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use crate::structure::either::Either2;
use crate::structure::text_p::TextP;
use crate::{GValue, ToGValue};

#[derive(Debug, PartialEq, Clone)]
pub struct P {
    pub(crate) operator: String,
    pub(crate) value: Box<GValue>,
}

impl P {
    pub fn operator(&self) -> &String {
        &self.operator
    }

    pub fn value(&self) -> &GValue {
        &self.value
    }

    pub(crate) fn new<T>(operator: T, value: GValue) -> P
    where
        T: Into<String>,
    {
        P {
            operator: operator.into(),
            value: Box::new(value),
        }
    }
    pub fn eq<V>(value: V) -> P
    where
        V: ToGValue,
    {
        P::new("eq", value.to_gvalue())
    }

    pub fn neq<V>(value: V) -> P
    where
        V: ToGValue,
    {
        P::new("neq", value.to_gvalue())
    }

    pub fn gt<V>(value: V) -> P
    where
        V: ToGValue,
    {
        P::new("gt", value.to_gvalue())
    }

    pub fn gte<V>(value: V) -> P
    where
        V: ToGValue,
    {
        P::new("gte", value.to_gvalue())
    }

    pub fn lt<V>(value: V) -> P
    where
        V: ToGValue,
    {
        P::new("lt", value.to_gvalue())
    }

    pub fn lte<V>(value: V) -> P
    where
        V: ToGValue,
    {
        P::new("lte", value.to_gvalue())
    }

    pub fn within<V>(value: V) -> P
    where
        V: IntoRange,
    {
        P::new("within", value.into_range().values.into())
    }
}

pub trait IntoPredicate {
    fn into_predicate(self) -> Either2<P, TextP>;
}

impl<T: ToGValue> IntoPredicate for T {
    fn into_predicate(self) -> Either2<P, TextP> {
        let val = self.to_gvalue();
        match val {
            GValue::P(ref p) => Either2::A(p.clone()),
            GValue::TextP(ref p) => Either2::B(p.clone()),
            _ => Either2::A(P::new("eq", val)),
        }
    }
}

pub struct Range {
    values: Vec<GValue>,
}

pub trait IntoRange {
    fn into_range(self) -> Range;
}

impl<T> IntoRange for (T, T)
where
    T: ToGValue,
{
    fn into_range(self) -> Range {
        let v1 = self.0.to_gvalue();
        let v2 = self.1.to_gvalue();

        Range {
            values: vec![v1, v2],
        }
    }
}

impl<T> IntoRange for Vec<T>
where
    T: ToGValue,
{
    fn into_range(self) -> Range {
        Range {
            values: self.into_iter().map(|e| e.to_gvalue()).collect(),
        }
    }
}