using Gtk;
using Adw;
using GtkCommonMark;

namespace Publicate.Editors {

    public class PlainTextEditor : Box, EditorWidget, Savable {

        private TextView text_view;
        
        private ScrolledWindow scroller;

        private ViewerWindow window;
        private TabPage page;

        public Adw.TabPage tab_page { get {
            return page;
        } }

        public string asset_name { get{
            return asset.name;
        } }

        private bool unsaved = false;
        public bool has_unsaved_changes { get{
            return unsaved;
        } }


        private Ppub.Asset asset;

        public PlainTextEditor(ViewerWindow win, TabView tab_view) {
            window = win;

            orientation = Orientation.VERTICAL;
            scroller = new ScrolledWindow ();

            text_view = new TextView();
            text_view.monospace = true;
            text_view.hexpand = true;
            text_view.set_wrap_mode (WrapMode.WORD_CHAR);
            text_view.top_margin = 18;
            text_view.bottom_margin = 18;
            text_view.left_margin = 18;
            text_view.right_margin = 18;
            text_view.buffer.changed.connect (text_changed);
            

            scroller.set_policy (PolicyType.NEVER, PolicyType.AUTOMATIC);
            scroller.vexpand = true;

            scroller.child = text_view;

            append(scroller);

            page = tab_view.add_page (this, null);
        }
        
        public async void load_asset (Ppub.Publication publication, Ppub.Asset asset) {
            this.asset = asset;

            text_view.buffer.set_text("", 0);
            MemoryOutputStream os = new MemoryOutputStream (null, GLib.realloc, GLib.free);
            yield os.splice_async (publication.read_asset (asset.name), OutputStreamSpliceFlags.CLOSE_SOURCE | OutputStreamSpliceFlags.CLOSE_TARGET);
            var text = os.steal_data ();
            text.length = (int) os.get_data_size ();

            text_view.buffer.set_text ((string)text, text.length);
            set_tab_name(false);
        }

        public override void save_asset(Ppub.Builder builder) {
            var article_data = get_text().to_utf8();
            var article_stream = new MemoryInputStream.from_data((uint8[])article_data);
            var compression_info = new Ppub.CompressionInfo(article_stream);
            article_stream.seek(0, SeekType.SET);

            builder.add_asset(asset.name, asset.mimetype, article_stream, Invercargill.empty<string>(), compression_info);
            set_tab_name(false);
        }

        private void text_changed() {
            set_tab_name(true);
        }

        public string get_text() {
            TextIter start_iter;
            TextIter end_iter;
            text_view.buffer.get_start_iter (out start_iter);
            text_view.buffer.get_end_iter (out end_iter);

            var text = text_view.buffer.get_text (start_iter, end_iter, true);
            return text;
        }

        private void set_tab_name(bool unsaved) {
            if(unsaved) {
                tab_page.title = @"⏺  $(asset.name)";
            }
            else {
                tab_page.title = asset.name;
            }
            this.unsaved = unsaved;
        }

        
    }
}