/**
* @fileoverview Script Compiler / Decompiler / Runner
* @author Ylian Saint-Hilaire
* @copyright Intel Corporation 2018
* @license Apache-2.0
* @version v0.1.0e
*/

module.exports.CreateAmtScriptEngine = function () {
    var o = {};

    // Core functions
    script_functionTable1 = ['nop', 'jump', 'set', 'print', 'dialog', 'getitem', 'substr', 'indexof', 'split', 'join', 'length', 'jsonparse', 'jsonstr', 'add', 'substract', 'parseint', 'wsbatchenum', 'wsput', 'wscreate', 'wsdelete', 'wsexec', 'scriptspeed', 'wssubscribe', 'wsunsubscribe', 'readchar', 'signwithdummyca'];

    // functions of type ARG1 = func(ARG2, ARG3, ARG4, ARG5, ARG6)
    script_functionTable2 = ['encodeuri', 'decodeuri', 'passwordcheck', 'atob', 'btoa', 'hex2str', 'str2hex', 'random', 'md5', 'maketoarray', 'readshort', 'readshortx', 'readint', 'readsint', 'readintx', 'shorttostr', 'shorttostrx', 'inttostr', 'inttostrx'];

    // functions of type ARG1 = func(ARG2, ARG3, ARG4, ARG5, ARG6)
    //script_functionTableX2 = [encodeURI, decodeURI, passwordcheck, window.atob.bind(window), window.btoa.bind(window), hex2rstr, rstr2hex, random, rstr_md5, MakeToArray, ReadShort, ReadShortX, ReadInt, ReadSInt, ReadIntX, ShortToStr, ShortToStrX, IntToStr, IntToStrX];

    // Optional functions of type ARG1 = func(ARG2, ARG3, ARG4, ARG5, ARG6)
    script_functionTable3 = ['pullsystemstatus', 'pulleventlog', 'pullauditlog', 'pullcertificates', 'pullwatchdog', 'pullsystemdefense', 'pullhardware', 'pulluserinfo', 'pullremoteaccess', 'highlightblock', 'disconnect', 'getsidstring', 'getsidbytearray'];

    /*
    // Optional functions of type ARG1 = func(ARG2, ARG3, ARG4, ARG5, ARG6)
    script_functionTableX3 = [
        PullSystemStatus
        ,
        // ###BEGIN###{EventLog}
        PullEventLog
        // ###END###{EventLog}
        ,
        // ###BEGIN###{AuditLog}
        PullAuditLog
        // ###END###{AuditLog}
        ,
        // ###BEGIN###{Certificates}
        PullCertificates
        // ###END###{Certificates}
        ,
        // ###BEGIN###{AgentPresence}
        PullWatchdog
        // ###END###{AgentPresence}
        ,
        // ###BEGIN###{SystemDefense}
        PullSystemDefense
        // ###END###{SystemDefense}
        ,
        // ###BEGIN###{HardwareInfo}
        PullHardware
        // ###END###{HardwareInfo}
        ,
        PullUserInfo
        ,
        // ###BEGIN###{RemoteAccess}
        PullRemoteAccess
        // ###END###{RemoteAccess}
        ,
        // ###BEGIN###{Scripting-Editor}
        script_HighlightBlock
        // ###END###{Scripting-Editor}
        ,
        // ###BEGIN###{ComputerSelector}
        disconnect
        // ###END###{ComputerSelector}
        ,
        function (runner, x) { return GetSidString(x); }
        ,
        function (runner, x) { return GetSidByteArray(x); }
    ];

    // Setup the script state
    o.script_setup = function(binary, startvars) {
        var obj = { startvars: startvars };
        if (binary.length < 6) { console.error('Invalid script length'); return null; } // Script must have at least 6 byte header
        if (ReadInt(binary, 0) != 0x247D2945) { console.error('Invalid binary script'); return null; } // Check the script magic header
        if (ReadShort(binary, 4) > 1) { console.error('Unsupported script version'); return null; } // Check the script version
        obj.script = binary.substring(6);
        // obj.onStep;
        // obj.onConsole;

