use crate::server::entity_map::*;
use crate::shared::buffs::*;
use crate::shared::player::*;
use crate::shared::*;
use bevy::ecs::system::*;

#[derive(Bundle)]
pub struct AreaOfEffectBundle {
    area_of_effect: AreaOfEffect,
    replicate: Replicate,
}

impl AreaOfEffectBundle {
    pub fn new(area_of_effect: AreaOfEffect) -> Self {
        AreaOfEffectBundle {
            area_of_effect,
            replicate: Replicate::default(),
        }
    }
}

#[derive(Component, Message, Serialize, Deserialize, Clone, PartialEq, Debug)]
pub struct AreaOfEffect {
    pub position: Vec2,
    pub radius: f32,
    // `duration = None` means `AreaOfEffect` exists only for a single server tick
    pub duration: Option<f32>,
    pub source_player: PlayerId,
    pub area_of_effect_type: AreaOfEffectType,
}

#[derive(Component, Message, Serialize, Deserialize, Clone, PartialEq, Debug)]
pub enum AreaOfEffectType {
    Slow,
}

pub type AreaOfEffectActivation = Box<dyn FnOnce(&mut Commands, PlayerId, PlayerId) -> ()>;

impl AreaOfEffect {
    pub fn activate(&self) -> AreaOfEffectActivation {
        match self.area_of_effect_type {
            AreaOfEffectType::Slow => Box::new(
                move |commands: &mut Commands,
                      _source_player_id: PlayerId,
                      target_player_id: PlayerId| {
                    commands.add(move |world: &mut World| {
                        world.run_system_once(
                            move |entity_map: Res<EntityMap>, mut buffs: Query<&mut Buffs>| {
                                let Some(target_entity) = entity_map.0.get(&target_player_id.0)
                                else {
                                    return;
                                };
                                let Ok(mut buffs) = buffs.get_mut(*target_entity) else {
                                    return;
                                };
                                buffs.slow = Some(0.75);
                            },
                        )
                    })
                },
            ),
        }
    }
}