# -*- coding: utf-8 -*-

##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2022 OpenLP Developers                              #
# ---------------------------------------------------------------------- #
# This program is free software: you can redistribute it and/or modify   #
# it under the terms of the GNU General Public License as published by   #
# the Free Software Foundation, either version 3 of the License, or      #
# (at your option) any later version.                                    #
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# This program is distributed in the hope that it will be useful,        #
# but WITHOUT ANY WARRANTY; without even the implied warranty of         #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          #
# GNU General Public License for more details.                           #
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# You should have received a copy of the GNU General Public License      #
# along with this program.  If not, see <https://www.gnu.org/licenses/>. #
##########################################################################
"""
The :mod:`formattingtagform` provides an Tag Edit facility. The Base set are protected and included each time loaded.
Custom tags can be defined and saved. The Custom Tag arrays are saved in a json string so QSettings works on them.
Base Tags cannot be changed.
"""
from PyQt5 import QtCore, QtWidgets

from openlp.core.common.i18n import translate
from openlp.core.lib.formattingtags import FormattingTags
from openlp.core.ui.formattingtagcontroller import FormattingTagController
from openlp.core.ui.formattingtagdialog import Ui_FormattingTagDialog


class EditColumn(object):
    """
    Hides the magic numbers for the table columns
    """
    Description = 0
    Tag = 1
    StartHtml = 2
    EndHtml = 3
    Hidden = 4


class FormattingTagForm(QtWidgets.QDialog, Ui_FormattingTagDialog, FormattingTagController):
    """
    The :class:`FormattingTagForm` manages the settings tab .
    """
    def __init__(self, parent):
        """
        Constructor
        """
        super(FormattingTagForm, self).__init__(parent, QtCore.Qt.WindowSystemMenuHint | QtCore.Qt.WindowTitleHint |
                                                QtCore.Qt.WindowCloseButtonHint)
        self.setup_ui(self)
        self._setup()

    def _setup(self):
        """
        Set up the class. This method is mocked out by the tests.
        """
        self.services = FormattingTagController()
        self.tag_table_widget.itemSelectionChanged.connect(self.on_row_selected)
        self.new_button.clicked.connect(self.on_new_clicked)
        self.delete_button.clicked.connect(self.on_delete_clicked)
        self.tag_table_widget.currentCellChanged.connect(self.on_current_cell_changed)
        self.button_box.rejected.connect(self.close)
        # Forces reloading of tags from openlp configuration.
        FormattingTags.load_tags()
        self.is_deleting = False
        self.reloading = False

    def exec(self):
        """
        Load Display and set field state.
        """
        # Create initial copy from master
        self._reloadTable()
        return QtWidgets.QDialog.exec(self)

    def on_row_selected(self):
        """
        Table Row selected so display items and set field state.
        """
        self.delete_button.setEnabled(True)

    def on_new_clicked(self):
        """
        Add a new tag to edit list and select it for editing.
        """
        new_row = self.tag_table_widget.rowCount()
        self.tag_table_widget.insertRow(new_row)
        self.tag_table_widget.setItem(new_row, 0,
                                      QtWidgets.QTableWidgetItem(translate('OpenLP.FormattingTagForm',
                                                                           'New Tag {row:d}').format(row=new_row)))
        self.tag_table_widget.setItem(new_row, 1, QtWidgets.QTableWidgetItem('n{row:d}'.format(row=new_row)))
        self.tag_table_widget.setItem(new_row, 2,
                                      QtWidgets.QTableWidgetItem(translate('OpenLP.FormattingTagForm', '<HTML here>')))
        self.tag_table_widget.setItem(new_row, 3, QtWidgets.QTableWidgetItem(''))
        hiddenwidget = QtWidgets.QWidget()
        hiddencheckbox = QtWidgets.QCheckBox()
        hiddenlayout = QtWidgets.QHBoxLayout()
        hiddenlayout.addWidget(hiddencheckbox)
        hiddenlayout.setAlignment(QtCore.Qt.AlignCenter)
        hiddenlayout.setContentsMargins(0, 0, 0, 0)
        hiddenwidget.setLayout(hiddenlayout)
        hiddencheckbox.setCheckState(QtCore.Qt.Unchecked)
        self.tag_table_widget.setCellWidget(new_row, 4, hiddenwidget)
        self.tag_table_widget.resizeRowsToContents()
        self.tag_table_widget.scrollToBottom()
        self.tag_table_widget.selectRow(new_row)

    def on_delete_clicked(self):
        """
        Delete selected custom row.
        """
        selected = self.tag_table_widget.currentRow()
        if selected != -1:
            self.is_deleting = True
            self.tag_table_widget.removeRow(selected)