        // Reset the script to the start
        obj.reset = function (stepspeed) {
            obj.stop();
            obj.ip = 0;
            obj.variables = startvars;
            obj.state = 1;
        }

        // Start the script
        obj.start = function (stepspeed) {
            obj.stop();
            obj.stepspeed = stepspeed;
            if (stepspeed > 0) { obj.timer = setInterval(function () { obj.step() }, stepspeed); }
        }

        // Stop the script
        obj.stop = function () {
            if (obj.timer != null) { clearInterval(obj.timer); }
            obj.timer = null;
            obj.stepspeed = 0;
        }

        // function used to load and store variable values
        obj.getVar = function (name) { if (name == undefined) return undefined; return obj.getVarEx(name.split('.'), obj.variables); }
        obj.getVarEx = function (name, val) { try { if (name == undefined) return undefined; if (name.length == 0) return val; return obj.getVarEx(name.slice(1), val[name[0]]); } catch (e) { return null; } }
        obj.setVar = function (name, val) { obj.setVarEx(name.split('.'), obj.variables, val); }
        obj.setVarEx = function (name, vars, val) { if (name.length == 1) { vars[name[0]] = val; } else { obj.setVarEx(name.slice(1), vars[name[0]], val); } }

        // Run the script one step forward
        obj.step = function () {
            if (obj.state != 1) return;
            if (obj.ip < obj.script.length) {
                var cmdid = ReadShort(obj.script, obj.ip);
                var cmdlen = ReadShort(obj.script, obj.ip + 2);
                var argcount = ReadShort(obj.script, obj.ip + 4);
                var argptr = obj.ip + 6;
                var args = [];

                // Clear all temp variables (This is optional)
                for (var i in obj.variables) { if (i.startsWith('__')) { delete obj.variables[i]; } }

                // Loop on each argument, moving forward by the argument length each time
                for (var i = 0; i < argcount; i++) {
                    var arglen = ReadShort(obj.script, argptr);
                    var argval = obj.script.substring(argptr + 2, argptr + 2 + arglen);
                    var argtyp = argval.charCodeAt(0);
                    argval = argval.substring(1);
                    if (argtyp < 2) {
                        // Get the value and replace all {var} with variable values
                        while (argval.split("{").length > 1) { var t = argval.split("{").pop().split("}").shift(); argval = argval.replace('{' + t + '}', obj.getVar(t)); }
                        if (argtyp == 1) { obj.variables['__' + i] = decodeURI(argval); argval = '__' + i; } // If argtyp is 1, this is a literal. Store in temp variable.
                        args.push(argval);
                    }
                    if (argtyp == 2 || argtyp == 3) {
                        obj.variables['__' + i] = ReadSInt(argval, 0);
                        args.push('__' + i);
                    }
                    argptr += (2 + arglen);
                }

                // Move instruction pointer forward by command size
                obj.ip += cmdlen;

                // Get all variable values
                var argsval = [];
                for (var i = 0; i < 10; i++) { argsval.push(obj.getVar(args[i])); }
                var storeInArg0;

