use std::convert::{From, TryFrom, Into};
use futures::{Future, TryStreamExt};
use async_std::stream::StreamExt;
use libpso::character::guildcard;
use crate::entity::account::*;
use crate::entity::character::*;
use crate::entity::gateway::{EntityGateway, EntityGatewayTransaction, GatewayError};
use crate::entity::item::*;
use super::models::*;

use sqlx::postgres::PgPoolOptions;
use sqlx::Connection;


mod embedded {
    use refinery::embed_migrations;
    embed_migrations!("src/entity/gateway/postgres/migrations");
}


pub struct PostgresTransaction<'t> {
    pgtransaction: sqlx::Transaction<'t, sqlx::Postgres>,
}


#[async_trait::async_trait]
impl<'t> EntityGatewayTransaction for PostgresTransaction<'t> {
    fn gateway(&mut self) -> &mut dyn EntityGateway {
        self
    }

    async fn commit(self: Box<Self>) -> Result<(), GatewayError> {
        self.pgtransaction.commit().await?;
        Ok(())
    }
}


#[derive(Clone)]
pub struct PostgresGateway {
    pool: sqlx::Pool<sqlx::Postgres>,
}

impl PostgresGateway {
    pub fn new(host: &str, dbname: &str, username: &str, password: &str) -> PostgresGateway {
        let mut conn = refinery::config::Config::new(refinery::config::ConfigDbType::Postgres)
            .set_db_host(host)
            .set_db_user(username)
            .set_db_pass(password)
            .set_db_name(dbname);
        embedded::migrations::runner().run(&mut conn).unwrap();

        let pool = async_std::task::block_on(async move {
            PgPoolOptions::new()
                .max_connections(5)
                .connect(&format!("postgresql://{}:{}@{}:5432/{}", username, password, host, dbname)).await.unwrap()
        });

        PostgresGateway {
            pool,
        }
    }
}


// TODO: remove unwraps, return Result
async fn apply_item_modifications(conn: &mut sqlx::PgConnection, item: ItemEntity) -> ItemEntity
{
    let ItemEntity {id, item} = item;

    let item = match item {
        ItemDetail::Weapon(mut weapon) => {
            let q = r#"select weapon, modifier
                           from weapon_modifier
                           where weapon = $1
                           order by created_at"#;
            let weapon_modifiers = sqlx::query_as::<_, PgWeaponModifier>(q)
                .bind(id.0 as i32)
                .fetch(conn);

            weapon_modifiers.for_each(|modifier| {
                if let Ok(modifier) = modifier {
                    weapon.apply_modifier(&modifier.modifier);
                }
            }).await;

            ItemDetail::Weapon(weapon)
        },
        ItemDetail::Mag(mut mag) => {
            let q = r#"select mag, modifier, item.item -> 'Tool' as feed, item2.item -> 'Tool' as cell
                           from mag_modifier
                           left join item on item.id = cast (modifier ->> 'FeedMag' as integer)
                           left join item as item2 on item2.id = cast (modifier ->> 'MagCell' as integer)
                           where mag = $1 order by created_at"#;
            let mag_modifiers = sqlx::query_as::<_, PgMagModifierWithParameters>(q)
                .bind(id.0 as i32)
                .fetch(conn);

            mag_modifiers.for_each(|modifier| {
                let PgMagModifierWithParameters {modifier, feed, cell, ..} = modifier.unwrap();
                let modifier: mag::MagModifier = modifier.0.into();
                match modifier {
                    mag::MagModifier::FeedMag{..} => {
                        mag.feed(feed.unwrap().tool)
                    },
                    mag::MagModifier::BankMag => {
                        mag.bank()
                    },
                    mag::MagModifier::MagCell(_) => {
                        mag.apply_mag_cell(mag::MagCell::try_from(Into::<tool::Tool>::into(cell.unwrap().0).tool).unwrap()).unwrap()
                    },
                    mag::MagModifier::OwnerChange(class, section_id) => {
                        mag.change_owner(class, section_id)
                    },
                }
            }).await;

            ItemDetail::Mag(mag)
        },
        item => item
    };

