import pygame
import sys
import random
from pygame.locals import *

pygame.init()
vec = pygame.math.Vector2

HEIGHT = 450
WIDTH = 400
ACC = 0.5
FRIC= -0.12
FPS = 60

framepersec = pygame.time.Clock()

displaysurface = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Game")
class player(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.surf = pygame.Surface((30, 30))
        self.surf.fill((128,225,40))
        self.rect = self.surf.get_rect(center = (10,420))

        self.pos = vec((10,385))
        self.vel = vec(0,0)
        self.acc = vec(0,0)

        self.jumping = False

    def jump(self):
        hits = pygame.sprite.spritecollide(P1, platforms, False)
        if hits and not self.jumping:
                self.jumping = True
                self.vel.y -= 15

    def move(self):
        self.acc = vec(0,0.5)

        pressed_key = pygame.key.get_pressed()

        if pressed_key[K_LEFT]:
            self.acc.x = -ACC
        if pressed_key[K_RIGHT]:
            self.acc.x = ACC

        self.acc.x += self.vel.x * FRIC
        self.vel += self.acc
        self.pos += self.vel + 0.5 * self.acc

        if self.pos.x > WIDTH:
            self.pos.x = 0
        if self.pos.x < 0:
            self.pos.x = WIDTH

        self.rect.midbottom = self.pos

    def update(self):
        hits = pygame.sprite.spritecollide(P1, platforms, False)
        if P1.vel.y >0:
            if hits:
                if self.pos.y < hits[0].rect.bottom:
                    self.pos.y = hits[0].rect.top + 1
                    self.vel.y = 0
                    self.jumping = False
    
    def cancel_jump(self):
        if self.jumping:
            if self.vel.y < -3:
                self.vel.y + -3

class platform(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.surf = pygame.Surface((random.randint(50,100), 12))
        self.surf.fill((255,0,0))
        self.rect = self.surf.get_rect(center = (random.randint(0,WIDTH-10),
                                                 random.randint(0,HEIGHT-30)))

def check(platform, groupies):
    if pygame.sprite.spritecollideany(platform,groupies):
        return True
    else:
        for entity in groupies:
            if entity == platform:
                continue
            if (abs(platform.rect.top - entity.rect.bottom) <50) and (abs(platform.rect.bottom - entity.rect.top) < 50):
                return True
        C = False



def plat_gen():
    while len(platforms) < 6 :
        width = random.randrange(50,100)
        p = platform()
        p.rect.center= (random.randrange(0, WIDTH - width), random.randrange(-50, 0))
        platforms.add(p)
        all_sprites.add(p)

PT1 = platform()
P1 = player()

PT1.surf = pygame.Surface((WIDTH, 20))
PT1.surf.fill((255,0,0))
PT1.rect = PT1.surf.get_rect(center = (WIDTH/2, HEIGHT - 10))

all_sprites = pygame.sprite.Group()
all_sprites.add(PT1)
all_sprites.add(P1)

platforms = pygame.sprite.Group()
platforms.add(PT1)

for x in range(random.randint(5, 6)):
    C = True
    Pl = platform()

    while C:
        Pl = platform()
        C = check(Pl, platforms)
    platforms.add(Pl)
    all_sprites.add(Pl)

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                P1.jump()
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_SPACE:
                P1.cancel_jump()

    if P1.rect.top <= HEIGHT / 3:
        P1.pos.y += abs(P1.vel.y)
        for plat in platforms:
            plat.rect.y += abs(P1.vel.y)
            if plat.rect.top >= HEIGHT:
                plat.kill()

    displaysurface.fill((0,0,0))

    P1.move()
    P1.update()
    plat_gen()

    for entity in all_sprites:
        displaysurface.blit(entity.surf, entity.rect)

    pygame.display.update()
    framepersec.tick(FPS)