                try {
                    if (cmdid < 10000) {
                        // Lets run the actual command
                        switch (cmdid) {
                            case 0: // nop
                                break;
                            case 1: // jump(label) or jump(label, a, compare, b)
                                if (argsval[2]) {
                                    if (
                                        (argsval[2] == '<' && argsval[1] < argsval[3]) ||
                                        (argsval[2] == '<=' && argsval[1] <= argsval[3]) ||
                                        (argsval[2] == '!=' && argsval[1] != argsval[3]) ||
                                        (argsval[2] == '=' && argsval[1] == argsval[3]) ||
                                        (argsval[2] == '>=' && argsval[1] >= argsval[3]) ||
                                        (argsval[2] == '>' && argsval[1] > argsval[3])
                                    ) { obj.ip = argsval[0]; }
                                } else {
                                    obj.ip = argsval[0]; // Set the instruction pointer to the new location in the script
                                }
                                break;
                            case 2: // set(variable, value)
                                if (args[1] == undefined) delete obj.variables[args[0]]; else obj.setVar(args[0], argsval[1]);
                                break;
                            case 3: // print(message)
                                if (obj.onConsole) { obj.onConsole(obj.toString(argsval[0]), obj); } else { console.log(obj.toString(argsval[0])); }
                                //  Q(obj.consoleid).value += () + '\n'); Q(obj.console).scrollTop = Q(obj.console).scrollHeight;
                                break;
                            case 4: // dialog(title, content, buttons)
                                obj.state = 2;
                                obj.dialog = true;
                                setDialogMode(11, argsval[0], argsval[2], obj.xxStepDialogOk, argsval[1], obj);
                                break;
                            case 5: // getitem(a, b, c)
                                for (var i in argsval[1]) { if (argsval[1][i][argsval[2]] == argsval[3]) { storeInArg0 = i; } };
                                break;
                            case 6: // substr(variable_dest, variable_src, index, len)
                                storeInArg0 = argsval[1].substr(argsval[2], argsval[3]);
                                break;
                            case 7: // indexOf(variable_dest, variable_src, index, len)
                                storeInArg0 = argsval[1].indexOf(argsval[2]);
                                break;
                            case 8: // split(variable_dest, variable_src, separator)
                                storeInArg0 = argsval[1].split(argsval[2]);
                                break;
                            case 9: // join(variable_dest, variable_src, separator)
                                storeInArg0 = argsval[1].join(argsval[2]);
                                break;
                            case 10: // length(variable_dest, variable_src)
                                storeInArg0 = argsval[1].length;
                                break;
                            case 11: // jsonparse(variable_dest, json)
                                storeInArg0 = JSON.parse(argsval[1]);
                                break;
                            case 12: // jsonstr(variable_dest, variable_src)
                                storeInArg0 = JSON.stringify(argsval[1]);
                                break;
                            case 13: // add(variable_dest, variable_src, value)
                                storeInArg0 = (argsval[1] + argsval[2]);
                                break;
                            case 14: // substract(variable_dest, variable_src, value)
                                storeInArg0 = (argsval[1] - argsval[2]);
                                break;
                            case 15: // parseInt(variable_dest, variable_src)
                                storeInArg0 = parseInt(argsval[1]);
                                break;
                            case 16: // wsbatchenum(name, objectList)
                                obj.state = 2;
                                obj.amtstack.BatchEnum(argsval[0], argsval[1], obj.xxWsmanReturn, obj);
                                break;
                            case 17: // wsput(name, args)
                                obj.state = 2;
                                obj.amtstack.Put(argsval[0], argsval[1], obj.xxWsmanReturn, obj);
                                break;
                            case 18: // wscreate(name, args)
                                obj.state = 2;
                                obj.amtstack.Create(argsval[0], argsval[1], obj.xxWsmanReturn, obj);
                                break;
                            case 19: // wsdelete(name, args)
                                obj.state = 2;
                                obj.amtstack.Delete(argsval[0], argsval[1], obj.xxWsmanReturn, obj);
                                break;
                            case 20: // wsexec(name, method, args, selectors)
                                obj.state = 2;
                                obj.amtstack.Exec(argsval[0], argsval[1], argsval[2], obj.xxWsmanReturn, obj, 0, argsval[3]);
                                break;
                            case 21: // Script Speed
                                obj.stepspeed = argsval[0];
                                if (obj.timer != null) { clearInterval(obj.timer); obj.timer = setInterval(function () { obj.step() }, obj.stepspeed); }
                                break;
                            case 22: // wssubscribe(name, delivery, url, selectors, opaque, user, pass)
                                obj.state = 2;
                                obj.amtstack.Subscribe(argsval[0], argsval[1], argsval[2], obj.xxWsmanReturn, obj, 0, argsval[3], argsval[4], argsval[5], argsval[6]);
                                break;
                            case 23: // wsunsubscribe(name, selectors)
                                obj.state = 2;
                                obj.amtstack.UnSubscribe(argsval[0], obj.xxWsmanReturn, obj, 0, argsval[1]);
                                break;
                            case 24: // readchar(str, pos)
                                console.log(argsval[1], argsval[2], argsval[1].charCodeAt(argsval[2]));
                                storeInArg0 = argsval[1].charCodeAt(argsval[2]);
                                break;
                            case 25: // signWithDummyCa
                                // ###BEGIN###{Certificates}
                                obj.state = 2;
                                // DERKey, xxCaPrivateKey, certattributes, issuerattributes
                                amtcert_signWithCaKey(argsval[0], null, argsval[1], { 'CN': 'Untrusted Root Certificate' }, obj.xxSignWithDummyCaReturn);
                                // ###END###{Certificates}
                                break;
                            default: {
                                obj.state = 9;
                                console.error("Script Error, unknown command: " + cmdid);
                            }
                        }
                    } else {
                        if (cmdid < 20000) {
                            // functions of type ARG1 = func(ARG2, ARG3, ARG4, ARG5, ARG6)
                            storeInArg0 = script_functionTableX2[cmdid - 10000](argsval[1], argsval[2], argsval[3], argsval[4], argsval[5], argsval[6]);
                        } else {
                            // Optional functions of type ARG1 = func(ARG2, ARG3, ARG4, ARG5, ARG6)
                            if (script_functionTableX3 && script_functionTableX3[cmdid - 20000]) {
                                storeInArg0 = script_functionTableX3[cmdid - 20000](obj, argsval[1], argsval[2], argsval[3], argsval[4], argsval[5], argsval[6]); // Note that optional calls start with "obj" as first argument.
                            }
                        }
                    }

