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

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.Table import (
    GraphTableModel, ComboBoxDelegate, TrueFalseComboBoxDelegate,
)

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=self._title, ui="Network", parent=parent)
        self.ui.setWindowTitle(self._title)

        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)
        self.copy_sc = QShortcut(QKeySequence.Copy, self)
        self.paste_sc = QShortcut(QKeySequence.Paste, self)

    def setup_table(self):
        # Nodes table

        self.nodes_model = GraphTableModel(
            headers = ["name", "type"],
            graph = self._graph,
            rows_type = "nodes",
            undo = self._undo_stack,
        )
        table = self.find(QTableView, "tableView_nodes")
        table.setModel(self.nodes_model)
        #table.resizeColumnsToContents()

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

        # Edges table

        self.reachs_model = GraphTableModel(
            headers = ["name", "enable", "node1", "node2"],
            graph = self._graph,
            rows_type = "edges",
            undo = self._undo_stack,
        )
        self.delegate_combobox = ComboBoxDelegate(
            graph = self._graph,
            parent = self,
        )
        self.delegate_true_false_combobox = TrueFalseComboBoxDelegate(
            parent = self,
        )

        table = self.find(QTableView, "tableView_reachs")
        table.setModel(self.reachs_model)
        table.setItemDelegateForColumn(1, self.delegate_true_false_combobox)
        table.setItemDelegateForColumn(2, self.delegate_combobox)
        table.setItemDelegateForColumn(3, self.delegate_combobox)
        table.setSelectionBehavior(QAbstractItemView.SelectRows)
        table.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)
        #table.resizeColumnsToContents()

    def setup_graph(self):
        self._graph_widget = GraphWidget(self._graph, parent=self)
        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.find(QPushButton, "pushButton_reverse").clicked.connect(
            self.reverse_edge
        )


    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 reverse_edge(self):
        """Reverse edge direction of selected table rows

        Returns:
            Nothing
        """
        indices = self.find(QTableView, "tableView_reachs").selectionModel().selectedIndexes()
        indexes = {}

        for index in sorted(indices):
            indexes[index.row()] = index

        for row in indexes:
            self.reachs_model.reverse_edge(indexes[row])