export type HowlCallback = (soundId: number) => void;
export type HowlErrorCallback = (soundId: number, error: unknown) => void;
export type SpatialOrientation = [number, number, number];
export type SpatialPosition = [number, number, number];

export interface SoundSpriteDefinitions {
    [name: string]: [number, number] | [number, number, boolean];
}

export interface PannerAttributes {
    coneInnerAngle?: number | undefined;
    coneOuterAngle?: number | undefined;
    coneOuterGain?: number | undefined;
    distanceModel?: "inverse" | "linear";
    maxDistance?: number;
    panningModel?: "HRTF" | "equalpower";
    refDistance?: number;
    rolloffFactor?: number;
}

export interface HowlListeners {
    /** Fires when the sound has been stopped. The first parameter is the ID of the sound. */
    onstop?: HowlCallback | undefined;

    /** Fires when the sound has been paused. The first parameter is the ID of the sound. */
    onpause?: HowlCallback | undefined;

    /** Fires when the sound is loaded. */
    onload?: HowlCallback | undefined;

    /** Fires when the sound has been muted/unmuted. The first parameter is the ID of the sound. */
    onmute?: HowlCallback | undefined;

    /** Fires when the sound's volume has changed. The first parameter is the ID of the sound. */
    onvolume?: HowlCallback | undefined;

    /** Fires when the sound's playback rate has changed. The first parameter is the ID of the sound. */
    onrate?: HowlCallback | undefined;

    /** Fires when the sound has been seeked. The first parameter is the ID of the sound. */
    onseek?: HowlCallback | undefined;

    /** Fires when the current sound finishes fading in/out. The first parameter is the ID of the sound. */
    onfade?: HowlCallback | undefined;

    /** Fires when audio has been automatically unlocked through a touch/click event. */
    onunlock?: HowlCallback | undefined;

    /**
     * Fires when the sound finishes playing (if it is looping, it'll fire at the end of each loop).
     * The first parameter is the ID of the sound.
     */
    onend?: HowlCallback | undefined;

    /** Fires when the sound begins playing. The first parameter is the ID of the sound. */
    onplay?: HowlCallback | undefined;

    /**
     * Fires when the sound is unable to load. The first parameter is the ID
     * of the sound (if it exists) and the second is the error message/code.
     */
    onloaderror?: HowlErrorCallback | undefined;

    /**
     * Fires when the sound is unable to play. The first parameter is
     * the ID of the sound and the second is the error message/code.
     */
    onplayerror?: HowlErrorCallback | undefined;
}

export interface HowlOptions extends HowlListeners, PannerAttributes {
    /**
     * The sources to the track(s) to be loaded for the sound (URLs or base64 data URIs). These should
     * be in order of preference, howler.js will automatically load the first one that is compatible
     * with the current browser. If your files have no extensions, you will need to explicitly specify
     * the extension using the format property.
     */
    src: string | string[];

    /**
     * The volume of the specific track, from 0.0 to 1.0.
     * @default 1.0
     */
    volume?: number | undefined;

    /**
     * Set to true to force HTML5 Audio. This should be used for large audio files so that you don't
     * have to wait for the full file to be downloaded and decoded before playing.
     * @default false
     */
    html5?: boolean | undefined;

    /**
     * Set to true to automatically loop the sound forever.
     * @default false
     */
    loop?: boolean | undefined;

    /**
     * Automatically begin downloading the audio file when the Howl is defined. If using HTML5 Audio,
     * you can set this to 'metadata' to only preload the file's metadata (to get its duration without
     * download the entire file, for example).
     * @default true
     */
    preload?: boolean | "metadata" | undefined;

    /**
     * Set to true to automatically start playback when sound is loaded.
     * @default false
     */
    autoplay?: boolean | undefined;

    /**
     * Set to true to load the audio muted.
     * @default false
     */
    mute?: boolean | undefined;

    /**
     * Define a sound sprite for the sound. The offset and duration are defined in milliseconds. A
     * third (optional) parameter is available to set a sprite as looping. An easy way to generate
     * compatible sound sprites is with audiosprite.
     */
    sprite?: SoundSpriteDefinitions | undefined;

    /**
     * The rate of playback. 0.5 to 4.0, with 1.0 being normal speed.
     * @default 1.0
     */
    rate?: number | undefined;

    /**
     * The size of the inactive sounds pool. Once sounds are stopped or finish playing, they are marked
     * as ended and ready for cleanup. We keep a pool of these to recycle for improved performance.
     * Generally this doesn't need to be changed. It is important to keep in mind that when a sound is
     * paused, it won't be removed from the pool and will still be considered active so that it can be
     * resumed later.
     * @default 5
     */
    pool?: number | undefined;

