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use std::cell::RefCell;
use std::ops::Deref;
use std::rc::Rc;
use std::sync::Arc;

use crate::ui::UiMutex;

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

use super::manager;
use super::plugin_settings_dlg;
use super::store::{PlugInfo, Store};
use super::vimawesome;
use crate::nvim_config::NvimConfig;

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

impl<'a> Ui<'a> {
    pub fn new(manager: &'a Arc<UiMutex<manager::Manager>>) -> Ui<'a> {
        manager.borrow_mut().reload_store();

        Ui { manager }
    }

    pub fn show<T: IsA<gtk::Window>>(&mut self, parent: &T) {
        let dlg = gtk::Dialog::new_with_buttons(
            Some("Plug"),
            Some(parent),
            gtk::DialogFlags::DESTROY_WITH_PARENT,
            &[
                ("Cancel", gtk::ResponseType::Cancel.into()),
                ("Ok", gtk::ResponseType::Ok.into()),
            ],
        );

        dlg.set_default_size(800, 600);
        let content = dlg.get_content_area();

        let header_bar = gtk::HeaderBar::new();

        let add_plug_btn = gtk::Button::new_with_label("Add..");
        add_plug_btn
            .get_style_context()
            .add_class("suggested-action");
        header_bar.pack_end(&add_plug_btn);

        let enable_swc = gtk::Switch::new();
        enable_swc.set_valign(gtk::Align::Center);
        enable_swc.show();

        header_bar.pack_end(&enable_swc);

        header_bar.set_title("Plug");
        header_bar.set_show_close_button(true);
        header_bar.show();

        dlg.set_titlebar(&header_bar);

        let pages = SettingsPages::new(
            clone!(add_plug_btn => move |row_name| if row_name == "plugins" {
                add_plug_btn.show();
            } else {
                add_plug_btn.hide();
            }),
        );

        enable_swc.set_state(self.manager.borrow().store.is_enabled());

        let plugins = gtk::Box::new(gtk::Orientation::Vertical, 3);
        let plugs_panel = self.fill_plugin_list(&plugins, &self.manager.borrow().store);

        add_vimawesome_tab(&pages, &self.manager, &plugs_panel);

        let plugins_lbl = gtk::Label::new("Plugins");
        pages.add_page(&plugins_lbl, &plugins, "plugins");

        add_help_tab(
            &pages,
            &format!(
                "NeovimGtk plugin manager is a GUI for vim-plug.\n\
            It can load plugins from vim-plug configuration if vim-plug sarted and NeovimGtk manager settings is empty.\n\
            When enabled it generate and load vim-plug as simple vim file at startup before init.vim is processed.\n\
            So <b>after</b> enabling this manager <b>you must disable vim-plug</b> configuration in init.vim.\n\
            This manager currently only manage vim-plug configuration and do not any actions on plugin management.\n\
            So you must call all vim-plug (PlugInstall, PlugUpdate, PlugClean) commands manually.\n\
            Current configuration source is <b>{}</b>",
                match self.manager.borrow().plug_manage_state {
                    manager::PlugManageState::NvimGtk => "NeovimGtk config file",
                    manager::PlugManageState::VimPlug => "loaded from vim-plug",
                    manager::PlugManageState::Unknown => "Unknown",
                }
            ),
        );

        let manager_ref = self.manager.clone();
        enable_swc.connect_state_set(move |_, state| {
            manager_ref.borrow_mut().store.set_enabled(state);
            Inhibit(false)
        });

        let manager_ref = self.manager.clone();
        add_plug_btn.connect_clicked(clone!(dlg => move |_| {
            show_add_plug_dlg(&dlg, &manager_ref, &plugs_panel);
        }));

        content.pack_start(&*pages, true, true, 0);
        content.show_all();

        let ok: i32 = gtk::ResponseType::Ok.into();
        if dlg.run() == ok {
            let mut manager = self.manager.borrow_mut();
            manager.clear_removed();
            manager.save();
            if let Some(config_path) = NvimConfig::new(manager.generate_config()).generate_config()
            {
                if let Some(path) = config_path.to_str() {
                    manager.vim_plug.reload(path);
                }
            }
        }

        dlg.destroy();
    }

    fn fill_plugin_list(&self, panel: &gtk::Box, store: &Store) -> gtk::ListBox {
        let scroll = gtk::ScrolledWindow::new(
            Option::<&gtk::Adjustment>::None,
            Option::<&gtk::Adjustment>::None,
        );
        scroll.get_style_context().add_class("view");
        let plugs_panel = gtk::ListBox::new();

        for (idx, plug_info) in store.get_plugs().iter().enumerate() {
            let row = create_plug_row(idx, plug_info, &self.manager);

            plugs_panel.add(&row);
        }

        scroll.add(&plugs_panel);
        panel.pack_start(&scroll, true, true, 5);

        panel.pack_start(
            &create_up_down_btns(&plugs_panel, &self.manager),
            false,
            true,
            0,
        );

