// example to show fetching a URL and saving to a file

use std::path::Path;

#[tokio::main]
async fn main() -> kxio::Result<()> {
    let net = kxio::net::new();
    let fs = kxio::fs::temp()?;

    let url = "https://git.kemitix.net/kemitix/kxio/raw/branch/main/README.md";
    let file_path = fs.base().join("README.md");

    download_and_save(url, &file_path, &fs, &net).await?;

    print_file(&file_path, &fs)?;

    Ok(())
}

async fn download_and_save(
    url: &str,
    file_path: &Path,
    fs: &kxio::fs::FileSystem,
    net: &kxio::net::Net,
) -> kxio::Result<()> {
    println!("fetching: {url}");
    let request = net.client().get(url);
    let response = net.send(request).await?;
    let body = response.text().await?;
    println!("fetched {} bytes", body.bytes().len());

    println!("writing file: {}", file_path.display());
    let file = fs.file(file_path);
    file.write(body)?;

    Ok(())
}

fn print_file(file_path: &Path, fs: &kxio::fs::FileSystem) -> kxio::Result<()> {
    println!("reading file: {}", file_path.display());
    let file = fs.file(file_path);
    let reader = file.reader()?;
    let contents = reader.as_str();
    println!("{contents}");

    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[tokio::test]
    async fn should_save_remote_body() {
        //given
        let net = kxio::net::mock();
        let url = "http://localhost:8080";
        net.on(net.client().get(url).build().expect("request"))
            .respond(
                net.response()
                    .body("contents")
                    .expect("response body")
                    .into(),
            )
            .expect("mock");

        let fs = kxio::fs::temp().expect("temp fs");
        let file_path = fs.base().join("foo");

        //when
        download_and_save(url, &file_path, &fs, &net.into())
            .await
            .expect("system under test");

        //then
        let file = fs.file(&file_path);
        let reader = file.reader().expect("reader");
        let contents = reader.as_str();

        assert_eq!(contents, "contents");
    }
}