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

import {FormattedMessage} from 'react-intl';

import loadingGif from 'images/load.gif';

import React from 'react';

export default class SettingPicture extends React.Component {
    constructor(props) {
        super(props);

        this.setPicture = this.setPicture.bind(this);
        this.confirmImage = this.confirmImage.bind(this);
    }

    setPicture(file) {
        if (file) {
            var reader = new FileReader();

            reader.onload = (e) => {
                const canvas = this.refs.profileImageCanvas;
                const context = canvas.getContext('2d');
                const imageObj = new Image();

                imageObj.onload = () => {
                    if (imageObj.width > imageObj.height) {
                        const side = imageObj.height;
                        const rem = imageObj.width - side;
                        const startX = parseInt(rem / 2, 10);
                        context.drawImage(imageObj, startX, 0, side, side,
                            0, 0, canvas.width, canvas.height);
                    } else {
                        const side = imageObj.width;
                        const rem = imageObj.height - side;
                        const startY = parseInt(rem / 2, 10);
                        context.drawImage(imageObj, 0, startY, side, side,
                            0, 0, canvas.width, canvas.height);
                    }
                };
                imageObj.src = e.target.result;
            };
            reader.readAsDataURL(file);
        }
    }

    componentWillReceiveProps(nextProps) {
        if (nextProps.picture) {
            this.setPicture(nextProps.picture);
        }
    }

    render() {
        var clientError = null;
        if (this.props.client_error) {
            clientError = <div className='form-group has-error'><label className='control-label'>{this.props.client_error}</label></div>;
        }
        var serverError = null;
        if (this.props.server_error) {
            serverError = <div className='form-group has-error'><label className='control-label'>{this.props.server_error}</label></div>;
        }

        var img = null;
        if (this.props.picture) {
            img = (
                <canvas
                    ref='profileImageCanvas'
                    className='profile-img'
                    width='256px'
                    height='256px'
                />
            );
        } else {
            img = (
                <img
                    ref='image'
                    className='profile-img rounded'
                    src={this.props.src}
                />
            );
        }

        var confirmButton;
        if (this.props.loadingPicture) {
            confirmButton = (
                <img
                    className='spinner'
                    src={loadingGif}
                />
            );
        } else {
            var confirmButtonClass = 'btn btn-sm';
            if (this.props.submitActive) {
                confirmButtonClass += ' btn-primary';
            } else {
                confirmButtonClass += ' btn-inactive disabled';
            }

            confirmButton = (
                <a
                    className={confirmButtonClass}
                    onClick={this.confirmImage}
                >
                    <FormattedMessage
                        id='setting_picture.save'
                        defaultMessage='Save'
                    />
                </a>
            );
        }
        var helpText = (
            <FormattedMessage
                id='setting_picture.help'
                defaultMessage='Upload a profile picture in either JPG or PNG format, at least {width}px in width and {height}px height.'
                values={{
                    width: global.window.mm_config.ProfileWidth,
                    height: global.window.mm_config.ProfileHeight
                }}
            />
        );

        var self = this;
        return (
            <ul className='section-max'>
                <li className='col-xs-12 section-title'>{this.props.title}</li>
                <li className='col-xs-offset-3 col-xs-8'>
                    <ul className='setting-list'>
                        <li className='setting-list-item'>
                            {img}
                        </li>
                        <li className='setting-list-item'>
                            {helpText}
                        </li>
                        <li className='setting-list-item'>
                            {serverError}
                            {clientError}
                            <span className='btn btn-sm btn-primary btn-file sel-btn'>
                                <FormattedMessage
                                    id='setting_picture.select'
                                    defaultMessage='Select'
                                />
                                <input
                                    ref='input'
                                    accept='.jpg,.png,.bmp'
                                    type='file'
                                    onChange={this.props.pictureChange}
                                />
                            </span>
                            {confirmButton}
                            <a
                                className='btn btn-sm theme'
                                href='#'
                                onClick={self.props.updateSection}
                            >
                                <FormattedMessage
                                    id='setting_picture.cancel'
                                    defaultMessage='Cancel'
                                />
                            </a>
                        </li>
                    </ul>
                </li>
            </ul>
        );
    }

    confirmImage(e) {
        e.persist();
        this.refs.profileImageCanvas.toBlob((blob) => {
            blob.lastModifiedDate = new Date();
            blob.name = 'image.jpg';
            this.props.imageCropChange(blob);
            this.props.submit(e);
        }, 'image/jpeg', 0.95);
    }
}

SettingPicture.propTypes = {
    client_error: React.PropTypes.string,
    server_error: React.PropTypes.string,
    src: React.PropTypes.string,
    picture: React.PropTypes.object,
    loadingPicture: React.PropTypes.bool,
    submitActive: React.PropTypes.bool,
    submit: React.PropTypes.func,
    title: React.PropTypes.string,
    pictureChange: React.PropTypes.func,
    imageCropChange: React.PropTypes.func
};
