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use crate::Regulation;
use crate::_aeon_parser::RegulationTemp;
use std::convert::TryFrom;

impl TryFrom<&str> for RegulationTemp {
    type Error = String;

    fn try_from(value: &str) -> Result<Self, Self::Error> {
        if let Some((r, m, o, t)) = Regulation::try_from_string(value) {
            Ok(RegulationTemp {
                regulator: r,
                target: t,
                observable: o,
                monotonicity: m,
            })
        } else {
            Err(format!("String \"{}\" is not a valid regulation.", value))
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::Monotonicity::{Activation, Inhibition};
    use crate::_aeon_parser::RegulationTemp;
    use std::convert::TryFrom;

    #[test]
    fn parse_regulation_valid() {
        assert_eq!(
            RegulationTemp {
                regulator: "abc".to_string(),
                target: "123".to_string(),
                observable: true,
                monotonicity: Some(Activation)
            },
            RegulationTemp::try_from("  abc -> 123 ").unwrap()
        );

        assert_eq!(
            RegulationTemp {
                regulator: "abc".to_string(),
                target: "123".to_string(),
                observable: false,
                monotonicity: Some(Activation)
            },
            RegulationTemp::try_from("  abc ->? 123 ").unwrap()
        );

        assert_eq!(
            RegulationTemp {
                regulator: "hello_world".to_string(),
                target: "world_hello_123".to_string(),
                observable: true,
                monotonicity: Some(Inhibition)
            },
            RegulationTemp::try_from("hello_world -| world_hello_123").unwrap()
        );

        assert_eq!(
            RegulationTemp {
                regulator: "hello_world".to_string(),
                target: "world_hello_123".to_string(),
                observable: false,
                monotonicity: Some(Inhibition)
            },
            RegulationTemp::try_from("hello_world -|? world_hello_123").unwrap()
        );

        assert_eq!(
            RegulationTemp {
                regulator: "abc".to_string(),
                target: "abc".to_string(),
                observable: true,
                monotonicity: None
            },
            RegulationTemp::try_from("abc -? abc").unwrap()
        );

        assert_eq!(
            RegulationTemp {
                regulator: "abc".to_string(),
                target: "abc".to_string(),
                observable: false,
                monotonicity: None
            },
            RegulationTemp::try_from("abc -?? abc").unwrap()
        );
    }

    #[test]
    fn parse_regulation_invalid() {
        assert!(RegulationTemp::try_from("").is_err());
        assert!(RegulationTemp::try_from("var1 var2 -> var3").is_err());
        assert!(RegulationTemp::try_from("var -| v?r").is_err());
        assert!(RegulationTemp::try_from(" -? foo").is_err());
        assert!(RegulationTemp::try_from("hello -?> there").is_err());
        assert!(RegulationTemp::try_from("world -??? is").is_err());
        assert!(RegulationTemp::try_from("   te - ? st").is_err());
    }
}