package controller

import (
	"net/http"
	"time"

	"ezops/model"

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

// SessionCommandHandler 会话命令审计处理器 // Logan.Li
type SessionCommandHandler struct {
	db *gorm.DB
}

// NewSessionCommandHandler 创建会话命令审计处理器
func NewSessionCommandHandler(db *gorm.DB) *SessionCommandHandler {
	return &SessionCommandHandler{db: db}
}

// ListSessionCommands 会话命令列表
// GET /api/v1/session-commands?session_id=&username=&page=&page_size=
func (h *SessionCommandHandler) ListSessionCommands(c *gin.Context) {
	var req model.SessionCommandQuery
	if err := c.ShouldBindQuery(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Response{Code: 400, Message: err.Error()})
		return
	}
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 {
		req.PageSize = 20
	}

	query := h.db.Model(&model.SessionCommand{})
	if req.SessionID > 0 {
		query = query.Where("session_id = ?", req.SessionID)
	}
	if req.Username != "" {
		query = query.Where("username LIKE ?", "%"+req.Username+"%")
	}
	if req.ServerID > 0 {
		query = query.Where("server_id = ?", req.ServerID)
	}
	if req.Command != "" {
		query = query.Where("command LIKE ?", "%"+req.Command+"%")
	}
	if req.StartDate != "" {
		if t, err := time.ParseInLocation("2006-01-02", req.StartDate, time.Local); err == nil {
			query = query.Where("timestamp >= ?", t)
		}
	}
	if req.EndDate != "" {
		if t, err := time.ParseInLocation("2006-01-02", req.EndDate, time.Local); err == nil {
			query = query.Where("timestamp < ?", t.Add(24*time.Hour))
		}
	}

	var total int64
	if err := query.Count(&total).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "查询失败"})
		return
	}

	// 联表带出会话录制大小，前端可判断能否回放 // Logan.Li
	var items []model.SessionCommandItem
	listQuery := h.db.Table("sys_session_commands AS sc").
		Select("sc.*, COALESCE(ts.record_size, rs.record_size, 0) AS session_record_size").
		Joins("LEFT JOIN sys_terminal_sessions AS ts ON ts.id = sc.session_id AND COALESCE(sc.session_type, 'terminal') = 'terminal'").
		Joins("LEFT JOIN sys_rdp_sessions AS rs ON rs.id = sc.session_id AND sc.session_type = 'rdp'")
	if req.SessionID > 0 {
		listQuery = listQuery.Where("sc.session_id = ?", req.SessionID)
	}
	if req.Username != "" {
		listQuery = listQuery.Where("sc.username LIKE ?", "%"+req.Username+"%")
	}
	if req.ServerID > 0 {
		listQuery = listQuery.Where("sc.server_id = ?", req.ServerID)
	}
	if req.Command != "" {
		listQuery = listQuery.Where("sc.command LIKE ?", "%"+req.Command+"%")
	}
	if req.StartDate != "" {
		if t, err := time.ParseInLocation("2006-01-02", req.StartDate, time.Local); err == nil {
			listQuery = listQuery.Where("sc.timestamp >= ?", t)
		}
	}
	if req.EndDate != "" {
		if t, err := time.ParseInLocation("2006-01-02", req.EndDate, time.Local); err == nil {
			listQuery = listQuery.Where("sc.timestamp < ?", t.Add(24*time.Hour))
		}
	}
	if err := listQuery.Order("sc.id DESC").
		Offset((req.Page - 1) * req.PageSize).
		Limit(req.PageSize).
		Scan(&items).Error; err != nil {
		c.JSON(http.StatusInternalServerError, model.Response{Code: 500, Message: "查询失败"})
		return
	}

	c.JSON(http.StatusOK, model.Response{Code: 200, Data: model.ListResponse{
		List:  items,
		Total: total,
	}})
}