var password = null; // password, only stored temporary, until reload
var username = null; // username, only used during registration
var filecontent = new Array(); // temporary storage for attachments

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('error');
                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("offline");
        });
}

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) {
            error("offline", true);
            $("#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 clearmessage() {
    filecontent = new Array();
    $('#preview').empty();
    $("#msg").val("");
    notice("message cleared");
}

function attachments(files, id) {
    if (files) files.forEach(function(file) {
        if (file.content.length<1000000) {
            var img = document.createElement('img');
            img.src = 'data:'+file.type+';base64,' + file.content;
            $(id).append(img);
        }
    });
}

function fileupload(evt) {
    if (!window.FileReader)
        return error("your browser dows not support file upload", true);
    for (var i=0, f; f=evt.target.files[i]; ++i) {
        var file = f;
        var reader = new FileReader();
        reader.onload = function(evt) {
            if (evt.target.error) return error("error reading file", true);
            if (evt.target.readyState==0) return notice("waiting for data ...");
            if (evt.target.readyState==1) return notice("loading data ...");
            var base64 = btoa(evt.target.result);
            filecontent.push({type: file.type, content: base64});
            if (file.type.match('^image/')) {
                var img = document.createElement('img');
                img.src = 'data:'+file.type+';base64,' + base64;
                $("#preview").append(img);
                success('image of type '+file.type+' is ready to be sent');
            } else {
                success('file of type '+file.type+' is ready to be sent');
            }
        }
        reader.readAsBinaryString(file);
    }
}

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

var startmsg = 0; // number of last downloaded message
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) {
                                setTimeout(get, 10000);
                                return error("key of receiver not found", true);
                            }
                            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) {
                                    var message = JSON.parse(msg.text);
                                    $("#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">'+
                                                 message.text+
                                                 '</div></div><div class="clear"/>');
                                    attachments(message.files, '#id'+e.id+' .text');
                                    $('#id'+e.id).emoticonize();
                                    if (!beeped)
                                        (new Audio("A-Tone-His_Self-1266414414.mp3"))
                                        .play();
                                    beeped = true;
                                })
                                .catch(function(e) {
                                    // not for me
                                });
                        }).fail(function(e) {
                            error("offline", true);
                        });
                });
            }
        }).fail(function(e) {
            error("offline", true)
        });
    setTimeout(get, 10000);
}

function sendmessage(recv, txt) {
    notice("1/3 preparing message ...");
    $("#message").fadeOut("slow");
    $.post("pubkey.php", {user: recv})
        .done(function(pk) {
            var res=JSON.parse(pk);
            var key=openpgp.key.readArmored(res);
            if (!res||key.err) {
                $("#message").fadeIn("slow");
                error("key of receiver not found", true);
                return;
            }
            var privkey = privateKey().keys[0];
            privkey.decrypt(password);
            var message = JSON.stringify({text: txt, files: filecontent});
            notice("2/3 encrypting message ...");
            openpgp.signAndEncryptMessage(key.keys.concat(publicKey().keys), privkey, message)
                .then(function(msg) {
                    notice("3/3 sending message ...");
                    $.post("send.php", {user: userid(), msg: msg})
                        .done(function(res) {
                            var st = JSON.parse(res);
                            if (st.success) {
                                $("#message").fadeIn("slow");
                                clearmessage();
                                success(st.txt);
                            } else {
                                $("#message").fadeIn("slow");
                                error(st.txt, true);
                            }
                        })
                        .fail(function() {
                            error("offline", true);
                        });
                })
                .catch(function(e) {
                    $("#message").fadeIn("slow");
                    error("encryption of message failed", true);
                });
        })
        .fail(function(e) {
            $("#message").fadeIn("slow");
            error("offline", true);
        });
    $("#message").fadeIn("slow");
}

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(function() {
        error("offline")
    });
}

function login() {
    status("login ...");
    $.post("login.php", {user: userid(),
                         pubkey: localStorage.pubKey},
           function(res) {
               var st = JSON.parse(res);
               if (st.success) {
                   status("logged in ...", st.txt);
                   chat();
               } else {
                   error(st.txt);
               }
           })
        .fail(function(e) {
            error("offline");
        });
}

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

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

$(start);