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use crate::structure::GValue;
use crate::structure::{Either2, TextP, T};
use crate::structure::{IntoPredicate, P};

pub enum HasStepKey {
    Str(String),
    T(T),
}

impl Into<HasStepKey> for T {
    fn into(self) -> HasStepKey {
        HasStepKey::T(self)
    }
}

impl Into<HasStepKey> for String {
    fn into(self) -> HasStepKey {
        HasStepKey::Str(self)
    }
}

impl Into<HasStepKey> for &str {
    fn into(self) -> HasStepKey {
        HasStepKey::Str(String::from(self))
    }
}

pub struct HasStep {
    label: Option<String>,
    key: HasStepKey,
    predicate: Option<Either2<P, TextP>>,
}

impl From<HasStep> for Vec<GValue> {
    fn from(step: HasStep) -> Self {
        let mut params: Vec<GValue> = vec![];

        if let Some(s) = step.label {
            params.push(Into::into(s));
        }

        match step.key {
            HasStepKey::Str(key) => params.push(Into::into(key)),
            HasStepKey::T(key) => params.push(Into::into(key)),
        };

        if let Some(p) = step.predicate {
            params.push(Into::into(p));
        }

        params
    }
}

impl<A, B> From<(A, B)> for HasStep
where
    A: Into<HasStepKey>,
    B: IntoPredicate,
{
    fn from(param: (A, B)) -> Self {
        HasStep {
            label: None,
            key: param.0.into(),
            predicate: Some(param.1.into_predicate()),
        }
    }
}

impl<A, B, C> From<(A, B, C)> for HasStep
where
    A: Into<String>,
    B: Into<HasStepKey>,
    C: IntoPredicate,
{
    fn from(param: (A, B, C)) -> Self {
        HasStep {
            label: Some(param.0.into()),
            key: param.1.into(),
            predicate: Some(param.2.into_predicate()),
        }
    }
}

impl From<String> for HasStep {
    fn from(param: String) -> Self {
        HasStep {
            label: None,
            key: HasStepKey::Str(param),
            predicate: None,
        }
    }
}

impl From<&str> for HasStep {
    fn from(param: &str) -> Self {
        HasStep {
            label: None,
            key: HasStepKey::Str(String::from(param)),
            predicate: None,
        }
    }
}