imessage-database 5.0.1

/*!
 Default local paths for Messages data.
*/

use std::{
    borrow::Cow,
    env::{home_dir, var_os},
    path::PathBuf,
};

use crate::tables::table::DEFAULT_PATH_MACOS;

/// Return the default macOS Messages database path.
///
/// Resolves the home directory with [`std::env::home_dir`]: `HOME` on Unix and `USERPROFILE` on
/// Windows. Returns `None` when neither the environment nor the OS reports a home directory.
///
/// # Example:
///
/// ```
/// use imessage_database::util::dirs::default_db_path;
///
/// let path = default_db_path().unwrap();
/// println!("{path:?}");
/// ```
#[must_use]
pub fn default_db_path() -> Option<PathBuf> {
    home_dir().map(|home| home.join(DEFAULT_PATH_MACOS))
}

/// Return the host's default parent directories for per-device backups from Finder, iTunes,
/// and Apple Devices.
///
/// macOS: `~/Library/Application Support/MobileSync/Backup`. Windows:
/// `%APPDATA%\Apple Computer\MobileSync\Backup` for iTunes from Apple and
/// `%USERPROFILE%\Apple\MobileSync\Backup` for iTunes and Apple Devices from the Microsoft Store.
/// On Linux, return an empty list; no standard backup location is defined.
///
/// # Example:
///
/// ```
/// use imessage_database::util::dirs::default_backup_roots;
///
/// for root in default_backup_roots() {
///     println!("{}", root.display());
/// }
/// ```
#[must_use]
pub fn default_backup_roots() -> Vec<PathBuf> {
    let mut roots = Vec::new();
    if cfg!(target_os = "macos")
        && let Some(home) = home_dir()
    {
        roots.push(
            home.join("Library")
                .join("Application Support")
                .join("MobileSync")
                .join("Backup"),
        );
    }
    if cfg!(target_os = "windows") {
        if let Some(appdata) = var_os("APPDATA") {
            roots.push(
                PathBuf::from(appdata)
                    .join("Apple Computer")
                    .join("MobileSync")
                    .join("Backup"),
            );
        }
        if let Some(home) = home_dir() {
            roots.push(home.join("Apple").join("MobileSync").join("Backup"));
        }
    }
    roots
}

/// Replace a leading `~` with the current user's home directory.
///
/// macOS stores attachment paths with a literal `~` prefix. The path is returned unchanged when it
/// has no `~` prefix or when the home directory is unknown.
///
/// # Example:
///
/// ```
/// use imessage_database::util::dirs::expand_home;
///
/// let path = expand_home("~/Library/Messages");
/// println!("{path}");
/// ```
#[must_use]
pub fn expand_home(path: &str) -> Cow<'_, str> {
    match (path.strip_prefix('~'), home_dir()) {
        (Some(rest), Some(home)) => Cow::Owned(format!("{}{rest}", home.display())),
        _ => Cow::Borrowed(path),
    }
}

#[cfg(test)]
mod tests {
    use std::{borrow::Cow, env::home_dir};

    use crate::{
        tables::table::DEFAULT_PATH_MACOS, util::dirs::default_db_path, util::dirs::expand_home,
    };

    #[test]
    fn default_db_path_is_under_home() {
        let home = home_dir().unwrap();
        assert_eq!(default_db_path().unwrap(), home.join(DEFAULT_PATH_MACOS));
    }

    #[test]
    fn expand_home_replaces_leading_tilde() {
        let home = home_dir().unwrap();
        assert_eq!(
            expand_home("~/Library/Messages"),
            format!("{}/Library/Messages", home.display())
        );
    }

    #[test]
    fn expand_home_leaves_other_paths_borrowed() {
        assert!(matches!(
            expand_home("/Library/Messages"),
            Cow::Borrowed("/Library/Messages")
        ));
        assert!(matches!(expand_home("a/~/b"), Cow::Borrowed("a/~/b")));
    }
}