#############################################################################
##
## Copyright (C) 2022 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of The Qt Company Ltd nor the names of its
##     contributors may be used to endorse or promote products derived
##     from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

from PySide6.QtCore import QPoint, Qt, QCoreApplication, Slot
from PySide6.QtGui import QAction, QBrush, QPixmap, QColor, QPainter
from PySide6.QtWidgets import (QColorDialog, QComboBox, QDialog, QFontDialog,
                               QGroupBox, QHBoxLayout, QMainWindow, QLabel,
                               QLineEdit, QMessageBox, QPushButton, QToolBar,
                               QTableWidgetItem, QTableWidget, QVBoxLayout, QWidget)

from spreadsheetdelegate import SpreadSheetDelegate
from spreadsheetitem import SpreadSheetItem

from typing import Optional
from numbers import Number


class SpreadSheet(QMainWindow):
    def __init__(self, rows: Number, cols: Number, parent: Optional[QWidget] = None) -> None:
        super().__init__(parent)

        self._tool_bar = QToolBar(self)
        self._color_action = QAction()
        self._font_action = QAction()
        self._first_separator = QAction()
        self._cell_sum_action = QAction()
        self._cell_add_action = QAction()
        self._cell_sub_action = QAction()
        self._cell_mul_action = QAction()
        self._cell_div_action = QAction()
        self._second_separator = QAction()
        self._clear_action = QAction()
        self._about_spreadsheet = QAction()
        self._exit_action = QAction()

        # self._print_action = QAction()

        self._cell_label = QLabel(self._tool_bar)
        self._table = QTableWidget(rows, cols, self)
        self._formula_input = QLineEdit(self)

        self.addToolBar(self._tool_bar)

        self._cell_label.setMinimumSize(80, 0)

        self._tool_bar.addWidget(self._cell_label)
        self._tool_bar.addWidget(self._formula_input)

        self._table.setSizeAdjustPolicy(QTableWidget.SizeAdjustPolicy.AdjustToContents)
        for c in range(cols):
            character = chr(ord('A') + c)
            self._table.setHorizontalHeaderItem(c, QTableWidgetItem(character))

        self._table.setItemPrototype(self._table.item(rows - 1, cols - 1))
        self._table.setItemDelegate(SpreadSheetDelegate())

        self.create_actions()
        self.update_color(None)
        self.setup_menu_bar()
        self.setup_contents()
        self.setup_context_menu()
        self.setCentralWidget(self._table)

        self.statusBar()
        self._table.currentItemChanged.connect(self.update_status)
        self._table.currentItemChanged.connect(self.update_color)
        self._table.currentItemChanged.connect(self.update_line_edit)
        self._table.itemChanged.connect(self.update_status)
        self._formula_input.returnPressed.connect(self.return_pressed)
        self._table.itemChanged.connect(self.update_line_edit)

        self.setWindowTitle("Spreadsheet")

    def create_actions(self) -> None:
        self._cell_sum_action = QAction("Sum", self)
        self._cell_sum_action.triggered.connect(self.action_sum)

        self._cell_add_action = QAction("&Add", self)
        self._cell_add_action.setShortcut(Qt.CTRL | Qt.Key_Plus)
        self._cell_add_action.triggered.connect(self.action_add)

        self._cell_sub_action = QAction("&Subtract", self)
        self._cell_sub_action.setShortcut(Qt.CTRL | Qt.Key_Minus)
        self._cell_sub_action.triggered.connect(self.action_subtract)

        self._cell_mul_action = QAction("&Multiply", self)
        self._cell_mul_action.setShortcut(Qt.CTRL | Qt.Key_multiply)
        self._cell_mul_action.triggered.connect(self.action_multiply)

        self._cell_div_action = QAction("&Divide", self)
        self._cell_div_action.setShortcut(Qt.CTRL | Qt.Key_division)
        self._cell_div_action.triggered.connect(self.action_divide)

        self._font_action = QAction("Font...", self)
        self._font_action.setShortcut(Qt.CTRL | Qt.Key_F)
        self._font_action.triggered.connect(self.select_font)

        self._color_action = QAction(QPixmap(16, 16), "Background &Color...", self)
        self._color_action.triggered.connect(self.select_color)

        self._clear_action = QAction("Clear", self)
        self._clear_action.setShortcut(Qt.Key_Delete)
        self._clear_action.triggered.connect(self.clear)

