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use super::error::SwitchboardError;
use anchor_lang::prelude::*;
use core::cmp::Ordering;
use core::result::Result;
use rust_decimal::prelude::{FromPrimitive, ToPrimitive};
use rust_decimal::Decimal;
use solana_program::program_error::ProgramError;
use std::convert::{From, TryInto};

#[zero_copy]
#[derive(Default, Debug, Eq, PartialEq, AnchorDeserialize)]
pub struct SwitchboardDecimal {
    pub mantissa: i128,
    pub scale: u32,
}

impl SwitchboardDecimal {
    pub fn new(mantissa: i128, scale: u32) -> SwitchboardDecimal {
        Self { mantissa, scale }
    }
    pub fn from_rust_decimal(d: Decimal) -> SwitchboardDecimal {
        Self::new(d.mantissa(), d.scale())
    }
    pub fn from_f64(v: f64) -> SwitchboardDecimal {
        let dec = Decimal::from_f64(v).unwrap();
        Self::from_rust_decimal(dec)
    }
}

impl TryInto<Decimal> for &SwitchboardDecimal {
    type Error = ProgramError;
    fn try_into(self) -> Result<Decimal, ProgramError> {
        Decimal::try_from_i128_with_scale(self.mantissa, self.scale)
            .map_err(|_| ProgramError::from(SwitchboardError::DecimalConversionError))
    }
}

impl Ord for SwitchboardDecimal {
    fn cmp(&self, other: &Self) -> Ordering {
        let s: Decimal = self.try_into().unwrap();
        let other: Decimal = other.try_into().unwrap();
        s.cmp(&other)
    }
}

impl PartialOrd for SwitchboardDecimal {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        let s: Decimal = self.try_into().unwrap();
        let other: Decimal = other.try_into().unwrap();
        s.partial_cmp(&other)
    }
    fn lt(&self, other: &Self) -> bool {
        let s: Decimal = self.try_into().unwrap();
        let other: Decimal = other.try_into().unwrap();
        s < other
    }
    fn le(&self, other: &Self) -> bool {
        let s: Decimal = self.try_into().unwrap();
        let other: Decimal = other.try_into().unwrap();
        s <= other
    }
    fn gt(&self, other: &Self) -> bool {
        let s: Decimal = self.try_into().unwrap();
        let other: Decimal = other.try_into().unwrap();
        s > other
    }
    fn ge(&self, other: &Self) -> bool {
        let s: Decimal = self.try_into().unwrap();
        let other: Decimal = other.try_into().unwrap();
        s >= other
    }
}

impl From<&SwitchboardDecimal> for bool {
    fn from(s: &SwitchboardDecimal) -> Self {
        let dec: Decimal = s.try_into().unwrap();
        dec.round().mantissa() != 0
    }
}

impl TryInto<u64> for &SwitchboardDecimal {
    type Error = ProgramError;
    fn try_into(self) -> Result<u64, ProgramError> {
        let dec: Decimal = self.try_into().unwrap();
        dec.to_u64()
            .ok_or(ProgramError::from(SwitchboardError::IntegerOverflowError))
    }
}

impl TryInto<i64> for &SwitchboardDecimal {
    type Error = ProgramError;
    fn try_into(self) -> Result<i64, ProgramError> {
        let dec: Decimal = self.try_into().unwrap();
        dec.to_i64()
            .ok_or(ProgramError::from(SwitchboardError::IntegerOverflowError))
    }
}

impl TryInto<f64> for &SwitchboardDecimal {
    type Error = ProgramError;
    fn try_into(self) -> Result<f64, ProgramError> {
        let dec: Decimal = self.try_into().unwrap();
        dec.to_f64()
            .ok_or(ProgramError::from(SwitchboardError::IntegerOverflowError))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn switchboard_decimal_into_rust_decimal() {
        let swb_decimal = &SwitchboardDecimal {
            mantissa: 12345,
            scale: 2,
        };
        let decimal: Decimal = swb_decimal.try_into().unwrap();
        assert_eq!(decimal.mantissa(), 12345);
        assert_eq!(decimal.scale(), 2);
    }

    #[test]
    fn empty_switchboard_decimal_is_false() {
        let swb_decimal = &SwitchboardDecimal {
            mantissa: 0,
            scale: 0,
        };
        let b: bool = swb_decimal.into();
        assert_eq!(b, false);
    }

    #[test]
    fn switchboard_decimal_to_u64() {
        // 1234.5678
        let swb_decimal = &SwitchboardDecimal {
            mantissa: 12345678,
            scale: 4,
        };
        let b: u64 = swb_decimal.try_into().unwrap();
        assert_eq!(b, 1234);
    }

    #[test]
    fn switchboard_decimal_to_f64() {
        // 1234.5678
        let swb_decimal = &SwitchboardDecimal {
            mantissa: 12345678,
            scale: 4,
        };
        let b: f64 = swb_decimal.try_into().unwrap();
        assert_eq!(b, 1234.5678);

        let swb_f64 = &SwitchboardDecimal::from_f64(1234.5678);
        assert_eq!(swb_decimal, swb_f64);
    }
}