import {
  Controller,
  Get,
  Patch,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
  Request,
  ParseUUIDPipe,
  ParseIntPipe,
  DefaultValuePipe,
} from '@nestjs/common';
import {
  ApiTags,
  ApiOperation,
  ApiResponse,
  ApiBearerAuth,
  ApiQuery,
} from '@nestjs/swagger';
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
import { InventoryService } from './inventory.service';
import { StoresService } from '../stores/stores.service';
import { UpdateInventoryItemDto } from './dto/update-inventory-item.dto';
import { AuthenticatedRequest } from '../../common/interfaces/authenticated-request.interface';

@ApiTags('inventory')
@ApiBearerAuth()
@UseGuards(JwtAuthGuard)
@Controller('stores/:storeId/inventory')
export class InventoryController {
  constructor(
    private readonly inventoryService: InventoryService,
    private readonly storesService: StoresService,
  ) {}

  @Get()
  @ApiOperation({ summary: 'Listar inventario de una tienda' })
  @ApiResponse({ status: 200, description: 'Lista de productos' })
  @ApiQuery({ name: 'page', required: false, type: Number })
  @ApiQuery({ name: 'limit', required: false, type: Number })
  async findAll(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
    @Query('page', new DefaultValuePipe(1), ParseIntPipe) page: number,
    @Query('limit', new DefaultValuePipe(50), ParseIntPipe) limit: number,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);

    const { items, total } = await this.inventoryService.findAllByStore(
      storeId,
      page,
      Math.min(limit, 100),
    );

    return {
      items,
      total,
      page,
      limit,
      hasMore: page * limit < total,
    };
  }

  @Get('statistics')
  @ApiOperation({ summary: 'Obtener estadisticas del inventario' })
  @ApiResponse({ status: 200, description: 'Estadisticas' })
  async getStatistics(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);
    return this.inventoryService.getStatistics(storeId);
  }

  @Get('low-stock')
  @ApiOperation({ summary: 'Obtener productos con bajo stock' })
  @ApiResponse({ status: 200, description: 'Lista de productos con bajo stock' })
  async getLowStock(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);
    return this.inventoryService.getLowStockItems(storeId);
  }

  @Get('categories')
  @ApiOperation({ summary: 'Obtener categorias del inventario' })
  @ApiResponse({ status: 200, description: 'Lista de categorias' })
  async getCategories(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);
    return this.inventoryService.getCategories(storeId);
  }

  @Get(':itemId')
  @ApiOperation({ summary: 'Obtener un producto' })
  @ApiResponse({ status: 200, description: 'Producto encontrado' })
  async findOne(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
    @Param('itemId', ParseUUIDPipe) itemId: string,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);
    return this.inventoryService.findById(storeId, itemId);
  }

  @Patch(':itemId')
  @ApiOperation({ summary: 'Actualizar un producto' })
  @ApiResponse({ status: 200, description: 'Producto actualizado' })
  async update(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
    @Param('itemId', ParseUUIDPipe) itemId: string,
    @Body() dto: UpdateInventoryItemDto,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);
    return this.inventoryService.update(storeId, itemId, dto, req.user.id);
  }

  @Delete(':itemId')
  @ApiOperation({ summary: 'Eliminar un producto' })
  @ApiResponse({ status: 200, description: 'Producto eliminado' })
  async delete(
    @Request() req: AuthenticatedRequest,
    @Param('storeId', ParseUUIDPipe) storeId: string,
    @Param('itemId', ParseUUIDPipe) itemId: string,
  ) {
    await this.storesService.verifyOwnership(storeId, req.user.id);
    return this.inventoryService.delete(storeId, itemId);
  }
}