    def accept(self):
        """
        Update Custom Tag details if not duplicate and save the data.
        """
        count = 0
        self.services.pre_save()
        while count < self.tag_table_widget.rowCount():
            error = self.services.validate_for_save(self.tag_table_widget.item(count, 0).text(),
                                                    self.tag_table_widget.item(count, 1).text(),
                                                    self.tag_table_widget.item(count, 2).text(),
                                                    self.tag_table_widget.item(count, 3).text(),
                                                    self.tag_table_widget.cellWidget(count, 4).children()[1].isChecked()
                                                    )
            if error:
                QtWidgets.QMessageBox.warning(self, translate('OpenLP.FormattingTagForm', 'Validation Error'), error)
                self.tag_table_widget.selectRow(count)
                return
            count += 1
        self.services.save_tags()
        QtWidgets.QDialog.accept(self)

    def _reloadTable(self):
        """
        Reset List for loading.
        """
        self.reloading = True
        self.tag_table_widget_read.clearContents()
        self.tag_table_widget_read.setRowCount(0)
        self.tag_table_widget.clearContents()
        self.tag_table_widget.setRowCount(0)
        self.new_button.setEnabled(True)
        self.delete_button.setEnabled(False)
        for line_number, html in enumerate(FormattingTags.get_html_tags()):
            if html['protected']:
                line = self.tag_table_widget_read.rowCount()
                self.tag_table_widget_read.setRowCount(line + 1)
                self.tag_table_widget_read.setItem(line, 0, QtWidgets.QTableWidgetItem(html['desc']))
                self.tag_table_widget_read.setItem(line, 1, QtWidgets.QTableWidgetItem(self._strip(html['start tag'])))
                self.tag_table_widget_read.setItem(line, 2, QtWidgets.QTableWidgetItem(html['start html']))
                self.tag_table_widget_read.setItem(line, 3, QtWidgets.QTableWidgetItem(html['end html']))
                self.tag_table_widget_read.resizeRowsToContents()
            else:
                line = self.tag_table_widget.rowCount()
                self.tag_table_widget.setRowCount(line + 1)
                self.tag_table_widget.setItem(line, 0, QtWidgets.QTableWidgetItem(html['desc']))
                self.tag_table_widget.setItem(line, 1, QtWidgets.QTableWidgetItem(self._strip(html['start tag'])))
                self.tag_table_widget.setItem(line, 2, QtWidgets.QTableWidgetItem(html['start html']))
                self.tag_table_widget.setItem(line, 3, QtWidgets.QTableWidgetItem(html['end html']))
                hiddenwidget = QtWidgets.QWidget()
                hiddencheckbox = QtWidgets.QCheckBox()
                hiddenlayout = QtWidgets.QHBoxLayout()
                hiddenlayout.addWidget(hiddencheckbox)
                hiddenlayout.setAlignment(QtCore.Qt.AlignCenter)
                hiddenlayout.setContentsMargins(0, 0, 0, 0)
                hiddenwidget.setLayout(hiddenlayout)
                hiddencheckbox.setCheckState(QtCore.Qt.Checked if html['hidden'] else QtCore.Qt.Unchecked)
                self.tag_table_widget.setCellWidget(line, 4, hiddenwidget)
                self.tag_table_widget.resizeRowsToContents()
                # Permanent (persistent) tags do not have this key
                html['temporary'] = False
        self.reloading = False

    def on_current_cell_changed(self, cur_row, cur_col, pre_row, pre_col):
        """
        This function processes all user edits in the table. It is called on each cell change.
        """
        if self.is_deleting:
            self.is_deleting = False
            return
        if self.reloading:
            return
        # only process for editable rows
        if self.tag_table_widget.item(pre_row, 0):
            item = self.tag_table_widget.item(pre_row, pre_col)
            if pre_col is not EditColumn.Hidden:
                text = item.text()
            errors = None
            if pre_col is EditColumn.Description:
                if not text:
                    errors = translate('OpenLP.FormattingTagForm', 'Description is missing')
            elif pre_col is EditColumn.Tag:
                if not text:
                    errors = translate('OpenLP.FormattingTagForm', 'Tag is missing')
            elif pre_col is EditColumn.StartHtml:
                # HTML edited
                item = self.tag_table_widget.item(pre_row, 3)
                end_html = item.text()
                errors, tag = self.services.start_tag_changed(text, end_html)
                if tag:
                    self.tag_table_widget.setItem(pre_row, 3, QtWidgets.QTableWidgetItem(tag))
                self.tag_table_widget.resizeRowsToContents()
            elif pre_col is EditColumn.EndHtml:
                # HTML edited
                item = self.tag_table_widget.item(pre_row, 2)
                start_html = item.text()
                errors, tag = self.services.end_tag_changed(start_html, text)
                if tag:
                    self.tag_table_widget.setItem(pre_row, 3, QtWidgets.QTableWidgetItem(tag))
            if errors:
                QtWidgets.QMessageBox.warning(self, translate('OpenLP.FormattingTagForm', 'Validation Error'), errors)
            self.tag_table_widget.resizeRowsToContents()
