"""Generate placeholder sprite assets using Pillow."""
from pathlib import Path
from PIL import Image, ImageDraw, ImageFont

ASSETS = Path(__file__).parent.parent / "app" / "static" / "assets"

SPECIES_COLORS = {
    "cat":     (180, 140, 90),
    "dog":     (160, 120, 70),
    "rabbit":  (220, 200, 180),
    "bird":    (80,  140, 200),
    "fox":     (200, 100, 40),
    "hamster": (220, 180, 130),
    "turtle":  (80,  140, 80),
    "corgi":   (200, 150, 80),
    "hound":   (120, 100, 80),
}

EXPRESSION_TINTS = {
    "neutral":  (0, 0, 0, 0),
    "nervous":  (40, 0, 0, 30),
    "angry":    (80, 0, 0, 60),
    "guilty":   (0, 0, 60, 40),
}


def _darken(color, amount=40):
    return tuple(max(0, c - amount) for c in color)


def make_animal_sprite(species: str, size: int = 32) -> Image.Image:
    color = SPECIES_COLORS.get(species, (150, 150, 150))
    img = Image.new("RGBA", (size, size), (0, 0, 0, 0))
    draw = ImageDraw.Draw(img)
    # Body ellipse
    draw.ellipse([4, 8, size - 4, size - 4], fill=color + (255,))
    # Head circle
    head_size = size // 3
    draw.ellipse([size // 2 - head_size, 1, size // 2 + head_size, head_size * 2 + 1],
                 fill=_darken(color, 20) + (255,))
    # Eyes
    ey = head_size // 2 + 1
    draw.ellipse([size // 2 - head_size // 2, ey, size // 2 - head_size // 2 + 3, ey + 3],
                 fill=(20, 20, 20, 255))
    draw.ellipse([size // 2 + head_size // 2 - 4, ey, size // 2 + head_size // 2 - 1, ey + 3],
                 fill=(20, 20, 20, 255))
    return img


def make_portrait(species: str, expression: str, size: int = 128) -> Image.Image:
    color = SPECIES_COLORS.get(species, (150, 150, 150))
    tint = EXPRESSION_TINTS.get(expression, (0, 0, 0, 0))
    img = Image.new("RGBA", (size, size), (13, 27, 42, 255))
    draw = ImageDraw.Draw(img)

    # Body
    body_color = tuple(min(255, c + tint[i]) for i, c in enumerate(color))
    draw.ellipse([size // 6, size // 3, size * 5 // 6, size - 4],
                 fill=body_color + (255,))
    # Head
    head_r = size // 4
    cx = size // 2
    cy = size // 3
    draw.ellipse([cx - head_r, cy - head_r, cx + head_r, cy + head_r],
                 fill=_darken(body_color, 15) + (255,))
    # Eyes
    ex_off = head_r // 2
    ey_off = head_r // 6
    eye_r = max(3, head_r // 5)
    for ex in [cx - ex_off, cx + ex_off]:
        draw.ellipse([ex - eye_r, cy - ey_off - eye_r, ex + eye_r, cy - ey_off + eye_r],
                     fill=(255, 255, 255, 255))
        inner = eye_r // 2
        draw.ellipse([ex - inner, cy - ey_off - inner, ex + inner, cy - ey_off + inner],
                     fill=(20, 20, 20, 255))

    # Expression-specific mouth
    if expression in ("nervous", "guilty"):
        draw.arc([cx - head_r // 3, cy + head_r // 4, cx + head_r // 3, cy + head_r // 2],
                 0, 180, fill=(20, 20, 20, 255), width=2)
    elif expression == "angry":
        draw.line([cx - head_r // 3, cy + head_r // 3, cx + head_r // 3, cy + head_r // 3],
                  fill=(20, 20, 20, 255), width=2)
        # Angry brows
        draw.line([cx - ex_off - eye_r, cy - ey_off - eye_r * 2,
                   cx - ex_off + eye_r, cy - ey_off - eye_r],
                  fill=(80, 20, 20, 255), width=2)
        draw.line([cx + ex_off - eye_r, cy - ey_off - eye_r,
                   cx + ex_off + eye_r, cy - ey_off - eye_r * 2],
                  fill=(80, 20, 20, 255), width=2)
    else:
        draw.arc([cx - head_r // 3, cy + head_r // 8, cx + head_r // 3, cy + head_r // 2],
                 180, 360, fill=(20, 20, 20, 255), width=2)

    # Name label at bottom
    draw.rectangle([0, size - 22, size, size], fill=(13, 27, 42, 200))
    draw.text((4, size - 18), f"{species} · {expression}",
              fill=(228, 213, 163, 255))

    return img


def make_tile(name: str, color: tuple, size: int = 32) -> Image.Image:
    img = Image.new("RGBA", (size, size), color + (255,))
    draw = ImageDraw.Draw(img)
    draw.rectangle([0, 0, size - 1, size - 1], outline=(0, 0, 0, 60), width=1)
    return img


def generate_all():
    animals_dir = ASSETS / "animals"
    portraits_dir = ASSETS / "portraits"
    tiles_dir = ASSETS / "tiles"

    for d in [animals_dir, portraits_dir, tiles_dir]:
        d.mkdir(parents=True, exist_ok=True)

    for species in SPECIES_COLORS:
        sprite = make_animal_sprite(species)
        sprite.save(animals_dir / f"{species}_idle.png")
        for i in range(4):
            sprite.save(animals_dir / f"{species}_walk_{i}.png")

    for species in SPECIES_COLORS:
        for expression in EXPRESSION_TINTS:
            portrait = make_portrait(species, expression)
            portrait.save(portraits_dir / f"{species}_{expression}.png")

    tile_defs = {
        "floor_dark":    (20, 20, 30),
        "floor_wood":    (80, 55, 30),
        "wall_brick":    (60, 35, 25),
        "wall_plaster":  (45, 45, 50),
        "grass":         (25, 55, 25),
        "path":          (50, 45, 35),
        "door":          (90, 60, 30),
        "furniture_bed": (70, 50, 80),
        "furniture_sofa":(50, 40, 70),
        "furniture_table":(65, 45, 25),
        "tree":          (20, 60, 20),
        "bush":          (30, 70, 30),
        "fence":         (70, 55, 35),
    }
    for name, color in tile_defs.items():
        tile = make_tile(name, color)
        tile.save(tiles_dir / f"{name}.png")

    print(f"Generated assets in {ASSETS}")
    print(f"  animals/: {len(list(animals_dir.iterdir()))} files")
    print(f"  portraits/: {len(list(portraits_dir.iterdir()))} files")
    print(f"  tiles/: {len(list(tiles_dir.iterdir()))} files")


if __name__ == "__main__":
    generate_all()