import typing

import pandas as pd
from PyQt6.QtWidgets import QMainWindow, QTableView
from PyQt6 import uic, QtGui, QtCore
from PyQt6.QtCore import Qt

from banking_breakdown.ui.generated import Ui_MainWindow


class PandasModel(QtCore.QAbstractTableModel):
    def __init__(self, df: pd.DataFrame, parent=None):
        QtCore.QAbstractTableModel.__init__(self, parent)
        self._data = df

        self._horizontalHeaders = [''] * len(df.columns)

        for i, column in enumerate(df.columns):
            self.setHeaderData(i, Qt.Orientation.Horizontal, column)

    def setHeaderData(self, section, orientation, data,
                      role=Qt.ItemDataRole.EditRole):

        if ((orientation == Qt.Orientation.Horizontal)
                and ((role == Qt.ItemDataRole.DisplayRole)
                     or (role == Qt.ItemDataRole.EditRole))):

            self._horizontalHeaders[section] = data
            return True
        else:
            return super().setHeaderData(section, orientation, data, role)

    def headerData(self, section, orientation,
                   role=Qt.ItemDataRole.DisplayRole):

        if (orientation == Qt.Orientation.Horizontal
                and role == Qt.ItemDataRole.DisplayRole):

            return self._horizontalHeaders[section]
        else:
            return super().headerData(section, orientation, role)

    def rowCount(self, parent=None):
        return len(self._data.values)

    def columnCount(self, parent=None):
        return self._data.columns.size

    def data(self, index, role=Qt.ItemDataRole.DisplayRole):
        if not index.isValid():
            return QtCore.QVariant()
        if role != Qt.ItemDataRole.DisplayRole:
            return QtCore.QVariant()

        item = self._data.iloc[index.row()].iloc[index.column()]

        if type(item) is pd.Timestamp:
            return QtCore.QVariant(item.strftime('%Y-%m-%d'))
        else:
            return QtCore.QVariant(str(item))


class GeneratedWindowWrapper(QMainWindow):
    def __init__(self, ui_file: str, categories: typing.Sequence):
        super(GeneratedWindowWrapper, self).__init__()

        self._window = Ui_MainWindow()
        self._window.setupUi(self)

        # Set up window

        self._window.statementTableView.setSelectionBehavior(
            QTableView.SelectionBehavior.SelectRows)

        self._set_categories(categories)

    def _set_categories(self, categories: typing.Sequence[str]):
        model = QtGui.QStandardItemModel()
        self._window.categoryListView.setModel(model)

        for category in categories:
            item = QtGui.QStandardItem(category)
            model.appendRow(item)

    def set_statement_data(self, df: pd.DataFrame):
        model = PandasModel(df)
        self._window.statementTableView.setModel(model)