/**
 * Peaks.js TypeScript Definitions
 * @author Evan Louie <evan.louie@microsoft.com> (https://evanlouie.com)
 */

declare module 'peaks.js' {
  interface SegmentAddOptions {
    startTime: number;
    endTime: number;
    editable?: boolean;
    color?: string;
    selectedColor?: string;
    selectedTextColor?: string;
    selectedHandleTextColor?: string;
    selectedBorderColor?: string;
    labelText?: string;
    id?: string;
  }

  interface SegmentUpdateOptions {
    startTime?: number;
    endTime?: number;
    editable?: boolean;
    color?: string;
    selectedColor?: string;
    selectedTextColor?: string;
    selectedHandleTextColor?: string;
    selectedBorderColor?: string;
    labelText?: string;
  }

  interface Segment extends SegmentAddOptions {
    update: (options: SegmentUpdateOptions) => void;
  }

  interface PointAddOptions {
    time: number;
    editable?: boolean;
    color?: string;
    labelText?: string;
    id?: string;
  }

  interface PointUpdateOptions {
    time?: number;
    editable?: boolean;
    color?: string;
    labelText?: string;
  }

  interface Point extends PointAddOptions {
    update: (options: PointUpdateOptions) => void;
  }

  interface RequiredOptions {
    /** HTML5 Media element containing an audio track */
    mediaElement: Element;
  }

  interface SingleContainerOptions {
    /** Container element for the waveform views */
    container: HTMLElement;
  }

  interface ViewContainerOptions {
    containers: {
      /** Container element for the overview (non-zoomable) waveform view */
      overview?: HTMLElement | null;
      /** Container element for the zoomable waveform view */
      zoomview?: HTMLElement | null;
    }
  }

  type ContainerOptions = SingleContainerOptions | ViewContainerOptions;

  interface PreGeneratedWaveformOptions {
    /** URI to waveform data file in binary or JSON */
    dataUri?: {
      arraybuffer?: string;
      json?: string;
    }
    /** raw waveform data file in binary or JSON */
    waveformData?: {
      arraybuffer?: ArrayBuffer;
      json?: JsonWaveformData;
    }
  }

  interface WebAudioOptions {
    webAudio: {
      /**
       * A Web Audio AudioContext instance which can be used
       * to render the waveform if dataUri is not provided
       */
      audioContext?: AudioContext;
      /**
       * Alternatively, provide an AudioBuffer containing the decoded audio
       * samples. In this case, an AudioContext is not needed
       */
      audioBuffer?: AudioBuffer;
      scale?: number;
      multiChannel?: boolean;
    }
  }

  type AudioOptions = WebAudioOptions | PreGeneratedWaveformOptions;

  interface PointMarker {
    init: (group: object) => void; // TODO: group: Konva.Group
    fitToView: () => void;
    timeUpdated?: (time: number) => void;
    destroy?: () => void;
  }

  interface SegmentMarker {
    init: (group: object) => void; // TODO: group: Konva.Group
    fitToView: () => void;
    timeUpdated?: (time: number) => void;
    destroy?: () => void;
  }

  interface Layer {
    getHeight: () => number;
    draw: () => void;
  }

  interface CreatePointMarkerOptions {
    point: Point;
    view: string;
    draggable: boolean;
    color: string;
    layer: Layer;
  }

  interface CreateSegmentMarkerOptions {
    segment: Segment;
    view: string;
    draggable: boolean;
    color: string;
    layer: Layer;
    startMarker: boolean;
  }

  interface CreateSegmentLabelOptions {
    segment: Segment;
    view: string;
    layer: Layer;
  }

  interface OptionalOptions {
    /**
     * If true, peaks will send credentials with all network requests
     * - i.e. when fetching waveform data.
     */
    withCredentials?: boolean;
    /** async logging function */
    logger?: (...args: any[]) => void;
    /** default height of the waveform canvases in pixels */
    height?: number;
    /** Array of zoom levels in samples per pixel (big >> small) */
    zoomLevels?: number[];
    /** Bind keyboard controls */
    keyboard?: boolean;
    /** Keyboard nudge increment in seconds (left arrow/right arrow) */
    nudgeIncrement?: number;
    /** Color for segment start marker handles */
    segmentStartMarkerColor?: string;
    /** Color for segment end marker handles */
    segmentEndMarkerColor?: string;
    /** Color for the zoomed in waveform */
    zoomWaveformColor?: string;
    /** Color for the overview waveform */
    overviewWaveformColor?: string;
    /**
     * Color for the overview waveform rectangle
     * that shows what the zoom view shows
     */
    overviewHighlightColor?: string;
    /**
     * The default number of pixels from the top and bottom of the canvas
     * that the overviewHighlight takes up
     */
    overviewHighlightOffset?: number;
    /** Color for segments on the waveform */
    segmentColor?: string;
    /** Color of the play head */
    playheadColor?: string;
    /** Color of the play head text */
    playheadTextColor?: string;
    /**
     * Show current time next to the play head
     * - (zoom view only)
     */
    showPlayheadTime?: boolean;
    /** The color of a point marker */
    pointMarkerColor?: string;
    /** Color of the axis gridlines */
    axisGridlineColor?: string;
    /** Color of the axis labels */
    axisLabelColor?: string;
    /** Random color per segment (overrides segmentColor) */
    randomizeSegmentColor?: boolean;
    /**
     * Zoom view adapter to use.
     * - Valid adapters are: `'animated'` (default) and `'static'`
     */
    zoomAdapter?: string;
    /** Array of initial segment objects */
    segments?: Segment[];
    /** Array of initial point objects */
    points?: Point[];
    /** Emit cue events when playing */
    emitCueEvents?: boolean;
    /** Custom segment marker factory function */
    createSegmentMarker?: (options: CreateSegmentMarkerOptions) => SegmentMarker;
    /** Custom segment label factory function */
    createSegmentLabel?: (options: CreateSegmentLabelOptions) => object; // Konva.Node;
    /** Custom point marker factory function */
    createPointMarker?: (options: CreatePointMarkerOptions) => PointMarker;
  }

