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use http_req::{
    request::{Method, Request},
    uri::Uri,
};
use serde::Serialize;
use urlencoding::encode;

use crate::Retry;

/// The input type for the embeddings.
///
/// For more detail about parameters, please refer to
/// [OpenAI docs](https://platform.openai.com/docs/api-reference/embeddings/create)
///
#[derive(Debug, Serialize)]
pub enum EmbeddingsInput {
    String(String),
    Vec(Vec<String>),
}

impl crate::OpenAIFlows {
    /// Create embeddings from the provided input.
    ///
    /// `params` is a [EmbeddingsRequest] object.
    ///
    /// If you have not connected your OpenAI account with [Flows.network platform](https://flows.network),
    /// you will receive an error in the flow's building log or running log.
    ///
    pub async fn create_embeddings(&self, input: EmbeddingsInput) -> Result<Vec<Vec<f64>>, String> {
        self.keey_trying(|account| create_embeddings_inner(account, &input))
    }
}

fn create_embeddings_inner(account: &str, input: &EmbeddingsInput) -> Retry<Vec<Vec<f64>>> {
    unsafe {
        let mut flows_user = Vec::<u8>::with_capacity(100);
        let c = crate::get_flows_user(flows_user.as_mut_ptr());
        flows_user.set_len(c as usize);
        let flows_user = String::from_utf8(flows_user).unwrap();

        let mut writer = Vec::new();
        let uri = format!(
            "{}/{}/create_embeddings?account={}",
            crate::OPENAI_API_PREFIX.as_str(),
            flows_user,
            encode(account),
        );
        let uri = Uri::try_from(uri.as_str()).unwrap();
        let body = match input {
            EmbeddingsInput::String(ref s) => serde_json::to_vec(&s).unwrap_or_default(),
            EmbeddingsInput::Vec(ref v) => serde_json::to_vec(&v).unwrap_or_default(),
        };
        match Request::new(&uri)
            .method(Method::POST)
            .header("Content-Type", "application/json")
            .header("Content-Length", &body.len())
            .body(&body)
            .send(&mut writer)
        {
            Ok(res) => {
                match res.status_code().is_success() {
                    true => Retry::No(
                        serde_json::from_slice::<Vec<Vec<f64>>>(&writer)
                            .or(Err(String::from("Unexpected error"))),
                    ),
                    false => {
                        match res.status_code().into() {
                            409 | 429 | 503 => {
                                // 409 TryAgain 429 RateLimitError
                                // 503 ServiceUnavableila
                                Retry::Yes(String::from_utf8_lossy(&writer).into_owned())
                            }
                            _ => Retry::No(Err(String::from_utf8_lossy(&writer).into_owned())),
                        }
                    }
                }
            }
            Err(e) => Retry::No(Err(e.to_string())),
        }
    }
}