/*
 * Copyright (C) 2025 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.kotlin.compiler.cli

import java.io.File
import java.io.IOException

class CacheMarker(private val parentDir: File) {
    private val file: File?
        get() {
            if (!parentDir.exists() || !parentDir.isDirectory) {
                return null
            }

            return File(parentDir, ".cache-marker")
        }

    /** Creates the marker, returning true if it exists after execution. */
    fun write(): Boolean {
        try {
            return file?.createNewFile() ?: false
        } catch (e: IOException) {
            return false
        }
    }

    /** Returns true if the cache is valid. */
    fun isValid(): Boolean {
        return file?.exists() ?: false
    }

    /** Removes the marker, returning true if it is absent after execution. */
    fun remove(): Boolean {
        return file?.delete() ?: true
    }
}