package com.ycwl.basic.controller.mobile;

import com.ycwl.basic.constant.BaseContextHandler;
import com.ycwl.basic.utils.ApiResponse;
import com.ycwl.basic.pricing.dto.*;
import com.ycwl.basic.pricing.service.IPriceCalculationService;
import com.ycwl.basic.service.pc.FaceService;
import com.ycwl.basic.service.PriceCacheService;
import com.ycwl.basic.model.pc.face.resp.FaceRespVO;
import com.ycwl.basic.dto.MobileOrderRequest;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;

import java.math.BigDecimal;

/**
 * 移动端订单控制器V2
 * 包含价格查询和订单管理功能
 */
@Slf4j
@RestController
@RequestMapping("/api/mobile/order/v2")
@RequiredArgsConstructor
public class AppOrderV2Controller {
    
    private final IPriceCalculationService priceCalculationService;
    private final FaceService faceService;
    private final PriceCacheService priceCacheService;
    
    /**
     * 移动端价格计算
     * 包含权限验证：验证人脸所属景区与当前用户匹配
     * 集成Redis缓存机制，提升查询性能
     */
    @PostMapping("/calculate")
    public ApiResponse<PriceCalculationResult> calculatePrice(@RequestBody MobilePriceCalculationRequest request) {
        // 获取当前登录用户ID
        String currentUserIdStr = BaseContextHandler.getUserId();
        if (currentUserIdStr == null) {
            log.warn("移动端价格计算：用户未登录");
            return ApiResponse.fail("用户未登录");
        }
        
        Long currentUserId = Long.valueOf(currentUserIdStr);
        log.info("移动端价格计算请求: userId={}, faceId={}, products={}", 
                currentUserId, request.getFaceId(), request.getProducts().size());
        
        // 验证faceId参数
        if (request.getFaceId() == null) {
            log.warn("移动端价格计算：faceId参数缺失");
            return ApiResponse.fail("faceId参数不能为空");
        }
        
        // 查询人脸信息进行权限验证
        ApiResponse<FaceRespVO> faceResponse = faceService.getById(request.getFaceId());
        if (!faceResponse.isSuccess() || faceResponse.getData() == null) {
            log.warn("移动端价格计算：人脸信息不存在, faceId={}", request.getFaceId());
            return ApiResponse.fail("人脸信息不存在");
        }
        
        FaceRespVO face = faceResponse.getData();
        Long scenicId = face.getScenicId();

        // 先尝试从Redis缓存获取价格计算结果
        PriceCalculationResult cachedResult = priceCacheService.getCachedPriceResult(
                currentUserId, scenicId, request.getProducts());
        
        if (cachedResult != null) {
            log.info("命中价格缓存: userId={}, scenicId={}, finalAmount={}", 
                    currentUserId, scenicId, cachedResult.getFinalAmount());
            return ApiResponse.success(cachedResult);
        }

        // 转换为标准价格计算请求
        PriceCalculationRequest standardRequest = request.toStandardRequest(currentUserId, scenicId);
        
        // 执行价格计算
        PriceCalculationResult result = priceCalculationService.calculatePrice(standardRequest);
        
        // 将计算结果缓存到Redis
        String cacheKey = priceCacheService.cachePriceResult(currentUserId, scenicId, request.getProducts(), result);
        
        log.info("移动端价格计算完成: userId={}, scenicId={}, originalAmount={}, finalAmount={}, cacheKey={}", 
                currentUserId, scenicId, result.getOriginalAmount(), result.getFinalAmount(), cacheKey);
        
        return ApiResponse.success(result);
    }
    
    /**
     * 移动端下单接口
     * 验证价格缓存有效性，确保5分钟内使用缓存价格下单
     */
    @PostMapping("/add-order")
    public ApiResponse<String> addOrder(@RequestBody MobileOrderRequest request) {
        // 获取当前登录用户ID
        String currentUserIdStr = BaseContextHandler.getUserId();
        if (currentUserIdStr == null) {
            log.warn("移动端下单：用户未登录");
            return ApiResponse.fail("用户未登录");
        }
        
        Long currentUserId = Long.valueOf(currentUserIdStr);
        log.info("移动端下单请求: userId={}, faceId={}, products={}, expectedFinalAmount={}", 
                currentUserId, request.getFaceId(), request.getProducts().size(), request.getExpectedFinalAmount());
        
        // 验证必填参数
        if (request.getFaceId() == null) {
            log.warn("移动端下单：faceId参数缺失");
            return ApiResponse.fail("faceId参数不能为空");
        }
        
        if (request.getProducts() == null || request.getProducts().isEmpty()) {
            log.warn("移动端下单：商品列表为空");
            return ApiResponse.fail("商品列表不能为空");
        }
        
        if (request.getExpectedFinalAmount() == null) {
            log.warn("移动端下单：预期价格参数缺失");
            return ApiResponse.fail("预期价格不能为空");
        }
        
        // 查询人脸信息进行权限验证
        ApiResponse<FaceRespVO> faceResponse = faceService.getById(request.getFaceId());
        if (!faceResponse.isSuccess() || faceResponse.getData() == null) {
            log.warn("移动端下单：人脸信息不存在, faceId={}", request.getFaceId());
            return ApiResponse.fail("人脸信息不存在");
        }
        
        FaceRespVO face = faceResponse.getData();
        Long scenicId = face.getScenicId();
        
        // 验证并消费价格缓存（一次性使用）
        PriceCalculationResult cachedResult = priceCacheService.validateAndConsumePriceCache(
                currentUserId, scenicId, request.getProducts());
        
        if (cachedResult == null) {
            log.warn("移动端下单：价格缓存已过期或不存在, userId={}, scenicId={}", currentUserId, scenicId);
            return ApiResponse.fail("价格信息已过期，请重新查询价格后再下单");
        }
        
        // 验证价格是否匹配
        if (cachedResult.getFinalAmount().compareTo(request.getExpectedFinalAmount()) != 0) {
            log.warn("移动端下单：价格不匹配, cached={}, expected={}, userId={}, scenicId={}", 
                    cachedResult.getFinalAmount(), request.getExpectedFinalAmount(), currentUserId, scenicId);
            return ApiResponse.fail("价格信息不匹配，请重新查询价格后再下单");
        }
        
        // 验证原价是否匹配（可选）
        if (request.getExpectedOriginalAmount() != null && 
            cachedResult.getOriginalAmount().compareTo(request.getExpectedOriginalAmount()) != 0) {
            log.warn("移动端下单：原价不匹配, cached={}, expected={}, userId={}, scenicId={}", 
                    cachedResult.getOriginalAmount(), request.getExpectedOriginalAmount(), currentUserId, scenicId);
            return ApiResponse.fail("原价信息不匹配，请重新查询价格后再下单");
        }
        
        log.info("价格缓存验证通过: userId={}, scenicId={}, finalAmount={}", 
                currentUserId, scenicId, cachedResult.getFinalAmount());
        
        // TODO: 实现订单创建逻辑
        // 1. 生成订单号
        // 2. 创建订单基础信息
        // 3. 保存订单商品明细
        // 4. 记录使用的优惠券和券码信息
        // 5. 更新优惠券和券码状态
        // 6. 初始化订单状态为待支付
        // 7. 发送订单创建成功通知
        
        String orderId = "ORDER_" + System.currentTimeMillis(); // 临时订单号生成逻辑
        
        log.info("移动端订单创建成功: orderId={}, userId={}, scenicId={}, finalAmount={}", 
                orderId, currentUserId, scenicId, cachedResult.getFinalAmount());
        
        return ApiResponse.success(orderId);
    }
}