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use crate::CheckBytesValueRaw;

use super::{context::*, value::*, value_raw::*};
use num_bigint::BigUint;
use std::fmt;

pub trait Checkable<V> {
    fn check(&self, value: V) -> bool;
}

impl Checkable<&[u8]> for BytesValue {
    fn check(&self, value: &[u8]) -> bool {
        self.value.as_slice() == value
    }
}

impl Checkable<&BigUint> for BigUintValue {
    fn check(&self, value: &BigUint) -> bool {
        &self.value == value
    }
}

impl Checkable<u64> for U64Value {
    fn check(&self, value: u64) -> bool {
        self.value == value
    }
}

#[derive(Debug)]
pub enum CheckValue<T: Default> {
    Star,
    Equal(T),
}

impl<T> CheckValue<T>
where
    T: InterpretableFrom<ValueSubTree> + Default,
{
    pub fn is_star(&self) -> bool {
        matches!(self, CheckValue::Star)
    }
}

impl<T> Default for CheckValue<T>
where
    T: InterpretableFrom<ValueSubTree> + Default,
{
    fn default() -> Self {
        CheckValue::Equal(T::default())
    }
}

impl<T> InterpretableFrom<CheckBytesValueRaw> for CheckValue<T>
where
    T: InterpretableFrom<ValueSubTree> + Default,
{
    fn interpret_from(from: CheckBytesValueRaw, context: &InterpreterContext) -> Self {
        match from {
            CheckBytesValueRaw::Unspecified => CheckValue::Equal(T::default()),
            CheckBytesValueRaw::Star => CheckValue::Star,
            CheckBytesValueRaw::Equal(bytes_value) => {
                CheckValue::Equal(T::interpret_from(bytes_value, context))
            },
        }
    }
}

impl<T: fmt::Display + Default> fmt::Display for CheckValue<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            CheckValue::Star => write!(f, "*"),
            CheckValue::Equal(eq_value) => eq_value.fmt(f),
        }
    }
}

impl<V, T> Checkable<V> for CheckValue<T>
where
    T: Checkable<V> + Default,
{
    fn check(&self, value: V) -> bool {
        match self {
            CheckValue::Star => true,
            CheckValue::Equal(eq) => eq.check(value),
        }
    }
}

impl Checkable<&[Vec<u8>]> for Vec<CheckValue<BytesValue>> {
    fn check(&self, values: &[Vec<u8>]) -> bool {
        if self.len() != values.len() {
            return false;
        }
        for (i, cv) in self.iter().enumerate() {
            if !cv.check(values[i].as_slice()) {
                return false;
            }
        }
        true
    }
}

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

    #[test]
    fn check_bytes() {
        let bv = BytesValue {
            value: b"abc".to_vec(),
            original: ValueSubTree::Str("abc".to_string()),
        };
        assert!(bv.check(&b"abc"[..]));

        let cb_eq = CheckValue::Equal(bv);
        assert!(cb_eq.check(&b"abc"[..]));
        assert!(!cb_eq.check(&b"abd"[..]));

        let cb_star: CheckValue<BytesValue> = CheckValue::Star;
        assert!(cb_star.check(&b"anything_really"[..]));
    }

    #[test]
    fn check_u64() {
        let u64v = U64Value {
            value: 123,
            original: ValueSubTree::Str("123".to_string()),
        };
        assert!(u64v.check(123u64));

        let cb_eq = CheckValue::Equal(u64v);
        assert!(cb_eq.check(123u64));

        let cb_star: CheckValue<U64Value> = CheckValue::Star;
        assert!(cb_star.check(1234567890));
    }
}