import numpy as np, scipy.optimize
import traceback
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

import phys, file

# global GUI-related shit
class GUI:
	table = None
	table_rows = list()
	monospace = QFont("monospace")
	bigfont = QFont("sans-serif", pointSize=10, weight=1000)

class Pens:
	axes = QPen(Qt.gray)

	ellipse = QPen(Qt.black)
	ellipse.setWidth(2)

	axis_linear = QPen(QColor(201, 141, 0))
	axis_linear.setWidth(2)
	axis_linear.setStyle(Qt.DashDotLine)

	axis_fast = QPen(QColor(51, 87, 123))
	axis_fast.setWidth(2)
	axis_fast.setStyle(Qt.DashDotLine)

	axis_slow = QPen(QColor(55, 123, 51))
	axis_slow.setWidth(2)
	axis_slow.setStyle(Qt.DashDotLine)

	alpha = QPen(Qt.red)
	theta = QPen(Qt.blue)

	radii = QPen(Qt.black)
	radii.setStyle(Qt.DashDotLine)

from ui_widgets import *



class OptBox(QVBoxLayout):
	def __init__(self, row, pol, rownum):
		super().__init__()

		# Name
		self.name = MeinGroßLabel("Element %d" % rownum)
		self.addWidget(self.name)

		# Type / Enable box
		self.hbox = QHBoxLayout()
		self.addLayout(self.hbox)

		# Type combo
		self.type = QComboBox()
		self.type.addItem("Linear", "linear",)
		self.type.addItem("Quarterwave plate", "quarterwave")
		self.type.setCurrentIndex(0 if pol.type == "linear" else 1)
		self.type.currentIndexChanged.connect(lambda : TableRow.type_change(row))
		self.hbox.addWidget(self.type)

		# Enable checkbox
		self.enable = QCheckBox("Enable")
		self.enable.setChecked(True)
		self.enable.stateChanged.connect(update)
		self.hbox.addWidget(self.enable)

		# Delta angle
		self.delta = AngleSlider("Delta")
		self.delta.setValue(pol.delta * 180 / np.pi)
		self.delta.on_change = lambda: TableRow.angle_change(row)
		self.addLayout(self.delta)

		# Angle reference
		self.ref = QComboBox()
		self.ref.addItem("Absolute", False)
		for i, _ in enumerate(system.elements):
			if i >= rownum - 1:
				continue
			self.ref.addItem("Relative to element #%d" % (i + 1), i)

			if row.ref is not False and i == row.ref:
				self.ref.setCurrentIndex(row.ref + 1)

		self.ref.currentIndexChanged.connect(update)
		self.addWidget(self.ref)

		# Angle
		self.angle = AngleSlider("Angle")
		self.angle.setValue(pol.angle * 180 / np.pi)
		self.angle.on_change = lambda: TableRow.angle_change(row)
		self.addLayout(self.angle)
		self.addItem(ExpandingSpacer())

		# Add
		self.add_above = QPushButton("Add above")
		self.add_above.clicked.connect(lambda: half_assed_element_creation(rownum - 1))
		self.add_below = QPushButton("Add below")
		self.add_below.clicked.connect(lambda: half_assed_element_creation(rownum))
		self.delete = QPushButton("Delete")
		self.delete.clicked.connect(lambda: half_assed_element_deletion(rownum - 1))

		self.buttons = QHBoxLayout()
		self.buttons.addWidget(self.add_above)
		self.buttons.addWidget(self.add_below)
		self.buttons.addWidget(self.delete)
		self.addLayout(self.buttons)



class TableRow:
	def __init__(self, pol, grid, rownum):
		self.pol = pol
		self.grid = grid
		self.rownum = rownum
		self.angle = pol.angle
		self.delta = pol.delta
		self.ref = pol.ref

		self.optbox = OptBox(self, pol, rownum)
		grid.addLayout(self.optbox, rownum, 1)

		self.ellipse = EllipseWidget(pol)
		grid.addWidget(self.ellipse, rownum, 2)

		self.info = QVBoxLayout()
		self.info_angle = MeinLabel()
		self.info_angle.setAlignment(Qt.AlignLeft)
		self.info.addWidget(self.info_angle)
		self.info.addWidget(QLabel("Polarization state"))
		self.info_jones = MeinLabel()
		self.info_jones.setAlignment(Qt.AlignLeft)
		self.info.addWidget(self.info_jones)
		self.info.addItem(ExpandingSpacer())
		grid.addLayout(self.info, rownum, 3)