    ItemEntity {
        id,
        item,
    }
}

async fn create_user(conn: &mut sqlx::PgConnection, user: NewUserAccountEntity) -> Result<UserAccountEntity, GatewayError>
{
    let new_user = sqlx::query_as::<_, PgUserAccount>("insert into user_accounts (email, username, password, activated) values ($1, $2, $3, $4) returning *;")
        .bind(user.email)
        .bind(user.username)
        .bind(user.password)
        .bind(user.activated)
        .fetch_one(conn).await?;
    Ok(new_user.into())
}

async fn get_user_by_id(conn: &mut sqlx::PgConnection, id: UserAccountId) -> Result<UserAccountEntity, GatewayError>
{
    let user = sqlx::query_as::<_, PgUserAccount>("select * from user_accounts where id = $1")
        .bind(id.0)
        .fetch_one(conn).await?;
    Ok(user.into())
}

async fn get_user_by_name(conn: &mut sqlx::PgConnection, username: String) -> Result<UserAccountEntity, GatewayError>
{
    let user = sqlx::query_as::<_, PgUserAccount>("select * from user_accounts where username = $1")
        .bind(username)
        .fetch_one(conn).await?;
    Ok(user.into())
}


async fn save_user(conn: &mut sqlx::PgConnection, user: &UserAccountEntity) -> Result<(), GatewayError>
{
    sqlx::query("UPDATE user_accounts set username=$1, password=$2, banned=$3, muted=$4, flags=$5 where id=$6")
        .bind(&user.username)
        .bind(&user.password)
        .bind(&user.banned_until)
        .bind(&user.muted_until)
        .bind(&user.flags)
        .bind(&user.id.0)
        .execute(conn).await?;
    Ok(())
}

async fn create_user_settings(conn: &mut sqlx::PgConnection, settings: NewUserSettingsEntity) -> Result<UserSettingsEntity, GatewayError>
{
    let new_settings = sqlx::query_as::<_, PgUserSettings>("insert into user_settings (user_account, blocked_users, key_config, joystick_config, option_flags, shortcuts, symbol_chats, team_name)
                                                            values ($1, $2, $3, $4, $5, $6, $7, $8) returning *;")
        .bind(settings.user_id.0)
        .bind(settings.settings.blocked_users.iter().copied().flat_map(|i| i.to_le_bytes().to_vec()).collect::<Vec<u8>>())
        .bind(settings.settings.keyboard_config.to_vec())
        .bind(settings.settings.gamepad_config.to_vec())
        .bind(settings.settings.option_flags as i32)
        .bind(settings.settings.shortcuts.to_vec())
        .bind(settings.settings.symbol_chats.to_vec())
        .bind(settings.settings.team_name.iter().copied().flat_map(|i| i.to_le_bytes().to_vec()).collect::<Vec<u8>>())
        .fetch_one(conn).await?;
    Ok(new_settings.into())
}

async fn get_user_settings_by_user(conn: &mut sqlx::PgConnection, user: &UserAccountEntity) -> Result<UserSettingsEntity, GatewayError>
{
    let settings = sqlx::query_as::<_, PgUserSettings>("select * from user_settings where user_account = $1")
        .bind(user.id.0)
        .fetch_one(conn).await?;
    Ok(settings.into())
}

async fn save_user_settings(conn: &mut sqlx::PgConnection, settings: &UserSettingsEntity) -> Result<(), GatewayError>
{
    sqlx::query("update user_settings set blocked_users=$1, key_config=$2, joystick_config=$3, option_flags=$4, shortcuts=$5, symbol_chats=$6, team_name=$7 where id=$8")
        .bind(settings.settings.blocked_users.iter().copied().flat_map(|i| i.to_le_bytes().to_vec()).collect::<Vec<u8>>())
        .bind(&settings.settings.keyboard_config.to_vec())
        .bind(&settings.settings.gamepad_config.to_vec())
        .bind(&settings.settings.option_flags)
        .bind(&settings.settings.shortcuts.to_vec())
        .bind(&settings.settings.symbol_chats.to_vec())
        .bind(settings.settings.team_name.iter().copied().flat_map(|i| i.to_le_bytes().to_vec()).collect::<Vec<u8>>())
        .bind(&settings.id.0)
        .fetch_one(conn).await?;
    Ok(())
}

async fn create_character(conn: &mut sqlx::PgConnection, char: NewCharacterEntity) -> Result<CharacterEntity, GatewayError>
{
    let q = r#"insert into player_character
              (user_account, slot, name, exp, class, section_id, costume, skin, face, head, hair, hair_r, hair_g, hair_b, prop_x, prop_y, techs,
               config, infoboard, guildcard, power, mind, def, evade, luck, hp, tp, tech_menu, option_flags)
              values
              ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31)
              returning *;"#;
    let character = sqlx::query_as::<_, PgCharacter>(q)
        .bind(char.user_id.0)
        .bind(char.slot as i16)
        .bind(char.name)
        .bind(char.exp as i32)
        .bind(char.char_class.to_string())
        .bind(char.section_id.to_string())
        .bind(char.appearance.costume as i16)
        .bind(char.appearance.skin as i16)
        .bind(char.appearance.face as i16)
        .bind(char.appearance.head as i16)
        .bind(char.appearance.hair as i16)
        .bind(char.appearance.hair_r as i16)
        .bind(char.appearance.hair_g as i16)
        .bind(char.appearance.hair_b as i16)
        .bind(char.appearance.prop_x)
        .bind(char.appearance.prop_y)
        .bind(&char.techs.as_bytes().to_vec())
        .bind(&char.config.as_bytes().to_vec())
        .bind(String::from_utf16_lossy(&char.info_board.board).trim_matches(char::from(0)))
        .bind(char.guildcard.description)
        .bind(char.materials.power as i16)
        .bind(char.materials.mind as i16)
        .bind(char.materials.def as i16)
        .bind(char.materials.evade as i16)
        .bind(char.materials.luck as i16)
        .bind(char.materials.hp as i16)
        .bind(char.materials.tp as i16)
        .bind(char.tech_menu.tech_menu.to_vec())
        .bind(char.option_flags as i32)
        .fetch_one(conn).await?;

