package cloudbrain

import (
	"io/ioutil"
	"os"
	"sort"
	"time"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/storage"
)

func ClearCloudbrainResultSpace() {
	log.Info("clear cloudbrain one result space begin.")
	if !setting.ClearStrategy.Enabled {
		return
	}

	tasks, err := models.GetGPUStoppedNotDebugJobDaysAgo(setting.ClearStrategy.ResultSaveDays, setting.ClearStrategy.BatchSize)
	if err != nil {
		log.Warn("Failed to get cloudbrain, clear result failed.", err)
		return
	}
	debugTasks, err := models.GetGPUStoppedDebugJobDaysAgo(setting.ClearStrategy.ResultSaveDays, setting.ClearStrategy.DebugJobSize)
	if err != nil {
		log.Warn("Failed to get debug cloudbrain.", err)

	}
	tasks = append(tasks, debugTasks...)

	if err != nil {
		log.Warn("Failed to get cloudbrain, clear result failed.", err)
		return
	}
	var ids []int64
	for _, task := range tasks {
		err := DeleteCloudbrainOneJobStorage(task.JobName)
		if err == nil {
			log.Info("clear job in cloudbrain table:" + task.JobName)
			ids = append(ids, task.ID)
		}
	}

	err = models.UpdateCloudBrainRecordsCleared(ids)
	if err != nil {
		log.Warn("Failed to set cloudbrain cleared status", err)
	}
	//如果云脑表处理完了，通过遍历minio对象处理历史垃圾数据，如果存在的话
	if len(tasks) < setting.ClearStrategy.BatchSize+setting.ClearStrategy.DebugJobSize {
		clearLocalHistoryTrashFile()
		clearMinioHistoryTrashFile()

	}
	log.Info("clear cloudbrain one result space end.")

}

func clearMinioHistoryTrashFile() {
	JobRealPrefix := setting.Attachment.Minio.RealPath + setting.Attachment.Minio.Bucket + "/" + setting.CBCodePathPrefix

	miniofiles, err := ioutil.ReadDir(JobRealPrefix)

	processCount := 0
	if err != nil {
		log.Warn("Can not browser minio job path.")
	} else {
		SortModTimeAscend(miniofiles)
		for _, file := range miniofiles {

			if file.Name() != "" && file.ModTime().Before(time.Now().AddDate(0, 0, -setting.ClearStrategy.TrashSaveDays)) {

				has, err := models.IsCloudbrainExistByJobName(file.Name())
				if err == nil && !has {
					dirPath := setting.CBCodePathPrefix + file.Name() + "/"
					log.Info("clear job in minio trash:" + file.Name())
					storage.Attachments.DeleteDir(dirPath)
					processCount++
				}
				if processCount == setting.ClearStrategy.BatchSize {
					break
				}
			} else {
				break
			}

		}

	}
}

func clearLocalHistoryTrashFile() {
	files, err := ioutil.ReadDir(setting.JobPath)
	processCount := 0
	if err != nil {
		log.Warn("Can not browser local job path.")
	} else {
		SortModTimeAscend(files)
		for _, file := range files {
			//清理n天前的历史垃圾数据，清理job目录
			if file.Name() != "" && file.ModTime().Before(time.Now().AddDate(0, 0, -setting.ClearStrategy.TrashSaveDays)) {
				has, err := models.IsCloudbrainExistByJobName(file.Name())
				if err == nil && !has {
					os.RemoveAll(setting.JobPath + file.Name())
					log.Info("clear job in local trash:" + file.Name())
					processCount++
				}
				if processCount == setting.ClearStrategy.BatchSize {
					break
				}
			} else {
				break
			}

		}

	}

}

func SortModTimeAscend(files []os.FileInfo) {
	sort.Slice(files, func(i, j int) bool {
		return files[i].ModTime().Before(files[j].ModTime())
	})
}

func DeleteCloudbrainOneJobStorage(jobName string) error {

	if jobName == "" {
		return nil
	}
	//delete local
	localJobPath := setting.JobPath + jobName
	err := os.RemoveAll(localJobPath)
	if err != nil {
		log.Error("RemoveAll(%s) failed:%v", localJobPath, err)
	}

	dirPath := setting.CBCodePathPrefix + jobName + "/"
	err1 := storage.Attachments.DeleteDir(dirPath)

	if err1 != nil {
		log.Error("DeleteDir(%s) failed:%v", localJobPath, err)
	}
	if err == nil {
		err = err1
	}

	return err
}