/*
 * Copyright 2023 LiveKit, Inc.
 *
 * 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.livekit.android.events

import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.flow.MutableSharedFlow
import kotlinx.coroutines.flow.asSharedFlow
import kotlinx.coroutines.launch

class BroadcastEventBus<T> : EventListenable<T> {
    private val mutableEvents = MutableSharedFlow<T>(extraBufferCapacity = Int.MAX_VALUE)
    override val events = mutableEvents.asSharedFlow()

    suspend fun postEvent(event: T) {
        mutableEvents.emit(event)
    }

    fun tryPostEvent(event: T) {
        mutableEvents.tryEmit(event)
    }

    fun postEvent(event: T, scope: CoroutineScope): Job {
        return scope.launch { postEvent(event) }
    }

    suspend fun postEvents(eventsToPost: Collection<T>) {
        eventsToPost.forEach { event ->
            mutableEvents.emit(event)
        }
    }

    fun postEvents(eventsToPost: Collection<T>, scope: CoroutineScope): Job {
        return scope.launch { postEvents(eventsToPost) }
    }

    fun readOnly(): EventListenable<T> = this
}