package handlers

import (
	"awesomeProject/internal/common"
	"awesomeProject/internal/models"
	"net/http"
	"strconv"

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

// UserAddressHandler 用户收货地址处理器
type UserAddressHandler struct{}

// GetAddressList 获取用户收货地址列表
func (h *UserAddressHandler) GetAddressList(c *gin.Context) {
	currentUser, _ := c.Get("current_user")
	user := currentUser.(models.User)

	var addresses []models.UserAddress
	err := common.GetDB().Where("user_id = ?", user.ID).Order("is_default DESC, created_at DESC").Find(&addresses).Error
	if err != nil {
		c.JSON(http.StatusOK, common.Error(500, "获取收货地址失败"))
		return
	}

	c.JSON(http.StatusOK, common.Success(addresses))
}

// GetAddress 获取单个收货地址
func (h *UserAddressHandler) GetAddress(c *gin.Context) {
	currentUser, _ := c.Get("current_user")
	user := currentUser.(models.User)

	addressID, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusOK, common.Error(400, "地址ID无效"))
		return
	}

	var address models.UserAddress
	err = common.GetDB().Where("id = ? AND user_id = ?", addressID, user.ID).First(&address).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusOK, common.Error(404, "收货地址不存在"))
		} else {
			c.JSON(http.StatusOK, common.Error(500, "获取收货地址失败"))
		}
		return
	}

	c.JSON(http.StatusOK, common.Success(address))
}

// CreateAddress 创建收货地址
func (h *UserAddressHandler) CreateAddress(c *gin.Context) {
	currentUser, _ := c.Get("current_user")
	user := currentUser.(models.User)

	var address models.UserAddress
	if err := c.ShouldBindJSON(&address); err != nil {
		c.JSON(http.StatusOK, common.Error(400, "请求参数错误"))
		return
	}

	// 设置用户ID
	address.UserID = user.ID

	// 开启事务
	tx := common.GetDB().Begin()

	// 如果设置为默认地址，先取消其他地址的默认状态
	if address.IsDefault == 1 {
		if err := tx.Model(&models.UserAddress{}).Where("user_id = ?", user.ID).Update("is_default", 0).Error; err != nil {
			tx.Rollback()
			c.JSON(http.StatusOK, common.Error(500, "更新默认地址状态失败"))
			return
		}
	}

	// 创建地址
	if err := tx.Create(&address).Error; err != nil {
		tx.Rollback()
		c.JSON(http.StatusOK, common.Error(500, "创建收货地址失败"))
		return
	}

	tx.Commit()

	c.JSON(http.StatusOK, common.Success(address))
}

// UpdateAddress 更新收货地址
func (h *UserAddressHandler) UpdateAddress(c *gin.Context) {
	currentUser, _ := c.Get("current_user")
	user := currentUser.(models.User)

	addressID, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusOK, common.Error(400, "地址ID无效"))
		return
	}

	// 检查地址是否存在且属于当前用户
	var existAddress models.UserAddress
	err = common.GetDB().Where("id = ? AND user_id = ?", addressID, user.ID).First(&existAddress).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusOK, common.Error(404, "收货地址不存在"))
		} else {
			c.JSON(http.StatusOK, common.Error(500, "获取收货地址失败"))
		}
		return
	}

	var updateData models.UserAddress
	if err := c.ShouldBindJSON(&updateData); err != nil {
		c.JSON(http.StatusOK, common.Error(400, "请求参数错误"))
		return
	}

	// 开启事务
	tx := common.GetDB().Begin()

	// 如果设置为默认地址，先取消其他地址的默认状态
	if updateData.IsDefault == 1 {
		if err := tx.Model(&models.UserAddress{}).Where("user_id = ? AND id != ?", user.ID, addressID).Update("is_default", 0).Error; err != nil {
			tx.Rollback()
			c.JSON(http.StatusOK, common.Error(500, "更新默认地址状态失败"))
			return
		}
	}

	// 更新地址信息
	updateData.UserID = user.ID // 确保不会被修改
	if err := tx.Model(&existAddress).Updates(updateData).Error; err != nil {
		tx.Rollback()
		c.JSON(http.StatusOK, common.Error(500, "更新收货地址失败"))
		return
	}

	tx.Commit()

	// 返回更新后的地址
	var updatedAddress models.UserAddress
	common.GetDB().Where("id = ?", addressID).First(&updatedAddress)

	c.JSON(http.StatusOK, common.Success(updatedAddress))
}

// DeleteAddress 删除收货地址
func (h *UserAddressHandler) DeleteAddress(c *gin.Context) {
	currentUser, _ := c.Get("current_user")
	user := currentUser.(models.User)

	addressID, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusOK, common.Error(400, "地址ID无效"))
		return
	}

	// 检查地址是否存在且属于当前用户
	var address models.UserAddress
	err = common.GetDB().Where("id = ? AND user_id = ?", addressID, user.ID).First(&address).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusOK, common.Error(404, "收货地址不存在"))
		} else {
			c.JSON(http.StatusOK, common.Error(500, "获取收货地址失败"))
		}
		return
	}

	// 删除地址
	if err := common.GetDB().Delete(&address).Error; err != nil {
		c.JSON(http.StatusOK, common.Error(500, "删除收货地址失败"))
		return
	}

	c.JSON(http.StatusOK, common.Success(nil))
}

// SetDefaultAddress 设置默认收货地址
func (h *UserAddressHandler) SetDefaultAddress(c *gin.Context) {
	currentUser, _ := c.Get("current_user")
	user := currentUser.(models.User)

	addressID, err := strconv.ParseUint(c.Param("id"), 10, 32)
	if err != nil {
		c.JSON(http.StatusOK, common.Error(400, "地址ID无效"))
		return
	}

	// 检查地址是否存在且属于当前用户
	var address models.UserAddress
	err = common.GetDB().Where("id = ? AND user_id = ?", addressID, user.ID).First(&address).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			c.JSON(http.StatusOK, common.Error(404, "收货地址不存在"))
		} else {
			c.JSON(http.StatusOK, common.Error(500, "获取收货地址失败"))
		}
		return
	}

	// 开启事务
	tx := common.GetDB().Begin()

	// 取消其他地址的默认状态
	if err := tx.Model(&models.UserAddress{}).Where("user_id = ?", user.ID).Update("is_default", 0).Error; err != nil {
		tx.Rollback()
		c.JSON(http.StatusOK, common.Error(500, "更新默认地址状态失败"))
		return
	}

	// 设置当前地址为默认
	if err := tx.Model(&address).Update("is_default", 1).Error; err != nil {
		tx.Rollback()
		c.JSON(http.StatusOK, common.Error(500, "设置默认地址失败"))
		return
	}

	tx.Commit()

	c.JSON(http.StatusOK, common.Success(nil))
}