#!/usr/bin/env python3
try:
    from numpy import complex256
except ImportError:
    from numpy import complex128 as complex256 
    print("Warning! Cannot use full precision!")

from time import time_ns, sleep
from cmath import exp, pi
import pygame
import pygame.freetype
from gyro import *
from lines import *

def deg2rad(rA): return rA/180*PI

I = complex256(complex(0,1))
WHITE = (255,255,255)
BLACK = (0,0,0)
OFFSET = 0.015625
PI = pi
ROT = cNorm(exp(deg2rad(2)*I))
IROT = 1/ROT
F = 5 * 10**7
F_ = 10**9

SKY = (127,127,255)
GROUND = (102, 51, 0)

class Segment:
    def __init__(self,bA,cA,cB,trColor):
        self.isFinite = bA
        self.pointA = cA
        self.pointB = cB
        self.color = trColor

class DrawnSegment:
    def __init__(self,height,color):
        self.height = height
        self.color = color

level = [
        Segment(True,.6,I*.6,(255,0,0)),
        Segment(True,.6,-I*.6,(0,255,0)),
        Segment(True,-.6,-I*.6,(0,0,255)),
        Segment(True,-.6,I*.6,(255,255,0))
        ]

def draw(level,gPlayer,fov,res):
    drawn = list()
    irot = exp(fov/res*I)
    iprot = gPlayer.cRot
    for i in range(res):
        m = DrawnSegment(0,BLACK)
        rot = irot**(i-(res/2)) * iprot
        for j in level:
            tA = Poincare2Klein(MobiusAdd(j.pointA,-gPlayer.cPos))
            tB = Poincare2Klein(MobiusAdd(j.pointB,-gPlayer.cPos))
            try: # This function faults from time to time
                cInt = cLineIntersection(tA,tB,complex256(0),rot)
            except ZeroDivisionError:
                continue
            rDist = cDist(0,cInt) * irot.real
            if not (j.isFinite and cBetween(tA,tB,cInt)):
                continue
            if cDot(cInt,rot) > 0:
                continue
            if (1 - m.height) > rDist:
                m = DrawnSegment(1-rDist,j.color)
        drawn.append(m)
    return drawn

def cap(rN):
    if rN < 0:
        return 0
    return rN

def renderDebugInfo(gPlayer, clock, fontSize = 18):
    font = pygame.freetype.Font(None, fontSize)
    font_fg = (255, 255, 255)
    font_bg = (255, 255, 255, 80)

    fps_surf = font.render("FPS: " + str(int(clock.get_fps())), font_fg, font_bg)[0]
    cPos_surf = font.render("cPos: " + str(gPlayer.cPos), font_fg, font_bg)[0]
    cRot_surf = font.render("cRot: " + str(gPlayer.cRot), font_fg, font_bg)[0]

    return fps_surf, cPos_surf, cRot_surf

def mainLoop():
    gPlayer = GyroVector(0,1)
    display = pygame.display.set_mode((1280,720))
    clock = pygame.time.Clock()
    fontSize = 18
    debugInfo = True

    while True:
        #framestart = time_ns()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                return True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_q:
                    gPlayer.cRot *= -1
        keys = pygame.key.get_pressed()
        if keys[pygame.K_d]:
            gPlayer.rotate(ROT)
        if keys[pygame.K_a]:
            gPlayer.rotate(IROT)
        if keys[pygame.K_w]:
            gPlayer -= GyroVector(OFFSET * gPlayer.cRot, 1)
        if keys[pygame.K_s]:
            gPlayer += GyroVector(OFFSET * gPlayer.cRot, 1)
        if keys[pygame.K_F3]:
            debugInfo = not debugInfo

        display.fill(WHITE)
        #pygame.draw.rect(display,BLACK, c_tr(Poincare2Klein(gPlayer.cPos) * -100) + (100,100),0)
        drawn = draw(level,gPlayer,PI/2,160)
        pygame.draw.rect(display,SKY,    (0,0,1280,360))
        pygame.draw.rect(display,GROUND, (0,360,1280,360))
        n = 0
        for i in drawn:
            pygame.draw.rect(display,i.color, (n,(1 - i.height) * 360,8,cap(i.height) * 1280))
            n += 8

        if debugInfo:
            fps_surf, cPos_surf, cRot_surf = renderDebugInfo(gPlayer, clock, fontSize)

            display.blit(fps_surf, (0, 0))
            display.blit(cPos_surf, (0, fps_surf.get_height()))
            display.blit(cRot_surf, (0, fps_surf.get_height() + fontSize))
            for i in level:
                a = complex(Poincare2Klein(MobiusAdd(i.pointA,-gPlayer.cPos)))
                b = complex(Poincare2Klein(MobiusAdd(i.pointB,-gPlayer.cPos)))
                pygame.draw.line(display, WHITE, (a.real * 100 + 100, (a.imag * 100 + 200)), (b.real * 100 + 100, (b.imag * 100 + 200)))

        pygame.display.update()

        #frameend = time_ns()
        clock.tick()
        #sleep((frameend-framestart) / F_)
    return True

def main():
    pygame.init()
    pygame.display.set_caption('P3HE')
    if not pygame.get_init():
        return False
    retstatus = mainLoop()
    return retstatus

if __name__ == "__main__":
    if not main():
        print("An error occured")