import glfw
from OpenGL.GL import *
from math import atan
from math import pi

class Vertex:
    def __init__(self, point):
        self.coords = point
        #self.isHole = isHole
        self.isIntersectionPoint = False
        self.isEntry = False

        #self.numberOfHole = numberOfHole ###numbering holes starts with 1, 0 means simple outline, False means clip point
        #self.isFinalInHole = False
    def __len__(self):
        return 1


class Polygon:
    isSbjReady = False
    isHolesReady = False
    listOfEntries = []
    listOfExits = []
    def __init__(self):
        self.points = []
        self.sizes = []
        self.size = 0
    def insert(self, x, i):
        for j in x:
            self.points[i].append(j)
        self.sizes[i] += len(x)
    def append(self, x):
        self.points.append(x)
        self.sizes.append(len(x))
        self.size += 1
    def isEmpty(self):
        if self.size == 0 and self.points == [] and self.sizes == []:
            return True
        else:
            return False

class Clip:
    isClipReady = False
    def __init__(self):
        self.points = []
        self.size = 0
    def append(self, x):
        self.points.append(x)
        self.size += 1

    def isEmpty(self):
        if self.size:
            return False
        else:
            return True

class IntersectionShapes:
    isIntersectionMade = False
    def __init__(self):
        self.points = []
        self.sizes = []
        self.size = 0
    def insert(self, x, i):
        for j in x:
            self.points[i].append(j)
        self.sizes[i] += len(x)
    def append(self, x):
        self.points.append(x)
        self.sizes.append(len(x))
        self.size += 1
    def isEmpty(self):
        if self.size == 0 and self.points == [] and self.sizes == []:
            return True
        else:
            return False


# global isCurrentHoleReady
# isCurrentHoleReady = False
global startPoint
startPoint = False
def mouseCallback(window, button, action, mods):
    global startPoint
    if button == glfw.MOUSE_BUTTON_1 and action:
        mouse = glfw.get_cursor_pos(window)
        mouse = [int(mouse[0]), 480 - int(mouse[1])]
        p = Vertex(mouse)
        if not polygon.isSbjReady and not polygon.isHolesReady and not clip.isClipReady:
            if polygon.isEmpty():
                if not startPoint:
                    startPoint = True
                    polygon.append([p])
            else:
                polygon.insert([p], 0)
        #print("isSbjReady", polygon.isSbjReady, "isHolesReady", polygon.isHolesReady, "isClipReady", clip.isClipReady)
        #print(polygon.size)
        if polygon.isSbjReady and not polygon.isHolesReady and not clip.isClipReady:
            if not startPoint:
                startPoint = True
                polygon.append([p])
            else:
                polygon.insert([p], polygon.size - 1)
        if polygon.isSbjReady and polygon.isHolesReady and not clip.isClipReady:
            # if not startPoint:
            #     startPoint = True
            #     clip.append(p)
            # else:
            clip.append(p)
        #print(polygon.size)
        #print(polygon.sizes)
        # for i in range(polygon.size):
        #     for j in range(polygon.sizes[i]):
        #         print(polygon.points[i][j].coords)


def keyCallback(window, key, scancode, action, mods):
    #global isCurrentHoleReady
    global startPoint
    if key == glfw.KEY_SPACE and action:
        if not polygon.isSbjReady and not polygon.isHolesReady and not clip.isClipReady:
            startPoint = False
            polygon.isSbjReady = True
            print("PRESS SPACE TO SKIP DRAWING HOLES")
        elif polygon.isSbjReady and not polygon.isHolesReady and not clip.isClipReady:
            #isCurrentHoleReady = True
            startPoint = False
            polygon.isHolesReady = True
        elif polygon.isSbjReady and polygon.isHolesReady and not clip.isClipReady:
            #startPoint = False
            clip.isClipReady = True
    if key == glfw.KEY_H and action:
        polygon.isHolesReady = False
    if key == glfw.KEY_ENTER and action:
        makeIntersection()


def isClipInside():
    maxXofClip = -1
    for i in range(clip.size):
        if clip.points[i].coords[0] > maxXofClip:
            maxXofClip = clip.points[i].coords[0]
    maxXofSbj = -1
    for i in range(polygon.sizes[0]):
        if polygon.points[0][i].coords[0] > maxXofSbj:
            maxXofSbj = polygon.points[0][i].coords[0]

    if maxXofClip > maxXofSbj:
        return False
    else:
        return True


def checkForEntry(point, points):
    maxX = max([i.coords[0] for i in points])
    minX = min([i.coords[0] for i in points])
    maxY = max([i.coords[1] for i in points])
    minY = min([i.coords[1] for i in points])

    if point.coords[0] > minX and point.coords[0] < maxX and point.coords[1] > minY and point.coords[1] < maxY:
        return False
    else:
        return True


def makeIntersection():
    oldSizes = polygon.sizes
    searchForIntersections()

