use crate::app_config::AppConfig;
use crate::ota::ota_update::{OTAPlatform, OTAUpdate};
use crate::utils::files_utils;
use std::os::unix::fs::MetadataExt;
use std::str::FromStr;

/// Check out whether a given update exists or not
pub fn update_exists(platform: OTAPlatform, version: &semver::Version) -> anyhow::Result<bool> {
    Ok(AppConfig::get()
        .path_ota_update(platform, version)
        .is_file())
}

/// Save a new firmware update
pub fn save_update(
    platform: OTAPlatform,
    version: &semver::Version,
    update: &[u8],
) -> anyhow::Result<()> {
    let path = AppConfig::get().path_ota_update(platform, version);
    files_utils::create_directory_if_missing(path.parent().unwrap())?;

    std::fs::write(path, update)?;

    Ok(())
}

/// Get the list of OTA software updates for a platform
pub fn get_ota_updates_for_platform(platform: OTAPlatform) -> anyhow::Result<Vec<OTAUpdate>> {
    let ota_path = AppConfig::get().ota_platform_dir(platform);

    let mut out = Vec::new();

    for e in std::fs::read_dir(ota_path)? {
        let e = e?;

        out.push(OTAUpdate {
            platform,
            version: semver::Version::from_str(e.file_name().to_str().unwrap_or("bad"))?,
            file_size: e.metadata()?.size(),
        });
    }

    Ok(out)
}