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

from tools import trace, timer

from View.ASubWindow import ASubMainWindow
from View.ListedSubWindow import ListedSubWindow

from PyQt5.QtGui import (
    QKeySequence,
)

from PyQt5.QtCore import (
    Qt, QVariant, QAbstractTableModel,
    QCoreApplication, QModelIndex, pyqtSlot,
    QRect,
)

from PyQt5.QtWidgets import (
    QDialogButtonBox, QPushButton, QLineEdit,
    QFileDialog, QTableView, QAbstractItemView,
    QUndoStack, QShortcut, QAction, QItemDelegate,
    QComboBox,
)

from View.BoundaryCondition.BCUndoCommand import (
    SetNameCommand, SetNodeCommand, SetTypeCommand,
    AddCommand, DelCommand, SortCommand,
    MoveCommand, PasteCommand, DuplicateCommand,
)
from Model.BoundaryCondition.BoundaryConditionTypes import (
    NotDefined, PonctualContribution,
    TimeOverZ, TimeOverDebit, ZOverDebit
)
from View.BoundaryCondition.translate import long_types
from View.BoundaryCondition.Edit.Window import EditBoundaryConditionWindow

_translate = QCoreApplication.translate

table_headers = {
    "name": _translate("BoundaryCondition", "Name"),
    "type": _translate("BoundaryCondition", "Type"),
    "node": _translate("BoundaryCondition", "Node")
}

BC_types = {
    "ND": NotDefined,
    "PC": PonctualContribution,
    "TZ": TimeOverZ,
    "TD": TimeOverDebit,
    "ZD": ZOverDebit
}


class ComboBoxDelegate(QItemDelegate):
    def __init__(self, data=None, mode="type", parent=None):
        super(ComboBoxDelegate, self).__init__(parent)

        self._data = data
        self._mode = mode

    def createEditor(self, parent, option, index):
        self.editor = QComboBox(parent)

        if self._mode == "type":
            self.editor.addItems([long_types[k] for k in BC_types.keys()])
        else:
            self.editor.addItems(
                [_translate("BoundaryCondition", "Not associate")] +
                self._data.nodes_names()
            )

        self.editor.setCurrentText(index.data(Qt.DisplayRole))
        return self.editor

    def setEditorData(self, editor, index):
        value = index.data(Qt.DisplayRole)
        self.editor.currentTextChanged.connect(self.currentItemChanged)

    def setModelData(self, editor, model, index):
        text = str(editor.currentText())
        model.setData(index, text)
        editor.close()
        editor.deleteLater()

    def updateEditorGeometry(self, editor, option, index):
        r = QRect(option.rect)
        if self.editor.windowFlags() & Qt.Popup and editor.parent() is not None:
            r.setTopLeft(self.editor.parent().mapToGlobal(r.topLeft()))
        editor.setGeometry(r)

    @pyqtSlot()
    def currentItemChanged(self):
        self.commitData.emit(self.sender())


class TableModel(QAbstractTableModel):
    def __init__(self, data=None, undo=None):
        super(QAbstractTableModel, self).__init__()
        self._headers = list(table_headers.keys())
        self._data = data
        self._undo = undo
        self._lst = self._data.boundary_condition

    def flags(self, index):
        options = Qt.ItemIsEnabled | Qt.ItemIsSelectable
        options |= Qt.ItemIsEditable

        return options

    def rowCount(self, parent):
        return len(self._lst)

    def columnCount(self, parent):
        return len(self._headers)

    def data(self, index, role):
        if role != Qt.ItemDataRole.DisplayRole:
            return QVariant()

        row = index.row()
        column = index.column()

        if self._headers[column] == "name":
            return self._lst[row].name
        elif self._headers[column] == "type":
            t = self._lst[row].bctype
            return long_types[t]
        elif self._headers[column] == "node":
            n = self._lst[row].node
            if n is None:
                return _translate("BoundaryCondition", "Not associate")
            return n.name

        return QVariant()

    def headerData(self, section, orientation, role):
        if role == Qt.ItemDataRole.DisplayRole and orientation == Qt.Orientation.Horizontal:
            return table_headers[self._headers[section]]

        return QVariant()

    def setData(self, index, value, role=Qt.EditRole):
        if not index.isValid() or role != Qt.EditRole:
            return False

        row = index.row()
        column = index.column()

        if self._headers[column] == "name":
            self._undo.push(
                SetNameCommand(
                    self._lst, row, value
                )
            )
        elif self._headers[column] == "type":
            key = next(k for k, v in long_types.items() if v == value)
            self._undo.push(
                SetTypeCommand(
                    self._lst, row, BC_types[key]
                )
            )
        elif self._headers[column] == "node":
            self._undo.push(
                SetNodeCommand(
                    self._lst, row, self._data.node(value)
                )
            )

