romm-cli 0.22.0

use crate::types::Rom;

/// One game entry for list display: same `name` (base + updates/DLC) shown once.
#[derive(Debug, Clone)]
pub struct RomGroup {
    pub name: String,
    pub primary: Rom,
    pub others: Vec<Rom>,
}

/// Group ROMs by game name; primary is the "base" file (prefer over
/// `"[Update]"` / `"[DLC]"` tags in `fs_name` when present).
pub fn group_roms_by_name(items: &[Rom]) -> Vec<RomGroup> {
    use std::collections::HashMap;
    let mut by_name: HashMap<String, Vec<Rom>> = HashMap::new();
    for rom in items {
        by_name
            .entry(rom.name.clone())
            .or_default()
            .push(rom.clone());
    }
    let mut groups = Vec::with_capacity(by_name.len());
    for (name, mut roms) in by_name {
        roms.sort_by(|a, b| {
            let a_extra = a.fs_name.to_lowercase().contains("[update]")
                || a.fs_name.to_lowercase().contains("[dlc]");
            let b_extra = b.fs_name.to_lowercase().contains("[update]")
                || b.fs_name.to_lowercase().contains("[dlc]");
            match (a_extra, b_extra) {
                (false, true) => std::cmp::Ordering::Less,
                (true, false) => std::cmp::Ordering::Greater,
                _ => std::cmp::Ordering::Equal,
            }
        });
        let primary = roms.remove(0);
        groups.push(RomGroup {
            name,
            primary,
            others: roms,
        });
    }
    groups.sort_by(|a, b| a.name.cmp(&b.name));
    groups
}

/// Human-readable file size.
pub fn format_size(bytes: u64) -> String {
    const KB: u64 = 1024;
    const MB: u64 = KB * 1024;
    const GB: u64 = MB * 1024;
    if bytes >= GB {
        format!("{:.2} GB", bytes as f64 / GB as f64)
    } else if bytes >= MB {
        format!("{:.2} MB", bytes as f64 / MB as f64)
    } else if bytes >= KB {
        format!("{:.2} KB", bytes as f64 / KB as f64)
    } else {
        format!("{} B", bytes)
    }
}

/// Make a filename safe for the local filesystem.
pub fn sanitize_filename(name: &str) -> String {
    name.chars()
        .map(|c| {
            if c.is_ascii_alphanumeric() || c == '.' || c == '-' || c == '_' || c == ' ' {
                c
            } else {
                '_'
            }
        })
        .collect()
}

/// Truncate a string to `max` chars, appending "…" if trimmed.
pub fn truncate(s: &str, max: usize) -> String {
    let s = s.trim();
    if s.chars().count() <= max {
        s.to_string()
    } else {
        format!(
            "{}…",
            s.chars().take(max.saturating_sub(1)).collect::<String>()
        )
    }
}

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

    fn rom(id: u64, name: &str, fs_name: &str) -> Rom {
        Rom {
            id,
            platform_id: 1,
            platform_slug: None,
            platform_fs_slug: None,
            platform_custom_name: Some("NES".to_string()),
            platform_display_name: Some("NES".to_string()),
            fs_name: fs_name.to_string(),
            fs_name_no_tags: name.to_string(),
            fs_name_no_ext: name.to_string(),
            fs_extension: "zip".to_string(),
            fs_path: format!("/roms/{}.zip", id),
            fs_size_bytes: 1,
            name: name.to_string(),
            slug: None,
            summary: None,
            path_cover_small: None,
            path_cover_large: None,
            url_cover: None,
            is_unidentified: false,
            is_identified: true,
        }
    }

    #[test]
    fn group_roms_prefers_base_file_as_primary() {
        let input = vec![
            rom(1, "Game A", "Game A [Update].zip"),
            rom(2, "Game A", "Game A [DLC].zip"),
            rom(3, "Game A", "Game A.zip"),
            rom(4, "Game B", "Game B.zip"),
        ];

        let groups = group_roms_by_name(&input);
        assert_eq!(groups.len(), 2);

        let game_a = groups.iter().find(|g| g.name == "Game A").expect("group");
        assert_eq!(game_a.primary.fs_name, "Game A.zip");
        assert_eq!(game_a.others.len(), 2);
    }
}