use gtk;
use gtk::prelude::*;

use super::manager;
use super::vim_plug;
use super::store::Store;

pub struct Ui<'a> {
    manager: &'a manager::Manager,
}

impl<'a> Ui<'a> {
    pub fn new(manager: &'a manager::Manager) -> Ui<'a> {
        Ui { manager }
    }

    pub fn show<T: IsA<gtk::Window>>(&self, parent: &T) {
        const OK_ID: i32 = 0;

        let dlg = gtk::Dialog::new_with_buttons(
            Some("Plug"),
            Some(parent),
            gtk::DialogFlags::empty(),
            &[("Ok", OK_ID)],
        );

        dlg.set_default_size(800, 600);
        let content = dlg.get_content_area();
        let tabs = gtk::Notebook::new();

        let vim_plug_state = self.get_state();
        match vim_plug_state {
            vim_plug::State::AlreadyLoaded => {
                let get_plugins = gtk::Box::new(gtk::Orientation::Vertical, 3);
                let warn_lbl = gtk::Label::new(None);
                warn_lbl.set_markup("<span foreground=\"red\">Note:</span> <b>vim-plug</b> manager already loaded!\n\
                                               NeovimGtk plugins manager will be <b>disabled</b>.\n\
                                               To enable it please disable vim-plug in your configuration.\n\
                                               NeovimGtk manages plugins use vim-plug as backend.\n\
                                               You can convert vim-plug configuration to NeovimGtk configuration using button below.\n\
                                               List of current vim-plug plugins can be found in 'Plugins' tab.");
                get_plugins.pack_start(&warn_lbl, true, false, 0);

                let copy_btn =
                    gtk::Button::new_with_label("Copy plugins from current vim-plug configuration");
                get_plugins.pack_start(&copy_btn, false, false, 0);

                let get_plugins_lbl = gtk::Label::new("Help");
                tabs.append_page(&get_plugins, Some(&get_plugins_lbl));
            }
            vim_plug::State::Unknown => {
                let get_plugins = gtk::Box::new(gtk::Orientation::Vertical, 0);
                let get_plugins_lbl = gtk::Label::new("Get Plugins");
                tabs.append_page(&get_plugins, Some(&get_plugins_lbl));
            }
        }

        let plugins = gtk::Box::new(gtk::Orientation::Vertical, 3);
        let store = self.manager.load_store(&vim_plug_state);

        self.fill_plugin_list(&plugins, &store);

        let plugins_lbl = gtk::Label::new("Plugins");
        tabs.append_page(&plugins, Some(&plugins_lbl));

        tabs.set_tab_pos(gtk::PositionType::Left);
        content.pack_start(&tabs, true, true, 0);
        content.show_all();


        match dlg.run() {
            OK_ID => {
                println!("TODO:");
            }
            _ => (),
        }

        dlg.destroy();
    }

    fn fill_plugin_list(&self, panel: &gtk::Box, store: &Store) {
        let scroll = gtk::ScrolledWindow::new(None, None);
        let plugs_panel = gtk::ListBox::new();

        for plug_info in store.get_plugs() {
            let grid = gtk::Grid::new();
            grid.set_row_spacing(5);

            let name_lbl = gtk::Label::new(None);
            name_lbl.set_markup(&format!("<b>{}</b>", plug_info.name.as_str()));
            name_lbl.set_halign(gtk::Align::Start);
            let url_lbl = gtk::Label::new(Some(plug_info.url.as_str()));

            grid.attach(&name_lbl, 0, 0, 1, 1);
            grid.attach(&url_lbl, 0, 1, 1, 1);

            let line = gtk::Separator::new(gtk::Orientation::Horizontal);
            grid.attach(&line, 0, 2, 1, 1);

            plugs_panel.insert(&grid, -1);
        }

        scroll.add(&plugs_panel);
        panel.pack_start(&scroll, true, true, 0);

        let copy_btn =
            gtk::Button::new_with_label("Copy plugins from current vim-plug configuration");
        panel.add(&copy_btn);
    }

    fn get_state(&self) -> vim_plug::State {
        self.manager.vim_plug.get_state()
    }
}