export type Base64URLString = string;

export enum VBModel {
    landscape = "landscape",
    multiClass = "multiclass",
    meet = "meet",
}

export type VirtualBackgroundConfig = {
    /**
     * Virtual background type, can be "image" or "blur".
     */
    type: 'image' | 'blur';

    /**
     * Image URL for background (required only if `type` is "image").
     */
    imageUrl?: string;

    /**
     * Image base64 for background (required only if `type` is "image").
     */
    imageBase64?: Base64URLString;
};

export class VideoSDKVirtualBackgroundProcessor {
    /**
     * Indicates whether the processor is ready.
     */
    ready: boolean;

    /**
     * Initializes the virtual background processor.
     * @param {'landscape' | 'multiclass' | 'meet'} [model] - Segmentation model to load.
     * @returns {Promise<void>}
     */
    init(model?: 'landscape' | 'multiclass' | 'meet'): Promise<void>;

    /**
     * Starts the virtual background processor.
     * @param {MediaStream} stream - The local camera (or screen) media stream.
     * @param {VirtualBackgroundConfig} [options] - Configuration for virtual background.
     * @returns {MediaStream} - The transformed media stream with background applied.
     */
    start(stream: MediaStream, options: VirtualBackgroundConfig): Promise<MediaStream>;

    /**
     * Indicates whether the processor is currently running.
     */
    processorRunning: boolean;

    /**
     * Updates the virtual background configuration.
     * @param {VirtualBackgroundConfig} config - New configuration for the virtual background.
     * @returns {Promise<void>}
     */
    updateProcessorConfig(config: VirtualBackgroundConfig): Promise<void>;

    /**
     * Stops the virtual background processor.
     * @returns {Promise<void>}
     */
    stop(): Promise<void>;

    /**
     * Full cleanup — releases the segmenter's GPU/WASM resources.
     * After dispose(), the instance cannot be reused.
     * Use stop() for pause/resume; use dispose() when done.
     */
    dispose(): void;
}