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use async_trait::async_trait;
use fuel_core_interfaces::{
    common::fuel_tx::Receipt,
    db::DatabaseTransaction,
    executor::{
        Error as ExecutorError,
        ExecutionBlock,
        UncommittedResult,
    },
    model::{
        ArcPoolTx,
        BlockHeight,
        DaBlockHeight,
        FuelBlockDb,
    },
};
use std::borrow::Cow;

pub trait BlockProducerDatabase: Send + Sync {
    /// Fetch previously committed block at given height.
    fn get_block(
        &self,
        fuel_height: BlockHeight,
    ) -> anyhow::Result<Option<Cow<FuelBlockDb>>>;

    /// Fetch the current block height.
    fn current_block_height(&self) -> anyhow::Result<BlockHeight>;
}

#[async_trait]
pub trait TxPool: Sync + Send {
    async fn get_includable_txs(
        &self,
        // could be used by the txpool to filter txs based on maturity
        block_height: BlockHeight,
        // The upper limit for the total amount of gas of these txs
        max_gas: u64,
    ) -> anyhow::Result<Vec<ArcPoolTx>>;
}

#[async_trait::async_trait]
pub trait Relayer: Sync + Send {
    /// Get the best finalized height from the DA layer
    async fn get_best_finalized_da_height(&self) -> anyhow::Result<DaBlockHeight>;
}

// TODO: Replace by the analog from the `fuel-core-storage`.
pub type DBTransaction<Database> = Box<dyn DatabaseTransaction<Database>>;

pub trait Executor<Database: ?Sized>: Sync + Send {
    /// Executes the block and returns the result of execution with uncommitted database
    /// transaction.
    fn execute_without_commit(
        &self,
        block: ExecutionBlock,
    ) -> Result<UncommittedResult<DBTransaction<Database>>, ExecutorError>;

    /// Executes the block without committing it to the database. During execution collects the
    /// receipts to return them. The `utxo_validation` field can be used to disable the validation
    /// of utxos during execution.
    fn dry_run(
        &self,
        block: ExecutionBlock,
        utxo_validation: Option<bool>,
    ) -> Result<Vec<Vec<Receipt>>, ExecutorError>;
}