/**
 * package api
 * 作用：会话列表（最近聊天）相关 API 处理器
 */
package api

import (
	"xk-websocket-v2/internal/service"
	"xk-websocket-v2/internal/utils"

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

/**
 * GetConversationListHandler
 * 功能：获取当前用户的会话列表
 * 路径：GET /api/conversations
 */
func GetConversationListHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")

	list, err := service.ConversationSvc.GetConversations(userID.(string))
	if err != nil {
		utils.InternalError(c, "查询失败")
		return
	}

	utils.SuccessWithData(c, list, "获取成功")
}

/**
 * ResetConversationUnreadHandler
 * 功能：重置会话未读数
 * 路径：POST /api/conversations/reset-unread
 */
func ResetConversationUnreadHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")

	var req struct {
		TargetID string `json:"target_id" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		utils.BadRequest(c, "参数错误")
		return
	}

	if err := service.ConversationSvc.ResetUnread(userID.(string), req.TargetID); err != nil {
		utils.InternalError(c, "操作失败")
		return
	}

	utils.Success(c, "已重置未读")
}

/**
 * UpdateConversationHandler
 * 功能：更新会话标记（置顶、免打扰、特别关心）
 * 路径：POST /api/conversations/update
 */
func UpdateConversationHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")

	var req struct {
		TargetID      string `json:"target_id" binding:"required"`
		IsTop         *bool  `json:"is_top"`
		IsMuted       *bool  `json:"is_muted"`
		IsSpecialCare *bool  `json:"is_special_care"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		utils.BadRequest(c, "参数错误")
		return
	}

	updates := make(map[string]interface{})
	if req.IsTop != nil {
		updates["is_top"] = *req.IsTop
	}
	if req.IsMuted != nil {
		updates["is_muted"] = *req.IsMuted
	}
	if req.IsSpecialCare != nil {
		updates["is_special_care"] = *req.IsSpecialCare
	}

	if len(updates) == 0 {
		utils.BadRequest(c, "没有可更新的字段")
		return
	}

	if err := service.ConversationSvc.UpdateConversationFlags(userID.(string), req.TargetID, updates); err != nil {
		utils.InternalError(c, "更新失败")
		return
	}

	utils.Success(c, "更新成功")
}

/**
 * DeleteConversationHandler
 * 功能：删除会话
 * 路径：POST /api/conversations/delete
 */
func DeleteConversationHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")

	var req struct {
		TargetID string `json:"target_id" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		utils.BadRequest(c, "参数错误")
		return
	}

	if err := service.ConversationSvc.DeleteConversation(userID.(string), req.TargetID); err != nil {
		utils.InternalError(c, "删除失败")
		return
	}

	utils.Success(c, "删除成功")
}

/**
 * GetConversationByRoomHandler
 * 功能：根据 room_id 获取会话（不自动创建）
 * 路径：GET /api/conversations/by-room/:room_id
 */
func GetConversationByRoomHandler(c *gin.Context) {
	userID, _ := c.Get("user_id")
	roomID := c.Param("room_id")

	if roomID == "" {
		utils.BadRequest(c, "room_id 不能为空")
		return
	}

	conv, err := service.ConversationSvc.GetOrCreateConversationByRoom(userID.(string), roomID)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			utils.NotFound(c, "会话不存在")
		} else {
			utils.InternalError(c, "查询失败")
		}
		return
	}

	utils.SuccessWithData(c, conv, "获取成功")
}