'''

'''

from PyQt5 import uic
from PyQt5.Qt import Qt, QEvent, QGraphicsScene, QPointF, QFileDialog, \
    QApplication, QMessageBox, QTreeWidgetItem, \
    QGraphicsTextItem, QGraphicsItem, QGraphicsRectItem, \
    QBrush, QColor, QGraphicsLineItem, QLineF, \
    QPen, QPainter, QSvgGenerator, QSize, QRect, QGraphicsItemGroup
from PyQt5.QtWidgets import QMainWindow, QGraphicsView
from path import Path

from core import AccessObject
import core


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

palette = {
            "tables": QColor(240, 240, 20),
            "queries": QColor(210, 50, 210),
            "modules": QColor(220, 10, 33),
            "relations": QColor(122, 50, 209),
            "reports": QColor(25, 10, 220),
            "forms": QColor(10, 180, 220),
            "scripts": QColor(40, 220, 10),
          }

v_spacing = 120
cell_width = 150
cell_spacing = 25

class GraphicsObject(QGraphicsItemGroup):
    items = []
    def __init__(self, obj, parent=None):
        super(GraphicsObject, self).__init__(parent=parent)
        self.obj = obj
        self._text = "[{}]<br/><b>{}</b>".format(obj.type_, obj.nom)
        self.links = []
        self._x = 0
        self._y = 0

        self.setFlag(QGraphicsItem.ItemIsMovable, True)
        self.setFlag(QGraphicsItem.ItemIsSelectable, True)
        self.setFlag(QGraphicsItem.ItemIsFocusable, True)

        self.label = QGraphicsTextItem()
        self.label.setHtml(self._text)
        self.label.setTextWidth(cell_width)
        self.label.setZValue(2)
        self.addToGroup(self.label)

        pen = QPen(palette[self.obj.type_].darker(150))
        pen.setWidth(2)
        self.rect = QGraphicsRectItem(self.label.boundingRect())
        self.rect.setPen(pen)
        self.rect.setBrush(palette[self.obj.type_].lighter(150))
        self.rect.setZValue(0)
        self.addToGroup(self.rect)

        self.topAnchorCoords = ((self.boundingRect().topLeft().x() + self.boundingRect().topRight().x() / 2), self.boundingRect().topLeft().y())
        self.bottomAnchorCoords = ((self.boundingRect().topLeft().x() + self.boundingRect().topRight().x() / 2), self.boundingRect().bottomLeft().y())
        self.top_anchor = QGraphicsRectItem(self.topAnchorCoords[0] - 3, self.topAnchorCoords[1] - 3, 6, 6)
        self.bottom_anchor = QGraphicsRectItem(self.bottomAnchorCoords[0] - 3, self.bottomAnchorCoords[1] - 3, 6, 6)
        for anchor in (self.top_anchor, self.bottom_anchor):
            anchor.setBrush(QBrush(QColor(255, 153, 51)))
            anchor.setZValue(1)
            self.addToGroup(anchor)

        GraphicsObject.items.append(self)

    def topAnchorCenter(self):
        return self.mapToScene(QPointF(*self.topAnchorCoords))

    def bottomAnchorCenter(self):
        return self.mapToScene(QPointF(*self.bottomAnchorCoords))

    def update(self):
        if self.pos() is not QPointF(self._x, self._y):
            self.setPos(QPointF(self._x, self._y))
        for l in self.links:
            l.update()

    def paint(self, *args, **kwargs):
        super(GraphicsObject, self).paint(*args, **kwargs)
        self._x, self._y = self.pos().x(), self.pos().y()
        self.update()

class GraphicsRootObject(GraphicsObject):
    def __init__(self, obj, parent=None):
        super(GraphicsRootObject, self).__init__(obj, parent=parent)
        self.level = 0
        self.deps = []
        self.refs = []
        self._dep_emprise = 0
        self._ref_emprise = 0

    def xleft(self):
        return 0

#     def compute_coords(self):
#         return 0, 0

    def compute_coords(self):
        return (0.5 * self.emprise() - (cell_width / 2 + cell_spacing)), 0

    def emprise(self):
        return max([self.dep_emprise(), self.ref_emprise()])

    def dep_emprise(self):
        if not self._dep_emprise:
            self._dep_emprise = sum([d.dep_emprise() for d in self.deps]) if self.deps else (cell_width + 2 * cell_spacing)
        return self._dep_emprise

    def ref_emprise(self):
        if not self._ref_emprise:
            self._ref_emprise = sum([r.ref_emprise() for r in self.refs]) if self.refs else (cell_width + 2 * cell_spacing)
        return self._ref_emprise

class GraphicsDepObject(GraphicsObject):
    def __init__(self, obj, parentItem, parent=None):
        super(GraphicsDepObject, self).__init__(obj, parent=parent)
        self.deps = []
        self.parentItem = parentItem
        if parentItem:
            parentItem.deps.append(self)
        self.level = parentItem.level + 1
        self._dep_emprise = 0

    def xleft(self):
        x0 = sum([n.dep_emprise() for n in self.parentItem.deps[0:self.parentItem.deps.index(self)]])
        return self.parentItem.xleft() + x0

    def compute_coords(self):
        x0 = sum([n.dep_emprise() for n in self.parentItem.deps[0:self.parentItem.deps.index(self)]])
        x = self.parentItem.xleft() + (0.5 * self.dep_emprise() - (cell_width / 2 + cell_spacing)) + x0
        y = v_spacing * self.level
        return x, y

