import pgzrun
import random
import math

WIDTH = 800
HEIGHT = 600

APPLE_POS = (WIDTH / 2, HEIGHT / 2)
DINO_SPEED = 120
START_SPAWN_INTERVAL = 2.0
MIN_SPAWN_INTERVAL = 0.2
SPAWN_ACCELERATION = 0.3
CORPSE_LIFETIME = 2.0
APPLE_HIT_RADIUS = 25

apple = Actor("apple", APPLE_POS) # Sprite

sword = Actor("sword", APPLE_POS) # Sprite

dinosaurs = []
corpses = []

spawn_interval = START_SPAWN_INTERVAL
spawn_timer = 0
game_time = 0
score = 0
missed_apples = 0

def on_mouse_move(pos, rel, buttons):
    """Keep the sword centered on the mouse pointer."""
    sword.pos = pos

def spawn_dinosaurs():
    """Create a dinosaur just outside one edge of the screen."""
    dino_images = ("dino", "dino2","dino3")
    random_dino = random.choice(dino_images)
    dino = Actor(random_dino)

    side = random.randint(0, 3)
    if side == 0: # up
        dino.x = random.randint(0, WIDTH)
        dino.y = -50
    elif side == 1: # down
        dino.x = random.randint(0, WIDTH)
        dino.y = HEIGHT + 50
    elif side == 2: # left
        dino.x = -50
        dino.y = random.randint(0, HEIGHT)
    else:
        dino.x = WIDTH + 50
        dino.y = random.randint(0, HEIGHT)
    dinosaurs.append(dino)


def update(dt):
    global spawn_timer, spawn_interval, game_time, score, missed_apples
    game_time += dt
    spawn_timer += dt
    
    # Gradually reduce the delay between spawns so the game gets harder.
    spawn_interval = max(MIN_SPAWN_INTERVAL, spawn_interval - SPAWN_ACCELERATION * dt)

    if spawn_timer >= spawn_interval:
        spawn_dinosaurs()
        spawn_timer = 0

    for dino in dinosaurs[:]:
        dx = apple.x - dino.x
        dy = apple.y - dino.y
        distance = math.hypot(dx, dy)

        # Move at a steady speed toward the apple instead of jumping farther
        # when the dinosaur is far away.
        if distance > 0:
            dino.x += (dx / distance) * DINO_SPEED * dt
            dino.y += (dy / distance) * DINO_SPEED * dt
        
        if dino.colliderect(sword):
            dino.image = "dead"
            corpses.append({"actor": dino, "die_time": game_time})
            sounds.hit.play()
            score += 1
            dinosaurs.remove(dino)
        elif distance <= APPLE_HIT_RADIUS:
            missed_apples += 1
            dinosaurs.remove(dino)
    
    for corpse in corpses[:]:
        if game_time - corpse["die_time"] >= CORPSE_LIFETIME:
            corpses.remove(corpse)
            

def draw():
    screen.fill((100, 200, 100))
    apple.draw()
    for dino in dinosaurs:
        dino.draw()
    for corpse in corpses:
        corpse["actor"].draw()
    sword.draw()
    screen.draw.text(f"Score: {score}", (10, 10), fontsize=36, color="white")
    screen.draw.text(f"Missed: {missed_apples}", (10, 50), fontsize=36, color="white")

pgzrun.go()