/*
Copyright 2015, 2016 OpenMarket Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

'use strict';

var React = require('react');

var MatrixClientPeg = require('matrix-react-sdk/lib/MatrixClientPeg');

var DateUtils = require('matrix-react-sdk/lib/DateUtils');
var filesize = require('filesize');

module.exports = React.createClass({
    displayName: 'ImageView',

    propTypes: {
        src: React.PropTypes.string.isRequired, // the source of the image being displayed
        name: React.PropTypes.string, // the main title ('name') for the image
        link: React.PropTypes.string, // the link (if any) applied to the name of the image
        width: React.PropTypes.number, // width of the image src in pixels
        height: React.PropTypes.number, // height of the image src in pixels
        fileSize: React.PropTypes.number, // size of the image src in bytes
        onFinished: React.PropTypes.func.isRequired, // callback when the lightbox is dismissed

        // the event (if any) that the Image is displaying. Used for event-specific stuff like
        // redactions, senders, timestamps etc.  Other descriptors are taken from the explicit
        // properties above, which let us use lightboxes to display images which aren't associated
        // with events.
        mxEvent: React.PropTypes.object,
    },

    // XXX: keyboard shortcuts for managing dialogs should be done by the modal
    // dialog base class somehow, surely...
    componentDidMount: function() {
        document.addEventListener("keydown", this.onKeyDown);
    },

    componentWillUnmount: function() {
        document.removeEventListener("keydown", this.onKeyDown);
    },

    onKeyDown: function(ev) {
        if (ev.keyCode == 27) { // escape
            ev.stopPropagation();
            ev.preventDefault();
            this.props.onFinished();
        }
    },

    onRedactClick: function() {
        var self = this;
        MatrixClientPeg.get().redactEvent(
            this.props.mxEvent.getRoomId(), this.props.mxEvent.getId()
        ).done(function() {
            if (self.props.onFinished) self.props.onFinished();
        }, function(e) {
            var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
            // display error message stating you couldn't delete this.
            var code = e.errcode || e.statusCode;
            Modal.createDialog(ErrorDialog, {
                title: "Error",
                description: "You cannot delete this image. (" + code + ")"
            });
        });
    },

    getName: function () {
        var name = this.props.name;
        if (name && this.props.link) {
            name = <a href={ this.props.link } target="_blank" rel="noopener">{ name }</a>;
        }
        return name;
    },

    render: function() {

/*
        // In theory max-width: 80%, max-height: 80% on the CSS should work
        // but in practice, it doesn't, so do it manually:

        var width = this.props.width || 500;
        var height = this.props.height || 500;

        var maxWidth = document.documentElement.clientWidth * 0.8;
        var maxHeight = document.documentElement.clientHeight * 0.8;

        var widthFrac = width / maxWidth;
        var heightFrac = height / maxHeight;

        var displayWidth;
        var displayHeight;
        if (widthFrac > heightFrac) {
            displayWidth = Math.min(width, maxWidth);
            displayHeight = (displayWidth / width) * height;
        } else {
            displayHeight = Math.min(height, maxHeight);
            displayWidth = (displayHeight / height) * width;
        }

        var style = {
            width: displayWidth,
            height: displayHeight
        };
*/
        var style, res;

        if (this.props.width && this.props.height) {
            style = {
                width: this.props.width,
                height: this.props.height,
            };
            res = style.width + "x" + style.height + "px";
        }

        var size;
        if (this.props.fileSize) {
            size = filesize(this.props.fileSize);
        }

        var size_res;
        if (size && res) {
            size_res = size + ", " + res;
        }
        else {
            size_res = size || res;
        }

        var showEventMeta = !!this.props.mxEvent;

        var eventMeta;
        if(showEventMeta) {
            eventMeta = (<div className="mx_ImageView_metadata">
                Uploaded on { DateUtils.formatDate(new Date(this.props.mxEvent.getTs())) } by { this.props.mxEvent.getSender() }
            </div>);
        }

        var eventRedact;
        if(showEventMeta) {
            eventRedact = (<div className="mx_ImageView_button" onClick={this.onRedactClick}>
                Redact
            </div>);
        }

        return (
            <div className="mx_ImageView">
                <div className="mx_ImageView_lhs">
                </div>
                <div className="mx_ImageView_content">
                    <img src={this.props.src} style={style}/>
                    <div className="mx_ImageView_labelWrapper">
                        <div className="mx_ImageView_label">
                            <img className="mx_ImageView_cancel" src="img/cancel-white.svg" width="18" height="18" alt="Close" onClick={ this.props.onFinished }/>
                            <div className="mx_ImageView_shim">
                            </div>
                            <div className="mx_ImageView_name">
                                { this.getName() }
                            </div>
                            { eventMeta }
                            <a className="mx_ImageView_link" href={ this.props.src } target="_blank" rel="noopener">
                                <div className="mx_ImageView_download">
                                        Download this file<br/>
                                         <span className="mx_ImageView_size">{ size_res }</span>
                                </div>
                            </a>
                            { eventRedact }
                            <div className="mx_ImageView_shim">
                            </div>
                        </div>
                    </div>
                </div>
                <div className="mx_ImageView_rhs">
                </div>
            </div>
        );
    }
});