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use std::path::Path;

use reqwest::Body;
use tokio::fs::File;
use tokio_util::codec::{BytesCodec, FramedRead};

use crate::error::OpenAIError;
use crate::types::InputSource;

pub(crate) async fn file_stream_body(source: InputSource) -> Result<Body, OpenAIError> {
    let body = match source {
        InputSource::Path{ path } => {
            let file = File::open(path)
                .await
                .map_err(|e| OpenAIError::FileReadError(e.to_string()))?;
            let stream = FramedRead::new(file, BytesCodec::new());
            Body::wrap_stream(stream)
        }
        _ => return Err(OpenAIError::FileReadError("Cannot create stream from non-file source".to_string())),
    };
    Ok(body)
}

/// Creates the part for the given file for multipart upload.
pub(crate) async fn create_file_part(
    source: InputSource,
) -> Result<reqwest::multipart::Part, OpenAIError> {
    let (stream, file_name) = match source {
        InputSource::Path{ path } => {
            let file_name = path.file_name()
                .ok_or_else(|| OpenAIError::FileReadError(format!("cannot extract file name from {}", path.display())))?
                .to_str()
                .unwrap()
                .to_string();

            (file_stream_body(InputSource::Path{ path }).await?, file_name)
        }
        InputSource::Bytes{ filename, bytes } => {
            (Body::from(bytes), filename)
        }
        InputSource::VecU8{ filename, vec } => {
            (Body::from(vec), filename)
        }
    };

    let file_part = reqwest::multipart::Part::stream(stream)
        .file_name(file_name)
        .mime_str("application/octet-stream")
        .unwrap();

    Ok(file_part)
}

pub(crate) fn create_all_dir<P: AsRef<Path>>(dir: P) -> Result<(), OpenAIError> {
    let exists = match Path::try_exists(dir.as_ref()) {
        Ok(exists) => exists,
        Err(e) => return Err(OpenAIError::FileSaveError(e.to_string())),
    };

    if !exists {
        std::fs::create_dir_all(dir.as_ref())
            .map_err(|e| OpenAIError::FileSaveError(e.to_string()))?;
    }

    Ok(())
}