package com.guo.learningprogresstracker.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.guo.learningprogresstracker.enums.StudySessionStateEnum;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;

import java.io.Serializable;
import java.time.Duration;
import java.time.LocalDateTime;

/**
 * 记录每次学习会话的具体数据
 * @TableName study_sessions
 */
@TableName(value ="study_sessions")
@Slf4j
@Data
public class StudySessionsEntity extends BaseEntity implements Serializable {

    @TableId(type = IdType.AUTO)
    private Integer id;

    @TableField(value = "session_num")
    private String sessionNum;

    /**
     * 
     */
    @TableField(value = "task_num")
    private String taskNum;

    /**
     * 学习开始时间
     */
    @TableField(value = "start_time")
    private LocalDateTime startTime;

    @TableField(value = "last_start_time")
    private LocalDateTime lastStartTime;

    /**
     * 学习结束时间
     */
    @TableField(value = "end_time")
    private LocalDateTime endTime;

    /**
     * 实际使用时间（分钟）
     */
    @TableField(value = "actual_time")
    private Integer actualTime;

    /**
     * 有效学习时间（分钟）
     */
    @TableField(value = "effective_time")
    private Integer effectiveTime;

    /**
     * 有效时间比
     */
    @TableField(value = "effectiveness_ratio")
    private Double effectivenessRatio;

    /**
     * 学习会话的状态（进行中、暂停、已结束）
     */
    @TableField(value = "session_state")
    private String sessionState;


    @TableField(exist = false)
    private static final long serialVersionUID = 1L;

    /**
     * 初始化新会话
     * @return
     */
    public static StudySessionsEntity initNewSession(){
        StudySessionsEntity studySessionsEntity = new StudySessionsEntity();
        studySessionsEntity.setStartTime(LocalDateTime.now());
        studySessionsEntity.setLastModifiedTime(LocalDateTime.now());
        studySessionsEntity.setSessionState(StudySessionStateEnum.ONGOING.name());
        return studySessionsEntity;
    }

    /**
     * 继续会话
     */
    public void continueStudySession(){
        if (this.getSessionState().equals(StudySessionStateEnum.PAUSED.name())){
            this.setSessionState(StudySessionStateEnum.ONGOING.name());
            this.setLastStartTime(LocalDateTime.now());
        }else{
            log.warn("不应出现的情况：开始了一个状态为【{}】的学习会话",this.getSessionState());
        }
    }

    /**
     * 暂停会话
     */
    public void pausedStudySession(){
        if (this.getSessionState().equals(StudySessionStateEnum.PAUSED.name())){
            //
        }else {
            this.setEndTime(LocalDateTime.now());
            this.setEffectiveTime((int) Duration.between(this.lastStartTime,this.endTime).toMinutes());
            this.setActualTime((int) Duration.between(this.endTime,this.startTime).toMinutes());
            this.setSessionState(StudySessionStateEnum.PAUSED.name());
        }
    }
}