.width())
        doc.setHtml(options.text)
        options.text = ""
        options.widget.style().drawControl(
            QStyle.ControlElement.CE_ItemViewItem,
            options,
            painter,
        )
        painter.translate(options.rect.left(), options.rect.top())
        clip = QRect(0, 0, options.rect.width(), options.rect.height())
        doc.drawContents(painter, clip)
        painter.restore()
        return

    def sizeHint(
        self,
        option: QStyleOptionViewItem,
        index: QModelIndex | QPersistentModelIndex,
    ) -> QSize:
        options = cast(QStyleOptionViewItemInit, option)
        self.initStyleOption(options, index)
        doc = QTextDocument()
        doc.setTextWidth(options.rect.width())
        doc.setHtml(options.text)
        doc.setTextWidth(options.rect.width())
        return QSize(int(doc.idealWidth()), int(doc.size().height()))


class docketEntry(QTextEdit):
    def mousePressEvent(self, e: QMouseEvent) -> None:
        super().mousePressEvent(e)
        anchor = self.anchorAt(e.pos())
        print(f"self.size(): {self.size()}")
        if anchor:
            print(f"Anchors away: {anchor}")
            obj = self
            while not isinstance(obj, docketTableView) and obj is not None:
                obj = obj.parent()
            assert obj is not None
            index = obj.indexAt(obj.mapFromGlobal(self.mapToGlobal(e.pos())))
            obj.anchorSignal.emit(index, anchor)
        return
    
    def sizeHint(self) -> QSize:
        size = self.size()
        doc = QTextDocument()
        doc.setPlainText(self.document().toPlainText())
        doc.setTextWidth(size.width())
        docSize = doc.size()
        print(f"size: {size}, docSize: {docSize}")
        return QSize(size.width(), int(docSize.height()))


class docketTableView(QTableView):
    manager = QNetworkAccessManager()
    clickedEvent = Signal(QPoint)
    anchorSignal = Signal(QModelIndex, str)

    def __init__(self, parent: QWidget|None = None) -> None:
        super(docketTableView,self).__init__(parent)
        self.anchorSignal.connect(self.doAnchor)
        self.manager.finished.connect(self.getDone)
        return
    
    def setModel(self, model: QAbstractItemModel | None) -> None:
        assert model is not None
        super().setModel(model)
        self.model().modelReset.connect(self.modelReset)
        print("Setting Model")
        return
    @Slot(QNetworkReply) # type: ignore
    def getDone(self, reply:QNetworkReply) -> None:
        dest = QFile('.'+reply.url().path())
        dest.open(QFile.OpenModeFlag.WriteOnly)
        dest.write(reply.readAll())
        dest.close()
        reply.deleteLater()
        self.pdf = PDFViewer(self)
        self.pdf.load_pdf(dest)
        self.pdf.show()
        return
    
    @Slot(QModelIndex, str) # type: ignore
    def doAnchor(self, index: QModelIndex, anchor: str) -> None:
        url = QUrl(anchor)
        print(f"{index.row()}, {index.column()} -> {url.path()}")
        dirs = url.path().split('/')
        dirs.pop()
        dirs.pop(0)
        currentDir = QDir()
        path = '/'.join(dirs)
        currentDir.mkpath(path)
        if QDir('.'+url.path()).exists():
            file = QFile('.'+url.path())
            self.pdf = PDFViewer(self)
            self.pdf.load_pdf(file)
            self.pdf.show()
        else:
            self.manager.get(QNetworkRequest(url))
        return
    def modelReset(self) -> None:
        model = self.model()
        red = QPalette()
        red.setColor(QPalette.ColorRole.Base, Qt.GlobalColor.red)
        for row in range(0, model.rowCount()):
            index = model.index(row,1)
            widget = docketEntry()
            widget.setHtml(model.data(index,Qt.ItemDataRole.DisplayRole))
            widget.setAutoFillBackground(False)
            widget.setReadOnly(True)
            widget.setPalette(red)
            self.setIndexWidget(index, widget)
        return