    # if oldSizes == polygon.sizes:
    #     if isClipInside():
    #         intersectionShapes.points = [clip.points]
    #         intersectionShapes.size = 1
    #         intersectionShapes.sizes = [clip.size]
    #     else:
    #         intersectionShapes.points = polygon.points
    #         intersectionShapes.sizes = polygon.sizes
    #         intersectionShapes.size = polygon.size
    # else:
    entry = checkForEntry(polygon.points[0][0], clip.points)

    for i in range(polygon.size):
        for j in range(polygon.sizes[i]):
            if polygon.points[i][j].isIntersectionPoint:
                k = clip.points.index(polygon.points[i][j])
                polygon.points[i][j].isEntry = entry
                clip.points[k].isEntry = entry
                l = polygon.points[i][j]
                if entry:
                    polygon.listOfEntries.append(l)
                else:
                    polygon.listOfExits.append(l)
                entry = not entry

    print("list of entries", [i.coords for i in polygon.listOfEntries])
    print("polygon coords", [i.coords for i in polygon.points[0]])
    print("clip coords", [i.coords for i in clip.points])

    makeIntersectionShapes()


def makeIntersectionShapes():
    points = []
    size = 0
    goToListOfEntries = False
    startPoint = False
    while polygon.listOfEntries != []:
        a = polygon.listOfEntries.pop() ###here may be some problems
        if not startPoint:
            startPoint = a
        # for i in polygon.points:
        #     for j in i:
        #         if a == j:
        #             points.append(a)
        #             size += 1
        #             for x in range(i.index(j), i.index(j) +len(i)):
        #                 points.append(i[x % len(i)])
        for i in range(polygon.size):
            if goToListOfEntries:
                break
            for j in range(polygon.sizes[i]):
                if goToListOfEntries:
                    break
                if a == polygon.points[i][j]:
                    points.append(a)
                    print("points1", [r.coords for r in points])
                    size += 1
                    print("size =", size)
                    for x in range(j + 1, j + polygon.sizes[i]):
                        if goToListOfEntries:
                            break
                        p = polygon.points[i][x % polygon.sizes[i]]
                        print("p", p.coords, "index =", x % polygon.sizes[i], "x =", x)
                        if not p.isIntersectionPoint:
                            points.append(p)
                            size += 1
                            print("points2", [r.coords for r in points])
                            print("size =", size)
                        else:
                            print("GG WP")
                            z = clip.points.index(p)
                            points.append(p)
                            size += 1
                            print("points3", [r.coords for r in points])
                            print("size =", size)
                            print("p index in clip", z)
                            for y in range(z + 1, z + clip.size):
                                point = clip.points[y]
                                #size += 1
                                #print(point.coords, "isIntersection?", point.isIntersectionPoint)
                                if not point.isIntersectionPoint:
                                    points.append(point)
                                    size += 1
                                    print("points4", [r.coords for r in points])
                                    print("size =", size)
                                else:
                                    goToListOfEntries = True
                                    if point == startPoint:
                                        intersectionShapes.points.append(points)
                                        intersectionShapes.size += 1
                                        intersectionShapes.sizes.append(size)
                                        points = []
                                        size = 0
                                        startPoint = False
                                    break
        if goToListOfEntries:
            goToListOfEntries = False




def searchForIntersections():
    newSbjPoints = []
    newClipPoints = []