        self._about_spreadsheet = QAction("About Spreadsheet", self)
        self._about_spreadsheet.triggered.connect(self.show_about)

        self._exit_action = QAction("E&xit", self)
        self._exit_action.triggered.connect(QCoreApplication.quit)

        self._first_separator = QAction(self)
        self._first_separator.setSeparator(True)

        self._second_separator = QAction(self)
        self._second_separator.setSeparator(True)

    def setup_menu_bar(self) -> None:
        file_menu = self.menuBar().addMenu("&File")
        # file_menu.addAction(self._print_action)
        file_menu.addAction(self._exit_action)

        cell_menu = self.menuBar().addMenu("&Cell")
        cell_menu.addAction(self._cell_add_action)
        cell_menu.addAction(self._cell_sub_action)
        cell_menu.addAction(self._cell_mul_action)
        cell_menu.addAction(self._cell_div_action)
        cell_menu.addAction(self._cell_sum_action)
        cell_menu.addSeparator()
        cell_menu.addAction(self._color_action)
        cell_menu.addAction(self._font_action)

        self.menuBar().addSeparator()

        about_menu = self.menuBar().addMenu("&Help")
        about_menu.addAction(self._about_spreadsheet)

    @Slot(QTableWidgetItem)
    def update_status(self, item: QTableWidgetItem) -> None:
        if item and item == self._table.currentItem():
            self.statusBar().showMessage(str(item.data(Qt.StatusTipRole)), 1000)
            self._cell_label.setText(
                "Cell: ({})".format(
                    SpreadSheetItem.encode_pos(self._table.row(item), self._table.column(item))
                )
            )

    @Slot(QTableWidgetItem)
    def update_color(self, item: QTableWidgetItem) -> None:
        pix = QPixmap(16, 16)
        col = QColor()
        if item:
            col = item.background().color()
        if not col.isValid():
            col = self.palette().base().color()

        pt = QPainter(pix)
        pt.fillRect(0, 0, 16, 16, col)

        lighter = col.lighter()
        pt.setPen(lighter)
        light_frame = [QPoint(0, 15), QPoint(0, 0), QPoint(15, 0)]
        pt.drawPolyline(light_frame)

        pt.setPen(col.darker())
        darkFrame = [QPoint(1, 15), QPoint(15, 15), QPoint(15, 1)]
        pt.drawPolyline(darkFrame)

        pt.end()

        self._color_action.setIcon(pix)

    @Slot(QTableWidgetItem)
    def update_line_edit(self, item: QTableWidgetItem) -> None:
        if item != self._table.currentItem():
            return
        if item:
            self._formula_input.setText(str(item.data(Qt.EditRole)))
        else:
            self._formula_input.clear()

    @Slot()
    def return_pressed(self) -> None:
        text = self._formula_input.text()
        row = self._table.currentRow()
        col = self._table.currentColumn()
        item = self._table.item(row, col)
        if not item:
            self._table.setItem(row, col, SpreadSheetItem(text))
        else:
            item.setData(Qt.EditRole, text)
        self._table.viewport().update()

    @Slot()
    def select_color(self) -> None:
        item = self._table.currentItem()
        col = item.background().color() if item else self._table.palette().base().color()
        col = QColorDialog.getColor(col, self)
        if not col.isValid():
            return

        selected = self._table.selectedItems()
        if not selected:
            return

        for i in selected:
            if i:
                i.setBackground(col)

        self.update_color(self._table.currentItem())

    @Slot()
    def select_font(self) -> None:
        selected = self._table.selectedItems()
        if not selected:
            return

        ok = False
        fnt = QFontDialog.getFont(ok, self.font(), self)

        if not ok:
            return
        for i in selected:
            if i:
                i.setFont(fnt)

    def run_input_dialog(self, title: str, c1Text: str, c2Text: str, opText: str,
                         outText: str, cell1: str, cell2: str, outCell: str) -> bool:
        rows, cols = [], []
        for c in range(self._table.columnCount()):
            cols.append(chr(ord('A') + c))
        for r in range(self._table.rowCount()):
            rows.append(str(1 + r))

        add_dialog = QDialog(self)
        add_dialog.setWindowTitle(title)

        group = QGroupBox(title, add_dialog)
        group.setMinimumSize(250, 100)