	@staticmethod
	def angle_change(row):
		row.angle = row.optbox.angle.angle / 180 * np.pi
		row.delta = row.optbox.delta.angle / 180 * np.pi
		update()

	@staticmethod
	def type_change(row):
		row.pol.set_type(row.optbox.type.currentData())
		update()


def populate_table():
	GUI.table = QGridLayout()
	GUI.table.setColumnStretch(1, 1)
	GUI.table.setColumnStretch(2, 2)
	GUI.table.setColumnStretch(3, 5)

	while GUI.opt_operand.count() > 0: # FIXME
		GUI.opt_operand.removeItem(0)

	GUI.table_rows = list()
	for i, pol in enumerate(system.elements):
		GUI.table_rows.append(TableRow(pol, GUI.table, i + 1))
		GUI.opt_operand.addItem("Element #%d" % (i + 1), i)

def update():
	system.ignore = [False]  * len(system.elements)
	for i, pol in enumerate(system.elements):
		row = GUI.table_rows[i]

		pol.angle = row.angle
		pol.delta = row.delta
		pol.ref = row.optbox.ref.currentData()
		if pol.ref is not False:
			pol.angle += system.elements[pol.ref].angle

		if not row.optbox.enable.isChecked():
			system.ignore[i] = True

	system.recalculate()

	I = 1
	for i, pol in enumerate(system.elements):
		row = GUI.table_rows[i]

		# update all the diagrams
		row.ellipse.state = system.states[i]
		row.ellipse.ellipse = system.ellipses[i]
		row.ellipse.is_used = not system.ignore[i]
		row.ellipse.repaint()
		
		text = "%s (%f°)\nat %f°" \
			% (pol.type, pol.delta * 180 / np.pi,
			   (pol.angle + pol.delta) * 180 / np.pi) 
		row.info_angle.setText(text)

		state = system.states[i]
		ellipse = system.ellipses[i]

		if state is None:
			I = 1
			row.info_jones.setText("Unpolarized")
		else:
			I = np.abs(state[0] * state[0].conjugate() \
				   + state[1] * state[1].conjugate())

		if state is None:
			continue
		
		A, B = state
		text = "I = %f\n" % I
		text += "%f ∠ %+f°\n%f ∠ %+f°\n" % \
		       (np.abs(A), 180 / np.pi * np.angle(A), \
			np.abs(B), 180 / np.pi * np.angle(B))
		text += "α = %f°\nφ = %+f°" % \
		       (180 / np.pi * ellipse.alpha, 180 / np.pi * ellipse.theta)
		text = text.replace("-", "- ").replace("+", "+ ")
		row.info_jones.setText(text)

	GUI.widok.intensity = I
	GUI.widok.repaint()

	#if GUI.auto_optimize.isChecked():
	#	optimize()


#TODO later
#class AddElementWindow(QMainWindow):
#	dialog = None
#
#	def __init__(self):
#		super().__init__()
#
#		chuj = QLabel("adolf")
#		self.setCentralWidget(chuj)
#		self.show()
#
#
#	def __del__(self):
#		AddElementWindow.dialog = None
#
#	def open():
#		if not AddElementWindow.dialog:
#			AddElementWindow.dialog = AddElementWindow()
def half_assed_element_creation(index=None):
	if index is None:
		system.elements.append(phys.Polarizer("linear"))
	else:
		system.elements.insert(index, phys.Polarizer("linear"))

	populate_table()
	GUI.table_frame = QFrame()
	GUI.table_frame.setLayout(GUI.table)
	GUI.scroll.setWidget(GUI.table_frame)
	update()

def half_assed_clear():
	system.elements = list()
	populate_table()
	GUI.table_frame = QFrame()
	GUI.table_frame.setLayout(GUI.table)
	GUI.scroll.setWidget(GUI.table_frame)
	update()

def half_assed_element_deletion(index):
	del(system.elements[index])

