anchor-chain 0.4.2

use futures::future::BoxFuture;
use std::collections::HashMap;

use anchor_chain::{
    nodes::prompt::Prompt, parallel_node::ParallelNode, ChainBuilder, Claude3Bedrock, OpenAIModel,
};

#[tokio::main]
async fn main() {
    let gpt3 =
        Box::new(OpenAIModel::new_gpt3_5_turbo("You are a helpful assistant".to_string()).await);
    let claude3 = Box::new(Claude3Bedrock::new("You are a helpful assistant".to_string()).await);

    let select_output_fn = Box::new(|outputs: Vec<String>| -> BoxFuture<Result<String, _>> {
        Box::pin(async move {
            let labeled_outputs = outputs
                .iter()
                .enumerate()
                .map(|(i, output)| format!("<output{}>\n{}\n</output{}>", i + 1, output, i + 1))
                .collect::<Vec<String>>();
            let decision_chain = ChainBuilder::new()
                .link(Prompt::new(
                    "Decide which input is the most helpful. Return only \
                    the output within between the <outputN></outputN> tags without outputting the \
                    tags themselves. Ensure the output is returned verbatim without any \
                    commentary.\n{{ input }}",
                ))
                .link(OpenAIModel::new_gpt3_5_turbo_instruct().await)
                .build();
            decision_chain
                .process(HashMap::from([(
                    "input".to_string(),
                    labeled_outputs.join("\n\n"),
                )]))
                .await
        })
    });

    let chain = ChainBuilder::new()
        .link(Prompt::new("{{ input }}"))
        .link(ParallelNode::new(vec![gpt3, claude3], select_output_fn))
        .build();

    let output = chain
        .process(HashMap::from([(
            "input".to_string(),
            "Write a hello world program in Rust".to_string(),
        )]))
        .await
        .expect("Error processing chain");
    println!("{}", output);
}