use std::{path::PathBuf, process::Command, sync::Arc};

use chrono::Utc;
use gtk::prelude::*;
use relm4::{
    component::{AsyncComponent, AsyncComponentParts, AsyncController},
    gtk::{gdk, Adjustment},
    prelude::*,
    AsyncComponentSender,
};
use relm4_icons::icon_names;

use crate::{
    database::{self, Database},
    sheet::{I64DateTime, Sheet},
    sheet_dao, sheet_validation,
    ui::mcdu::McduOutput,
};

use super::{
    mcdu::McduModel,
    sheet_edit_dialog::{SheetEditDialogInit, SheetEditDialogModel},
    sheet_listing::{SheetListingInput, SheetListingModel, SheetListingOutput},
};

pub struct AppModel {
    database: Arc<Database>,
    directory: Arc<PathBuf>,
    mcdu: Controller<McduModel>,
    sheets_listing: Controller<SheetListingModel>,
    click_mode: ClickMode,
    scroll_adjustment: Adjustment,
    sheet_edit_dialog: Option<AsyncController<SheetEditDialogModel>>,
}

#[derive(Debug)]
pub enum ClickMode {
    Open,
    Edit,
    Annotate,
}

#[derive(Debug)]
pub enum AppInput {
    SearchStarted(String),
    SheetPressed(Sheet),
    Refresh,
    Sort,
    Shuffle,
    SetClickMode(ClickMode),
    SheetListingContentsChanged,
}

pub struct AppInitData {
    pub sheets: Vec<Sheet>,
    pub database: Database,
    pub directory: PathBuf,
}

#[relm4::component(pub, async)]
impl AsyncComponent for AppModel {
    type Input = AppInput;
    type Output = ();
    type Init = AppInitData;
    type CommandOutput = Vec<Sheet>;

    view! {
        #[root]
        gtk::Window{
            set_default_width: 300,
            set_default_height: 300,
            set_title: Some("Play music!!!"),
            set_maximized: true,
            gtk::Box {
                set_orientation: gtk::Orientation::Horizontal,
                gtk::Box {
                    set_orientation: gtk::Orientation::Vertical,
                    set_hexpand: true,
                    gtk::Box {
                        set_orientation: gtk::Orientation::Horizontal,
                        set_margin_all: 10,
                        set_spacing: 3,
                        gtk::Button {
                            set_icon_name: icon_names::REFRESH,
                            set_margin_end: 10,
                            connect_clicked[sender] => move |_| sender.input(AppInput::Refresh),
                        },
                        #[name = "button_sort"]
                        gtk::ToggleButton {
                            set_icon_name: icon_names::ARROW_SORT_REGULAR,
                            set_active: true,
                            connect_clicked[sender] => move |_| sender.input(AppInput::Sort),
                        },
                        gtk::ToggleButton {
                            set_icon_name: icon_names::PLAYLIST_SHUFFLE,
                            set_group: Some(&button_sort),
                            set_margin_end: 10,
                            connect_clicked[sender] => move |_| sender.input(AppInput::Shuffle),
                        },
                        #[name = "button_open"]
                        gtk::ToggleButton {
                            set_icon_name: icon_names::OPEN_FILLED,
                            set_active: true,
                            connect_clicked[sender] => move |button| if button.is_active() { sender.input(AppInput::SetClickMode(ClickMode::Open)) },
                        },
                        gtk::ToggleButton {
                            set_icon_name: icon_names::DOCUMENT_SETTINGS_FILLED,
                            set_group: Some(&button_open),
                            connect_clicked[sender] => move |button| if button.is_active() { sender.input(AppInput::SetClickMode(ClickMode::Edit)) },
                        },
                        gtk::ToggleButton {
                            set_icon_name: icon_names::EDIT,
                            set_group: Some(&button_open),
                            connect_clicked[sender] => move |button| if button.is_active() { sender.input(AppInput::SetClickMode(ClickMode::Annotate)) },
                        },
                    },
                    gtk::ScrolledWindow {
                        model.sheets_listing.widget(),
                        set_vexpand: true,
                        set_hexpand: true,
                        set_vadjustment: Some(&model.scroll_adjustment),
                    },
                },
                model.mcdu.widget() {
                    set_margin_all: 10,
                },
            }
        }
    }

