from __future__ import annotations

import json
from pathlib import Path

from PIL import Image, ImageDraw, ImageFont


def _load_cfg(path: Path) -> dict:
    return json.loads(path.read_text(encoding="utf-8"))


def _is_zero(pt) -> bool:
    try:
        return int(pt[0]) == 0 and int(pt[1]) == 0
    except Exception:
        return True


def main() -> int:
    root = Path(__file__).resolve().parents[1]
    img_path = root / "outputs" / "bluestacks" / "validate_base.png"
    cfg_path = root / "config" / "bluestacks_gameplay.local.json"
    out_path = root / "outputs" / "bluestacks" / "validate_overlay.png"

    if not img_path.exists():
        raise SystemExit(f"missing screenshot: {img_path}")
    if not cfg_path.exists():
        raise SystemExit(f"missing calibration: {cfg_path}")

    cfg = _load_cfg(cfg_path)
    img = Image.open(img_path).convert("RGBA")
    draw = ImageDraw.Draw(img)

    try:
        font = ImageFont.truetype("Arial.ttf", 18)
    except Exception:
        font = ImageFont.load_default()

    points: list[tuple[str, tuple[int, int], str]] = []

    # Card slots
    for k in ("1", "2", "3", "4"):
        pt = cfg.get("card_slots", {}).get(k, [0, 0])
        points.append((f"S{k}", (int(pt[0]), int(pt[1])), "yellow"))

    # Key grid cells
    for cell in ("A1", "A8", "H1", "H8", "E2", "E7", "D2", "D7"):
        pt = cfg.get("grid", {}).get(cell, [0, 0])
        points.append((cell, (int(pt[0]), int(pt[1])), "cyan"))

    # Draw points
    for label, (x, y), color in points:
        r = 10
        fill = (255, 0, 0, 180) if (x == 0 and y == 0) else (0, 0, 0, 0)
        outline = (255, 64, 64, 255) if (x == 0 and y == 0) else (0, 255, 255, 255) if color == "cyan" else (255, 255, 0, 255)
        draw.ellipse([x - r, y - r, x + r, y + r], fill=fill, outline=outline, width=3)
        draw.rectangle([x + 12, y - 12, x + 12 + 46, y + 12], fill=(0, 0, 0, 160))
        draw.text((x + 16, y - 10), label, fill=(255, 255, 255, 255), font=font)

    # Header
    header = f"Calibration overlay  |  cfg={cfg_path.name}  |  red = (0,0) invalid"
    draw.rectangle([0, 0, img.size[0], 34], fill=(0, 0, 0, 200))
    draw.text((10, 8), header, fill=(255, 255, 255, 255), font=font)

    img.save(out_path)
    print(out_path)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())