import { Inject, Injectable } from '@nestjs/common'
import { Pothos, PothosRef, PothosSchema, SchemaBuilderToken } from '@smatch-corp/nestjs-pothos'
import { Builder } from '../Graphql/graphql.builder'
import { PrismaService } from '../Prisma/prisma.service'
import { OrderStatus, PaymentStatus, RefundTicketStatus, Role } from '@prisma/client'
import { DateTimeUtils } from 'src/common/utils/datetime.utils'

@Injectable()
export class RefundTicketSchema extends PothosSchema {
  constructor(
    @Inject(SchemaBuilderToken) private readonly builder: Builder,
    private readonly prisma: PrismaService,
  ) {
    super()
  }

  // Types section
  @PothosRef()
  refundTicket() {
    return this.builder.prismaObject('RefundTicket', {
      fields: (t) => ({
        id: t.exposeID('id', {
          description: 'The ID of the refund ticket.',
        }),
        amount: t.exposeFloat('amount', {
          description: 'The amount of the refund ticket.',
        }),
        status: t.expose('status', {
          type: RefundTicketStatus,
          description: 'The status of the refund ticket.',
        }),
        createdAt: t.expose('createdAt', {
          type: 'DateTime',
          description: 'The date and time the refund ticket was created.',
        }),
        updatedAt: t.expose('updatedAt', {
          type: 'DateTime',
          description: 'The date and time the refund ticket was updated.',
        }),
        order: t.relation('order', {
          description: 'The order for the refund ticket.',
        }),
      }),
    })
  }

  @PothosRef()
  refundTicketAction() {
    return this.builder.enumType('RefundTicketAction', {
      description: 'The action to take on a refund ticket.',
      values: ['APPROVE', 'REJECT'],
    })
  }

  // Queries section
  @Pothos()
  init(): void {
    this.builder.queryFields((t) => ({
      refundTickets: t.prismaField({
        type: [this.refundTicket()],
        description: 'Retrieve a list of refund tickets with optional filtering, ordering, and pagination.',
        args: this.builder.generator.findManyArgs('RefundTicket'),
        resolve: async (query, _root, args, _ctx, _info) => {
          return await this.prisma.refundTicket.findMany({
            ...query,
            where: args.filter ?? undefined,
            orderBy: args.orderBy ?? undefined,
            cursor: args.cursor ?? undefined,
            take: args.take ?? undefined,
            skip: args.skip ?? undefined,
          })
        },
      }),
    }))
    this.builder.mutationFields((t) => ({
      requestRefund: t.prismaField({
        type: this.refundTicket(),
        description: 'Request a refund for an order.',
        args: {
          orderId: t.arg({
            type: 'String',
            required: true,
          }),
          reason: t.arg({
            type: 'String',
            required: true,
          }),
        },
        resolve: async (_query, _root, args, ctx, _info) => {
          if (ctx.isSubscription) {
            throw new Error('Subscription is not allowed')
          }
          if (ctx.http.me?.role !== Role.CUSTOMER) {
            throw new Error('Only customers can request refund')
          }
          // check if order exists
          const order = await this.prisma.order.findUnique({
            where: { id: args.orderId },
          })
          if (!order) {
            throw new Error('Order not found')
          }
          // check if order status is PAID
          if (order.status !== OrderStatus.PAID) {
            throw new Error('Order is not paid')
          }
          // check if order total is not null
          if (!order.total || order.total === 0) {
            throw new Error('Order total is null or free')
          }
          // calculate refund amount based on order time: if order is less than 24 hours, refund 100%, if more than 24 hours, less than 48 hours, refund 50%, if more than 72 hours, cannot refund
          const now = DateTimeUtils.now()
          const orderDate = DateTimeUtils.fromDate(order.createdAt)
          const diffTime = Math.abs(now.diff(orderDate).toMillis())
          const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24))
          let refundAmount = 0
          if (diffDays < 24) refundAmount = order.total
          else if (diffDays < 48) refundAmount = order.total * 0.5
          // create refund ticket
          const refundTicket = await this.prisma.refundTicket.create({
            data: {
              orderId: order.id,
              status: RefundTicketStatus.PENDING,
              amount: refundAmount,
            },
          })
          return refundTicket
        },
      }),
      processRefundTicket: t.prismaField({
        type: this.refundTicket(),
        description: 'Process a refund ticket, can only done by moderator',
        args: {
          refundTicketId: t.arg({
            type: 'String',
            required: true,
          }),
          action: t.arg({
            type: this.refundTicketAction(),
            required: true,
          }),
        },
        resolve: async (_query, _root, args, ctx, _info) => {
          if (ctx.isSubscription) {
            throw new Error('Subscription is not allowed')
          }
          if (ctx.http.me?.role !== Role.MODERATOR) {
            throw new Error('Only moderators can process refund tickets')
          }
          // update refund ticket status
          const refundTicket = await this.prisma.refundTicket.update({
            where: { id: args.refundTicketId },
            data: { status: args.action === 'APPROVE' ? RefundTicketStatus.APPROVED : RefundTicketStatus.REJECTED },
          })
          return refundTicket
        },
      }),
    }))
  }
}