use async_std::channel::Sender;
use async_std::sync::RwLock;

use rapier2d_f64::na::Vector2;
use rapier2d_f64::prelude::{
    BroadPhase, CCDSolver, ColliderSet, ImpulseJointSet, IntegrationParameters, IslandManager,
    MultibodyJointSet, NarrowPhase, PhysicsPipeline, RigidBodyHandle, RigidBodySet,
};
use starkingdoms_protocol::api::APISavedPlayerData;

use std::collections::HashMap;

use std::net::SocketAddr;
use std::sync::Arc;

use crate::entity::{Entity, EntityHandler, EntityId};

use crate::module::{AttachedModule, Attachment};

#[derive(Clone)]
pub struct ClientManager {
    pub handlers: Arc<RwLock<HashMap<SocketAddr, ClientHandler>>>,
    pub usernames: Arc<RwLock<HashMap<SocketAddr, String>>>,
}

#[derive(Clone, Debug)]
pub struct Player {
    pub handle: RigidBodyHandle,
    pub input: PlayerInput,
    pub addr: SocketAddr,
    pub auth_token: Option<String>,
    pub auth_user: Option<String>,
    pub children: [Option<Attachment>; 4],
}

impl Player {
    #[allow(clippy::missing_const_for_fn)] // This will eventually do something, but for now it doesn't
    pub fn as_api_data(&self) -> APISavedPlayerData {
        APISavedPlayerData {}
    }

    pub fn load_api_data(&mut self, _data: &APISavedPlayerData) {}
    pub fn search_modules(&self, entities: &EntityHandler) -> Vec<AttachedModule> {
        let mut modules = Vec::new();
        for attachment in self.children.iter().flatten() {
            if let Some(Entity::AttachedModule(child_module)) =
                entities.entities.get(&attachment.child)
            {
                modules.append(&mut child_module.search_modules(entities));
            }
        }
        modules
    }
    pub fn find_parent(
        &self,
        module: &AttachedModule,
        entities: &EntityHandler,
    ) -> Option<(u8, EntityId)> {
        for (slot, attachment) in self.children.iter().enumerate() {
            if let Some(attachment) = attachment {
                if let Entity::AttachedModule(child_module) =
                    entities.entities.get(&attachment.child)?
                {
                    if *child_module == *module {
                        return Some((
                            u8::try_from(slot).ok()?,
                            entities.get_player_id(self.addr)?,
                        ));
                    }
                    let parent = child_module.find_parent(module, entities);
                    if parent.is_some() {
                        return parent;
                    }
                }
            }
        }
        None
    }
}

#[derive(Default, Clone, Debug)]
#[allow(clippy::struct_excessive_bools)]
pub struct PlayerInput {
    pub up: bool,
    pub left: bool,
    pub right: bool,
    pub down: bool,
}

#[derive(Clone)]
pub struct ClientHandler {
    pub tx: Sender<ClientHandlerMessage>,
}

#[derive(Clone, Default)]
pub struct PhysicsData {
    pub gravity: Vector2<f64>,
    pub integration_parameters: IntegrationParameters,
    pub island_manager: IslandManager,
    pub broad_phase: BroadPhase,
    pub narrow_phase: NarrowPhase,
    pub rigid_body_set: RigidBodySet,
    pub collider_set: ColliderSet,
    pub impulse_joint_set: ImpulseJointSet,
    pub multibody_joint_set: MultibodyJointSet,
    pub ccd_solver: CCDSolver,
}
impl PhysicsData {
    pub fn tick(&mut self, pipeline: &mut PhysicsPipeline) {
        pipeline.step(
            &self.gravity,
            &self.integration_parameters,
            &mut self.island_manager,
            &mut self.broad_phase,
            &mut self.narrow_phase,
            &mut self.rigid_body_set,
            &mut self.collider_set,
            &mut self.impulse_joint_set,
            &mut self.multibody_joint_set,
            &mut self.ccd_solver,
            None,
            &(),
            &(),
        );
    }
}

#[derive(Debug, Clone)]
pub enum ClientHandlerMessage {
    Tick,
    ChatMessage {
        from: String,
        message: String,
    },
    PlayersUpdate {
        players: Vec<starkingdoms_protocol::player::Player>,
    },
    PlanetData {
        planets: Vec<starkingdoms_protocol::planet::Planet>,
    },
    ModulesUpdate {
        modules: Vec<starkingdoms_protocol::module::Module>,
    },
    ModuleTreeUpdate {
        modules: Vec<starkingdoms_protocol::module::AttachedModule>,
    },
}