    newSbjSizes = []
    newSbjSize = 0
    newClipSize = 0

    for i in range(polygon.size):
        points = []
        size = 0
        for k in range(polygon.sizes[i]):
            points.append(polygon.points[i][k])
            size += 1
            intersectionPoints = []
            intersectionPointsCount = 0
            for j in range(clip.size):
                if clip.points[j] not in newClipPoints:
                    newClipPoints.append(clip.points[j])
                    newClipSize += 1
                I = intersectionFound([polygon.points[i][k].coords, polygon.points[i][(k + 1) % polygon.sizes[i]].coords], [clip.points[j].coords, clip.points[(j + 1) % clip.size].coords])
                if I:
                    intersectionPointsCount += 1
                    p = Vertex(I)
                    p.isIntersectionPoint = True
                    intersectionPoints.append(p)
                    intersectionPointsCount += 1
                    newClipPoints.append(p)
                    newClipSize += 1
            intersectionPoints = makeOrder(intersectionPoints, polygon.points[i][k], polygon.points[i][(k + 1) % polygon.sizes[i]])
            if intersectionPoints != []:
                for l in intersectionPoints:
                    points.append(l)
                    size += 1
        newSbjPoints.append(points)
        newSbjSize += 1
        newSbjSizes.append(size)

    polygon.points = newSbjPoints
    polygon.sizes = newSbjSizes
    polygon.size = newSbjSize

    #print(polygon.sizes)

    global center
    center = findCenterOfMass(newClipPoints)
    newClipPoints.sort(key=sort, reverse=True)

    clip.points = newClipPoints
    clip.size = newClipSize

    #for i in polygon.points[0]:
    #    print(i.coords)

def findCenterOfMass(points):
    m = n = 0
    count = 0
    for i in points:
        m += i.coords[0]
        n += i.coords[1]
        count += 1
    return [m / count, n / count]

def sort(p):
    point = [p.coords[0] - center[0], p.coords[1] - center[1]]
    phi = atan(point[1] / point[0])
    if point[0] < 0 and point[1] > 0 or point[0] < 0 and point[1] < 0:
        phi += pi
    if point[0] > 0 and point[1] < 0:
        phi += 2 * pi
    return phi


def intersectionFound(edge1, edge2):
    if checkForBelonging(edge1[0], edge2) or checkForBelonging(edge1[1], edge2) or checkForBelonging(edge2[0], edge1) or checkForBelonging(edge2[1], edge1):
        #print("I'm here")
        return False
    #print("edge1 =", edge1, "edge2 =", edge2)
    A = edge1[0]
    C = edge2[0]
    #print("A =", A, "C =", C)
    c = [C[0] - A[0], C[1] - A[1]]
    #print("c =", c)
    b = [edge1[1][0] - edge1[0][0], edge1[1][1] - edge1[0][1]]
    d = [edge2[1][0] - edge2[0][0], edge2[1][1] - edge2[0][1]]
    #print("b =", b, "d =", d)
    dVert = [-d[1], d[0]]
    bVert = [-b[1], b[0]]
    #print("dVert =", dVert)
    m = dVert[0] * c[0] + dVert[1] * c[1]
    n = dVert[0] * b[0] + dVert[1] * b[1]
    #print("числитель:", m, "знаменатель:", n)
    if n == 0:
        return False
    t = m / n
    #print("t =", t)
    q = bVert[0] * c[0] + bVert[1] * c[1]
    u = q / n
    #print("u =", u)
    if t < 0 or t > 1 or u < 0 or u > 1:
        return False
    pr = [b[0] * t, b[1] * t]
    #print("t * b =", pr)
    I = [A[0] + pr[0], A[1] + pr[1]]
    #print("I =", I)
    return I


def checkForBelonging(point, edge): ###edge = [[x1, y1], [x2, y2]]
    # print("point =", point, "edge =", edge)
    maxX = max(edge[0][0], edge[1][0])
    minX = min(edge[0][0], edge[1][0])
    maxY = max(edge[0][1], edge[1][1])
    minY = min(edge[0][1], edge[1][1])

    if point[0] <= maxX and point[0] >= minX and point[1] <= maxY and point[1] >= minY:
        if not ((point[0] - edge[0][0]) * (edge[1][1] - edge[0][1]) - (point[1] - edge[0][1]) * (
            edge[1][0] - edge[0][0])):
            return True
        else:
            return False
    else:
        return False


def sign(a, b):
    if a < b:
        return 1
    elif a == b:
        return 0
    else:
        return -1


