import { GraphQLError } from 'graphql';
import { BusinessTripsProvider } from '@modules/business-trips/providers/business-trips.provider.js';
import { TagsProvider } from '@modules/tags/providers/tags.provider.js';
import { tags_enum } from '@modules/tags/types.js';
import { EMPTY_UUID } from '@shared/constants';
import { ChargeSortByField } from '@shared/enums';
import type { Resolvers } from '@shared/gql-types';
import { getChargeType } from '../helpers/charge-type.js';
import { deleteCharge } from '../helpers/delete-charge.helper.js';
import { mergeChargesExecutor } from '../helpers/merge-charges.hepler.js';
import { ChargeRequiredWrapper, ChargesProvider } from '../providers/charges.provider.js';
import type { ChargesModule, IGetChargesByIdsResult, IUpdateChargeParams } from '../types.js';
import {
  commonChargeFields,
  commonDocumentsFields,
  commonFinancialAccountFields,
  commonFinancialEntityFields,
} from './common.js';

export const chargesResolvers: ChargesModule.Resolvers &
  Pick<Resolvers, 'UpdateChargeResult' | 'MergeChargeResult'> = {
  Query: {
    chargesByIDs: async (_, { chargeIDs }, { injector }) => {
      if (chargeIDs.length === 0) {
        return [];
      }

      const dbCharges = await injector.get(ChargesProvider).getChargeByIdLoader.loadMany(chargeIDs);
      if (!dbCharges) {
        if (chargeIDs.length === 1) {
          throw new GraphQLError(`Charge ID="${chargeIDs[0]}" not found`);
        } else {
          throw new GraphQLError(`Couldn't find any charges`);
        }
      }

      const charges = chargeIDs.map(id => {
        const charge = dbCharges.find(charge => charge && 'id' in charge && charge.id === id);
        if (!charge) {
          throw new GraphQLError(`Charge ID="${id}" not found`);
        }
        return charge as ChargeRequiredWrapper<IGetChargesByIdsResult>;
      });
      return charges;
    },
    allCharges: async (_, { filters, page, limit }, { injector }) => {
      // handle sort column
      let sortColumn: 'event_date' | 'event_amount' | 'abs_event_amount' = 'event_date';
      switch (filters?.sortBy?.field) {
        case ChargeSortByField.Amount:
          sortColumn = 'event_amount';
          break;
        case ChargeSortByField.AbsAmount:
          sortColumn = 'abs_event_amount';
          break;
        case ChargeSortByField.Date:
          sortColumn = 'event_date';
          break;
      }

      const charges = await injector
        .get(ChargesProvider)
        .getChargesByFilters({
          ownerIds: filters?.byOwners,
          fromDate: filters?.fromDate,
          toDate: filters?.toDate,
          fromAnyDate: filters?.fromAnyDate,
          toAnyDate: filters?.toAnyDate,
          sortColumn,
          asc: filters?.sortBy?.asc !== false,
          chargeType: filters?.chargesType,
          businessIds: filters?.byBusinesses,
          withoutInvoice: filters?.withoutInvoice,
          withoutDocuments: filters?.withoutDocuments,
          tags: filters?.byTags,
          accountantApproval: filters?.accountantApproval,
        })
        .catch(e => {
          throw new Error(e.message);
        });

      const pageCharges = charges.slice(page * limit - limit, page * limit);

      return {
        __typename: 'PaginatedCharges',
        nodes: pageCharges,
        pageInfo: {
          totalPages: Math.ceil(charges.length / limit),
        },
      };
    },
  },
  Mutation: {
    updateCharge: async (_, { chargeId, fields }, { injector }) => {
      const adjustedFields: IUpdateChargeParams = {
        accountantReviewed: fields.accountantApproval,
        isConversion: fields.isConversion,
        isProperty: fields.isProperty,
        ownerId: fields.ownerId,
        userDescription: fields.userDescription,
        taxCategoryId: fields.defaultTaxCategoryID,
        yearOfRelevance: fields.yearOfRelevance,
        chargeId,
      };
      try {
        injector.get(ChargesProvider).getChargeByIdLoader.clear(chargeId);
        const res = await injector.get(ChargesProvider).updateCharge({ ...adjustedFields });
        const updatedCharge = await injector
          .get(ChargesProvider)
          .getChargeByIdLoader.load(res[0].id);
        if (!updatedCharge) {
          throw new Error(`Charge ID="${chargeId}" not found`);
        }

        // handle tags
        if (fields?.tags?.length) {
          const newTags = fields.tags.map(t => t.name);
          const pastTagsItems = await injector
            .get(TagsProvider)
            .getTagsByChargeIDLoader.load(chargeId);
          const pastTags = pastTagsItems.map(({ tag_name }) => tag_name);
          // clear removed tags
          const tagsToRemove = pastTags.filter(tag => !newTags.includes(tag));
          if (tagsToRemove.length) {
            await injector.get(TagsProvider).clearChargeTags({ chargeId, tagNames: tagsToRemove });
          }
          // add new tags
          for (const tag of newTags as tags_enum[]) {
            if (!pastTags.includes(tag)) {
              await injector
                .get(TagsProvider)
                .insertChargeTags({ chargeId, tagName: tag })
                .catch(() => {
                  throw new GraphQLError(`Error adding tag "${tag}" to charge ID="${chargeId}"`);
                });
            }
          }
        }

