use std::{
    error::Error,
    fs::create_dir_all,
    fs::{remove_file, File},
};

use reqwest::Url;

mod error;
use error::TootubeError;

mod config;
pub use config::parse_toml;
use config::Config;

mod peertube;
use peertube::{get_latest_video, get_max_resolution_dl};

mod youtube;
use youtube::{create_resumable_upload, upload_video};

const TMP_DIR: &str = "/tmp/tootube";

fn dl_video(u: &str) -> Result<String, Box<dyn Error>> {
    // create dir
    create_dir_all(TMP_DIR)?;

    // get file
    let mut response = reqwest::blocking::get(u)?;

    // create local file
    let url = Url::parse(u)?;
    let dest_filename = url
        .path_segments()
        .ok_or_else(|| {
            TootubeError::new(&format!(
                "Cannot determine the destination filename for {u}"
            ))
        })?
        .last()
        .ok_or_else(|| {
            TootubeError::new(&format!(
                "Cannot determine the destination filename for {u}"
            ))
        })?;

    let dest_filepath = format!("{TMP_DIR}/{dest_filename}");

    let mut dest_file = File::create(&dest_filepath)?;

    response.copy_to(&mut dest_file)?;

    Ok(dest_filepath)
}

pub fn run(config: Config) {
    // Get the latest video object
    let latest_vid = get_latest_video(&config.peertube.base_url).unwrap_or_else(|e| {
        panic!("Cannot retrieve the latest video, something must have gone terribly wrong: {e}")
    });

    let dl_url = get_max_resolution_dl(latest_vid.streaming_playlists.as_ref().unwrap());

    let local_path = dl_video(&dl_url)
        .unwrap_or_else(|e| panic!("Cannot download video at URL {}: {}", dl_url, e));

    let resumable_upload_url = create_resumable_upload(&config.youtube, &latest_vid)
        .unwrap_or_else(|e| panic!("Cannot retrieve the upload’s resumable id: {e}"));

    upload_video(&local_path, &resumable_upload_url, &config.youtube)
        .unwrap_or_else(|e| panic!("Cannot resume upload!: {e}"));

    remove_file(&local_path).unwrap_or_else(|e| panic!("Cannot delete file {}: {}", local_path, e));
}