use anyhow::anyhow;
use log::error;

use crate::{
    nexus::{NXMUrl, download_nxm},
    types::{ModConfig, RootConfig},
    unpacker::unpack,
};

/// Handles a nexus mod url. Downloads, unpacks and adds the mod to the config
pub fn handle_nxm(root_config: &mut RootConfig, raw_url: &str) -> anyhow::Result<()> {
    let Some(dl_location) = root_config.download_location() else {
        return Err(anyhow!("No download location set"));
    };

    let Some(api_key) = root_config.nexus_api_key() else {
        return Err(anyhow!("No API key provided"));
    };

    let Some(nxm_url) = NXMUrl::parse_url(raw_url) else {
        return Err(anyhow!("Failed to parse URL"));
    };

    let (dl_file, mod_info) = download_nxm(api_key, &nxm_url, dl_location)?;

    let mod_id = format!("{}-{}", mod_info.generate_id(), nxm_url.file);
    if root_config.game_by_id(&mod_id).is_some() {
        error!(
            "Generated mod id already exists. Pleas install downloaded mod manually. Downloaded at {}",
            &dl_file.to_string_lossy()
        );
        return Err(anyhow!("Mod with generated id already exists"));
    }

    let extract_to = root_config.mod_location().join(&mod_id);
    unpack(dl_file, extract_to)?;

    let file_id: u64 = nxm_url.file.parse()?;
    let new_mod = ModConfig::from_mod_info(&mod_id, &mod_id, &mod_info, file_id);

    root_config.add_mod(&new_mod);

    Ok(())
}