package task

import (
	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/redis/redis_key"
	"code.gitea.io/gitea/modules/redis/redis_lock"
	"code.gitea.io/gitea/modules/util"
	"code.gitea.io/gitea/services/reward"
	"code.gitea.io/gitea/services/reward/limiter"
	"fmt"
	"time"
)

func Accomplish(userId int64, taskType string, sourceId string) {
	go accomplish(userId, taskType, sourceId)
}

func accomplish(userId int64, taskType string, sourceId string) error {
	defer func() {
		if err := recover(); err != nil {
			combinedErr := fmt.Errorf("%s\n%s", err, log.Stack(2))
			log.Error("PANIC:%v", combinedErr)
		}
	}()
	//lock
	var taskLock = redis_lock.NewDistributeLock(redis_key.TaskAccomplishLock(sourceId, taskType))
	isOk, err := taskLock.Lock(3 * time.Second)
	if err != nil {
		log.Error("get taskLock error. %v", err)
		return err
	}
	if !isOk {
		log.Info("duplicated task request,userId=%d taskType=%s sourceId=%s", userId, taskType, sourceId)
		return nil
	}
	defer taskLock.UnLock()

	//is handled before?
	isHandled, err := isHandled(taskType, sourceId)
	if err != nil {
		log.Error("Get isHandled error,%v", err)
		return err
	}
	if isHandled {
		log.Info("task has been handled,userId=%d taskType=%s sourceId=%s", userId, taskType, sourceId)
		return nil
	}

	//get task config
	config, err := GetTaskConfig(taskType)
	if err != nil {
		log.Error("GetTaskConfig error,%v", err)
		return err
	}
	if config == nil {
		log.Info("task config not exist,userId=%d taskType=%s sourceId=%s", userId, taskType, sourceId)
		return nil
	}

	//is limited?
	if isLimited(userId, config) {
		log.Info("task accomplish maximum times are reached,userId=%d taskType=%s sourceId=%s", userId, taskType, sourceId)
		return nil
	}

	//add log
	logId := util.UUID()
	_, err = models.InsertTaskAccomplishLog(&models.TaskAccomplishLog{
		LogId:    logId,
		ConfigId: config.ID,
		TaskCode: config.TaskCode,
		UserId:   userId,
		SourceId: sourceId,
	})
	if err != nil {
		return err
	}

	//reward
	reward.Send(models.RewardOperateContext{
		SourceType: models.SourceTypeAccomplishTask,
		SourceId:   logId,
		Reward: models.Reward{
			Amount: config.AwardAmount,
			Type:   config.AwardType,
		},
		TargetUserId: userId,
		RequestId:    logId,
		OperateType:  models.OperateTypeIncrease,
	})

	return nil
}

func isHandled(taskType string, sourceId string) (bool, error) {
	_, err := models.GetTaskAccomplishLogBySourceIdAndTaskCode(sourceId, taskType)
	if err != nil {
		if models.IsErrRecordNotExist(err) {
			return false, nil
		}
		return false, err
	}
	return true, nil

}

func isLimited(userId int64, config *models.TaskConfig) bool {
	if err := limiter.CheckLimit(config.TaskCode, models.LimitTypeTask, userId, 1); err != nil {
		return true
	}
	return false

}