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/*
 * Copyright (c) 2018 Nam Nguyen, nam@ene.im
 *
 * 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 ml.docilealligator.infinityforreddit.videoautoplay;

import static androidx.media3.exoplayer.DefaultRenderersFactory.EXTENSION_RENDERER_MODE_OFF;
import static ml.docilealligator.infinityforreddit.videoautoplay.ToroUtil.checkNotNull;

import android.content.Context;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.OptIn;
import androidx.core.util.ObjectsCompat;
import androidx.media3.common.util.UnstableApi;
import androidx.media3.datasource.DataSource;
import androidx.media3.datasource.cache.Cache;
import androidx.media3.exoplayer.DefaultRenderersFactory;
import androidx.media3.exoplayer.ExoPlayer;
import androidx.media3.exoplayer.source.MediaSource;
import androidx.media3.exoplayer.upstream.DefaultBandwidthMeter;

/**
 * Necessary configuration for {@link ExoCreator} to produces {@link ExoPlayer} and
 * {@link MediaSource}. Instance of this class must be construct using {@link Builder}.
 *
 * @author eneim (2018/01/23).
 * @since 3.4.0
 */

@UnstableApi
@SuppressWarnings("SimplifiableIfStatement")  //
public final class Config {

    @Nullable
    private final Context context;

    // primitive flags
    @DefaultRenderersFactory.ExtensionRendererMode
    final int extensionMode;

    // NonNull options
    @NonNull
    final BaseMeter meter;
    @NonNull
    final MediaSourceBuilder mediaSourceBuilder;

    // Nullable options
    @UnstableApi
    @Nullable
    final Cache cache; // null by default
    // If null, ExoCreator must come up with a default one.
    // This is to help customizing the Data source, for example using OkHttp extension.
    @Nullable
    final DataSource.Factory dataSourceFactory;

    @OptIn(markerClass = UnstableApi.class)
    @SuppressWarnings("WeakerAccess")
    Config(@Nullable Context context, int extensionMode, @NonNull BaseMeter meter,
           @Nullable DataSource.Factory dataSourceFactory,
           @NonNull MediaSourceBuilder mediaSourceBuilder,
           @Nullable Cache cache) {
        this.context = context != null ? context.getApplicationContext() : null;
        this.extensionMode = extensionMode;
        this.meter = meter;
        this.dataSourceFactory = dataSourceFactory;
        this.mediaSourceBuilder = mediaSourceBuilder;
        this.cache = cache;
    }

    @OptIn(markerClass = UnstableApi.class)
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Config config = (Config) o;

        if (extensionMode != config.extensionMode) return false;
        if (!meter.equals(config.meter)) return false;
        if (!mediaSourceBuilder.equals(config.mediaSourceBuilder)) return false;
        if (!ObjectsCompat.equals(cache, config.cache)) return false;
        return ObjectsCompat.equals(dataSourceFactory, config.dataSourceFactory);
    }

    @OptIn(markerClass = UnstableApi.class)
    @Override
    public int hashCode() {
        int result = extensionMode;
        result = 31 * result + meter.hashCode();
        result = 31 * result + mediaSourceBuilder.hashCode();
        result = 31 * result + (cache != null ? cache.hashCode() : 0);
        result = 31 * result + (dataSourceFactory != null ? dataSourceFactory.hashCode() : 0);
        return result;
    }

    @OptIn(markerClass = UnstableApi.class)
    @SuppressWarnings("unused")
    public Builder newBuilder() {
        return new Builder(context).setCache(this.cache)
                .setExtensionMode(this.extensionMode)
                .setMediaSourceBuilder(this.mediaSourceBuilder)
                .setMeter(this.meter);
    }

    /// Builder
    @UnstableApi
    @SuppressWarnings({"unused", "WeakerAccess"}) //
    public static final class Builder {

        @Nullable // only for backward compatibility
        final Context context;

        /**
         * @deprecated Use the constructor with nonnull {@link Context} instead.
         */
        @Deprecated
        public Builder() {
            this(null);
        }

        @OptIn(markerClass = UnstableApi.class)
        public Builder(@Nullable Context context) {
            this.context = context != null ? context.getApplicationContext() : null;
            DefaultBandwidthMeter bandwidthMeter =
                    new DefaultBandwidthMeter.Builder(this.context).build();
            meter = new BaseMeter<>(bandwidthMeter);
        }

        @UnstableApi
        @DefaultRenderersFactory.ExtensionRendererMode
        private int extensionMode = EXTENSION_RENDERER_MODE_OFF;
        private BaseMeter meter;
        private DataSource.Factory dataSourceFactory = null;
        private MediaSourceBuilder mediaSourceBuilder = MediaSourceBuilder.DEFAULT;
        @UnstableApi
        private Cache cache = null;

        @OptIn(markerClass = UnstableApi.class)
        public Builder setExtensionMode(@DefaultRenderersFactory.ExtensionRendererMode int extensionMode) {
            this.extensionMode = extensionMode;
            return this;
        }

        @OptIn(markerClass = UnstableApi.class)
        public Builder setMeter(@NonNull BaseMeter meter) {
            this.meter = checkNotNull(meter, "Need non-null BaseMeter");
            return this;
        }

        // Option is Nullable, but if user customize this, it must be a Nonnull one.
        public Builder setDataSourceFactory(@NonNull DataSource.Factory dataSourceFactory) {
            this.dataSourceFactory = checkNotNull(dataSourceFactory);
            return this;
        }

        public Builder setMediaSourceBuilder(@NonNull MediaSourceBuilder mediaSourceBuilder) {
            this.mediaSourceBuilder =
                    checkNotNull(mediaSourceBuilder, "Need non-null MediaSourceBuilder");
            return this;
        }

        @OptIn(markerClass = UnstableApi.class)
        public Builder setCache(@Nullable Cache cache) {
            this.cache = cache;
            return this;
        }

        @OptIn(markerClass = UnstableApi.class)
        public Config build() {
            return new Config(context, extensionMode, meter, dataSourceFactory,
                    mediaSourceBuilder, cache);
        }
    }
}