var password = null;
var username = null;

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('<pre>'+JSON.stringify(data)+'</pre>');
                console.log("error: "+JSON.stringify(data));
            }
        } else {
            $("#status").html('error');
            console.log("error");
        }
        $("#status").fadeIn("slow");
        if (!stay) setTimeout(start, 5000);
    });
}

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");
    });
}

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");
    });
}

function status(text, msg) {
    $("#main").fadeOut("slow", function() {
        $("#main").html(text);
        success(msg);
        $("#main").fadeIn("slow", function() {
            $("form input:first-child").focus();
        })
    });
}

function checkuser(user) {
    $("#register").submit(function(event) {
        return false;
    });
    $.post("checknewuser.php", {user: user})
        .done(function(res) {
            username=JSON.parse(res);
            if (!username||username.length<1) username=null;
            $("#createuser").prop("disabled", !(username && password));
            if (username) {
                if (password) success("user is ready to be created");
                else notice("user name is available, please set password");
            } else notice("user name is not available");
        }).fail(function(res) {
            username=null;
            $("#createuser").prop("disabled", !(username && password));
            error(res);
        });
}

function checkpwd(pwd, pwd2) {
    $("#register").submit(function(event) {
        return false;
    });
    if (pwd==pwd2) password=pwd;
    else password=null;
    if (!password||password.length<1) password=null;
    $("#createuser").prop("disabled", !(username && password));
    if (password) {
        if (username) success("user is ready to be created");
        else notice("password matches, please chose a valid user name");
    } else notice("passwords don't match");
}

function checkpartner(user) {
    $("#chat").submit(function(event) {
        return false;
    });
    $.post("checknewuser.php", {user: user})
        .done(function(res) {
            if (JSON.parse(res)) {
                notice("receiver does not exist");
                $("#send").prop("disabled", true);
                return;
            }
            $("#send").prop("disabled", false);
            success("receiver exists");
        }).fail(function(res) {
            notice("cannot connect to server: "+res);
            $("#send").prop("disabled", true);
        });
}

function createNewUser(user, pwd) {
    status("generate keys");
    openpgp.generateKeyPair({
        numBits: 1024,
        userId: user,
        passphrase: pwd
    }).then(function(keyPair) {
        success("keys generated");
        localStorage.pubKey = keyPair.publicKeyArmored;
        localStorage.privKey = keyPair.privateKeyArmored;
        login();
    }).catch(function(e) {
        error(e);
    });
}

function publicKey() {
    if (typeof localStorage.pubKey == 'undefined') return null;
    return openpgp.key.readArmored(localStorage.pubKey);
}

function privateKey() {
    if (typeof localStorage.privKey == 'undefined') return null;
    return openpgp.key.readArmored(localStorage.privKey);
}

function userid() {
    if (!publicKey() ||
        publicKey().keys.length < 1 ||
        publicKey().keys[0].getUserIds().length < 1) return null
    return publicKey().keys[0].getUserIds()[0];
}

function fileupload(evt) {
    if (!window.FileReader)
        return error("your browser dows not support file upload", true);
    var reader = new FileReader();
    reader.onload = function(evt) {
        if (evt.target.readyState!=2)
            return notice("ReadyState="+evt.target.readyState);
        if (evt.target.error) return error("error reading file", true);
        filecontent = evt.target.result;
        success(filecontent);
    }
    reader.readAsText(evt.target.files[0]);
}

function setreceiver(name) {
    $("#recv").val(name);
    checkpartner(name);
    $("#msg").focus();
}

var startmsg = 0;
function get() {
    var beeped = false;
    $.post("get.php", {start: startmsg}).done(function(res) {
        var msgs = JSON.parse(res);
        if (msgs) {
            msgs.forEach(function(e) {
                if (startmsg<Number(e["id"])) startmsg = Number(e["id"]);
                $.post("pubkey.php", {user: e["user"]}).done(function(pk) {
                    var res=JSON.parse(pk);
                    var key=openpgp.key.readArmored(res);
                    if (!res||key.err) {
                        error("key of receiver not found", true);
                    } else {
                        var message = openpgp.message.readArmored(e["msg"]);
                        var privkey = privateKey().keys[0];
                        if (privkey.decrypt(password))
                            openpgp.decryptAndVerifyMessage(privkey, key.keys, message)
                            .then(function(msg) {
                                $("#msgs") // todo: check msg.signatures[0].valid
                                    .prepend('<div id="id'+(e["id"])+'" class="msg '+
                                             (e["user"]==userid()?"me":"other")+
                                             '"><div class="header">'+
                                             '<span class="date">'+
                                             (new Date(1000*Number(e["time"]))).toLocaleString()+
                                             '</span><span class="sender">'+
                                             '<a href="javascript:void(0)" onclick="setreceiver(this.innerHTML)">'+
                                             e["user"]+
                                             '</a></span></div><div class="text">'+
                                             msg.text+
                                             '</div></div><div class="clear"/>');
                                $('#id'+(e["id"])).emoticonize();
                                if (!beeped)
                                    (new Audio("A-Tone-His_Self-1266414414.mp3"))
                                    .play();
                                beeped = true;
                            });
//                            .catch(function(e) {
//                                error("decryption of message failed", true);
//                            });
                    }
                }).fail(function(e) {
                    error("get sender's key from server failed", true);
                });
            });
        }
        setTimeout(get, 10000);
    }).fail(error);
}

function sendmessage(recv, txt) {
    $.post("pubkey.php", {user: recv}).done(function(pk) {
        var res=JSON.parse(pk);
        var key=openpgp.key.readArmored(res);
        if (!res||key.err) {
            error("key of receiver not found", true);
            return;
        }
        var privkey = privateKey().keys[0];
        privkey.decrypt(password);
        openpgp.signAndEncryptMessage(key.keys.concat(publicKey().keys), privkey, txt)
        .then(function(msg) {
            $.post("send.php", {user: userid(), msg: msg})
                .done(function(res) {
                    if (JSON.parse(res)) {
                        $("#msg").val("");
                        success("message sent");
                    } else error("error sending message", true);
                })
                .fail(error);
        })
        .catch(function(e) {
            error("encryption of message failed", true);
        });
    }).fail(function(e) {
        error("get receiver's key from server failed", true);
    });
}

function setpw(pwd) {
    if (privateKey().keys[0].decrypt(pwd)) {
        password = pwd;
        chat();
    }
}

function getpwd() {
    status('<form>'+
           '    <input placeholder="password for '+userid()+
           '" id="pwd" oninput="setpw(this.value)" type="password" />'+
           '</form>');
}

function chat() {
    if (!password) return getpwd();
    $.ajax({url: "chat.html", success: function(res) {
        status(res);
        setTimeout(get, 2000);
    }}).fail(error);
}

function login() {
    status("login ...");
    $.post("login.php", {user: userid(),
                         pubkey: localStorage.pubKey},
           function(res) {
               if (JSON.parse(res)) {
                   status("logged in ...", "successfully logged in");
                   chat();
               } else {
                   error("login failed");
               }
           }).fail(function(e) {
               error(e);
           });
}

function newuser() {
    status("new user ...");
    $.ajax({url: "newuser.html", success: function(res) {
        status(res);
    }}).fail(error);
}

function start() {
    try {
        status("Starting up ...");
        if (!userid()) {
            newuser();
        } else {
            login();
        }
    } catch (m) {
        error(m);
    }
}

$(start);