                    if (storeInArg0 != undefined) obj.setVar(args[0], storeInArg0);
                } catch (e) {
                    if (typeof e == 'object') { e = e.message; }
                    obj.setVar('_exception', e);
                }
            }

            if (obj.state == 1 && obj.ip >= obj.script.length) { obj.state = 0; obj.stop(); }
            if (obj.onStep) obj.onStep(obj);
            return obj;
        }

        obj.xxStepDialogOk = function (button) {
            obj.variables['DialogSelect'] = button;
            obj.state = 1;
            obj.dialog = false;
            if (obj.onStep) obj.onStep(obj);
        }

        // ###BEGIN###{**ClosureAdvancedMode}
        obj.xxWsmanReturnFix = function (x) {
            if (!x || x == null) return;
            if (x.Header) { x['Header'] = x.Header; delete x.Header; }
            if (x.Body) { x['Body'] = x.Body; delete x.Body; }
            if (x.Responses) { x['Responses'] = x.Responses; delete x.Responses; }
            if (x.Response) { x['Response'] = x.Response; delete x.Response; }
            if (x.ReturnValueStr) { x['ReturnValueStr'] = x.ReturnValueStr; delete x.ReturnValueStr; }
        }
        // ###END###{**ClosureAdvancedMode}

        obj.xxWsmanReturn = function (stack, name, responses, status) {
            // ###BEGIN###{**ClosureAdvancedMode}
            // This is required when Google Closure is used
            if (responses) {
                obj.xxWsmanReturnFix(responses);
                for (var i in responses) {
                    obj.xxWsmanReturnFix(responses[i]);
                    for (var j in responses[i]) { obj.xxWsmanReturnFix(responses[i][j]); }
                }
            }
            // ###END###{**ClosureAdvancedMode}
            obj.setVar(name, responses);
            obj.setVar('wsman_result', status);
            obj.setVar('wsman_result_str', ((httpErrorTable[status]) ? (httpErrorTable[status]) : ('Error #' + status)));
            obj.state = 1;
            if (obj.onStep) obj.onStep(obj);
        }

        // ###BEGIN###{Certificates}
        obj.xxSignWithDummyCaReturn = function (cert) {
            obj.setVar('signed_cert', btoa(_arrayBufferToString(cert)));
            obj.state = 1;
            if (obj.onStep) obj.onStep(obj);
        }
        // ###END###{Certificates}

        obj.toString = function (x) { if (typeof x == 'object') return JSON.stringify(x); return x; }

