#!/usr/bin/env python3

from birdvisu.annotations import AnnotatedTopology, AnnotatorID
from birdvisu.annotations.analysis import TopologyDifference, ShortestPathTree
from birdvisu.providers import BirdSocketTopologyProvider, OspfFileTopologyProvider, OspfFileParseError
from birdvisu.topo_v3 import TopologyV3, VertexID

from PySide6 import QtCore, QtGui, QtWidgets
from collections import defaultdict
from ipaddress import IPv4Address
from random import randint
import sys

app = QtWidgets.QApplication([])


class MyGraphicsRectItem(QtWidgets.QGraphicsRectItem):
	def __init__(self, nei, shapes, *a, **kwa):
		self.nei = nei
		self.shapes = shapes
		return super().__init__(*a, **kwa)
	#def itemChange(self, change, val):
	#       return super().itemChange(change, val)
	def mouseMoveEvent(self, evt):
		vtxid = self.data(0)
		for e in self.nei[vtxid]:
			x1 = self.x()
			y1 = self.y()
			other = e.source if e.source != vtxid else e.target
			x2 = self.shapes[other].x()
			y2 = self.shapes[other].y()
			qlinef = QtCore.QLineF(x1, y1, x2, y2)
			self.shapes[e].setLine(qlinef)
		return super().mouseMoveEvent(evt)

from enum import Enum, auto
from PySide6.QtCore import Slot
from birdvisu.ospfsock import BirdSocketConnection

class BirdTopologyLoader(QtWidgets.QDialog):
	def __init__(self, *a, **kwa):
		super().__init__(*a, **kwa)
		self.setModal(True)
		self.result_ = (None, None, None)
		outer = QtWidgets.QVBoxLayout(self)
		# Area
		inner = QtWidgets.QHBoxLayout()
		inner.addWidget(QtWidgets.QLabel('Area:'))
		line = QtWidgets.QLineEdit(self)
		line.setText('-1')
		self.line = line
		inner.addWidget(line)
		outer.addLayout(inner)

		inner = QtWidgets.QHBoxLayout()
		inner.addWidget(QtWidgets.QLabel('Instance:'))
		combo = QtWidgets.QComboBox()
		combo.addItems(self.get_instances())
		self.combo = combo
		inner.addWidget(combo)
		outer.addLayout(inner)

		inner = QtWidgets.QHBoxLayout()
		inner.addWidget(QtWidgets.QLabel('Protocol:'))
		combo = QtWidgets.QComboBox()
		combo.addItems(['Guess!', 'OSPFv2', 'OSPFv3'])
		self.combo2 = combo
		inner.addWidget(combo)
		outer.addLayout(inner)

		buttons = QtWidgets.QDialogButtonBox(QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel)
		buttons.accepted.connect(self.saveResult)
		buttons.accepted.connect(self.accept)
		buttons.rejected.connect(self.reject)
		outer.addWidget(buttons)

	@Slot()
	def saveResult(self):
		try:
			area = int(self.line.text())
		except ValueError:
			area = int(IPv4Address(self.line.text()))
		if area == -1: area = None
		inst = self.combo.currentText()
		proto = {
			'OSPFv2': 2,
			'OSPFv3': 3,
			'Guess!': None,
			}[self.combo2.currentText()]
		self.result_ = (area, inst, proto)
	
	def get_instances(self):
		# Our code is stupid, so we initialise a BirdSocketTopologyProvider just to get instances and then drop it.
		prov = BirdSocketTopologyProvider()
		bird = BirdSocketConnection()
		return prov.find_running_ospf(bird)


class MainWindow(QtWidgets.QMainWindow):
	class Tool(Enum):
		MoveTopology = auto()
		ShortestPath = auto()

	def __init__(self, *a, **kwa):
		super().__init__(*a, **kwa)
		self.ref_topo_provider = None
		self.cur_topo_provider = None
		self.annotators = self.get_annotators()
		self.annot_topo = None
		self.highlighter = None
		self.tool = self.Tool.MoveTopology
		self.scene = QtWidgets.QGraphicsScene()
		self.view = QtWidgets.QGraphicsView(self.scene)
		self.view.setDragMode(self.view.DragMode.ScrollHandDrag)
		self.setCentralWidget(self.view)
		self.statusbar = self.statusBar()
		self.statusbar.showMessage('Hello!')

		self.menubar = self.menuBar()
		mode_menu = self.menubar.addMenu('&Mode')
		short_path_act = QtGui.QAction("Sh. path &DAG", self)
		short_path_act.triggered.connect(self.shortestPathMode)
		mode_menu.addAction(short_path_act)

		topo_menu = self.menubar.addMenu('&Topology')
		open_ref_act = QtGui.QAction("&Load reference", self)
		open_ref_act.triggered.connect(self.openRefTopology)
		topo_menu.addAction(open_ref_act)

		cur_topo_menu = topo_menu.addMenu("Load &current")
		running_bird_act = QtGui.QAction('&BIRD', self)
		running_bird_act.triggered.connect(self.curTopologyFromBird)
		cur_topo_menu.addAction(running_bird_act)
		from_file_act = QtGui.QAction('&from file', self)
		from_file_act.triggered.connect(self.curTopologyFromFile)
		cur_topo_menu.addAction(from_file_act)

		refresh_act = QtGui.QAction("&Refresh", self)
		refresh_act.triggered.connect(self.refreshTopologies)
		topo_menu.addAction(refresh_act)

	def get_annotators(self):
		return [
			AnnotatorID(TopologyDifference),
			AnnotatorID(ShortestPathTree, (VertexID(
				family=None,
				is_router=True,
				address=None,
				router_id=int(IPv4Address('172.23.100.10')),
				dr_id=None,
				discriminator=None
				), 'current')),
			]

