use std::{collections::HashMap, net::SocketAddr, sync::atomic::AtomicU32};
use nalgebra::Vector2;
use protobuf::SpecialFields;
use starkingdoms_protocol::planet::PlanetType;

use crate::{
    manager::{ClientHandlerMessage, Player},
    module::{AttachedModule, Module},
    planet::Planet,
    SCALE,
};

pub type EntityId = u32;
pub type Entities = HashMap<EntityId, Entity>;
static mut ENTITY_ID_COUNT: AtomicU32 = AtomicU32::new(0);
pub fn get_entity_id() -> EntityId {
    let last_entity_id = unsafe { &ENTITY_ID_COUNT };
    let id = last_entity_id.fetch_add(1, std::sync::atomic::Ordering::AcqRel);
    assert!(id <= 4_147_483_600, "No remaining entity ids");
    id
}

#[derive(Default)]
pub struct EntityHandler {
    pub entities: Entities,
}

impl EntityHandler {
    pub fn new() -> Self {
        Self {
            entities: Entities::new(),
        }
    }
    pub fn get_planets(&self) -> Vec<Planet> {
        let mut ids = Vec::new();
        for entity in self.entities.values() {
            if let Entity::Planet(planet) = entity {
                ids.push(planet.clone());
            }
        }
        ids
    }
    pub fn get_planet(&self, planet_type: PlanetType) -> Option<Planet> {
        self.get_planets().iter().find(|u| u.planet_type == planet_type).cloned()
    }
    pub fn get_planet_id(&self, planet_type: PlanetType) -> Option<EntityId> {
        for (id, entity) in &self.entities {
            if let Entity::Planet(planet) = entity {
                if planet.planet_type == planet_type {
                    return Some(*id);
                }
            }
        }
        None
    }

    pub fn get_players(&self) -> Vec<(SocketAddr, Player)> {
        let mut players = Vec::new();
        for entity in self.entities.values() {
            if let Entity::Player(player) = entity {
                players.push((player.addr, player.clone()));
            }
        }
        players
    }
    pub fn get_player_from_id(&self, id: EntityId) -> Option<Player> {
        if let Some(Entity::Player(player)) = self.entities.get(&id) {
            Some(player.clone())
        } else {
            None
        }
    }
    pub fn get_player_id(&self, addr: SocketAddr) -> Option<EntityId> {
        for (id, entity) in &self.entities {
            if let Entity::Player(player) = entity {
                if player.addr == addr {
                    return Some(*id);
                }
            }
        }
        None
    }
    pub fn get_player(&self, addr: SocketAddr) -> Option<Player> {
        let players = self.get_players();
        let player = players.iter().find(|p| p.0 == addr);
        player.map(|p| p.1.clone())
    }
    pub fn get_modules(&self) -> Vec<Module> {
        let mut modules = Vec::new();
        for entity in self.entities.values() {
            if let Entity::Module(module) = entity {
                modules.push(module.clone());
            }
        }
        modules
    }
    pub fn get_modules_id(&self) -> Vec<(EntityId, Module)> {
        let mut modules = Vec::new();
        for (id, entity) in self.entities.clone() {
            if let Entity::Module(module) = entity {
                modules.push((id, module.clone()));
            }
        }
        modules
    }
    pub fn get_module_count(&self) -> u32 {
        let mut module_count = 0;
        for entity in self.entities.values() {
            if let Entity::Module(_module) = entity {
                module_count += 1;
            }
        }
        module_count
    }
    pub fn get_module_from_id(&self, id: EntityId) -> Option<Module> {
        if let Some(Entity::Module(module)) = self.entities.get(&id) {
            return Some(module.clone());
        }
        None
    }
    pub fn get_from_module(&self, p_module: &Module) -> Option<EntityId> {
        for (id, entity) in &self.entities {
            if let Entity::Module(module) = entity {
                if module.handle == p_module.handle {
                    return Some(*id);
                }
            }
        }
        None
    }
    pub fn get_all_attached(&self) -> Vec<AttachedModule> {
        let mut modules = Vec::new();
        for entity in self.entities.values() {
            if let Entity::AttachedModule(module) = entity {
                modules.push(module.clone());
            }
        }
        modules
    }
    pub fn get_all_attached_id(&self) -> Vec<(EntityId, AttachedModule)> {
        let mut modules = Vec::new();
        for (id, entity) in self.entities.clone() {
            if let Entity::AttachedModule(module) = entity {
                modules.push((id, module.clone()));
            }
        }
        modules
    }
    pub fn get_attached_from_id(&self, id: EntityId) -> Option<AttachedModule> {
        if let Some(Entity::AttachedModule(module)) = self.entities.get(&id) {
            return Some(module.clone());
        }
        None
    }
    pub fn get_id_from_attached(&self, p_module: &AttachedModule) -> Option<EntityId> {
        for (id, entity) in &self.entities {
            if let Entity::AttachedModule(module) = entity {
                if module.handle == p_module.handle {
                    return Some(*id);
                }
            }
        }
        None
    }

    pub fn gravity(&self, position: (f64, f64), mass: f64) -> (f64, f64) {
        let mut direction = Vector2::zeros();
        let planets = self.get_planets();
        for planet in planets {
            let planet_grav = planet.gravity(position, mass);
            direction.x += planet_grav.0;
            direction.y += planet_grav.1;
        }
        (direction.x, direction.y)
    }

    pub fn to_protocol(&self) -> ClientHandlerMessage {
        let mut planets = vec![];

        for planet in self.get_planets() {
            planets.push(starkingdoms_protocol::planet::Planet {
                planet_type: planet.planet_type.into(),
                x: planet.position.0 * SCALE,
                y: planet.position.1 * SCALE,
                radius: planet.radius * SCALE, // DO NOT * SCALE. THIS VALUE IS NOT SCALED! YES IT IS
                special_fields: SpecialFields::default(),
            });
        }

        ClientHandlerMessage::PlanetData { planets }
    }
}

#[derive(Clone, Debug)]
pub enum Entity {
    Player(Player),
    Planet(Planet),
    Module(Module),
    AttachedModule(AttachedModule),
}