// Monologue Trees Editor
//
// Editor for creating Monologue Trees levels
//
// TODO:
// * Tree Organization: GLTF contains Animations and Scenes
// * Camera can only select one at a time.
// * (hard) Better Colorscheme
// * (medium) Visual errors for bad GLTFs
// * (medium) Collapsable containers (Gltfs, Animations, Scenes, Audio Clips, Cameras)
// * (medium) Show/hide entire UI
// * (medium) Spawn clicked scene
// * (medium) Play clicked animation
// * (idea) Use enum instead of markers for exclusive UI
// * (medium) Add fonts similar to Audios based on inspect-fonts
// * (hard) Add Dialogs (requires text box UI, saving, loading)

use bevy::{
    asset::{AssetPath, Assets},
    gltf::Gltf,
    input::{keyboard::KeyboardInput, ButtonState},
    prelude::*,
    utils::HashSet,
};
use monologue_trees::{debug::*, ui};

fn main() {
    App::new()
        .add_plugins((
            DefaultPlugins.set(WindowPlugin {
                primary_window: Some(Window {
                    title: "Monologue Trees Editor".into(),
                    resolution: (640., 480.).into(),
                    ..default()
                }),
                ..default()
            }),
            DebugInfoPlugin,
            ui::GameUiPlugin,
        ))
        .init_resource::<AssetRegistry>()
        .add_systems(Startup, initialize_ui)
        .add_systems(Update, (import_files, import_audio, play_audio))
        .run();
}

#[derive(Resource, Default)]
struct AssetRegistry(Vec<HandleUntyped>);

#[derive(Resource)]
struct Styles {
    button: Style,
    button_hovered: Style,
    container: Style,
}

fn initialize_ui(mut commands: Commands) {
    commands.spawn((
        Camera2dBundle { ..default() },
        UiCameraConfig { show_ui: true },
    ));

    let base_style = Style {
        border: UiRect::all(Val::Px(1.0)),
        padding: UiRect::all(Val::Px(5.0)),
        flex_direction: FlexDirection::Column,
        overflow: Overflow::clip(),
        ..default()
    };

    commands
        .spawn(NodeBundle {
            style: Style {
                width: Val::Percent(50.0),
                height: Val::Percent(50.0),
                ..base_style.clone()
            },
            background_color: Color::WHITE.into(),
            border_color: Color::BLACK.into(),
            z_index: ZIndex::Local(100),
            ..default()
        })
        .with_children(|parent| {
            {
                parent
                    .spawn(NodeBundle {
                        style: Style {
                            ..base_style.clone()
                        },
                        background_color: Color::WHITE.into(),
                        border_color: Color::BLACK.into(),
                        z_index: ZIndex::Local(20),
                        ..default()
                    })
                    .with_children(|parent| {
                        // Spawn button container
                        let container = parent
                            .spawn((
                                NodeBundle {
                                    style: Style {
                                        ..base_style.clone()
                                    },
                                    background_color: Color::WHITE.into(),
                                    border_color: Color::BLACK.into(),
                                    z_index: ZIndex::Local(10),
                                    ..default()
                                },
                                AudioWidget,
                                ui::Scroll,
                                ui::Sorting(2),
                            ))
                            .id();

                        // Spawn widget
                        parent.spawn((
                            ButtonBundle {
                                style: Style {
                                    ..base_style.clone()
                                },
                                background_color: Color::WHITE.into(),
                                border_color: Color::BLACK.into(),
                                z_index: ZIndex::Local(15),
                                ..default()
                            },
                            ui::Title {
                                name: "Audio".into(),
                            },
                            ui::Collapse { target: container },
                            ui::Sorting(1),
                        ));
                    });
            }
        });

    commands.insert_resource(Styles {
        button: Style { ..default() },
        button_hovered: Style { ..default() },
        container: Style { ..default() },
    })
}

fn import_files(
    mut events: EventReader<FileDragAndDrop>,
    server: Res<AssetServer>,
    mut registry: ResMut<AssetRegistry>,
) {
    events.iter().for_each(|event| match event {
        FileDragAndDrop::DroppedFile { path_buf, .. } => {
            registry.0.push(
                server.load_untyped(
                    path_buf
                        .clone()
                        .into_os_string()
                        .into_string()
                        .expect("Path converts to string"),
                ),
            );
        }
        _ => (),
    })
}

use audio::*;
mod audio {
    use bevy::audio::PlaybackMode;

    use super::*;