  interface SetSourceRequiredOptions {
    mediaUrl: string;
    withCredentials?: boolean;
  }

  type SetSourceOptions = SetSourceRequiredOptions & AudioOptions;

  type SetSourceCallback = (error: Error) => void;

  interface InstanceEvents {
    'peaks.ready': () => void;
    'points.add': (points: Point[]) => void;
    'points.dblclick': (point: Point) => void;
    'points.dragend': (point: Point) => void;
    'points.dragmove': (point: Point) => void;
    'points.dragstart': (point: Point) => void;
    'points.mouseenter': (point: Point) => void;
    'points.mouseleave': (point: Point) => void;
    'points.remove_all': () => void;
    'points.remove': (points: Point[]) => void;
    'points.enter': (point: Point) => void;
    'handler.segments.add': (segments: Segment[]) => void;
    'segments.dragstart': (segment: Segment, startMarker: boolean) => void;
    'segments.dragged': (segment: Segment, startMarker: boolean) => void;
    'segments.dragend': (segment: Segment, startMarker: boolean) => void;
    'handler.segments.remove_all': () => void;
    'handler.segments.remove': (segments: Segment[]) => void;
    'segments.mouseenter': (segment: Segment) => void;
    'segments.mouseleave': (segment: Segment) => void;
    'segments.click': (segment: Segment) => void;
    'segments.enter': (segment: Segment) => void;
    'segments.exit': (segment: Segment) => void;
    'overview.dblclick': (time: number) => void;
    'handler.view.dblclick': (time: number) => void;
    'handler.view.updatezoom': (currentZoomLevel: number, previousZoomLevel: number) => void;
    player_seek: (time: number) => void;
    user_seek: (time: number) => void;
  }

  interface WaveformView {
    setAmplitudeScale: (scale: number) => void;
    setWaveformColor: (color: string) => void;
    showPlayheadTime: (show: boolean) => void;
    enableAutoScroll: (enable: boolean) => void;
    enableMarkerEditing: (enable: boolean) => void;
    fitToContainer: () => void;
    setZoom: (options: XOR<{ scale: number | 'auto' }, { seconds: number | 'auto' }>) => void;
    setStartTime: (time: number) => void;
  }

  type Without<T> = { [K in keyof T]?: undefined };
  type XOR<T, U> = (Without<T> & U) | (T & Without<U>);

  interface PeaksInstance {
    setSource: (options: SetSourceOptions, callback: SetSourceCallback) => void;
    destroy: () => void;
    getSelectedElements: () => object[];
    selectSourceById: (sourceId: string, notify?: boolean) => void;
    selectSourcesOnLineAfter: (lineId: string, time: number, notify?: boolean) => void;
    selectSegmentById: (segmentId: string, notify?: boolean) => void;
    selectSegmentsOnLineAfter: (lineId: string | number, time: number, notify?: boolean) => void;
    deselectAll: (notify?: boolean) => void;
    /** Player API */
    player: {
      play: () => void;
      pause: () => void;
      getCurrentTime: () => number;
      getDuration: () => number;
      seek: (time: number) => void;
      playSegment: (segment: Segment) => void;
    };
    /** Views API */
    views: {
      createOverview: (container: HTMLElement) => WaveformView;
      createZoomview: (container: HTMLElement) => WaveformView;
      destroyOverview: () => void;
      destroyZoomview: () => void;
      getView: (name?: 'overview' | 'zoomview' ) => WaveformView | null;
    };
    /** Zoom API */
    zoom: {
      zoomOut: () => void;
      zoomIn: () => void;
      setZoom: (index: number) => void;
      getZoom: () => number;
    };
    /** Segments API */
    segments: {
      add: (segments: SegmentAddOptions | SegmentAddOptions[]) => void;
      getSegments: () => Segment[];
      getSegment: (id: string) => Segment | null;
      removeByTime: (startTime: number, endTime?: number) => Segment[];
      removeById: (segmentId: string) => Segment[];
      removeAll: () => void;
    };
    /** Points API */
    points: {
      add: (points: PointAddOptions | PointAddOptions[]) => void;
      getPoints: () => Point[];
      getPoint: (id: string) => Point | null;
      removeByTime: (time: number) => Point[];
      removeById: (id: string) => Point[];
      removeAll: () => void;
    };
    /** Events */
    on: <E extends keyof InstanceEvents>(event: E, listener: InstanceEvents[E]) => void;
  }

  type PeaksInitCallback = (error: Error, peaks?: PeaksInstance) => void;

  interface PeaksOptionsWithoutAudioOptions extends RequiredOptions, OptionalOptions {}

  export interface JsonWaveformData {
    version: number;
    channels: number;
    sample_rate: number;
    samples_per_pixel: number;
    bits: number;
    length: number;
    data: number[];
  }

  export type PeaksOptions = PeaksOptionsWithoutAudioOptions & AudioOptions & ContainerOptions;
  export function init(options: PeaksOptions, callback?: PeaksInitCallback): PeaksInstance;
}