/**
 * @file artifacts.js (routes)
 * @description `/api/artifacts` — the Artifacts hub (server/lib/artifacts.js):
 * list, add (a claude.ai page, a pinned workspace file or an uploaded one, a
 * skill — picked, uploaded (file, folder, zip) or written —, a plugin, after
 * reading its marketplace's plugin list from a link),
 * rename/share/unshare, delete, read a snapshot file (preview/download, under
 * a `sandbox` CSP with `nosniff`, so nothing shared runs on the dashboard's
 * origin), and install a shared skill or plugin into the caller's own
 * account. Every write is same-origin. A path in a request only ever names a
 * file inside a workspace (pin, under the read path's guards) or one of a
 * snapshot's own recorded files.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const express = require("express");
const fs = require("node:fs");
const artifacts = require("../lib/artifacts");
const { sameOriginGuard } = require("./run");
const { broadcast } = require("../websocket");

const router = express.Router();

const STATUS = {
  ENOTFOUND: 404,
  ENOLANE: 404,
  ENOFILE: 404,
  EFORBIDDEN: 403,
  ESECRET: 403,
  EFOREIGN: 403,
  EINSTALLSOFF: 403,
  EEXISTS: 409,
  ENOACCOUNT: 409,
  EUPGRADE: 409,
  ENOTSHARED: 409,
  EPLUGIN: 502,
  EMARKETFETCH: 502,
  ENEEDLOGIN: 502,
  ETOOBIG: 413,
};

function sendError(res, err) {
  if (err && typeof err.code === "string" && /^E[A-Z]+$/.test(err.code)) {
    return res
      .status(STATUS[err.code] || 400)
      .json({ error: { code: err.code, message: err.message } });
  }
  console.warn("[artifacts]", err);
  return res.status(500).json({ error: { code: "EINTERNAL", message: String(err?.message || err) } });
}

/** Tell clients a row changed: everyone when shared, else its owner (+ staff). */
function changed(row) {
  if (!row) return;
  broadcast("artifact_changed", { id: row.id, ownerId: row.ownerId ?? row.owner_id ?? null, shared: !!(row.shared === true || row.shared === 1) });
}

const wrap = (fn) => async (req, res) => {
  try {
    await fn(req, res);
  } catch (err) {
    sendError(res, err);
  }
};

router.get(
  "/",
  wrap((req, res) => {
    const q = req.query;
    res.json({
      items: artifacts.list(req, {
        scope: q.scope,
        kind: q.kind || undefined,
        q: q.q,
        laneId: q.laneId,
        sessionId: q.sessionId,
      }),
    });
  })
);

router.get(
  "/settings",
  wrap((req, res) => {
    const server = require("../lib/auth").isServerMode();
    res.json({
      serverMode: server,
      canShare: server,
      installsEnabled: artifacts.installsEnabled(),
      canManage: !req.user || req.user.role === "admin",
    });
  })
);

router.put(
  "/settings",
  sameOriginGuard,
  wrap((req, res) => {
    if (req.user && req.user.role !== "admin") {
      return res.status(403).json({ error: { code: "EADMIN", message: "admin only" } });
    }
    const on = req.body?.installsEnabled;
    if (typeof on !== "boolean") {
      return res.status(400).json({ error: { code: "EBADFIELD", message: "installsEnabled: boolean" } });
    }
    artifacts.setInstallsEnabled(on);
    if (req.user) {
      require("../lib/audit").recordAccountChange(
        req.user.id,
        null,
        "PUT",
        `artifact hub installs ${on ? "on" : "off"}`
      );
    }
    res.json({ installsEnabled: artifacts.installsEnabled() });
  })
);

router.get(
  "/candidates",
  wrap((req, res) => res.json({ items: artifacts.fileCandidates(req.query.laneId) }))
);

router.get(
  "/skills",
  wrap((req, res) => res.json({ items: artifacts.availableSkills(req, req.query.laneId) }))
);

router.post(
  "/page",
  sameOriginGuard,
  wrap((req, res) => {
    const item = artifacts.addPage(req, req.body || {});
    changed(item);
    res.status(201).json({ item });
  })
);

router.post(
  "/file",
  sameOriginGuard,
  wrap(async (req, res) => {
    const item = await artifacts.pinFile(req, req.body || {});
    changed(item);
    res.status(201).json({ item });
  })
);

router.post(
  "/skill",
  sameOriginGuard,
  wrap((req, res) => {
    const item = artifacts.addSkill(req, req.body || {});
    changed(item);
    res.status(201).json({ item });
  })
);

// Read a marketplace (a git link, owner/repo, or a marketplace.json link)
// and list its plugins to pick from. A POST: it reaches the network.
router.post(
  "/plugin/inspect",
  sameOriginGuard,
  wrap(async (req, res) => res.json(await artifacts.inspectMarket(req.body?.market)))
);

// A skill written in the dialog: {name, description, content, title?}.
router.post(
  "/skill/new",
  sameOriginGuard,
  wrap((req, res) => {
    const item = artifacts.writeSkill(req, req.body || {});
    changed(item);
    res.status(201).json({ item, items: [item] });
  })
);

