import * as mssqlQueries from '../../providers/mssql/queries/delivery.js';
import * as sqliteQueries from '../../providers/sqlite3/queries/delivery.js';
import makeRunner from '../runner.js';
import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
import { shapeSummary } from './helpers.js';
import { shapeAttachmentMeta } from './attachments.js';

export default function list(provider) {
  const access = resolveSelectedCompanyAccess(provider);
  const isSqlite = provider?.dialect === 'sqlite3';
  const queries = isSqlite ? sqliteQueries : mssqlQueries;

  const sqlCountManifests = isSqlite
    ? 'SELECT COUNT(*) AS total FROM manifest WHERE company_id = @companyId AND "type" = @type'
    : 'SELECT COUNT(*) AS total FROM manifest WHERE company_id = @companyId AND [type] = @type';

  /**
   * Lists the deliveries 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 deliveries to skip.
   * @param {number} [opts.limit=50] - Number of deliveries to return.
   * @param {string} [opts.search] - Free-text search matching delivery number, external number, or supplier name.
   * @param {boolean} [opts.onlyUnbooked=false] - When true, returns only deliveries with unbooked stock items.
   * @param {number} [opts.supplierId] - Filter by supplier entity id.
   * @param {number} [opts.seekMonths] - Negative integer for cutoff months ago (e.g. -1).
   * @param {object} [tx] - Optional transaction.
   * @returns {Promise<{deliveries: 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.onlyUnbooked === true ||
      opts.supplierId !== 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: queries.DELIVERY_TYPE,
    };

    // Date cutoff via seekMonths (strictly integer)
    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`);
    }

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

    // Free-text search
    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
          OR ds.delivery_number LIKE @searchPattern
          OR ds.supplier_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
          OR ds.delivery_number LIKE @searchPattern
          OR ds.supplier_name LIKE @searchPattern
        )`);
      }
    }

    // Only unbooked deliveries (has stock positions that are not yet booked)
    if (opts?.onlyUnbooked === true) {
      conditions.push('(COALESCE(ds.unbooked_positions, 0) > 0 OR (COALESCE(ds.is_booked, 0) = 0 AND COALESCE(ds.stock_positions, 0) > 0))');
    }

    const whereClause = conditions.join('\n  AND ');
    const sqlCount = `
      SELECT COUNT(*) AS total
      FROM manifest m
      LEFT JOIN deliverysummary ds ON ds.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 supplierId,
            m.external_number AS externalNumber,
            m."date",
            m.created_at AS createdAt,
            ds.positions,
            ds.gross_total AS grossTotal,
            ds.net_total AS netTotal,
            ds.total_quantity AS totalQuantity,
            ds.stock_positions AS stockPositions,
            ds.booked_positions AS bookedPositions,
            ds.unbooked_positions AS unbookedPositions,
            ds.stock_quantity AS stockQuantity,
            ds.booked_quantity AS bookedQuantity,
            ds.unbooked_quantity AS unbookedQuantity,
            ds.is_booked AS isBooked,
            ds.supplier_name AS supplierName
        FROM manifest m
        LEFT JOIN deliverysummary ds ON ds.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 supplierId,
            m.external_number AS externalNumber,
            m.[date],
            m.created_at AS createdAt,
            ds.positions,
            ds.gross_total AS grossTotal,
            ds.net_total AS netTotal,
            ds.total_quantity AS totalQuantity,
            ds.stock_positions AS stockPositions,
            ds.booked_positions AS bookedPositions,
            ds.unbooked_positions AS unbookedPositions,
            ds.stock_quantity AS stockQuantity,
            ds.booked_quantity AS bookedQuantity,
            ds.unbooked_quantity AS unbookedQuantity,
            ds.is_booked AS isBooked,
            ds.supplier_name AS supplierName
        FROM manifest m
        LEFT JOIN deliverysummary ds ON ds.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?.onlyUnbooked === true ||
      opts?.supplierId !== undefined
    );