        cell1_label = QLabel(c1Text, group)
        cell1_row_input = QComboBox(group)
        c1_row, c1_col = SpreadSheetItem.decode_pos(cell1)
        cell1_row_input.addItems(rows)
        cell1_row_input.setCurrentIndex(c1_row)

        cell1_col_input = QComboBox(group)
        cell1_col_input.addItems(cols)
        cell1_col_input.setCurrentIndex(c1_col)

        operator_label = QLabel(opText, group)
        operator_label.setAlignment(Qt.AlignHCenter)

        cell2_label = QLabel(c2Text, group)
        cell2_row_input = QComboBox(group)
        c2_row, c2_col = SpreadSheetItem.decode_pos(cell2)
        cell2_row_input.addItems(rows)
        cell2_row_input.setCurrentIndex(c2_row)
        cell2_col_input = QComboBox(group)
        cell2_col_input.addItems(cols)
        cell2_col_input.setCurrentIndex(c2_col)

        equals_label = QLabel("=", group)
        equals_label.setAlignment(Qt.AlignHCenter)

        out_label = QLabel(outText, group)
        out_row_input = QComboBox(group)
        out_row, out_col = SpreadSheetItem.decode_pos(outCell)
        out_row_input.addItems(rows)
        out_row_input.setCurrentIndex(out_row)
        out_col_input = QComboBox(group)
        out_col_input.addItems(cols)
        out_col_input.setCurrentIndex(out_col)

        cancel_button = QPushButton("Cancel", add_dialog)
        cancel_button.clicked.connect(add_dialog.reject)

        ok_button = QPushButton("OK", add_dialog)
        ok_button.setDefault(True)
        ok_button.clicked.connect(add_dialog.accept)

        buttons_layout = QHBoxLayout()
        buttons_layout.addStretch(1)
        buttons_layout.addWidget(ok_button)
        buttons_layout.addSpacing(10)
        buttons_layout.addWidget(cancel_button)

        dialog_layout = QVBoxLayout(add_dialog)
        dialog_layout.addWidget(group)
        dialog_layout.addStretch(1)
        dialog_layout.addItem(buttons_layout)

        cell1_layout = QHBoxLayout()
        cell1_layout.addWidget(cell1_label)
        cell1_layout.addSpacing(10)
        cell1_layout.addWidget(cell1_col_input)
        cell1_layout.addSpacing(10)
        cell1_layout.addWidget(cell1_row_input)

        cell2_layout = QHBoxLayout()
        cell2_layout.addWidget(cell2_label)
        cell2_layout.addSpacing(10)
        cell2_layout.addWidget(cell2_col_input)
        cell2_layout.addSpacing(10)
        cell2_layout.addWidget(cell2_row_input)

        out_layout = QHBoxLayout()
        out_layout.addWidget(out_label)
        out_layout.addSpacing(10)
        out_layout.addWidget(out_col_input)
        out_layout.addSpacing(10)
        out_layout.addWidget(out_row_input)

        v_layout = QVBoxLayout(group)
        v_layout.addItem(cell1_layout)
        v_layout.addWidget(operator_label)
        v_layout.addItem(cell2_layout)
        v_layout.addWidget(equals_label)
        v_layout.addStretch(1)
        v_layout.addItem(out_layout)

        if add_dialog.exec():
            cell1 = cell1_col_input.currentText() + cell1_row_input.currentText()
            cell2 = cell2_col_input.currentText() + cell2_row_input.currentText()
            outCell = out_col_input.currentText() + out_row_input.currentText()
            return True

        return False

    @Slot()
    def action_sum(self) -> None:
        row_first = row_last = row_cur = 0
        col_first = col_last = col_cur = 0

        selected = self._table.selectedItems()

        if selected is not None:
            first = selected[0]
            last = selected[-1]
            row_first = self._table.row(first)
            row_last = self._table.row(last)
            col_first = self._table.column(first)
            col_last = self._table.column(last)

        current = self._table.currentItem()

        if current:
            row_cur = self._table.row(current)
            col_cur = self._table.column(current)

        cell1 = SpreadSheetItem.encode_pos(row_first, col_first)
        cell2 = SpreadSheetItem.encode_pos(row_last, col_last)
        out = SpreadSheetItem.encode_pos(row_cur, col_cur)

        if self.run_input_dialog(
            "Sum cells", "First cell:", "Last cell:",
            f"{(chr(0x03a3))}", "Output to:",
            cell1, cell2, out
        ):
            row, col = SpreadSheetItem.decode_pos(out)
            self._table.item(row, col).setText(f"sum {cell1} {cell2}")

    def action_math_helper(self, title: str, op: str) -> None:
        cell1 = "C1"
        cell2 = "C2"
        out = "C3"

        current = self._table.currentItem()
        if current:
            out = SpreadSheetItem.encode_pos(self._table.currentRow(), self._table.currentColumn())

        if self.run_input_dialog(title, "Cell 1", "Cell 2", op, "Output to:", cell1, cell2, out):
            row, col = SpreadSheetItem.decode_pos(out)
            self._table.item(row, col).setText(f"{op} {cell1} {cell2}")

