/* @flow */

import React, { Component } from 'react';

/**
 * The type of the React {@code Component} props of
 * {@link DesktopSourcePreview}.
 */
type Props = {

    /**
     * The callback to invoke when the component is clicked. The id of the
     * clicked on DesktopCapturerSource will be passed in.
     */
    onClick: Function,

    /**
     * The callback to invoke when the component is double clicked. The id of
     * the DesktopCapturerSource will be passed in.
     */
    onDoubleClick: Function,

    /**
     * The indicator which determines whether this DesktopSourcePreview is
     * selected. If true, the 'is-selected' CSS class will be added to the root
     * of Component.
     */
    selected: boolean,

    /**
     * The DesktopCapturerSource to display.
     */
    source: Object,

    /**
     * The source type of the DesktopCapturerSources to display.
     */
    type: string
};

/**
 * React component for displaying a preview of a DesktopCapturerSource.
 *
 * @extends Component
 */
class DesktopSourcePreview extends Component<Props> {
    /**
     * Initializes a new DesktopSourcePreview instance.
     *
     * @param {Object} props - The read-only properties with which the new
     * instance is to be initialized.
     */
    constructor(props: Props) {
        super(props);

        this._onClick = this._onClick.bind(this);
        this._onDoubleClick = this._onDoubleClick.bind(this);
    }

    /**
     * Implements React's {@link Component#render()}.
     *
     * @inheritdoc
     * @returns {ReactElement}
     */
    render() {
        const selectedClass = this.props.selected ? 'is-selected' : '';
        const displayClasses = `desktop-picker-source ${selectedClass}`;

        return (
            <div
                className = { displayClasses }
                onClick = { this._onClick }
                onDoubleClick = { this._onDoubleClick }>
                <div className = 'desktop-source-preview-image-container'>
                    <img
                        className = 'desktop-source-preview-thumbnail'
                        src = { this.props.source.thumbnail.toDataURL() } />
                </div>
                <div className = 'desktop-source-preview-label'>
                    { this.props.source.name }
                </div>
            </div>
        );
    }

    _onClick: () => void;

    /**
     * Invokes the passed in onClick callback.
     *
     * @returns {void}
     */
    _onClick() {
        const { source, type } = this.props;

        this.props.onClick(source.id, type);
    }

    _onDoubleClick: () => void;

    /**
     * Invokes the passed in onDoubleClick callback.
     *
     * @returns {void}
     */
    _onDoubleClick() {
        const { source, type } = this.props;

        this.props.onDoubleClick(source.id, type);
    }
}

export default DesktopSourcePreview;