        obj.reset();
        return obj;
    }
    */

    ReadShort = function (v, p) { return (v.charCodeAt(p) << 8) + v.charCodeAt(p + 1); }
    ReadShortX = function (v, p) { return (v.charCodeAt(p + 1) << 8) + v.charCodeAt(p); }
    ReadInt = function (v, p) { return (v.charCodeAt(p) * 0x1000000) + (v.charCodeAt(p + 1) << 16) + (v.charCodeAt(p + 2) << 8) + v.charCodeAt(p + 3); } // We use "*0x1000000" instead of "<<24" because the shift converts the number to signed int32.
    ReadIntX = function (v, p) { return (v.charCodeAt(p + 3) * 0x1000000) + (v.charCodeAt(p + 2) << 16) + (v.charCodeAt(p + 1) << 8) + v.charCodeAt(p); }
    ShortToStr = function (v) { return String.fromCharCode((v >> 8) & 0xFF, v & 0xFF); }
    ShortToStrX = function (v) { return String.fromCharCode(v & 0xFF, (v >> 8) & 0xFF); }
    IntToStr = function (v) { return String.fromCharCode((v >> 24) & 0xFF, (v >> 16) & 0xFF, (v >> 8) & 0xFF, v & 0xFF); }
    IntToStrX = function (v) { return String.fromCharCode(v & 0xFF, (v >> 8) & 0xFF, (v >> 16) & 0xFF, (v >> 24) & 0xFF); }

    // Argument types: 0 = Variable, 1 = String, 2 = Integer, 3 = Label
    o.script_compile = function(script, onmsg) {
        var r = '', scriptlines = script.split('\n'), labels = {}, labelswap = [], swaps = [];
        // Go thru each script line and encode it
        for (var i in scriptlines) {
            var scriptline = scriptlines[i];
            if (scriptline.startsWith('##SWAP ')) { var x = scriptline.split(' '); if (x.length == 3) { swaps[x[1]] = x[2]; } } // Add a swap instance
            if (scriptline[0] == '#' || scriptline.length == 0) continue; // Skip comments & blank lines
            for (var x in swaps) { scriptline = scriptline.split(x).join(swaps[x]); } // Apply all swaps
            var keywords = scriptline.match(/"[^"]*"|[^\s"]+/g);
            if ((keywords == null) || (keywords.length == 0)) continue; // Skip blank lines
            if (scriptline[0] == ':') { labels[keywords[0].toUpperCase()] = r.length; continue; } // Mark a label position
            var funcIndex = script_functionTable1.indexOf(keywords[0].toLowerCase());
            if (funcIndex == -1) { funcIndex = script_functionTable2.indexOf(keywords[0].toLowerCase()); if (funcIndex >= 0) funcIndex += 10000; }
            if (funcIndex == -1) { funcIndex = script_functionTable3.indexOf(keywords[0].toLowerCase()); if (funcIndex >= 0) funcIndex += 20000; } // Optional methods
            if (funcIndex == -1) { if (onmsg) { onmsg("Unabled to compile, unknown command: " + keywords[0]); } return ''; }
            // Encode CommandId, CmdSize, ArgCount, Arg1Len, Arg1, Arg2Len, Arg2...
            var cmd = ShortToStr(keywords.length - 1);
            for (var j in keywords) {
                if (j == 0) continue;
                if (keywords[j][0] == ':') {
                    labelswap.push([keywords[j], r.length + cmd.length + 7]); // Add a label swap
                    cmd += ShortToStr(5) + String.fromCharCode(3) + IntToStr(0xFFFFFFFF); // Put an empty label
                } else {
                    var argint = parseInt(keywords[j]);
                    if (argint == keywords[j]) {
                        cmd += ShortToStr(5) + String.fromCharCode(2) + IntToStr(argint);
                    } else {
                        if (keywords[j][0] == '"' && keywords[j][keywords[j].length - 1] == '"') {
                            cmd += ShortToStr(keywords[j].length - 1) + String.fromCharCode(1) + keywords[j].substring(1, keywords[j].length - 1);
                        } else {
                            cmd += ShortToStr(keywords[j].length + 1) + String.fromCharCode(0) + keywords[j];
                        }
                    }
                }
            }
            cmd = ShortToStr(funcIndex) + ShortToStr(cmd.length + 4) + cmd;
            r += cmd;
        }
        // Perform all the needed label swaps
        for (i in labelswap) {
            var label = labelswap[i][0].toUpperCase(), position = labelswap[i][1], target = labels[label];
            if (target == undefined) { if (onmsg) { onmsg("Unabled to compile, unknown label: " + label); } return ''; }
            r = r.substr(0, position) + IntToStr(target) + r.substr(position + 4);
        }
        return IntToStr(0x247D2945) + ShortToStr(1) + r;
    }

