#target indesign;

export_to_pdf (app.books.item (get_book ()));

//============================================================

function export_to_pdf (book)
    {
    var data = select_items (book);
    chapters_to_pdf (data.chapters /*array of file objects*/, data.preset /*string*/);
    }


function chapters_to_pdf (chapters, preset)
    {
    var f;
    var p_list = progress_list (create_list (chapters), 'Exporting PDF...');
    for (var i = 0; i < chapters.length; i++)
        try
            {
            p_list[i].text = '+';
            app.open (chapters[i], false);
            f = new File (chapters[i].fullName.replace (/indd$/, 'pdf'));
            app.pdfExportPreferences.pageRange = PageRange.allPages;
            app.documents[0].exportFile (ExportFormat.pdfType, f, false, preset );
            app.documents[0].close (SaveOptions.no);
            }
        catch(_){};
    p_list[0].parent.parent.close ();
    }

    function first_page (doc)  {return String (doc.pages[0].name)}


function create_list (f)
    {
    var array = [];
    for (i = 0; i < f.length; i++)
        array.push (f[i].name);
    return array
    }


function select_items (book)
    {
    var array = [];
    var book_contents = book.bookContents.everyItem().fullName;
    for (var i = 0; i < book_contents.length; i++)
        array[i] = File (book_contents[i]).name;
    var history = 'pdf_individuals_history.txt';
    var presets = app.pdfExportPresets.everyItem().name;
    var w = new Window ('dialog', book.name + ': export chapters to PDF');
    w.alignChildren = ['left', 'top'];
    w.orientation = 'row';
    var g1 = w.add ('group');
        g1.alignChildren = 'fill';
        g1.minimumSize.width = 200;
        g1.orientation = 'column';
        var list = g1.add ('listbox', undefined, array, {multiselect: true});
        list.maximumSize.height = 700;
    var panel = g1.add ('panel');
        panel.orientation = 'row';
        panel.add ('statictext', undefined, 'PDF preset: ');
        var preset_list = panel.add ('dropdownlist', undefined, presets);
        preset_list.selection = array_pos (read_history (history), presets);
    var buttons = w.add ('group');
        buttons.orientation = 'column';
        var select_all = buttons.add ('button', undefined, 'Select all');
        var deselect_all = buttons.add ('button', undefined, 'Deselect all');
        var invert = buttons.add ('button', undefined, 'Invert selection');
        var ok = buttons.add ('button', undefined, 'OK', {name: 'ok'});
        var cancel = buttons.add ('button', undefined, 'Cancel', {name:'cancel'});
        select_all.preferredSize = deselect_all.preferredSize = [120,20];
        invert.preferredSize = ok.preferredSize = cancel.preferredSize = [120,20];
        
    select_all.onClick = function ()
        {
        var all_items = new Array();
        var L = list.items.length;
        for (var i = 0; i < L; i++)
            all_items[i] = list.items[i];
        list.selection = all_items;
        }
    
    // select all items on start-up
    select_all.notify();

    invert.onClick = function ()	
        {
        var selected_items = new Array();
        var L = list.items.length;
        for (var i = 0; i < L; i++)
            if (list.items[i].selected == false)
                selected_items.push (list.items[i]);
        list.selection = null;
        list.selection = selected_items;
        }
    
    deselect_all.onClick = function ()
        {
        list.selection = null;
        }

    if (w.show () == 1)
        {
        store_history (history, preset_list.selection.text);
        var selected_docs = get_selected (list, book_contents);
        w.close ();
        return {chapters: selected_docs, preset: preset_list.selection.text}
        }
    else
        {
        w.close ();
        exit();
        }
    }


function get_selected (selected_list, booklist)
    {
    var array = [];
    for (var i = 0; i < selected_list.items.length; i++)
        if (selected_list.items[i].selected)
            array.push (booklist[selected_list.items[i].index]);
    return array
    }


function array_pos (item, array)
    {
    for (var i = 0; i < array.length; i++)
        if (item == array[i])
            return i;
    return 0
    }


function read_history (s)
    {
    var temp = "";
    var f = File (script_dir() + s);
    if (f.exists)
        {
        f.open ('r');
        var temp = f.read ();
        f.close ();
        }
    return temp
    }


function store_history (s, picked)
    {
    var f = File (script_dir() + s);
    f.open ('w');
    f.write (picked);
    f.close ()
    }


function progress_bar (stop, title)
    {
    w___ = new Window ('palette', title);
    pb___ = w___.add ('progressbar', undefined, 0, stop);
    pb___.preferredSize = [300,20];
    w___.show()
    return pb___;
    }


function progress_list (array, title)
    {
    var txt = [];
    dlg___ = new Window ('palette', title);
    dlg___.orientation = 'row';
    var gr1 = dlg___.add ('group');
    gr1.orientation = 'column';
    gr1.alignChildren = ['left','top'];
    for (var i = 0; i < array.length; i++)
        {
        txt[i] = gr1.add ('statictext', undefined, '');
        txt[i].characters = 1
        }
    var gr2 = dlg___.add ('group');
    gr2.minimumSize.width = 200;
    gr2.orientation = 'column';
    gr2.alignChildren = ['left','top'];
    for (var i = 0; i < array.length; i++)
        gr2.add ('statictext', undefined, array[i]);
    dlg___.show();
    return txt;
    }


function script_dir()
    {
    try {return File (app.activeScript).path + '/'}
    catch (e) {return File (e.fileName).path + '/'}
    }


function errorM (m)
    {
    alert (m, 'Error', true);
    exit();
    }


function get_book ()
    {
    switch (app.books.length)
        {
        case 0: alert ("Please open a book."); exit ();
        case 1: return app.books[0].name;
        default: return pick_book ();
        }
    }


function pick_book ()
    {
    var w = new Window ("dialog", "Select a book");
    w.alignChildren = "right";
    var g = w.add ("group");
        var list = g.add ("listbox", undefined, app.books.everyItem().name);
        list.minimumSize.width = 250;
        list.selection = 0;
    var b = w.add ("group");
        b.add ("button", undefined, "OK", {name: "ok"})
        b.add ("button", undefined, "Cancel", {name: "cancel"})
    if (w.show () == 1)
        return list.selection.text;
    else
        exit ();
    }