    Ok(character.into())
}

async fn get_characters_by_user(conn: &mut sqlx::PgConnection, user: &UserAccountEntity) -> Result<[Option<CharacterEntity>; 4], GatewayError>
{
    let mut stream = sqlx::query_as::<_, PgCharacter>("select * from player_character where user_account = $1 and slot < 4 order by slot")
        .bind(user.id.0)
        .fetch(conn);
    const NONE: Option<CharacterEntity> = None;
    let mut result = [NONE; 4];
    while let Some(character) = stream.try_next().await? {
        let index = character.slot as usize;
        result[index] = Some(character.into())
    }

    Ok(result)
}

async fn save_character(conn: &mut sqlx::PgConnection, char: &CharacterEntity) -> Result<(), GatewayError>
{
    let q = r#"update player_character set
                   user_account=$1, slot=$2, name=$3, exp=$4, class=$5, section_id=$6, costume=$7, skin=$8, face=$9, head=$10, hair=$11, hair_r=$12,
                   hair_g=$13, hair_b=$14, prop_x=$15, prop_y=$16, techs=$17, config=$18, infoboard=$19, guildcard=$20, power=$21, mind=$22, def=$23,
                   evade=$24, luck=$25, hp=$26, tp=$27, tech_menu=$28, option_flags=$29
                   where id=$32;"#;
    sqlx::query(q)
        .bind(char.user_id.0)
        .bind(char.slot as i16)
        .bind(&char.name)
        .bind(char.exp as i32)
        .bind(char.char_class.to_string())
        .bind(char.section_id.to_string())
        .bind(char.appearance.costume as i16)
        .bind(char.appearance.skin as i16)
        .bind(char.appearance.face as i16)
        .bind(char.appearance.head as i16)
        .bind(char.appearance.hair as i16)
        .bind(char.appearance.hair_r as i16)
        .bind(char.appearance.hair_g as i16)
        .bind(char.appearance.hair_b as i16)
        .bind(char.appearance.prop_x)
        .bind(char.appearance.prop_y)
        .bind(&char.techs.as_bytes().to_vec())
        .bind(&char.config.as_bytes().to_vec())
        .bind(String::from_utf16_lossy(&char.info_board.board).trim_matches(char::from(0)))
        .bind(&char.guildcard.description)
        .bind(char.materials.power as i16)
        .bind(char.materials.mind as i16)
        .bind(char.materials.def as i16)
        .bind(char.materials.evade as i16)
        .bind(char.materials.luck as i16)
        .bind(char.materials.hp as i16)
        .bind(char.materials.tp as i16)
        .bind(char.tech_menu.tech_menu.to_vec())
        .bind(char.option_flags as i32)
        .bind(char.id.0 as i32)
        .execute(conn).await?;
    Ok(())
}

async fn create_item(conn: &mut sqlx::PgConnection, item: NewItemEntity) -> Result<ItemEntity, GatewayError>
{
    let new_item = sqlx::query_as::<_, PgItem>("insert into item (item) values ($1) returning *;")
        .bind(sqlx::types::Json(PgItemDetail::from(item.item)))
        .fetch_one(conn).await?;

    Ok(ItemEntity {
        id: ItemEntityId(new_item.id as u32),
        item: new_item.item.0.into(),
    })
}

async fn add_item_note(conn: &mut sqlx::PgConnection, item_id: &ItemEntityId, item_note: ItemNote) -> Result<(), GatewayError>
{
    sqlx::query("insert into item_note(item, note) values ($1, $2)")
        .bind(item_id.0)
        .bind(sqlx::types::Json(PgItemNoteDetail::from(item_note)))
        .execute(conn).await?;
    Ok(())
}

