using Gtk;
using Adw;
using GtkCommonMark;
using Invercargill;

namespace Publicate.Editors {

    public class MetadataEditor : Box, EditorWidget, Savable {

        private Ppub.Metadata metadata;
        private Ppub.Asset asset;
        private TabPage page;

        private EntryRow title;
        private EntryRow author;
        private EntryRow author_email;
        private FileChooserRow poster;
        private EntryRow description;
        private EntryRow tags;

        private FileChooserRow licence;
        private EntryRow copyright;

        private ViewerWindow window;

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


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

            var scroll_window = new ScrolledWindow ();
            scroll_window.hexpand = true;
            scroll_window.vexpand = true;
            var box = new Box(Orientation.VERTICAL, 0);
            scroll_window.child = box;
            append(scroll_window);


            var group = new PreferencesGroup();
            group.margin_bottom = 18;
            group.margin_end = 18;
            group.margin_start = 18;
            group.margin_top = 18;
            group.title = "Publication Details";
            group.description = "";

            title = new EntryRow ();
            title.title = "Title";
            title.changed.connect (something_changed);
            group.add(title);

            author = new EntryRow ();
            author.title = "Author";
            author.changed.connect (something_changed);
            group.add(author);

            author_email = new EntryRow ();
            author_email.title = "Author Email";
            author_email.changed.connect (something_changed);
            group.add(author_email);

            poster = new FileChooserRow (window);
            poster.title = "Poster Image";
            poster.asset_selected.connect (something_changed);
            group.add(poster);

            description = new EntryRow ();
            description.enable_emoji_completion = true;
            description.title = "Description";
            description.changed.connect (something_changed);
            group.add(description);

            tags = new EntryRow ();
            tags.title = "Tags (space separated)";
            tags.changed.connect (something_changed);
            group.add(tags);

            box.append(group);

            var group2 = new PreferencesGroup();
            group2.margin_bottom = 18;
            group2.margin_end = 18;
            group2.margin_start = 18;
            group2.margin_top = 18;
            group2.title = "Licence and Copyright";
            group2.description = "";

            copyright = new EntryRow ();
            copyright.title = "Copyright Notice";
            copyright.changed.connect (something_changed);
            group2.add(copyright);

            licence = new FileChooserRow (window);
            licence.title = "Licence";
            licence.asset_selected.connect (something_changed);
            group2.add(licence);

            box.append(group2);

            this.page = tab_view.add_page (this, null);
        }

        public async void load_asset (Ppub.Publication publication, Ppub.Asset asset) {
            this.asset = asset;

            var stream = publication.read_asset (asset.name);
            metadata = new Ppub.Metadata.from_stream (stream);

            poster.set_assets(publication.assets.where(a => a.mimetype.has_prefix ("image/")));
            licence.set_assets(publication.assets.where(a => a.mimetype.has_prefix ("text/")));

            title.text = metadata.title ?? "";
            author.text = metadata.author_name ?? "";
            author_email.text = metadata.author_email ?? "";
            poster.set_selected_item (metadata.poster ?? "");
            description.text = metadata.description ?? "";
            tags.text = ate(metadata.tags).to_string (a => a, " ");

            copyright.text = metadata.copyright ?? "";
            licence.set_selected_item (metadata.licence ?? "");

            set_changed(false);
        }

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

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

        private string? process_string(string str) {
            var stripped = str.chomp().chug();
            if(stripped == "") {
                return null;
            }
            return stripped;
        }

        public void save_asset (Ppub.Builder builder) {
            metadata.title = process_string(title.text);

            var email = author_email.text.chomp().chug();
            if(email != "") {
                metadata.author = @"$(author.text) <$email>";
            }
            else {
                metadata.author = process_string(author.text);
            }

            print(@"$(poster.selected_asset)\n");
            metadata.poster = process_string (poster.selected_asset);
            metadata.description = process_string(description.text);
            metadata.tags = tags.text.chug().chomp().split (" ");
            metadata.copyright = process_string(copyright.text);
            metadata.licence = process_string (licence.selected_asset);

            // TODO, this should probably done on every save globally?
            metadata.date = new DateTime.now_local();

            var stream = new MemoryInputStream.from_data((uint8[])metadata.to_string().to_utf8());
            var compression_info = new Ppub.CompressionInfo(stream);
            stream.seek(0, SeekType.SET);

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

        private void set_changed(bool changed) {
            this.page.title = changed ? "⏺  Publication Metadata" : "Publication Metadata";
            unsaved = changed;
        }

        private void something_changed() {
            set_changed(true);
        }
    }


}