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use crate::convert::{Error, FromMrb, TryFromMrb};
use crate::value::types::{Ruby, Rust};
use crate::value::Value;
use crate::Mrb;

impl FromMrb<Vec<String>> for Value {
    type From = Rust;
    type To = Ruby;

    fn from_mrb(interp: &Mrb, value: Vec<String>) -> Self {
        Self::from_mrb(
            interp,
            value.iter().map(String::as_bytes).collect::<Vec<_>>(),
        )
    }
}

impl FromMrb<Vec<&str>> for Value {
    type From = Rust;
    type To = Ruby;

    fn from_mrb(interp: &Mrb, value: Vec<&str>) -> Self {
        Self::from_mrb(
            interp,
            value.into_iter().map(str::as_bytes).collect::<Vec<_>>(),
        )
    }
}

#[allow(clippy::use_self)]
// https://github.com/rust-lang/rust-clippy/issues/4143
impl TryFromMrb<Value> for Vec<String> {
    type From = Ruby;
    type To = Rust;

    unsafe fn try_from_mrb(
        interp: &Mrb,
        value: Value,
    ) -> Result<Self, Error<Self::From, Self::To>> {
        let values = <Vec<Vec<u8>>>::try_from_mrb(interp, value)?;
        let mut vec = Self::with_capacity(values.len());
        for item in values {
            let item = String::from_utf8(item).map_err(|_| Error {
                from: Ruby::String,
                to: Rust::String,
            })?;
            vec.push(item);
        }
        Ok(vec)
    }
}

impl FromMrb<Vec<Option<String>>> for Value {
    type From = Rust;
    type To = Ruby;

    fn from_mrb(interp: &Mrb, value: Vec<Option<String>>) -> Self {
        Self::from_mrb(
            interp,
            value
                .into_iter()
                .map(|item| item.map(String::into_bytes))
                .collect::<Vec<_>>(),
        )
    }
}

impl FromMrb<Vec<Option<&str>>> for Value {
    type From = Rust;
    type To = Ruby;

    fn from_mrb(interp: &Mrb, value: Vec<Option<&str>>) -> Self {
        Self::from_mrb(
            interp,
            value
                .into_iter()
                .map(|item| item.map(str::as_bytes))
                .collect::<Vec<_>>(),
        )
    }
}

#[allow(clippy::use_self)]
// https://github.com/rust-lang/rust-clippy/issues/4143
impl TryFromMrb<Value> for Vec<Option<String>> {
    type From = Ruby;
    type To = Rust;

    unsafe fn try_from_mrb(
        interp: &Mrb,
        value: Value,
    ) -> Result<Self, Error<Self::From, Self::To>> {
        let values = <Vec<Option<Vec<u8>>>>::try_from_mrb(interp, value)?;
        let mut vec = Self::with_capacity(values.len());
        for item in values {
            if let Some(item) = item {
                let item = String::from_utf8(item).map_err(|_| Error {
                    from: Ruby::String,
                    to: Rust::String,
                })?;
                vec.push(Some(item));
            } else {
                vec.push(None);
            }
        }
        Ok(vec)
    }
}

#[cfg(test)]
mod tests {
    use quickcheck_macros::quickcheck;
    use std::convert::TryFrom;

    use crate::convert::fixnum::Int;
    use crate::convert::{Error, FromMrb, TryFromMrb};
    use crate::eval::MrbEval;
    use crate::sys;
    use crate::value::types::{Ruby, Rust};
    use crate::value::Value;

    #[test]
    fn fail_convert() {
        let interp = crate::interpreter().expect("mrb init");
        // get a mrb_value that can't be converted to a primitive type.
        let value = interp.eval("Object.new").expect("eval");
        let expected = Error {
            from: Ruby::Object,
            to: Rust::Vec,
        };
        let result = unsafe { <Vec<Int>>::try_from_mrb(&interp, value) }.map(|_| ());
        assert_eq!(result, Err(expected));
    }

    #[allow(clippy::needless_pass_by_value)]
    #[quickcheck]
    fn convert_to_value(v: Vec<Int>) -> bool {
        let interp = crate::interpreter().expect("mrb init");
        let value = Value::from_mrb(&interp, v.clone());
        let inner = value.inner();
        let size = i64::try_from(v.len()).expect("vec size");
        unsafe { sys::mrb_sys_ary_len(inner) == size }
    }

    #[allow(clippy::needless_pass_by_value)]
    #[quickcheck]
    fn roundtrip(v: Vec<Int>) -> bool {
        let interp = crate::interpreter().expect("mrb init");
        let value = Value::from_mrb(&interp, v.clone());
        unsafe { <Vec<Int>>::try_from_mrb(&interp, value) == Ok(v) }
    }
}