    async fn init(
        init_data: Self::Init,
        window: Self::Root,
        sender: AsyncComponentSender<Self>,
    ) -> AsyncComponentParts<Self> {
        relm4_icons::initialize_icons();
        gtk::init().unwrap();
        let display = gdk::Display::default().unwrap();
        let theme = gtk::IconTheme::for_display(&display);

        theme.add_resource_path("/org/gtkrs/icons/");
        // theme.add_resource_path("/org/gtkrs/icons/scalable/actions/");

        let mcdu = McduModel::builder()
            .launch(())
            .forward(sender.input_sender(), |response| match response {
                McduOutput::SearchStarted(query) => AppInput::SearchStarted(query),
            });

        let mut sheets = init_data.sheets;
        sheets.sort_by(|a, b| a.cmp(b).reverse());

        let sheets_listing = SheetListingModel::builder().launch(sheets).forward(
            sender.input_sender(),
            |response| match response {
                SheetListingOutput::SheetModelSelected(sheet) => AppInput::SheetPressed(sheet),
                SheetListingOutput::ContentsChanged => AppInput::SheetListingContentsChanged,
            },
        );

        let model = AppModel {
            database: Arc::new(init_data.database),
            directory: Arc::new(init_data.directory),
            mcdu,
            sheets_listing,
            click_mode: ClickMode::Open,
            scroll_adjustment: Adjustment::builder().build(),
            sheet_edit_dialog: None,
        };

        let widgets = view_output!();

        AsyncComponentParts { model, widgets }
    }

    async fn update(
        &mut self,
        message: Self::Input,
        sender: AsyncComponentSender<Self>,
        root: &Self::Root,
    ) {
        match message {
            AppInput::SearchStarted(query) => {
                self.sheets_listing
                    .emit(SheetListingInput::Query(query.clone()));
            }
            AppInput::SheetPressed(sheet) => {
                match self.click_mode {
                    ClickMode::Open => open_sheet(&sheet, &self.database).await,
                    ClickMode::Edit => {
                        self.sheet_edit_dialog = Some(
                            SheetEditDialogModel::builder()
                                .transient_for(root)
                                .launch(SheetEditDialogInit {
                                    sheet,
                                    database: Arc::clone(&self.database),
                                })
                                .forward(sender.input_sender(), |_| todo!()),
                        );
                    }
                    ClickMode::Annotate => annotate_sheet(&sheet).await,
                };
            }
            AppInput::Refresh => {
                let db = Arc::clone(&self.database);
                let dir = Arc::clone(&self.directory);
                sender.oneshot_command(async move {
                    sheet_validation::load_and_validate_sheets(&db, dir.as_ref()).await
                });
            }
            AppInput::Sort => self.sheets_listing.emit(SheetListingInput::Sort),
            AppInput::Shuffle => self.sheets_listing.emit(SheetListingInput::Shuffle),
            AppInput::SetClickMode(click_mode) => self.click_mode = click_mode,
            AppInput::SheetListingContentsChanged => self.scroll_adjustment.set_value(0.0),
        }
    }

    async fn update_cmd(
        &mut self,
        message: Self::CommandOutput,
        _sender: AsyncComponentSender<Self>,
        _: &Self::Root,
    ) {
        let mut sheets = message;
        sheets.sort_by(|a, b| a.cmp(b).reverse());

        self.sheets_listing
            .emit(SheetListingInput::ReloadSheets(sheets));
    }
}

async fn open_sheet(sheet: &Sheet, database: &Database) {
    sheet.open_file_or_annotated_version_if_exists();
    let mut sheet = sheet.to_owned();
    sheet.last_opened = I64DateTime(Utc::now());
    sheet_dao::update_sheet_last_opened(database, &sheet)
        .await
        .unwrap();
}

async fn annotate_sheet(sheet: &Sheet) {
    Command::new("xournalpp")
        .arg(&sheet.pdf.path)
        .spawn()
        .expect("failed to execute process");
}