async fn feed_mag(conn: &mut sqlx::PgConnection, mag_item_id: &ItemEntityId, tool_item_id: &ItemEntityId) -> Result<(), GatewayError>
{
    sqlx::query("insert into mag_modifier (mag, modifier) values ($1, $2);")
        .bind(mag_item_id.0)
        .bind(sqlx::types::Json(PgMagModifierDetail::from(mag::MagModifier::FeedMag{food: *tool_item_id})))
        .execute(conn).await?;
    Ok(())
}

async fn change_mag_owner(conn: &mut sqlx::PgConnection, mag_item_id: &ItemEntityId, character: &CharacterEntity) -> Result<(), GatewayError>
{
    sqlx::query("insert into mag_modifier (mag, modifier) values ($1, $2);")
        .bind(mag_item_id.0)
        .bind(sqlx::types::Json(PgMagModifierDetail::from(mag::MagModifier::OwnerChange(character.char_class, character.section_id))))
        .execute(conn).await?;
    Ok(())
}

async fn use_mag_cell(conn: &mut sqlx::PgConnection, mag_item_id: &ItemEntityId, mag_cell_id: &ItemEntityId) -> Result<(), GatewayError>
{
    sqlx::query("insert into mag_modifier (mag, modifier) values ($1, $2);")
        .bind(mag_item_id.0)
        .bind(sqlx::types::Json(PgMagModifierDetail::from(mag::MagModifier::MagCell(*mag_cell_id))))
        .execute(conn).await?;
    Ok(())
}

async fn add_weapon_modifier(conn: &mut sqlx::PgConnection, item_id: &ItemEntityId, modifier: weapon::WeaponModifier) -> Result<(), GatewayError>
{
    sqlx::query("insert into weapon_modifier (weapon, modifier) values ($1, $2);")
        .bind(item_id.0)
        .bind(sqlx::types::Json(modifier))
        .execute(conn).await?;
    Ok(())
}

async fn get_character_inventory(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId) -> Result<InventoryEntity, GatewayError>
{
    let mut t = conn.begin().await?;
    let inventory = sqlx::query_as::<_, PgInventoryEntity>("select * from inventory where pchar = $1")
        .bind(char_id.0)
        .fetch_one(&mut t).await?;

    // TODO: inefficient
    let mut real_inventory = Vec::new();
    for inv_item in inventory.items.0.into_iter() {
        match inv_item {
            PgInventoryItemEntity::Individual(item) => {
                let entity = sqlx::query_as::<_, PgItemEntity>("select item.id, item.item from item where id = $1")
                    .bind(item)
                    .fetch_one(&mut t).await
                    .map(|item| item.into())
                    .map(|item| apply_item_modifications(&mut t, item))?
                    .await;
                real_inventory.push(InventoryItemEntity::Individual(entity));
            },
            PgInventoryItemEntity::Stacked(items) => {
                let mut stacked_item = Vec::new();
                for s_item in items {
                    stacked_item.push(sqlx::query_as::<_, PgItemEntity>("select item.id, item.item from item where id = $1")
                                      .bind(s_item)
                                      .fetch_one(&mut t).await
                                      .map(|item| item.into())?)
                }
                real_inventory.push(InventoryItemEntity::Stacked(stacked_item));
            }
        }
    }

    Ok(InventoryEntity::new(real_inventory))
}

async fn get_character_bank(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, bank_name: &BankName) -> Result<BankEntity, GatewayError>
{
    let mut t = conn.begin().await?;
    let bank = sqlx::query_as::<_, PgInventoryEntity>("select * from bank where pchar = $1 and name = $2")
        .bind(char_id.0)
        .bind(bank_name.0.clone())
        .fetch_one(&mut t).await?;
    // TODO: inefficient
    let mut real_bank = Vec::new();
    for bank_item in bank.items.0.into_iter() {
        match bank_item {
            PgInventoryItemEntity::Individual(item) => {
                let entity = sqlx::query_as::<_, PgItemEntity>("select item.id, item.item from item where id = $1")
                    .bind(item)
                    .fetch_one(&mut t).await
                    .map(|item| item.into())
                    .map(|item| apply_item_modifications(&mut t, item))?
                    .await;
                real_bank.push(BankItemEntity::Individual(entity));
            },
            PgInventoryItemEntity::Stacked(items) => {
                let mut stacked_item = Vec::new();
                for s_item in items {
                    stacked_item.push(sqlx::query_as::<_, PgItemEntity>("select item.id, item.item from item where id = $1")
                                      .bind(s_item)
                                      .fetch_one(&mut t).await
                                      .map(|item| item.into())
                                      .map(|item| apply_item_modifications(&mut t, item))?
                                      .await)
                }
                real_bank.push(BankItemEntity::Stacked(stacked_item));
            }
        }
    }

