import { Router, Request, Response, NextFunction } from 'express';
import { check, param, query } from 'express-validator';
import { Service, Inject } from 'typedi';
import asyncMiddleware from 'api/middleware/asyncMiddleware';
import BaseController from 'api/controllers/BaseController';
import AccountsService from 'services/Accounts/AccountsService';
import { IAccountDTO, IAccountsFilter } from 'interfaces';
import { ServiceError } from 'exceptions';
import DynamicListingService from 'services/DynamicListing/DynamicListService';

@Service()
export default class AccountsController extends BaseController{
  @Inject()
  accountsService: AccountsService;

  @Inject()
  dynamicListService: DynamicListingService;
 
  /**
   * Router constructor method.
   */
  router() {
    const router = Router();

    router.post(
      '/bulk/:type(activate|inactivate)', [
        ...this.bulkSelectIdsQuerySchema
      ],
      this.validationResult,
      asyncMiddleware(this.bulkToggleActivateAccounts.bind(this))
    );
    router.post(
      '/:id/activate', [
        ...this.accountParamSchema,
      ],
      asyncMiddleware(this.activateAccount.bind(this)),
      this.catchServiceErrors,
    );
    router.post(
      '/:id/inactivate', [
        ...this.accountParamSchema,
      ],
      asyncMiddleware(this.inactivateAccount.bind(this)),
      this.catchServiceErrors,
    );
    router.post(
      '/:id/close', [
        ...this.accountParamSchema,
        ...this.closingAccountSchema,
      ],
      this.validationResult,
      asyncMiddleware(this.closeAccount.bind(this)),
      this.catchServiceErrors,
    )
    router.post(
      '/:id', [
        ...this.accountDTOSchema,
        ...this.accountParamSchema,
      ],
      this.validationResult,
      asyncMiddleware(this.editAccount.bind(this)),
      this.catchServiceErrors,
    );
    router.post(
      '/', [
        ...this.accountDTOSchema,
      ],
      this.validationResult,
      asyncMiddleware(this.newAccount.bind(this)),
      this.catchServiceErrors,
    );
    router.get(
      '/:id', [
        ...this.accountParamSchema,
      ],
      this.validationResult,
      asyncMiddleware(this.getAccount.bind(this)),
      this.catchServiceErrors,
    );
    router.get(
      '/', [
        ...this.accountsListSchema,
      ],
      this.validationResult,
      asyncMiddleware(this.getAccountsList.bind(this)),
      this.dynamicListService.handlerErrorsToResponse,
      this.catchServiceErrors,
    );
    router.delete(
      '/', [
        ...this.bulkSelectIdsQuerySchema,
      ],
      this.validationResult,
      asyncMiddleware(this.deleteBulkAccounts.bind(this)),
      this.catchServiceErrors,
    );
    router.delete(
      '/:id', [
        ...this.accountParamSchema
      ],
      this.validationResult,
      asyncMiddleware(this.deleteAccount.bind(this)),
      this.catchServiceErrors,
    );
    return router;
  }

  /**
   * Account DTO Schema validation.
   */
  get accountDTOSchema() {
    return [
      check('name')
        .exists()
        .isLength({ min: 3, max: 255 })
        .trim()
        .escape(),
      check('code')
        .optional({ nullable: true })
        .isLength({ min: 3, max: 6 })
        .trim()
        .escape(),
      check('account_type_id')
        .exists()
        .isNumeric()
        .toInt(),
      check('description')
        .optional({ nullable: true })
        .isLength({ max: 512 })
        .trim()
        .escape(),
      check('parent_account_id')
        .optional({ nullable: true })
        .isNumeric()
        .toInt(),
    ];
  }

  get accountParamSchema() {
    return [
      param('id').exists().isNumeric().toInt()
    ];
  }

  get accountsListSchema() {
    return [
      query('custom_view_id').optional().isNumeric().toInt(),
      query('stringified_filter_roles').optional().isJSON(),

      query('column_sort_by').optional(),
      query('sort_order').optional().isIn(['desc', 'asc']),
    ];
  }

  get bulkSelectIdsQuerySchema() {
    return [
      query('ids').isArray({ min: 2 }),
      query('ids.*').isNumeric().toInt(),
    ];
  }

  get closingAccountSchema() {
    return [
      check('to_account_id').exists().isNumeric().toInt(),
      check('delete_after_closing').exists().isBoolean(),
    ]
  }

