import { Injectable } from '@nestjs/common'
import { ResponseMapper } from '../common/response/response-mapper'
import { Prisma } from '../generated/prisma/client'
import { PrismaService } from '../prisma/prisma.service'
import { CreatePurchaseReceiptDto } from './dto/create-purchase-receipt.dto'

@Injectable()
export class PurchaseReceiptsService {
  constructor(private prisma: PrismaService) {}

  async create(dto: CreatePurchaseReceiptDto) {
    const data: Prisma.PurchaseReceiptCreateInput = {
      code: dto.code,
      totalAmount: new Prisma.Decimal(dto.totalAmount),
      description: dto.description ?? null,
      supplier: { connect: { id: dto.supplierId } },
      inventory: { connect: { id: dto.inventoryId } },

      items: dto.items?.length
        ? {
            create: dto.items.map((item, idx) => {
              const mapped = {
                count: new Prisma.Decimal(item.count ?? 0),
                unitPrice: new Prisma.Decimal(item.unitPrice ?? 0),
                totalAmount: new Prisma.Decimal(item.totalAmount ?? 0),
                description: item.description ?? null,
                product: { connect: { id: item.productId } },
              }
              return mapped
            }),
          }
        : undefined,
    }
    const item = await this.prisma.purchaseReceipt.create({
      data,
      include: { items: true },
      omit: {
        supplierId: true,
        inventoryId: true,
      },
    })
    return ResponseMapper.create(item)
  }

  async findAll() {
    const items = await this.prisma.purchaseReceipt.findMany({
      include: { supplier: true, inventory: true },
    })
    return ResponseMapper.list(items)
  }

  async findOne(id: number) {
    const item = await this.prisma.purchaseReceipt.findUnique({
      where: { id },
      include: {
        supplier: {
          select: {
            id: true,
            firstName: true,
            lastName: true,
          },
        },
        inventory: {
          select: {
            id: true,
            name: true,
          },
        },
        items: true,
      },
    })
    if (!item) return null
    return ResponseMapper.single(item)
  }

  async update(id: number, data: any) {
    const payload: any = { ...data }
    if (Object.prototype.hasOwnProperty.call(payload, 'supplierId')) {
      if (payload.supplierId === null) payload.supplier = { disconnect: true }
      else payload.supplier = { connect: { id: Number(payload.supplierId) } }
      delete payload.supplierId
    }
    if (Object.prototype.hasOwnProperty.call(payload, 'inventoryId')) {
      if (payload.inventoryId === null) payload.inventory = { disconnect: true }
      else payload.inventory = { connect: { id: Number(payload.inventoryId) } }
      delete payload.inventoryId
    }

    const item = await this.prisma.purchaseReceipt.update({
      where: { id },
      data: payload,
    })
    return ResponseMapper.update(item)
  }

  async remove(id: number) {
    const item = await this.prisma.purchaseReceipt.delete({ where: { id } })
    return ResponseMapper.single(item)
  }
}