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use serde::{Deserialize, Serialize};
use strum::{Display, EnumIter, EnumString, IntoEnumIterator};

/// The era that the software is running or will run
#[derive(
    Display, EnumString, EnumIter, Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize,
)]
#[serde(rename_all = "lowercase")]
#[strum(serialize_all = "lowercase")]
pub enum SupportedEra {
    /// Thales era
    Thales,

    /// Pythagoras era
    Pythagoras,
}

impl SupportedEra {
    /// Retrieve the list of supported eras
    pub fn eras() -> Vec<Self> {
        Self::iter().collect()
    }

    /// Retrieve a dummy era (for test only)
    pub fn dummy() -> Self {
        Self::eras().first().unwrap().to_owned()
    }
}

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

    #[test]
    fn correct_number_of_eras() {
        let total_eras = SupportedEra::eras().len();

        assert!(total_eras > 0);
        assert!(total_eras <= 2);
    }

    #[test]
    fn from_str() {
        let supported_era = SupportedEra::from_str(&SupportedEra::dummy().to_string())
            .expect("This era name should be supported.");

        assert_eq!(SupportedEra::dummy(), supported_era);
    }
}