// basic var initialisation
var project = app.project;
var comp = project.activeItem;
var currentLine;
var maskCounter = 0;
var layerMask;
var allStuff = new Array();
var exportArray = new Array();
var allVertices = new Array();
var allInTangents = new Array();
var allOutTangents = new Array();

var maskShape = new Shape();
var importShape = new Shape();

// UI
var mainWindow = new Window("palette", "Mask Importer/Exporter", undefined);
mainWindow.orientation = "column";

var groupOne = mainWindow.add("group", undefined, "groupOne");
groupOne.orientation = "row";
var importButton = groupOne.add("button", undefined, "Import Mask");
var exportButton = groupOne.add("button", undefined, "Export Mask");

mainWindow.center();
mainWindow.show();

// Importing mask information
importButton.onClick = function(){
    app.beginUndoGroup("Import Mask");
    var importFile = new File;
    importFile = importFile.openDlg("Choose Mask Text File", "Text File:*.txt");

    var fpath = importFile.absoluteURI;
    readDocument(importFile);

    var newComp = project.items.addComp("Import Mask", 1920, 1080, 1, 10, 30);
    newComp.openInViewer();
    var vParse;
    var vArray;
    var allVs = [];
    var allIs = [];
    var allOs = [];
    var iParse;
    var iArray;
    var oParse;
    var oArray;
    var importLayer = newComp.layers.addSolid([1, 1, 1], "Mask Layer", 1920, 1080, 1, 10);
    // generate and apply masks
    for(var e = 0; e < maskCounter; e++){
        vParse = allVertices[e].toString();
        vArray = vParse.split(",");
        while(vArray.length > 0){
            allVs.push(vArray.splice(0, 2));
            }
        //alert(allInTangents[e]);
        iParse = allInTangents[e].toString();
        iArray = iParse.split(",");
        while(iArray.length > 0){
            allIs.push(iArray.splice(0, 2));
            }
        oParse = allOutTangents[e].toString();
        oArray = oParse.split(",");
        while(oArray.length > 0){
            allOs.push(oArray.splice(0, 2));
            }

        importShape.vertices = allVs;
        importShape.inTangents = allIs;
        importShape.outTangents = allOs;

        layerMask = importLayer.Masks.addProperty("Mask");
        layerMask.property("ADBE Mask Shape").setValue(importShape);
        }
    app.endUndoGroup();
    alert("Import Successful");
    }


// exporint mask information
exportButton.onClick = function(){
    app.beginUndoGroup("Export Mask");

    var layer = comp.layer(1);
    var numMasks = layer.property("Masks").numProperties;
    for(var q = 1; q <= numMasks; q++){


    var myPath = layer.property("Masks").property("Mask " + q).property("Mask Path");

    var myVertices = layer.property("Masks").property("Mask " + q).property("Mask Path").value.vertices;
    var myInTangents = layer.property("Masks").property("Mask " + q).property("Mask Path").value.inTangents;
    var myOutTangents = layer.property("Masks").property("Mask " + q).property("Mask Path").value.outTangents;
    maskShape.vertices = myVertices;
    maskShape.inTangents = myInTangents;
    maskShape.outTangents = myOutTangents;

    var mainString = "mask " + q + "\r\n" + "vertices = " + maskShape.vertices.toString() + "\r\n" + "intangents = " + maskShape.inTangents.toString() + "\r\n" + "outtangents = " + maskShape.outTangents.toString() + "\r\n";
    exportArray.push(mainString);
    }

   exportArray = exportArray.join("\r\n");

    var myFile = new File("~/Desktop/mask.txt");
        myFile.open("w")
        myFile.encoding = "UTF-8";
        myFile.write(exportArray);
        myFile.close();

        app.endUndoGroup();
        alert("Export Successful");
    }

// reading, parsing, and storing info in text file
function readDocument(inputDoc){
        var thisDoc = new File(inputDoc);
        if(thisDoc.exists){
                thisDoc.open("r");
                while(!thisDoc.eof){
                        currentLine = thisDoc.readln();
                        allStuff.push(currentLine);
                    }
                thisDoc.close();
            }

        var thisLine;
        var equalsCharIndex;
        var tempLine;
            for(var i = 0; i < allStuff.length; i++){
                    thisLine = allStuff[i];
                    //alert(thisLine);
                    if(thisLine.match(/mask/g)){
                        maskCounter++;
                       // alert("mask");
                        }
                    if(thisLine.match(/vertices =/g)){
                        equalsCharIndex = thisLine.indexOf("=");
                        tempLine = thisLine.slice(equalsCharIndex + 1, thisLine.length);
                        allVertices.push(tempLine);
                        //alert("vertices")
                        }
                    if(thisLine.match(/intangents =/g)){
                        equalsCharIndex = thisLine.indexOf("=");
                        tempLine = thisLine.slice(equalsCharIndex + 1, thisLine.length);
                        allInTangents.push(tempLine);
                        //alert("hintangetns");
                        }
                    if(thisLine.match(/outtangents =/g)){
                        equalsCharIndex = thisLine.indexOf("=");
                        tempLine = thisLine.slice(equalsCharIndex + 1, thisLine.length);
                        allOutTangents.push(tempLine);
                        //alert("outtahere");
                        }
                }
    }