package controller

import (
	"net/http"

	"ezops/middleware"
	"ezops/model"

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

// GetChatHistory 获取当前用户的对话历史（按 session_id 过滤，默认返回最新 session） // Logan.Li
// GET /api/v1/aiops/chat-history?session_id=xxx
func (h *LLMHandler) GetChatHistory(c *gin.Context) {
	uid := middleware.GetUserID(c)
	sid := c.Query("session_id")
	var rows []model.ChatHistory
	q := h.db.Where("user_id = ?", uid)
	// 指定 session_id 直接过滤；未指定则查最新 session // Logan.Li
	if sid != "" {
		q = q.Where("session_id = ?", sid)
	} else {
		// 取该用户最新的 session_id（id 最大那条的 session_id）
		var latest model.ChatHistory
		if err := h.db.Where("user_id = ?", uid).Order("id DESC").First(&latest).Error; err == nil && latest.SessionID != "" {
			q = q.Where("session_id = ?", latest.SessionID)
		}
	}
	q.Order("id DESC").Limit(100).Find(&rows)
	// 反转为时间正序（最早在前）
	for i, j := 0, len(rows)-1; i < j; i, j = i+1, j-1 {
		rows[i], rows[j] = rows[j], rows[i]
	}
	c.JSON(http.StatusOK, model.Response{Code: 200, Data: gin.H{
		"list":  rows,
		"total": len(rows),
	}})
}

// ClearChatHistory 清空当前用户的对话历史 // Logan.Li
// DELETE /api/v1/aiops/chat-history
func (h *LLMHandler) ClearChatHistory(c *gin.Context) {
	uid := middleware.GetUserID(c)
	if err := h.db.Where("user_id = ?", uid).Delete(&model.ChatHistory{}).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "清除失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, model.Response{Code: 200, Message: "对话历史已清空"})
}