using System;
using System.Runtime.InteropServices.JavaScript;
using System.Threading.Tasks;

namespace Susurrus.WebAudio.Testbed
{
    /// <summary>
    /// What the testbed needs from its page, mirroring testbed.js.
    /// </summary>
    public static partial class TestbedInterop
    {
        private static Task loadTask;

        public static Task EnsureLoadedAsync()
        {
            return loadTask ??= JSHost.ImportAsync("susurrus-testbed", "../testbed.js");
        }

        [JSImport("isTestMode", "susurrus-testbed")]
        public static partial bool IsTestMode();

        [JSImport("report", "susurrus-testbed")]
        public static partial void Report(string line, string kind);

        [JSImport("newOfflineContext", "susurrus-testbed")]
        public static partial JSObject NewOfflineContext(int channelCount, int frameCount, int sampleRate);

        [JSImport("newOfflineContextWithoutCodecs", "susurrus-testbed")]
        public static partial JSObject NewOfflineContextWithoutCodecs(int channelCount, int frameCount, int sampleRate);

        [JSImport("newSuspendedAudioContext", "susurrus-testbed")]
        [return: JSMarshalAs<JSType.Promise<JSType.Object>>]
        public static partial Task<JSObject> NewSuspendedAudioContext();

        [JSImport("closeContext", "susurrus-testbed")]
        public static partial void CloseContext(JSObject context);

        [JSImport("pressPointer", "susurrus-testbed")]
        public static partial void PressPointer();

        [JSImport("render", "susurrus-testbed")]
        [return: JSMarshalAs<JSType.Promise<JSType.Object>>]
        public static partial Task<JSObject> Render(JSObject context);

        [JSImport("renderWithTicks", "susurrus-testbed")]
        [return: JSMarshalAs<JSType.Promise<JSType.Object>>]
        public static partial Task<JSObject> RenderWithTicks(
            JSObject context, double intervalSeconds, [JSMarshalAs<JSType.Function>] Action tick);

        [JSImport("maxDifference", "susurrus-testbed")]
        public static partial double MaxDifference(JSObject first, JSObject second, int channel);

        [JSImport("peak", "susurrus-testbed")]
        public static partial double Peak(JSObject buffer, int channel, int startFrame, int endFrame);

        [JSImport("lastLoudFrame", "susurrus-testbed")]
        public static partial int LastLoudFrame(JSObject buffer, int channel, double threshold);
    }
}