use crate::{
    app::UserEvent,
    emulator::{EmulatorClient, EmulatorCommand, SimId},
};
use egui::{
    menu, Button, CentralPanel, Color32, Context, Frame, Response, TopBottomPanel, Ui,
    ViewportBuilder, ViewportCommand, ViewportId, WidgetText,
};
use winit::event_loop::EventLoopProxy;

use super::{
    game_screen::{DisplayMode, GameScreen},
    AppWindow,
};

pub struct GameWindow {
    client: EmulatorClient,
    proxy: EventLoopProxy<UserEvent>,
    sim_id: SimId,
    display_mode: DisplayMode,
    screen: Option<GameScreen>,
}

impl GameWindow {
    pub fn new(client: EmulatorClient, proxy: EventLoopProxy<UserEvent>, sim_id: SimId) -> Self {
        Self {
            client,
            proxy,
            sim_id,
            display_mode: DisplayMode::Anaglyph,
            screen: None,
        }
    }

    fn show_menu(&mut self, ctx: &Context, ui: &mut Ui) {
        ui.menu_button("ROM", |ui| {
            if ui.button("Open ROM").clicked() {
                let rom = rfd::FileDialog::new()
                    .add_filter("Virtual Boy ROMs", &["vb", "vbrom"])
                    .pick_file();
                if let Some(path) = rom {
                    self.client
                        .send_command(EmulatorCommand::LoadGame(SimId::Player1, path));
                }
                ui.close_menu();
            }
            if ui.button("Quit").clicked() {
                ctx.send_viewport_cmd(ViewportCommand::Close);
            }
        });
        ui.menu_button("Emulation", |ui| {
            let has_game = self.client.has_game(self.sim_id);
            if self.client.is_running(self.sim_id) {
                if ui.add_enabled(has_game, Button::new("Pause")).clicked() {
                    self.client.send_command(EmulatorCommand::Pause);
                    ui.close_menu();
                }
            } else if ui.add_enabled(has_game, Button::new("Resume")).clicked() {
                self.client.send_command(EmulatorCommand::Resume);
                ui.close_menu();
            }
            if ui.add_enabled(has_game, Button::new("Reset")).clicked() {
                self.client
                    .send_command(EmulatorCommand::Reset(self.sim_id));
                ui.close_menu();
            }
        });
        ui.menu_button("Video", |ui| {
            ui.menu_button("Screen Size", |ui| {
                let current_dims = ctx.input(|i| i.viewport().inner_rect.unwrap());
                let current_dims = current_dims.max - current_dims.min;

                for scale in 1..=4 {
                    let label = format!("x{scale}");
                    let scale = scale as f32;
                    let dims = (384.0 * scale, 224.0 * scale + 22.0).into();
                    if ui
                        .selectable_button((current_dims - dims).length() < 1.0, label)
                        .clicked()
                    {
                        ctx.send_viewport_cmd(ViewportCommand::InnerSize(dims));
                        ui.close_menu();
                    }
                }
            });

            ui.menu_button("Display Mode", |ui| {
                if ui
                    .selectable_option(&mut self.display_mode, DisplayMode::Anaglyph, "Anaglyph")
                    .clicked()
                {
                    ui.close_menu();
                }
                if ui
                    .selectable_option(&mut self.display_mode, DisplayMode::LeftEye, "Left Eye")
                    .clicked()
                {
                    ui.close_menu();
                }
                if ui
                    .selectable_option(&mut self.display_mode, DisplayMode::RightEye, "Right Eye")
                    .clicked()
                {
                    ui.close_menu();
                }
            });
        });
        ui.menu_button("Audio", |ui| {
            let p1_enabled = self.client.is_audio_enabled(SimId::Player1);
            let p2_enabled = self.client.is_audio_enabled(SimId::Player2);
            if ui.selectable_button(p1_enabled, "Player 1").clicked() {
                self.client
                    .send_command(EmulatorCommand::SetAudioEnabled(!p1_enabled, p2_enabled));
                ui.close_menu();
            }
            if ui.selectable_button(p2_enabled, "Player 2").clicked() {
                self.client
                    .send_command(EmulatorCommand::SetAudioEnabled(p1_enabled, !p2_enabled));
                ui.close_menu();
            }
        });
        ui.menu_button("Input", |ui| {
            if ui.button("Bind Inputs").clicked() {
                self.proxy.send_event(UserEvent::OpenInput).unwrap();
                ui.close_menu();
            }
        });
        ui.menu_button("Multiplayer", |ui| {
            if self.sim_id == SimId::Player1
                && !self.client.has_player_2()
                && ui.button("Open Player 2").clicked()
            {
                self.client
                    .send_command(EmulatorCommand::StartSecondSim(None));
                self.proxy.send_event(UserEvent::OpenPlayer2).unwrap();
                ui.close_menu();
            }
            if self.client.has_player_2() {
                let linked = self.client.are_sims_linked();
                if linked && ui.button("Unlink").clicked() {
                    self.client.send_command(EmulatorCommand::Unlink);
                    ui.close_menu();
                }
                if !linked && ui.button("Link").clicked() {
                    self.client.send_command(EmulatorCommand::Link);
                    ui.close_menu();
                }
            }
        });
    }
}

impl AppWindow for GameWindow {
    fn viewport_id(&self) -> ViewportId {
        match self.sim_id {
            SimId::Player1 => ViewportId::ROOT,
            SimId::Player2 => ViewportId::from_hash_of("Player2"),
        }
    }

    fn initial_viewport(&self) -> ViewportBuilder {
        ViewportBuilder::default()
            .with_title("Shrooms VB")
            .with_inner_size((384.0, 246.0))
    }

    fn show(&mut self, ctx: &Context) {
        TopBottomPanel::top("menubar")
            .exact_height(22.0)
            .show(ctx, |ui| {
                menu::bar(ui, |ui| {
                    self.show_menu(ctx, ui);
                });
            });
        let frame = Frame::central_panel(&ctx.style()).fill(Color32::BLACK);
        CentralPanel::default().frame(frame).show(ctx, |ui| {
            if let Some(screen) = self.screen.as_mut() {
                screen.display_mode = self.display_mode;
                ui.add(screen);
            }
        });
    }

    fn on_init(&mut self, render_state: &egui_wgpu::RenderState) {
        let (screen, sink) = GameScreen::init(render_state);
        self.client
            .send_command(EmulatorCommand::SetRenderer(self.sim_id, sink));
        self.screen = Some(screen)
    }

    fn on_destroy(&mut self) {
        if self.sim_id == SimId::Player2 {
            self.client.send_command(EmulatorCommand::StopSecondSim);
        }
    }
}

trait UiExt {
    fn selectable_button(&mut self, selected: bool, text: impl Into<WidgetText>) -> Response;
    fn selectable_option<T: Eq>(
        &mut self,
        current_value: &mut T,
        selected_value: T,
        text: impl Into<WidgetText>,
    ) -> Response {
        let response = self.selectable_button(*current_value == selected_value, text);
        if response.clicked() {
            *current_value = selected_value;
        }
        response
    }
}

impl UiExt for Ui {
    fn selectable_button(&mut self, selected: bool, text: impl Into<WidgetText>) -> Response {
        self.style_mut().visuals.widgets.inactive.bg_fill = Color32::TRANSPARENT;
        self.style_mut().visuals.widgets.hovered.bg_fill = Color32::TRANSPARENT;
        self.style_mut().visuals.widgets.active.bg_fill = Color32::TRANSPARENT;
        let mut selected = selected;
        self.checkbox(&mut selected, text)
    }
}