package handlers

import (
	"net/http"
	"regexp"
	"strconv"
	"strings"

	"goalfymax-admin/internal/config"
	"goalfymax-admin/internal/models"
	"goalfymax-admin/internal/services"

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

type InviteCodeHandler struct {
	service          services.InviteCodeService
	userLevelService services.UserLevelConfigService
}

func NewInviteCodeHandler(service services.InviteCodeService, userLevelService services.UserLevelConfigService) *InviteCodeHandler {
	return &InviteCodeHandler{
		service:          service,
		userLevelService: userLevelService,
	}
}

// GetInviteCodeList 获取邀请码列表
func (h *InviteCodeHandler) GetInviteCodeList(c *gin.Context) {
	var req models.InviteCodeListRequest
	if err := c.ShouldBindQuery(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "参数错误",
			"data":    nil,
		})
		return
	}

	// 设置默认分页参数
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.Size <= 0 {
		req.Size = 20
	}

	response, err := h.service.List(&req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"code":    500,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	// enrich invite_url
	base := config.GetConfig().SSO.SSOServerURL
	base = strings.TrimRight(base, "/")
	enriched := make([]gin.H, 0, len(response.List))
	for _, item := range response.List {
		// 获取用户等级信息
		var userLevelName string
		if item.UserLevelID != nil {
			if level, err := h.userLevelService.GetByID(*item.UserLevelID); err == nil {
				userLevelName = level.LevelName
			}
		}

		enriched = append(enriched, gin.H{
			"id":              item.ID,
			"code":            item.Code,
			"is_used":         item.IsUsed,
			"client_id":       item.ClientID,
			"client_label":    config.GetClientValue(item.ClientID),
			"email":           item.Email,
			"user_level_id":   item.UserLevelID,
			"user_level_name": userLevelName,
			"expires_at":      item.ExpiresAt,
			"created_at":      item.CreatedAt,
			"invite_url":      base + "/invite/" + item.Code,
		})
	}
	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "获取成功",
		"data": gin.H{
			"list":  enriched,
			"total": response.Total,
		},
	})
}

// GetInviteCodeDetail 获取邀请码详情
func (h *InviteCodeHandler) GetInviteCodeDetail(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "ID格式错误",
			"data":    nil,
		})
		return
	}

	inviteCode, err := h.service.GetByID(uint(id))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{
			"code":    404,
			"message": "邀请码不存在",
			"data":    nil,
		})
		return
	}

	base := config.GetConfig().SSO.SSOServerURL
	base = strings.TrimRight(base, "/")

	// 获取用户等级信息
	var userLevelName string
	if inviteCode.UserLevelID != nil {
		if level, err := h.userLevelService.GetByID(*inviteCode.UserLevelID); err == nil {
			userLevelName = level.LevelName
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "获取成功",
		"data": gin.H{
			"id":              inviteCode.ID,
			"code":            inviteCode.Code,
			"is_used":         inviteCode.IsUsed,
			"client_id":       inviteCode.ClientID,
			"client_label":    config.GetClientValue(inviteCode.ClientID),
			"email":           inviteCode.Email,
			"user_level_id":   inviteCode.UserLevelID,
			"user_level_name": userLevelName,
			"expires_at":      inviteCode.ExpiresAt,
			"created_at":      inviteCode.CreatedAt,
			"invite_url":      base + "/invite/" + inviteCode.Code,
		},
	})
}

// validateEmail 验证邮箱格式
func validateEmail(email string) bool {
	emailRegex := regexp.MustCompile(`^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$`)
	return emailRegex.MatchString(email)
}

// CreateInviteCode 创建邀请码（支持设置过期时间和邮箱列表）
func (h *InviteCodeHandler) CreateInviteCode(c *gin.Context) {
	var req models.InviteCodeCreateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "参数错误：" + err.Error(),
			"data":    nil,
		})
		return
	}

	// 验证邮箱格式
	if len(req.Emails) > 0 {
		for _, email := range req.Emails {
			if email != "" && !validateEmail(email) {
				c.JSON(http.StatusBadRequest, gin.H{
					"code":    400,
					"message": "邮箱格式不正确: " + email,
					"data":    nil,
				})
				return
			}
		}
	}

	// 验证用户等级ID是否存在且启用
	if req.UserLevelID != nil {
		userLevel, err := h.userLevelService.GetByID(*req.UserLevelID)
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{
				"code":    400,
				"message": "用户等级不存在",
				"data":    nil,
			})
			return
		}
		if userLevel.Status != 1 {
			c.JSON(http.StatusBadRequest, gin.H{
				"code":    400,
				"message": "用户等级已禁用",
				"data":    nil,
			})
			return
		}
	}

	inviteCodes, err := h.service.Create(&req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"code":    500,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	base := config.GetConfig().SSO.SSOServerURL
	base = strings.TrimRight(base, "/")

