from pathlib import Path
import tempfile
import unittest

from fastapi import FastAPI
from fastapi.testclient import TestClient

from web.static_files import NoCacheStaticFiles


ROOT = Path(__file__).resolve().parents[1]
STATIC_DIR = ROOT / "web" / "static"
DEV_HTML = STATIC_DIR / "dev.html"
JS_DIR = STATIC_DIR / "js"
VENDOR_DIR = STATIC_DIR / "vendor" / "markdown"


def _frontend_source() -> str:
    """dev.html + 拆出的 ES module 源(路径 1 模块化后逻辑散落 js/*.js)合并文本。"""
    parts = [DEV_HTML.read_text(encoding="utf-8")]
    parts += [p.read_text(encoding="utf-8") for p in sorted(JS_DIR.glob("*.js"))]
    return "\n".join(parts)


class StaticVendorTests(unittest.TestCase):
    def test_dev_html_uses_local_markdown_vendor_assets(self) -> None:
        html = DEV_HTML.read_text(encoding="utf-8")

        self.assertNotIn("cdn.jsdelivr.net", html)
        self.assertIn('src="vendor/markdown/marked.umd.js"', html)
        self.assertIn('src="vendor/markdown/purify.min.js"', html)
        self.assertIn('src="vendor/markdown/highlight.min.js"', html)
        self.assertIn('href="vendor/markdown/github.min.css"', html)

        for name in (
            "marked.umd.js",
            "purify.min.js",
            "highlight.min.js",
            "github.min.css",
        ):
            path = VENDOR_DIR / name
            self.assertTrue(path.exists(), f"missing vendored asset: {path}")
            self.assertGreater(path.stat().st_size, 0, f"empty vendored asset: {path}")

    def test_frontend_surfaces_context_and_cache_stats(self) -> None:
        src = _frontend_source()

        self.assertIn("formatContextStats", src)
        self.assertIn("context_original_chars", src)
        self.assertIn("cache_hit_tokens", src)

    def test_static_js_is_served_with_revalidation_header(self) -> None:
        with tempfile.TemporaryDirectory() as tmp:
            static_dir = Path(tmp)
            (static_dir / "app.js").write_text("export const ok = true;\n", encoding="utf-8")
            app = FastAPI()
            app.mount("/static", NoCacheStaticFiles(directory=str(static_dir)), name="static")
            client = TestClient(app)

            resp = client.get("/static/app.js")

        self.assertEqual(resp.status_code, 200)
        self.assertEqual(resp.headers.get("cache-control"), "no-cache")


if __name__ == "__main__":
    unittest.main()