window["require_setup"](module);

import {audio as naudio} from "teaclient_connection";
// <reference types="../imports/import_shared.d.ts" />
/// <reference types="../../modules/renderer/imports/imports_shared.d.ts" />

export namespace _audio.recorder {
    import InputDevice = audio.recorder.InputDevice;
    import AbstractInput = audio.recorder.AbstractInput;

    interface NativeDevice extends InputDevice {
        device_index: number;
        native: any;
    }

    let _device_cache: NativeDevice[] = undefined;
    export function devices() : InputDevice[] {
        //TODO: Handle device updates!
        if(!naudio.initialized()) return [];

        return _device_cache || (_device_cache = naudio.available_devices().filter(e => e.input_supported || e.input_default).map(e => {
            return {
                unique_id: e.device_id,
                channels: 2, /* TODO */
                default_input: e.input_default,
                supported: e.input_supported,
                name: e.name,
                driver: e.driver,
                sample_rate: 48000, /* TODO! */
                native: e
            } as NativeDevice
        }));
    }

    export function device_refresh_available() : boolean { return false; }
    export function refresh_devices() : Promise<void> { throw "not supported yet!"; }

    export function create_input() : AbstractInput {
        return new NativeInput();
    }

    namespace filter {
        export abstract class NativeFilter implements audio.recorder.filter.Filter {
            type: audio.recorder.filter.Type;
            handle: NativeInput;
            enabled: boolean = false;

            protected constructor(handle, type) { this.handle = handle; this.type = type; }

            abstract initialize();
            abstract finalize();


            is_enabled(): boolean { return this.enabled; }
        }

        export class NThresholdFilter extends NativeFilter implements audio.recorder.filter.ThresholdFilter {
            private filter: naudio.record.ThresholdConsumeFilter;

            private _margin_frames: number = 6; /* 120ms */
            private _threshold: number = 50;
            private _callback_level: any;

            private _attack_smooth = 0;
            private _release_smooth = 0;

            callback_level: (level: number) => any;

            constructor(handle) {
                super(handle, audio.recorder.filter.Type.THRESHOLD);

                Object.defineProperty(this, 'callback_level', {
                    get(): any {
                        return this._callback_level;
                    }, set(v: any): void {
                        if(v === this._callback_level)
                            return;

                        this._callback_level = v;
                        if(this.filter)
                            this.filter.set_analyze_filter(v);
                    },
                    enumerable: true,
                    configurable: false,
                })
            }

            get_margin_frames(): number {
                return this.filter ? this.filter.get_margin_frames() : this._margin_frames;
            }

            get_threshold(): number {
                return this.filter ? this.filter.get_threshold() : this._threshold;
            }

            set_margin_frames(value: number) {
                this._margin_frames = value;
                if(this.filter)
                    this.filter.set_margin_frames(value);
            }

            get_attack_smooth(): number {
                return this.filter ? this.filter.get_attack_smooth() : this._attack_smooth;
            }

            get_release_smooth(): number {
                return this.filter ? this.filter.get_release_smooth() : this._release_smooth;
            }

            set_attack_smooth(value: number) {
                this._attack_smooth = value;
                if(this.filter)
                    this.filter.set_attack_smooth(value);
            }

            set_release_smooth(value: number) {
                this._release_smooth = value;
                if(this.filter)
                    this.filter.set_release_smooth(value);
            }

            set_threshold(value: number): Promise<void> {
                if(typeof(value) === "string")
                    value = parseInt(value); /* yes... this happens */
                this._threshold = value;
                if(this.filter)
                    this.filter.set_threshold(value);
                return Promise.resolve();
            }

            finalize() {
                if(this.filter) {
                    if(this.handle.consumer)
                        this.handle.consumer.unregister_filter(this.filter);
                    this.filter = undefined;
                }
            }

            initialize() {
                if(!this.handle.consumer)
                    return;

                this.finalize();
                this.filter = this.handle.consumer.create_filter_threshold(this._threshold);
                if(this._callback_level)
                    this.filter.set_analyze_filter(this._callback_level);
                this.filter.set_margin_frames(this._margin_frames);
                this.filter.set_attack_smooth(this._attack_smooth);
                this.filter.set_release_smooth(this._release_smooth);
            }
        }

        export class NStateFilter extends NativeFilter implements audio.recorder.filter.StateFilter {
            private filter: naudio.record.StateConsumeFilter;
            private active = false;

            constructor(handle) {
                super(handle, audio.recorder.filter.Type.STATE);
            }

            finalize() {
                if(this.filter) {
                    if(this.handle.consumer)
                        this.handle.consumer.unregister_filter(this.filter);
                    this.filter = undefined;
                }
            }

