use anyhow::Result;
use reqsign_aws_v4::{Config, DefaultCredentialProvider, RequestSigner, EMPTY_STRING_SHA256};
use reqsign_core::{Context, Signer};
use reqsign_file_read_tokio::TokioFileRead;
use reqsign_http_send_reqwest::ReqwestHttpSend;
use reqwest::Client;
use std::sync::Arc;

#[tokio::main]
async fn main() -> Result<()> {
    // Create HTTP client and context
    let client = Client::new();
    let ctx = Context::new(TokioFileRead, ReqwestHttpSend::new(client.clone()));
    
    // Configure AWS credentials (loads from env by default)
    let config = Config::default().from_env(&ctx);
    let loader = DefaultCredentialProvider::new(Arc::new(config));
    
    // Create request signer for S3
    let builder = RequestSigner::new("s3", "us-east-1");
    let signer = Signer::new(ctx, loader, builder);
    
    // Construct and sign the request
    let req = http::Request::get("https://s3.amazonaws.com/testbucket")
        .header("x-amz-content-sha256", EMPTY_STRING_SHA256)
        .body(reqwest::Body::from(""))?;
    let (mut parts, body) = req.into_parts();
    
    // Sign the request
    signer.sign(&mut parts, None).await?;
    let req = http::Request::from_parts(parts, body).try_into()?;
    
    // Send the signed request
    let resp = client.execute(req).await?;
    println!("resp got status: {}", resp.status());
    Ok(())
}