# Window.py -- Pamhyr
# Copyright (C) 2023  INRAE
#
# 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.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

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

from PyQt5.QtCore import QCoreApplication

from PyQt5.QtGui import (
    QKeySequence,
)

from PyQt5.QtCore import (
    Qt, QRect, QVariant, QAbstractTableModel, pyqtSlot, pyqtSignal,
    QEvent,
)

from PyQt5.QtWidgets import (
    QTableView, QItemDelegate, QComboBox, QLineEdit, QHBoxLayout, QSlider,
    QPushButton, QCheckBox, QStyledItemDelegate, QStyleOptionButton, QStyle,
    QApplication, QToolBar, QAction, QHeaderView, QAbstractItemView,
    QUndoStack, QShortcut,
)

from Model.River import RiverNode, RiverReach, River

from View.ASubWindow import ASubMainWindow
from View.Network.GraphWidget import GraphWidget
from View.Network.UndoCommand import *
from View.Network.translate import (
    table_headers_node, table_headers_edge,
    retranslate,
)
from View.Network.Table import (
    ComboBoxDelegate, NodeTableModel, EdgeTableModel,
)

_translate = QCoreApplication.translate


class NetworkWindow(ASubMainWindow):
    def __init__(self, model=None, title="River network", parent=None):
        self._title = title
        self._model = model
        self._graph = self._model.river

        self.setup_title()

        super(NetworkWindow, self).__init__(
            name=title, ui="Network", parent=parent
        )
        self.ui.setWindowTitle(self._title)

        self.setup_sc()
        self.setup_graph()
        self.setup_table()
        self.setup_connections()

    def setup_title(self):
        self._title = self._title + " - " + self._model.name

    def setup_sc(self):
        self._undo_stack = QUndoStack()

        self.undo_sc = QShortcut(QKeySequence.Undo, self)
        self.redo_sc = QShortcut(QKeySequence.Redo, self)

    def setup_table(self):
        retranslate()

        # Nodes table
        table = self.find(QTableView, "tableView_nodes")
        self._nodes_model = NodeTableModel(
            table_view = table,
            table_headers = table_headers_node,
            editable_headers = ["name"],
            data = self._graph,
            undo = self._undo_stack,
        )
        table.setModel(self._nodes_model)

        table.setSelectionBehavior(QAbstractItemView.SelectRows)
        table.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)

        # Edges table
        table = self.find(QTableView, "tableView_reachs")
        self.delegate_combobox = ComboBoxDelegate(
            graph = self._graph,
            parent = self,
        )

        self._reachs_model = EdgeTableModel(
            table_view = table,
            table_headers = table_headers_edge,
            editable_headers = ["name", "node1", "node2"],
            delegates = {
                "node1": self.delegate_combobox,
                "node2": self.delegate_combobox,
            },
            data = self._graph,
            undo = self._undo_stack,
        )
        table.setModel(self._reachs_model)
        table.setSelectionBehavior(QAbstractItemView.SelectRows)
        table.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
        #table.resizeColumnsToContents()

    def setup_graph(self):
        self._graph_widget = GraphWidget(
            self._graph, parent=self,
            undo = self._undo_stack
        )
        self._graph_layout = self.find(QHBoxLayout, "horizontalLayout_graph")
        self._graph_layout.addWidget(self._graph_widget)

    def setup_connections(self):
        self._nodes_model.dataChanged.connect(self._reachs_model.update)
        self._nodes_model.dataChanged.connect(self._graph_widget.rename_nodes)
        self._reachs_model.dataChanged.connect(self._graph_widget.display_update)
        self._reachs_model.dataChanged.connect(self._nodes_model.update)
        self._graph_widget.changeEdge.connect(self._reachs_model.update)
        self._graph_widget.changeNode.connect(self._nodes_model.update)

        self.find(QAction, "action_toolBar_add").setCheckable(True)
        self.find(QAction, "action_toolBar_add").triggered.connect(
            self.clicked_add
        )

        self.find(QAction, "action_toolBar_del").setCheckable(True)
        self.find(QAction, "action_toolBar_del").triggered.connect(
            self.clicked_del
        )

        self.undo_sc.activated.connect(self.undo)
        self.redo_sc.activated.connect(self.redo)

    def clicked_add(self):
        if self.get_action_checkable("action_toolBar_add"):
            self.set_action_checkable("action_toolBar_del", False)
            self._graph_widget.state("add")
        else:
            self._graph_widget.state("move")

    def clicked_del(self):
        if self.get_action_checkable("action_toolBar_del"):
            self.set_action_checkable("action_toolBar_add", False)
            self._graph_widget.state("del")
        else:
            self._graph_widget.state("move")

    def keyPressEvent(self, event):
        key = event.key()

        if key == Qt.Key_Escape:
            self._graph_widget.reset_selection

    def undo(self):
        self._undo_stack.undo()
        self._reachs_model.update()
        self._nodes_model.update()
        self._graph_widget.display_update()

    def redo(self):
        self._undo_stack.redo()
        self._reachs_model.update()
        self._nodes_model.update()
        self._graph_widget.display_update()