    #[derive(Debug, Component)]
    pub struct AudioWidget;

    pub fn import_audio(
        mut events: EventReader<AssetEvent<AudioSource>>,
        mut commands: Commands,
        root: Query<Entity, With<AudioWidget>>,
        current: Query<(Entity, &Handle<AudioSource>)>,
        server: Res<AssetServer>,
    ) {
        // TODO: Filter to just audio files
        events
            .iter()
            .filter(|event| match event {
                AssetEvent::Created { handle }
                | AssetEvent::Removed { handle }
                | AssetEvent::Modified { handle } => {
                    if let Some(asset_path) = server.get_handle_path(handle.clone()) {
                        if let Some(extension) = asset_path.path().extension() {
                            extension == "ogg"
                        } else {
                            false
                        }
                    } else {
                        false
                    }
                }
            })
            .for_each(|event| {
                let create = |commands: &mut Commands, handle: Handle<AudioSource>| {
                    commands.entity(root.single()).with_children(|parent| {
                        let name = {
                            if let Some(asset_path) = server.get_handle_path(handle.clone()) {
                                if let Some(stem) = asset_path.path().file_stem() {
                                    if let Some(val) = stem.to_str() {
                                        String::from(val)
                                    } else {
                                        String::from("???")
                                    }
                                } else {
                                    String::from("???")
                                }
                            } else {
                                String::from("???")
                            }
                        };
                        let settings = PlaybackSettings {
                            mode: PlaybackMode::Loop,
                            paused: true,
                            ..default()
                        };
                        parent.spawn((
                            AudioSourceBundle {
                                source: handle,
                                settings,
                            },
                            ButtonBundle {
                                style: Style {
                                    border: UiRect::all(Val::Px(1.0)),
                                    margin: UiRect::all(Val::Px(5.0)),
                                    padding: UiRect::all(Val::Px(5.0)),
                                    ..default()
                                },
                                border_color: Color::BLACK.into(),
                                ..default()
                            },
                            ui::Title { name },
                        ));
                    });
                };
                let destroy = |commands: &mut Commands, handle: Handle<AudioSource>| {
                    if let Some(entity) = current.iter().find_map(|(entity, current)| {
                        if *current == handle {
                            Some(entity)
                        } else {
                            None
                        }
                    }) {
                        commands.entity(entity).despawn_recursive();
                    }
                };
                match event {
                    AssetEvent::Created { handle } => {
                        info!("Asset created! {:?}", event);
                        create(&mut commands, handle.clone());
                    }
                    AssetEvent::Removed { handle } => {
                        info!("Asset removed! {:?}", event);
                        destroy(&mut commands, handle.clone());
                    }
                    AssetEvent::Modified { handle } => {
                        info!("Asset modified! {:?}", event);
                        destroy(&mut commands, handle.clone());
                        create(&mut commands, handle.clone());
                    }
                }
            });
    }

    pub fn play_audio(
        events: Query<(Entity, &Interaction, &AudioSink), (With<Button>, Changed<Interaction>)>,
        mut commands: Commands,
    ) {
        events
            .iter()
            .filter(|(_, &interaction, _)| interaction == Interaction::Pressed)
            .for_each(|(entity, _, sink)| {
                sink.toggle();
                if sink.is_paused() {
                    commands.entity(entity).remove::<ui::Active>();
                } else {
                    commands.entity(entity).insert(ui::Active);
                }
            });
    }
}