	populate_table()
	GUI.table_frame = QFrame()
	GUI.table_frame.setLayout(GUI.table)
	GUI.scroll.setWidget(GUI.table_frame)
	update()


last_save_path = None
file_filter = "Wery Omportant Zejta (*.woz)"

def do_save(win, reuse_old):
	global system, last_save_path

	if reuse_old and last_save_path:
		path = last_save_path
	else:
		path, _ = QFileDialog.getSaveFileName(win, filter=file_filter)
		if path == "":
			return

	try:
		file.save_system(path, system)
	except:
		traceback.print_exc()

	last_save_path = path

def do_open(win):
	global system

	path, _ = QFileDialog.getOpenFileName(win, filter=file_filter)
	if path == "":
		return

	try:
		system = file.open_system(path)
	except:
		traceback.print_exc()

	populate_table()
	GUI.table_frame = QFrame()
	GUI.table_frame.setLayout(GUI.table)
	GUI.scroll.setWidget(GUI.table_frame)
	update()

def setup_menubar(win):
	menu = win.menuBar()

	# File
	open = QAction("&Open a system", win)
	open.setShortcut("Ctrl+O")
	open.triggered.connect(lambda: do_open(win))
	save = QAction("&Save a system", win)
	save.setShortcut("Ctrl+S")
	save.triggered.connect(lambda: do_save(win, True))
	save_as = QAction("&Save a system as...", win)
	save_as.triggered.connect(lambda: do_save(win, False))
	close = QAction("Exit", win)
	close.setShortcut("Ctrl+Q")
	close.triggered.connect(exit)

	file = menu.addMenu("&File")
	file.addAction(open)
	file.addAction(save)
	file.addAction(save_as)
	file.addAction(close)

	# System
	add = QAction("&Add a new element", win)
	add.setShortcut("Ctrl+N")
	add.triggered.connect(half_assed_element_creation)
	clear = QAction("&Remove all elements", win)
	clear.triggered.connect(half_assed_clear)

	system = menu.addMenu("&System")
	system.addAction(add)
	system.addAction(clear)

	win.statusBar()

# FIXME: refactor
def optimize(which):
	if len(system.elements) == 0:
		return

	op_idx = GUI.opt_operand.currentData()
	op = system.elements[op_idx]

	def I(theta):
		op.angle = theta
		if op.ref is not False:
			op.angle += system.elements[op.ref].angle

		state = None
		for i, pol in enumerate(system.elements):
			if i >= len(system.ignore) or not system.ignore[i]:
				state = pol.mul(state)
		if state is None:
			return 1
		else:
			return float(np.abs(state[0] * state[0].conjugate() \
			                    + state[1] * state[1].conjugate()))

	if which == "min":
		f = I
	else:
		f = lambda theta: -I(theta)

	opt = scipy.optimize.minimize_scalar(f, bounds=[0, np.pi], method="bounded")
	GUI.table_rows[op_idx].optbox.angle.edit.setText("%g" % round(opt.x * 180 / np.pi, 3))


def setup(win, system_):
	global system
	system = system_

	# Needless to say, I'm getting real tired of this whole Layout/Widget
	# clusterfuck in Qt
	root = QHBoxLayout()
	root_fucking_random_container = QWidget()
	root_fucking_random_container.setLayout(root)
	win.setCentralWidget(root_fucking_random_container)

	rhs = QVBoxLayout()

	Widocques.image = QImage("/home/enneract/lab/test/c.jpg")
	GUI.widok = Widocques()
	rhs.addWidget(GUI.widok)

	optbox = QHBoxLayout()
	rhs.addLayout(optbox)

	GUI.opt_operand = QComboBox()
	optbox.addWidget(GUI.opt_operand)
	button = QPushButton("Find a minimum")
	button.pressed.connect(lambda: optimize("min"))
	optbox.addWidget(button)
	button = QPushButton("Find a maximum")
	button.pressed.connect(lambda: optimize("max"))
	optbox.addWidget(button)

	GUI.scroll = QScrollArea()
	populate_table()
	GUI.table_frame = QFrame()
	GUI.table_frame.setLayout(GUI.table)
	GUI.scroll.setWidget(GUI.table_frame)

	root.addWidget(GUI.scroll)
	root.addLayout(rhs)

	setup_menubar(win)

	update()
	win.show()