            initialize() {
                if(!this.handle.consumer)
                    return;

                this.finalize();
                this.filter = this.handle.consumer.create_filter_state();
                this.filter.set_consuming(this.active);
            }

            is_active(): boolean {
                return this.active;
            }

            async set_state(state: boolean): Promise<void> {
                if(this.active === state)
                    return;
                this.active = state;
                if(this.filter)
                    this.filter.set_consuming(state);
            }
        }

        export class NVoiceLevelFilter extends NativeFilter implements audio.recorder.filter.VoiceLevelFilter {
            private filter: naudio.record.VADConsumeFilter;
            private level = 3;
            private _margin_frames = 5;

            constructor(handle) {
                super(handle, audio.recorder.filter.Type.VOICE_LEVEL);
            }

            finalize() {
                if(this.filter) {
                    if(this.handle.consumer)
                        this.handle.consumer.unregister_filter(this.filter);
                    this.filter = undefined;
                }
            }

            initialize() {
                if(!this.handle.consumer)
                    return;

                this.finalize();
                this.filter = this.handle.consumer.create_filter_vad(this.level);
                this.filter.set_margin_frames(this._margin_frames);
            }

            get_level(): number {
                return this.level;
            }

            set_level(value: number) {
                if(this.level === value)
                    return;

                this.level = value;
                if(this.filter) {
                    this.finalize();
                    this.initialize();
                }
            }

            set_margin_frames(value: number) {
                this._margin_frames = value;
                if(this.filter)
                    this.filter.set_margin_frames(value);
            }

            get_margin_frames(): number {
                return this.filter ? this.filter.get_margin_frames() : this._margin_frames;
            }
        }
    }

    export class NativeInput implements AbstractInput {
        private handle: naudio.record.AudioRecorder;
        consumer: naudio.record.AudioConsumer;

        private _current_device: audio.recorder.InputDevice;
        private _current_state: audio.recorder.InputState = audio.recorder.InputState.PAUSED;

        callback_begin: () => any;
        callback_end: () => any;

        private filters: filter.NativeFilter[] = [];

        constructor() {
            this.handle = naudio.record.create_recorder();

            this.consumer = this.handle.create_consumer();
            this.consumer.callback_ended = () => {
                if(this._current_state !== audio.recorder.InputState.RECORDING)
                    return;

                this._current_state = audio.recorder.InputState.DRY;
                if(this.callback_end)
                    this.callback_end();
            };
            this.consumer.callback_started = () => {
                if(this._current_state !== audio.recorder.InputState.DRY)
                    return;

                this._current_state = audio.recorder.InputState.RECORDING;
                if(this.callback_begin)
                    this.callback_begin();
            };

            this._current_state = audio.recorder.InputState.PAUSED;
        }

        /* TODO: some kind of finalize? */
        current_consumer(): audio.recorder.InputConsumer | undefined {
            return {
                type: audio.recorder.InputConsumerType.NATIVE
            };
        }

        async set_consumer(consumer: audio.recorder.InputConsumer): Promise<void> {
            if(typeof(consumer) !== "undefined")
                throw "we only support native consumers!"; /* TODO: May create a general wrapper? */
            return;
        }

        async set_device(_device: audio.recorder.InputDevice | undefined): Promise<void> {
            if(_device === this._current_device)
                return;

            this._current_device = _device;
            try {
                await new Promise(resolve => this.handle.set_device(this._current_device ? this._current_device.unique_id : undefined, resolve));
                if(this._current_state !== audio.recorder.InputState.PAUSED && this._current_device)
                    await new Promise((resolve, reject) => {
                        this.handle.start(flag => {
                            if(typeof flag === "boolean" && flag)
                                resolve();
                            else
                                reject(typeof flag === "string" ? flag : "failed to start");
                        });
                    });
            } catch(error) {
                console.warn(tr("Failed to start playback on new input device (%o)"), error);
                throw error;
            }
        }

        current_device(): audio.recorder.InputDevice | undefined {
            return this._current_device;
        }

        current_state(): audio.recorder.InputState {
            return this._current_state;
        }

        disable_filter(type: audio.recorder.filter.Type) {
            const filter = this.get_filter(type) as filter.NativeFilter;
            if(filter.is_enabled())
                filter.enabled = false;
            filter.finalize();
        }

        enable_filter(type: audio.recorder.filter.Type) {
            const filter = this.get_filter(type) as filter.NativeFilter;
            if(!filter.is_enabled()) {
                filter.enabled = true;
                filter.initialize();
            }
        }