    Ok(BankEntity::new(real_bank))
}

async fn set_character_inventory(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, inventory: &InventoryEntity) -> Result<(), GatewayError>
{
    let inventory = inventory.items.iter()
        .map(|item| {
            match item {
                InventoryItemEntity::Individual(item) => {
                    PgInventoryItemEntity::Individual(item.id.0 as i32)
                },
                InventoryItemEntity::Stacked(items) => {
                    PgInventoryItemEntity::Stacked(items.iter().map(|i| i.id.0 as i32).collect())
                },
            }
        })
        .collect::<Vec<_>>();

    sqlx::query("insert into inventory (pchar, items) values ($1, $2) on conflict (pchar) do update set items = $2")
        .bind(char_id.0)
        .bind(sqlx::types::Json(inventory))
        .execute(conn)
        .await?;
    Ok(())
}

async fn set_character_bank(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, bank: &BankEntity, bank_name: &BankName) -> Result<(), GatewayError>
{
    let bank = bank.items.iter()
        .map(|item| {
            match item {
                BankItemEntity::Individual(item) => {
                    PgInventoryItemEntity::Individual(item.id.0 as i32)
                },
                BankItemEntity::Stacked(items) => {
                    PgInventoryItemEntity::Stacked(items.iter().map(|i| i.id.0 as i32).collect())
                },
            }
        })
        .collect::<Vec<_>>();

    sqlx::query("insert into bank (pchar, items, name) values ($1, $2, $3) on conflict (pchar, name) do update set items = $2")
        .bind(char_id.0)
        .bind(sqlx::types::Json(bank))
        .bind(bank_name.0.clone())
        .execute(conn)
        .await?;
    Ok(())
}

async fn get_character_equips(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId) -> Result<EquippedEntity, GatewayError>
{
    let equips = sqlx::query_as::<_, PgEquipped>("select * from equipped where pchar = $1")
        .bind(char_id.0)
        .fetch_one(conn)
        .await?;

    Ok(equips.into())
}

async fn set_character_equips(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, equips: &EquippedEntity) -> Result<(), GatewayError>
{
    sqlx::query(r#"insert into equipped (pchar, weapon, armor, shield, unit0, unit1, unit2, unit3, mag) values ($1, $2, $3, $4, $5, $6, $7, $8, $9)
                       on conflict (pchar) do update set weapon=$2, armor=$3, shield=$4, unit0=$5, unit1=$6, unit2=$7, unit3=$8, mag=$9"#)
        .bind(char_id.0)
        .bind(equips.weapon.map(|i| i.0 as i32))
        .bind(equips.armor.map(|i| i.0 as i32))
        .bind(equips.shield.map(|i| i.0 as i32))
        .bind(equips.unit[0].map(|i| i.0 as i32))
        .bind(equips.unit[1].map(|i| i.0 as i32))
        .bind(equips.unit[2].map(|i| i.0 as i32))
        .bind(equips.unit[3].map(|i| i.0 as i32))
        .bind(equips.mag.map(|i| i.0 as i32))
        .execute(conn)
        .await?;
    Ok(())
}

async fn set_character_meseta(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, meseta: Meseta) -> Result<(), GatewayError>
{
    sqlx::query("insert into character_meseta values ($1, $2) on conflict (pchar) do update set items = $2")
        .bind(char_id.0)
        .bind(meseta.0 as i32)
        .execute(conn)
        .await?;
    Ok(())
}

async fn get_character_meseta(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId) -> Result<Meseta, GatewayError>
{
    #[derive(sqlx::FromRow)]
    struct PgMeseta(i32);
    let meseta = sqlx::query_as::<_, PgMeseta>(r#"select meseta from character_meseta where id = $1"#)
        .bind(char_id.0)
        .fetch_one(conn)
        .await?;
    Ok(Meseta(meseta.0 as u32))
}

async fn set_bank_meseta(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, bank: &BankName, meseta: Meseta) -> Result<(), GatewayError>
{
    sqlx::query("insert into bank_meseta values ($1, $2, $3) on conflict (pchar, bank) do update set items = $2")
        .bind(char_id.0)
        .bind(meseta.0 as i32)
        .bind(bank.0.clone())
        .execute(conn)
        .await?;
    Ok(())
}

async fn get_bank_meseta(conn: &mut sqlx::PgConnection, char_id: &CharacterEntityId, bank: &BankName) -> Result<Meseta, GatewayError>
{
    #[derive(sqlx::FromRow)]
    struct PgMeseta(i32);
    let meseta = sqlx::query_as::<_, PgMeseta>(r#"select meseta from character_meseta where id = $1 and bank = $2"#)
        .bind(char_id.0)
        .bind(bank.0.clone())
        .fetch_one(conn)
        .await?;
    Ok(Meseta(meseta.0 as u32))
}

async fn create_trade(conn: &mut sqlx::PgConnection, char_id1: &CharacterEntityId, char_id2: &CharacterEntityId) -> Result<TradeEntity, GatewayError>
{
    let trade = sqlx::query_as::<_, PgTradeEntity>(r#"insert into trades (character1, character2) values ($1, $2) returning *;"#)
        .bind(char_id1.0)
        .bind(char_id2.0)
        .fetch_one(conn)
        .await?;
    Ok(trade.into())
}

