// Copyright 2022 System76 <info@system76.com>
// SPDX-License-Identifier: MPL-2.0

use cosmic::{
    iced_native::window,
    iced::widget::{
        column, container, horizontal_space, pick_list, progress_bar, radio, row, slider, checkbox,
    },
    iced::{self, Alignment, Application, Command, Length},
    iced_lazy::responsive,
    iced_winit::window::{drag, toggle_maximize, minimize},
    theme::{self, Theme},
    widget::{button, nav_button, nav_bar, nav_bar_page, nav_bar_section, header_bar, settings, scrollable, toggler, spin_button::{SpinButtonModel, SpinMessage}},
    Element,
    ElementExt,
};
use std::{collections::BTreeMap, vec};
use theme::Button as ButtonTheme;

#[derive(Default)]
pub struct Window {
    title: String,
    page: u8,
    debug: bool,
    theme: Theme,
    slider_value: f32,
    spin_button: SpinButtonModel<i32>,
    checkbox_value: bool,
    toggler_value: bool,
    pick_list_selected: Option<&'static str>,
    sidebar_toggled: bool,
    show_minimize: bool,
    show_maximize: bool,
    exit: bool,
}

impl Window {
    pub fn sidebar_toggled(mut self, toggled: bool) -> Self {
        self.sidebar_toggled = toggled;
        self
    }

    pub fn show_maximize(mut self, show: bool) -> Self {
        self.show_maximize = show;
        self
    }

    pub fn show_minimize(mut self, show: bool) -> Self {
        self.show_minimize = show;
        self
    }
}

#[allow(dead_code)]
#[derive(Clone, Copy, Debug)]
pub enum Message {
    Page(u8),
    Debug(bool),
    ThemeChanged(Theme),
    ButtonPressed,
    SliderChanged(f32),
    CheckboxToggled(bool),
    TogglerToggled(bool),
    PickListSelected(&'static str),
    RowSelected(usize),
    Close,
    ToggleSidebar,
    Drag,
    Minimize,
    Maximize,
    InputChanged,
    SpinButton(SpinMessage)
}

impl Application for Window {
    type Executor = iced::executor::Default;
    type Flags = ();
    type Message = Message;
    type Theme = Theme;

    fn new(_flags: ()) -> (Self, Command<Self::Message>) {
        let mut window = Window::default()
            .sidebar_toggled(true)
            .show_maximize(true)
            .show_minimize(true);
        window.slider_value = 50.0;
        //        window.theme = Theme::Light;
        window.pick_list_selected = Some("Option 1");
        window.title = String::from("COSMIC Design System - Iced");
        window.spin_button.min = -10;
        window.spin_button.max = 10;
        (window, Command::none())
    }

    fn title(&self) -> String {
        self.title.clone()
    }

    fn update(&mut self, message: Message) -> iced::Command<Self::Message> {
        match message {
            Message::Page(page) => self.page = page,
            Message::Debug(debug) => self.debug = debug,
            Message::ThemeChanged(theme) => self.theme = theme,
            Message::ButtonPressed => {}
            Message::SliderChanged(value) => self.slider_value = value,
            Message::CheckboxToggled(value) => {
                self.checkbox_value = value;
            },
            Message::TogglerToggled(value) => self.toggler_value = value,
            Message::PickListSelected(value) => self.pick_list_selected = Some(value),
            Message::Close => self.exit = true,
            Message::ToggleSidebar => self.sidebar_toggled = !self.sidebar_toggled,
            Message::Drag => return drag(window::Id::new(0)),
            Message::Minimize => return minimize(window::Id::new(0), true),
            Message::Maximize => return toggle_maximize(window::Id::new(0)),
            Message::RowSelected(row) => println!("Selected row {row}"),
            Message::InputChanged => {},
            Message::SpinButton(msg) => self.spin_button.update(msg),

        }

        Command::none()
    }

    fn view(&self) -> Element<Message> {
        let mut header = header_bar()
            .title("COSMIC Design System - Iced")
            .on_close(Message::Close)
            .on_drag(Message::Drag)
            .start(
                nav_button("Settings")
                    .on_sidebar_toggled(Message::ToggleSidebar)
                    .sidebar_active(self.sidebar_toggled)
                    .into()
            );

        if self.show_maximize {
            header = header.on_maximize(Message::Maximize);
        }

        if self.show_minimize {
            header = header.on_minimize(Message::Minimize);
        }

        let header = Into::<Element<Message>>::into(header).debug(self.debug);

        // TODO: Adding responsive makes this regenerate on every size change, and regeneration
        // involves allocations for many different items. Ideally, we could only make the nav bar
        // responsive and leave the content to be sized normally.
        let content = responsive(|size| {
            let condensed = size.width < 900.0;