        clear_filter() {
            for(const filter of this.filters) {
                filter.enabled = false;
                filter.finalize();
            }
        }

        get_filter(type: audio.recorder.filter.Type): audio.recorder.filter.Filter | undefined {
            for(const filter of this.filters)
                if(filter.type === type)
                    return filter;

            let _filter: filter.NativeFilter;
            switch (type) {
                case audio.recorder.filter.Type.THRESHOLD:
                    _filter = new filter.NThresholdFilter(this);
                    break;
                case audio.recorder.filter.Type.STATE:
                    _filter = new filter.NStateFilter(this);
                    break;
                case audio.recorder.filter.Type.VOICE_LEVEL:
                    _filter = new filter.NVoiceLevelFilter(this);
                    break;
                default:
                    throw "this filter isn't supported!";
            }
            this.filters.push(_filter);
            return _filter;
        }

        supports_filter(type: audio.recorder.filter.Type) : boolean {
            switch (type) {
                case audio.recorder.filter.Type.THRESHOLD:
                case audio.recorder.filter.Type.STATE:
                case audio.recorder.filter.Type.VOICE_LEVEL:
                    return true;
                default:
                    return false;
            }
        }

        async start(): Promise<audio.recorder.InputStartResult> {
            try {
                await this.stop();
            } catch(error) {
                console.warn(tr("Failed to stop old record session before start (%o)"), error);
            }

            this._current_state = audio.recorder.InputState.DRY;
            try {
                if(this._current_device)
                    await new Promise((resolve, reject) => {
                        this.handle.start(flag => {
                            if(flag)
                                resolve();
                            else
                                reject("start failed");
                        });
                    });
                for(const filter of this.filters)
                    if(filter.is_enabled())
                        filter.initialize();
                return audio.recorder.InputStartResult.EOK;
            } catch(error) {
                this._current_state = audio.recorder.InputState.PAUSED;
                throw error;
            }
        }

        async stop(): Promise<void> {
            this.handle.stop();
            for(const filter of this.filters)
                filter.finalize();
            if(this.callback_end)
                this.callback_end();
            this._current_state = audio.recorder.InputState.PAUSED;
        }

        get_volume(): number {
            return this.handle.get_volume();
        }

        set_volume(volume: number) {
            this.handle.set_volume(volume);
        }
    }

    export async function create_levelmeter(device: InputDevice) : Promise<audio.recorder.LevelMeter> {
        const meter = new NativeLevelmenter(device as any);
        await meter.initialize();
        return meter;
    }

    class NativeLevelmenter implements audio.recorder.LevelMeter {
        readonly _device: NativeDevice;

        private _callback: (num: number) => any;
        private _recorder: naudio.record.AudioRecorder;
        private _consumer: naudio.record.AudioConsumer;
        private _filter: naudio.record.ThresholdConsumeFilter;

        constructor(device: NativeDevice) {
            this._device = device;
        }

        async initialize() {
            try {
                this._recorder = naudio.record.create_recorder();
                this._consumer = this._recorder.create_consumer();

                this._filter = this._consumer.create_filter_threshold(.5);
                this._filter.set_attack_smooth(.75);
                this._filter.set_release_smooth(.75);

                await new Promise(resolve => this._recorder.set_device(this._device ? this._device.unique_id : undefined, resolve));
                await new Promise((resolve, reject) => {
                    this._recorder.start(flag => {
                        if(typeof flag === "boolean" && flag)
                            resolve();
                        else
                            reject(typeof flag === "string" ? flag : "failed to start");
                    });
                });
            } catch(error) {
                if(typeof(error) === "string")
                    throw error;
                console.warn(tr("Failed to initialize levelmeter for device %o: %o"), this._device, error);
                throw "initialize failed (lookup console)";
            }

            /* references this variable, needs a destory() call, else memory leak */
            this._filter.set_analyze_filter(value => {
                (this._callback || (() => {}))(value);
            });
        }

        destory() {
            if(this._filter) {
                this._filter.set_analyze_filter(undefined);
                this._consumer.unregister_filter(this._filter);
            }
            if(this._consumer)
                this._recorder.delete_consumer(this._consumer);
            this._recorder.stop();
            this._recorder.set_device(undefined, () => {}); /* -1 := No device */
            this._recorder = undefined;
            this._consumer = undefined;
            this._filter = undefined;
        }

        device(): audio.recorder.InputDevice {
            return this._device;
        }

        set_observer(callback: (value: number) => any) {
            this._callback = callback;
        }
    }
}

Object.assign(window["audio"] || (window["audio"] = {} as any), _audio);