os-identifier 0.4.0

const PRODUCT: &str = "Windows Server";
const VENDOR: &str = "Microsoft";

/// WindowsServer2019ff covers Windows Server 2019, 2022, and 2025.
///
/// see [Windows Server release information](https://learn.microsoft.com/en-us/windows/release-health/windows-server-release-info)
#[derive(Debug)]
pub(crate) struct WindowsServer2019ff {
    vendor: String,
    product: String,
    release: Option<Release>,
    editions: Editions,
    #[allow(dead_code)]
    service_channel: ServiceChannel,
}

impl WindowsServer2019ff {
    pub(crate) fn build(product: &str, release: Option<Release>, service_channel: ServiceChannel) -> WindowsServer2019ff {
        WindowsServer2019ff {
            vendor: VENDOR.to_string(),
            product: format!("{} {}", PRODUCT.to_string(), product),
            editions: Editions(vec![]),
            release,
            service_channel,
        }
    }

    pub(super) fn vendor(&self) -> &str {
        self.vendor.as_str()
    }

    pub(super) fn product(&self) -> &str {
        self.product.as_str()
    }

    pub(super) fn release(&self) -> String {
        match &self.release {
            Some(release) => release.to_string(),
            None => "".to_string(),
        }
    }

    pub(crate) fn editions(mut self, editions: Editions) -> WindowsServer2019ff {
        self.editions = editions;
        self
    }

    pub(super) fn is_enterprise(&self) -> bool {
        false
    }

    pub(super) fn is_lts(&self) -> bool {
        self.service_channel.is_lts()
    }
    
    pub(super) fn to_string(&self) -> Vec<String> {
        let out = self
            .editions
            .0
            .iter()
            .map(|edition| {
                if self.release.is_none() {
                    format!(
                        "{} {} {edition}",
                        self.vendor, self.product
                    )
                } else {
                    let release = self.release.clone().unwrap();
                    format!(
                        "{} {} {edition} {release}",
                        self.vendor, self.product
                    )
                }
            })
            .collect();

        out
    }
}

impl TryFrom<&str> for WindowsServer2019ff {
    type Error = String;

    fn try_from(value: &str) -> Result<Self, Self::Error> {
        if let Ok(label) = crate::parser::endoflife::EndOfLifeLabel::try_from(value) {
            crate::parser::endoflife::windows::WindowsServer2019ffParser::parse(&label)
        } else {
            let label = crate::parser::generic::GenericLabel::from(value);
            crate::parser::generic::windows::WindowsServer2019ffParser::parse(&label)
        }
    }
}

#[derive(Clone, Debug)]
pub(crate) struct Release(String);

impl Release {}

impl From<&str> for Release {
    fn from(value: &str) -> Self {
        Release(value.to_uppercase())
    }
}

impl std::fmt::Display for Release {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

#[derive(Debug)]
pub(crate) struct Editions(pub(crate) Vec<Edition>);

impl Editions {
    pub(crate) fn all() -> Self {
        Editions(vec![
            Edition::Datacenter,
            Edition::Standard,
        ])
    }

    #[allow(dead_code)]
    fn contains(&self, edition: Edition) -> bool {
        self.0.contains(&edition)
    }

    #[allow(dead_code)]
    fn len(&self) -> usize {
        self.0.len()
    }
}

#[derive(PartialEq, Debug)]
pub(crate) enum Edition {
    Datacenter,
    Standard,
}

impl std::fmt::Display for Edition {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let out = match self {
            Edition::Datacenter => "Datacenter",
            Edition::Standard => "Standard",
        };

        write!(f, "{}", out.to_string())
    }
}

#[derive(PartialEq, Debug)]
pub(crate) enum ServiceChannel {
    LTSC,
}

impl ServiceChannel {
    #[allow(dead_code)]
    fn is_default(&self) -> bool {
        match self {
            ServiceChannel::LTSC => true,
        }
    }

    fn is_lts(&self) -> bool {
        match self {
            ServiceChannel::LTSC => true,
        }
    }
}

impl Default for ServiceChannel {
    fn default() -> Self {
        ServiceChannel::LTSC
    }
}

impl std::fmt::Display for ServiceChannel {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let out = match self {
            ServiceChannel::LTSC => "LTSB",
        };

        write!(f, "{}", out)
    }
}

impl From<&str> for ServiceChannel {
    fn from(value: &str) -> Self {
        match value {
            _ => ServiceChannel::LTSC,
        }
    }
}

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

    #[test]
    fn test_from_string_2019() {
        let label = WindowsServer2019ff::try_from("windows-server-2019").unwrap();

        assert_eq!(label.vendor, "Microsoft".to_string());
        assert_eq!(label.product, "Windows Server 2019".to_string());
        assert_eq!(label.editions.len(), Editions::all().len());
        assert!(label.release.is_none());
    }

    #[test]
    fn test_from_string_2022() {
        let label = WindowsServer2019ff::try_from("windows-server-2022").unwrap();

        assert_eq!(label.vendor, "Microsoft".to_string());
        assert_eq!(label.product, "Windows Server 2022".to_string());
        assert_eq!(label.editions.len(), Editions::all().len());
        assert!(label.release.is_none());
    }

    #[test]
    fn test_from_string_2025() {
        let label = WindowsServer2019ff::try_from("windows-server-2025").unwrap();

        assert_eq!(label.vendor, "Microsoft".to_string());
        assert_eq!(label.product, "Windows Server 2025".to_string());
        assert_eq!(label.editions.len(), Editions::all().len());
        assert!(label.release.is_none());
    }
}