/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0.
 */

use aws_config::meta::region::RegionProviderChain;
use aws_sdk_kinesis::{Client, Error, Region, PKG_VERSION};
use structopt::StructOpt;

#[derive(Debug, StructOpt)]
struct Opt {
    /// The AWS Region.
    #[structopt(short, long)]
    region: Option<String>,

    /// Whether to display additional information
    #[structopt(short, long)]
    verbose: bool,
}

#[tokio::main]
async fn main() -> Result<(), Error> {
    tracing_subscriber::fmt::init();
    let Opt { region, verbose } = Opt::from_args();

    let region_provider = RegionProviderChain::first_try(region.map(Region::new))
        .or_default_provider()
        .or_else(Region::new("us-west-2"));
    let shared_config = aws_config::from_env().region(region_provider).load().await;
    let client = Client::new(&shared_config);

    println!();

    if verbose {
        println!("Kinesis version: {}", PKG_VERSION);
        println!("Region:          {:?}", shared_config.region().unwrap());
        println!();
    }

    let resp = client.list_streams().send().await?;

    println!("Stream names:");

    let streams = resp.stream_names.unwrap_or_default();
    for stream in &streams {
        println!("  {}", stream);
    }

    println!("Found {} stream(s)", streams.len());

    Ok(())
}