  /**
   * Creates a new account.
   * @param {Request} req - 
   * @param {Response} res -
   * @param {NextFunction} next - 
   */
  async newAccount(req: Request, res: Response, next: NextFunction) {
    const { tenantId } = req;
    const accountDTO: IAccountDTO = this.matchedBodyData(req);

    try {
      const account = await this.accountsService.newAccount(tenantId, accountDTO);

      return res.status(200).send({ id: account.id });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Edit account details.
   * @param {Request} req 
   * @param {Response} res
   * @return {Response}
   */
  async editAccount(req: Request, res: Response, next: NextFunction) {
    const { tenantId } = req;
    const { id: accountId } = req.params;
    const accountDTO: IAccountDTO = this.matchedBodyData(req);

    try {
      const account = await this.accountsService.editAccount(tenantId, accountId, accountDTO);
      return res.status(200).send({ id: account.id });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Get details of the given account.
   * @param {Request} req 
   * @param {Response} res
   * @return {Response}
   */
  async getAccount(req: Request, res: Response, next: NextFunction) {
    const { tenantId } = req;
    const { id: accountId } = req.params;
    
    try {
      const account = await this.accountsService.getAccount(tenantId, accountId);
      return res.status(200).send({ account });

    } catch (error) {
      next(error);
    }
  }

  /**
   * Delete the given account.
   * @param {Request} req 
   * @param {Response} res
   * @return {Response}
   */
  async deleteAccount(req: Request, res: Response, next: NextFunction) {
    const { id: accountId } = req.params;
    const { tenantId } = req;

    try {
      await this.accountsService.deleteAccount(tenantId, accountId);
      return res.status(200).send({ id: accountId });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Activate the given account.
   * @param {Response} res - 
   * @param {Request} req - 
   * @return {Response}
   */
  async activateAccount(req: Request, res: Response, next: Function){
    const { id: accountId } = req.params;
    const { tenantId } = req;

    try {
      await this.accountsService.activateAccount(tenantId, accountId, true);
      return res.status(200).send({ id: accountId });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Inactive the given account.
   * @param {Response} res - 
   * @param {Request} req - 
   * @return {Response}
   */
  async inactivateAccount(req: Request, res: Response, next: Function){
    const { id: accountId } = req.params;
    const { tenantId } = req;

    try {
      await this.accountsService.activateAccount(tenantId, accountId, false);
      return res.status(200).send({ id: accountId });

    } catch (error) {
      next(error);
    }
  }

  /**
   * Bulk activate/inactivate accounts.
   * @param {Request} req 
   * @param {Response} res 
   * @param {NextFunction} next 
   */
  async bulkToggleActivateAccounts(req: Request, res: Response, next: Function) {
    const { type } = req.params;
    const { tenantId  } = req;
    const { ids: accountsIds } = req.query;
    
    try {
      const isActive = (type === 'activate' ? true : false);
      await this.accountsService.activateAccounts(tenantId, accountsIds, isActive);

      return res.status(200).send({ ids: accountsIds });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Deletes accounts in bulk.
   * @param {Request} req 
   * @param {Response} res 
   * @param {NextFunction} next 
   */
  async deleteBulkAccounts(req: Request, res: Response, next: NextFunction) {
    const { ids: accountsIds } = req.query;
    const { tenantId } = req;

    try {
      await this.accountsService.deleteAccounts(tenantId, accountsIds);
      return res.status(200).send({ ids: accountsIds });

    } catch (error) {
      next(error);
    }
  }

  /**
   * Retrieve accounts datatable list.
   * @param {Request} req 
   * @param {Response} res 
   */
  async getAccountsList(req: Request, res: Response, next: NextFunction) {
    const { tenantId } = req;
    const filter: IAccountsFilter = {
      filterRoles: [],
      sortOrder: 'asc',
      columnSortBy: 'name',
      ...this.matchedQueryData(req),
    };
    if (filter.stringifiedFilterRoles) {
      filter.filterRoles = JSON.parse(filter.stringifiedFilterRoles);
    }
    try {
      const { accounts, filterMeta } = await this.accountsService.getAccountsList(tenantId, filter);

