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use crate::{
    database::{
        storage::{
            DatabaseColumn,
            ToDatabaseKey,
        },
        Column,
        Database,
        Error as DatabaseError,
        Result as DatabaseResult,
    },
    state::IterDirection,
};
use fuel_core_chain_config::CoinConfig;
use fuel_core_storage::{
    tables::Coins,
    Error as StorageError,
    Mappable,
    StorageAsMut,
    StorageInspect,
    StorageMutate,
};
use fuel_core_txpool::types::TxId;
use fuel_core_types::{
    entities::coin::{
        CoinStatus,
        CompressedCoin,
    },
    fuel_tx::{
        Address,
        Bytes32,
        UtxoId,
    },
};
use std::borrow::Cow;

// TODO: Reuse `fuel_vm::storage::double_key` macro.
pub fn owner_coin_id_key(
    owner: &Address,
    coin_id: &UtxoId,
) -> [u8; Address::LEN + TxId::LEN + 1] {
    let mut default = [0u8; Address::LEN + TxId::LEN + 1];
    default[0..Address::LEN].copy_from_slice(owner.as_ref());
    default[Address::LEN..].copy_from_slice(utxo_id_to_bytes(coin_id).as_ref());
    default
}

fn utxo_id_to_bytes(utxo_id: &UtxoId) -> [u8; TxId::LEN + 1] {
    let mut default = [0; TxId::LEN + 1];
    default[0..TxId::LEN].copy_from_slice(utxo_id.tx_id().as_ref());
    default[TxId::LEN] = utxo_id.output_index();
    default
}

/// The storage table of owned coin ids. Maps addresses to owned coins.
pub struct OwnedCoins;
/// The storage key for owned coins: `Address ++ UtxoId`
pub type OwnedCoinKey = [u8; Address::LEN + TxId::LEN + 1];

impl Mappable for OwnedCoins {
    type Key = Self::OwnedKey;
    type OwnedKey = OwnedCoinKey;
    type Value = Self::OwnedValue;
    type OwnedValue = bool;
}

impl DatabaseColumn for OwnedCoins {
    fn column() -> Column {
        Column::OwnedCoins
    }
}

impl ToDatabaseKey for OwnedCoinKey {
    type Type<'a> = &'a [u8];

    fn database_key(&self) -> Self::Type<'_> {
        &self[..]
    }
}

impl StorageInspect<Coins> for Database {
    type Error = StorageError;

    fn get(&self, key: &UtxoId) -> Result<Option<Cow<CompressedCoin>>, Self::Error> {
        Database::get(self, &utxo_id_to_bytes(key), Column::Coins).map_err(Into::into)
    }

    fn contains_key(&self, key: &UtxoId) -> Result<bool, Self::Error> {
        Database::contains_key(self, &utxo_id_to_bytes(key), Column::Coins)
            .map_err(Into::into)
    }
}

impl StorageMutate<Coins> for Database {
    fn insert(
        &mut self,
        key: &UtxoId,
        value: &CompressedCoin,
    ) -> Result<Option<CompressedCoin>, Self::Error> {
        let coin_by_owner = owner_coin_id_key(&value.owner, key);
        // insert primary record
        let insert = Database::insert(self, utxo_id_to_bytes(key), Column::Coins, value)?;
        // insert secondary index by owner
        self.storage_as_mut::<OwnedCoins>()
            .insert(&coin_by_owner, &true)?;
        Ok(insert)
    }

    fn remove(&mut self, key: &UtxoId) -> Result<Option<CompressedCoin>, Self::Error> {
        let coin: Option<CompressedCoin> =
            Database::remove(self, &utxo_id_to_bytes(key), Column::Coins)?;

        // cleanup secondary index
        if let Some(coin) = &coin {
            let key = owner_coin_id_key(&coin.owner, key);
            self.storage_as_mut::<OwnedCoins>().remove(&key)?;
        }

        Ok(coin)
    }
}

impl Database {
    pub fn owned_coins_ids(
        &self,
        owner: &Address,
        start_coin: Option<UtxoId>,
        direction: Option<IterDirection>,
    ) -> impl Iterator<Item = DatabaseResult<UtxoId>> + '_ {
        self.iter_all_filtered::<Vec<u8>, bool, _, _>(
            Column::OwnedCoins,
            Some(*owner),
            start_coin.map(|b| owner_coin_id_key(owner, &b)),
            direction,
        )
        // Safety: key is always 64 bytes
        .map(|res| {
            res.map(|(key, _)| {
                UtxoId::new(
                    unsafe { Bytes32::from_slice_unchecked(&key[32..64]) },
                    key[64],
                )
            })
        })
    }

    pub fn get_coin_config(&self) -> DatabaseResult<Option<Vec<CoinConfig>>> {
        let configs = self
            .iter_all::<Vec<u8>, CompressedCoin>(Column::Coins, None)
            .filter_map(|coin| {
                // Return only unspent coins
                if let Ok(coin) = coin {
                    if coin.1.status == CoinStatus::Unspent {
                        Some(Ok(coin))
                    } else {
                        None
                    }
                } else {
                    Some(coin)
                }
            })
            .map(|raw_coin| -> DatabaseResult<CoinConfig> {
                let coin = raw_coin?;

                let byte_id =
                    Bytes32::new(coin.0[..32].try_into().map_err(DatabaseError::from)?);
                let output_index = coin.0[32];

                Ok(CoinConfig {
                    tx_id: Some(byte_id),
                    output_index: Some(output_index.into()),
                    block_created: Some(coin.1.block_created),
                    maturity: Some(coin.1.maturity),
                    owner: coin.1.owner,
                    amount: coin.1.amount,
                    asset_id: coin.1.asset_id,
                })
            })
            .collect::<DatabaseResult<Vec<CoinConfig>>>()?;

        Ok(Some(configs))
    }
}