/**
 * Lightweight in-memory mock of the Nest API for UI preview when Postgres isn't configured.
 * Serves the public and admin endpoints used by the landing and the admin panel.
 * Requires `npm run build:shared` first (reads defaults from packages/shared/dist).
 */
import http from "node:http";
import { createRequire } from "node:module";

const require = createRequire(import.meta.url);
const { DEFAULT_SECTIONS, SECTION_KEYS } = require("../packages/shared/dist/index.js");

let settings = {
  id: "default",
  brandName: "منتک",
  tagline: "هوش‌افزار منظر",
  email: "info@montech.ir",
  phone: "۰۹۱۲ ۳۴۵ ۶۷۸۹",
  address: "تهران، ایران",
  timezone: "Asia/Tehran",
  logoUrl: null,
  socials: [
    { label: "تلگرام", url: "#" },
    { label: "لینکدین", url: "#" },
    { label: "اینستاگرام", url: "#" },
  ],
};

const sections = Object.fromEntries(SECTION_KEYS.map((k) => [k, structuredClone(DEFAULT_SECTIONS[k])]));

const pages = [
  { id: "p1", key: "home", title: "خانه", seo: { title: "منتک | هوش‌افزار منظر - پلتفرم راهکارهای نرم‌افزاری و هوش مصنوعی", description: "با کمک هوش مصنوعی منتک، بهترین نرم‌افزارها و خدمات متناسب با کسب‌وکار شما پیشنهاد می‌شود.", canonical: "http://localhost:3000/", ogImage: null, noIndex: false } },
  { id: "p2", key: "blog", title: "بلاگ", seo: { title: "بلاگ — منتک", description: "یادداشت‌هایی درباره محصول، مهندسی و ساخت نرم‌افزار.", canonical: "http://localhost:3000/blog", ogImage: null, noIndex: false } },
  { id: "p3", key: "gallery", title: "گالری", seo: { title: "گالری — منتک", description: "تصاویر منتخب از پروژه‌ها و فضای استودیو منتک.", canonical: "http://localhost:3000/gallery", ogImage: null, noIndex: false } },
];

const now = new Date().toISOString();
let blog = [
  {
    id: "b1",
    slug: "welcome-to-montech",
    title: "به منتک خوش آمدید",
    excerpt: "ما نرم‌افزاری می‌سازیم که واقعاً کار می‌کند — و اینجا درباره‌اش می‌نویسیم.",
    content: "منتک یک گروه توسعه نرم‌افزار است که پلتفرم وب، اپلیکیشن موبایل و زیرساخت ابری می‌سازد.\n\nدر این بلاگ درباره ساخت محصول، مهندسی و درس‌آموخته‌های استودیو می‌نویسیم.",
    coverUrl: null,
    published: true,
    publishedAt: now,
    seoTitle: "به منتک خوش آمدید — بلاگ",
    seoDesc: "معرفی منتک و نحوه ساخت نرم‌افزار در تیم ما.",
    ogImage: null,
    canonical: null,
    createdAt: now,
    updatedAt: now,
  },
];
let gallery = [];
let media = [];
let leads = [];
let seq = 1;
const id = (p) => `${p}${Date.now().toString(36)}${seq++}`;

const port = Number(process.env.PORT || 3050);

function readBody(req) {
  return new Promise((resolve) => {
    let raw = "";
    req.on("data", (c) => (raw += c));
    req.on("end", () => {
      try {
        resolve(raw ? JSON.parse(raw) : {});
      } catch {
        resolve({});
      }
    });
  });
}

const server = http.createServer(async (req, res) => {
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.setHeader("Access-Control-Allow-Methods", "GET,POST,PUT,PATCH,DELETE,OPTIONS");
  res.setHeader("Access-Control-Allow-Headers", "Content-Type,Authorization");
  if (req.method === "OPTIONS") {
    res.writeHead(204);
    res.end();
    return;
  }

  const url = new URL(req.url || "/", "http://localhost");
  const path = url.pathname;
  const m = req.method;
  const json = (data, code = 200) => {
    res.writeHead(code, { "Content-Type": "application/json; charset=utf-8" });
    res.end(JSON.stringify(data));
  };
  const seg = path.split("/").filter(Boolean);

  if (path === "/api/health") return json({ ok: true, mock: true });

  // public
  if (m === "GET" && path === "/api/public/site") return json({ settings, sections, pages });
  if (m === "GET" && path === "/api/public/blog") return json(blog.filter((p) => p.published));
  if (m === "GET" && path.startsWith("/api/public/blog/")) {
    const post = blog.find((p) => p.slug === decodeURIComponent(seg[3] || "") && p.published);
    return post ? json(post) : json({ message: "Not found" }, 404);
  }
  if (m === "GET" && path === "/api/public/gallery") return json(gallery.filter((g) => g.published !== false));
  if (m === "GET" && path.startsWith("/api/public/pages/")) {
    const page = pages.find((p) => p.key === decodeURIComponent(seg[3] || ""));
    return page ? json(page) : json({ message: "Not found" }, 404);
  }
  if (m === "POST" && path === "/api/public/leads") {
    const body = await readBody(req);
    const phone = String(body.phone || "").replace(/[۰-۹]/g, (d) => String(d.charCodeAt(0) - 0x06f0)).replace(/[\s\-()]/g, "");
    if (!body.name || String(body.name).trim().length < 2 || !/^\+?\d{7,15}$/.test(phone) || !body.businessType) {
      return json({ message: ["validation failed"] }, 400);
    }
    const lead = { id: id("l"), name: String(body.name).trim(), phone, businessType: body.businessType, source: body.source || "consult", aiQuery: body.aiQuery || null, status: "new", note: null, createdAt: new Date().toISOString(), updatedAt: new Date().toISOString() };
    leads.unshift(lead);
    return json({ id: lead.id, createdAt: lead.createdAt }, 201);
  }