#[async_trait::async_trait]
impl EntityGateway for PostgresGateway {
    async fn transaction<'a>(&'a mut self) -> Result<Box<dyn EntityGatewayTransaction + 'a>, GatewayError>
    {
        Ok(Box::new(PostgresTransaction {
            pgtransaction: self.pool.begin().await?,
        }))
    }

    async fn with_transaction<'a, F, Fut, R, E>(&'a mut self, func: F) -> Result<R, E>
    where
        Fut: Future<Output = Result<(Box<dyn EntityGatewayTransaction + 'a>, R), E>> + Send + 'a,
        F: FnOnce(Box<dyn EntityGatewayTransaction + 'a>) -> Fut + Send,
        R: Send,
        E: From<GatewayError>,
    {
        let transaction = Box::new(PostgresTransaction {
            pgtransaction: self.pool.begin().await.map_err(|_| ()).unwrap()
        });
        let (transaction, result) = func(transaction).await.map_err(|_| ()).unwrap();
        transaction.commit().await.map_err(|_| ()).unwrap();
        Ok(result)
    }

    async fn create_user(&mut self, user: NewUserAccountEntity) -> Result<UserAccountEntity, GatewayError> {
        create_user(&mut *self.pool.acquire().await?, user).await
    }

    async fn get_user_by_id(&mut self, id: UserAccountId) -> Result<UserAccountEntity, GatewayError> {
        get_user_by_id(&mut *self.pool.acquire().await?, id).await
    }

    async fn get_user_by_name(&mut self, username: String) -> Result<UserAccountEntity, GatewayError> {
        get_user_by_name(&mut *self.pool.acquire().await?, username).await
    }

    async fn save_user(&mut self, user: &UserAccountEntity) -> Result<(), GatewayError> {
        save_user(&mut *self.pool.acquire().await?, user).await
    }

    async fn create_user_settings(&mut self, settings: NewUserSettingsEntity) -> Result<UserSettingsEntity, GatewayError> {
        create_user_settings(&mut *self.pool.acquire().await?, settings).await
    }

    async fn get_user_settings_by_user(&mut self, user: &UserAccountEntity) -> Result<UserSettingsEntity, GatewayError> {
        get_user_settings_by_user(&mut *self.pool.acquire().await?, user).await
    }

    async fn save_user_settings(&mut self, settings: &UserSettingsEntity) -> Result<(), GatewayError> {
        save_user_settings(&mut *self.pool.acquire().await?, settings).await
    }

    async fn create_character(&mut self, char: NewCharacterEntity) -> Result<CharacterEntity, GatewayError> {
        create_character(&mut *self.pool.acquire().await?, char).await
    }

    async fn get_characters_by_user(&mut self, user: &UserAccountEntity) -> Result<[Option<CharacterEntity>; 4], GatewayError> {
        get_characters_by_user(&mut *self.pool.acquire().await?, user).await
    }

    async fn save_character(&mut self, char: &CharacterEntity) -> Result<(), GatewayError> {
        save_character(&mut *self.pool.acquire().await?, char).await
    }

    async fn get_guild_card_data_by_user(&mut self, user: &UserAccountEntity) -> Result<GuildCardDataEntity, GatewayError> {
        Ok(GuildCardDataEntity {
            id: GuildCardDataId(0),
            user_id: user.id,
            guildcard: guildcard::GuildCardData::default(),
        })
    }

    async fn create_item(&mut self, item: NewItemEntity) -> Result<ItemEntity, GatewayError> {
        create_item(&mut *self.pool.acquire().await?, item).await
    }

    async fn add_item_note(&mut self, item_id: &ItemEntityId, item_note: ItemNote) -> Result<(), GatewayError> {
        add_item_note(&mut *self.pool.acquire().await?, item_id, item_note).await
    }

    async fn feed_mag(&mut self, mag_item_id: &ItemEntityId, tool_item_id: &ItemEntityId) -> Result<(), GatewayError> {
        feed_mag(&mut *self.pool.acquire().await?, mag_item_id, tool_item_id).await
    }

    async fn change_mag_owner(&mut self, mag_item_id: &ItemEntityId, character: &CharacterEntity) -> Result<(), GatewayError> {
        change_mag_owner(&mut *self.pool.acquire().await?, mag_item_id, character).await
    }

