/*! @file

    @id $Id$

    This is the main application as it is fully run in the user's browser.

*/
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var socket = io.connect();

function DockerContainers() {
    var Status = Object.freeze({
        Error:      "red",
        Terminated: "yellow",
        Restarting: "lightblue",
        Paused:     "lightgrey",
        Running:    "lightgreen"
    });
    var containers = [];
    var nodes = [];
    this.graph = function() {
        var res = "";
        console.log("nodes["+nodes.length+"]=", nodes);
        for (name in nodes) {
            var n = nodes[name];
            var label = n.name+'\\n'+n.image;
            res += '"'+n.name+'"'
                +' [label="'+label
                +'",URL="details('+"'"+n.name+"'"
                +')",style=filled,fillcolor='+n.status+"];\n";
        }
        res += "{rank=same;\n";
        for (name in nodes) {
            var n = nodes[name];
            n.volumes.forEach(function(v) {
                res += '"'+v.id+'" [label="'+v.inside+'",shape=box];\n';
            });
        }
        res+="}\n";
        res += "{rank=same;\n";
        for (name in nodes) {
            var n = nodes[name];
            n.volumes.forEach(function(v) {
                if (v.host)
                    res += '"'+v.outside+'" [label="'+v.host+'",shape=box];\n';
            });
        }
        res+="}\n";
        for (name in nodes) {
            var n = nodes[name];
            n.volumes.forEach(function(v) {
                if (v.host)
                    res += '"'+v.id+'" -> "'+v.outside+'"\n';
            });
        }
        for (name in nodes) {
            var n = nodes[name];
            n.volumes.forEach(function(v) {
                res += '"'+n.name+'" -> "'+v.id+'"\n';
            });
        }
        return res;
    }
    function setup() {
        delete nodes; nodes=[];
        containers.forEach(function(c) {
            var name = c.Name.replace(/^\//, "");
            nodes[name] = {};
            console.log("container: "+name);
            nodes[name].name = name;
            nodes[name].image = c.Config.Image;
            nodes[name].ports = [];
            var ports = c.NetworkSettings.Ports || c.NetworkSettings.PortBindings;
            if (ports)
                for (var port in ports)
                    if (ports[port])
                        for (var expose in ports[port]) {
                            var ip = ports[port][expose].HostIp;
                            if (ip==""||ip=="127.0.0.1"||ip=="0.0.0.0") ip=null;
                            nodes[name].ports.push({
                                internal: port,
                                external: ports[port][expose].HostPort,
                                ip: ip
                            });
                        }
            if (c.State.Running) nodes[name].status = Status.Running;
            else if (c.State.Paused) nodes[name].status = Status.Paused;
            else if (c.State.Restarting) nodes[name].status = Status.Restarting;
            else if (c.State.ExitCode == 0) nodes[name].status = Status.Terminated;
            else nodes[name].status = Status.Error;
            nodes[name].volumes = [];
            var volumes = c.Volumes || c.Config.Volumes;
            nodes[name].volumes = [];
            if (volumes)
                for (var volume in volumes) {
                    var outside = (typeof volumes[volume]=="string")?volumes[volume]:null;
                    nodes[name].volumes.push({
                        id: volume+':'+(outside?outside:name),
                        inside: volume,
                        outside: outside,
                        host: outside && !outside.match(/^\/var\/lib\/docker/)
                            ? volumes[volume] : null
                    });
                }
            nodes[name].volumesfrom = c.VolumesFrom;
            nodes[name].links = [];
            if (c.HostConfig && c.HostConfig.Links)
                c.HostConfig.Links.forEach(function(l) {
                    nodes[name].links.push({
                        to:   l.replace(/^\/?([^:]*).*$/, "$1"),
                        link: l.replace(new RegExp("^.*:/?"+name+"/"), "")
                    });
                });
            console.log(nodes[name]);
        });
    }
    this.setContainers = function(c) {
        if (typeof c == "string") c = JSON.parse(c);
        if (typeof c != "object") throw "wrong format: "+(typeof c);
        containers = c;
        setup();
    }
}

var dc = new DockerContainers();

/// Show error messsage
/** Fades in an error message and logs to console.
    @param data (optional) The error can be a string or any structure.
                Strings are shown to the user, structures are logged only.
    @param stay (optional) If not given as @c true, reloads page after 5s. */
function error(data, stay) {
    $("#status").fadeOut("slow", function() {
        $("#status").addClass("error")
        $("#status").removeClass("notice")
        $("#status").removeClass("success")
        if (data) {
            if (typeof data == 'string') {
                $("#status").html(data);
                console.log("error: "+data);
            } else {
                $("#status").html('unknown error: '+JSON.stringify(data));
                console.log("error: "+JSON.stringify(data));
            }
        } else {
            $("#status").html('error');
            console.log("error");
        }
        $("#status").fadeIn("slow");
        if (!stay) setTimeout(start, 5000);
    });
}

/// Show notice messsage
/** Fades in an notice message and logs to console.
    @param text (optional) The data is a string. */
function notice(text) {
    $("#status").fadeOut("slow", function() {
        $("#status").addClass("notice")
        $("#status").removeClass("error")
        $("#status").removeClass("success")
        if (text) {
            $("#status").html(text);
            console.log("notice: "+text);
        } else {
            $("#status").html('');
            console.log("notice");
        }
        $("#status").fadeIn("slow");
    });
}

