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use codec::{Decode, Encode};
use scale_info::TypeInfo;

#[derive(Encode, Decode, Clone, Copy, Debug, Eq, PartialEq, TypeInfo)]
pub enum PoolType<AssetId> {
    XYK,
    LBP,
    Stableswap(AssetId),
    Omnipool,
}

#[derive(Debug, PartialEq, Eq)]
pub enum ExecutorError<E> {
    NotSupported,
    Error(E),
}

pub trait TradeExecution<Origin, AccountId, AssetId, Balance> {
    type Error;

    fn calculate_sell(
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_in: Balance,
    ) -> Result<Balance, ExecutorError<Self::Error>>;

    fn calculate_buy(
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_out: Balance,
    ) -> Result<Balance, ExecutorError<Self::Error>>;

    fn execute_sell(
        who: Origin,
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_in: Balance,
        min_limit: Balance,
    ) -> Result<(), ExecutorError<Self::Error>>;

    fn execute_buy(
        who: Origin,
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_out: Balance,
        max_limit: Balance,
    ) -> Result<(), ExecutorError<Self::Error>>;
}

#[allow(clippy::redundant_clone)] //Needed as it complains about redundant clone, but clone is needed as Origin is moved and it is not copy type.
#[impl_trait_for_tuples::impl_for_tuples(1, 5)]
impl<E: PartialEq, Origin: Clone, AccountId, AssetId: Copy, Balance: Copy>
    TradeExecution<Origin, AccountId, AssetId, Balance> for Tuple
{
    for_tuples!( where #(Tuple: TradeExecution<Origin,AccountId, AssetId, Balance, Error=E>)*);
    type Error = E;

    fn calculate_sell(
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_in: Balance,
    ) -> Result<Balance, ExecutorError<Self::Error>> {
        for_tuples!(
            #(
                let value = match Tuple::calculate_sell(pool_type, asset_in,asset_out,amount_in) {
                    Ok(result) => return Ok(result),
                    Err(v) if v == ExecutorError::NotSupported => v,
                    Err(v) => return Err(v),
                };
            )*
        );
        Err(value)
    }

    fn calculate_buy(
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_out: Balance,
    ) -> Result<Balance, ExecutorError<Self::Error>> {
        for_tuples!(
            #(
                let value = match Tuple::calculate_buy(pool_type, asset_in,asset_out,amount_out) {
                    Ok(result) => return Ok(result),
                    Err(v) if v == ExecutorError::NotSupported => v,
                    Err(v) => return Err(v),
                };
            )*
        );
        Err(value)
    }

    fn execute_sell(
        who: Origin,
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_in: Balance,
        min_limit: Balance,
    ) -> Result<(), ExecutorError<Self::Error>> {
        for_tuples!(
            #(
                let value = match Tuple::execute_sell(who.clone(),pool_type, asset_in, asset_out, amount_in, min_limit) {
                    Ok(result) => return Ok(result),
                    Err(v) if v == ExecutorError::NotSupported => v,
                    Err(v) => return Err(v),
                };
            )*
        );
        Err(value)
    }

    fn execute_buy(
        who: Origin,
        pool_type: PoolType<AssetId>,
        asset_in: AssetId,
        asset_out: AssetId,
        amount_out: Balance,
        max_limit: Balance,
    ) -> Result<(), ExecutorError<Self::Error>> {
        for_tuples!(
            #(
                let value = match Tuple::execute_buy(who.clone(), pool_type,asset_in, asset_out, amount_out, max_limit) {
                    Ok(result) => return Ok(result),
                    Err(v) if v == ExecutorError::NotSupported => v,
                    Err(v) => return Err(v),
                };
            )*
        );
        Err(value)
    }
}