    @Slot()
    def action_add(self) -> None:
        self.action_math_helper("Addition", "+")

    @Slot()
    def action_subtract(self) -> None:
        self.action_math_helper("Subtraction", "-")

    @Slot()
    def action_multiply(self) -> None:
        self.action_math_helper("Multiplication", "*")

    @Slot()
    def action_divide(self) -> None:
        self.action_math_helper("Division", "/")

    @Slot()
    def clear(self) -> None:
        selected_items = self._table.selectedItems()
        for item in selected_items:
            item.setText("")

    def setup_context_menu(self) -> None:
        self.addAction(self._cell_add_action)
        self.addAction(self._cell_sub_action)
        self.addAction(self._cell_mul_action)
        self.addAction(self._cell_div_action)
        self.addAction(self._cell_sum_action)
        self.addAction(self._first_separator)
        self.addAction(self._color_action)
        self.addAction(self._font_action)
        self.addAction(self._second_separator)
        self.addAction(self._clear_action)
        self.setContextMenuPolicy(Qt.ActionsContextMenu)

    def setup_contents(self) -> None:
        title_background = QBrush(Qt.lightGray)
        title_font = self._table.font()
        title_font.setBold(True)

        # column 0
        self._table.setItem(0, 0, SpreadSheetItem("Item"))
        self._table.item(0, 0).setBackground(title_background)
        self._table.item(0, 0).setToolTip(
            "This column shows the purchased item/service"
        )
        self._table.item(0, 0).setFont(title_font)

        self._table.setItem(1, 0, SpreadSheetItem("AirportBus"))
        self._table.setItem(2, 0, SpreadSheetItem("Flight (Munich)"))
        self._table.setItem(3, 0, SpreadSheetItem("Lunch"))
        self._table.setItem(4, 0, SpreadSheetItem("Flight (LA)"))
        self._table.setItem(5, 0, SpreadSheetItem("Taxi"))
        self._table.setItem(6, 0, SpreadSheetItem("Dinner"))
        self._table.setItem(7, 0, SpreadSheetItem("Hotel"))
        self._table.setItem(8, 0, SpreadSheetItem("Flight (Oslo)"))
        self._table.setItem(9, 0, SpreadSheetItem("Total:"))

        self._table.item(9, 0).setFont(title_font)
        self._table.item(9, 0).setBackground(title_background)

        # column 1
        self._table.setItem(0, 1, SpreadSheetItem("Date"))
        self._table.item(0, 1).setBackground(title_background)
        self._table.item(0, 1).setToolTip(
            "This column shows the purchase date, double click to change"
        )
        self._table.item(0, 1).setFont(title_font)

        self._table.setItem(1, 1, SpreadSheetItem("15/6/2006"))
        self._table.setItem(2, 1, SpreadSheetItem("15/6/2006"))
        self._table.setItem(3, 1, SpreadSheetItem("15/6/2006"))
        self._table.setItem(4, 1, SpreadSheetItem("21/5/2006"))
        self._table.setItem(5, 1, SpreadSheetItem("16/6/2006"))
        self._table.setItem(6, 1, SpreadSheetItem("16/6/2006"))
        self._table.setItem(7, 1, SpreadSheetItem("16/6/2006"))
        self._table.setItem(8, 1, SpreadSheetItem("18/6/2006"))

        self._table.setItem(9, 1, SpreadSheetItem())
        self._table.item(9, 1).setBackground(title_background)

