package handler

import (
	"strconv"

	"with_you/internal/dto"
	"with_you/internal/pkg/response"
	"with_you/internal/service"

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

// AdminGroupHandler 管理端群组处理器
type AdminGroupHandler struct {
	adminGroupService service.AdminGroupService
}

// NewAdminGroupHandler 创建管理端群组处理器
func NewAdminGroupHandler(adminGroupService service.AdminGroupService) *AdminGroupHandler {
	return &AdminGroupHandler{
		adminGroupService: adminGroupService,
	}
}

// GetGroupList 获取群组列表
// GET /api/v1/admin/groups
func (h *AdminGroupHandler) GetGroupList(c *gin.Context) {
	// 解析分页参数
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	if page <= 0 {
		page = 1
	}
	if pageSize <= 0 || pageSize > 100 {
		pageSize = 20
	}

	// 获取筛选参数
	keyword := c.Query("keyword")
	status := c.Query("status")
	ownerID := c.Query("owner_id")
	startDate := c.Query("start_date")
	endDate := c.Query("end_date")

	groups, total, err := h.adminGroupService.GetGroupList(c.Request.Context(), page, pageSize, keyword, status, ownerID, startDate, endDate)
	if err != nil {
		response.InternalServerError(c, "failed to get group list")
		return
	}

	response.Paginated(c, groups, total, page, pageSize)
}

// GetGroupDetail 获取群组详情
// GET /api/v1/admin/groups/:id
func (h *AdminGroupHandler) GetGroupDetail(c *gin.Context) {
	groupID := c.Param("id")
	if groupID == "" {
		response.BadRequest(c, "group id is required")
		return
	}

	groupDetail, err := h.adminGroupService.GetGroupDetail(c.Request.Context(), groupID)
	if err != nil {
		response.NotFound(c, "group not found")
		return
	}

	response.Success(c, groupDetail)
}

// GetGroupMembers 获取群组成员列表
// GET /api/v1/admin/groups/:id/members
func (h *AdminGroupHandler) GetGroupMembers(c *gin.Context) {
	groupID := c.Param("id")
	if groupID == "" {
		response.BadRequest(c, "group id is required")
		return
	}

	// 解析分页参数
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	if page <= 0 {
		page = 1
	}
	if pageSize <= 0 || pageSize > 100 {
		pageSize = 20
	}

	members, err := h.adminGroupService.GetGroupMembers(c.Request.Context(), groupID, page, pageSize)
	if err != nil {
		response.HandleError(c, err, "failed to get group members")
		return
	}

	response.Success(c, members)
}

// DeleteGroup 解散群组
// DELETE /api/v1/admin/groups/:id
func (h *AdminGroupHandler) DeleteGroup(c *gin.Context) {
	groupID := c.Param("id")
	if groupID == "" {
		response.BadRequest(c, "group id is required")
		return
	}

	err := h.adminGroupService.DeleteGroup(c.Request.Context(), groupID)
	if err != nil {
		response.HandleError(c, err, "failed to delete group")
		return
	}

	response.Success(c, dto.SuccessResponse{
		Success: true,
		Message: "group deleted successfully",
	})
}

// UpdateGroupStatus 更新群组状态
// PUT /api/v1/admin/groups/:id/status
func (h *AdminGroupHandler) UpdateGroupStatus(c *gin.Context) {
	groupID := c.Param("id")
	if groupID == "" {
		response.BadRequest(c, "group id is required")
		return
	}

	var req dto.AdminUpdateGroupStatusRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	// 验证状态值
	if req.Status != "active" && req.Status != "dissolved" {
		response.BadRequest(c, "invalid status value, must be 'active' or 'dissolved'")
		return
	}

	groupDetail, err := h.adminGroupService.UpdateGroupStatus(c.Request.Context(), groupID, req.Status)
	if err != nil {
		response.HandleError(c, err, "failed to update group status")
		return
	}

	response.Success(c, groupDetail)
}

// RemoveMember 移除群组成员
// DELETE /api/v1/admin/groups/:id/members/:userId
func (h *AdminGroupHandler) RemoveMember(c *gin.Context) {
	groupID := c.Param("id")
	userID := c.Param("userId")

	if groupID == "" {
		response.BadRequest(c, "group id is required")
		return
	}
	if userID == "" {
		response.BadRequest(c, "user id is required")
		return
	}

	err := h.adminGroupService.RemoveMember(c.Request.Context(), groupID, userID)
	if err != nil {
		response.HandleError(c, err, "failed to remove member")
		return
	}

	response.Success(c, dto.SuccessResponse{
		Success: true,
		Message: "member removed successfully",
	})
}

// TransferOwner 转让群主
// PUT /api/v1/admin/groups/:id/transfer
func (h *AdminGroupHandler) TransferOwner(c *gin.Context) {
	groupID := c.Param("id")
	if groupID == "" {
		response.BadRequest(c, "group id is required")
		return
	}

	var req dto.AdminTransferGroupOwnerRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "invalid request body: "+err.Error())
		return
	}

	groupDetail, err := h.adminGroupService.TransferOwner(c.Request.Context(), groupID, req.NewOwnerID)
	if err != nil {
		response.HandleError(c, err, "failed to transfer owner")
		return
	}

	response.Success(c, groupDetail)
}