# Copyright (C) 2013 Riverbank Computing Limited.
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations

import sys
from PySide6.QtCore import (QDate, QDateTime, QRegularExpression,
                            QSortFilterProxyModel, QTime, Qt, Slot)
from PySide6.QtGui import QStandardItemModel
from PySide6.QtWidgets import (QApplication, QCheckBox, QComboBox, QGridLayout,
                               QGroupBox, QHBoxLayout, QLabel, QLineEdit,
                               QTreeView, QVBoxLayout, QWidget)


REGULAR_EXPRESSION = 0
WILDCARD = 1
FIXED_STRING = 2


class Window(QWidget):
    def __init__(self):
        super().__init__()

        self._proxy_model = QSortFilterProxyModel()
        self._proxy_model.setDynamicSortFilter(True)

        self._source_group_box = QGroupBox("Original Model")
        self._proxy_group_box = QGroupBox("Sorted/Filtered Model")

        self._source_view = QTreeView()
        self._source_view.setRootIsDecorated(False)
        self._source_view.setAlternatingRowColors(True)

        self._proxy_view = QTreeView()
        self._proxy_view.setRootIsDecorated(False)
        self._proxy_view.setAlternatingRowColors(True)
        self._proxy_view.setModel(self._proxy_model)
        self._proxy_view.setSortingEnabled(True)

        self._sort_case_sensitivity_check_box = QCheckBox("Case sensitive sorting")
        self._filter_case_sensitivity_check_box = QCheckBox("Case sensitive filter")

        self._filter_pattern_line_edit = QLineEdit()
        self._filter_pattern_line_edit.setClearButtonEnabled(True)
        self._filter_pattern_label = QLabel("&Filter pattern:")
        self._filter_pattern_label.setBuddy(self._filter_pattern_line_edit)

        self._filter_syntax_combo_box = QComboBox()
        self._filter_syntax_combo_box.addItem("Regular expression",
                                              REGULAR_EXPRESSION)
        self._filter_syntax_combo_box.addItem("Wildcard",
                                              WILDCARD)
        self._filter_syntax_combo_box.addItem("Fixed string",
                                              FIXED_STRING)
        self._filter_syntax_label = QLabel("Filter &syntax:")
        self._filter_syntax_label.setBuddy(self._filter_syntax_combo_box)

        self._filter_column_combo_box = QComboBox()
        self._filter_column_combo_box.addItem("Subject")
        self._filter_column_combo_box.addItem("Sender")
        self._filter_column_combo_box.addItem("Date")
        self._filter_column_label = QLabel("Filter &column:")
        self._filter_column_label.setBuddy(self._filter_column_combo_box)

        self._filter_pattern_line_edit.textChanged.connect(self.filter_reg_exp_changed)
        self._filter_syntax_combo_box.currentIndexChanged.connect(self.filter_reg_exp_changed)
        self._filter_column_combo_box.currentIndexChanged.connect(self.filter_column_changed)
        self._filter_case_sensitivity_check_box.toggled.connect(self.filter_reg_exp_changed)
        self._sort_case_sensitivity_check_box.toggled.connect(self.sort_changed)

        source_layout = QHBoxLayout()
        source_layout.addWidget(self._source_view)
        self._source_group_box.setLayout(source_layout)

        proxy_layout = QGridLayout()
        proxy_layout.addWidget(self._proxy_view, 0, 0, 1, 3)
        proxy_layout.addWidget(self._filter_pattern_label, 1, 0)
        proxy_layout.addWidget(self._filter_pattern_line_edit, 1, 1, 1, 2)
        proxy_layout.addWidget(self._filter_syntax_label, 2, 0)
        proxy_layout.addWidget(self._filter_syntax_combo_box, 2, 1, 1, 2)
        proxy_layout.addWidget(self._filter_column_label, 3, 0)
        proxy_layout.addWidget(self._filter_column_combo_box, 3, 1, 1, 2)
        proxy_layout.addWidget(self._filter_case_sensitivity_check_box, 4, 0, 1, 2)
        proxy_layout.addWidget(self._sort_case_sensitivity_check_box, 4, 2)
        self._proxy_group_box.setLayout(proxy_layout)

