import { z } from 'zod'

import type {
  CreatePaymentResponseDto,
  PaymentCheckoutResponseDto,
  PaymentReceiptResponseDto,
  PaymentResponseDto,
} from '@/api/generated/models'
import type { BookingStatus } from '@/api/generated/models'
import {
  createServiceError,
  errorResult,
  handleServiceError,
  type ServiceCallOptions,
  type ServiceResult,
  shouldBubbleErrorToParent,
  successResult,
} from '@/services/errorHandler'
import { unwrapApiData } from '@/services/apiResponse'
import { getBookings } from '@/api/generated/bookings/bookings'
import { getEvents } from '@/api/generated/events/events'
import { getFinancial } from '@/api/generated/financial/financial'
import { unwrapApiPayload } from '@/helpers/listResponse'
import { texts } from '@/texts'

// docs/workflows/fa/payment.md — consumer checkout for a `pending_payment`
// booking. Payment creation is a *second, separate* call from booking
// creation (owned by saza2's services/bookings.ts) — this file only covers
// the payment leg: reading the booking/event to render the checkout
// screen, then POST /bookings/:bookingId/payments.

export interface BookingForPayment {
  id: string
  eventId: string
  bookingCode: string
  status: BookingStatus
  expiresAt: string | null
}

export interface EventSummaryForPayment {
  id: string
  slug?: string | null
  title: string
  price: number
}

export type PaymentCheckout = PaymentCheckoutResponseDto

export type Payment = PaymentResponseDto

// Orval snapshot may lag backend fields returned at runtime for checkout.
export type CreatePaymentResult = CreatePaymentResponseDto & {
  depositId?: string | null
  depositAmount?: number
  walletBalanceUsed?: number
}

export type PaymentReceipt = PaymentReceiptResponseDto

const bookingForPaymentSchema = z.object({
  id: z.string().min(1),
  eventId: z.string().min(1),
  bookingCode: z.string(),
  status: z.enum(['pending_payment', 'confirmed', 'cancelled', 'expired', 'refunded', 'no_show']),
  expiresAt: z.string().nullable(),
})

const paymentReceiptSchema = z.object({
  id: z.string().min(1),
  paymentId: z.string().min(1),
  userId: z.string().min(1),
  bookingId: z.string().min(1),
  eventId: z.string().min(1),
  receiptCode: z.string(),
  snapshot: z.record(z.string(), z.unknown()),
  issuedAt: z.string(),
})

const bookingsApi = getBookings()
const eventsApi = getEvents()
const financialApi = getFinancial()

export const GET_BOOKING_FOR_PAYMENT = async (
  bookingId: string,
  options?: ServiceCallOptions
): Promise<ServiceResult<BookingForPayment>> => {
  try {
    const res = await bookingsApi.bookingsControllerFindOne(bookingId)
    const parsed = bookingForPaymentSchema.safeParse(unwrapApiPayload(res.data))

    if (!parsed.success) throw createServiceError(texts.common.invalidServerResponse)

    return successResult(parsed.data)
  } catch (error) {
    const normalizedError = handleServiceError(error, options)

    if (shouldBubbleErrorToParent(options)) {
      throw normalizedError
    }

    return errorResult(normalizedError)
  }
}

// Booking detail (GET /bookings/:id) intentionally doesn't carry the
// event's price/title — only `eventId` — so the checkout screen needs a
// second read against the public event-detail endpoint.
export const GET_EVENT_SUMMARY = async (eventId: string, options?: ServiceCallOptions): Promise<ServiceResult<EventSummaryForPayment>> => {
  try {
    const res = await eventsApi.eventsControllerFindOne(eventId)
    const payload = unwrapApiPayload(res.data)

    if (!payload?.id) {
      throw createServiceError(texts.common.invalidServerResponse)
    }

    return successResult({
      id: payload.id as string,
      slug: typeof payload.slug === 'string' ? payload.slug : null,
      title: payload.title as string,
      price: Number(payload.price ?? 0),
    })
  } catch (error) {
    const normalizedError = handleServiceError(error, options)

    if (shouldBubbleErrorToParent(options)) {
      throw normalizedError
    }

    return errorResult(normalizedError)
  }
}

// payment.md "تصمیم ۲": `walletAmount` is a single clamp-friendly number —
// the backend clamps to min(requested, wallet.balance, totalAmount)
// regardless, so the frontend just sends what the "use wallet" toggle
// implies.
export const CREATE_PAYMENT = async (
  bookingId: string,
  walletAmount: number,
  options?: ServiceCallOptions & { discountCode?: string }
): Promise<ServiceResult<CreatePaymentResult>> => {
  try {
    const res = await financialApi.paymentsControllerCreate(bookingId, {
      walletAmount,
      discountCode: options?.discountCode?.trim() || undefined,
    })
    const payload = res.data

    if (!payload.success) {
      throw createServiceError(payload.message || texts.wallet.paymentFailed)
    }

    const result = unwrapApiData(payload)

    if (!result?.id) {
      throw createServiceError(texts.common.invalidServerResponse)
    }

    return successResult(result)
  } catch (error) {
    const normalizedError = handleServiceError(error, options)

    if (shouldBubbleErrorToParent(options)) {
      throw normalizedError
    }

    return errorResult(normalizedError)
  }
}

export const GET_PAYMENT_RECEIPT = async (paymentId: string, options?: ServiceCallOptions): Promise<ServiceResult<PaymentReceipt>> => {
  try {
    const res = await financialApi.paymentsControllerReceipt(paymentId)
    const parsed = paymentReceiptSchema.safeParse(unwrapApiPayload(res.data))

    if (!parsed.success) throw createServiceError(texts.common.invalidServerResponse)

    return successResult(parsed.data)
  } catch (error) {
    const normalizedError = handleServiceError(error, options)

    if (shouldBubbleErrorToParent(options)) {
      throw normalizedError
    }

    return errorResult(normalizedError)
  }
}