        plugs_panel
    }
}

fn create_up_down_btns(
    plugs_panel: &gtk::ListBox,
    manager: &Arc<UiMutex<manager::Manager>>,
) -> gtk::Box {
    let buttons_panel = gtk::Box::new(gtk::Orientation::Horizontal, 5);
    let up_btn = gtk::Button::new_from_icon_name("go-up-symbolic", gtk::IconSize::Button);
    let down_btn = gtk::Button::new_from_icon_name("go-down-symbolic", gtk::IconSize::Button);

    up_btn.connect_clicked(clone!(plugs_panel, manager => move |_| {
        if let Some(row) = plugs_panel.get_selected_row() {
            let idx = row.get_index();
            if idx > 0 {
                plugs_panel.unselect_row(&row);
                plugs_panel.remove(&row);
                plugs_panel.insert(&row, idx - 1);
                plugs_panel.select_row(&row);
                manager.borrow_mut().move_item(idx as usize, -1);
            }
        }
    }));

    down_btn.connect_clicked(clone!(plugs_panel, manager => move |_| {
        if let Some(row) = plugs_panel.get_selected_row() {
            let idx = row.get_index();
            let mut manager = manager.borrow_mut();
            if idx >= 0 && idx < manager.store.plugs_count() as i32 {
                plugs_panel.unselect_row(&row);
                plugs_panel.remove(&row);
                plugs_panel.insert(&row, idx + 1);
                plugs_panel.select_row(&row);
                manager.move_item(idx as usize, 1);
            }
        }
    }));

    buttons_panel.pack_start(&up_btn, false, true, 0);
    buttons_panel.pack_start(&down_btn, false, true, 0);
    buttons_panel.set_halign(gtk::Align::Center);

    buttons_panel
}

fn populate_get_plugins(
    query: Option<String>,
    get_plugins: &gtk::Box,
    manager: Arc<UiMutex<manager::Manager>>,
    plugs_panel: gtk::ListBox,
) {
    let plugs_panel = UiMutex::new(plugs_panel);
    let get_plugins = UiMutex::new(get_plugins.clone());
    vimawesome::call(query, move |res| {
        let panel = get_plugins.borrow();
        for child in panel.get_children() {
            panel.remove(&child);
        }
        match res {
            Ok(list) => {
                let result = vimawesome::build_result_panel(&list, move |new_plug| {
                    add_plugin(&manager, &*plugs_panel.borrow(), new_plug);
                });
                panel.pack_start(&result, true, true, 0);
            }
            Err(e) => {
                panel.pack_start(&gtk::Label::new(format!("{}", e).as_str()), false, true, 0);
                error!("{}", e)
            }
        }
    });
}

fn create_plug_row(
    plug_idx: usize,
    plug_info: &PlugInfo,
    manager: &Arc<UiMutex<manager::Manager>>,
) -> gtk::ListBoxRow {
    let row = gtk::ListBoxRow::new();
    let row_container = gtk::Box::new(gtk::Orientation::Vertical, 5);
    row_container.set_border_width(5);
    let hbox = gtk::Box::new(gtk::Orientation::Horizontal, 5);
    let label_box = create_plug_label(plug_info);

    let button_box = gtk::Box::new(gtk::Orientation::Horizontal, 0);
    button_box.set_halign(gtk::Align::End);

    let exists_button_box = gtk::Box::new(gtk::Orientation::Horizontal, 5);

    let remove_btn = gtk::Button::new_with_label("Remove");
    exists_button_box.pack_start(&remove_btn, false, true, 0);

    let undo_btn = gtk::Button::new_with_label("Undo");

    row_container.pack_start(&hbox, true, true, 0);
    hbox.pack_start(&label_box, true, true, 0);
    button_box.pack_start(&exists_button_box, false, true, 0);
    hbox.pack_start(&button_box, false, true, 0);

    row.add(&row_container);

    remove_btn.connect_clicked(
        clone!(manager, label_box, button_box, exists_button_box, undo_btn => move |_| {
            label_box.set_sensitive(false);
            button_box.remove(&exists_button_box);
            button_box.pack_start(&undo_btn, false, true, 0);
            button_box.show_all();
            manager.borrow_mut().store.remove_plug(plug_idx);
        }),
    );

    undo_btn.connect_clicked(
        clone!(manager, label_box, button_box, exists_button_box, undo_btn => move |_| {
            label_box.set_sensitive(true);
            button_box.remove(&undo_btn);
            button_box.pack_start(&exists_button_box, false, true, 0);
            button_box.show_all();
            manager.borrow_mut().store.restore_plug(plug_idx);
        }),
    );

    row
}

fn show_add_plug_dlg<F: IsA<gtk::Window>>(
    parent: &F,
    manager: &Arc<UiMutex<manager::Manager>>,
    plugs_panel: &gtk::ListBox,
) {
    if let Some(new_plugin) = plugin_settings_dlg::Builder::new("Add plugin").show(parent) {
        add_plugin(manager, plugs_panel, new_plugin);
    }
}

