use std::net::TcpStream;
use std::time::{Instant};


use serde_cbor::{from_slice};
use uuid::Uuid;
use failure::Error;
use failure::err_msg;

use ws::{Ws};
use pg::{Db};
use construct::{Construct};
use game::{Game, game_state, game_skill, game_ready};
use account::{Account, account_constructs, account_instances};
use skill::{Skill, dev_resolve, Resolutions};
use instance::{Instance, instance_state, instance_list, instance_new, instance_ready, instance_join};
use vbox::{vbox_accept, vbox_apply, vbox_discard, vbox_combine, vbox_reclaim, vbox_unequip};
use item::{Item, ItemInfoCtr, item_info};

use mtx;

#[derive(Debug,Clone,Serialize,Deserialize)]
pub enum RpcMessage {
    AccountState(Account),
    AccountConstructs(Vec<Construct>),
    AccountInstances(Vec<Instance>),
    AccountShop(mtx::Shop),
    GameState(Game),
    ItemInfo(ItemInfoCtr),

    OpenInstances(Vec<Instance>),
    InstanceState(Instance),

    Pong(()),

    DevResolutions(Resolutions),
}

#[derive(Debug,Clone,Serialize,Deserialize)]
enum RpcRequest {
    Ping {},
    ItemInfo {},
    DevResolve { a: Uuid, b: Uuid, skill: Skill },

    MtxConstructApply { mtx: mtx::MtxVariant, construct_id: Uuid, name: String },
    MtxAccountApply { mtx: mtx::MtxVariant },
    MtxBuy { mtx: mtx::MtxVariant },

    GameState { id: Uuid },
    GameReady { id: Uuid },
    GameSkill { game_id: Uuid, construct_id: Uuid, target_construct_id: Option<Uuid>, skill: Skill },

    AccountState {},
    AccountShop {},
    AccountConstructs {},

    InstanceList {},
    InstanceLobby { construct_ids: Vec<Uuid>, name: String, pve: bool, password: Option<String> },
    InstanceJoin { instance_id: Uuid, construct_ids: Vec<Uuid> },
    InstanceReady { instance_id: Uuid },
    InstanceState { instance_id: Uuid },

    VboxAccept { instance_id: Uuid, group: usize, index: usize },
    VboxDiscard { instance_id: Uuid },
    VboxCombine { instance_id: Uuid, indices: Vec<usize> },
    VboxApply { instance_id: Uuid, construct_id: Uuid, index: usize },
    VboxUnequip { instance_id: Uuid, construct_id: Uuid, target: Item },
    VboxReclaim { instance_id: Uuid, index: usize },
}

pub fn receive(data: Vec<u8>, db: &Db, _client: &mut Ws, begin: Instant, account: &Option<Account>) -> Result<RpcMessage, Error> {
    // cast the msg to this type to receive method name
    match from_slice::<RpcRequest>(&data) {
        Ok(v) => {

            // non authenticated
            // non transactional reqs
            match v {
                RpcRequest::Ping {} => return Ok(RpcMessage::Pong(())),
                RpcRequest::ItemInfo {} => return Ok(RpcMessage::ItemInfo(item_info())),
                RpcRequest::DevResolve {a, b, skill } =>
                    return Ok(RpcMessage::DevResolutions(dev_resolve(a, b, skill))),
                _ => (),
            };

            // check for authorization now
            let account = match account {
                Some(account) => account,
                None => return Err(err_msg("auth required")),
            };

            // all good, let's make a tx and process
            let mut tx = db.transaction()?;

            let request = v.clone();

            let response = match v {
                RpcRequest::AccountState {} =>
                    return Ok(RpcMessage::AccountState(account.clone())),
                RpcRequest::AccountConstructs {} =>
                    Ok(RpcMessage::AccountConstructs(account_constructs(&mut tx, &account)?)),

                // RpcRequest::AccountShop {} =>
                //     Ok(RpcMessage::AccountShop(mtx::account_shop(&mut tx, &account)?)),



                // RpcRequest::ConstructDelete" => handle_construct_delete(data, &mut tx, account),

                RpcRequest::GameState { id } =>
                    Ok(RpcMessage::GameState(game_state(&mut tx, account, id)?)),

                RpcRequest::GameSkill { game_id, construct_id, target_construct_id, skill } =>
                    Ok(RpcMessage::GameState(game_skill(&mut tx, account, game_id, construct_id, target_construct_id, skill)?)),

                RpcRequest::GameReady { id } =>
                    Ok(RpcMessage::GameState(game_ready(&mut tx, account, id)?)),

                RpcRequest::InstanceList {} =>
                    Ok(RpcMessage::OpenInstances(instance_list(&mut tx)?)),
                RpcRequest::InstanceLobby { construct_ids, name, pve, password } =>
                    Ok(RpcMessage::InstanceState(instance_new(&mut tx, account, construct_ids, name, pve, password)?)),
                RpcRequest::InstanceJoin { instance_id, construct_ids } =>
                    Ok(RpcMessage::InstanceState(instance_join(&mut tx, account, instance_id, construct_ids)?)),

                // these two can return GameState or InstanceState
                RpcRequest::InstanceReady { instance_id } =>
                    Ok(instance_ready(&mut tx, account, instance_id)?),
                RpcRequest::InstanceState { instance_id } =>
                    Ok(instance_state(&mut tx, account, instance_id)?),

                RpcRequest::VboxAccept { instance_id, group, index } =>
                    Ok(RpcMessage::InstanceState(vbox_accept(&mut tx, account, instance_id, group, index)?)),

                RpcRequest::VboxApply { instance_id, construct_id, index } =>
                    Ok(RpcMessage::InstanceState(vbox_apply(&mut tx, account, instance_id, construct_id, index)?)),

                RpcRequest::VboxCombine { instance_id, indices } =>
                    Ok(RpcMessage::InstanceState(vbox_combine(&mut tx, account, instance_id, indices)?)),

                RpcRequest::VboxDiscard { instance_id } =>
                    Ok(RpcMessage::InstanceState(vbox_discard(&mut tx, account, instance_id)?)),

                RpcRequest::VboxReclaim { instance_id, index } =>
                    Ok(RpcMessage::InstanceState(vbox_reclaim(&mut tx, account, instance_id, index)?)),

                RpcRequest::VboxUnequip { instance_id, construct_id, target } =>
                    Ok(RpcMessage::InstanceState(vbox_unequip(&mut tx, account, instance_id, construct_id, target)?)),


                RpcRequest::MtxConstructApply { mtx, construct_id, name } =>
                    Ok(RpcMessage::AccountConstructs(mtx::apply(&mut tx, account, mtx, construct_id, name)?)),

                RpcRequest::MtxBuy { mtx } =>
                    Ok(RpcMessage::AccountShop(mtx::buy(&mut tx, account, mtx)?)),

                _ => Err(format_err!("unknown request request={:?}", request)),
            };

            tx.commit()?;

            info!("request={:?} account={:?} duration={:?}", request, account.name, begin.elapsed());

            return response;
        },
        Err(e) => {
            warn!("{:?}", e);
            Err(err_msg("invalid message"))
        },
    }
}