import { createHash } from 'node:crypto';
import sharp from 'sharp';
import {
  CREATE_FILE,
  CREATE_ATTACHMENT,
  GET_NEXT_SORT,
} from '../../sql/manifestattachment.js';
import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
import resolveManifestAccess from './resolveManifestAccess.js';
import request from '../request.js';

export default function add(pool) {
  const access = resolveSelectedCompanyAccess(pool);
  const manifestAccess = resolveManifestAccess(pool);

  /**
   * Attaches a file to an existing manifest.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {number} manifestId - The id of the manifest.
   * @param {object} input - The file data.
   * @param {string} input.mimetype - The MIME type of the file (e.g. `'application/pdf'`).
   * @param {string} input.name - The file name.
   * @param {Buffer} input.content - The file content.
   * @param {number} [input.sort] - Optional display sort order.
   * @param {number} [input.size] - Optional file size in bytes (defaults to content length).
   * @param {Date|string} [input.created] - Optional creation timestamp (defaults to current date).
   * @param {Date|string} [input.modified] - Optional modified timestamp (defaults to created date).
   * @param {string} [input.hash] - The file hash (auto-computed SHA-256 if omitted).
   * @param {Buffer} [input.thumbavif] - Optional AVIF thumbnail buffer.
   * @param {number} [input.thumbx] - Optional thumbnail width.
   * @param {number} [input.thumby] - Optional thumbnail height.
   * @param {object} [input.meta] - Optional string key/value metadata stored on the file row.
   * @returns {Promise<{id: number, manifestId: number, fileId: number, sort: number, hash: string, mimetype: string, name: string, size: number, created: Date, modified: Date, thumbavif: Buffer|null, thumbx: number|null, thumby: number|null, meta: object|null}>} The created attachment record.
   * @throws {Error} If the manifest is not found or file input is invalid.
   *
   * @example
   * const attachment = await store.manifestattachment.add(42, 1, {
   *   mimetype: 'application/pdf',
   *   name: 'invoice.pdf',
   *   content: fileBuffer,
   * });
   * // => { id, manifestId, fileId, sort, hash, mimetype, name, size, created, modified, thumbavif, thumbx, thumby }
   */
  return async (googleAuthId, manifestId, input, ...rest) => {
    let rawMimetype, rawName, rawContent, rawHash, rawThumbavif, rawThumbx, rawThumby, rawSort, rawSize, rawCreated, rawModified, rawMeta;
    if (typeof input === 'object' && input !== null && !Buffer.isBuffer(input)) {
      rawMimetype = input.mimetype;
      rawName = input.name;
      rawContent = input.content;
      rawHash = input.hash;
      rawThumbavif = input.thumbavif;
      rawThumbx = input.thumbx ?? input.thumbw;
      rawThumby = input.thumby ?? input.thumbh;
      rawSort = input.sort;
      rawSize = input.size;
      rawCreated = input.created ?? input.createdAt;
      rawModified = input.modified ?? input.modifiedAt ?? input.lastModified;
      rawMeta = input.meta;
    } else {
      rawMimetype = input;
      rawName = rest[0];
      rawContent = rest[1];
    }

    const mimetype = typeof rawMimetype === 'string' ? rawMimetype.trim() : null;
    if (!mimetype) {
      throw new Error('Mimetype required');
    }

    const name = typeof rawName === 'string' ? rawName.trim() : null;
    if (!name) {
      throw new Error('File name required');
    }

    if (rawContent == null) {
      throw new Error('Content required');
    }
    const content = Buffer.isBuffer(rawContent)
      ? rawContent
      : Buffer.from(rawContent);

    if (rawSort !== undefined && rawSort !== null) {
      if (!Number.isFinite(rawSort)) {
        throw new Error('Invalid sort');
      }
    }

    const size =
      Number.isFinite(rawSize) && rawSize >= 0
        ? Number(rawSize)
        : content.length;

