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use crate::pb::eth::v2 as pb;
use substreams::scalar::{BigDecimal, BigInt};

impl Into<BigInt> for pb::BigInt {
    fn into(self) -> BigInt {
        BigInt::from_unsigned_bytes_be(self.bytes.as_ref())
    }
}

impl Into<BigDecimal> for pb::BigInt {
    fn into(self) -> BigDecimal {
        let v = BigInt::from_unsigned_bytes_be(self.bytes.as_ref());
        BigDecimal::new(v, 0)
    }
}

pub fn to_option_decimal(v: Option<pb::BigInt>) -> Option<BigDecimal> {
    match v {
        Some(v) => {
            let out: BigDecimal = v.into();
            Some(out)
        }
        None => None,
    }
}

pub fn to_option_bigint(v: Option<pb::BigInt>) -> Option<BigInt> {
    match v {
        Some(v) => Some(v.into()),
        None => None,
    }
}

pub fn to_option_decimal_with_decimal(v: Option<pb::BigInt>, decimal: u32) -> Option<BigDecimal> {
    match v {
        Some(v) => Some(v.with_decimal(decimal)),
        None => None,
    }
}

impl pb::BigInt {
    pub fn with_decimal(self, decimal: u32) -> BigDecimal {
        let num: BigDecimal = self.into();
        let dem = BigInt::from(10 as u32).pow(decimal);
        return num / BigDecimal::from(dem);
    }
}

#[cfg(test)]
mod tests {
    use crate::pb::eth::v2 as pb;
    use crate::scalar::{to_option_bigint, to_option_decimal, to_option_decimal_with_decimal};

    #[test]
    fn zero_into_bigint() {
        let v: substreams::scalar::BigInt = new_pb_bigint(0).into();
        assert_eq!(v.to_u64(), 0);
    }

    #[test]
    fn number_into_bigint() {
        let v: substreams::scalar::BigInt = new_pb_bigint(253).into();
        assert_eq!(v.to_u64(), 253);
    }

    #[test]
    fn zero_into_bigdecmal() {
        let v: substreams::scalar::BigDecimal = new_pb_bigint(0).into();
        assert_eq!(v.to_string(), "0");
    }

    #[test]
    fn number_into_bigdecmal() {
        let v: substreams::scalar::BigDecimal = new_pb_bigint(253).into();
        assert_eq!(v.to_string(), "253");
    }

    #[test]
    fn some_option_pb_to_decimal() {
        let v = Some(new_pb_bigint(253));
        assert_eq!(
            to_option_decimal(v),
            Some(substreams::scalar::BigDecimal::from(253 as u32))
        );
    }

    #[test]
    fn none_option_pb_to_decimal() {
        let v: Option<pb::BigInt> = None;
        assert_eq!(to_option_decimal(v), None);
    }

    #[test]
    fn some_option_pb_to_bigint() {
        let v = Some(new_pb_bigint(253));
        assert_eq!(
            to_option_bigint(v),
            Some(substreams::scalar::BigInt::from(253 as u32))
        );
    }

    #[test]
    fn none_option_pb_to_bigint() {
        let v: Option<pb::BigInt> = None;
        assert_eq!(to_option_bigint(v), None);
    }

    #[test]
    fn with_decimal() {
        let v = new_pb_bigint_bytes(vec![114, 10, 199, 169, 74, 64, 0].as_ref());
        assert_eq!(v.with_decimal(18).to_string(), "0.0321");
    }

    #[test]
    fn some_option_pb_to_bigdecimal_with_decimal() {
        let v = Some(new_pb_bigint_bytes(
            vec![114, 10, 199, 169, 74, 64, 0].as_ref(),
        ));
        let out = substreams::scalar::BigDecimal::try_from("0.0321".to_owned()).unwrap();
        assert_eq!(to_option_decimal_with_decimal(v, 18), Some(out));
    }

    #[test]
    fn none_option_pb_to_bigdecimal_with_decimal() {
        let v: Option<pb::BigInt> = None;
        assert_eq!(to_option_decimal_with_decimal(v, 18), None);
    }

    #[test]
    fn some_option_pb_to_bigdecimal() {
        let v = Some(new_pb_bigint(253));
        assert_eq!(
            to_option_decimal(v),
            Some(substreams::scalar::BigDecimal::from(253 as u32))
        );
    }

    #[test]
    fn none_option_pb_to_bigdecimal() {
        let v: Option<pb::BigInt> = None;
        assert_eq!(to_option_decimal(v), None);
    }

    pub fn new_pb_bigint(value: u32) -> pb::BigInt {
        let v = num_bigint::BigInt::new(num_bigint::Sign::Plus, vec![value]);
        let (_, bytes) = v.to_bytes_be();
        pb::BigInt { bytes }
    }

    pub fn new_pb_bigint_bytes(bytes: &[u8]) -> pb::BigInt {
        let v = num_bigint::BigInt::from_bytes_be(num_bigint::Sign::Plus, bytes);
        let (_, bytes) = v.to_bytes_be();
        pb::BigInt { bytes }
    }
}