import { addonsJs, bootGuardJs, i18nJs, localeEn, localeZh, localeEnJs, localeZhJs, tasksJs, calendarJs, i18nRenderersJs, indexHtml, manifest, serviceWorker, icon } from "./assets.js";

const BING_ARCHIVE = "https://www.bing.com/HPImageArchive.aspx?format=js&idx=0&n=1&mkt=en-US";
const STATE_FIELDS = ["profile", "memories", "museum", "settings", "system"];

async function bingMetadata() {
  const response = await fetch(BING_ARCHIVE, { headers: { accept: "application/json" } });
  if (!response.ok) throw new Error(`Bing metadata request failed: ${response.status}`);
  const image = (await response.json()).images?.[0];
  if (!image?.url) throw new Error("Bing did not return today's image");
  return { title: image.copyright || "Bing Daily Image", url: new URL(image.url, "https://www.bing.com").toString() };
}

function headers(type, cache = "public, max-age=3600") { return { "content-type": type, "cache-control": cache }; }
function userId(request) { return request.headers.get("oai-authenticated-user-id"); }

function loginPage(request) {
  const language = request.headers.get("accept-language")?.toLowerCase().startsWith("zh") ? localeZh : localeEn;
  const text = language.login;
  const escape = (value) => String(value).replace(/[&<>"']/g, (char) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", "\"": "&quot;", "'": "&#39;" }[char]));
  return `<!doctype html><html lang="${language === localeZh ? "zh-CN" : "en"}"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Life OS</title><style>html,body{margin:0;min-height:100%;font-family:ui-sans-serif,system-ui,sans-serif;background:#121513;color:#f4f6f1}body{display:grid;place-items:center;padding:24px;box-sizing:border-box}.panel{width:min(430px,100%);border:1px solid #414942;border-radius:22px;padding:34px;background:#1a201b;box-shadow:0 28px 70px #0008}.mark{font:600 11px ui-monospace,monospace;letter-spacing:.2em;color:#b8ff3d}.title{font-size:36px;letter-spacing:-.06em;margin:18px 0 10px}.copy{color:#afb9b1;line-height:1.65;margin:0 0 26px}.sign{display:flex;align-items:center;justify-content:center;text-decoration:none;background:#b8ff3d;color:#11170d;padding:14px 18px;border-radius:12px;font-size:14px;font-weight:700}.fine{margin:18px 0 0;color:#7e8a81;font:11px ui-monospace,monospace;letter-spacing:.04em;text-align:center}</style></head><body><main class="panel"><div class="mark">LIFE OS</div><h1 class="title">${text.title}</h1><p class="copy">${escape(text.description)}</p><a class="sign" href="/signin-with-chatgpt?return_to=/" target="_top">${escape(text.continue)}</a><p class="fine">${escape(text.footnote)}</p></main></body></html>`;
}

function validState(value) { return value && typeof value === "object" && !Array.isArray(value) && STATE_FIELDS.every((field) => Object.hasOwn(value, field)); }
function stateFromRow(row) { return row ? Object.fromEntries(STATE_FIELDS.map((field) => [field, JSON.parse(row[`${field}_json`])])) : null; }

async function stateApi(request, env, id) {
  if (!id) return Response.json({ error: "Authentication required" }, { status: 401 });
  if (!env.DB) return Response.json({ error: "Cloud storage is unavailable" }, { status: 503 });
  try {
    if (request.method === "GET") {
      const row = await env.DB.prepare("SELECT profile_json, memories_json, museum_json, settings_json, system_json, updated_at FROM lifeos_states WHERE user_id = ?").bind(id).first();
      return Response.json({ state: stateFromRow(row), updatedAt: row?.updated_at ?? null }, { headers: { "cache-control": "no-store" } });
    }
    if (request.method === "PUT") {
      const payload = await request.json();
      if (!validState(payload?.state)) return Response.json({ error: "Invalid Life OS state" }, { status: 400 });
      const state = payload.state;
      const serialized = STATE_FIELDS.map((field) => JSON.stringify(state[field]));
      if (serialized.some((value) => value.length > 1_000_000)) return Response.json({ error: "Life OS state is too large" }, { status: 413 });
      const updatedAt = new Date().toISOString();
      await env.DB.prepare("INSERT INTO lifeos_states (user_id, profile_json, memories_json, museum_json, settings_json, system_json, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?) ON CONFLICT(user_id) DO UPDATE SET profile_json = excluded.profile_json, memories_json = excluded.memories_json, museum_json = excluded.museum_json, settings_json = excluded.settings_json, system_json = excluded.system_json, updated_at = excluded.updated_at").bind(id, ...serialized, updatedAt).run();
      return Response.json({ ok: true, updatedAt }, { headers: { "cache-control": "no-store" } });
    }
    return Response.json({ error: "Method not allowed" }, { status: 405, headers: { allow: "GET, PUT" } });
  } catch (error) {
    return Response.json({ error: "Cloud storage request failed", detail: String(error) }, { status: 500 });
  }
}

export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    const id = userId(request);
    if (url.pathname === "/api/lifeos-state") return stateApi(request, env, id);
    try {
      if (url.pathname === "/api/bing-wallpaper") return Response.json(await bingMetadata(), { headers: { "cache-control": "public, max-age=3600" } });
      if (url.pathname === "/api/bing-wallpaper-image") {
        const image = await bingMetadata();
        const response = await fetch(image.url);
        if (!response.ok) throw new Error(`Bing image request failed: ${response.status}`);
        return new Response(response.body, { headers: headers(response.headers.get("content-type") || "image/jpeg", "public, max-age=21600") });
      }
    } catch (error) {
      return Response.json({ error: "Bing wallpaper is temporarily unavailable", detail: String(error) }, { status: 502 });
    }
    if (url.pathname === "/addons.js") return new Response(addonsJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/service-worker.js") return new Response(serviceWorker, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/manifest.webmanifest") return new Response(manifest, { headers: headers("application/manifest+json; charset=utf-8", "no-cache") });
    if (url.pathname === "/life-os-icon.svg") return new Response(icon, { headers: headers("image/svg+xml", "public, max-age=86400") });
    if (url.pathname === "/boot-guard.js") return new Response(bootGuardJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/i18n.js") return new Response(i18nJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/locales/en.js") return new Response(localeEnJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/locales/zh-CN.js") return new Response(localeZhJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/tasks.js") return new Response(tasksJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/calendar.js") return new Response(calendarJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/i18n-renderers.js") return new Response(i18nRenderersJs, { headers: headers("application/javascript; charset=utf-8", "no-cache") });
    if (url.pathname === "/" || url.pathname === "/index.html") {
      if (!id) return new Response(loginPage(request), { headers: headers("text/html; charset=utf-8", "no-cache") });
      return new Response(indexHtml, { headers: headers("text/html; charset=utf-8", "no-cache") });
    }
    return new Response("Not found", { status: 404 });
  },
};