#!/usr/bin/env python3
"""Build a self-contained HTML artifact for sandboxed Gallery viewers."""

from __future__ import annotations

import base64
import json
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
SITE = ROOT / "prototype" / "site"
DEFAULT_OUTPUT = ROOT / "prototype" / "gallery" / "aetherbound-guild-prototype.html"


def data_uri(path: Path) -> str:
    mime = "image/webp" if path.suffix == ".webp" else "application/octet-stream"
    encoded = base64.b64encode(path.read_bytes()).decode("ascii")
    return f"data:{mime};base64,{encoded}"


def main() -> None:
    index = (SITE / "index.html").read_text(encoding="utf-8")
    styles = (SITE / "styles.css").read_text(encoding="utf-8")
    app = (SITE / "app.js").read_text(encoding="utf-8")
    catalog = json.loads((SITE / "data" / "catalog.json").read_text(encoding="utf-8"))

    asset_paths = sorted((SITE / "assets" / "web").glob("*.webp"))
    asset_paths.append(SITE / "favicon.webp")
    for path in asset_paths:
        relative = path.relative_to(SITE).as_posix()
        uri = data_uri(path)
        index = index.replace(relative, uri)
        app = app.replace(relative, uri)

    catalog_json = json.dumps(catalog, ensure_ascii=False, separators=(",", ":"))
    catalog_json = catalog_json.replace("<", "\\u003c")
    app = app.replace("</script", "<\\/script")
    styles = styles.replace("</style", "<\\/style")

    index = index.replace(
        '<link rel="stylesheet" href="styles.css" />',
        f"<style>\n{styles}\n</style>",
    )
    index = index.replace(
        '<script src="app.js" defer></script>',
        f'<script id="prototype-data" type="application/json">{catalog_json}</script>\n'
        f"<script>\n{app}\n</script>",
    )

    if 'href="styles.css"' in index or 'src="app.js"' in index:
        raise RuntimeError("external stylesheet or script remains in bundle")
    if "assets/web/" in index:
        raise RuntimeError("external prototype asset remains in bundle")

    DEFAULT_OUTPUT.parent.mkdir(parents=True, exist_ok=True)
    DEFAULT_OUTPUT.write_text(index, encoding="utf-8")
    print(f"ABG_GALLERY_BUNDLE_OK bytes={DEFAULT_OUTPUT.stat().st_size} output={DEFAULT_OUTPUT}")


if __name__ == "__main__":
    main()