import type {
  BulkCreateDiscountCodesResponseDto,
  CreateDiscountCodesDto,
  DiscountCodeResponseDto,
  DiscountPreviewResponseDto,
  DiscountRedemptionResponseDto,
  DiscountReportSummaryDto,
} from '@/api/generated/models'
import { getDiscountCodes } from '@/api/generated/discount-codes/discount-codes'
import { getFinancial } from '@/api/generated/financial/financial'
import axiosInstance from '@/config/axios'
import { parseRemittanceList, unwrapApiPayload } from '@/helpers/listResponse'
import { texts } from '@/texts'
import {
  createServiceError,
  errorResult,
  handleServiceError,
  type ServiceCallOptions,
  type ServiceResult,
  shouldBubbleErrorToParent,
  successResult,
} from '@/services/errorHandler'

export type DiscountCode = DiscountCodeResponseDto
export type DiscountRedemption = DiscountRedemptionResponseDto
export type DiscountReport = DiscountReportSummaryDto
export type DiscountBulkResult = BulkCreateDiscountCodesResponseDto
export type DiscountPreview = DiscountPreviewResponseDto
export type DiscountType = CreateDiscountCodesDto['type']
export type DiscountBearer = NonNullable<CreateDiscountCodesDto['bearer']>

export interface DiscountCodesPage {
  items: DiscountCode[]
  totalItemsCount: number
  totalPages: number
}

export interface DiscountRedemptionsPage {
  items: DiscountRedemption[]
  totalItemsCount: number
  totalPages: number
}

export interface DiscountManagementBootstrap {
  codes: { items: DiscountCode[] }
  report: DiscountReport
  redemptions: { items: DiscountRedemption[] }
}

export interface BulkCreateDiscountInput {
  type: DiscountType
  value: number
  quantity: number
  maxUses?: number
  maxUsesPerUser?: number
  validFrom?: string
  validUntil?: string
  bearer?: DiscountBearer
}

const discountApi = getDiscountCodes()
const financialApi = getFinancial()

const wrap = async <T>(run: () => Promise<T>, options?: ServiceCallOptions): Promise<ServiceResult<T>> => {
  try {
    return successResult(await run())
  } catch (error) {
    const normalizedError = handleServiceError(error, options)

    if (shouldBubbleErrorToParent(options)) {
      throw normalizedError
    }

    return errorResult(normalizedError)
  }
}

export const GET_DISCOUNT_MANAGEMENT_BOOTSTRAP = (
  eventId: string,
  options?: ServiceCallOptions
): Promise<ServiceResult<DiscountManagementBootstrap>> =>
  wrap(async () => {
    const response = await axiosInstance.get(`events/${eventId}/discount-codes/management-bootstrap`)

    return unwrapApiPayload<DiscountManagementBootstrap>(response.data)
  }, options)

export const LIST_DISCOUNT_CODES = (
  eventId: string,
  params: { page?: number; pageSize?: number } = {},
  options?: ServiceCallOptions
): Promise<ServiceResult<DiscountCodesPage>> =>
  wrap(async () => {
    const res = await discountApi.discountCodesControllerList(eventId, {
      page: params.page ?? 1,
      pageSize: params.pageSize ?? 50,
      sort: '-createdAt',
    })
    const parsed = parseRemittanceList<DiscountCode>(res.data)

    return {
      items: parsed.items,
      totalItemsCount: parsed.pagination.totalItemsCount,
      totalPages: parsed.pagination.totalPages ?? 0,
    }
  }, options)

export const LIST_DISCOUNT_REDEMPTIONS = (
  eventId: string,
  params: { page?: number; pageSize?: number } = {},
  options?: ServiceCallOptions
): Promise<ServiceResult<DiscountRedemptionsPage>> =>
  wrap(async () => {
    const res = await discountApi.discountCodesControllerRedemptions(eventId, {
      page: params.page ?? 1,
      pageSize: params.pageSize ?? 50,
      sort: '-createdAt',
    })
    const parsed = parseRemittanceList<DiscountRedemption>(res.data)

    return {
      items: parsed.items,
      totalItemsCount: parsed.pagination.totalItemsCount,
      totalPages: parsed.pagination.totalPages ?? 0,
    }
  }, options)

export const GET_DISCOUNT_REPORT = (eventId: string, options?: ServiceCallOptions): Promise<ServiceResult<DiscountReport>> =>
  wrap(async () => {
    const res = await discountApi.discountCodesControllerReport(eventId)

    return unwrapApiPayload<DiscountReport>(res.data)
  }, options)

export const BULK_CREATE_DISCOUNT_CODES = (
  eventId: string,
  input: BulkCreateDiscountInput,
  options?: ServiceCallOptions
): Promise<ServiceResult<DiscountBulkResult>> =>
  wrap(async () => {
    const res = await discountApi.discountCodesControllerCreate(eventId, {
      type: input.type,
      value: input.value,
      quantity: input.quantity,
      maxUses: input.maxUses,
      maxUsesPerUser: input.maxUsesPerUser,
      validFrom: input.validFrom,
      validUntil: input.validUntil,
      bearer: input.bearer,
    })
    const data = unwrapApiPayload<DiscountBulkResult>(res.data)

    if (!data?.codes) throw createServiceError(texts.events.discountCreateFailed)

    return data
  }, options)

export const SET_DISCOUNT_CODE_ACTIVE = (
  codeId: string,
  isActive: boolean,
  options?: ServiceCallOptions
): Promise<ServiceResult<DiscountCode>> =>
  wrap(async () => {
    const res = await discountApi.discountCodesControllerUpdate(codeId, { isActive })
    const data = unwrapApiPayload<DiscountCode>(res.data)

    if (!data?.id) throw createServiceError(texts.events.discountUpdateFailed)

    return data
  }, options)

export const DELETE_DISCOUNT_CODE = (codeId: string, options?: ServiceCallOptions): Promise<ServiceResult<void>> =>
  wrap(async () => {
    await discountApi.discountCodesControllerRemove(codeId)
  }, options)

export const PREVIEW_DISCOUNT = (bookingId: string, code: string, options?: ServiceCallOptions): Promise<ServiceResult<DiscountPreview>> =>
  wrap(async () => {
    const res = await financialApi.paymentsControllerPreviewDiscount(bookingId, { code: code.trim() })
    const data = unwrapApiPayload<DiscountPreview>(res.data)

    if (!data?.code) throw createServiceError(texts.events.discountCodeInvalid)

    return data
  }, options)