    const parsedCreated =
      rawCreated instanceof Date && !isNaN(rawCreated)
        ? rawCreated
        : typeof rawCreated === 'string' || typeof rawCreated === 'number'
          ? new Date(rawCreated)
          : null;
    const created = parsedCreated && !isNaN(parsedCreated) ? parsedCreated : new Date();

    const parsedModified =
      rawModified instanceof Date && !isNaN(rawModified)
        ? rawModified
        : typeof rawModified === 'string' || typeof rawModified === 'number'
          ? new Date(rawModified)
          : null;
    const modified = parsedModified && !isNaN(parsedModified) ? parsedModified : created;

    // Simple string key/value metadata; only plain string values are kept.
    let meta = null;
    if (typeof rawMeta === 'object' && rawMeta !== null && !Array.isArray(rawMeta)) {
      meta = {};
      for (const [key, value] of Object.entries(rawMeta)) {
        if (value === undefined || value === null) continue;
        meta[key] = String(value);
      }
      if (Object.keys(meta).length === 0) {
        meta = null;
      }
    }

    const hash =
      typeof rawHash === 'string' && rawHash.trim()
        ? rawHash.trim()
        : createHash('sha256').update(content).digest('hex');

    let thumbavif = rawThumbavif
      ? (Buffer.isBuffer(rawThumbavif) ? rawThumbavif : Buffer.from(rawThumbavif))
      : null;
    let thumbx = Number.isFinite(rawThumbx) ? Number(rawThumbx) : null;
    let thumby = Number.isFinite(rawThumby) ? Number(rawThumby) : null;

    if (thumbavif && (!thumbx || !thumby)) {
      try {
        const meta = await sharp(thumbavif).metadata();
        thumbx = thumbx ?? meta.width ?? null;
        thumby = thumby ?? meta.height ?? null;
      } catch {
        // ignore
      }
    }

    if (!thumbavif) {
      try {
        const thumbResult = await sharp(content)
          .resize(200, 200, { fit: 'inside', withoutEnlargement: true })
          .avif({ effort: 4 })
          .toBuffer({ resolveWithObject: true });
        thumbavif = thumbResult.data;
        thumbx = thumbResult.info.width;
        thumby = thumbResult.info.height;
      } catch {
        thumbavif = null;
        thumbx = null;
        thumby = null;
      }
    }

    const { companyId } = await access(googleAuthId);
    await manifestAccess(companyId, manifestId);

    const tx = pool.transaction();
    await tx.begin();

    try {
      let sort = rawSort;
      if (sort === undefined || sort === null) {
        const sortRes = await request(pool, tx)
          .input('manifestId', manifestId)
          .query(GET_NEXT_SORT);
        sort = sortRes.recordset[0].sort;
      }

      const fileRes = await request(pool, tx)
        .input('hash', hash)
        .input('mimetype', mimetype)
        .input('name', name)
        .input('size', size)
        .input('created', created)
        .input('modified', modified)
        .input('content', content)
        .input('thumbavif', thumbavif)
        .input('thumbx', thumbx)
        .input('thumby', thumby)
        .input('meta', meta === null ? null : JSON.stringify(meta))
        .query(CREATE_FILE);

      const fileId = fileRes.recordset[0].id;

      const attachmentRes = await request(pool, tx)
        .input('manifestId', manifestId)
        .input('fileId', fileId)
        .input('sort', sort)
        .query(CREATE_ATTACHMENT);

      const attachmentId = attachmentRes.recordset[0].id;

      await tx.commit();

      return {
        id: attachmentId,
        manifestId,
        fileId,
        sort,
        hash,
        mimetype,
        name,
        size,
        created,
        modified,
        thumbavif,
        thumbx,
        thumby,
        meta,
      };
    } catch (err) {
      try {
        await tx.rollback();
      } catch {
        // ignore
      }
      throw err;
    }
  };
}