        self.dataChanged.emit(index, index)
        return True

    def add(self, row, parent=QModelIndex()):
        self.beginInsertRows(parent, row, row - 1)

        self._undo.push(
            AddCommand(
                self._lst, row
            )
        )

        self.endInsertRows()
        self.layoutChanged.emit()

    def delete(self, rows, parent=QModelIndex()):
        self.beginRemoveRows(parent, rows[0], rows[-1])

        self._undo.push(
            DelCommand(
                self._lst, rows
            )
        )

        self.endRemoveRows()

    def sort(self, _reverse, parent=QModelIndex()):
        self.layoutAboutToBeChanged.emit()

        self._undo.push(
            SortCommand(
                self._lst, False
            )
        )

        self.layoutAboutToBeChanged.emit()
        self.layoutChanged.emit()

    def move_up(self, row, parent=QModelIndex()):
        if row <= 0:
            return

        target = row + 2

        self.beginMoveRows(parent, row - 1, row - 1, parent, target)

        self._undo_stack.push(
            MoveCommand(
                self._lst, "up", row
            )
        )

        self.endMoveRows()
        self.layoutChanged.emit()

    def move_down(self, index, parent=QModelIndex()):
        if row > len(self._lst):
            return

        target = row

        self.beginMoveRows(parent, row + 1, row + 1, parent, target)

        self._undo_stack.push(
            MoveCommand(
                self._lst, "down", row
            )
        )

        self.endMoveRows()
        self.layoutChanged.emit()

    def undo(self):
        self._undo.undo()
        self.layoutChanged.emit()

    def redo(self):
        self._undo.redo()
        self.layoutChanged.emit()


class BoundaryConditionWindow(ASubMainWindow, ListedSubWindow):
    def __init__(self, title="BoundaryConditions", study=None, parent=None):
        super(BoundaryConditionWindow, self).__init__(
            name=title, ui="BoundaryConditions", parent=parent
        )

        self._study = study
        self._lst = self._study.river.boundary_condition

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

        self.ui.setWindowTitle(title)

    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):
        table = self.find(QTableView, "tableView")
        self._table = TableModel(
            data = self._study.river,
            undo = self._undo_stack
        )
        table.setModel(self._table)

        self._delegate_type = ComboBoxDelegate(
            data = self._study.river,
            mode = "type"
        )
        self._delegate_node = ComboBoxDelegate(
            data = self._study.river,
            mode = "node"
        )

        table.setItemDelegateForColumn(
            1, self._delegate_type
        )
        table.setItemDelegateForColumn(
            2, self._delegate_node
        )

        table.setSelectionBehavior(QAbstractItemView.SelectRows)
        table.setAlternatingRowColors(True)


    def setup_connections(self):
        self.find(QAction, "action_add").triggered.connect(self.add)
        self.find(QAction, "action_del").triggered.connect(self.delete)
        self.find(QAction, "action_edit").triggered.connect(self.edit)
        self.find(QAction, "action_sort").triggered.connect(self.sort)

        self.undo_sc.activated.connect(self.undo)
        self.redo_sc.activated.connect(self.redo)
        self.copy_sc.activated.connect(self.copy)
        self.paste_sc.activated.connect(self.paste)


    def index_selected_row(self):
        table = self.find(QTableView, "tableView")
        return table.selectionModel()\
                    .selectedRows()[0]\
                    .row()

    def index_selected_rows(self):
        table = self.find(QTableView, "tableView")
        return list(
            # Delete duplicate
            set(
                map(
                    lambda i: i.row(),
                    table.selectedIndexes()
                )
            )
        )

    def add(self):
        rows = self.index_selected_rows()
        if len(self._lst) == 0 or len(rows) == 0:
            self._table.add(0)
        else:
            self._table.add(rows[0])

    def delete(self):
        rows = self.index_selected_rows()
        if len(rows) == 0:
            return

        self._table.delete(rows)

    def sort(self):
        self._table.sort(False)

    def move_up(self):
        row = self.index_selected_row()
        self._table.move_up(row)

    def move_down(self):
        row = self.index_selected_row()
        self._table.move_down(row)


    def copy(self):
        print("TODO")

    def paste(self):
        print("TODO")

    def undo(self):
        self._table.undo()

    def redo(self):
        self._table.redo()

    def edit(self):
        rows = self.index_selected_rows()
        for row in rows:
            win = EditBoundaryConditionWindow(
                data=self._lst[row],
                parent=self
            )
            win.show()