import type { Database } from "bun:sqlite";
import { join } from "node:path";
import { Hono } from "hono";
import { bodyLimit } from "hono/body-limit";
import { secureHeaders } from "hono/secure-headers";
import { isSafePath } from "../bucket/repo.ts";
import { registerFileRoutes } from "../pages/files.ts";
import { registerRepoPage } from "../pages/repo.ts";
import { registerSavePage } from "../pages/save.ts";
import { registerTarballRoutes } from "../tarball/archive.ts";
import type { Config } from "./config.ts";

const MAX_BODY_BYTES = 64 * 1024;
const PUBLIC_DIR = join(import.meta.dir, "../../public");
// §18 allows Bunny Fonts: its stylesheet and the font files it points at.
const FONTS = "https://fonts.bunny.net";

/** The Hono app with §25's headers and body cap, and every route built so far. */
export function createApp(config: Config, kepr: Database): Hono {
	const app = new Hono();
	// §25 allows images from the presigned host, which is the bucket endpoint's origin.
	const imgSrc =
		config.bucket.kind === "s3" ? ["'self'", new URL(config.bucket.endpoint).origin] : ["'self'"];
	app.use(
		secureHeaders({
			contentSecurityPolicy: {
				defaultSrc: ["'self'"],
				scriptSrc: ["'self'"],
				styleSrc: ["'self'", FONTS],
				fontSrc: [FONTS],
				imgSrc,
				objectSrc: ["'none'"],
				baseUri: ["'none'"],
				formAction: ["'self'"],
				frameAncestors: ["'none'"],
			},
			xFrameOptions: "DENY",
		}),
	);
	app.use(
		bodyLimit({ maxSize: MAX_BODY_BYTES, onError: (c) => c.text("Request body too large", 413) }),
	);
	app.get("/static/:path{.+}", async (c) => {
		const path = c.req.param("path");
		const file = Bun.file(join(PUBLIC_DIR, path));
		if (!isSafePath(path) || !(await file.exists())) return c.notFound();
		c.header("Cache-Control", "public, max-age=3600");
		return c.body(await file.bytes(), 200, { "Content-Type": file.type });
	});
	const ctx = { domain: config.domain, kepr, mirrorDir: join(config.dataDir, "mirror") };
	registerRepoPage(app, ctx);
	registerFileRoutes(app, ctx);
	registerSavePage(app, ctx);
	registerTarballRoutes(app, ctx, join(config.dataDir, "tarballs"));
	return app;
}