    /**
     * howler.js automatically detects your file format from the extension, but you may also specify a
     * format in situations where extraction won't work (such as with a SoundCloud stream).
     */
    format?: string | string[] | undefined;

    /**
     * When using Web Audio, howler.js uses an XHR request to load the audio files. If you need to send
     * custom headers, set the HTTP method or enable withCredentials (see reference), include them with
     * this parameter. Each is optional (method defaults to GET, headers default to null and
     * withCredentials defaults to false).
     */
    xhr?:
        | {
            method?: string | undefined;
            headers?: Record<string, string> | undefined;
            withCredentials?: boolean | undefined;
        }
        | undefined;
}

export class Howl {
    constructor(options: HowlOptions);

    play(spriteOrId?: string | number): number; // .play() is not chainable; the other methods are
    pause(id?: number): this;
    stop(id?: number): this;

    mute(): boolean;
    mute(muted: boolean, id?: number): this;

    volume(): number;
    volume(idOrSetVolume: number): this | number;
    volume(volume: number, id: number): this;

    fade(from: number, to: number, duration: number, id?: number): this;

    rate(id?: number): number;
    rate(rate: number, id?: number): this;

    seek(id?: number): number;
    seek(seek: number, id?: number): this;

    loop(id?: number): boolean;
    loop(loop: boolean, id?: number): this;

    playing(id?: number): boolean;
    duration(id?: number): number;
    state(): "unloaded" | "loading" | "loaded";
    load(): this;
    unload(): null;

    on(event: "load", callback: () => void, id?: number): this;
    on(event: "loaderror" | "playerror", callback: HowlErrorCallback, id?: number): this;
    on(
        event: "play" | "end" | "pause" | "stop" | "mute" | "volume" | "rate" | "seek" | "fade" | "unlock",
        callback: HowlCallback,
        id?: number,
    ): this;
    on(event: string, callback: HowlCallback | HowlErrorCallback, id?: number): this;

    once(event: "load", callback: () => void, id?: number): this;
    once(event: "loaderror" | "playerror", callback: HowlErrorCallback, id?: number): this;
    once(
        event: "play" | "end" | "pause" | "stop" | "mute" | "volume" | "rate" | "seek" | "fade" | "unlock",
        callback: HowlCallback,
        id?: number,
    ): this;
    once(event: string, callback: HowlCallback | HowlErrorCallback, id?: number): this;

    off(event: "load", callback?: () => void, id?: number): this;
    off(event: "loaderror" | "playerror", callback?: HowlErrorCallback, id?: number): this;
    off(
        event: "play" | "end" | "pause" | "stop" | "mute" | "volume" | "rate" | "seek" | "fade" | "unlock",
        callback?: HowlCallback,
        id?: number,
    ): this;
    // off() also supports passing id as second argument: internally it is type checked and treated as an id if it is a number
    off(
        event:
            | "load"
            | "loaderror"
            | "playerror"
            | "play"
            | "end"
            | "pause"
            | "stop"
            | "mute"
            | "volume"
            | "rate"
            | "seek"
            | "fade"
            | "unlock",
        id: number,
    ): this;
    off(event?: string, callback?: HowlCallback | HowlErrorCallback, id?: number): this;

    stereo(): number;
    stereo(pan: number, id?: number): number | this;

    pos(): SpatialPosition;
    pos(x: number, y?: number, z?: number, id?: number): this;

    orientation(): SpatialOrientation;
    orientation(x: number, y?: number, z?: number, id?: number): this;

    pannerAttr(id?: number): PannerAttributes;
    pannerAttr(options: PannerAttributes, id?: number): this;
}

export interface HowlerGlobal {
    mute(muted: boolean): this;
    stop(): this;

    volume(): number;
    volume(volume: number): this;

    codecs(ext: string): boolean;
    unload(): this;
    usingWebAudio: boolean;
    html5PoolSize: number;
    noAudio: boolean;
    autoUnlock: boolean;
    autoSuspend: boolean;
    ctx: AudioContext;
    masterGain: GainNode;

    stereo(pan: number): this;

    pos(): SpatialPosition;
    pos(x: number, y?: number, z?: number): this;

    orientation(): SpatialOrientation;
    orientation(x: number, y?: number, z?: number, xUp?: number, yUp?: number, zUp?: number): this;
}

import { Howl as _Howl, HowlerGlobal as _HowlerGlobal } from ".";
export { Howler };

declare global {
    // tslint:disable:no-empty-interface
    interface Howl extends _Howl {}
    interface HowlerGlobal extends _HowlerGlobal {}
    var Howl: typeof _Howl;
    var HowlerGlobal: {
        prototype: _HowlerGlobal;
        new(): _HowlerGlobal;
    };
    var Howler: HowlerGlobal;
}