from typing import cast

from PySide6.QtCore import (
    QAbstractItemModel,
    QDir,
    QFile,
    QModelIndex,
    QObject,
    QPersistentModelIndex,
    QPoint,
    QSize,
    Qt,
    QUrl,
    Signal,
    Slot,
)
from PySide6.QtGui import (
    QMouseEvent,
    QPalette,
    QTextDocument,
)
from PySide6.QtNetwork import (
    QNetworkAccessManager,
    QNetworkReply,
    QNetworkRequest,
)
from PySide6.QtWidgets import (
    QAbstractItemView,
    QSizePolicy,
    QStyledItemDelegate,
    QStyleOptionViewItem,
    QTableView,
    QTextEdit,
    QWidget,
)

from pdfView import PDFViewer

class docketEntryDelegate(QStyledItemDelegate):
    def __init__(self, view: QAbstractItemView, parent: QWidget|None = None) -> None:
        super(docketEntryDelegate, self).__init__(parent)
        self.view = view
        return

    def sizeHint(self, _: QStyleOptionViewItem, index: QModelIndex | QPersistentModelIndex) -> QSize:
        widget = self.view.indexWidget(index)
        return widget.sizeHint()
    
class docketEntry(QTextEdit):
    def __init__(self, parent: QWidget|None = None) -> None:
        super(docketEntry, self).__init__(parent)
        self.setSizePolicy(QSizePolicy.Policy.Preferred ,
                           QSizePolicy.Policy.Fixed)
        return
    
    def mousePressEvent(self, e: QMouseEvent) -> None:
        super().mousePressEvent(e)
        anchor = self.anchorAt(e.pos())
        if anchor:
            obj = cast(QObject, 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()
        return QSize(size.width(), int(docSize.height()))

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

    def __init__(self, parent: QWidget | None = None) -> None:
        super(docketTableView, self).__init__(parent)
        self.setItemDelegateForColumn(1,docketEntryDelegate(self))
        self.anchorSignal.connect(self.doAnchor)
        self.manager = QNetworkAccessManager()
        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)
        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.open(dest)
        self.pdf.show()
        return

    @Slot(QModelIndex, str)  # type: ignore
    def doAnchor(self, _: QModelIndex, anchor: str) -> None:
        url = QUrl(anchor)
        dirs = url.path().split("/")
        dirs.pop()
        dirs.pop(0)
        currentDir = QDir()
        path = "/".join(dirs)
        currentDir.mkpath(path)
        print(f"Checking for .{url.path()} existance.")
        if not hasattr(self, 'pdf'):
            self.pdf = PDFViewer(self)
        if QFile("." + url.path()).exists():
            self.pdf.open(QFile('.' + url.path()))
            self.pdf.show()
        else:
            print(f"Fetching {url}")
            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