const Endless = imports.gi.Endless;
const GLib = imports.gi.GLib;
const Gtk = imports.gi.Gtk;
const WebKit = imports.gi.WebKit;

const EOS_URI_SCHEME = 'endless://';


const Application = new Lang.Class({
    Name: 'WebApplication',
    Extends: Endless.Application,

//  Set of actions that may be invoked from a WebView.
//  Declare them as function(dict), and use links with the format
//  "endless://actionName?parameter=value"

    _webActions: { },

    // This callback does the translation from URI to action
    // webview.connect('navigation-policy-decision-requested',
    //     Lang.bind(this, this.web_actions_handler));

    web_actions_handler: function(webview, frame, request, action, policy_decision) {
        let uri = request.get_uri();

        if(uri.indexOf(EOS_URI_SCHEME) !== 0) {
            // this is a regular URL, just navigate there
            return false;
        }

        // get the name and parameters for the desired function
        let f_call = uri.substring(EOS_URI_SCHEME.length, uri.length).split('?');
        var function_name = f_call[0];
        var parameters = {};

        if(f_call[1]) {
            // there are parameters
            let params = f_call[1].split('&');
            params.forEach(function(entry) {
                let param = entry.split('=');

                if(param.length == 2) {
                    param[0] = decodeURIComponent(param[0]);
                    param[1] = decodeURIComponent(param[1]);
                    // and now we add it...
                    parameters[param[0]] = param[1];
                }
            });
        }

        if(this._webActions[function_name])
            Lang.bind(this, this._webActions[function_name])(parameters);
        else
            throw new Error("Undefined WebHelper action '%s'. Did you add it " +
                "to your app's _webActions object?".format(function_name));

        policy_decision.ignore();
        return true;
    },

//  convenience functions

    _getElementById: function(webview, id) {
        // WebKit.DOMDocument
        let dom = webview.get_dom_document();

        // WebKit.DOMElement
        return dom.get_element_by_id(id);
    },

    translate_html: function(webview) {
        let dom = webview.get_dom_document();

        // WebKit.DOMNodeList
        let translatable = dom.get_elements_by_name('translatable');

        for (var i = 0 ; i < translatable.get_length() ; i++) {
            // WebKit.DOMNode
            let element = translatable.item(i);

            // Translate the text
            if(typeof this._translationFunction !== 'function')
                throw new Error("No suitable translation function was found. " +
                    "Did you forget to set '_translationFunction' on your app?");
            element.inner_html = this._translationFunction(element.inner_text);
        }
    }
});