        # column 2
        self._table.setItem(0, 2, SpreadSheetItem("Price"))
        self._table.item(0, 2).setBackground(title_background)
        self._table.item(0, 2).setToolTip("This column shows the price of the purchase")
        self._table.item(0, 2).setFont(title_font)

        self._table.setItem(1, 2, SpreadSheetItem("150"))
        self._table.setItem(2, 2, SpreadSheetItem("2350"))
        self._table.setItem(3, 2, SpreadSheetItem("-14"))
        self._table.setItem(4, 2, SpreadSheetItem("980"))
        self._table.setItem(5, 2, SpreadSheetItem("5"))
        self._table.setItem(6, 2, SpreadSheetItem("120"))
        self._table.setItem(7, 2, SpreadSheetItem("300"))
        self._table.setItem(8, 2, SpreadSheetItem("1240"))

        self._table.setItem(9, 2, SpreadSheetItem())
        self._table.item(9, 2).setBackground(Qt.lightGray)

        # column 3
        self._table.setItem(0, 3, SpreadSheetItem("Currency"))
        self._table.item(0, 3).setBackground(title_background)
        self._table.item(0, 3).setToolTip("This column shows the currency")
        self._table.item(0, 3).setFont(title_font)

        self._table.setItem(1, 3, SpreadSheetItem("NOK"))
        self._table.setItem(2, 3, SpreadSheetItem("NOK"))
        self._table.setItem(3, 3, SpreadSheetItem("EUR"))
        self._table.setItem(4, 3, SpreadSheetItem("EUR"))
        self._table.setItem(5, 3, SpreadSheetItem("USD"))
        self._table.setItem(6, 3, SpreadSheetItem("USD"))
        self._table.setItem(7, 3, SpreadSheetItem("USD"))
        self._table.setItem(8, 3, SpreadSheetItem("USD"))

        self._table.setItem(9, 3, SpreadSheetItem())
        self._table.item(9, 3).setBackground(Qt.lightGray)

        # column 4
        self._table.setItem(0, 4, SpreadSheetItem("Ex. Rate"))
        self._table.item(0, 4).setBackground(title_background)
        self._table.item(0, 4).setToolTip("This column shows the exchange rate to NOK")
        self._table.item(0, 4).setFont(title_font)

        self._table.setItem(1, 4, SpreadSheetItem("1"))
        self._table.setItem(2, 4, SpreadSheetItem("1"))
        self._table.setItem(3, 4, SpreadSheetItem("8"))
        self._table.setItem(4, 4, SpreadSheetItem("8"))
        self._table.setItem(5, 4, SpreadSheetItem("7"))
        self._table.setItem(6, 4, SpreadSheetItem("7"))
        self._table.setItem(7, 4, SpreadSheetItem("7"))
        self._table.setItem(8, 4, SpreadSheetItem("7"))

        self._table.setItem(9, 4, SpreadSheetItem())
        self._table.item(9, 4).setBackground(title_background)

        # column 5
        self._table.setItem(0, 5, SpreadSheetItem("NOK"))
        self._table.item(0, 5).setBackground(title_background)
        self._table.item(0, 5).setToolTip("This column shows the expenses in NOK")
        self._table.item(0, 5).setFont(title_font)

        self._table.setItem(1, 5, SpreadSheetItem("* C2 E2"))
        self._table.setItem(2, 5, SpreadSheetItem("* C3 E3"))
        self._table.setItem(3, 5, SpreadSheetItem("* C4 E4"))
        self._table.setItem(4, 5, SpreadSheetItem("* C5 E5"))
        self._table.setItem(5, 5, SpreadSheetItem("* C6 E6"))
        self._table.setItem(6, 5, SpreadSheetItem("* C7 E7"))
        self._table.setItem(7, 5, SpreadSheetItem("* C8 E8"))
        self._table.setItem(8, 5, SpreadSheetItem("* C9 E9"))

        self._table.setItem(9, 5, SpreadSheetItem("sum F2 F9"))
        self._table.item(9, 5).setBackground(title_background)

    @Slot()
    def show_about(self) -> None:
        html_text = (
            "<HTML>"
            "<p><b>This demo shows use of <c>QTableWidget</c> with custom handling for"
            " individual cells.</b></p>"
            "<p>Using a customized table item we make it possible to have dynamic"
            " output in different cells. The content that is implemented for this"
            " particular demo is:"
            "<ul>"
            "<li>Adding two cells.</li>"
            "<li>Subtracting one cell from another.</li>"
            "<li>Multiplying two cells.</li>"
            "<li>Dividing one cell with another.</li>"
            "<li>Summing the contents of an arbitrary number of cells.</li>"
            "</HTML>")
        QMessageBox.about(self, "About Spreadsheet", html_text)