/// Show notice messsage
/** Fades in an success message and logs to console.
    @param text (optional) The data is a string. */
function success(text) {
    $("#status").fadeOut("slow", function() {
        $("#status").addClass("success")
        $("#status").removeClass("error")
        $("#status").removeClass("notice")
        if (text) {
            $("#status").html(text);
            console.log("success: "+text);
        } else {
            $("#status").html('');
            console.log("success");
        }
        $("#status").fadeIn("slow");
    });
}

/// Show status message in the main screen area
/** @param text Text is a message or some complex HTML from the server.
    @param msg The success message text */
function status(text, msg) {
    $("#main").fadeOut("slow", function() {
        $("#main").html(text);
        if (msg) success(msg);
        else setTimeout("$('#status').fadeOut('slow')", 5000);
        $("#main").fadeIn("slow", function() {
            $("form input:first-child").focus();
        })
    });
}

function emit(signal, data) {
    console.log("<-snd "+signal);
    socket.emit(signal, data);
}

function connected() {
    console.log("server connected");
    $("#connectionstatus #bad").hide();
    $("#connectionstatus #good").show();
    success("server connected");
}

function disconnected() {
    console.log("server disconnected");
    $("#connectionstatus #good").hide();
    $("#connectionstatus #bad").show();
    error("server disconnected", true);
}

function connectionstatus() {
    if (socket.connected) connected(); else disconnected();
}

/// Toggle Menu Display
function togglemenu() {
    $("#menu").toggle();
}

function about(c) {
    $("#imagetools").hide();
    $.ajax({url: "about.php", success: function(res) {
        try {
            var a = JSON.parse(res);
            status("<h2>"+a.description+"</h2>"+
                   "<p>"+a.project+"-"+a.version+"</p>"+
                   "<p>"+a.docker+"</p>"+
                   "<h3>README</h3>"+
                   "<pre>"+a.readme+"</pre>");
        } catch(e) {
            status("<pre>"+res+"</pre>");
            error("Exception Caught: "+e);
        }
    }}).fail(function() {
        error("offline");
    });
}

var zoomlevel = 0;
function zoom(incr = 0) {
    zoomlevel = (zoomlevel+incr)%2;
    switch (zoomlevel) {
        case 0: {
            $("#main svg").css("width", "auto");
            $("#main svg").css("height", "auto");
            $("#main svg").css("max-width", "100%");
            $("#main svg").css("max-height", "100%");
        } break;
        case 1: {
            $("#main svg").css("width", "100%");
            $("#main svg").css("height", "auto");
            $("#main svg").css("max-width", "100%");
            $("#main svg").css("max-height", "none");
        } break;
        case 2: {
            $("#main.svg").css("width", "auto");
            $("#main.svg").css("height", "100%");
            $("#main.svg").css("max-width", "none");
            $("#main.svg").css("max-height", "100%");
        } break;
    }
}

var viz = null;
var rankdir = "LR";
function rotateviz() {
    if (!viz) return;
    if (rankdir == "LR")
        rankdir = "TB";
    else
        rankdir = "LR";
    showviz(viz);
}
function showviz(vizpath) {
    $("#imagetools").show();
    viz = vizpath;
    console.log("DRAW: "+viz);
    res = "digraph {\n"+"  rankdir="+rankdir+";\n"+viz+"\n}";
    try {
        zoomlevel = 0;
        status(Viz(res));
    } catch(e) {
        (res = res.split("\n")).forEach(function(v, i, a) {
            a[i] = ("000"+(i+1)).slice(-3)+": "+v;
        });
        status("<h2>Exception Caught:</h2><p>"+e+"<p><pre>"+res.join("\n")+"</pre>");
    }
}

function details(c) {
    $("#imagetools").hide();
    $.ajax({url: "details.php?container="+c, success: function(res) {
        try {
            status(res);
        } catch(e) {
            status("<pre>"+res+"</pre>");
            error("Exception Caught: "+e);
        }
    }}).fail(function() {
        error("offline");
    });
}

function action(container, action) {
    $("#imagetools").hide();
    $.ajax({url: "action.php?container="+container+"&action="+action, success: function(res) {
        success(res);
        manage();
    }}).fail(function() {
        error("offline");
    });
}

/** Manage Docker Services */
function manage() {
    $("#imagetools").hide();
    $.ajax({url: "manage.php", success: function(res) {
        status(res);
    }}).fail(function() {
        error("offline");
    });
}

/** Show an Overview of all Docker Services */
function overview() {
    $("#imagetools").hide();
}

/** Show an Overview of all Docker Images */
function imgs() {
    $("#imagetools").hide();
    $.ajax({url: "images.php", success: function(res) {
        try {
            showviz(res);
        } catch(e) {
            (res = res.split("\n")).forEach(function(v, i, a) {
                a[i] = ("000"+(i+1)).slice(-3)+": "+v;
            });
            status("<h2>Exception Caught:</h2><p>"+e+"<p><pre>"+res.join("\n")+"</pre>");
        }
    }}).fail(function() {
        error("offline");
    });
}

function containers(c) {
    console.log("->rcv containers");
    dc.setContainers(c);
    showviz(dc.graph());
}

/// Initial Function: Startup
/** Decide whether to login or to create a new user */
function start() {
    $("#imagetools").hide();
    $("#menu").hide();
    $("#username").html(window.location.hostname)
    try {
        status("Starting up ...");
        emit("containers");
    } catch (m) {
        error(m);
    }
}

function init() {
    socket.io.on("connect", connected);
    socket.io.on("reconnect", connected);
    socket.io.on("disconnect", disconnected);
    socket.io.on("error", disconnected);
    socket.on("containers", containers);
    start();
}

/// On Load, Call @ref start
/*
 $(window.onbeforeunload = function() {
    return "Are you sure you want to navigate away?";
});
 */
$(init);