#targetengine "session"

function main() {
    // Guard
    if (app.documents.length === 0) {
        alert("No open document.");
        return;
    }

    var doc = app.activeDocument;
    var objectStyleName = "mh";

    // ---- Helpers ----------------------------------------------------------

    // Find the Object Style named "mh" (searches through groups as well)
    function findObjectStyleByName(d, styleName) {
        function collect(root, out) {
            var i, g;
            for (i = 0; i < root.objectStyles.length; i++) out.push(root.objectStyles[i]);
            for (g = 0; g < root.objectStyleGroups.length; g++) collect(root.objectStyleGroups[g], out);
        }
        var all = [];
        collect(d, all);
        for (var s = 0; s < all.length; s++) {
            if (all[s].name === styleName) return all[s];
        }
        return null;
    }

    var objectStyle = findObjectStyleByName(doc, objectStyleName);
    if (!objectStyle) {
        alert("Object style '" + objectStyleName + "' not found.");
        return;
    }

    // Build a list of all text frames (to collect unique stories reliably)
    var allTextFrames = [];
    for (var i = 0; i < doc.textFrames.length; i++) {
        allTextFrames.push(doc.textFrames[i]);
    }

    // Collect unique parentStory objects
    var stories = [];
    for (var k = 0; k < allTextFrames.length; k++) {
        var st = allTextFrames[k].parentStory;
        var exists = false;
        for (var j = 0; j < stories.length; j++) {
            if (stories[j] === st) { exists = true; break; }
        }
        if (!exists) stories.push(st);
    }

    // ---- Main loop --------------------------------------------------------

    for (var s = 0; s < stories.length; s++) {
        var story = stories[s];
        var frames = story.textContainers;
        if (frames.length < 2) continue;

        for (var f = 0; f < frames.length - 1; f++) {
            var thisFrame = frames[f];
            var nextFrame = frames[f + 1];

            // First word in NEXT frame (avoid indexOf/trim; ExtendScript-safe)
            var nextText = nextFrame.contents;
            var firstWord = "";
            for (var c = 0; c < nextText.length; c++) {
                var ch = nextText.charAt(c);
                if (ch === " " || ch === "\r" || ch === "\n" || ch === "\t") { break; }
                firstWord += ch;
            }
            if (firstWord.length === 0) continue;

            // ===== Create and align the small inserted frame =====
            // Use SAME parent container (Page or Spread) to avoid origin mismatch
            var parentContainer = thisFrame.parent;
            if (!parentContainer) continue;

            // Dimensions of the small note frame
            var newW = 40;
            var newH = 15;

            // Align left edge to the **visible** left of the source (accounts for stroke)
            // and place it 1 pt below the **geometric** bottom
            var vb = thisFrame.visibleBounds;    // [y1, x1, y2, x2]
            var gb = thisFrame.geometricBounds;  // [y1, x1, y2, x2]
            var srcVisLeft = vb[1];
            var newY = gb[2] + 1;

            // Create with zero stroke first to avoid initial visual shift
            var insertedFrame = parentContainer.textFrames.add({
                geometricBounds: [newY, srcVisLeft, newY + newH, srcVisLeft + newW]
            });
            try { insertedFrame.strokeWeight = 0; } catch (_se) {}

            // Mirror rotation/shear if any
            try {
                insertedFrame.rotationAngle = thisFrame.rotationAngle;
                insertedFrame.shearAngle    = thisFrame.shearAngle;
            } catch (_tx) {}

            // Insert content
            var firstWordText = "First word in next textFrame is : " + "'" + firstWord + "'";
            insertedFrame.contents = firstWordText;

            // Apply the object style
            insertedFrame.appliedObjectStyle = objectStyle;

            // After style application, re-align visible left edge EXACTLY to source
            try {
                var visLeftNow = insertedFrame.visibleBounds[1]; // current visible left
                var dx = visLeftNow - srcVisLeft;
                if (dx !== 0) {
                    var b = insertedFrame.geometricBounds; // [y1, x1, y2, x2]
                    b[1] -= dx; // shift x1
                    b[3] -= dx; // shift x2
                    insertedFrame.geometricBounds = b;
                }
            } catch (_realignErr) {}
            // ===== end create/align =====
        }
    }
}

// Wrap for single undo step
app.doScript(
    main,
    ScriptLanguage.JAVASCRIPT,
    undefined,
    UndoModes.ENTIRE_SCRIPT,
    "Insert First Word from Next Text Frame - Style 'mh'"
);