use std::f32::consts::PI;

use godot::{
    classes::{
        Camera3D, CharacterBody3D, ICharacterBody3D, Input, InputEvent, InputEventMouseMotion,
        input::MouseMode,
    },
    obj::WithBaseField,
    prelude::*,
};

use crate::ui::cli::CommandLinePanel;

pub trait Player: ICharacterBody3D + WithBaseField {
    fn get_y_speed(&self) -> f32;
    fn set_y_speed(&mut self, speed: f32);
    fn get_movement_dir(&self) -> Vector3;
    fn get_move_speed(&self) -> f32;
}

pub trait PlayerMovement {
    fn player_update(&mut self, delta: f64);
    fn jump(&mut self);
}

impl<T: Player + WithBaseField> PlayerMovement for T {
    fn player_update(&mut self, delta: f64) {
        self.set_y_speed(self.get_y_speed() - 9.8 * delta as f32);
        if self.base().is_on_floor() && self.get_y_speed() < 0. {
            self.set_y_speed(0.);
        }

        let speed = Vector3::UP * self.get_y_speed()
            + self
                .get_movement_dir()
                .try_normalized()
                .unwrap_or_default()
                .rotated(Vector3::UP, self.base().get_rotation().y)
                * self.get_move_speed();

        self.base_mut().set_velocity(speed);
        self.base_mut().move_and_slide();
    }

    fn jump(&mut self) {
        self.set_y_speed(5.);
    }
}

#[derive(GodotClass)]
#[class(base=CharacterBody3D, init)]
pub struct LocalPlayer {
    #[export]
    look_sensitivity: f32,
    #[export]
    camera: Option<Gd<Camera3D>>,
    #[export]
    move_speed: f32,

    movement_dir: Vector3,
    y_speed: f32,

    locked: bool,

    base: Base<CharacterBody3D>,
}

impl Player for LocalPlayer {
    fn get_y_speed(&self) -> f32 {
        self.y_speed
    }

    fn set_y_speed(&mut self, speed: f32) {
        self.y_speed = speed;
    }

    fn get_movement_dir(&self) -> Vector3 {
        self.movement_dir
    }

    fn get_move_speed(&self) -> f32 {
        self.move_speed
    }
}

#[godot_api]
impl ICharacterBody3D for LocalPlayer {
    fn ready(&mut self) {
        if !CommandLinePanel::singleton().bind().opened {
            self.set_lock(true);
        }

        CommandLinePanel::singleton()
            .signals()
            .on_open()
            .connect_other(self, |s| s.set_lock(false));
        CommandLinePanel::singleton()
            .signals()
            .on_close()
            .connect_other(self, |s| {
                s.set_lock(true);
            });
    }

    fn process(&mut self, delta: f64) {
        let input_direction = if self.locked {
            let input = Input::singleton();

            if self.base().is_on_floor() && input.is_action_just_pressed("jump") {
                self.jump();
            }

            Vector3::RIGHT * input.is_action_pressed("right") as u32 as f32
                - Vector3::RIGHT * input.is_action_pressed("left") as u32 as f32
                + Vector3::FORWARD * input.is_action_pressed("forward") as u32 as f32
                - Vector3::FORWARD * input.is_action_pressed("backward") as u32 as f32
        } else {
            Vector3::ZERO
        };
        self.movement_dir = input_direction;

        self.player_update(delta);
    }

    fn input(&mut self, event: Gd<InputEvent>) {
        if self.locked {
            if let Ok(event) = event.try_cast::<InputEventMouseMotion>() {
                let x = event.get_relative().x * 0.001 * self.look_sensitivity;
                let y = event.get_relative().y * 0.001 * self.look_sensitivity;

                if let Some(camera) = self.camera.as_mut() {
                    let curr_rotation = camera.get_rotation();
                    let x_rot =
                        (curr_rotation.x - y * self.look_sensitivity).clamp(-PI / 2., PI / 2.);
                    camera.set_rotation(Vector3::RIGHT * x_rot);
                }

                let y_rot = -x * self.look_sensitivity;
                self.base_mut().rotate_y(y_rot);
            }
        }
    }
}

impl LocalPlayer {
    fn set_lock(&mut self, locked: bool) {
        self.locked = locked;
        if self.locked {
            Input::singleton().set_mouse_mode(MouseMode::CAPTURED);
        } else {
            Input::singleton().set_mouse_mode(MouseMode::VISIBLE);
        }
    }
}