    async fn use_mag_cell(&mut self, mag_item_id: &ItemEntityId, mag_cell_id: &ItemEntityId) -> Result<(), GatewayError> {
        use_mag_cell(&mut *self.pool.acquire().await?, mag_item_id, mag_cell_id).await
    }

    async fn add_weapon_modifier(&mut self, item_id: &ItemEntityId, modifier: weapon::WeaponModifier) -> Result<(), GatewayError> {
        add_weapon_modifier(&mut *self.pool.acquire().await?, item_id, modifier).await
    }

    async fn get_character_inventory(&mut self, char_id: &CharacterEntityId) -> Result<InventoryEntity, GatewayError> {
        get_character_inventory(&mut *self.pool.acquire().await?, char_id).await
    }

    async fn get_character_bank(&mut self, char_id: &CharacterEntityId, bank_name: &BankName) -> Result<BankEntity, GatewayError> {
        get_character_bank(&mut *self.pool.acquire().await?, char_id, bank_name).await
    }

    async fn set_character_inventory(&mut self, char_id: &CharacterEntityId, inventory: &InventoryEntity) -> Result<(), GatewayError> {
        set_character_inventory(&mut *self.pool.acquire().await?, char_id, inventory).await
    }

    async fn set_character_bank(&mut self, char_id: &CharacterEntityId, bank: &BankEntity, bank_name: &BankName) -> Result<(), GatewayError> {
        set_character_bank(&mut *self.pool.acquire().await?, char_id, bank, bank_name).await
    }

    async fn get_character_equips(&mut self, char_id: &CharacterEntityId) -> Result<EquippedEntity, GatewayError> {
        get_character_equips(&mut *self.pool.acquire().await?, char_id).await
    }

    async fn set_character_equips(&mut self, char_id: &CharacterEntityId, equips: &EquippedEntity) -> Result<(), GatewayError> {
        set_character_equips(&mut *self.pool.acquire().await?, char_id, equips).await
    }

    async fn set_character_meseta(&mut self, char_id: &CharacterEntityId, meseta: Meseta) -> Result<(), GatewayError> {
        set_character_meseta(&mut *self.pool.acquire().await?, char_id, meseta).await
    }

    async fn get_character_meseta(&mut self, char_id: &CharacterEntityId) -> Result<Meseta, GatewayError> {
        get_character_meseta(&mut *self.pool.acquire().await?, char_id).await
    }

    async fn set_bank_meseta(&mut self, char_id: &CharacterEntityId, bank: &BankName, meseta: Meseta) -> Result<(), GatewayError> {
        set_bank_meseta(&mut *self.pool.acquire().await?, char_id, bank, meseta).await
    }

    async fn get_bank_meseta(&mut self, char_id: &CharacterEntityId, bank: &BankName) -> Result<Meseta, GatewayError> {
        get_bank_meseta(&mut *self.pool.acquire().await?, char_id, bank).await
    }

    async fn create_trade(&mut self, char_id1: &CharacterEntityId, char_id2: &CharacterEntityId) -> Result<TradeEntity, GatewayError> {
        create_trade(&mut *self.pool.acquire().await?, char_id1, char_id2).await
    }
}


#[async_trait::async_trait]
impl<'c> EntityGateway for PostgresTransaction<'c> {
    async fn create_user(&mut self, user: NewUserAccountEntity) -> Result<UserAccountEntity, GatewayError> {
        create_user(&mut *self.pgtransaction, user).await
    }

    async fn get_user_by_id(&mut self, id: UserAccountId) -> Result<UserAccountEntity, GatewayError> {
        get_user_by_id(&mut *self.pgtransaction, id).await
    }

    async fn get_user_by_name(&mut self, username: String) -> Result<UserAccountEntity, GatewayError> {
        get_user_by_name(&mut *self.pgtransaction, username).await
    }

    async fn save_user(&mut self, user: &UserAccountEntity) -> Result<(), GatewayError> {
        save_user(&mut *self.pgtransaction, user).await
    }

    async fn create_user_settings(&mut self, settings: NewUserSettingsEntity) -> Result<UserSettingsEntity, GatewayError> {
        create_user_settings(&mut *self.pgtransaction, settings).await
    }

    async fn get_user_settings_by_user(&mut self, user: &UserAccountEntity) -> Result<UserSettingsEntity, GatewayError> {
        get_user_settings_by_user(&mut *self.pgtransaction, user).await
    }

    async fn save_user_settings(&mut self, settings: &UserSettingsEntity) -> Result<(), GatewayError> {
        save_user_settings(&mut *self.pgtransaction, settings).await
    }

    async fn create_character(&mut self, char: NewCharacterEntity) -> Result<CharacterEntity, GatewayError> {
        create_character(&mut *self.pgtransaction, char).await
    }

