import { Injectable } from '@nestjs/common'
import { ShortEntity } from '../common/interfaces/response-models'
import { ResponseMapper } from '../common/response/response-mapper'
import { PrismaService } from '../prisma/prisma.service'

@Injectable()
export class InventoriesService {
  constructor(private prisma: PrismaService) {}
  async create(data: any) {
    const item = await this.prisma.inventory.create({ data })
    return ResponseMapper.create(item)
  }

  async findAll() {
    const items = await this.prisma.inventory.findMany({
      include: { productCharges: { include: { product: true } } },
    })

    const mapped = items.map(i => {
      const productsMap: Record<number, ShortEntity> = {}
      for (const pc of i.productCharges ?? []) {
        if (pc.product) {
          productsMap[pc.product.id] = { id: pc.product.id, name: pc.product.name }
        }
      }
      const groupedProducts = Object.values(productsMap)
      const { productCharges, ...rest } = i as any
      return { ...rest, groupedProducts }
    })

    return ResponseMapper.list(mapped)
  }

  async findOne(id: number) {
    const item = await this.prisma.inventory.findUnique({
      where: { id },
      include: { productCharges: { include: { product: true } } },
    })
    if (!item) return null
    const productsMap: Record<number, { id: number; name: string; count: number }> = {}
    for (const pc of item.productCharges ?? []) {
      const pid = pc.productId
      const pname = pc.product?.name ?? `#${pid}`
      if (!productsMap[pid]) productsMap[pid] = { id: pid, name: pname, count: 0 }
      productsMap[pid].count += Number(pc.count)
    }

    const productsWithCount = Object.values(productsMap)
    const groupedProducts: ShortEntity[] = productsWithCount.map(p => ({
      id: p.id,
      name: p.name,
    }))

    const { productCharges, ...rest } = item as any
    const itemWithCounts = {
      ...rest,
      products: productsWithCount,
      groupedProducts,
    }
    return ResponseMapper.single(itemWithCounts)
  }

  async update(id: number, data: any) {
    const item = await this.prisma.inventory.update({ where: { id }, data })
    return ResponseMapper.update(item)
  }

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