package main

import (
	"database/sql"
	"fmt"
	"log"

	_ "github.com/go-sql-driver/mysql"
)

func main() {
	// 连接数据库
	dsn := "root:bindbox2025kdy@tcp(150.158.78.154:3306)/dev_game?parseTime=true"
	db, err := sql.Open("mysql", dsn)
	if err != nil {
		log.Fatal("连接失败:", err)
	}
	defer db.Close()

	fmt.Println("=== 优惠券 ID 275 当前状态 ===")
	var ucID, userID, couponID int64
	var status int32
	var balanceAmount int64
	var usedOrderID sql.NullInt64
	var usedAt sql.NullTime
	err = db.QueryRow("SELECT id, user_id, coupon_id, status, balance_amount, used_order_id, used_at FROM user_coupons WHERE id = 275").Scan(
		&ucID, &userID, &couponID, &status, &balanceAmount, &usedOrderID, &usedAt,
	)
	if err != nil {
		log.Println("查询优惠券失败:", err)
	} else {
		fmt.Printf("用户券ID: %d | 用户ID: %d | 模板ID: %d | 状态: %d | 余额(分): %d | 使用订单ID: %v | 使用时间: %v\n",
			ucID, userID, couponID, status, balanceAmount, usedOrderID, usedAt)
	}

	// 查询系统券模板
	fmt.Println("\n=== 系统优惠券模板 ===")
	var scID int64
	var scName string
	var discountType int32
	var discountValue int64
	err = db.QueryRow("SELECT id, name, discount_type, discount_value FROM system_coupons WHERE id = ?", couponID).Scan(&scID, &scName, &discountType, &discountValue)
	if err == nil {
		fmt.Printf("模板ID: %d | 名称: %s | 类型: %d | 面值(分): %d\n", scID, scName, discountType, discountValue)
	}

	fmt.Println("\n=== 优惠券 ID 275 的所有流水记录 ===")
	rows, err := db.Query(`
		SELECT id, user_id, user_coupon_id, change_amount, balance_after, order_id, action, created_at 
		FROM user_coupon_ledger 
		WHERE user_coupon_id = 275 
		ORDER BY created_at DESC
	`)
	if err != nil {
		log.Println("查询流水失败:", err)
	} else {
		defer rows.Close()
		for rows.Next() {
			var id, userID, userCouponID, changeAmount, balanceAfter, orderID int64
			var action string
			var createdAt sql.NullTime
			rows.Scan(&id, &userID, &userCouponID, &changeAmount, &balanceAfter, &orderID, &action, &createdAt)
			fmt.Printf("流水ID: %d | 变动: %d分 | 余额: %d分 | 订单ID: %d | 动作: %s | 时间: %v\n",
				id, changeAmount, balanceAfter, orderID, action, createdAt)
		}
	}

	fmt.Println("\n=== order_coupons 表中使用优惠券 275 的记录 ===")
	rows2, err := db.Query(`
		SELECT oc.id, oc.order_id, oc.user_coupon_id, oc.applied_amount, oc.created_at,
		       o.order_no, o.status, o.total_amount, o.discount_amount, o.actual_amount
		FROM order_coupons oc
		LEFT JOIN orders o ON o.id = oc.order_id
		WHERE oc.user_coupon_id = 275
		ORDER BY oc.created_at DESC
	`)
	if err != nil {
		log.Println("查询 order_coupons 失败:", err)
	} else {
		defer rows2.Close()
		for rows2.Next() {
			var id, orderID, userCouponID, appliedAmount int64
			var createdAt sql.NullTime
			var orderNo sql.NullString
			var orderStatus sql.NullInt32
			var totalAmount, discountAmount, actualAmount sql.NullInt64
			rows2.Scan(&id, &orderID, &userCouponID, &appliedAmount, &createdAt, &orderNo, &orderStatus, &totalAmount, &discountAmount, &actualAmount)
			fmt.Printf("记录ID: %d | 订单ID: %d | 订单号: %v | 扣减金额: %d分 | 时间: %v\n",
				id, orderID, orderNo.String, appliedAmount, createdAt)
		}
	}

	// 计算总扣减金额
	var totalApplied int64
	db.QueryRow("SELECT COALESCE(SUM(applied_amount), 0) FROM order_coupons WHERE user_coupon_id = 275").Scan(&totalApplied)
	fmt.Printf("\n=== 统计 ===\n优惠券 275 累计扣减: %d 分 (%.2f 元)\n", totalApplied, float64(totalApplied)/100)
	fmt.Printf("当前余额: %d 分 (%.2f 元)\n", balanceAmount, float64(balanceAmount)/100)
}