Publicate/src/Editor.vala

using Adw;
using Gtk;

namespace Publicate {

    public class PpubEditor : Box {

        private Adw.HeaderBar header;
        private WindowTitle header_title;

        private Leaflet leaflet;

        private Ppub.Publication publication;
        private File publication_file;
        private ViewerWindow window;

        private FileExplorer file_explorer;
        private Box tab_box;
        private TabView tab_view;
        private TabBar tab_bar;

        private Button save_tab_button;

        private Gee.HashMap<string, Editors.EditorWidget> open_editors = new Gee.HashMap<string, Editors.EditorWidget>();

        public PpubEditor(ViewerWindow win) {
            window = win;

            orientation = Orientation.VERTICAL;
            header = new Adw.HeaderBar();
            append(header);

            header_title = new WindowTitle("Untitled Publication", "");
            header.title_widget = header_title;

            var file_box = new Box(Orientation.VERTICAL, 0);
            file_box.vexpand = true;
            file_explorer = new FileExplorer();
            file_explorer.asset_selected.connect(open_asset);
            file_explorer.vexpand = true;
            file_box.append(file_explorer);
            
            var file_buttons = new Box(Orientation.HORIZONTAL, 0);
            file_buttons.add_css_class("linked");
            file_buttons.halign = Align.END;
            file_buttons.margin_end = 8;
            file_buttons.margin_bottom = 8;
            file_buttons.margin_start = 8;
            file_buttons.margin_top = 8;
            file_box.append(file_buttons);
            
            var new_file_button = new Button.from_icon_name("document-new-symbolic");
            file_buttons.append(new_file_button);

            var add_file_button = new Button.from_icon_name("list-add-symbolic");
            file_buttons.append(add_file_button);

            var remove_file_button = new Button.from_icon_name("user-trash-symbolic");
            file_buttons.append(remove_file_button);
            
            leaflet = new Leaflet();
            leaflet.vexpand = true;
            leaflet.append(file_box);
            
            tab_view = new TabView();
            tab_bar = new TabBar();
            tab_box = new Box(Orientation.VERTICAL, 0);
            tab_bar.autohide = false;
            tab_bar.set_view(tab_view);
            tab_box.append(tab_bar);
            tab_box.append(tab_view);
            leaflet.append(tab_box);

            save_tab_button = new Button.from_icon_name("document-save-symbolic");
            save_tab_button.clicked.connect(save_tab);
            header.pack_end(save_tab_button);

            tab_view.notify["selected-page"].connect(() => select_file_from_tab());

            append(leaflet);
        }

        public async void load_ppub(File file) throws Error {

            publication = new Ppub.Publication(file.get_path());
            publication_file = file;

            header_title.title = publication.metadata.title ?? "Untitled PPUB";
            header_title.subtitle = publication.metadata.author_name ?? "";
            window.title = header_title.title + " - Publicate!";

            file_explorer.set_assets(publication.assets);

        }

        public async void open_asset(Ppub.Asset asset) {

            if(open_editors.has_key(asset.name)) {
                tab_view.selected_page = open_editors[asset.name].tab_page;
                return;
            }
            
            if(asset.mimetype == "text/markdown") {
                var editor = new Editors.MarkdownEditor(window, tab_view);
                add_editor(editor, asset);
            }
            else if(asset.mimetype.has_prefix("text/")) {
                var editor = new Editors.PlainTextEditor(window, tab_view);
                add_editor(editor, asset);
            }
            if(asset.mimetype == "application/x-ppub-metadata") {
                var editor = new Editors.MetadataEditor(window, tab_view);
                add_editor(editor, asset);
            }

        }

        private void add_editor(Editors.EditorWidget editor, Ppub.Asset asset) {
            editor.load_asset(publication, asset);
            open_editors.set(asset.name, editor);
            tab_view.selected_page = editor.tab_page;
        }

        private async void save(Invercargill.Enumerable<Savable> to_save) {

            var builder = new Ppub.Builder();
            foreach (var item in to_save) {
                item.save_asset(builder);
            }

            var temp_file = File.new_for_path(publication_file.get_path() + ".tmp");
            var stream = yield temp_file.replace_async(null, false, FileCreateFlags.REPLACE_DESTINATION, Priority.DEFAULT);

            builder.write(stream);
            yield stream.close_async(Priority.DEFAULT, null);
            
            yield temp_file.move_async(publication_file, FileCopyFlags.OVERWRITE, Priority.DEFAULT, null, null);
            yield load_ppub(publication_file);

            select_file_from_tab();
        }

        private async void save_tab() {
            var current_editor = (Editors.EditorWidget)tab_view.selected_page.child;
            var to_save = publication.assets.select<Savable>(a => a.name == current_editor.asset_name ? (Savable)current_editor : new SavableAsset(publication, a));
            yield save(to_save);
        }


        private void select_file_from_tab() {
            var editor = (Editors.EditorWidget)tab_view.selected_page.child;
            file_explorer.set_selected_item(editor.asset_name);
        }

        public async void add_asset (string name, string mimetype, GLib.InputStream stream, Ppub.CompressionInfo compression) {

            var to_save = publication.assets.select<Savable>(a => new SavableAsset(publication, a)).to_sequence();
            to_save.add(new SavableNewAsset(name, mimetype, stream, compression));
            yield save(to_save);
            
        }
    }
}