/** multer, in memory, for one upload route; errors answered like ours. */
function upload(limits) {
  return (req, res, next) => {
    const multer = require("multer");
    multer({ storage: multer.memoryStorage(), limits }).array("files")(req, res, (err) => {
      if (!err) return next();
      const big = err.code === "LIMIT_FILE_SIZE" || err.code === "LIMIT_FILE_COUNT";
      return res.status(big ? 413 : 400).json({
        error: { code: big ? "ETOOBIG" : "EBADUPLOAD", message: err.message },
      });
    });
  };
}

/** Each uploaded file with the relative path the browser sent in `paths` (a folder pick keeps it). */
function uploads(req) {
  let paths = [];
  try {
    paths = JSON.parse(req.body?.paths || "[]");
  } catch {
    paths = [];
  }
  return (req.files || []).map((f, i) => ({
    path: typeof paths[i] === "string" && paths[i] ? paths[i] : f.originalname,
    data: f.buffer,
  }));
}

// Skills from files: one Markdown file, a folder, several files, a .zip/.skill,
// or several skills at once (server/lib/artifacts.js `skillsFromUpload`).
router.post(
  "/skill/upload",
  sameOriginGuard,
  upload({ files: 400, fileSize: 10 * 1024 * 1024, fields: 10 }),
  wrap((req, res) => {
    const b = req.body || {};
    const items = artifacts.uploadSkills(req, {
      uploads: uploads(req),
      name: b.name,
      title: b.title,
      description: b.description,
    });
    for (const item of items) changed(item);
    res.status(201).json({ items });
  })
);

// One file from the user's computer, kept like a pinned workspace file.
router.post(
  "/file/upload",
  sameOriginGuard,
  upload({ files: 1, fileSize: 25 * 1024 * 1024, fields: 10 }),
  wrap((req, res) => {
    const f = (req.files || [])[0];
    if (!f) {
      return res.status(400).json({ error: { code: "ENOFILE", message: "attach the file as `files`" } });
    }
    const item = artifacts.uploadFile(req, {
      name: f.originalname,
      data: f.buffer,
      title: req.body?.title,
      description: req.body?.description,
    });
    changed(item);
    res.status(201).json({ item });
  })
);

router.post(
  "/plugin",
  sameOriginGuard,
  wrap((req, res) => {
    const item = artifacts.addPlugin(req, req.body || {});
    changed(item);
    res.status(201).json({ item });
  })
);

router.get(
  "/:id",
  wrap((req, res) => res.json({ item: artifacts.view(artifacts.load(req, req.params.id), req) }))
);

router.patch(
  "/:id",
  sameOriginGuard,
  wrap((req, res) => {
    const item = artifacts.update(req, req.params.id, req.body || {});
    changed(item);
    res.json({ item });
  })
);

router.delete(
  "/:id",
  sameOriginGuard,
  wrap((req, res) => {
    const row = artifacts.remove(req, req.params.id);
    changed(row);
    res.json({ ok: true });
  })
);

// One recorded file of a snapshot. Always sandboxed; `?download=1` makes it
// an attachment. The type is only ever one of a fixed list, else a download.
const TYPES = {
  html: "text/html; charset=utf-8",
  htm: "text/html; charset=utf-8",
  md: "text/plain; charset=utf-8",
  markdown: "text/plain; charset=utf-8",
  txt: "text/plain; charset=utf-8",
  log: "text/plain; charset=utf-8",
  csv: "text/plain; charset=utf-8",
  tsv: "text/plain; charset=utf-8",
  json: "text/plain; charset=utf-8",
  yaml: "text/plain; charset=utf-8",
  yml: "text/plain; charset=utf-8",
  sh: "text/plain; charset=utf-8",
  py: "text/plain; charset=utf-8",
  js: "text/plain; charset=utf-8",
  ts: "text/plain; charset=utf-8",
  png: "image/png",
  jpg: "image/jpeg",
  jpeg: "image/jpeg",
  gif: "image/gif",
  webp: "image/webp",
  svg: "image/svg+xml",
  pdf: "application/pdf",
  mp4: "video/mp4",
  webm: "video/webm",
  mp3: "audio/mpeg",
  wav: "audio/wav",
};

router.get(
  "/:id/raw",
  wrap((req, res) => {
    const { abs, name } = artifacts.snapshotFile(req, req.params.id, req.query.path);
    const ext = name.split(".").pop().toLowerCase();
    const type = TYPES[ext];
    const download = req.query.download === "1" || !type;
    res.set({
      "Content-Type": download ? "application/octet-stream" : type,
      "Content-Security-Policy": "default-src 'none'; img-src data:; style-src 'unsafe-inline'; media-src 'self'; sandbox",
      "X-Content-Type-Options": "nosniff",
      "Cache-Control": "private, max-age=60",
      ...(download
        ? { "Content-Disposition": `attachment; filename*=UTF-8''${encodeURIComponent(name)}` }
        : {}),
    });
    fs.createReadStream(abs)
      .on("error", () => res.destroy())
      .pipe(res);
  })
);

router.post(
  "/:id/install",
  sameOriginGuard,
  wrap(async (req, res) => {
    const result = await artifacts.install(req, req.params.id, {
      replace: req.body?.replace === true,
    });
    res.json(result);
  })
);

module.exports = router;