import { getClientWithToken } from '../apollo/client';
import * as GQL from '../types';
import { formatDate, formatTime, getMinutes } from '../utils/datetime-format';
import { BaseService } from './base';
import { CustomersService } from './customers';
import { ServicesService } from './services';
import { type VariablesOf } from '@graphql-typed-document-node/core';
import dayjs from 'dayjs';

export class SlotsService extends BaseService {
  async createSlot(variables: VariablesOf<typeof GQL.CreateSlotDocument>) {
    const customerService = new CustomersService(this.customer);

    const { customer } = await customerService.getCustomer(this.customer);

    const { mutate } = await getClientWithToken();

    const mutationResult = await mutate({
      mutation: GQL.CreateSlotDocument,
      variables: {
        ...variables,
        input: {
          ...variables.input,
          date: formatDate(variables.input.date).db(),
          master: customer?.documentId,
          time_end: variables.input.time_end && formatTime(variables.input.time_end).db(),
          time_start: variables.input.time_start && formatTime(variables.input.time_start).db(),
        },
      },
    });

    const error = mutationResult.errors?.at(0);
    if (error) throw new Error(error.message);

    return mutationResult.data;
  }

  async deleteSlot(variables: VariablesOf<typeof GQL.DeleteSlotDocument>) {
    const { mutate } = await getClientWithToken();

    const mutationResult = await mutate({
      mutation: GQL.DeleteSlotDocument,
      variables,
    });

    const error = mutationResult.errors?.at(0);
    if (error) throw new Error(error.message);

    return mutationResult.data;
  }

  async getAvailableTimeSlots(
    variables: VariablesOf<typeof GQL.GetSlotsDocument>,
    context: { service: GQL.ServiceFiltersInput },
  ) {
    const { query } = await getClientWithToken();

    const getSlotsResult = await query({
      query: GQL.GetSlotsOrdersDocument,
      variables: {
        filters: {
          ...variables.filters,
          date: { eq: formatDate(variables?.filters?.date?.eq).db() },
          state: { eq: GQL.Enum_Slot_State.Open },
        },
      },
    });

    if (getSlotsResult.error) throw new Error(getSlotsResult.error.message);

    const servicesService = new ServicesService(this.customer);

    if (!context?.service?.documentId?.eq) throw new Error('Missing service id');

    const { service } = await servicesService.getService({
      documentId: context.service.documentId.eq,
    });

    if (!service) throw new Error('Service not found');

    const serviceDuration = getMinutes(service.duration);

    const openedSlots = getSlotsResult.data.slots;

    const times: Array<{ slotId: string; time: string }> = [];
    for (const slot of openedSlots) {
      if (!slot?.time_start || !slot?.time_end) continue;

      let startTime = dayjs(`${slot.date} ${slot.time_start}`);
      const endTime = dayjs(`${slot.date} ${slot.time_end}`).subtract(serviceDuration, 'minutes');

      while (startTime.valueOf() <= endTime.valueOf()) {
        const slotStartTime = startTime;
        const potentialEndTime = startTime.add(serviceDuration, 'minutes');

        const hasConflict = slot.orders.some(
          (order) =>
            order &&
            slotStartTime.isBefore(dayjs(`${slot.date} ${order.time_end}`)) &&
            potentialEndTime.isAfter(dayjs(`${slot.date} ${order.time_start}`)),
        );

        if (!hasConflict) {
          times.push({ slotId: slot.documentId, time: startTime.format('HH:mm') });
        }

        startTime = startTime.add(15, 'minutes');
      }
    }

    return { times };
  }

  async getSlot(variables: VariablesOf<typeof GQL.GetSlotDocument>) {
    const { query } = await getClientWithToken();

    const result = await query({
      query: GQL.GetSlotDocument,
      variables,
    });

    if (result.error) throw new Error(result.error.message);

    return result.data;
  }

  async getSlots(variables: VariablesOf<typeof GQL.GetSlotsDocument>) {
    const { query } = await getClientWithToken();

    const result = await query({
      query: GQL.GetSlotsDocument,
      variables: {
        filters: {
          ...variables.filters,
          date: { eq: formatDate(variables?.filters?.date?.eq).db() },
        },
      },
    });

    if (result.error) throw new Error(result.error.message);

    return result.data;
  }

  async updateSlot(variables: VariablesOf<typeof GQL.UpdateSlotDocument>) {
    const { mutate } = await getClientWithToken();

    const mutationResult = await mutate({
      mutation: GQL.UpdateSlotDocument,
      variables: {
        ...variables,
        data: {
          ...variables.data,
          date: variables.data?.date ? formatDate(variables.data.date).db() : undefined,
          time_end: variables.data?.time_end ? formatTime(variables.data.time_end).db() : undefined,
          time_start: variables.data?.time_start
            ? formatTime(variables.data.time_start).db()
            : undefined,
        },
      },
    });

    const error = mutationResult.errors?.at(0);
    if (error) throw new Error(error.message);

    return mutationResult.data;
  }
}