"""Standalone screenshot test for assets/diorama.html.

Serves the repo over http, builds a sample scene with real sprite + backdrop
URLs (relative to the server root), loads the diorama in a headless browser,
captures the canvas, and reports any console errors.
"""
from __future__ import annotations

import base64
import json
import threading
import time
from functools import partial
from http.server import SimpleHTTPRequestHandler, ThreadingHTTPServer
from pathlib import Path

from playwright.sync_api import sync_playwright

ROOT = Path(__file__).resolve().parent.parent
PORT = 8741


def serve():
    handler = partial(SimpleHTTPRequestHandler, directory=str(ROOT))
    httpd = ThreadingHTTPServer(("127.0.0.1", PORT), handler)
    threading.Thread(target=httpd.serve_forever, daemon=True).start()
    return httpd


def scene():
    base = f"http://127.0.0.1:{PORT}/assets"
    chars = [
        ("Joke Dragon", "creature", "char_joke_dragon.png"),
        ("Unfed Bonfire", "place", "char_unfed_bonfire.png"),
        ("Lantern Fox", "creature", "char_lantern_fox.png"),
        ("Blind Cartographer", "character", "char_blind_cartographer.png"),
        ("Crystal Tree", "creature", "char_crystal_tree.png"),
    ]
    return {
        "location": {
            "id": 6, "name": "The Ember Crossroads", "slug": "crossroads",
            "ambience": "The bonfire shifts colour as you approach. It is deciding about you.",
            "lore": "", "special": "", "glow_color": "#e08a3c",
            "backdrop_url": f"{base}/loc_crossroads.jpg",
            "mood": {"fog": "#140a06", "ambient": 0.55, "warmth": 1.2, "particles": "ember"},
        },
        "characters": [
            {"id": f"id{i}", "name": n, "type": t, "status": "active",
             "sprite_url": f"{base}/{f}",
             "profile": {"appearance": "A test soul.", "greeting": "Hello.",
                         "primary_goal": "x", "secondary_goal": "y", "primary_fear": "z",
                         "memory_summary": "", "days_in_realm": 3, "status": "active", "type": t}}
            for i, (n, t, f) in enumerate(chars)
        ],
    }


def main():
    serve()
    time.sleep(0.5)
    b64 = base64.b64encode(json.dumps(scene()).encode()).decode()
    url = f"http://127.0.0.1:{PORT}/assets/diorama.html#data={b64}"

    with sync_playwright() as pw:
        browser = pw.chromium.launch(args=["--use-gl=swiftshader", "--enable-webgl", "--ignore-gpu-blocklist"])
        page = browser.new_page(viewport={"width": 1100, "height": 680})
        errors = []
        page.on("console", lambda m: errors.append(m.text) if m.type == "error" else None)
        page.on("pageerror", lambda e: errors.append(str(e)))
        page.goto(url)
        page.wait_for_timeout(6000)
        out = ROOT / "assets" / "_diorama_shot.png"
        page.screenshot(path=str(out))
        browser.close()
        print("ERRORS:", errors if errors else "none")
        print("shot:", out)


if __name__ == "__main__":
    main()