    // Decompile the script, intended for debugging only
    o.script_decompile = function(binary, onecmd) {
        var r = '', ptr = 6, labelcount = 0, labels = {};
        if (onecmd >= 0) {
            ptr = onecmd; // If we are decompiling just one command, set the ptr to that command.
        } else {
            if (binary.length < 6) { return '# Invalid script length'; }
            var magic = ReadInt(binary, 0);
            var version = ReadShort(binary, 4);
            if (magic != 0x247D2945) { return '# Invalid binary script: ' + magic; }
            if (version != 1) { return '# Invalid script version'; }
        }
        // Loop on each command, moving forward by the command length each time.
        while (ptr < binary.length) {
            var cmdid = ReadShort(binary, ptr);
            var cmdlen = ReadShort(binary, ptr + 2);
            var argcount = ReadShort(binary, ptr + 4);
            var argptr = ptr + 6;
            var argstr = '';
            if (!(onecmd >= 0)) r += ":label" + (ptr - 6) + "\n";
            // Loop on each argument, moving forward by the argument length each time
            for (var i = 0; i < argcount; i++) {
                var arglen = ReadShort(binary, argptr);
                var argval = binary.substring(argptr + 2, argptr + 2 + arglen);
                var argtyp = argval.charCodeAt(0);
                if (argtyp == 0) { argstr += ' ' + argval.substring(1); } // Variable
                else if (argtyp == 1) { argstr += ' \"' + argval.substring(1) + '\"'; } // String
                else if (argtyp == 2) { argstr += ' ' + ReadInt(argval, 1); } // Integer
                else if (argtyp == 3) { // Label
                    var target = ReadInt(argval, 1);
                    var label = labels[target];
                    if (!label) { label = ":label" + target; labels[label] = target; }
                    argstr += ' ' + label;
                }
                argptr += (2 + arglen);
            }
            // Go in the script function table to decode the function
            if (cmdid < 10000) {
                r += script_functionTable1[cmdid] + argstr + "\n";
            } else {
                if (cmdid >= 20000) {
                    r += script_functionTable3[cmdid - 20000] + argstr + "\n"; // Optional methods
                } else {
                    r += script_functionTable2[cmdid - 10000] + argstr + "\n";
                }
            }
            ptr += cmdlen;
            if (onecmd >= 0) return r; // If we are decompiling just one command, exit now
        }
        // Remove all unused labels
        var scriptlines = r.split('\n');
        r = '';
        for (var i in scriptlines) {
            var line = scriptlines[i];
            if (line[0] != ':') { r += line + '\n'; } else { if (labels[line]) { r += line + '\n'; } }
        }
        return r;
    }

    // Convert the list of blocks into a script that can be compiled
    o.script_blocksToScript = function (script_BuildingBlocks, script_BlockScript) {
        var script = '';
        if (script_BuildingBlocks) {
            if (script_BuildingBlocks['_start']) { script += '##### Starting Block #####\r\n' + script_BuildingBlocks['_start']['code'] + '\r\n\r\n'; }
            for (var i in script_BlockScript) {
                var code = script_BlockScript[i]['code'];
                code = code.split("%%%~%%%").join(i);
                for (var j in script_BlockScript[i]['vars']) { code = code.split("%%%" + j + "%%%").join(script_BlockScript[i]['vars'][j]['value']); }
                script += '##### Block: ' + script_BlockScript[i]['name'] + ' #####\r\nHighlightBlock __t ' + i + '\r\n' + code + '\r\n\r\n';
            }
            if (script_BuildingBlocks['_end']) { script += '##### Ending Block #####\r\n' + script_BuildingBlocks['_end']['code'] + '\r\nHighlightBlock\r\n'; }
        }
        return script;
    }

    return o;
}