/*
 * Copyright (c) 2021 The Matrix.org Foundation C.I.C.
 *
 * 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 org.matrix.android.sdk.internal.crypto.crosssigning

import com.squareup.moshi.Json
import com.squareup.moshi.JsonClass
import org.matrix.android.sdk.api.extensions.tryOrNull
import org.matrix.android.sdk.internal.di.MoshiProvider
import org.matrix.android.sdk.internal.di.SessionFilesDirectory
import java.io.File
import java.util.UUID
import javax.inject.Inject

@JsonClass(generateAdapter = true)
internal data class UpdateTrustWorkerData(
        @Json(name = "userIds")
        val userIds: List<String>,
        // When we just need to refresh the room shield (no change on user keys, but a membership change)
        @Json(name = "roomIds")
        val roomIds: List<String>? = null
)

internal class UpdateTrustWorkerDataRepository @Inject constructor(
        @SessionFilesDirectory parentDir: File
) {
    private val workingDirectory = File(parentDir, "tw")
    private val jsonAdapter = MoshiProvider.providesMoshi().adapter(UpdateTrustWorkerData::class.java)

    // Return the path of the created file
    fun createParam(userIds: List<String>, roomIds: List<String>? = null): String {
        val filename = "${UUID.randomUUID()}.json"
        workingDirectory.mkdirs()
        val file = File(workingDirectory, filename)

        UpdateTrustWorkerData(userIds = userIds, roomIds = roomIds)
                .let { jsonAdapter.toJson(it) }
                .let { file.writeText(it) }

        return filename
    }

    fun getParam(filename: String): UpdateTrustWorkerData? {
        return File(workingDirectory, filename)
                .takeIf { it.exists() }
                ?.readText()
                ?.let { jsonAdapter.fromJson(it) }
    }

    fun delete(filename: String) {
        tryOrNull("Unable to delete $filename") {
            File(workingDirectory, filename).delete()
        }
    }
}
