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use crate::{
    interaction::InteractionMode,
    scene::{commands::ChangeSelectionCommand, EditorScene, Selection},
    settings::Settings,
    world::graph::selection::GraphSelection,
    GameEngine, Message,
};
use fyrox::{
    core::{algebra::Vector2, pool::Handle},
    gui::{message::MessageDirection, widget::WidgetMessage, UiNode},
    scene::node::Node,
};
use std::sync::mpsc::Sender;

pub struct SelectInteractionMode {
    preview: Handle<UiNode>,
    selection_frame: Handle<UiNode>,
    message_sender: Sender<Message>,
    stack: Vec<Handle<Node>>,
    click_pos: Vector2<f32>,
}

impl SelectInteractionMode {
    pub fn new(
        preview: Handle<UiNode>,
        selection_frame: Handle<UiNode>,
        message_sender: Sender<Message>,
    ) -> Self {
        Self {
            preview,
            selection_frame,
            message_sender,
            stack: Vec::new(),
            click_pos: Vector2::default(),
        }
    }
}

impl InteractionMode for SelectInteractionMode {
    fn on_left_mouse_button_down(
        &mut self,
        _editor_scene: &mut EditorScene,
        engine: &mut GameEngine,
        mouse_pos: Vector2<f32>,
        _frame_size: Vector2<f32>,
        _settings: &Settings,
    ) {
        self.click_pos = mouse_pos;
        let ui = &mut engine.user_interface;
        ui.send_message(WidgetMessage::visibility(
            self.selection_frame,
            MessageDirection::ToWidget,
            true,
        ));
        ui.send_message(WidgetMessage::desired_position(
            self.selection_frame,
            MessageDirection::ToWidget,
            mouse_pos,
        ));
        ui.send_message(WidgetMessage::width(
            self.selection_frame,
            MessageDirection::ToWidget,
            0.0,
        ));
        ui.send_message(WidgetMessage::height(
            self.selection_frame,
            MessageDirection::ToWidget,
            0.0,
        ));
    }

    fn on_left_mouse_button_up(
        &mut self,
        editor_scene: &mut EditorScene,
        engine: &mut GameEngine,
        _mouse_pos: Vector2<f32>,
        frame_size: Vector2<f32>,
        _settings: &Settings,
    ) {
        let scene = &engine.scenes[editor_scene.scene];
        let camera = scene.graph[editor_scene.camera_controller.camera].as_camera();
        let preview_screen_bounds = engine.user_interface.node(self.preview).screen_bounds();
        let frame_screen_bounds = engine
            .user_interface
            .node(self.selection_frame)
            .screen_bounds();
        let relative_bounds = frame_screen_bounds.translate(-preview_screen_bounds.position);
        self.stack.clear();
        self.stack.push(scene.graph.get_root());
        let mut graph_selection = GraphSelection::default();
        while let Some(handle) = self.stack.pop() {
            let node = &scene.graph[handle];
            if handle == editor_scene.editor_objects_root {
                continue;
            }
            if handle == scene.graph.get_root() {
                self.stack.extend_from_slice(node.children());
                continue;
            }

            for screen_corner in node
                .local_bounding_box()
                .corners()
                .iter()
                .filter_map(|&p| camera.project(p + node.global_position(), frame_size))
            {
                if relative_bounds.contains(screen_corner) {
                    graph_selection.insert_or_exclude(handle);
                    break;
                }
            }

            self.stack.extend_from_slice(node.children());
        }

        let new_selection = Selection::Graph(graph_selection);

        if new_selection != editor_scene.selection {
            self.message_sender
                .send(Message::do_scene_command(ChangeSelectionCommand::new(
                    new_selection,
                    editor_scene.selection.clone(),
                )))
                .unwrap();
        }
        engine
            .user_interface
            .send_message(WidgetMessage::visibility(
                self.selection_frame,
                MessageDirection::ToWidget,
                false,
            ));
    }

    fn on_mouse_move(
        &mut self,
        _mouse_offset: Vector2<f32>,
        mouse_position: Vector2<f32>,
        _camera: Handle<Node>,
        _editor_scene: &mut EditorScene,
        engine: &mut GameEngine,
        _frame_size: Vector2<f32>,
        _settings: &Settings,
    ) {
        let ui = &mut engine.user_interface;
        let width = mouse_position.x - self.click_pos.x;
        let height = mouse_position.y - self.click_pos.y;

        let position = Vector2::new(
            if width < 0.0 {
                mouse_position.x
            } else {
                self.click_pos.x
            },
            if height < 0.0 {
                mouse_position.y
            } else {
                self.click_pos.y
            },
        );
        ui.send_message(WidgetMessage::desired_position(
            self.selection_frame,
            MessageDirection::ToWidget,
            position,
        ));
        ui.send_message(WidgetMessage::width(
            self.selection_frame,
            MessageDirection::ToWidget,
            width.abs(),
        ));
        ui.send_message(WidgetMessage::height(
            self.selection_frame,
            MessageDirection::ToWidget,
            height.abs(),
        ));
    }

    fn update(
        &mut self,
        _editor_scene: &mut EditorScene,
        _camera: Handle<Node>,
        _engine: &mut GameEngine,
    ) {
    }

    fn deactivate(&mut self, _editor_scene: &EditorScene, _engine: &mut GameEngine) {}
}