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package jp.gopay.sdk.utils.streams;

import io.reactivex.annotations.NonNull;

import java.util.concurrent.TimeUnit;

public class StreamOptions {

    // I am hoping this class can be extended with some nice quality of life additions such as:
    // * Number of retries on a failed step (with a retry library)
    // * A back off policy (exponential, linear, fibonacci, etc).
    // * Reject/Accept results
    // * Number of executors to run on

    private static final WindowOptions DEFAULT_WINDOW_OPTIONS = new WindowOptions(new WindowSize(5), 100, TimeUnit.MILLISECONDS);

    private WindowOptions windowOptions;

    private Integer parallelism;

    private StreamOptions() {}

    public static StreamOptions newInstance() {
        return new StreamOptions();
    }

    public WindowOptions getWindowOptions() {
        return windowOptions == null ? DEFAULT_WINDOW_OPTIONS : windowOptions;
    }

    public StreamOptions setWindowOptions(@NonNull WindowOptions windowOptions) {
        this.windowOptions = windowOptions;
        return this;
    }

    public int getParallelism() {
        if (parallelism == null) {
            return Runtime.getRuntime().availableProcessors();
        }
        return parallelism;
    }

    public StreamOptions setParallelism(Integer parallelism) {
        this.parallelism = parallelism;
        return this;
    }
}