            // cosmic::navbar![
            //     nav_text_button("network-wireless", "Network & Wireless", condensed)
            //         .on_press(Message::Page(0))
            //         .style(if self.page == 0 {
            //             ButtonTheme::Primary
            //         } else {
            //             ButtonTheme::Text
            //         }),
            //     nav_text_button("preferences-desktop", "Bluetooth", condensed)
            //         .on_press(Message::Page(1))
            //         .style(if self.page == 1 {
            //             ButtonTheme::Primary
            //         } else {
            //             ButtonTheme::Text
            //         }),
            //     nav_text_button("system-software-update", "Personalization", condensed)
            //         .on_press(Message::Page(2))
            //         .style(if self.page == 2 {
            //             ButtonTheme::Primary
            //         } else {
            //             ButtonTheme::Text
            //         }),
            // ]

            let sidebar: Element<_> = nav_bar()
                .source(BTreeMap::from([
                    (
                        nav_bar_section()
                            .title("Network & Wireless")
                            .icon("network-wireless"),
                        vec![nav_bar_page("Wi-Fi")],
                    ),
                    (
                        nav_bar_section().title("Bluetooth").icon("cs-bluetooth"),
                        vec![nav_bar_page("Devices")],
                    ),
                    (
                        nav_bar_section()
                            .title("Personalization")
                            .icon("applications-system"),
                        vec![
                            nav_bar_page("Desktop Session"),
                            nav_bar_page("Wallpaper"),
                            nav_bar_page("Appearance"),
                            nav_bar_page("Dock & Top Panel"),
                            nav_bar_page("Workspaces"),
                            nav_bar_page("Notifications"),
                        ],
                    ),
                    (
                        nav_bar_section()
                            .title("Input Devices")
                            .icon("input-keyboard"),
                        vec![nav_bar_page("Keyboard")],
                    ),
                    (
                        nav_bar_section().title("Displays").icon("cs-display"),
                        vec![nav_bar_page("Keyboard")],
                    ),
                    (
                        nav_bar_section().title("Power & Battery").icon("battery"),
                        vec![nav_bar_page("Status")],
                    ),
                    (
                        nav_bar_section().title("Sound").icon("sound"),
                        vec![nav_bar_page("Volume")],
                    ),
                ]))
                .active(self.sidebar_toggled)
                .condensed(condensed)
                .into();

            let choose_theme = [Theme::Light, Theme::Dark].iter().fold(
                row![].spacing(10).align_items(Alignment::Center),
                |row, theme| {
                    row.push(radio(
                        format!("{:?}", theme),
                        *theme,
                        Some(self.theme),
                        Message::ThemeChanged,
                    ))
                },
            );

            let content: Element<_> = settings::view_column(vec![
                settings::view_section("Debug")
                    .add(settings::item("Debug theme", choose_theme))
                    .add(settings::item(
                        "Debug layout",
                        toggler(String::from("Debug layout"), self.debug, Message::Debug)
                    ))
                    .into(),
                settings::view_section("Buttons")
                    .add(settings::item_row(vec![
                        button(ButtonTheme::Primary)
                            .text("Primary")
                            .on_press(Message::ButtonPressed)
                            .into(),
                        button(ButtonTheme::Secondary)
                            .text("Secondary")
                            .on_press(Message::ButtonPressed)
                            .into(),
                        button(ButtonTheme::Positive)
                            .text("Positive")
                            .on_press(Message::ButtonPressed)
                            .into(),
                        button(ButtonTheme::Destructive)
                            .text("Destructive")
                            .on_press(Message::ButtonPressed)
                            .into(),
                        button(ButtonTheme::Text)
                            .text("Text")
                            .on_press(Message::ButtonPressed)
                            .into()
                    ]))
                    .add(settings::item_row(vec![
                        button(ButtonTheme::Primary).text("Primary").into(),
                        button(ButtonTheme::Secondary).text("Secondary").into(),
                        button(ButtonTheme::Positive).text("Positive").into(),
                        button(ButtonTheme::Destructive).text("Destructive").into(),
                        button(ButtonTheme::Text).text("Text").into(),
                    ]))
                    .into(),
                settings::view_section("Controls")
                    .add(settings::item("Toggler", toggler(None, self.toggler_value, Message::TogglerToggled)))
                    .add(settings::item(
                        "Pick List (TODO)",
                        pick_list(
                            vec!["Option 1", "Option 2", "Option 3", "Option 4",],
                            self.pick_list_selected,
                            Message::PickListSelected
                        )
                        .padding([8, 0, 8, 16])
                    ))
                    .add(settings::item(
                        "Slider",
                        slider(0.0..=100.0, self.slider_value, Message::SliderChanged)
                            .width(Length::Units(250))
                    ))
                    .add(settings::item(
                        "Progress",
                        progress_bar(0.0..=100.0, self.slider_value)
                            .width(Length::Units(250))
                            .height(Length::Units(4))
                    ))
                    .add(settings::item_row(vec![
                        checkbox("Checkbox", self.checkbox_value, Message::CheckboxToggled).into()
                    ]))
                    .add(settings::item(
                        format!("Spin Button (Range {}:{})", self.spin_button.min, self.spin_button.max),
                        self.spin_button.view(Message::SpinButton),
                    ))
                    .into()
            ])
            .into();

            let mut widgets = Vec::with_capacity(2);

            widgets.push(sidebar.debug(self.debug));

            widgets.push(
                scrollable(row![
                    horizontal_space(Length::Fill),
                    content.debug(self.debug),
                    horizontal_space(Length::Fill),
                ])
                .into(),
            );

            container(row(widgets))
                .padding([16, 16])
                .width(Length::Fill)
                .height(Length::Fill)
                .into()
        })
        .into();

        column(vec![header, content]).into()
    }

    fn should_exit(&self) -> bool {
        self.exit
    }

    fn theme(&self) -> Theme {
        self.theme
    }
}