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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package git

import (
	"crypto/sha256"
	"fmt"

	"code.gitea.io/gitea/modules/log"
)

// Cache represents a caching interface
type Cache interface {
	// Put puts value into cache with key and expire time.
	Put(key string, val interface{}, timeout int64) error
	// Get gets cached value by given key.
	Get(key string) interface{}
}

func (c *LastCommitCache) getCacheKey(repoPath, ref, entryPath string) string {
	hashBytes := sha256.Sum256([]byte(fmt.Sprintf("%s:%s:%s", repoPath, ref, entryPath)))
	return fmt.Sprintf("last_commit:%x", hashBytes)
}

// Put put the last commit id with commit and entry path
func (c *LastCommitCache) Put(ref, entryPath, commitID string) error {
	if c == nil || c.cache == nil {
		return nil
	}
	log.Debug("LastCommitCache save: [%s:%s:%s]", ref, entryPath, commitID)
	return c.cache.Put(c.getCacheKey(c.repoPath, ref, entryPath), commitID, c.ttl())
}