    async fn get_characters_by_user(&mut self, user: &UserAccountEntity) -> Result<[Option<CharacterEntity>; 4], GatewayError> {
        get_characters_by_user(&mut *self.pgtransaction, user).await
    }

    async fn save_character(&mut self, char: &CharacterEntity) -> Result<(), GatewayError> {
        save_character(&mut *self.pgtransaction, char).await
    }

    async fn get_guild_card_data_by_user(&mut self, user: &UserAccountEntity) -> Result<GuildCardDataEntity, GatewayError> {
        Ok(GuildCardDataEntity {
            id: GuildCardDataId(0),
            user_id: user.id,
            guildcard: guildcard::GuildCardData::default(),
        })
    }

    async fn create_item(&mut self, item: NewItemEntity) -> Result<ItemEntity, GatewayError> {
        create_item(&mut *self.pgtransaction, item).await
    }

    async fn add_item_note(&mut self, item_id: &ItemEntityId, item_note: ItemNote) -> Result<(), GatewayError> {
        add_item_note(&mut *self.pgtransaction, item_id, item_note).await
    }

    async fn feed_mag(&mut self, mag_item_id: &ItemEntityId, tool_item_id: &ItemEntityId) -> Result<(), GatewayError> {
        feed_mag(&mut *self.pgtransaction, mag_item_id, tool_item_id).await
    }

    async fn change_mag_owner(&mut self, mag_item_id: &ItemEntityId, character: &CharacterEntity) -> Result<(), GatewayError> {
        change_mag_owner(&mut *self.pgtransaction, mag_item_id, character).await
    }

    async fn use_mag_cell(&mut self, mag_item_id: &ItemEntityId, mag_cell_id: &ItemEntityId) -> Result<(), GatewayError> {
        use_mag_cell(&mut *self.pgtransaction, mag_item_id, mag_cell_id).await
    }

    async fn add_weapon_modifier(&mut self, item_id: &ItemEntityId, modifier: weapon::WeaponModifier) -> Result<(), GatewayError> {
        add_weapon_modifier(&mut *self.pgtransaction, item_id, modifier).await
    }

    async fn get_character_inventory(&mut self, char_id: &CharacterEntityId) -> Result<InventoryEntity, GatewayError> {
        get_character_inventory(&mut *self.pgtransaction, char_id).await
    }

    async fn get_character_bank(&mut self, char_id: &CharacterEntityId, bank_name: &BankName) -> Result<BankEntity, GatewayError> {
        get_character_bank(&mut *self.pgtransaction, char_id, bank_name).await
    }

    async fn set_character_inventory(&mut self, char_id: &CharacterEntityId, inventory: &InventoryEntity) -> Result<(), GatewayError> {
        set_character_inventory(&mut *self.pgtransaction, char_id, inventory).await
    }

    async fn set_character_bank(&mut self, char_id: &CharacterEntityId, bank: &BankEntity, bank_name: &BankName) -> Result<(), GatewayError> {
        set_character_bank(&mut *self.pgtransaction, char_id, bank, bank_name).await
    }

    async fn get_character_equips(&mut self, char_id: &CharacterEntityId) -> Result<EquippedEntity, GatewayError> {
        get_character_equips(&mut *self.pgtransaction, char_id).await
    }

    async fn set_character_equips(&mut self, char_id: &CharacterEntityId, equips: &EquippedEntity) -> Result<(), GatewayError> {
        set_character_equips(&mut *self.pgtransaction, char_id, equips).await
    }

    async fn set_character_meseta(&mut self, char_id: &CharacterEntityId, meseta: Meseta) -> Result<(), GatewayError> {
        set_character_meseta(&mut *self.pgtransaction, char_id, meseta).await
    }

    async fn get_character_meseta(&mut self, char_id: &CharacterEntityId) -> Result<Meseta, GatewayError> {
        get_character_meseta(&mut *self.pgtransaction, char_id).await
    }

    async fn set_bank_meseta(&mut self, char_id: &CharacterEntityId, bank: &BankName, meseta: Meseta) -> Result<(), GatewayError> {
        set_bank_meseta(&mut *self.pgtransaction, char_id, bank, meseta).await
    }

    async fn get_bank_meseta(&mut self, char_id: &CharacterEntityId, bank: &BankName) -> Result<Meseta, GatewayError> {
        get_bank_meseta(&mut *self.pgtransaction, char_id, bank).await
    }

    async fn create_trade(&mut self, char_id1: &CharacterEntityId, char_id2: &CharacterEntityId) -> Result<TradeEntity, GatewayError> {
        create_trade(&mut *self.pgtransaction, char_id1, char_id2).await
    }
}