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//! Contains the [`LogId`] struct.

#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
pub struct LogId {
    pub(crate) crate_name: &'static str,

    pub(crate) module_path: &'static str,

    pub(crate) identifier: &'static str,

    pub(crate) log_level: LogLevel,
}

impl evident::publisher::Id for LogId {}

impl LogId {
    pub const fn new(
        crate_name: &'static str,
        module_path: &'static str,
        identifier: &'static str,
        log_level: LogLevel,
    ) -> Self {
        LogId {
            crate_name,
            module_path,
            identifier,
            log_level,
        }
    }

    pub fn get_crate_name(&self) -> &'static str {
        self.crate_name
    }
    pub fn get_module_path(&self) -> &'static str {
        self.module_path
    }

    pub fn get_identifier(&self) -> &'static str {
        self.identifier
    }

    pub fn get_log_level(&self) -> LogLevel {
        self.log_level
    }
}

impl std::fmt::Display for LogId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "{}: {}::{}::{}",
            self.log_level, self.crate_name, self.module_path, self.identifier
        )
    }
}

/// Log level a [`LogId`] may represent.
#[derive(Debug, Default, PartialEq, Eq, Clone, Copy, std::hash::Hash)]
pub enum LogLevel {
    Error,
    Warn,
    Info,
    #[default]
    Debug,
    Trace,
}

impl std::fmt::Display for LogLevel {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let s = match self {
            LogLevel::Error => "ERR",
            LogLevel::Warn => "WARN",
            LogLevel::Info => "INFO",
            LogLevel::Debug => "DEBUG",
            LogLevel::Trace => "TRACE",
        };

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

/// Macro to create a [`LogId`] with a custom identifier and [`LogLevel`].
///
/// **Note:** The identifier must be a string literal.
///
/// ## Usage
///
/// ```
/// use logid_core::{new_log_id, log_id::LogLevel};
///
/// let id = new_log_id!("custom_ident", LogLevel::Debug);
/// ```
#[macro_export]
macro_rules! new_log_id {
    ($identifier:literal, $log_level:expr) => {
        $crate::log_id::LogId::new(
            env!("CARGO_PKG_NAME"),
            module_path!(),
            $identifier,
            $log_level,
        )
    };
}

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

    #[test]
    fn create_log_id_with_macro() {
        let log_id = new_log_id!("custom_ident", LogLevel::Debug);

        assert_eq!(
            log_id.crate_name,
            env!("CARGO_PKG_NAME"),
            "Crate name was not set correctly using `log_id!()` macro."
        );
        assert_eq!(
            log_id.module_path,
            module_path!(),
            "Module path was not set correctly using `log_id!()` macro."
        );
        assert_eq!(
            log_id.identifier, "custom_ident",
            "Identifier was not set correctly using `log_id!()` macro."
        );
        assert_eq!(
            log_id.log_level,
            LogLevel::Debug,
            "Log level was not set correctly using `log_id!()` macro."
        );
    }
}