use crate::config::SynspecInput;

/// Dynamic generator for SYNSPEC fort.55 parameter control file
pub fn generate_fort55_content(cfg: &SynspecInput) -> String {
    let line1 = format!("       {}      {}       {}", cfg.imode, cfg.idrv, cfg.ifreq);
    let line2 = "       1       0       0       0";
    let line3 = "       0       0       0       0       0";
    let line4 = "       1       1       0       0       0";
    let line5 = "       0       0       0";
    let line6 = format!(
        "    {:.1}    {:.1}      10       0  {}    {}",
        cfg.wstart, cfg.wend, cfg.rel_cutoff, cfg.abs_cutoff
    );
    let line7 = "       0       0";

    format!(
        "{}\n{}\n{}\n{}\n{}\n{}\n{}\n",
        line1, line2, line3, line4, line5, line6, line7
    )
}

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

    #[test]
    fn test_fort55_generation() {
        let cfg = SynspecInput {
            wstart: 3000.0,
            wend: 7000.0,
            imode: 0,
            idrv: 50,
            ifreq: 1,
            rel_cutoff: 0.0001,
            abs_cutoff: 0.01,
        };
        let content = generate_fort55_content(&cfg);
        assert!(content.contains("3000.0"));
        assert!(content.contains("7000.0"));
    }
}