feat(cardex): implement cardex controller, service, and DTO for stock movements

feat(pos): add POS controller and service for order creation and stock retrieval
refactor(pos): enhance stock and product category retrieval with pagination and mapping

src/modules/pos/dto/create-pos.dto.ts

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+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger'
+import { ArrayMinSize, IsNumber, IsOptional } from 'class-validator'
+
+export class CreateOrderDto {
+  @ApiProperty()
+  @IsNumber()
+  @IsOptional()
+  customerId?: number
+
+  @ApiPropertyOptional()
+  @ArrayMinSize(1)
+  items: CreateOrderItemDto[]
+}
+
+export class CreateOrderItemDto {
+  @ApiProperty()
+  @IsNumber()
+  productId: number
+
+  @ApiProperty()
+  @IsNumber()
+  count: number
+
+  @ApiProperty()
+  @IsNumber()
+  fee: number
+}

src/modules/pos/dto/update-pos.dto.ts

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+import { ApiPropertyOptional } from '@nestjs/swagger'
+import { Type } from 'class-transformer'
+import { IsBoolean, IsOptional, IsString } from 'class-validator'
+
+export class UpdateInventoryDto {
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  name?: string
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @IsString()
+  location?: string
+
+  @ApiPropertyOptional()
+  @IsOptional()
+  @Type(() => Boolean)
+  @IsBoolean()
+  isActive?: boolean
+}

src/modules/pos/pos.controller.ts

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+import { Body, Controller, Get, Post } from '@nestjs/common'
+import { CreateOrderDto } from './dto/create-pos.dto'
+import { PosService } from './pos.service'
+
+@Controller('pos')
+export class PosController {
+  constructor(private readonly posService: PosService) {}
+
+  @Get()
+  getInfo() {
+    return this.posService.getInfo()
+  }
+
+  @Get('/stock')
+  async getStock() {
+    const inventoryId = await this.posService.getDefaultInventoryId()
+    return this.posService.getStock(inventoryId!)
+  }
+
+  @Get('/product-categories')
+  async getProductCategories() {
+    const inventoryId = await this.posService.getDefaultInventoryId()
+    return this.posService.getProductCategories(inventoryId!)
+  }
+
+  @Post('/orders/create')
+  async createOrder(@Body() dto: CreateOrderDto) {
+    const inventoryId = await this.posService.getDefaultInventoryId()
+
+    return this.posService.createOrder(dto, inventoryId!)
+  }
+
+  // @Post()
+  // create(@Body() dto: CreateInventoryDto) {
+  //   return this.inventoriesService.create(dto)
+  // }
+
+  // @Get()
+  // @ApiQuery({ name: 'isPointOfSale', required: false, type: Boolean })
+  // findAll(@Query('isPointOfSale') isPointOfSale?: boolean) {
+  //   return this.inventoriesService.findAll(isPointOfSale)
+  // }
+
+  // @Get(':id')
+  // findOne(@Param('id') id: string) {
+  //   return this.inventoriesService.findOne(Number(id))
+  // }
+
+  // @Patch(':id')
+  // update(@Param('id') id: string, @Body() dto: UpdateInventoryDto) {
+  //   return this.inventoriesService.update(Number(id), dto)
+  // }
+
+  // @Delete(':id')
+  // remove(@Param('id') id: string) {
+  //   return this.inventoriesService.remove(Number(id))
+  // }
+
+  // @Get(':id/movements')
+  // @ApiQuery({ name: 'type', required: false, enum: MovementType })
+  // findInventoryMovements(@Param('id') id: string, @Query('type') type?: MovementType) {
+  //   return this.inventoriesService.findInventoryMovements(Number(id), type ?? undefined)
+  // }
+
+  // @Get(':id/stock')
+  // @ApiQuery({ name: 'isAvailable', required: false, type: Boolean })
+  // getStock(@Param('id') id: string, @Query('isAvailable') isAvailable?: boolean) {
+  //   return this.inventoriesService.getStock(Number(id), isAvailable ?? undefined)
+  // }
+
+  // @Get(':id/products/:productId/cardex')
+  // getProductCardex(@Param('id') id: string, @Param('productId') productId: string) {
+  //   return this.inventoriesService.getProductCardex(Number(id), Number(productId))
+  // }
+}

