#target illustrator

if (app.documents.length === 0) {
    alert("No document open");
    exit();
}

var doc = app.activeDocument;

// ================= UI =================
var win = new Window("dialog", "CTP Optimizer v3 – Mixed Calculation");
win.alignChildren = "fill";

// Sheet
var pSheet = win.add("panel", undefined, "Sheet Size");
pSheet.add("statictext", undefined, "Format: 11x14 in | 28x35 cm | 450x320 mm");
var sheetInput = pSheet.add("edittext", undefined, "11x14 in");
sheetInput.characters = 20;

// Margin
var pMargin = win.add("panel", undefined, "Margins (mm)");
pMargin.orientation = "grid";
pMargin.add("statictext", undefined, "Left");
var mL = pMargin.add("edittext", undefined, "10");
pMargin.add("statictext", undefined, "Right");
var mR = pMargin.add("edittext", undefined, "10");
pMargin.add("statictext", undefined, "Top");
var mT = pMargin.add("edittext", undefined, "10");
pMargin.add("statictext", undefined, "Bottom");
var mB = pMargin.add("edittext", undefined, "10");

// Gap
var pGap = win.add("panel", undefined, "Gap");
pGap.orientation = "row";
pGap.add("statictext", undefined, "Gap between items (mm):");
var gapInput = pGap.add("edittext", undefined, "5");

// Quantity
var pQty = win.add("panel", undefined, "Mixed Quantity (Size-Qty)");
var qtyInput = pQty.add("edittext", undefined,
"S-1\nM-2\nL-2\nXL-1", {multiline:true});
qtyInput.preferredSize.height = 100;

// Result
var pRes = win.add("panel", undefined, "Result");
var resTxt = pRes.add("edittext", undefined, "", {
    multiline:true,
    readonly:true
});
resTxt.preferredSize.height = 220;

// Buttons
var btns = win.add("group");
var calcBtn = btns.add("button", undefined, "Calculate");
var copyBtn = btns.add("button", undefined, "Copy");
var pdfBtn  = btns.add("button", undefined, "Export PDF");
btns.add("button", undefined, "Close", {name:"cancel"});

// ================= FUNCTIONS =================
function parseSheet(str) {
    var unit = "in";
    if (/mm/i.test(str)) unit = "mm";
    if (/cm/i.test(str)) unit = "cm";

    var n = str.match(/([\d\.]+)\s*x\s*([\d\.]+)/i);
    if (!n) return null;

    var w = parseFloat(n[1]);
    var h = parseFloat(n[2]);

    if (unit === "mm") { w *= 2.8346; h *= 2.8346; }
    else if (unit === "cm") { w *= 28.346; h *= 28.346; }
    else { w *= 72; h *= 72; }

    return {w:w, h:h};
}

function buildMix(qtyMap, capacity) {
    var sheets = [];
    while (true) {
        var sheet = {};
        var filled = 0;

        for (var k in qtyMap) {
            while (qtyMap[k] > 0 && filled < capacity) {
                sheet[k] = (sheet[k] || 0) + 1;
                qtyMap[k]--;
                filled++;
            }
        }

        if (filled === 0) break;
        sheets.push(sheet);
    }
    return sheets;
}

// ================= LOGIC =================
calcBtn.onClick = function () {

    if (doc.selection.length === 0) {
        alert("Please select one design object");
        return;
    }

    var sheet = parseSheet(sheetInput.text);
    if (!sheet) {
        alert("Invalid sheet format");
        return;
    }

    var gap = parseFloat(gapInput.text) * 2.8346;
    var ml = parseFloat(mL.text) * 2.8346;
    var mr = parseFloat(mR.text) * 2.8346;
    var mt = parseFloat(mT.text) * 2.8346;
    var mb = parseFloat(mB.text) * 2.8346;

    var usableW = sheet.w - ml - mr;
    var usableH = sheet.h - mt - mb;

    var b = doc.selection[0].visibleBounds;
    var dW = b[2] - b[0];
    var dH = b[1] - b[3];

    var col = Math.floor((usableW + gap) / (dW + gap));
    var row = Math.floor((usableH + gap) / (dH + gap));
    var capacity = col * row;

    if (capacity <= 0) {
        alert("Design too large for sheet");
        return;
    }

    var lines = qtyInput.text.split("\n");
    var qtyMap = {};
    var totalQty = 0;

    for (var i=0;i<lines.length;i++) {
        if (!lines[i]) continue;
        var p = lines[i].split("-");
        if (p.length !== 2) continue;
        var k = p[0];
        var q = parseInt(p[1],10);
        qtyMap[k] = q;
        totalQty += q;
    }

    var sheets = buildMix(JSON.parse(JSON.stringify(qtyMap)), capacity);

    var out = "";
    out += "Sheet Size      : " + sheetInput.text + "\n";
    out += "Sheet Capacity  : " + capacity + " pcs\n\n";

    for (var s=0; s<sheets.length; s++) {
        out += "Sheet " + (s+1) + ": ";
        var line = [];
        for (var k in sheets[s]) {
            line.push(k + "-" + sheets[s][k]);
        }
        out += line.join(" | ") + "\n";
    }

    out += "\nTotal Sheets : " + sheets.length;
    out += "\nTotal Qty    : " + totalQty;
    out += "\nWaste        : " + ((sheets.length*capacity) - totalQty);

    resTxt.text = out;
};

// ================= COPY =================
copyBtn.onClick = function () {
    if (!resTxt.text) return;
    app.clipboard = resTxt.text;
    alert("Result copied to clipboard");
};

// ================= PDF EXPORT =================
pdfBtn.onClick = function () {

    if (!resTxt.text) return;

    var rpt = app.documents.add(DocumentColorSpace.CMYK, 595, 842);
    var tf = rpt.textFrames.add();
    tf.contents = resTxt.text;
    tf.left = 40;
    tf.top = 800;
    tf.width = 520;
    tf.height = 760;

    var f = File.saveDialog("Save CTP Report PDF");
    if (!f) return;

    var opt = new PDFSaveOptions();
    rpt.saveAs(f, opt);
    rpt.close(SaveOptions.DONOTSAVECHANGES);
};

win.center();
win.show();