// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.

import PropTypes from 'prop-types';
import React from 'react';

import loadingGif from 'images/load.gif';

import Constants from 'utils/constants.jsx';
import * as Utils from 'utils/utils.jsx';

import {getFileUrl, getFileThumbnailUrl} from 'mattermost-redux/utils/file_utils';

export default class FilePreview extends React.Component {
    static propTypes = {
        onRemove: PropTypes.func.isRequired,
        fileInfos: PropTypes.arrayOf(PropTypes.object).isRequired,
        uploadsInProgress: PropTypes.array
    };

    static defaultProps = {
        fileInfos: [],
        uploadsInProgress: []
    };

    constructor(props) {
        super(props);

        this.handleRemove = this.handleRemove.bind(this);
    }

    componentDidUpdate() {
        if (this.props.uploadsInProgress.length > 0) {
            this.refs[this.props.uploadsInProgress[0]].scrollIntoView();
        }
    }

    handleRemove(id) {
        this.props.onRemove(id);
    }

    render() {
        var previews = [];
        const fileInfos = this.props.fileInfos.sort((a, b) => a.create_at - b.create_at);
        fileInfos.forEach((info) => {
            const type = Utils.getFileType(info.extension);

            let className = 'file-preview';
            let previewImage;
            if (type === 'svg') {
                previewImage = (
                    <img
                        className='post-image normal'
                        src={getFileUrl(info.id)}
                    />
                );
            } else if (type === 'image') {
                let imageClassName = 'post-image';

                if (info.width < Constants.THUMBNAIL_WIDTH && info.height < Constants.THUMBNAIL_HEIGHT) {
                    imageClassName += ' small';
                } else {
                    imageClassName += ' normal';
                }

                previewImage = (
                    <div
                        className={imageClassName}
                        style={{
                            backgroundImage: `url(${getFileThumbnailUrl(info.id)})`
                        }}
                    />
                );
            } else {
                className += ' custom-file';
                previewImage = <div className={'file-icon ' + Utils.getIconClassName(type)}/>;
            }

            previews.push(
                <div
                    key={info.id}
                    className={className}
                >
                    {previewImage}
                    <a
                        className='file-preview__remove'
                        onClick={this.handleRemove.bind(this, info.id)}
                    >
                        <i className='fa fa-remove'/>
                    </a>
                </div>
            );
        });

        this.props.uploadsInProgress.forEach((clientId) => {
            previews.push(
                <div
                    ref={clientId}
                    key={clientId}
                    className='file-preview'
                    data-client-id={clientId}
                >
                    <img
                        className='spinner'
                        src={loadingGif}
                    />
                    <a
                        className='file-preview__remove'
                        onClick={this.handleRemove.bind(this, clientId)}
                    >
                        <i className='fa fa-remove'/>
                    </a>
                </div>
            );
        });

        return (
            <div
                className='file-preview__container'
                ref='container'
            >
                {previews}
            </div>
        );
    }
}