  // auth
  if (m === "POST" && path === "/api/auth/login") {
    return json({ accessToken: "mock-token", admin: { id: "a1", mobile: "09121234567", name: "مدیر منتک" } });
  }
  if (path.startsWith("/api/admin") || path === "/api/auth/me") {
    if (req.headers.authorization !== "Bearer mock-token") return json({ message: "Unauthorized" }, 401);
  }
  if (m === "GET" && path === "/api/auth/me") return json({ id: "a1", mobile: "09121234567", name: "مدیر منتک" });

  // admin
  if (path === "/api/admin/settings") {
    if (m === "GET") return json(settings);
    if (m === "PUT") {
      settings = { ...settings, ...(await readBody(req)) };
      sections.footer = { ...sections.footer, email: settings.email, phone: settings.phone, address: settings.address };
      return json(settings);
    }
  }
  if (m === "GET" && path === "/api/admin/sections") {
    return json(SECTION_KEYS.map((key) => ({ key, data: sections[key], updatedAt: now, isDefault: false })));
  }
  if (seg[1] === "admin" && seg[2] === "sections" && seg[3]) {
    const key = seg[3];
    if (!SECTION_KEYS.includes(key)) return json({ message: "Unknown section" }, 400);
    if (m === "GET") return json({ key, data: sections[key], updatedAt: now, isDefault: false, defaults: DEFAULT_SECTIONS[key] });
    if (m === "PUT") {
      const body = await readBody(req);
      sections[key] = body.data;
      return json({ key, data: sections[key] });
    }
  }
  if (path === "/api/admin/leads" && m === "GET") {
    const status = url.searchParams.get("status");
    const page = Number(url.searchParams.get("page") || 1);
    const pageSize = Number(url.searchParams.get("pageSize") || 20);
    const filtered = status ? leads.filter((l) => l.status === status) : leads;
    return json({ items: filtered.slice((page - 1) * pageSize, page * pageSize), total: filtered.length, page, pageSize, newCount: leads.filter((l) => l.status === "new").length });
  }
  if (seg[1] === "admin" && seg[2] === "leads" && seg[3]) {
    const idx = leads.findIndex((l) => l.id === seg[3]);
    if (idx < 0) return json({ message: "Not found" }, 404);
    if (m === "PATCH") {
      leads[idx] = { ...leads[idx], ...(await readBody(req)), updatedAt: new Date().toISOString() };
      return json(leads[idx]);
    }
    if (m === "DELETE") return json(leads.splice(idx, 1)[0]);
  }
  if (path === "/api/admin/pages" && m === "GET") return json(pages);
  if (seg[1] === "admin" && seg[2] === "pages" && seg[4] === "seo" && m === "PUT") {
    const page = pages.find((p) => p.key === seg[3]);
    if (!page) return json({ message: "Not found" }, 404);
    page.seo = { ...page.seo, ...(await readBody(req)) };
    return json(page.seo);
  }
  if (path === "/api/admin/blog") {
    if (m === "GET") return json(blog);
    if (m === "POST") {
      const body = await readBody(req);
      const post = { id: id("b"), createdAt: new Date().toISOString(), updatedAt: new Date().toISOString(), publishedAt: body.published ? new Date().toISOString() : null, ...body };
      blog.unshift(post);
      return json(post, 201);
    }
  }
  if (seg[1] === "admin" && seg[2] === "blog" && seg[3]) {
    const idx = blog.findIndex((p) => p.id === seg[3]);
    if (idx < 0) return json({ message: "Not found" }, 404);
    if (m === "GET") return json(blog[idx]);
    if (m === "PUT") {
      blog[idx] = { ...blog[idx], ...(await readBody(req)), updatedAt: new Date().toISOString() };
      return json(blog[idx]);
    }
    if (m === "DELETE") return json(blog.splice(idx, 1)[0]);
  }
  if (path === "/api/admin/gallery") {
    if (m === "GET") return json(gallery);
    if (m === "POST") {
      const item = { id: id("g"), published: true, sortOrder: 0, ...(await readBody(req)) };
      gallery.push(item);
      return json(item, 201);
    }
  }
  if (seg[1] === "admin" && seg[2] === "gallery" && seg[3]) {
    const idx = gallery.findIndex((g) => g.id === seg[3]);
    if (idx < 0) return json({ message: "Not found" }, 404);
    if (m === "PUT") {
      gallery[idx] = { ...gallery[idx], ...(await readBody(req)) };
      return json(gallery[idx]);
    }
    if (m === "DELETE") return json(gallery.splice(idx, 1)[0]);
  }
  if (path === "/api/admin/media" && m === "GET") return json(media);
  if (path === "/api/admin/media/upload" && m === "POST") {
    req.resume();
    const item = { id: id("m"), filename: "mock-upload.png", url: "/brand/logo.svg", mimeType: "image/svg+xml", size: 1024, createdAt: new Date().toISOString() };
    media.unshift(item);
    return json(item, 201);
  }
  if (seg[1] === "admin" && seg[2] === "media" && seg[3] && m === "DELETE") {
    media = media.filter((x) => x.id !== seg[3]);
    return json({ ok: true });
  }

  json({ message: `Mock API — no route for ${m} ${path}` }, 404);
});

server.listen(port, "127.0.0.1", () => {
  console.log(`[mock-api] http://127.0.0.1:${port}`);
});