const http = require("http");
const fs = require("fs");
const path = require("path");

const PORT = Number(process.env.PORT || 4173);
const WEB_ROOT = path.resolve(__dirname, "../../apps/web");

function clone(value) {
  return JSON.parse(JSON.stringify(value));
}

const baseSpecies = [
  {
    slug: "active-shad",
    source_file: "Active Shad.txt",
    title: "Active Shad (Alosa activa)",
    common_name: "Active Shad",
    scientific_name: "Alosa activa",
    flelmr_code: "1001",
    summary: "An active editor-visible species.",
    section_count: 2,
    publication_status: "published",
    is_archived: false,
    editor_notes: "",
    last_modified_by: "system-import",
    diagnostics: [],
    sections: [
      { id: 1, position: 1, heading: "HEADER", content: "Header content" },
      { id: 2, position: 2, heading: "HABITAT", content: "Habitat content" },
    ],
    audit: [],
  },
  {
    slug: "archived-shad",
    source_file: "Archived Shad.txt",
    title: "Archived Shad (Alosa archiva)",
    common_name: "Archived Shad",
    scientific_name: "Alosa archiva",
    flelmr_code: "1002",
    summary: "An archived species.",
    section_count: 1,
    publication_status: "published",
    is_archived: true,
    editor_notes: "Archived from prior import.",
    last_modified_by: "system-import",
    diagnostics: [],
    sections: [
      { id: 3, position: 1, heading: "HEADER", content: "Archived header" },
    ],
    audit: [
      {
        id: 1,
        changed_by: "system-import",
        changed_at: "2026-03-26T00:00:00+00:00",
        action: "import_archive",
        details: { is_archived: { from: false, to: true } },
      },
    ],
  },
];

let speciesRecords = clone(baseSpecies);

function resetState() {
  speciesRecords = clone(baseSpecies);
}

function getSession(req) {
  const auth = req.headers.authorization || "";
  if (auth === "Bearer editor-token") {
    return {
      authenticated: true,
      auth_configured: true,
      user: { username: "editor", role: "editor" },
    };
  }
  return {
    authenticated: false,
    auth_configured: true,
    user: null,
  };
}

function sendJson(res, status, payload) {
  const body = JSON.stringify(payload);
  res.writeHead(status, {
    "Content-Type": "application/json; charset=utf-8",
    "Content-Length": Buffer.byteLength(body),
  });
  res.end(body);
}

function sendFile(res, filePath) {
  fs.readFile(filePath, (error, content) => {
    if (error) {
      sendJson(res, 404, { error: "Not found" });
      return;
    }
    const ext = path.extname(filePath);
    const type =
      ext === ".html"
        ? "text/html; charset=utf-8"
        : ext === ".js"
          ? "application/javascript; charset=utf-8"
          : "text/css; charset=utf-8";
    res.writeHead(200, { "Content-Type": type });
    res.end(content);
  });
}

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

function getEditorList() {
  return speciesRecords.map((item) => ({
    slug: item.slug,
    title: item.title,
    common_name: item.common_name,
    publication_status: item.publication_status,
    is_archived: item.is_archived,
    last_modified_by: item.last_modified_by,
    diagnostics: item.diagnostics,
  }));
}

const server = http.createServer(async (req, res) => {
  const url = new URL(req.url, `http://${req.headers.host}`);
  const pathname = url.pathname;

  if (pathname === "/__reset" && req.method === "POST") {
    resetState();
    sendJson(res, 200, { status: "ok" });
    return;
  }

  if (pathname === "/api/auth/session" && req.method === "GET") {
    sendJson(res, 200, getSession(req));
    return;
  }

  if (pathname === "/api/insights/summary" && req.method === "GET") {
    sendJson(res, 200, { species_count: 1, section_count: 3, diagnostic_counts: {} });
    return;
  }

  if (pathname === "/api/editor/species" && req.method === "GET") {
    sendJson(res, 200, { items: getEditorList(), count: speciesRecords.length });
    return;
  }

  if (pathname.startsWith("/api/editor/species/") && pathname.endsWith("/audit") && req.method === "GET") {
    const slug = pathname.slice("/api/editor/species/".length, -"/audit".length).replace(/\/$/, "");
    const item = speciesRecords.find((record) => record.slug === slug);
    if (!item) {
      sendJson(res, 404, { error: "Not found" });
      return;
    }
    sendJson(res, 200, { items: item.audit, count: item.audit.length });
    return;
  }

  if (pathname.startsWith("/api/editor/species/") && pathname.endsWith("/editorial") && req.method === "POST") {
    const slug = pathname.slice("/api/editor/species/".length, -"/editorial".length).replace(/\/$/, "");
    const item = speciesRecords.find((record) => record.slug === slug);
    if (!item) {
      sendJson(res, 404, { error: "Not found" });
      return;
    }
    const payload = await parseBody(req);
    const beforeArchived = item.is_archived;
    item.publication_status = payload.publication_status || item.publication_status;
    item.summary = payload.summary ?? item.summary;
    item.editor_notes = payload.editor_notes ?? item.editor_notes;
    item.is_archived = Boolean(payload.is_archived);
    item.last_modified_by = "editor";
    item.audit.unshift({
      id: item.audit.length + 1,
      changed_by: "editor",
      changed_at: "2026-03-26T00:01:00+00:00",
      action: "editorial_update",
      details: {
        is_archived: { from: beforeArchived, to: item.is_archived },
      },
    });
    sendJson(res, 200, {
      status: "ok",
      slug: item.slug,
      summary: item.summary,
      publication_status: item.publication_status,
      editor_notes: item.editor_notes,
      is_archived: item.is_archived,
      last_modified_by: item.last_modified_by,
      changed_fields: {
        is_archived: { from: beforeArchived, to: item.is_archived },
      },
    });
    return;
  }

  if (pathname.startsWith("/api/editor/species/") && req.method === "GET") {
    const slug = pathname.slice("/api/editor/species/".length).replace(/\/$/, "");
    const item = speciesRecords.find((record) => record.slug === slug);
    if (!item) {
      sendJson(res, 404, { error: "Not found" });
      return;
    }
    sendJson(res, 200, item);
    return;
  }

  if (pathname === "/" || pathname === "/index.html") {
    sendFile(res, path.join(WEB_ROOT, "index.html"));
    return;
  }

  if (pathname === "/app.js" || pathname === "/styles.css") {
    sendFile(res, path.join(WEB_ROOT, pathname.slice(1)));
    return;
  }

  sendJson(res, 404, { error: "Not found" });
});

server.listen(PORT, "127.0.0.1", () => {
  process.stdout.write(`UI test server listening on ${PORT}\n`);
});