use super::*;

/// Debugging systems, resources, events, etc.
pub struct DebuggingPlugin;

impl Plugin for DebuggingPlugin {
    fn build(&self, app: &mut App) {
        app.init_state::<DebuggingState>()
            .init_resource::<ToolTip>()
            .add_plugins(RapierDebugRenderPlugin::default().disabled())
            // Added by Rapier
            // .add_plugins(AabbGizmoPlugin)
            // .add_plugins(LightGizmoPlugin)
            .add_systems(Startup, init_debug_ui)
            .add_systems(
                Update,
                (
                    (toggle_state_visibility::<DebuggingState>,)
                        .run_if(state_changed::<DebuggingState>),
                    toggle_debug_state.run_if(on_keyboard_press(KeyCode::F12)),
                    (toggle_light_gizmo, toggle_aabb_gizmo).run_if(state_changed::<DebuggingState>),
                    (
                        (hover_mesh, hover_ui)
                            .run_if(on_event::<Pointer<Over>>.or(on_event::<Pointer<Out>>)),
                        tooltip_follow.run_if(any_component_changed::<Window>),
                        sync_resource_to_ui::<ToolTip>.run_if(resource_changed::<ToolTip>),
                    )
                        .run_if(in_state(DebuggingState::On)),
                ),
            );

        // WebGL2-incompatible systems
        #[cfg(not(target_arch = "wasm32"))]
        {
            app.add_plugins(WireframePlugin::default())
                .insert_resource(WireframeConfig {
                    global: false,
                    default_color: MAGENTA.into(),
                })
                .add_systems(
                    Update,
                    toggle_rapier_debug_render.run_if(state_changed::<DebuggingState>),
                )
                .add_systems(OnEnter(DebuggingState::On), enable_wireframe)
                .add_systems(OnExit(DebuggingState::On), disable_wireframe);
        }
    }
}

/// Tracks if the debugger is on or off for other games systems to hook into
///
/// The Debugging state may add it's own global debugging information, but is mostly a shell
#[derive(States, Component, Default, Debug, Clone, Hash, Eq, PartialEq)]
pub enum DebuggingState {
    #[default]
    Off,
    On,
}

/// Create the Debugging UI
fn init_debug_ui(mut commands: Commands) {
    // "Debugging On" Indicator
    commands.spawn((
        DebuggingState::On,
        Name::new("Debug Indicator"),
        Text(" Debug: ON ".into()),
        TextColor(WHITE.into()),
        BackgroundColor(RED.into()),
        BorderRadius::MAX,
        Node {
            align_self: AlignSelf::Center,
            justify_self: JustifySelf::End,
            ..default()
        },
    ));

    // Version string for troubleshooting
    commands.spawn((
        DebuggingState::On,
        Name::new("Version #"),
        Text::new(VERSION),
        TextColor(WHITE.into()),
        BackgroundColor(BLACK.into()),
        Node {
            width: Val::Auto,
            align_self: AlignSelf::End,
            justify_self: JustifySelf::End,
            ..default()
        },
    ));

    // Tooltip
    commands.spawn((
        DebuggingState::On,
        Text("Tooltip Placeholder".into()),
        TextColor(WHITE.into()),
        SyncResource::<ToolTip>::default(),
        BackgroundColor(BLACK.with_alpha(0.9).into()),
        GlobalZIndex(i32::MAX),
        Node {
            position_type: PositionType::Absolute,
            margin: UiRect {
                left: Val::Px(20.0),
                ..default()
            },
            align_content: AlignContent::Center,
            justify_content: JustifyContent::Center,
            ..default()
        },
    ));
}

/// Toggles the debug state from off -> on // off -> on when triggered
fn toggle_debug_state(
    mut next: ResMut<NextState<DebuggingState>>,
    curr: Res<State<DebuggingState>>,
) {
    use DebuggingState::*;

    next.set(match curr.get() {
        On => Off,
        Off => On,
    });
    info!("Toggling debug state: {:?} -> {:?}", curr, next);
}

/// Simple system that enables/disables rapier debug visuals when the debugging state changes
#[cfg(not(target_arch = "wasm32"))]
fn toggle_rapier_debug_render(
    state: Res<State<DebuggingState>>,
    mut context: ResMut<DebugRenderContext>,
) {
    context.enabled = *state.get() == DebuggingState::On;
}

