import type { Context, Hono } from "hono";
import { isSafePath, isVersion } from "../bucket/repo.ts";
import { publicRepo } from "../server/db.ts";
import { notFound, type PageContext, pathUrl } from "./layout.ts";

// §28: Kepr 2's addresses. Every move is a 301: none of them will ever point anywhere else.
const PANELS = new Map([
	["issues", "/issues"],
	["builds", "/releases"],
	["archives", "/archives"],
	["trust", ""],
]);
// Accounts, tickets, drafts, feeds, and Koh 2's offer and protocol endpoints (Kepr 2's `protocol.zig`).
const GONE = [
	"/tickets/*",
	"/drafts/*",
	"/join",
	"/cli-auth",
	"/api/cli-auth/*",
	"/api/repos/*",
	"/api/releases/upload",
	"/protocol/*",
	"/feed",
	"/:repo/feed",
];
// §22.1's own routes under `/<repo>/releases/`, which a version would otherwise shadow.
const RELEASE_ROUTES = new Set(["latest", "latest.json", "history.json"]);

/** Registered ahead of the repo page, so `/source` and the gone paths are never taken for repos. */
export function registerKepr2Routes(app: Hono, ctx: PageContext): void {
	// §20: a move of a private or unknown repo would reveal it, so it 404s like every repo route.
	const moved = (c: Context, rest: string) => {
		const repo = c.req.param("repo") ?? "";
		if (!publicRepo(ctx.kepr, repo)) return notFound(c, ctx);
		return c.redirect(`/${encodeURIComponent(repo)}${rest}`, 301);
	};
	for (const path of GONE) app.all(path, (c) => c.text("Gone", 410));
	app.get("/source", (c) => c.redirect("/kepr", 301));
	app.get("/:repo", async (c, next) => {
		const panel = PANELS.get(c.req.query("panel") ?? "");
		if (panel === undefined) return next();
		return moved(c, panel);
	});
	app.get("/:repo/releases/:version", async (c, next) => {
		const version = c.req.param("version");
		if (RELEASE_ROUTES.has(version)) return next();
		if (!isVersion(version)) return notFound(c, ctx);
		return moved(c, `/releases#${version}`);
	});
	app.get("/:repo/file", (c) => {
		const path = c.req.query("path") ?? "";
		if (!isSafePath(path)) return notFound(c, ctx);
		return moved(c, `/files/${pathUrl(path)}`);
	});
	app.get("/:repo/bundle", (c) => moved(c, "/archive/HEAD.tar.gz"));
	app.get("/:repo/bundle.blake3", (c) => moved(c, "/archive/HEAD.tar.gz"));
}