const db = require('../db/models');
const ValidationError = require('./notifications/errors/validation');

const Sequelize = db.Sequelize;
const Op = Sequelize.Op;

/**
 * @param {string} permission
 * @param {object} currentUser
 */
async function checkPermissions(permission, currentUser) {
  if (!currentUser) {
    throw new ValidationError('auth.unauthorized');
  }

  const userPermission = currentUser.custom_permissions.find(
    (cp) => cp.name === permission,
  );

  if (userPermission) {
    return true;
  }

  try {
    if (!currentUser.app_role) {
      throw new ValidationError('auth.forbidden');
    }

    const permissions = await currentUser.app_role.getPermissions();

    return !!permissions.find((p) => p.name === permission);
  } catch (e) {
    throw e;
  }
}

module.exports = class SearchService {
  static async search(searchQuery, currentUser, organizationId, globalAccess) {
    try {
      if (!searchQuery) {
        throw new ValidationError('iam.errors.searchQueryRequired');
      }
      const tableColumns = {
        users: ['firstName', 'lastName', 'phoneNumber', 'email'],

        analytics_daily: ['top_referrers'],

        analytics_events: ['referrer', 'user_agent', 'ip_hash'],

        audit_logs: ['action', 'target_type', 'target_id', 'meta'],

        blocks: ['config'],

        button_links: ['label', 'url', 'icon'],

        domain_mappings: ['domain', 'verification_token'],

        email_logs: ['to_email', 'provider_id'],

        feature_flags: ['key'],

        flags: ['notes'],

        media_assets: ['url'],

        payment_transactions: ['currency', 'psp_txn_id'],

        plans: ['key', 'name', 'currency', 'features'],

        profile_pages: [
          'slug',

          'title',

          'bio',

          'og_title',

          'og_description',

          'og_image_url',
        ],

        social_links: ['handle', 'url'],

        subscriptions: ['psp_customer_id'],

        templates: ['key', 'name', 'colors'],

        organizations: ['name'],
      };
      const columnsInt = {
        analytics_daily: ['visits', 'clicks'],

        blocks: ['order_index'],

        button_links: ['order_index', 'click_count'],

        media_assets: ['width', 'height', 'size_bytes'],

        payment_transactions: ['amount_cents'],

        plans: ['price_cents'],

        social_links: ['order_index'],
      };

      let allFoundRecords = [];

      for (const tableName in tableColumns) {
        if (tableColumns.hasOwnProperty(tableName)) {
          const attributesToSearch = tableColumns[tableName];
          const attributesIntToSearch = columnsInt[tableName] || [];
          const whereCondition = {
            [Op.or]: [
              ...attributesToSearch.map((attribute) => ({
                [attribute]: {
                  [Op.iLike]: `%${searchQuery}%`,
                },
              })),
              ...attributesIntToSearch.map((attribute) =>
                Sequelize.where(
                  Sequelize.cast(
                    Sequelize.col(`${tableName}.${attribute}`),
                    'varchar',
                  ),
                  { [Op.iLike]: `%${searchQuery}%` },
                ),
              ),
            ],
          };

          if (
            !globalAccess &&
            tableName !== 'organizations' &&
            organizationId
          ) {
            whereCondition.organizationId = organizationId;
          }

          const hasPermission = await checkPermissions(
            `READ_${tableName.toUpperCase()}`,
            currentUser,
          );
          if (!hasPermission) {
            continue;
          }

          const foundRecords = await db[tableName].findAll({
            where: whereCondition,
            attributes: [
              ...tableColumns[tableName],
              'id',
              ...attributesIntToSearch,
            ],
          });

          const modifiedRecords = foundRecords.map((record) => {
            const matchAttribute = [];

            for (const attribute of attributesToSearch) {
              if (
                record[attribute]
                  ?.toLowerCase()
                  ?.includes(searchQuery.toLowerCase())
              ) {
                matchAttribute.push(attribute);
              }
            }

            for (const attribute of attributesIntToSearch) {
              const castedValue = String(record[attribute]);
              if (
                castedValue &&
                castedValue.toLowerCase().includes(searchQuery.toLowerCase())
              ) {
                matchAttribute.push(attribute);
              }
            }

            return {
              ...record.get(),
              matchAttribute,
              tableName,
            };
          });

          allFoundRecords = allFoundRecords.concat(modifiedRecords);
        }
      }

      return allFoundRecords;
    } catch (error) {
      throw error;
    }
  }
};
