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use super::*;
use amethyst_core::bundle::{Result, SystemBundle};
use amethyst_core::specs::prelude::DispatcherBuilder;
use std::hash::Hash;
use std::marker::PhantomData;

/// The bundle that creates a flying movement system.
/// Note: Will not actually create a moving entity. It will only register the needed resources and systems.
/// The generic parameters A and B are the ones used in InputHandler<A,B>.
/// You might want to add "fly_movement" and "free_rotation" as dependencies of the TransformSystem.
/// Adding this bundle will grab the mouse, hide it and keep it centered.
pub struct FlyControlBundle<A, B> {
    sensitivity_x: f32,
    sensitivity_y: f32,
    speed: f32,
    right_input_axis: Option<A>,
    up_input_axis: Option<A>,
    forward_input_axis: Option<A>,
    _marker: PhantomData<B>,
}

impl<A, B> FlyControlBundle<A, B> {
    pub fn new(
        right_input_axis: Option<A>,
        up_input_axis: Option<A>,
        forward_input_axis: Option<A>,
    ) -> Self {
        FlyControlBundle {
            sensitivity_x: 1.0,
            sensitivity_y: 1.0,
            speed: 1.0,
            right_input_axis,
            up_input_axis,
            forward_input_axis,
            _marker: PhantomData,
        }
    }
    pub fn with_sensitivity(mut self, x: f32, y: f32) -> Self {
        self.sensitivity_x = x;
        self.sensitivity_y = y;
        self
    }
    pub fn with_speed(mut self, speed: f32) -> Self {
        self.speed = speed;
        self
    }
}

impl<'a, 'b, A, B> SystemBundle<'a, 'b> for FlyControlBundle<A, B>
where
    A: Send + Sync + Hash + Eq + Clone + 'static,
    B: Send + Sync + Hash + Eq + Clone + 'static,
{
    fn build(self, builder: &mut DispatcherBuilder<'a, 'b>) -> Result<()> {
        builder.add(
            FlyMovementSystem::<A, B>::new(
                self.speed,
                self.right_input_axis,
                self.up_input_axis,
                self.forward_input_axis,
            ),
            "fly_movement",
            &[],
        );
        builder.add(
            FreeRotationSystem::<A, B>::new(self.sensitivity_x, self.sensitivity_y),
            "free_rotation",
            &[],
        );
        builder.add(
            MouseFocusUpdateSystem::new(),
            "mouse_focus",
            &["free_rotation"],
        );
        builder.add(MouseCenterLockSystem, "mouse_lock", &["mouse_focus"]);
        Ok(())
    }
}