import {
  COUNT_MANIFESTS as MSSQL_COUNT_MANIFESTS,
  GET_MANIFEST_LINES_BY_MANIFEST_IDS as MSSQL_LINES_BY_MANIFEST_IDS,
  RETOURE_TYPE as MSSQL_RETOURE_TYPE,
} from '../../providers/mssql/queries/manifestDoc.js';
import {
  COUNT_MANIFESTS as SQLITE_COUNT_MANIFESTS,
  GET_MANIFEST_LINES_BY_MANIFEST_IDS as SQLITE_LINES_BY_MANIFEST_IDS,
  RETOURE_TYPE as SQLITE_RETOURE_TYPE,
} from '../../providers/sqlite3/queries/manifestDoc.js';
import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
import { shapeSummary } from '../manifestDoc/helpers.js';
import { shapeLine } from '../manifestLines.js';
import makeRunner from '../runner.js';

export default function list(provider) {
  const access = resolveSelectedCompanyAccess(provider);
  const isSqlite = provider?.dialect === 'sqlite3';
  const sqlLinesByManifestIds = isSqlite
    ? SQLITE_LINES_BY_MANIFEST_IDS
    : MSSQL_LINES_BY_MANIFEST_IDS;
  const retoureType = isSqlite ? SQLITE_RETOURE_TYPE : MSSQL_RETOURE_TYPE;
  const sqlCountManifests = isSqlite
    ? SQLITE_COUNT_MANIFESTS
    : MSSQL_COUNT_MANIFESTS;

  /**
   * Lists the retoures of the user's selected company.
   *
   * @param {number} googleAuthId - The id of the Google auth user.
   * @param {object} [opts] - Optional pagination and filter options.
   * @param {number} [opts.offset=0] - Number of retoures to skip.
   * @param {number} [opts.limit=50] - Number of retoures to return.
   * @param {string} [opts.search] - Free-text search matching retoure number, external number, or customer name.
   * @param {boolean} [opts.onlyUnpaid=false] - When true, returns only unpaid retoures.
   * @param {boolean} [opts.onlyUndelivered=false] - When true, returns only undelivered retoures.
   * @param {number} [opts.seekMonths] - Negative integer for cutoff months ago (e.g. -1).
   * @param {object} [tx] - Optional transaction.
   * @returns {Promise<{retoures: Array<object>, total: number, unfilteredTotal: number, offset: number, limit: number}|Array<object>>}
   */
  return async (googleAuthId, opts, tx) => {
    let offset = null;
    let limit = null;
    let isPaged = false;
    let resolvedTx = tx;

    const hasFilter = opts != null && typeof opts === 'object' && !opts._isTx && (
      opts.offset !== undefined ||
      opts.limit !== undefined ||
      (typeof opts.search === 'string' && opts.search.trim() !== '') ||
      opts.onlyUnpaid === true ||
      opts.onlyUndelivered === true ||
      opts.entityId !== undefined ||
      opts.seekMonths !== undefined
    );

    if (opts != null && typeof opts === 'object' && !opts._isTx) {
      if (hasFilter || opts.offset !== undefined || opts.limit !== undefined) {
        isPaged = true;
        const parsedOffset = Number(opts.offset ?? 0);
        const parsedLimit = Number(opts.limit ?? 50);
        if (!Number.isInteger(parsedOffset) || parsedOffset < 0) {
          throw new Error('Invalid offset');
        }
        if (!Number.isInteger(parsedLimit) || parsedLimit < 1) {
          throw new Error('Invalid limit');
        }
        offset = parsedOffset;
        limit = parsedLimit;
      }
    } else if (opts != null) {
      resolvedTx = opts;
    }

    const runner = makeRunner(provider, resolvedTx);
    const { companyId } = await access(googleAuthId, runner);

    const conditions = ['m.company_id = @companyId', `m.${isSqlite ? '"type"' : '[type]'} = @type`];
    const params = {
      companyId,
      type: retoureType,
    };

    if (opts?.entityId !== undefined && opts.entityId !== null) {
      const entityId = Number(opts.entityId);
      if (!Number.isInteger(entityId) || entityId <= 0) {
        throw new Error('Invalid entityId');
      }
      params.entityId = entityId;
      conditions.push('m.entity_id = @entityId');
    }

    if (opts?.seekMonths !== undefined) {
      if (typeof opts.seekMonths !== 'number' || !Number.isInteger(opts.seekMonths)) {
        throw new Error('Invalid seekMonths');
      }
      const d = new Date();
      d.setMonth(d.getMonth() - Math.abs(opts.seekMonths));
      params.dateTo = d.toISOString();
      conditions.push(`m.${isSqlite ? '"date"' : '[date]'} <= @dateTo`);
    }

    if (typeof opts?.search === 'string' && opts.search.trim() !== '') {
      params.searchPattern = `%${opts.search.trim()}%`;
      if (isSqlite) {
        conditions.push(`(
          m."number" LIKE @searchPattern
          OR m.external_number LIKE @searchPattern
          OR e.name LIKE @searchPattern
          OR e.first_name LIKE @searchPattern
          OR (IFNULL(e.first_name, '') || ' ' || IFNULL(e.name, '')) LIKE @searchPattern
          OR (IFNULL(e.name, '') || ' ' || IFNULL(e.first_name, '')) LIKE @searchPattern
        )`);
      } else {
        conditions.push(`(
          m.[number] LIKE @searchPattern
          OR m.external_number LIKE @searchPattern
          OR e.name LIKE @searchPattern
          OR e.first_name LIKE @searchPattern
          OR (ISNULL(e.first_name, '') + ' ' + ISNULL(e.name, '')) LIKE @searchPattern
          OR (ISNULL(e.name, '') + ' ' + ISNULL(e.first_name, '')) LIKE @searchPattern
        )`);
      }
    }