	@Slot()
	def shortestPathMode(self):
		self.tool = self.Tool.ShortestPath
	
	@Slot()
	def openRefTopology(self):
		filename = QtWidgets.QFileDialog.getOpenFileName(self, 'Open reference topology', '.', 'OSPF files(*.ospf);;All files(*)')[0]
		if filename == '': return # Do nothing
		self.ref_topo_provider = OspfFileTopologyProvider(filename)
		try:
			ref_topo = self.ref_topo_provider.get_topology()
		except OspfFileParseError as e:
			warning = QtWidgets.QMessageBox.critical(self, "Bad reference topology", f"The reference topology seems to be malformed: {e}.\nPlease select a valid reference topology.")
			self.ref_topo_provider = None
			return
		self.refreshTopologies()
		
	@Slot()
	def curTopologyFromBird(self):
		loader = BirdTopologyLoader(self)
		loader.exec()
		area, instance, version = loader.result_
		self.cur_topo_provider = BirdSocketTopologyProvider(instance=instance, area=area, version=version)
		try:
			cur_topo = self.cur_topo_provider.get_topology()
		except OspfFileParseError as e:
			warning = QtWidgets.QMessageBox.critical(self, "Bad current topology", f"The current topology seems to be malformed: {e}.\nPlease select a valid topology.")
			self.cur_topo_provider = None
			return
		self.refreshTopologies()

	@Slot()
	def curTopologyFromFile(self):
		filename = QtWidgets.QFileDialog.getOpenFileName(self, 'Open current topology', '.', 'OSPF files(*.ospf);;All files(*)')[0]
		if filename == '': return # Do nothing
		self.cur_topo_provider = OspfFileTopologyProvider(filename)
		try:
			cur_topo = self.cur_topo_provider.get_topology()
		except OspfFileParseError as e:
			warning = QtWidgets.QMessageBox.critical(self, "Bad current topology", f"The current topology seems to be malformed: {e}.\nPlease select a valid topology.")
			self.cur_topo_provider = None
			return
		self.refreshTopologies()

	@Slot()
	def refreshTopologies(self):
		# Pre-checks:
		msg = ''
		if self.ref_topo_provider is None: msg += 'Please select reference topology. '
		if self.cur_topo_provider is None: msg += 'Please select current topology. '
		if msg:
			self.statusbar.showMessage(msg)
			# Nothing more to do.
			return
		# We just drop anything we had before, since we will be re-reading all the files.
		try:
			ref_topo = self.ref_topo_provider.get_topology()
		except OspfFileParseError as e:
			warning = QtWidgets.QMessageBox.critical(self, "Bad reference topology", f"The reference topology seems to be malformed: {e}.\nPlease select a valid reference topology.")
			self.ref_topo_provider = None
			return
		try:
			cur_topo = self.cur_topo_provider.get_topology()
		except OspfFileParseError as e:
			warning = QtWidgets.QMessageBox.critical(self, "Bad current topology", f"The current topology seems to be malformed: {e}.\nPlease select a valid topology.")
			self.cur_topo_provider = None
			return
		self.scene.clear()
		combined_topology = TopologyV3.combine_topologies(reference=ref_topo, current=cur_topo)
		combined_topology.freeze()
		self.annot_topo = AnnotatedTopology(combined_topology)
		for ann_id in self.annotators:
			self.annot_topo.run_annotator(ann_id)
		# Draw it
		self.set_current_highlighter()
		self.ad_hoc_draw_visu()
	
	def set_current_highlighter(self):
		# TODO!
		self.highlighter = self.annotators[-1]
	
	def ad_hoc_draw_visu(self):
		shapes = dict()
		self.nei = defaultdict(lambda: [])
		for k, v in self.annot_topo.topology.vertices.items():
			size = 30 if k.is_router else 10
			x, y = randint(0, 1920), randint(0, 1080)
			shape = MyGraphicsRectItem(self.nei, shapes, -size/2, -size/2, size, size)
			shape.setPos(x,y)
			# TODO:brush
			label_text = str(IPv4Address(k.router_id)) if k.is_router else str(k.address) # Surprisingly works for all the possible addresses.
			label = QtWidgets.QGraphicsSimpleTextItem(label_text, parent=shape)
			label.setY(size*0.8)
			text_width = label.boundingRect().width()
			label.setX(-text_width/2)
			shape.setData(0, k)
			shape.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable | QtWidgets.QGraphicsItem.ItemIsSelectable)
			shapes[k] = shape

		for e in self.annot_topo.topology.edges:
			start = shapes[e.source].pos()
			end = shapes[e.target].pos()
			qlinef = QtCore.QLineF(start, end)
			line = QtWidgets.QGraphicsLineItem(qlinef)
			line.setData(0, e)
			self.nei[e.source].append(e)
			self.nei[e.target].append(e)
			shapes[e] = line
		if self.highlighter is not None and self.highlighter in self.annot_topo.annotations:
			ann = self.annot_topo.annotations[self.highlighter]
			for shk in ann.for_vertex.keys() | ann.for_edge.keys():
				shapes[shk].setPen(QtGui.QPen(QtGui.QColor('blue')))
			# FIXME: also color edges in opposite direction
		for sh in shapes.values(): self.scene.addItem(sh)

main_window = MainWindow()
main_window.show()
app.exec()