// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package actions

import (
	"context"
	"fmt"
	"time"

	actions_model "code.gitea.io/gitea/models/actions"
	"code.gitea.io/gitea/models/db"
	"code.gitea.io/gitea/modules/actions"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/timeutil"
)

const (
	zombieTaskTimeout   = 10 * time.Minute
	endlessTaskTimeout  = 3 * time.Hour
	abandonedJobTimeout = 24 * time.Hour
)

// StopZombieTasks stops the task which have running status, but haven't been updated for a long time
func StopZombieTasks(ctx context.Context) error {
	return stopTasks(ctx, actions_model.FindTaskOptions{
		Status:        actions_model.StatusRunning,
		UpdatedBefore: timeutil.TimeStamp(time.Now().Add(-zombieTaskTimeout).Unix()),
	})
}

// StopEndlessTasks stops the tasks which have running status and continuous updates, but don't end for a long time
func StopEndlessTasks(ctx context.Context) error {
	return stopTasks(ctx, actions_model.FindTaskOptions{
		Status:        actions_model.StatusRunning,
		StartedBefore: timeutil.TimeStamp(time.Now().Add(-endlessTaskTimeout).Unix()),
	})
}

func stopTasks(ctx context.Context, opts actions_model.FindTaskOptions) error {
	tasks, err := actions_model.FindTasks(ctx, opts)
	if err != nil {
		return fmt.Errorf("find tasks: %w", err)
	}

	jobs := make([]*actions_model.ActionRunJob, 0, len(tasks))
	for _, task := range tasks {
		if err := db.WithTx(ctx, func(ctx context.Context) error {
			if err := actions_model.StopTask(ctx, task.ID, actions_model.StatusFailure); err != nil {
				return err
			}
			if err := task.LoadJob(ctx); err != nil {
				return err
			}
			jobs = append(jobs, task.Job)
			return nil
		}); err != nil {
			log.Warn("Cannot stop task %v: %v", task.ID, err)
			// go on
		} else if remove, err := actions.TransferLogs(ctx, task.LogFilename); err != nil {
			log.Warn("Cannot transfer logs of task %v: %v", task.ID, err)
		} else {
			remove()
		}
	}

	for _, job := range jobs {
		if err := CreateCommitStatus(ctx, job); err != nil {
			log.Error("Update commit status for job %v failed: %v", job.ID, err)
			// go on
		}
	}

	return nil
}

// CancelAbandonedJobs cancels the jobs which have waiting status, but haven't been picked by a runner for a long time
func CancelAbandonedJobs(ctx context.Context) error {
	jobs, _, err := actions_model.FindRunJobs(ctx, actions_model.FindRunJobOptions{
		Statuses:      []actions_model.Status{actions_model.StatusWaiting, actions_model.StatusBlocked},
		UpdatedBefore: timeutil.TimeStamp(time.Now().Add(-abandonedJobTimeout).Unix()),
	})
	if err != nil {
		log.Warn("find abandoned tasks: %v", err)
		return err
	}

	now := timeutil.TimeStampNow()
	for _, job := range jobs {
		job.Status = actions_model.StatusCancelled
		job.Stopped = now
		if err := db.WithTx(ctx, func(ctx context.Context) error {
			_, err := actions_model.UpdateRunJob(ctx, job, nil, "status", "stopped")
			return err
		}); err != nil {
			log.Warn("cancel abandoned job %v: %v", job.ID, err)
			// go on
		}
		if err := CreateCommitStatus(ctx, job); err != nil {
			log.Error("Update commit status for job %v failed: %v", job.ID, err)
			// go on
		}
	}

	return nil
}