import { GraphQLError } from 'graphql';
import type { Resolvers } from '../../../__generated__/types.js';
import { EMPTY_UUID } from '../../../shared/constants.js';
import { formatCurrency } from '../../../shared/helpers/index.js';
import { AdminContextProvider } from '../../admin-context/providers/admin-context.provider.js';
import { ScopeProvider } from '../../auth/providers/scope.provider.js';
import { deleteCharges } from '../../charges/helpers/delete-charges.helper.js';
import { ChargesProvider } from '../../charges/providers/charges.provider.js';
import { DocumentsProvider } from '../../documents/providers/documents.provider.js';
import { ExchangeProvider } from '../../exchange-rates/providers/exchange.provider.js';
import { effectiveDateSupplement } from '../helpers/effective-date.helper.js';
import { TransactionsProvider } from '../providers/transactions.provider.js';
import type {
  IGetTransactionsByIdsResult,
  IUpdateTransactionsParams,
  TransactionsModule,
} from '../types.js';
import { commonChargeFields, commonTransactionFields } from './common.js';

export const transactionsResolvers: TransactionsModule.Resolvers &
  Pick<Resolvers, 'UpdateTransactionResult' | 'UpdateTransactionsResult'> = {
  Query: {
    transactionsByIDs: async (_, { transactionIDs }, { injector }) => {
      if (transactionIDs.length === 0) {
        return [];
      }

      const transactions = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.loadMany(transactionIDs);
      if (!transactions) {
        if (transactionIDs.length === 1) {
          throw new GraphQLError(`Transaction ID="${transactionIDs[0]}" not found`);
        } else {
          throw new GraphQLError(`Couldn't find any transactions`);
        }
      }

      transactionIDs.map(id => {
        const transaction = transactions.find(
          transaction => !(transaction instanceof Error) && transaction.id === id,
        );
        if (!transaction) {
          throw new GraphQLError(`Transaction ID="${id}" not found`);
        }
      });
      return transactionIDs;
    },
    transactionsByFinancialEntity: async (_, { financialEntityID }, { injector }) => {
      const ownerIDs = await injector.get(ScopeProvider).getReadScope();
      const transactions = await injector
        .get(TransactionsProvider)
        .getTransactionsByFilters({
          businessIDs: [financialEntityID],
          ownerIDs,
        })
        .then(res => res.map(t => t.id));
      return transactions;
    },
  },
  Mutation: {
    updateTransaction: async (_, { transactionId, fields }, { injector }) => {
      let postUpdateActions = async (): Promise<void> => void 0;

      try {
        // let charge: ChargesTypes.IGetChargesByIdsResult | undefined;

        const existingChargePromise = async () => {
          const charge = await injector
            .get(ChargesProvider)
            .getChargeByIdLoader.load(fields.chargeId ?? '');
          if (!charge) {
            throw new GraphQLError(`Charge ID="${chargeId}" not valid`);
          }
        };
        const emptyChargePromise = async () => {
          // case unlinked from charge
          const transaction = await injector
            .get(TransactionsProvider)
            .transactionByIdLoader.load(transactionId);
          if (!transaction) {
            throw new GraphQLError(`Transaction ID="${transactionId}" not valid`);
          }
          if (transaction.charge_id) {
            const [charge, transactions, documents] = await Promise.all([
              injector.get(ChargesProvider).getChargeByIdLoader.load(transaction.charge_id),
              injector
                .get(TransactionsProvider)
                .transactionsByChargeIDLoader.load(transaction.charge_id),
              injector
                .get(DocumentsProvider)
                .getDocumentsByChargeIdLoader.load(transaction.charge_id),
            ]);
            if (!charge) {
              throw new GraphQLError(`Former transaction's charge ID ("${chargeId}") not valid`);
            }

            // generate new charge
            const newCharge = await injector.get(ChargesProvider).generateCharge({
              ownerId: charge.owner_id,
              userDescription: 'Transaction unlinked from charge',
            });
            if (!newCharge) {
              throw new GraphQLError(
                `Failed to generate new charge for transaction ID="${transactionId}"`,
              );
            }
            chargeId = newCharge.id;

            if (documents.length === 0 && transactions.length === 1) {
              postUpdateActions = async () =>
                deleteCharges([charge.id], injector)
                  .catch(e => {
                    if (e instanceof GraphQLError) {
                      throw e;
                    }
                    console.error(e);
                    throw new GraphQLError(
                      `Failed to delete the empty former charge ID="${charge.id}"`,
                    );
                  })
                  .then(postUpdateActions);
            }
          }
        };