/// Add a generic Tooltip that follows the mouse in debug mode
#[derive(Default, Resource)]
pub struct ToolTip(HashMap<String, String>);

impl ToolTip {
    pub fn insert(&mut self, k: &str, v: String) {
        self.0.insert(k.into(), v);
    }

    pub fn remove(&mut self, k: &str) {
        self.0.remove(k);
    }
}

impl Display for ToolTip {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        for (k, v) in self.0.iter() {
            writeln!(f, "{k}: {v}")?
        }
        Ok(())
    }
}

fn tooltip_follow(
    mut tooltip: Single<(&mut Node, &mut Visibility), With<SyncResource<ToolTip>>>,
    window: Single<&Window>,
) {
    if let Some(Vec2 { x, y }) = window.cursor_position() {
        *tooltip.1 = Visibility::Inherited;
        tooltip.0.left = Val::Px(x);
        tooltip.0.top = Val::Px(y);
    } else {
        *tooltip.1 = Visibility::Hidden;
    }
}

/// When you hover over a mesh, update the tooltip with some info
fn hover_mesh(
    mut over_events: EventReader<Pointer<Over>>,
    mut out_events: EventReader<Pointer<Out>>,
    mut tooltip: ResMut<ToolTip>,
    meshes: Query<(&Transform, Option<&Name>), With<Mesh3d>>,
) {
    out_events
        .read()
        .filter_map(|Pointer { target, .. }| meshes.contains(*target).then_some(*target))
        .for_each(|_| {
            tooltip.remove("ID");
            tooltip.remove("Pos");
            tooltip.remove("Name");
        });
    over_events
        .read()
        .filter_map(|Pointer { target, .. }| meshes.contains(*target).then_some(*target))
        .for_each(|e| {
            if let Ok((t, n)) = meshes.get(e) {
                let pos = (t.translation.x, t.translation.y, t.translation.z);
                let name = match n {
                    Some(x) => x,
                    None => "N/A",
                };
                tooltip.insert("ID", format!("{e}"));
                tooltip.insert("Pos", format!("{pos:.3?}"));
                tooltip.insert("Name", name.into());
            } else {
                warn!("Failed to query data");
            }
        });
}

fn hover_ui(
    mut over_events: EventReader<Pointer<Over>>,
    mut out_events: EventReader<Pointer<Out>>,
    mut tooltip: ResMut<ToolTip>,
    nodes: Query<Option<&Name>, With<Node>>,
) {
    out_events
        .read()
        .filter_map(|Pointer { target, .. }| nodes.contains(*target).then_some(*target))
        .for_each(|_| {
            tooltip.remove("ID");
            tooltip.remove("Name");
        });
    over_events
        .read()
        .filter_map(|Pointer { target, .. }| nodes.contains(*target).then_some(*target))
        .for_each(|e| {
            if let Ok(n) = nodes.get(e) {
                let name = match n {
                    Some(x) => x,
                    None => "N/A",
                };
                tooltip.insert("ID", format!("{e}"));
                tooltip.insert("Name", name.into());
            } else {
                warn!("Failed to query data");
            }
        });
}

#[cfg(not(target_arch = "wasm32"))]
fn enable_wireframe(mut wireframe_config: ResMut<WireframeConfig>) {
    wireframe_config.global = true;
}

#[cfg(not(target_arch = "wasm32"))]
fn disable_wireframe(mut wireframe_config: ResMut<WireframeConfig>) {
    wireframe_config.global = false;
}

// Toggle the light gizmo config group
fn toggle_light_gizmo(
    state: Res<State<DebuggingState>>,
    mut config_store: ResMut<GizmoConfigStore>,
) {
    let (_, light_group) = config_store.config_mut::<LightGizmoConfigGroup>();
    light_group.draw_all = *state.get() == DebuggingState::On;
}

// Toggle the aabb gizmo config group
fn toggle_aabb_gizmo(
    state: Res<State<DebuggingState>>,
    mut config_store: ResMut<GizmoConfigStore>,
) {
    let (_, aabb_group) = config_store.config_mut::<AabbGizmoConfigGroup>();
    aabb_group.draw_all = *state.get() == DebuggingState::On;
}