    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: queries.DELIVERY_TYPE }) : 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: queries.DELIVERY_TYPE });
        unfilteredTotal = Number(countRes.rows[0]?.total ?? 0);
      } else {
        unfilteredTotal = total;
      }
    }

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

    if (manifestIds.length > 0) {
      const sqlFiles = isSqlite
        ? `SELECT
            ma.id,
            ma.manifest_id AS manifestId,
            ma.file_id AS fileId,
            ma.sort,
            f.hash,
            f.mimetype,
            f.name,
            f.size,
            f.created,
            f.modified,
            f.thumbx,
            f.thumby,
            f.meta
          FROM manifestattachment ma
          INNER JOIN "file" f ON f.id = ma.file_id
          WHERE ma.manifest_id IN (SELECT value FROM json_each(@manifestIdsJson))
          ORDER BY ma.manifest_id, ma.sort ASC, ma.id ASC`
        : `SELECT
            ma.id,
            ma.manifest_id AS manifestId,
            ma.file_id AS fileId,
            ma.sort,
            f.hash,
            f.mimetype,
            f.name,
            f.size,
            f.created,
            f.modified,
            f.thumbavif,
            f.thumbx,
            f.thumby,
            f.meta
          FROM manifestattachment ma
          INNER JOIN [file] f ON f.id = ma.file_id
          WHERE ma.manifest_id IN (SELECT CAST(value AS INT) FROM OPENJSON(@manifestIdsJson))
          ORDER BY ma.manifest_id, ma.sort ASC, ma.id ASC`;

      const filesResult = await runner.query(sqlFiles, {
        manifestIdsJson: JSON.stringify(manifestIds),
      });

      for (const row of filesResult.rows) {
        const list = filesByManifest.get(row.manifestId) ?? [];
        list.push(shapeAttachmentMeta(row));
        filesByManifest.set(row.manifestId, list);
      }
    }

    const deliveries = manifestRows.map((row) => ({
      ...shapeSummary(row),
      positions: row.positions !== undefined && row.positions !== null ? Number(row.positions) : 0,
      grossTotal: row.grossTotal !== undefined && row.grossTotal !== null ? Number(row.grossTotal) : 0,
      netTotal: row.netTotal !== undefined && row.netTotal !== null ? Number(row.netTotal) : 0,
      totalQuantity: row.totalQuantity !== undefined && row.totalQuantity !== null ? Number(row.totalQuantity) : 0,
      stockPositions: row.stockPositions !== undefined && row.stockPositions !== null ? Number(row.stockPositions) : 0,
      bookedPositions: row.bookedPositions !== undefined && row.bookedPositions !== null ? Number(row.bookedPositions) : 0,
      unbookedPositions: row.unbookedPositions !== undefined && row.unbookedPositions !== null ? Number(row.unbookedPositions) : 0,
      stockQuantity: row.stockQuantity !== undefined && row.stockQuantity !== null ? Number(row.stockQuantity) : 0,
      bookedQuantity: row.bookedQuantity !== undefined && row.bookedQuantity !== null ? Number(row.bookedQuantity) : 0,
      unbookedQuantity: row.unbookedQuantity !== undefined && row.unbookedQuantity !== null ? Number(row.unbookedQuantity) : 0,
      isBooked: row.isBooked !== undefined && row.isBooked !== null ? Boolean(row.isBooked) : false,
      supplierName: row.supplierName ?? undefined,
      ledger: {
        totalPositions: Number(row.stockPositions ?? row.totalPositions ?? 0),
        completelyOnLedgerPositions: Number(row.bookedPositions ?? row.completelyOnLedgerPositions ?? 0),
        bookedPositions: Number(row.bookedPositions ?? 0),
        unbookedPositions: Number(row.unbookedPositions ?? 0),
        totalQuantity: Number(row.stockQuantity ?? 0),
        bookedQuantity: Number(row.bookedQuantity ?? 0),
        unbookedQuantity: Number(row.unbookedQuantity ?? 0),
        isBooked: Boolean(row.isBooked),
      },
      files: filesByManifest.get(row.id) ?? [],
    }));

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

    return deliveries;
  };
}