      return res.status(200).send({
        accounts,
        filter_meta: this.transfromToResponse(filterMeta)
      });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Closes the given account.
   * @param {Request} req 
   * @param {Response} res 
   * @param next 
   */
  async closeAccount(req: Request, res: Response, next: NextFunction) {
    const { tenantId } = req;
    const { id: accountId } = req.params;
    const closeAccountQuery = this.matchedBodyData(req);

    try {
      await this.accountsService.closeAccount(
        tenantId,
        accountId,
        closeAccountQuery.toAccountId,
        closeAccountQuery.deleteAfterClosing
      );
      return res.status(200).send({ id: accountId });
    } catch (error) {
      next(error);
    }
  }

  /**
   * Transforms service errors to response.
   * @param {Error} 
   * @param {Request} req 
   * @param {Response} res 
   * @param {ServiceError} error 
   */ 
  catchServiceErrors(error, req: Request, res: Response, next: NextFunction) {
    if (error instanceof ServiceError) {
      if (error.errorType === 'account_not_found') {
        return res.boom.notFound(
          'The given account not found.',
          { errors: [{ type: 'ACCOUNT.NOT.FOUND', code: 100 }] }
        );
      }
      if (error.errorType === 'account_name_not_unqiue') {
        return res.boom.badRequest(
          'The given account not unique.',
          { errors: [{ type: 'ACCOUNT.NAME.NOT.UNIQUE', code: 150 }], }
        );
      }
      if (error.errorType === 'account_type_not_found') {
        return res.boom.badRequest(
          'The given account type not found.',
          { errors: [{ type: 'ACCOUNT_TYPE_NOT_FOUND', code: 200 }] }
        );
      }
      if (error.errorType === 'account_type_not_allowed_to_changed') {
        return res.boom.badRequest(
          'Not allowed to change account type of the account.',
          { errors: [{ type: 'NOT.ALLOWED.TO.CHANGE.ACCOUNT.TYPE', code: 300 }] }
        );
      }
      if (error.errorType === 'parent_account_not_found') {
        return res.boom.badRequest(
          'The parent account not found.',
          { errors: [{ type: 'PARENT_ACCOUNT_NOT_FOUND', code: 400 }] },
        );
      }
      if (error.errorType === 'parent_has_different_type') {
        return res.boom.badRequest(
          'The parent account has different type.',
          { errors: [{ type: 'PARENT.ACCOUNT.HAS.DIFFERENT.ACCOUNT.TYPE', code: 500 }] }
        );
      }
      if (error.errorType === 'account_code_not_unique') {
        return res.boom.badRequest(
          'The given account code is not unique.',
          { errors: [{ type: 'NOT_UNIQUE_CODE', code: 600 }] }
        );
      }
      if (error.errorType === 'account_has_children') {
        return res.boom.badRequest(
          'You could not delete account has children.',
          { errors: [{ type: 'ACCOUNT.HAS.CHILD.ACCOUNTS', code: 700 }] }
        );
      }
      if (error.errorType === 'account_has_associated_transactions') {
        return res.boom.badRequest(
          'You could not delete account has associated transactions.',
          { errors: [{ type: 'ACCOUNT.HAS.ASSOCIATED.TRANSACTIONS', code: 800 }] }
        );
      }
      if (error.errorType === 'account_predefined') {
        return res.boom.badRequest(
          'You could not delete predefined account',
          { errors: [{ type: 'ACCOUNT.PREDEFINED', code: 900 }] }
        );
      }
      if (error.errorType === 'accounts_not_found') {
        return res.boom.notFound(
          'Some of the given accounts not found.',
          { errors: [{ type: 'SOME.ACCOUNTS.NOT_FOUND', code: 1000 }] },
        );
      }
      if (error.errorType === 'predefined_accounts') {
        return res.boom.badRequest(
          'Some of the given accounts are predefined.',
          { errors: [{ type: 'ACCOUNTS_PREDEFINED', code: 1100 }] }
        );
      }
      if (error.errorType === 'close_account_and_to_account_not_same_type') {
        return res.boom.badRequest(
          'The close account has different root type with to account.',
          { errors: [{ type: 'CLOSE_ACCOUNT_AND_TO_ACCOUNT_NOT_SAME_TYPE', code: 1200 }] },
        );
      }
    }
    next(error)
  }
};