'''

'''

from PyQt5 import uic
from PyQt5.Qt import Qt, QEvent, QGraphicsScene, QPointF, QFileDialog, \
    QApplication, QMessageBox, QTreeWidgetItem, \
    QGraphicsTextItem
from PyQt5.QtWidgets import QMainWindow, QGraphicsView
from path import Path

import core


Ui_window, _ = uic.loadUiType(Path(__file__).parent / 'qt_viewer.ui')

class GraphicsObject(QGraphicsTextItem):
    def __init__(self, obj, parent=None, scene=None):
        self.obj = obj
        super(GraphicsObject, self).__init__("...", parent=parent)
        self.setHtml("<b>{}</b>".format(obj.nom))
        self.setTextWidth(200)


class Viewer(QMainWindow):

    def __init__(self):
        super (Viewer, self).__init__()
        self.createWidgets()

    # ## UI related methods
    def createWidgets(self):
        self.ui = Ui_window()
        self.ui.setupUi(self)

        self.ui.progressBar.setVisible(False)
        self.ui.stackedWidget.setCurrentIndex(0)

        self.ui.btn_select.clicked.connect(self.run)
        self.ui.btn_zoom_plus.clicked.connect(self.zoom_plus)
        self.ui.btn_zoom_minus.clicked.connect(self.zoom_minus)
        self.ui.btn_zoom_view.clicked.connect(self.fit_in_view)
        self.ui.treeWidget.itemClicked.connect(self.itemSelected)

        core.Analyse.report = self.update_progression

        self.ui.view.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)
        self.ui.view.setDragMode(QGraphicsView.NoDrag)
        self.ui.view.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
        self.ui.view.viewport().installEventFilter(self)

        self._scene = QGraphicsScene()
        self._scene.setItemIndexMethod(QGraphicsScene.BspTreeIndex)

        self.ui.view.setScene(self._scene)
        self.ui.view.centerOn(QPointF(0, 0))
        self.fit_in_view()


    def eventFilter(self, obj, event):
        if event.type() == QEvent.Wheel:
            if event.angleDelta().y() > 0:
                self.zoom_plus()
            elif event.angleDelta().y() < 0:
                self.zoom_minus()
            return True
        return False

    def fit_in_view(self):
        self.ui.view.fitInView(self._scene.sceneRect(), Qt.KeepAspectRatio)

    def zoom_plus(self):
        self.ui.view.scale(1.2, 1.2)

    def zoom_minus(self):
        self.ui.view.scale(0.8, 0.8)

    def update_progression(self, i, total, msg=""):
        self.ui.progressBar.setMaximum(total)
        self.ui.progressBar.setValue(i)
        if msg:
            self.ui.txtPanel.append(msg)
        QApplication.processEvents()

    def run(self):

#         source_dir = QFileDialog.getExistingDirectory(self, "Sélectionner le répertoire des sources", "", QFileDialog.ShowDirsOnly)
        source_dir = r"C:\dev\access\AGRHum\source"

        self.ui.progressBar.setVisible(True)
        self.ui.lbl_repertoire.setText(source_dir)
        self.ui.txtPanel.clear()
        self.ui.treeWidget.clear()

        QApplication.setOverrideCursor(Qt.WaitCursor)

        core.Analyse.run(source_dir)

        QApplication.restoreOverrideCursor()

        QMessageBox.information(self, "test", "{} objets chargés".format(len(core.Analyse.objects)))

        self.ui.progressBar.setVisible(False)
        self.ui.stackedWidget.setCurrentIndex(1)
        self.ui.txtPanel.clear()

        topitem = QTreeWidgetItem()
        topitem.setText(0, "Objets")
        self.ui.treeWidget.addTopLevelItem(topitem)
        groupes = {}

        for index, obj in enumerate(core.Analyse.objects):
            if not obj.type_ in groupes:
                item = QTreeWidgetItem()
                item.setText(0, obj.type_)
                groupes[obj.type_] = item
                topitem.addChild(item)

            item = QTreeWidgetItem()
            item.setText(0, obj.nom)
            item.setData(1, 0, index)
            groupes[obj.type_].addChild(item)

        self.ui.treeWidget.setColumnHidden(1, True)
        self.ui.treeWidget.expandToDepth(1)

    def itemSelected(self, item):
        index = item.data(1, 0)
        obj = core.Analyse.objects[index]

        go = GraphicsObject(obj)
        self._scene.addItem(go)