        main_layout = QVBoxLayout()
        main_layout.addWidget(self._source_group_box)
        main_layout.addWidget(self._proxy_group_box)
        self.setLayout(main_layout)

        self.setWindowTitle("Basic Sort/Filter Model")
        self.resize(500, 450)

        self._proxy_view.sortByColumn(1, Qt.AscendingOrder)
        self._filter_column_combo_box.setCurrentIndex(1)

        self._filter_pattern_line_edit.setText("Andy|Grace")
        self._filter_case_sensitivity_check_box.setChecked(True)
        self._sort_case_sensitivity_check_box.setChecked(True)

    def set_source_model(self, model):
        self._proxy_model.setSourceModel(model)
        self._source_view.setModel(model)

    @Slot()
    def filter_reg_exp_changed(self):
        syntax_nr = self._filter_syntax_combo_box.currentData()
        pattern = self._filter_pattern_line_edit.text()
        if syntax_nr == WILDCARD:
            pattern = QRegularExpression.wildcardToRegularExpression(pattern)
        elif syntax_nr == FIXED_STRING:
            pattern = QRegularExpression.escape(pattern)

        reg_exp = QRegularExpression(pattern)
        if not self._filter_case_sensitivity_check_box.isChecked():
            options = reg_exp.patternOptions()
            options |= QRegularExpression.CaseInsensitiveOption
            reg_exp.setPatternOptions(options)
        self._proxy_model.setFilterRegularExpression(reg_exp)

    @Slot()
    def filter_column_changed(self):
        self._proxy_model.setFilterKeyColumn(self._filter_column_combo_box.currentIndex())

    @Slot()
    def sort_changed(self):
        if self._sort_case_sensitivity_check_box.isChecked():
            case_sensitivity = Qt.CaseSensitive
        else:
            case_sensitivity = Qt.CaseInsensitive

        self._proxy_model.setSortCaseSensitivity(case_sensitivity)


def add_mail(model, subject, sender, date):
    model.insertRow(0)
    model.setData(model.index(0, 0), subject)
    model.setData(model.index(0, 1), sender)
    model.setData(model.index(0, 2), date)


def create_mail_model(parent):
    model = QStandardItemModel(0, 3, parent)

    model.setHeaderData(0, Qt.Orientation.Horizontal, "Subject")
    model.setHeaderData(1, Qt.Orientation.Horizontal, "Sender")
    model.setHeaderData(2, Qt.Orientation.Horizontal, "Date")

    add_mail(model, "Happy New Year!", "Grace K. <grace@software-inc.com>",
             QDateTime(QDate(2006, 12, 31), QTime(17, 3)))
    add_mail(model, "Radically new concept", "Grace K. <grace@software-inc.com>",
             QDateTime(QDate(2006, 12, 22), QTime(9, 44)))
    add_mail(model, "Accounts", "pascale@nospam.com",
             QDateTime(QDate(2006, 12, 31), QTime(12, 50)))
    add_mail(model, "Expenses", "Joe Bloggs <joe@bloggs.com>",
             QDateTime(QDate(2006, 12, 25), QTime(11, 39)))
    add_mail(model, "Re: Expenses", "Andy <andy@nospam.com>",
             QDateTime(QDate(2007, 1, 2), QTime(16, 5)))
    add_mail(model, "Re: Accounts", "Joe Bloggs <joe@bloggs.com>",
             QDateTime(QDate(2007, 1, 3), QTime(14, 18)))
    add_mail(model, "Re: Accounts", "Andy <andy@nospam.com>",
             QDateTime(QDate(2007, 1, 3), QTime(14, 26)))
    add_mail(model, "Sports", "Linda Smith <linda.smith@nospam.com>",
             QDateTime(QDate(2007, 1, 5), QTime(11, 33)))
    add_mail(model, "AW: Sports", "Rolf Newschweinstein <rolfn@nospam.com>",
             QDateTime(QDate(2007, 1, 5), QTime(12, 0)))
    add_mail(model, "RE: Sports", "Petra Schmidt <petras@nospam.com>",
             QDateTime(QDate(2007, 1, 5), QTime(12, 1)))

    return model


if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = Window()
    window.set_source_model(create_mail_model(window))
    window.show()
    sys.exit(app.exec())