        let chargeId = fields.chargeId;
        const chargePromise =
          chargeId && chargeId !== EMPTY_UUID
            ? existingChargePromise()
            : chargeId === EMPTY_UUID
              ? emptyChargePromise()
              : Promise.resolve();

        await chargePromise;

        const adjustedFields: IUpdateTransactionsParams = {
          transactionIds: [transactionId],
          businessId: fields.counterpartyId,
          chargeId: chargeId ?? null,
          debitDate: fields.effectiveDate ?? null,
          isFee: fields.isFee,
        };

        const res = await injector
          .get(TransactionsProvider)
          .updateTransactions({ ...adjustedFields });
        if (!res[0]?.id) {
          throw new GraphQLError('Transaction update failed');
        }

        await postUpdateActions();

        return res[0].id;
      } catch (e) {
        if (e instanceof GraphQLError) {
          throw e;
        }
        console.error(e);
        return {
          __typename: 'CommonError',
          message: (e as Error)?.message ?? 'Unknown error',
        };
      }
    },
    updateTransactions: async (_, { transactionIds, fields }, { injector }) => {
      let postUpdateActions = async (): Promise<void> => void 0;

      try {
        const { ownerId } = await injector.get(AdminContextProvider).getVerifiedAdminContext();
        const existingChargePromise = async () => {
          // verify charge exists
          const charge = await injector
            .get(ChargesProvider)
            .getChargeByIdLoader.load(fields.chargeId ?? '');
          if (!charge) {
            throw new GraphQLError(`Charge ID="${chargeId}" not valid`);
          }
        };
        const emptyChargePromise = async () => {
          // case unlinked from charge
          const transactions = await injector
            .get(TransactionsProvider)
            .transactionByIdLoader.loadMany(transactionIds)
            .then(
              res =>
                res.filter((t, i) => {
                  if (t instanceof Error) {
                    throw new GraphQLError(`Transaction ID="${transactionIds[i]}" not valid`);
                  }
                  return true;
                }) as IGetTransactionsByIdsResult[],
            );

          const transactionsWithChargeId = transactions.filter(t => t.charge_id);
          if (transactionsWithChargeId.length > 0) {
            const chargesToDelete = new Set<string>();
            await Promise.all(
              transactionsWithChargeId.map(async transaction => {
                if (!transaction.charge_id) {
                  return;
                }
                const [charge, transactions, documents] = await Promise.all([
                  injector.get(ChargesProvider).getChargeByIdLoader.load(transaction.charge_id),
                  injector
                    .get(TransactionsProvider)
                    .transactionsByChargeIDLoader.load(transaction.charge_id),
                  injector
                    .get(DocumentsProvider)
                    .getDocumentsByChargeIdLoader.load(transaction.charge_id),
                ]);
                if (!charge) {
                  throw new GraphQLError(
                    `Former transaction's charge ID ("${transaction.charge_id}") not valid`,
                  );
                }

                if (documents.length === 0 && transactions.length === 1) {
                  chargesToDelete.add(charge.id);
                }
              }),
            );

            if (chargesToDelete.size > 0) {
              const oldPostUpdateActions = postUpdateActions;
              postUpdateActions = async () => {
                await oldPostUpdateActions();
                await deleteCharges(Array.from(chargesToDelete), injector).catch(e => {
                  if (e instanceof GraphQLError) {
                    throw e;
                  }
                  console.error(e);
                  throw new GraphQLError(
                    `Failed to delete empty former charges: ${Array.from(chargesToDelete).join(', ')}`,
                  );
                });
              };
            }

            // generate new charge
            const newCharge = await injector.get(ChargesProvider).generateCharge({
              ownerId,
              userDescription: 'Transactions unlinked from charge',
            });
            if (!newCharge) {
              throw new GraphQLError(`Failed to generate new charge for transactions update`);
            }
            chargeId = newCharge.id;
          }
        };

        let chargeId = fields.chargeId;
        const chargePromise =
          chargeId && chargeId !== EMPTY_UUID
            ? existingChargePromise()
            : chargeId === EMPTY_UUID
              ? emptyChargePromise()
              : Promise.resolve();

        await chargePromise;

        const adjustedFields: IUpdateTransactionsParams = {
          transactionIds,
          businessId: fields.counterpartyId,
          chargeId: chargeId ?? null,
          debitDate: fields.effectiveDate ?? null,
          isFee: fields.isFee,
        };

