/*
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You 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.
*/

// Sometimes we don't need ponymail.js, so let's redefine GetAsync here
function GetAsync(theUrl, xstate, callback) {
    var xmlHttp = null;
    if (window.XMLHttpRequest) {
        xmlHttp = new XMLHttpRequest();
    } else {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (pm_config.URLBase && pm_config.URLBase.length > 0) {
        theUrl = pm_config.URLBase + theUrl
        theUrl = theUrl.replace(/\/+/g, "/")
    }
    xmlHttp.open("GET", theUrl, true);
    xmlHttp.send(null);
    xmlHttp.onreadystatechange = function(state) {
        if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
            if (callback) {
                try {
                    callback(JSON.parse(xmlHttp.responseText), xstate);
                } catch (e) {
                    callback(JSON.parse(xmlHttp.responseText), xstate)
                }
            }

        }
        if (xmlHttp.readyState == 4 && xmlHttp.status == 404) {
            alert("404'ed: " + theUrl)
        } else if (xmlHttp.readyState >= 4 && xmlHttp.status >= 400) {
            popup("Internal Server Error", "Sorry, the request failed. The server responded with: <pre>" + xmlHttp.responseText + "</pre>", 20)
        }
    }
}

// redirect to the oauth provider
function oauthPortal(key) {
    var ot = pm_config.oauth[key]
    var state = parseInt(Math.random()*1000000000) + '' + parseInt(Math.random()*1000000000)
    // google is different (as usual)
    if (key == 'google') {
        location.href = ot.oauth_portal + "?state=" + state + "&client_id=" + (ot.client_id ? ot.client_id : "") + "&response_type=code&scope=email+profile&redirect_uri=" + escape(window.location)
    } else {
        var cid = ""
        if (ot.construct) {
            for (var k in ot) {
                cid += "&" + k + "=" + escape(ot[k])
            }
        }
        location.href = ot.oauth_portal + "?state=" + state + "&redirect_uri=" + escape(window.location + "?key=" + key + "&state=" + state) + cid
    }
}

// Callback for oauth response from backend. if okay, send user back to front
// page.
function parseOauthResponse(json) {
    var wloc = "./"
    // always clear up the storage
    if (window.sessionStorage.getItem("ponymail_redirect_oauth")) {
        wloc = window.sessionStorage.getItem("ponymail_redirect_oauth")
        window.sessionStorage.removeItem("ponymail_redirect_oauth")
    }
    if (json.okay) {
        // if wloc tries to redirect to oauth.html, rewrite that to the front page instead
        if (wloc.match(/oauth.html/)) {
            wloc = "./"
        }
        location.href = wloc
    } else {
        popup("Oauth failed", "Authentication failed: " + json.msg, null, 10, wloc)
    }
}


// Func for rendering all available oauth options
function oauthOptions() {
    // get the oauth div
    var oobj = document.getElementById('oauthtypes') 
    oobj.innerHTML = ""
    // For each enabled oauth plugin, list it.
    for (var key in pm_config.oauth) {
        var ot = pm_config.oauth[key]
        if (true) { // dunno why this is here, but whatever.
            var img = document.createElement('img')
            img.setAttribute("src", "images/oauth_" + key + ".png")
            img.setAttribute("title", "Log on with " + ot.name)
            img.setAttribute("onclick", "oauthPortal('" + key + "');")
            img.style.cursor = "pointer"
            oobj.appendChild(img)
            oobj.appendChild(document.createElement('br'))
            oobj.appendChild(document.createTextNode(' '))
            oobj.appendChild(document.createElement('br'))
        }
    }
}

// onLoad function for oauth. If args (query string or bookmark) are supplied,
// we pass that on to the backend, otherwise show which oauth options are
// enabled.
// invoked by onload in oauth.html
function oauthWelcome(args) {
    // google auth sometimes uses bookmarks instead of passing the code as a
    // query string arg.
    if (!args || args.length == 0) {
        args = window.location.hash.substring(1)
    }
    // Is this a callback from an oauth provider? If so, run the oauth stuff
    if (args && args.length >= 40) {
        var key = args.match(/key=([a-z]+)/i)
        if (key) {
            key = key[1]
        }
        if (args.match(/code=/) && !key) {
            key = 'google'
        }
        if (key && key.length > 0 && pm_config.oauth[key]) {
            document.getElementById('oauthtypes').innerHTML = "Logging you in, hang on..!"
            var extra = "&key=" + key
            if (pm_config.oauth[key].oauth_url) {
                extra += "&oauth_token=" + pm_config.oauth[key].oauth_url
            }
            GetAsync("/api/oauth.lua?" + args + extra, {}, parseOauthResponse)
        } else {
            alert("Key missing or invalid! " + key)
        }
    // Not a callback, let's just show which oauth options are enabled.
    } else {
        window.sessionStorage.setItem("ponymail_redirect_oauth", document.referrer)
        oauthOptions()
    }
}