        // handle business trip
        if (fields?.businessTripID) {
          await injector
            .get(BusinessTripsProvider)
            .updateChargeBusinessTrip(
              chargeId,
              fields.businessTripID === EMPTY_UUID ? null : fields.businessTripID,
            )
            .catch(() => {
              throw new GraphQLError(`Error updating business trip for charge ID="${chargeId}"`);
            });
        }

        return { charge: updatedCharge };
      } catch (e) {
        return {
          __typename: 'CommonError',
          message:
            (e as Error)?.message ??
            (e as { errors: Error[] })?.errors.map(e => e.message).toString() ??
            'Unknown error',
        };
      }
    },
    mergeCharges: async (_, { baseChargeID, chargeIdsToMerge, fields }, { injector }) => {
      try {
        const charge = await injector.get(ChargesProvider).getChargeByIdLoader.load(baseChargeID);
        if (!charge) {
          throw new Error(`Charge not found`);
        }

        if (fields) {
          const adjustedFields: IUpdateChargeParams = {
            accountantReviewed: fields?.accountantApproval,
            isConversion: fields?.isConversion,
            isProperty: fields?.isProperty,
            ownerId: fields?.ownerId,
            userDescription: fields?.userDescription,
            chargeId: baseChargeID,
          };
          injector.get(ChargesProvider).getChargeByIdLoader.clear(baseChargeID);
          await injector
            .get(ChargesProvider)
            .updateCharge({ ...adjustedFields })
            .catch(e => {
              throw new Error(
                `Failed to update charge:\n${
                  (e as Error)?.message ??
                  (e as { errors: Error[] })?.errors.map(e => e.message).toString()
                }`,
              );
            });
        }

        await mergeChargesExecutor(chargeIdsToMerge, baseChargeID, injector);

        return { charge };
      } catch (e) {
        return {
          __typename: 'CommonError',
          message:
            (e as Error)?.message ??
            (e as { errors: Error[] })?.errors.map(e => e.message).toString() ??
            'Unknown error',
        };
      }
    },
    deleteCharge: async (_, { chargeId }, { injector }) => {
      const charge = await injector.get(ChargesProvider).getChargeByIdLoader.load(chargeId);
      if (!charge) {
        throw new GraphQLError(`Charge ID="${chargeId}" not found`);
      }
      if (Number(charge.documents_count ?? 0) > 0 || Number(charge.transactions_count ?? 0) > 0) {
        throw new GraphQLError(`Charge ID="${chargeId}" has linked documents/transactions`);
      }

      await deleteCharge(chargeId, injector.get(ChargesProvider), injector.get(TagsProvider));
      return true;
    },
  },
  UpdateChargeResult: {
    __resolveType: (obj, _context, _info) => {
      if (('__typename' in obj && obj.__typename === 'CommonError') || 'message' in obj)
        return 'CommonError';
      return 'UpdateChargeSuccessfulResult';
    },
  },
  MergeChargeResult: {
    __resolveType: (obj, _context, _info) => {
      if (('__typename' in obj && obj.__typename === 'CommonError') || 'message' in obj)
        return 'CommonError';
      return 'MergeChargeSuccessfulResult';
    },
  },
  CommonCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'CommonCharge',
    ...commonChargeFields,
  },
  ConversionCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'ConversionCharge',
    ...commonChargeFields,
  },
  SalaryCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'SalaryCharge',
    ...commonChargeFields,
  },
  InternalTransferCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'InternalTransferCharge',
    ...commonChargeFields,
  },
  DividendCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'DividendCharge',
    ...commonChargeFields,
  },
  BusinessTripCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'BusinessTripCharge',
    ...commonChargeFields,
  },
  MonthlyVatCharge: {
    __isTypeOf: DbCharge => getChargeType(DbCharge) === 'MonthlyVatCharge',
    ...commonChargeFields,
  },
  Invoice: {
    ...commonDocumentsFields,
  },
  InvoiceReceipt: {
    ...commonDocumentsFields,
  },
  CreditInvoice: {
    ...commonDocumentsFields,
  },
  Proforma: {
    ...commonDocumentsFields,
  },
  Unprocessed: {
    ...commonDocumentsFields,
  },
  Receipt: {
    ...commonDocumentsFields,
  },
  BankFinancialAccount: {
    ...commonFinancialAccountFields,
  },
  CardFinancialAccount: {
    ...commonFinancialAccountFields,
  },
  LtdFinancialEntity: {
    ...commonFinancialEntityFields,
  },
  PersonalFinancialEntity: {
    ...commonFinancialEntityFields,
  },
};