        const res = await injector.get(TransactionsProvider).updateTransactions(adjustedFields);
        if (!res[0]?.id) {
          throw new GraphQLError('Transactions update failed');
        }

        await postUpdateActions();

        return { transactions: res.map(transaction => transaction.id) };
      } catch (e) {
        if (e instanceof GraphQLError) {
          throw e;
        }
        console.error(e);
        return {
          __typename: 'CommonError',
          message: (e as Error)?.message ?? 'Unknown error',
        };
      }
    },
  },
  UpdateTransactionResult: {
    __resolveType: async (raw, { injector }, _info) => {
      if (typeof raw === 'string') {
        const transaction = await injector
          .get(TransactionsProvider)
          .transactionByIdLoader.load(raw);

        const charge = await injector
          .get(ChargesProvider)
          .getChargeByIdLoader.load(transaction.charge_id);
        if (!charge) {
          throw new GraphQLError(`Charge with ID "${transaction.charge_id}" not found`);
        }
        return charge.type === 'CONVERSION' ? 'ConversionTransaction' : 'CommonTransaction';
      }
      if (typeof raw === 'object' && '__typename' in raw && raw.__typename === 'CommonError') {
        return 'CommonError';
      }
      throw new GraphQLError('Unexpected type for UpdateTransactionResult');
    },
  },
  UpdateTransactionsResult: {
    __resolveType: (obj, _context, _info) => {
      if (('__typename' in obj && obj.__typename === 'CommonError') || 'message' in obj)
        return 'CommonError';
      return 'UpdatedTransactionsSuccessfulResult';
    },
  },
  BankDepositCharge: commonChargeFields,
  BusinessTripCharge: commonChargeFields,
  CommonCharge: commonChargeFields,
  ConversionCharge: commonChargeFields,
  CreditcardBankCharge: commonChargeFields,
  DividendCharge: commonChargeFields,
  FinancialCharge: commonChargeFields,
  ForeignSecuritiesCharge: commonChargeFields,
  InternalTransferCharge: commonChargeFields,
  MonthlyVatCharge: commonChargeFields,
  SalaryCharge: commonChargeFields,
  ConversionTransaction: {
    __isTypeOf: async (transactionId, { injector }) => {
      const transaction = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.load(transactionId);

      const charge = await injector
        .get(ChargesProvider)
        .getChargeByIdLoader.load(transaction.charge_id);
      if (!charge) {
        throw new GraphQLError(`Charge ID="${transaction.charge_id}" not found`);
      }
      return charge.type === 'CONVERSION';
    },
    ...commonTransactionFields,
    effectiveDate: async (transactionId, __dirname, { injector }) => {
      const transaction = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.load(transactionId);

      const date = effectiveDateSupplement(transaction);
      if (!date) {
        console.error(`Conversion transaction ID="${transactionId}" has no effective date`);
        throw new GraphQLError('Conversion transaction must have effective date');
      }
      return date;
    },
    type: async (transactionId, __dirname, { injector }) => {
      const transaction = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.load(transactionId);
      return Number(transaction.amount) > 0 ? 'QUOTE' : 'BASE';
    },
    bankRate: async (transactionId, __dirname, { injector }) => {
      const transaction = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.load(transactionId);

      return transaction.currency_rate;
    },
    officialRateToLocal: async (transactionId, _, { injector }) => {
      const { defaultLocalCurrency } = await injector
        .get(AdminContextProvider)
        .getVerifiedAdminContext();

      const transaction = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.load(transactionId);

      return injector
        .get(ExchangeProvider)
        .getExchangeRates(
          defaultLocalCurrency,
          formatCurrency(transaction.currency),
          transaction.event_date,
        );
    },
  },
  CommonTransaction: {
    __isTypeOf: async (transactionId, { injector }) => {
      const transaction = await injector
        .get(TransactionsProvider)
        .transactionByIdLoader.load(transactionId);

      const charge = await injector
        .get(ChargesProvider)
        .getChargeByIdLoader.load(transaction.charge_id);
      if (!charge) {
        throw new GraphQLError(`Charge ID="${transaction.charge_id}" not found`);
      }
      if (charge instanceof GraphQLError) {
        console.error(charge);
        throw new GraphQLError(`Charge ID="${transaction.charge_id}" not found`);
      }
      return charge.type !== 'CONVERSION';
    },
    ...commonTransactionFields,
  },
};