//! Reconcile the OS login entry with the saved setting.
use std::{io, path::Path};

pub fn reconcile(enabled: bool) -> io::Result<()> {
    apply(enabled, &std::env::current_exe()?)
}

#[cfg(target_os = "linux")]
fn apply(enabled: bool, executable: &Path) -> io::Result<()> {
    let path = dirs::config_dir()
        .ok_or_else(|| io::Error::other("No config directory"))?
        .join("autostart/clipbin.desktop");
    if enabled {
        std::fs::create_dir_all(path.parent().unwrap())?;
        let executable = executable
            .to_str()
            .ok_or_else(|| io::Error::other("Executable path is not UTF-8"))?;
        // Desktop Entry Exec quoting includes reserved characters and doubles %.
        let quoted = executable
            .replace('\\', "\\\\")
            .replace('"', "\\\"")
            .replace('`', "\\`")
            .replace('$', "\\$")
            .replace('%', "%%");
        let escaped = quoted
            .replace('\\', "\\\\")
            .replace('\n', "\\n")
            .replace('\r', "\\r")
            .replace('\t', "\\t");
        std::fs::write(
            path,
            format!(
                "[Desktop Entry]\nType=Application\nName=Clipbin\nExec=\"{escaped}\" --background\nTerminal=false\n"
            ),
        )
    } else {
        match std::fs::remove_file(path) {
            Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(()),
            result => result,
        }
    }
}

#[cfg(windows)]
fn apply(enabled: bool, executable: &Path) -> io::Result<()> {
    use winreg::{RegKey, enums::HKEY_CURRENT_USER};
    let (key, _) = RegKey::predef(HKEY_CURRENT_USER)
        .create_subkey(r"Software\Microsoft\Windows\CurrentVersion\Run")?;
    if enabled {
        key.set_value(
            "Clipbin",
            &format!("\"{}\" --background", executable.display()),
        )
    } else {
        match key.delete_value("Clipbin") {
            Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(()),
            result => result,
        }
    }
}