// Type definitions for html2canvas.js 1.0-alpha
// Project: https://github.com/niklasvh/html2canvas
// Definitions by: Richard Hepburn <https://github.com/rwhepburn>, Pei-Tang Huang <https://github.com/tan9>, Sebastian Schocke <https://github.com/sschocke>, Rickard Staaf <https://github.com/Ristaaf>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
// TypeScript Version: 2.3

/// <reference types="jquery"/>

declare namespace Html2Canvas {
    interface Html2CanvasOptions {
        /** Whether to parse and render the element asynchronously */
        async?: boolean;

        /** Whether to allow cross-origin images to taint the canvas */
        allowTaint?: boolean;

        /** Canvas background color, if none is specified in DOM. Set undefined for transparent */
        backgroundColor?: string;

        /** Existing canvas element to use as a base for drawing on */
        canvas?: any;

        /** Whether to use ForeignObject rendering if the browser supports it */
        foreignObjectRendering?: boolean;
        
        /** Predicate function which removes the matching elements from the render. */
        ignoreElements?: (element: HTMLElement) => boolean;
        
        /** Timeout for loading images, in milliseconds. Setting it to 0 will result in no timeout. */
        imageTimeout?: number;
        
        /** Whether to render each letter seperately. Necessary if letter-spacing is used. */
        letterRendering?: boolean;

        /** Whether to log events in the console. */
        logging?: boolean;

        /** Callback function which is called when the Document has been cloned for rendering, can be used to modify the contents that will be rendered without affecting the original source document. */
        onclone?: { (doc: HTMLDocument): void };

        /** Url to the proxy which is to be used for loading cross-origin images. If left empty, cross-origin images won't be loaded. */
        proxy?: string;

        /** Whether to cleanup the cloned DOM elements html2canvas creates temporarily */
        removeContainer?: boolean;

        /** The scale to use for rendering. Defaults to the browsers device pixel ratio. */
        scale?: number;

        /** Use svg powered rendering where available (FF11+). */
        svgRendering?: boolean;
        
        /** Whether to test each image if it taints the canvas before drawing them */
        taintTest?: boolean;

        /** Whether to attempt to load cross-origin images as CORS served, before reverting back to proxy. */
        useCORS?: boolean;

        /** Define the width of the canvas in pixels. If null, renders with full width of the window. */
        width?: number;

        /** Define the heigt of the canvas in pixels. If null, renders with full height of the window. */
        height?: number;

        /** Crop canvas x-coordinate */
        x?: number;

        /** Crop canvas y-coordinate */
        y?: number;

        /** The x-scroll position to used when rendering element, (for example if the Element uses position: fixed ) */
        scrollX?: number;

        /** The y-scroll position to used when rendering element, (for example if the Element uses position: fixed ) */
        scrollY?: number;

        /** Window width to use when rendering Element, which may affect things like Media queries */
        windowWidth?: number;

        /** Window height to use when rendering Element, which may affect things like Media queries */
        windowHeight?: number;
    }
}

interface Html2CanvasStatic {

    /**
      * Renders an HTML element to a canvas so that a screenshot can be generated.
      *
      * The screenshot is based on the DOM and as such may not be 100% accurate to the real representation as it does not make an actual screenshot,
      * but builds the screenshot based on the information available on the page.
      *
      * @param {HTMLElement} element The HTML element which will be rendered to the canvas. Use the root element to render the entire window.
      * @param {Html2CanvasOptions} options The options object that controls how the element will be rendered.
      */
    (element: HTMLElement, options?: Html2Canvas.Html2CanvasOptions): Html2CanvasPromise<HTMLCanvasElement>;
}

// FIXME:
// Find out a way to dependent on real Promise interface.
// And remove following custome Promise interface.
interface Html2CanvasThenable<R> {
    then<U>(onFulfilled?: (value: R) => U | Html2CanvasThenable<U>, onRejected?: (error: any) => U | Html2CanvasThenable<U>): Html2CanvasThenable<U>;
    then<U>(onFulfilled?: (value: R) => U | Html2CanvasThenable<U>, onRejected?: (error: any) => void): Html2CanvasThenable<U>;
}

interface Html2CanvasPromise<R> extends Html2CanvasThenable<R> {
    then<U>(onFulfilled?: (value: R) => U | Html2CanvasThenable<U>, onRejected?: (error: any) => U | Html2CanvasThenable<U>): Html2CanvasPromise<U>;
    then<U>(onFulfilled?: (value: R) => U | Html2CanvasThenable<U>, onRejected?: (error: any) => void): Html2CanvasPromise<U>;
    catch<U>(onRejected?: (error: any) => U | Html2CanvasThenable<U>): Html2CanvasPromise<U>;
}

declare module 'html2canvas' {
    export = html2canvas;
}

declare var html2canvas: Html2CanvasStatic;