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use crate::{Currency, CurrencyLocale};
use std::ops::{Add, AddAssign, Div, Mul, Sub, SubAssign};

impl<L, T> Add<T> for Currency<L>
where
    T: Into<Currency<L>>,
    L: CurrencyLocale + Default,
{
    type Output = Self;

    fn add(self, rhs: T) -> Self::Output {
        let rhs = rhs.into();
        if rhs.negative {
            self.sub(Self::new(false, rhs.full, rhs.part, rhs.locale))
        } else if self.negative {
            rhs.sub(Self::new(false, self.full, self.part, self.locale))
        } else {
            let new_part = self.part + rhs.part;
            let new_full = self.full + rhs.full + usize::from(new_part >= 100);
            Self::new(false, new_full, new_part % 100, self.locale)
        }
    }
}

impl<L, T> AddAssign<T> for Currency<L>
where
    T: Into<Currency<L>>,
    L: CurrencyLocale + Default + Clone,
{
    fn add_assign(&mut self, rhs: T) {
        let rhs = rhs.into();
        if rhs.negative {
            let new = self
                .clone()
                .sub(Self::new(false, rhs.full, rhs.part, rhs.locale));
            self.negative = new.negative;
            self.full = new.full;
            self.part = new.part;
        } else if self.negative {
            let new = rhs.sub(Self::new(false, self.full, self.part, L::default()));
            self.negative = new.negative;
            self.full = new.full;
            self.part = new.part;
        } else {
            let new_part = self.part + rhs.part;
            self.full += rhs.full + usize::from(new_part >= 100);
            self.part %= 100;
        }
    }
}

impl<L, T> Sub<T> for Currency<L>
where
    T: Into<Currency<L>>,
    L: CurrencyLocale + Default,
{
    type Output = Self;

    fn sub(self, rhs: T) -> Self::Output {
        let rhs = rhs.into();

        match (self.negative, rhs.negative) {
            (true | false, true) => self.add(Self::new(false, rhs.full, rhs.part, rhs.locale)),
            (true, false) => {
                let new_part = self.part + rhs.part;
                let new_full = self.full + rhs.full + usize::from(new_part >= 100);
                Self::new(false, new_full, new_part % 100, self.locale)
            }
            (false, false) => {
                let decrease_full = self.part.checked_sub(rhs.part).is_none();
                let decrement = rhs.full + usize::from(decrease_full);
                let mut negative = false;
                let (new_full, new_part) = if decrement > self.full {
                    negative = true;
                    (rhs.full - self.full, rhs.part - self.part)
                } else {
                    (self.full - decrement, self.part - rhs.part)
                };
                Self::new(negative, new_full, new_part, self.locale)
            }
        }
    }
}

impl<L, T> SubAssign<T> for Currency<L>
where
    T: Into<Currency<L>>,
    L: CurrencyLocale + Default + Clone,
{
    fn sub_assign(&mut self, rhs: T) {
        let rhs = rhs.into();

        match (self.negative, rhs.negative) {
            (true | false, true) => {
                let new = rhs
                    .clone()
                    .add(Self::new(false, rhs.full, rhs.part, L::default()));
                self.negative = new.negative;
                self.full = new.full;
                self.part = new.part;
            }
            (true, false) => {
                let new_part = self.part + rhs.part;
                let new_full = self.full + rhs.full + usize::from(new_part >= 100);
                self.part = new_part % 100;
                self.full = new_full;
            }
            (false, false) => {
                let decrease_full = self.part.checked_sub(rhs.part).is_none();
                let decrement = rhs.full + usize::from(decrease_full);
                let mut negative = false;
                let (new_full, new_part) = if decrement > self.full {
                    negative = true;
                    (
                        rhs.full - self.full - usize::from(decrease_full),
                        rhs.part - self.part,
                    )
                } else {
                    (self.full - decrement, self.part - rhs.part)
                };

                let new = Self::new(negative, new_full, new_part, self.locale.clone());
                self.negative = new.negative;
                self.full = new.full;
                self.part = new.part;
            }
        }
    }
}

impl<L: CurrencyLocale + Default> Mul<usize> for Currency<L> {
    type Output = Self;

    fn mul(self, rhs: usize) -> Self::Output {
        let rhs = rhs as f32;
        let tmp = (self.full as f32 + self.part as f32 / 100.0) * rhs;
        let mut result: Currency<L> = tmp.into();
        result.locale = self.locale;

        result
    }
}

impl<L: CurrencyLocale + Default> Mul<f32> for Currency<L> {
    type Output = Self;

    fn mul(self, rhs: f32) -> Self::Output {
        let tmp = (self.full as f32 + self.part as f32 / 100.0) * rhs;

        let mut result = Self::from(tmp);
        result.negative = self.negative ^ rhs.is_sign_negative();
        result.locale = self.locale;
        result
    }
}

impl<L: CurrencyLocale + Default> Mul<f64> for Currency<L> {
    type Output = Self;

    fn mul(self, rhs: f64) -> Self::Output {
        let tmp = (self.full as f64 + self.part as f64 / 100.0) * rhs;

        let mut result = Self::from(tmp);
        result.negative = self.negative ^ rhs.is_sign_negative();
        result.locale = self.locale;
        result
    }
}

impl<L: CurrencyLocale + Default> Div<usize> for Currency<L> {
    type Output = Self;

    fn div(self, rhs: usize) -> Self::Output {
        let mut tmp = self.full * 100 + self.part as usize;
        tmp /= rhs;
        let part = (tmp % 100) as u8;
        let full = tmp / 100;

        Self::new(self.negative, full, part, self.locale)
    }
}

impl<L: CurrencyLocale + Default> Div<f32> for Currency<L> {
    type Output = Self;

    fn div(self, rhs: f32) -> Self::Output {
        let mut tmp = self.full as f32 + self.part as f32 / 100.0;
        tmp /= rhs;

        let mut result = Self::from(tmp);
        result.negative = self.negative ^ rhs.is_sign_negative();
        result.locale = self.locale;
        result
    }
}

impl<L: CurrencyLocale + Default> Div<f64> for Currency<L> {
    type Output = Self;

    fn div(self, rhs: f64) -> Self::Output {
        let mut tmp = self.full as f64 + self.part as f64 / 100.0;
        tmp /= rhs;

        let mut result = Self::from(tmp);
        result.negative = self.negative ^ rhs.is_sign_negative();
        result.locale = self.locale;
        result
    }
}