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/* global Flash */
import sqljs from 'sql.js';
import { template as _template } from 'underscore';
const PREVIEW_TEMPLATE = _template(`
<div class="panel panel-default">
<div class="panel-heading"><%- name %></div>
<div class="panel-body">
<img class="img-thumbnail" src="data:image/png;base64,<%- image %>"/>
</div>
</div>
`);
class BalsamiqViewer {
constructor(viewer) {
this.viewer = viewer;
this.endpoint = this.viewer.dataset.endpoint;
}
loadFile() {
const xhr = new XMLHttpRequest();
xhr.open('GET', this.endpoint, true);
xhr.responseType = 'arraybuffer';
xhr.onload = this.renderFile.bind(this);
xhr.onerror = BalsamiqViewer.onError;
xhr.send();
}
renderFile(loadEvent) {
const container = document.createElement('ul');
this.initDatabase(loadEvent.target.response);
const previews = this.getPreviews();
previews.forEach((preview) => {
const renderedPreview = this.renderPreview(preview);
container.appendChild(renderedPreview);
});
container.classList.add('list-inline');
container.classList.add('previews');
this.viewer.appendChild(container);
}
initDatabase(data) {
const previewBinary = new Uint8Array(data);
this.database = new sqljs.Database(previewBinary);
}
getPreviews() {
const thumbnails = this.database.exec('SELECT * FROM thumbnails');
return thumbnails[0].values.map(BalsamiqViewer.parsePreview);
}
getResource(resourceID) {
const resources = this.database.exec(`SELECT * FROM resources WHERE id = '${resourceID}'`);
return resources[0];
}
renderPreview(preview) {
const previewElement = document.createElement('li');
previewElement.classList.add('preview');
previewElement.innerHTML = this.renderTemplate(preview);
return previewElement;
}
renderTemplate(preview) {
const resource = this.getResource(preview.resourceID);
const name = BalsamiqViewer.parseTitle(resource);
const image = preview.image;
const template = PREVIEW_TEMPLATE({
name,
image,
});
return template;
}
static parsePreview(preview) {
return JSON.parse(preview[1]);
}
/*
* resource = {
* columns: ['ID', 'BRANCHID', 'ATTRIBUTES', 'DATA'],
* values: [['id', 'branchId', 'attributes', 'data']],
* }
*
* 'attributes' being a JSON string containing the `name` property.
*/
static parseTitle(resource) {
return JSON.parse(resource.values[0][2]).name;
}
static onError() {
const flash = new Flash('Balsamiq file could not be loaded.');
return flash;
}
}
export default BalsamiqViewer;
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