<?php
session_start();
$mysqllogin = json_decode(file_get_contents("secrets/MysqlLogin.json"), false);

$mysqli = new mysqli('localhost', $mysqllogin->DBUser, $mysqllogin->DBPassword, $mysqllogin->DBName);

$action = $_POST["action"];

if($action == "login"){
    $uname = $_POST["username"];
    $pwd = $_POST["password"];
    $stmt1 = $mysqli->prepare("SELECT `Password, ID, FullName, Nickname, CanSeeFullNames, CanSeeOthersComments, IsAdmin FROM Users WHERE Username = %s;");
    $stmt1->bind_param('s', $uname);
    $stmt1->bind_result($pwdhash, $uid, $fullname, $nick, $fullnamepriv, $otherscommentspriv, $adminpriv);
    $stmt1->execute();
    $stmt1->store_result();
    if ($stmt1->num_rows > 0){
        while ($stmt1->fetch()){
            if(password_verify($pwd, $pwdhash)){
                $_SESSION["username"] = $uname;
                $_SESSION["loggedin"] = 1;
                $_SESSION["userID"]  = $uid;
                $_SESSION["fullname"] = $fullname;
                $_SESSION["nickname"] = $nick;
                $_SESSION["canseefullnames"] = $fullnamepriv;
                $_SESSION["canseeotherscomments"] = $otherscommentspriv;
                $_SESSION["isadmin"] = $adminpriv;
            }
        }
    }
    echo "Logged in";
    return;
}

if($action == "logout"){
    session_destroy();
    echo "Logged out";
    return;
}


function processUserRelated($actionin, mysqli $mysqliconn){

    if($actionin == "setnickname"){
        $newNick = $_POST["newnick"];
        $_SESSION["nickname"] = $newNick;
        $stmt2 = $mysqliconn->prepare("UPDATE Users SET Nickname=%s WHERE ID = %i;");
        $stmt2->bind_param('si', $newNick, $_SESSION["userID"]);
        $stmt2->execute();
        $stmt2->store_result();
    }

    if($actionin == "setfullname"){
        $newFull = $_POST["newFull"];
        $_SESSION["fullname"] = $newNick;
        $stmt3 = $mysqliconn->prepare("UPDATE Users SET FullName=%s WHERE ID = %i;");
        $stmt3->bind_param('si', $newFull, $_SESSION["userID"]);
        $stmt3->execute();
        $stmt3->store_result();
    }

    if($actionin == "setpassword"){
        $oldPWD = $_POST["oldPWD"];
        $newPWD = $_POST["newPWD"];
        $stmt4 = $mysqliconn->prepare("SELECT Password FROM Users WHERE ID = %i AND Username = %s;");
        $stmt4->bind_param('is', $_SESSION["userID"], $_SESSION["username"]);
        $stmt4->bind_result($pwdhash);
        $stmt4->execute();
        $stmt4->store_result();
        if ($stmt4->num_rows > 0){
            while ($stmt4->fetch()){
                if(password_verify($oldPWD, $pwdhash)){
                    $stmt5 = $mysqliconn->prepare("UPDATE Users SET Password=%s WHERE ID = %i;");
                    $newPWDhash = password_hash($newPWD, PASSWORD_DEFAULT);
                    $stmt5->bind_param('si', $newPWDhash, $_SESSION["userID"]);
                    $stmt5->execute();
                    $stmt5->store_result();
                    return "Password changed";
                }
            }
        }
    }

    if($actionin == "getallusers"){
        $stmt6 = $mysqliconn->prepare("SELECT Username, Nickname, FullName, IsAdmin FROM Users;");
        $stmt6->execute();
        $stmt6->bind_result($uname, $nick, $fnamex, $isadmin);
        $stmt6->store_result();
        $outarr = array();
        if ($stmt6->num_rows > 0){
            while ($stmt6->fetch()){
                if ($_SESSION["canseefullnames"] == 1){
                    $fname = $fnamex;
                }
                else{
                    $fname = "";
                }
                $tmparr["username"] = $uname;
                $tmparr["nickname"] = $nick;
                $tmparr["fullname"] = $fname;
                $tmparr["isadmin"] = $isadmin;
                array_push($outarr, $tmparr);
            }
        }
        return json_encode($outarr);
    }

    if($actionin == "adduser"){
        $stmt6 = $mysqliconn->prepare("INSERT INTO Users");
        $stmt6->execute();
        $stmt6->bind_result($uname, $nick, $fnamex, $isadmin);
        $stmt6->store_result();
        $outarr = array();
        if ($stmt6->num_rows > 0){
            while ($stmt6->fetch()){
                if ($_SESSION["canseefullnames"] == 1){
                    $fname = $fnamex;
                }
                else{
                    $fname = "";
                }
                $tmparr["username"] = $uname;
                $tmparr["nickname"] = $nick;
                $tmparr["fullname"] = $fname;
                $tmparr["isadmin"] = $isadmin;
                array_push($outarr, $tmparr);
            }
        }
        return json_encode($outarr);
    }

    return 0;
}


function processCitationRelated($actionin, mysqli $mysqliconn){
    
    if($actionin == "getcitations"){
        
    }

    if($actionin == "getrandomcitation"){
        
    }

    if($actionin == "getcitationfulltextsearch"){
        
    }

    if($actionin == "getcitationsbyuser"){
        
    }

    if($actionin == "getcitationsbysource"){
        
    }

    if($actionin == "getcitationsbytags"){
        
    }

    if($actionin == "getcitationbyverse"){
        
    }

    return 0;
}


function processTagsRelated($actionin, mysqli $mysqliconn){

    if($actionin == "createtag"){

    }

    if($actionin == "getalltags"){

    }

    if($actionin == "gettagsbycollection"){
        
    }

    return 0;
}

function processSourcesRelated($actionin, mysqli $mysqliconn){

    if($actionin == "createsource"){
        
    }

    if($actionin == "getallsources"){

    }

    if($actionin == "getallsourcesbycreator"){

    }

    return 0;
}

function processCommentRelated($actionin, mysqli $mysqliconn){

    if($actionin == "createcomment"){
        
    }

    if($actionin == "getallcommentsbycreator"){
        
    }

    if($actionin == "getcommentsbycitationlatestversion"){
        
    }

    if($actionin == "getcommentsbycitationallversions"){
        
    }

    return 0;
}

if($_SESSION["loggedin"] == 1){

    $citationreturn = processCitationRelated($action, $mysqli);
    if($citationreturn != 0){
        echo $citationreturn;
        return;
    }

    $commentreturn = processCommentRelated($action, $mysqli);
    if($commentreturn != 0){
        echo $commentreturn;
        return;
    }
    
    $tagsreturn = processTagsRelated($action, $mysqli);
    if($tagsreturn != 0){
        echo $tagsreturn;
        return;
    }

    $sourcereturn = processSourcesRelated($action, $mysqli);
    if($sourcereturn != 0){
        echo $sourcereturn;
        return;
    }

    $userreturn = processUserRelated($action, $mysqli);
    if($userreturn != 0){
        echo $userreturn;
        return;
    }
}
else{
    echo "Not logged in";
    return;
}


?>