src/modules/pos/pos.module.ts

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+import { Module } from '@nestjs/common'
+import { PrismaModule } from '../../prisma/prisma.module'
+import { PosController } from './pos.controller'
+import { PosService } from './pos.service'
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [PosController],
+  providers: [PosService],
+})
+export class PosModule {}

src/modules/pos/pos.service.ts

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+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 { CreateOrderDto } from './dto/create-pos.dto'
+
+@Injectable()
+export class PosService {
+  constructor(private prisma: PrismaService) {}
+
+  async getDefaultInventoryId() {
+    const inventory = await this.prisma.inventory.findFirst({
+      where: { isPointOfSale: true },
+      select: { id: true },
+    })
+    return inventory?.id || null
+  }
+
+  async getInfo() {
+    const info = await this.prisma.inventory.findFirst({
+      where: { isPointOfSale: true },
+      select: {
+        id: true,
+        name: true,
+      },
+    })
+
+    return ResponseMapper.single({ store: info })
+  }
+
+  async getStock(inventoryId: number, isAvailable?: boolean, page = 1, pageSize = 50) {
+    const query: Prisma.StockBalanceFindManyArgs = {
+      where: {
+        inventoryId,
+        quantity:
+          isAvailable === true
+            ? { gt: 0 }
+            : isAvailable === false
+              ? { lte: 0 }
+              : undefined,
+      },
+    }
+    const [items, count] = await this.prisma.$transaction([
+      this.prisma.stockBalance.findMany({
+        where: query.where,
+        include: {
+          product: {
+            select: {
+              id: true,
+              name: true,
+              sku: true,
+              salePrice: true,
+              category: {
+                select: { id: true, name: true },
+              },
+            },
+          },
+        },
+        orderBy: {
+          quantity: 'desc',
+        },
+        skip: (page - 1) * pageSize,
+        take: pageSize,
+      }),
+      this.prisma.stockBalance.count({ where: query.where }),
+    ])
+
+    const mapped = items.map(item => ({
+      id: item.id,
+      quantity: Number(item.quantity),
+      product: item.product,
+    }))
+
+    return ResponseMapper.paginate(mapped, count, page, pageSize)
+  }
+
+  async getProductCategories(inventoryId: number) {
+    const balances = await this.prisma.stockBalance.findMany({
+      where: { inventoryId },
+      select: {
+        product: { select: { id: true, category: { select: { id: true, name: true } } } },
+        quantity: true,
+      },
+    })
+
+    const map = new Map<
+      number,
+      { id: number; name: string; totalQuantity: number; productCount: number }
+    >()
+
+    for (const b of balances) {
+      const product = b.product
+      const cat = product?.category
+      if (!cat) continue // skip products without category
+      const existing = map.get(cat.id)
+      if (existing) {
+        existing.totalQuantity += Number(b.quantity)
+        existing.productCount += 1
+      } else {
+        map.set(cat.id, {
+          id: cat.id,
+          name: cat.name,
+          totalQuantity: Number(b.quantity),
+          productCount: 1,
+        })
+      }
+    }
+
+    const categories = Array.from(map.values())
+    return ResponseMapper.list(categories)
+  }
+
+  async createOrder(data: CreateOrderDto, inventoryId: number) {
+    const { customerId, ...res } = data
+    const preparedOrder = { ...res } as any
+    const lastCode = await this.prisma.salesInvoice
+      .findFirst({
+        orderBy: { code: 'desc' },
+        select: { code: true },
+      })
+      .then(si => si?.code || '0')
+
+    preparedOrder.code = String(Number(lastCode) + 1)
+
+    preparedOrder.totalAmount = data.items.reduce(
+      (acc, item) => acc + Number(item.fee),
+      0,
+    )
+
+    preparedOrder.inventory = { connect: { id: inventoryId } }
+    preparedOrder.customer = { connect: { id: customerId } }
+
+    if (Object.prototype.hasOwnProperty.call(preparedOrder, 'items')) {
+      preparedOrder.items = {
+        create: preparedOrder.items.map((item: any) => ({
+          product: { connect: { id: Number(item.productId) } },
+          count: item.count,
+          fee: item.fee,
+          total: item.count * item.fee,
+        })),
+      }
+    }
+
+    const item = await this.prisma.salesInvoice.create({ data: preparedOrder })
+    return ResponseMapper.create(item)
+  }
+}