def makeOrder(points, point1, point2):
    intersectionPoints = points
    # if point1.coords[0] < point2.coords[0]:
    #     sx = 1
    # elif point1.coords[0] == point2.coords[0]:
    #     sx = 0
    # else:
    #     sx = -1
    # if point1.coords[1] < point2.coords[1]:
    #     sy = 1
    # elif point1.coords[1] == point2.coords[1]:
    #     sy = 0
    # else:
    #     sy = -1
    sx = sign(point1.coords[0], point2.coords[0])
    sy = sign(point1.coords[1], point2.coords[1])
    if sx > 0:
        intersectionPoints.sort(key=lambda x: x.coords[0])
    elif sx < 0:
        intersectionPoints.sort(key=lambda x: -x.coords[0])
    else:
        if sy > 0:
            intersectionPoints.sort(key=lambda x: x.coords[1])
        else:
            intersectionPoints.sort(key=lambda x: -x.coords[1])
    return intersectionPoints


def background():
    glClearColor(1.0, 1.0, 1.0, 1.0)
    glClear(GL_COLOR_BUFFER_BIT)


def chngCoordf(point):
    width = 640
    height = 480

    x = point[0] * 2 / width - 1
    y = point[1] * 2 / height - 1

    return x, y


def drawShape(points, pointsCount, color):
    glBegin(GL_POLYGON)

    glColor3f(color[0], color[1], color[2])

    for i in range(pointsCount):
        x, y = chngCoordf(points[i].coords)
        glVertex(x, y)

    glEnd()


def drawLines(points, count, color):
    glBegin(GL_LINE_STRIP)
    glColor3f(color[0], color[1], color[2])
    for i in range(count):
        x, y = chngCoordf(points[i].coords)
        glVertex2f(x, y)
    glEnd()

def drawLine(point1, point2, color):
    x1, y1 = chngCoordf(point1.coords)
    x2, y2 = chngCoordf(point2.coords)
    glBegin(GL_LINES)

    glColor3f(color[0], color[1], color[2])
    glVertex2f(x1, y1)
    glVertex2f(x2, y2)

    glEnd()

def draw():
    if not polygon.isEmpty():
        if polygon.size == 1:
            if polygon.isSbjReady:
                drawShape(polygon.points[0], polygon.sizes[0], [0.0, 0.0, 0.0])
            else:
                drawLines(polygon.points[0], polygon.sizes[0], [0.0, 0.0, 0.0])
        else:
            drawShape(polygon.points[0], polygon.sizes[0], [0.0, 0.0, 0.0])
            if polygon.isHolesReady:
                for i in range(1, polygon.size):
                    drawShape(polygon.points[i], polygon.sizes[i], [1.0, 1.0, 1.0])
            else:
                for i in range(1, polygon.size - 1):
                    drawShape(polygon.points[i], polygon.sizes[i], [1.0, 1.0, 1.0])
                for i in range(polygon.size - 1, polygon.size):
                    drawLines(polygon.points[i], polygon.sizes[i], [1.0, 1.0, 1.0])
    if not clip.isEmpty():
        if clip.isClipReady:
            for i in range(clip.size):
                drawLine(clip.points[i], clip.points[(i + 1) % clip.size], [0, 0, 1.0])
        else:
            for i in range(clip.size):
                drawLines(clip.points, clip.size, [0.0, 0.0, 1.0])
    if not intersectionShapes.isEmpty():
        for i in range(intersectionShapes.size):
            #print("shapes coords", [j.coords for j in intersectionShapes.points[i]])
            print("shape", [s.coords for s in intersectionShapes.points[i]], "sizes", intersectionShapes.sizes)
            drawShape(intersectionShapes.points[i], intersectionShapes.sizes[i], [1.0, 0, 0])


class Drawer:
    window = False

    def __init__(self):
        if not glfw.init():
            return

        self.window = glfw.create_window(640, 480, "Lab5", None, None)
        if not self.window:
            glfw.terminate()
            return

        glfw.make_context_current(self.window)

        glfw.set_mouse_button_callback(self.window, mouseCallback)
        glfw.set_key_callback(self.window, keyCallback)
        #glfw.set_window_size_callback(self.window, sizeCallback)


    def startLoop(self):
        while not glfw.window_should_close(self.window):
            background()
            draw()

            glfw.swap_buffers(self.window)
            glfw.poll_events()

        glfw.terminate()

polygon = Polygon()
clip = Clip()
intersectionShapes = IntersectionShapes()
drawer = Drawer()
drawer.startLoop()