/*
 * Copyright (c) 2023 New Vector Ltd
 *
 * 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 io.element.android.libraries.mediaviewer.api.util

import android.webkit.MimeTypeMap
import com.squareup.anvil.annotations.ContributesBinding
import io.element.android.libraries.di.AppScope
import javax.inject.Inject

interface FileExtensionExtractor {
    fun extractFromName(name: String): String
}

@ContributesBinding(AppScope::class)
class FileExtensionExtractorWithValidation @Inject constructor() : FileExtensionExtractor {
    override fun extractFromName(name: String): String {
        val fileExtension = name.substringAfterLast('.', "")
        // Makes sure the extension is known by the system, otherwise default to binary extension.
        return if (MimeTypeMap.getSingleton().hasExtension(fileExtension)) {
            fileExtension
        } else {
            "bin"
        }
    }
}

class FileExtensionExtractorWithoutValidation : FileExtensionExtractor {
    override fun extractFromName(name: String): String {
        return name.substringAfterLast('.', "")
    }
}