	// 如果只创建了一个邀请码，返回单个对象（向后兼容）
	if len(inviteCodes) == 1 {
		inviteCode := inviteCodes[0]
		var userLevelName string
		if inviteCode.UserLevelID != nil {
			if level, err := h.userLevelService.GetByID(*inviteCode.UserLevelID); err == nil {
				userLevelName = level.LevelName
			}
		}

		c.JSON(http.StatusOK, gin.H{
			"code":    200,
			"message": "创建成功",
			"data": gin.H{
				"id":              inviteCode.ID,
				"code":            inviteCode.Code,
				"is_used":         inviteCode.IsUsed,
				"client_id":       inviteCode.ClientID,
				"client_label":    config.GetClientValue(inviteCode.ClientID),
				"email":           inviteCode.Email,
				"user_level_id":   inviteCode.UserLevelID,
				"user_level_name": userLevelName,
				"expires_at":      inviteCode.ExpiresAt,
				"created_at":      inviteCode.CreatedAt,
				"invite_url":      base + "/invite/" + inviteCode.Code,
			},
		})
		return
	}

	// 如果创建了多个邀请码，返回数组
	enriched := make([]gin.H, 0, len(inviteCodes))
	for _, inviteCode := range inviteCodes {
		var userLevelName string
		if inviteCode.UserLevelID != nil {
			if level, err := h.userLevelService.GetByID(*inviteCode.UserLevelID); err == nil {
				userLevelName = level.LevelName
			}
		}

		enriched = append(enriched, gin.H{
			"id":              inviteCode.ID,
			"code":            inviteCode.Code,
			"is_used":         inviteCode.IsUsed,
			"client_id":       inviteCode.ClientID,
			"client_label":    config.GetClientValue(inviteCode.ClientID),
			"email":           inviteCode.Email,
			"user_level_id":   inviteCode.UserLevelID,
			"user_level_name": userLevelName,
			"expires_at":      inviteCode.ExpiresAt,
			"created_at":      inviteCode.CreatedAt,
			"invite_url":      base + "/invite/" + inviteCode.Code,
		})
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "创建成功",
		"data":    enriched,
	})
}

// UpdateInviteCode 更新邀请码（支持更新过期时间）
func (h *InviteCodeHandler) UpdateInviteCode(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "ID格式错误",
			"data":    nil,
		})
		return
	}

	var req models.InviteCodeUpdateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "参数错误",
			"data":    nil,
		})
		return
	}

	inviteCode, err := h.service.Update(uint(id), &req)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	base := config.GetConfig().SSO.SSOServerURL
	base = strings.TrimRight(base, "/")

	// 获取用户等级信息
	var userLevelName string
	if inviteCode.UserLevelID != nil {
		if level, err := h.userLevelService.GetByID(*inviteCode.UserLevelID); err == nil {
			userLevelName = level.LevelName
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "更新成功",
		"data": gin.H{
			"id":              inviteCode.ID,
			"code":            inviteCode.Code,
			"is_used":         inviteCode.IsUsed,
			"client_id":       inviteCode.ClientID,
			"client_label":    config.GetClientValue(inviteCode.ClientID),
			"email":           inviteCode.Email,
			"user_level_id":   inviteCode.UserLevelID,
			"user_level_name": userLevelName,
			"expires_at":      inviteCode.ExpiresAt,
			"created_at":      inviteCode.CreatedAt,
			"invite_url":      base + "/invite/" + inviteCode.Code,
		},
	})
}

// DeleteInviteCode 删除邀请码
func (h *InviteCodeHandler) DeleteInviteCode(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 32)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "ID格式错误",
			"data":    nil,
		})
		return
	}

	err = h.service.Delete(uint(id))
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"code":    500,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "删除成功",
		"data":    nil,
	})
}

// GetInviteCodeStatistics 获取统计信息
func (h *InviteCodeHandler) GetInviteCodeStatistics(c *gin.Context) {
	stats, err := h.service.GetStatistics()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"code":    500,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "获取成功",
		"data":    stats,
	})
}

// MarkInviteCodeAsUsed 标记邀请码为已使用
func (h *InviteCodeHandler) MarkInviteCodeAsUsed(c *gin.Context) {
	var req struct {
		Code string `json:"code" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "参数错误",
			"data":    nil,
		})
		return
	}

	err := h.service.MarkAsUsed(req.Code)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "标记成功",
		"data":    nil,
	})
}

// ValidateInviteCode 验证邀请码是否有效
func (h *InviteCodeHandler) ValidateInviteCode(c *gin.Context) {
	var req struct {
		Code string `json:"code" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": "参数错误",
			"data":    nil,
		})
		return
	}

	err := h.service.ValidateInviteCode(req.Code)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{
			"code":    400,
			"message": err.Error(),
			"data":    nil,
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "邀请码有效",
		"data":    nil,
	})
}

// GetClientOptions 获取客户端选项列表
func (h *InviteCodeHandler) GetClientOptions(c *gin.Context) {
	options := config.GetClientOptions()
	c.JSON(http.StatusOK, gin.H{
		"code":    200,
		"message": "获取成功",
		"data":    options,
	})
}