    def dep_emprise(self):
        if not self._dep_emprise:
            self._dep_emprise = sum([d.dep_emprise() for d in self.deps]) if self.deps else (cell_width + 2 * cell_spacing)
        return self._dep_emprise

class GraphicsRefObject(GraphicsObject):
    def __init__(self, obj, childItem, parent=None):
        super(GraphicsRefObject, self).__init__(obj, parent=parent)
        self.refs = []
        self.childItem = childItem
        if childItem:
            childItem.refs.append(self)
        self.level = childItem.level - 1
        self._ref_emprise = 0

    def xleft(self):
        x0 = sum([n.ref_emprise() for n in self.childItem.refs[0:self.childItem.refs.index(self)]])
        return self.childItem.xleft() + x0

    def compute_coords(self):
        x0 = sum([n.ref_emprise() for n in self.childItem.refs[0:self.childItem.refs.index(self)]])
        return self.childItem.xleft() + (0.5 * self.ref_emprise() - (cell_width / 2 + cell_spacing)) + x0, v_spacing * self.level

    def ref_emprise(self):
        if not self._ref_emprise:
            self._ref_emprise = sum([d.ref_emprise() for d in self.refs]) if self.refs else (cell_width + 2 * cell_spacing)
        return self._ref_emprise


class GraphicsLink(QGraphicsLineItem):
    items = []
    def __init__(self, topGraphicsObject, bottomGraphicsObject, parent=None):
        self.topGraphicsObject = topGraphicsObject
        self.topGraphicsObject.links.append(self)

        self.bottomGraphicsObject = bottomGraphicsObject
        self.bottomGraphicsObject.links.append(self)

        super(QGraphicsLineItem, self).__init__(parent=parent)
        self.update()

    def update(self):
        line = QLineF(self.mapToScene(self.topGraphicsObject.bottomAnchorCenter()), self.mapToScene(self.bottomGraphicsObject.topAnchorCenter()))
        self.setLine(line)

    def select(self, active):
        pen = QPen()
        if active:
            pen.setColor(QColor("blue"))
            pen.setWidth(2)
        else:
            pen.setColor(QColor("black"))
            pen.setWidth(1)
        self.setPen(pen)


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_test.clicked.connect(self.test)

        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.btn_save.clicked.connect(self.save_to_png)
        self.ui.treeWidget.itemClicked.connect(self.treeItemSelected)

        core.Analyse.report = self.update_progression

        self.ui.view.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)
        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.fit_in_view()

    def eventFilter(self, _, 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 save_to_png(self):
        fileName, _ = QFileDialog.getSaveFileName(self, "Save File", "", "Svg File (*.svg)")
        if not fileName:
            return
        gen = QSvgGenerator()
        gen.setFileName(fileName)
        gen.setSize(QSize(1000, 1000))
        gen.setViewBox(QRect(0, 0, 1000, 1000))
        gen.setTitle("SVG Generator Example Drawing")
        gen.setDescription("An SVG drawing created by the SVG Generator "
                                    "Example provided with Qt.")
        painter = QPainter(gen)
        self._scene.render(painter)
        painter.end()

    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)

        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 clear_scene(self):
        self._scene.clear()
        GraphicsObject.items = []

    def maj_scene_with(self, root_object):
        self.clear_scene()
        root = GraphicsRootObject(root_object)
        self._scene.addItem(root)

        def _addDeps(go):
            for dep in go.obj.deps:
                if dep in [go.obj for go in GraphicsObject.items]:
                    print("ref circulaire: {}".format(dep))
                    continue
                gdep = GraphicsDepObject(dep, go)
                self._scene.addItem(gdep)

                link = GraphicsLink(go, gdep)
                self._scene.addItem(link)
                if dep.deps:
                    _addDeps(gdep)
        _addDeps(root)

        def _addRefs(go):
            for ref in go.obj.refs:
                if ref in [go.obj for go in GraphicsObject.items]:
                    print("ref circulaire: {}".format(ref))
                    continue
                gref = GraphicsRefObject(ref, go)
                self._scene.addItem(gref)

                link = GraphicsLink(gref, go)
                self._scene.addItem(link)
                if ref.refs:
                    _addRefs(gref)
        _addRefs(root)

        for item in GraphicsObject.items:
            item._x, item._y = item.compute_coords()
            item.update()

        self.ui.btn_save.setEnabled(True)
        self.fit_in_view()

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

    def test(self):
        a = AccessObject("queries", "testA_", "")
        b = AccessObject("queries", "testB", "")
        c = AccessObject("tables", "testC", "")
        d = AccessObject("tables", "testD", "")
        e = AccessObject("modules", "testE", "")
        f = AccessObject("relations", "testF", "")
        g = AccessObject("reports", "testG", "")
        h = AccessObject("forms", "testH", "")
        i = AccessObject("scripts", "testI", "")

        j = AccessObject("reports", "testJ", "")
        k = AccessObject("forms", "testK", "")
        l = AccessObject("scripts", "testL", "")

        b.deps = [e, f, g]
        c.deps = [h, i]
        a.deps = [b, c, d]
        j.refs = [k, l]
        a.refs = [j]

        self.maj_scene_with(a)

    def keyPressEvent(self, e):
        if e.key() == Qt.Key_Control:
            self.ui.view.setDragMode(QGraphicsView.ScrollHandDrag)
            e.accept()

    def keyReleaseEvent(self, e):
        if e.key() == Qt.Key_Control:
            self.ui.view.setDragMode(QGraphicsView.RubberBandDrag)