    if (opts?.onlyUnpaid === true) {
      conditions.push('COALESCE(rs.is_paid, 0) = 0');
    }

    if (opts?.onlyUndelivered === true) {
      conditions.push('COALESCE(rs.is_shipped, 0) = 0');
    }

    const whereClause = conditions.join('\n  AND ');
    const sqlCount = `
      SELECT COUNT(*) AS total
      FROM manifest m
      LEFT JOIN retouresummary rs ON rs.manifest_id = m.id
      LEFT JOIN entity e ON e.id = m.entity_id
      WHERE ${whereClause}
    `;

    let sqlList;
    if (isSqlite) {
      sqlList = `
        SELECT
            m.id,
            m."number",
            m."type",
            m.entity_id AS entityId,
            m.external_number AS externalNumber,
            m."date",
            m.created_at AS createdAt,
            rs.positions,
            rs.gross_total AS grossTotal,
            rs.paid_total AS paidTotal,
            rs.ordered_quantity AS orderedQuantity,
            rs.shipped_quantity AS shippedQuantity,
            rs.is_paid AS isPaid,
            rs.is_shipped AS isShipped,
            rs.customer_name AS customerName
        FROM manifest m
        LEFT JOIN retouresummary rs ON rs.manifest_id = m.id
        LEFT JOIN entity e ON e.id = m.entity_id
        WHERE ${whereClause}
        ORDER BY m."date" DESC, m.id DESC
        ${isPaged ? 'LIMIT @limit OFFSET @offset' : ''}
      `;
    } else {
      sqlList = `
        SELECT
            m.id,
            m.[number],
            m.[type],
            m.entity_id AS entityId,
            m.external_number AS externalNumber,
            m.[date],
            m.created_at AS createdAt,
            rs.positions,
            rs.gross_total AS grossTotal,
            rs.paid_total AS paidTotal,
            rs.ordered_quantity AS orderedQuantity,
            rs.shipped_quantity AS shippedQuantity,
            rs.is_paid AS isPaid,
            rs.is_shipped AS isShipped,
            rs.customer_name AS customerName
        FROM manifest m
        LEFT JOIN retouresummary rs ON rs.manifest_id = m.id
        LEFT JOIN entity e ON e.id = m.entity_id
        WHERE ${whereClause}
        ORDER BY m.[date] DESC, m.id DESC
        ${isPaged ? 'OFFSET @offset ROWS FETCH NEXT @limit ROWS ONLY' : ''}
      `;
    }

    const hasUserFilters = (
      opts?.seekMonths !== undefined ||
      (typeof opts?.search === 'string' && opts.search.trim() !== '') ||
      opts?.onlyUnpaid === true ||
      opts?.onlyUndelivered === true
    );

    let manifestRows;
    let total = 0;
    let unfilteredTotal = 0;

    if (isPaged) {
      params.offset = offset;
      params.limit = limit;
      const [countResult, listResult, unfilteredCountResult] = await Promise.all([
        runner.query(sqlCount, params),
        runner.query(sqlList, params),
        hasUserFilters ? runner.query(sqlCountManifests, { companyId, type: retoureType }) : null,
      ]);
      total = Number(countResult.rows[0]?.total ?? 0);
      unfilteredTotal = hasUserFilters
        ? Number(unfilteredCountResult?.rows[0]?.total ?? 0)
        : total;
      manifestRows = listResult.rows;
    } else {
      const result = await runner.query(sqlList, params);
      manifestRows = result.rows;
      total = manifestRows.length;
      if (hasUserFilters) {
        const countRes = await runner.query(sqlCountManifests, { companyId, type: retoureType });
        unfilteredTotal = Number(countRes.rows[0]?.total ?? 0);
      } else {
        unfilteredTotal = total;
      }
    }

    const manifestIds = manifestRows.map((r) => r.id);
    const linesByManifestId = new Map();

    if (manifestIds.length > 0) {
      const linesResult = await runner.query(sqlLinesByManifestIds, {
        manifestIdsJson: JSON.stringify(manifestIds),
      });
      for (const row of linesResult.rows) {
        let lines = linesByManifestId.get(row.manifestId);
        if (!lines) {
          lines = [];
          linesByManifestId.set(row.manifestId, lines);
        }
        lines.push(shapeLine(row));
      }
    }

    const retoures = manifestRows.map((row) => ({
      ...shapeSummary(retoureType, row),
      lines: linesByManifestId.get(row.id) ?? [],
      positions: row.positions !== undefined && row.positions !== null ? Number(row.positions) : undefined,
      grossTotal: row.grossTotal !== undefined && row.grossTotal !== null ? Number(row.grossTotal) : undefined,
      paidTotal: row.paidTotal !== undefined && row.paidTotal !== null ? Number(row.paidTotal) : undefined,
      orderedQuantity: row.orderedQuantity !== undefined && row.orderedQuantity !== null ? Number(row.orderedQuantity) : undefined,
      shippedQuantity: row.shippedQuantity !== undefined && row.shippedQuantity !== null ? Number(row.shippedQuantity) : undefined,
      isPaid: row.isPaid !== undefined && row.isPaid !== null ? Boolean(row.isPaid) : undefined,
      isShipped: row.isShipped !== undefined && row.isShipped !== null ? Boolean(row.isShipped) : undefined,
      customerName: row.customerName ?? undefined,
    }));

    if (isPaged) {
      return {
        retoures,
        total,
        unfilteredTotal,
        offset,
        limit,
      };
    }

    return retoures;
  };
}