fn add_plugin(
    manager: &Arc<UiMutex<manager::Manager>>,
    plugs_panel: &gtk::ListBox,
    new_plugin: PlugInfo,
) -> bool {
    let row = create_plug_row(manager.borrow().store.plugs_count(), &new_plugin, manager);

    if manager.borrow_mut().add_plug(new_plugin) {
        row.show_all();
        plugs_panel.add(&row);
        true
    } else {
        let dlg = gtk::MessageDialog::new(
            None::<&gtk::Window>,
            gtk::DialogFlags::empty(),
            gtk::MessageType::Error,
            gtk::ButtonsType::Ok,
            "Plugin with this name or path already exists",
        );
        dlg.run();
        dlg.destroy();
        false
    }
}

fn create_plug_label(plug_info: &PlugInfo) -> gtk::Box {
    let label_box = gtk::Box::new(gtk::Orientation::Vertical, 5);

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

    label_box.pack_start(&name_lbl, true, true, 0);
    label_box.pack_start(&url_lbl, true, true, 0);
    label_box
}

fn add_vimawesome_tab(
    pages: &SettingsPages,
    manager: &Arc<UiMutex<manager::Manager>>,
    plugs_panel: &gtk::ListBox,
) {
    let get_plugins = gtk::Box::new(gtk::Orientation::Vertical, 0);
    let spinner = gtk::Spinner::new();
    let get_plugins_lbl = gtk::Label::new("Get Plugins");
    pages.add_page(&get_plugins_lbl, &get_plugins, "get_plugins");

    let list_panel = gtk::Box::new(gtk::Orientation::Vertical, 0);
    let link_button = gtk::Label::new(None);
    link_button.set_markup(
        "Plugins are taken from: <a href=\"https://vimawesome.com\">https://vimawesome.com</a>",
    );
    let search_entry = gtk::SearchEntry::new();

    get_plugins.pack_start(&link_button, false, true, 10);
    get_plugins.pack_start(&search_entry, false, true, 5);
    get_plugins.pack_start(&list_panel, true, true, 0);
    list_panel.pack_start(&spinner, true, true, 0);
    spinner.start();

    search_entry.connect_activate(clone!(list_panel, manager, plugs_panel => move |se| {
        let spinner = gtk::Spinner::new();
        list_panel.pack_start(&spinner, false, true, 5);
        spinner.show();
        spinner.start();
        populate_get_plugins(se.get_text().map(Into::into), &list_panel, manager.clone(), plugs_panel.clone());
    }));

    gtk::idle_add(clone!(manager, plugs_panel => move || {
        populate_get_plugins(None, &list_panel, manager.clone(), plugs_panel.clone());
        Continue(false)
    }));
}

fn add_help_tab(pages: &SettingsPages, markup: &str) {
    let help = gtk::Box::new(gtk::Orientation::Vertical, 3);
    let label = gtk::Label::new(None);
    label.set_markup(markup);
    help.pack_start(&label, true, false, 0);

    let help_lbl = gtk::Label::new("Help");
    pages.add_page(&help_lbl, &help, "help");
}

struct SettingsPages {
    categories: gtk::ListBox,
    stack: gtk::Stack,
    content: gtk::Box,
    rows: Rc<RefCell<Vec<(gtk::ListBoxRow, &'static str)>>>,
}

impl SettingsPages {
    pub fn new<F: Fn(&str) + 'static>(row_selected: F) -> Self {
        let content = gtk::Box::new(gtk::Orientation::Horizontal, 5);
        let categories = gtk::ListBox::new();
        categories.get_style_context().add_class("view");
        let stack = gtk::Stack::new();
        stack.set_transition_type(gtk::StackTransitionType::Crossfade);
        let rows: Rc<RefCell<Vec<(gtk::ListBoxRow, &'static str)>>> =
            Rc::new(RefCell::new(Vec::new()));

        content.pack_start(&categories, false, true, 0);
        content.pack_start(&stack, true, true, 0);

        categories.connect_row_selected(
            clone!(stack, rows => move |_, row| if let &Some(ref row) = row {
                if let Some(ref r) = rows.borrow().iter().find(|r| r.0 == *row) {
                    if let Some(child) = stack.get_child_by_name(&r.1) {
                        stack.set_visible_child(&child);
                        row_selected(&r.1);
                    }

                }
            }),
        );

        SettingsPages {
            categories,
            stack,
            content,
            rows,
        }
    }

    fn add_page<W: gtk::IsA<gtk::Widget>>(
        &self,
        label: &gtk::Label,
        widget: &W,
        name: &'static str,
    ) {
        let row = gtk::ListBoxRow::new();

        let hbox = gtk::Box::new(gtk::Orientation::Horizontal, 0);
        hbox.set_border_width(12);
        hbox.pack_start(label, false, true, 0);
        row.add(&hbox);

        self.categories.add(&row);
        self.stack.add_named(widget, name);
        self.rows.borrow_mut().push((row, name));
    }
}

impl Deref for SettingsPages {
    type Target = gtk::Box;

    fn deref(&self) -> &gtk::Box {
        &self.content
    }
}