// services/chibisafe.service.js
//
// Wraps the Chibisafe REST API.
//
// Environment variables expected:
//   CHIBISAFE_BASE_URL        – e.g. https://cdn.yourdomain.com
//   CHIBISAFE_API_KEY         – your personal / service-account API key
//   CHIBISAFE_ALBUM_AVATARS   – album UUID for avatar images
//   CHIBISAFE_ALBUM_VIDEOS    – album UUID for videos
//   CHIBISAFE_ALBUM_DOCUMENTS – album UUID for documents (pdf, docx, ppt, txt…)
//   CHIBISAFE_ALBUM_THUMBNAILS – album UUID for video thumbnails
//   CHIBISAFE_ALBUM_ARCHIVED  – album UUID used as the "trash" / archived album

const FormData = require("form-data");
const axios    = require("axios");

// ─── Config ───────────────────────────────────────────────────────────────────

const BASE_URL = (process.env.CHIBISAFE_BASE_URL || "").replace(/\/$/, "");
const API_KEY  = process.env.CHIBISAFE_API_KEY || "";

const ALBUMS = {
  avatars:    process.env.CHIBISAFE_ALBUM_AVATARS    || null,
  videos:     process.env.CHIBISAFE_ALBUM_VIDEOS     || null,
  documents:  process.env.CHIBISAFE_ALBUM_DOCUMENTS  || null,
  thumbnails: process.env.CHIBISAFE_ALBUM_THUMBNAILS || null,
  images:     process.env.CHIBISAFE_ALBUM_IMAGES     || null,   // ← new
  archived:   process.env.CHIBISAFE_ALBUM_ARCHIVED   || null,
};

// ─── Internal helpers ─────────────────────────────────────────────────────────

function resolveAlbumUuid(ownerType = "") {
  switch (ownerType) {
    case "avatar":    return ALBUMS.avatars;
    case "video":     return ALBUMS.videos;
    case "document":  return ALBUMS.documents;
    case "thumbnail": return ALBUMS.thumbnails;
    case "image":     return ALBUMS.images;
    default:          return null;
  }
}

function baseHeaders(extra = {}) {
  return {
    "x-api-key": API_KEY,
    ...extra,
  };
}

// ─── Axios instance ───────────────────────────────────────────────────────────

const chibi = axios.create({
  baseURL:            BASE_URL,
  maxBodyLength:      Infinity,   // ← required for large file uploads
  maxContentLength:   Infinity,
});

/**
 * Thin axios wrapper that throws a descriptive error on non-2xx.
 */
async function chibiRequest(path, { method = "GET", headers = {}, data } = {}) {
  try {
    const res = await chibi.request({
      url: path,
      method,
      headers,
      data,
    });
    return res.data;
  } catch (err) {
    const status   = err.response?.status;
    const body     = err.response?.data ?? {};
    const msg      = body?.message || body?.error || err.message;
    const friendly = new Error(`[Chibisafe] ${status ?? "?"} – ${msg}`);
    friendly.status    = status;
    friendly.chibiBody = body;
    throw friendly;
  }
}

// ─── Public API ───────────────────────────────────────────────────────────────

/**
 * Upload a file to Chibisafe, optionally straight into a typed album.
 */
async function uploadFile({ buffer, originalname, mimetype, ownerType = "" }) {
  if (!BASE_URL || !API_KEY) {
    throw new Error("[Chibisafe] CHIBISAFE_BASE_URL or CHIBISAFE_API_KEY is not configured.");
  }

  const albumUuid = resolveAlbumUuid(ownerType);

  const form = new FormData();
  form.append("file", buffer, {
    filename:    originalname,
    contentType: mimetype,
  });

  const data = await chibiRequest("/api/upload", {
    method:  "POST",
    headers: {
      ...baseHeaders(),
      ...form.getHeaders(),                              // ← axios needs these
      ...(albumUuid ? { albumuuid: albumUuid } : {}),
    },
    data: form,
  });

  return {
    uuid: data.uuid,
    url:  data.url,
    name: data.name,
  };
}

/**
 * Permanently delete one file from Chibisafe by its UUID.
 */
async function deleteFile(uuid) {
  await chibiRequest(`/api/file/${uuid}`, {
    method:  "DELETE",
    headers: baseHeaders(),
  });
}

/**
 * Move one or more files into the "archived" album.
 */
async function archiveFiles(uuids) {
  if (!ALBUMS.archived) {
    throw new Error("[Chibisafe] CHIBISAFE_ALBUM_ARCHIVED is not configured.");
  }

  const ids = Array.isArray(uuids) ? uuids : [uuids];
  if (!ids.length) return;

  await chibiRequest("/api/files/album/add", {
    method:  "POST",
    headers: {
      ...baseHeaders(),
      "Content-Type": "application/json",
    },
    data: {
      files:     ids,
      albumUuid: ALBUMS.archived,
    },
  });
}

/**
 * Move one or more files into a specific album by UUID.
 */
async function addFilesToAlbum(uuids, albumUuid) {
  const ids = Array.isArray(uuids) ? uuids : [uuids];

  await chibiRequest("/api/files/album/add", {
    method:  "POST",
    headers: {
      ...baseHeaders(),
      "Content-Type": "application/json",
    },
    data: {
      files: ids,
      albumUuid,
    },
  });
}

module.exports = {
  uploadFile,
  deleteFile,
  archiveFiles,
  addFilesToAlbum,
  ALBUMS,
  resolveAlbumUuid,
};