package handler

import (
	"fmt"
	"net/http"
	"os"

	"soul-api/internal/database"
	"soul-api/internal/model"
	"soul-api/internal/wechat"

	"github.com/gin-gonic/gin"
)

// WithdrawPost POST /api/withdraw 创建提现申请并发起微信转账
func WithdrawPost(c *gin.Context) {
	var req struct {
		UserID   string  `json:"userId" binding:"required"`
		Amount   float64 `json:"amount" binding:"required"`
		UserName string  `json:"userName"` // 可选，实名校验用
		Remark   string  `json:"remark"`
	}
	
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "参数错误"})
		return
	}

	// 金额验证
	if req.Amount <= 0 {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "提现金额必须大于0"})
		return
	}
	if req.Amount < 1 {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "最低提现金额为1元"})
		return
	}

	db := database.DB()
	
	// 查询用户信息，获取 openid 和待提现金额
	var user model.User
	if err := db.Where("id = ?", req.UserID).First(&user).Error; err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "用户不存在"})
		return
	}

	if user.OpenID == nil || *user.OpenID == "" {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "用户未绑定微信"})
		return
	}

	// 检查待结算收益是否足够
	pendingEarnings := 0.0
	if user.PendingEarnings != nil {
		pendingEarnings = *user.PendingEarnings
	}
	
	if pendingEarnings < req.Amount {
		c.JSON(http.StatusBadRequest, gin.H{
			"success": false,
			"message": fmt.Sprintf("可提现金额不足（当前：%.2f元）", pendingEarnings),
		})
		return
	}

	// 生成转账单号
	outBatchNo := wechat.GenerateTransferBatchNo()
	outDetailNo := wechat.GenerateTransferDetailNo()
	
	// 创建提现记录
	status := "pending"
	remark := req.Remark
	if remark == "" {
		remark = "提现"
	}
	
	withdrawal := model.Withdrawal{
		ID:          outDetailNo,
		UserID:      req.UserID,
		Amount:      req.Amount,
		Status:      &status,
		BatchNo:     &outBatchNo,
		DetailNo:    &outDetailNo,
		Remark:      &remark,
	}
	
	if err := db.Create(&withdrawal).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"success": false, "message": "创建提现记录失败"})
		return
	}

	// 发起微信转账
	transferAmount := int(req.Amount * 100) // 转为分
	transferParams := wechat.TransferParams{
		OutBatchNo:  outBatchNo,
		OutDetailNo: outDetailNo,
		OpenID:      *user.OpenID,
		Amount:      transferAmount,
		UserName:    req.UserName,
		Remark:      remark,
		BatchName:   "用户提现",
		BatchRemark: fmt.Sprintf("用户 %s 提现 %.2f 元", req.UserID, req.Amount),
	}
	
	result, err := wechat.InitiateTransfer(transferParams)
	if err != nil {
		// 转账失败，更新提现状态为失败
		failedStatus := "failed"
		failReason := fmt.Sprintf("发起转账失败: %v", err)
		db.Model(&withdrawal).Updates(map[string]interface{}{
			"status":      failedStatus,
			"fail_reason": failReason,
		})
		
		c.JSON(http.StatusInternalServerError, gin.H{
			"success": false,
			"message": "发起转账失败，请稍后重试",
			"error":   err.Error(),
		})
		return
	}

	// 更新提现记录状态
	processingStatus := "processing"
	batchID := result.BatchID
	db.Model(&withdrawal).Updates(map[string]interface{}{
		"status":   processingStatus,
		"batch_id": batchID,
	})

	// 扣减用户的待结算收益，增加已提现金额
	db.Model(&user).Updates(map[string]interface{}{
		"pending_earnings":   db.Raw("pending_earnings - ?", req.Amount),
		"withdrawn_earnings": db.Raw("COALESCE(withdrawn_earnings, 0) + ?", req.Amount),
	})

	fmt.Printf("[Withdraw] 用户 %s 提现 %.2f 元，转账批次号: %s\n", req.UserID, req.Amount, outBatchNo)

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"message": "提现申请已提交，预计2小时内到账",
		"data": map[string]interface{}{
			"id":           withdrawal.ID,
			"amount":       req.Amount,
			"status":       processingStatus,
			"out_batch_no": outBatchNo,
			"batch_id":     result.BatchID,
			"created_at":   withdrawal.CreatedAt,
		},
	})
}

// WithdrawRecords GET /api/withdraw/records?userId= 当前用户提现记录（GORM）
func WithdrawRecords(c *gin.Context) {
	userId := c.Query("userId")
	if userId == "" {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "缺少 userId"})
		return
	}
	var list []model.Withdrawal
	if err := database.DB().Where("user_id = ?", userId).Order("created_at DESC").Limit(100).Find(&list).Error; err != nil {
		c.JSON(http.StatusOK, gin.H{"success": true, "data": gin.H{"list": []interface{}{}}})
		return
	}
	out := make([]gin.H, 0, len(list))
	for _, w := range list {
		st := ""
		if w.Status != nil {
			st = *w.Status
		}
		out = append(out, gin.H{
			"id": w.ID, "amount": w.Amount, "status": st,
			"createdAt": w.CreatedAt, "processedAt": w.ProcessedAt,
		})
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "data": gin.H{"list": out}})
}

// WithdrawPendingConfirm GET /api/withdraw/pending-confirm?userId= 待确认/处理中收款列表
// 返回 pending、processing、pending_confirm 的提现，供小程序展示；并返回 mchId、appId 供确认收款用
func WithdrawPendingConfirm(c *gin.Context) {
	userId := c.Query("userId")
	if userId == "" {
		c.JSON(http.StatusBadRequest, gin.H{"success": false, "message": "缺少 userId"})
		return
	}
	db := database.DB()
	var list []model.Withdrawal
	// 进行中的提现：待处理、处理中、待确认收款（与 next 的 pending_confirm 兼容）
	if err := db.Where("user_id = ? AND status IN ?", userId, []string{"pending", "processing", "pending_confirm"}).
		Order("created_at DESC").
		Find(&list).Error; err != nil {
		list = nil
	}
	out := make([]gin.H, 0, len(list))
	for _, w := range list {
		item := gin.H{
			"id":        w.ID,
			"amount":    w.Amount,
			"createdAt": w.CreatedAt,
		}
		// 若有 package 信息（requestMerchantTransfer 用），一并返回；当前直接打款无 package，给空字符串
		item["package"] = ""
		out = append(out, item)
	}
	mchId := os.Getenv("WECHAT_MCH_ID")
	if mchId == "" {
		mchId = "1318592501"
	}
	appId := os.Getenv("WECHAT_APPID")
	if appId == "" {
		appId = "wxb8bbb2b10dec74aa"
	}
	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"data": gin.H{
			"list":   out,
			"mchId":  mchId,
			"appId":  appId,
		},
	})
}