import type { Hono } from "hono";
import { fileAt, headId, history, type Save, saveByPrefix } from "../mirror/queries.ts";
import { type Html, html } from "./html.ts";
import {
	cacheFor,
	notFound,
	openPublicRepo,
	type PageContext,
	type PublicRepo,
	page,
	relativeTime,
} from "./layout.ts";

const RECENT = 20;

export function registerArchivesPage(app: Hono, ctx: PageContext): void {
	app.get("/:repo/archives", (c) => {
		const repo = openPublicRepo(ctx, c.req.param("repo"));
		if (!repo) return notFound(c, ctx);
		const name = repo.settings.name;
		const id = headId(repo.mirror);
		const head = id ? saveByPrefix(repo.mirror, id) : null;
		const recent = history(repo.mirror, RECENT + 1, 0).filter((save) => save.id !== head?.id);
		cacheFor(c, false);
		return c.html(
			page(ctx, {
				title: `archives · ${name}`,
				description: `Source tarballs of ${name}, one per save.`,
				path: `/${name}/archives`,
				body: html`<p class="breadcrumb mono"><a href="/${name}">${name}</a></p>
<h1 class="file-page-title">archives</h1>
<section class="repo-section">
${
	head
		? [
				row(ctx, repo, head, true),
				...recent.slice(0, RECENT).map((save) => row(ctx, repo, save, false)),
			]
		: html`<p class="muted mono save-empty">no saves yet</p>`
}
</section>`,
			}),
		);
	});
}

// HEAD's row names HEAD.tar.gz, which always follows the newest save; the others pin their save.
// The `nix profile add` line shows only where the save has a flake to install, as in Kepr 2.
function row(ctx: PageContext, repo: PublicRepo, save: Save, isHead: boolean): Html {
	const name = repo.settings.name;
	const file = isHead ? "HEAD" : save.id;
	const tarball = `/${name}/archive/${file}.tar.gz`;
	const nix = `nix profile add https://${ctx.domain}${tarball}`;
	const curl = `curl -fL https://${ctx.domain}${tarball} | tar xz`;
	const koh = `koh steal ${ctx.domain}/${name}`;
	const hasFlake = fileAt(repo.mirror, save.id, "flake.nix") !== null;
	// HEAD can be a checkpoint, which has no page of its own (§21.4).
	const id = save.is_checkpoint
		? html`<span class="history-id">${save.id}</span>`
		: html`<a class="history-id" href="/${name}/saves/${save.id}">${save.id}</a>`;
	return html`<div class="archive-row${isHead ? " archive-row--head" : ""}">
<p class="archive-save">${
		isHead && html`<span class="archive-head mono">HEAD</span>`
	}${id}${html`<span class="history-msg archive-msg">${save.message.split("\n")[0]}</span>`}${html`<span class="history-when">${relativeTime(save.created_at)}</span>`}</p>
<p class="archive-links mono"><a href="${
		tarball
	}">↓ ${name}-${isHead ? "HEAD" : save.id.slice(0, 8)}.tar.gz</a>
<button type="button" class="copy-btn" data-copy="${save.id}"
aria-label="copy save ${save.id}" hidden>hash</button>
<button type="button" class="copy-btn" data-copy="${koh}"
aria-label="copy Koh steal command" hidden>koh</button>
<button type="button" class="copy-btn" data-copy="${curl}"
aria-label="copy archive download command" hidden>curl</button></p>
${
	hasFlake &&
	html`<div class="install-line"><code>${nix}</code><button type="button" class="copy-btn" data-copy="${nix}" hidden>copy</button></div>`
}
</div>`;
}