oris-runtime 0.15.0

use std::{
    collections::HashMap,
    fs::File,
    io::{BufReader, Cursor, Read},
    path::Path,
    pin::Pin,
};

use async_trait::async_trait;
use futures::{stream, Stream};

use crate::{
    document_loaders::{process_doc_stream, Loader, LoaderError},
    schemas::Document,
    text_splitter::TextSplitter,
};

/// Markdown loader that loads Markdown files
#[derive(Debug, Clone)]
pub struct MarkdownLoader<R> {
    reader: R,
}

impl<R: Read> MarkdownLoader<R> {
    pub fn new(reader: R) -> Self {
        Self { reader }
    }
}

impl MarkdownLoader<Cursor<Vec<u8>>> {
    pub fn from_string<S: Into<String>>(input: S) -> Self {
        let input = input.into();
        let reader = Cursor::new(input.into_bytes());
        Self::new(reader)
    }
}

impl MarkdownLoader<BufReader<File>> {
    pub fn from_path<P: AsRef<Path>>(path: P) -> Result<Self, LoaderError> {
        let file = File::open(path)?;
        let reader = BufReader::new(file);
        Ok(Self::new(reader))
    }
}

#[async_trait]
impl<R: Read + Send + Sync + 'static> Loader for MarkdownLoader<R> {
    async fn load(
        mut self,
    ) -> Result<
        Pin<Box<dyn Stream<Item = Result<Document, LoaderError>> + Send + 'static>>,
        LoaderError,
    > {
        let mut content = String::new();
        self.reader.read_to_string(&mut content)?;

        let mut metadata = HashMap::new();
        metadata.insert(
            "source_type".to_string(),
            serde_json::Value::from("markdown"),
        );

        let doc = Document::new(content).with_metadata(metadata);
        let stream = stream::iter(vec![Ok(doc)]);
        Ok(Box::pin(stream))
    }

    async fn load_and_split<TS: TextSplitter + 'static>(
        mut self,
        splitter: TS,
    ) -> Result<
        Pin<Box<dyn Stream<Item = Result<Document, LoaderError>> + Send + 'static>>,
        LoaderError,
    > {
        let doc_stream = self.load().await?;
        let stream = process_doc_stream(doc_stream, splitter).await;
        Ok(Box::pin(stream))
    }
}

#[cfg(test)]
mod tests {
    use futures_util::StreamExt;

    use super::*;

    #[tokio::test]
    async fn test_markdown_loader() {
        let input = "# Title\n\nThis is a paragraph with **bold** text.";
        let loader = MarkdownLoader::from_string(input);

        let documents = loader
            .load()
            .await
            .unwrap()
            .map(|x| x.unwrap())
            .collect::<Vec<_>>()
            .await;

        assert_eq!(documents.len(), 1);
        assert!(documents[0].page_content.contains("Title"));
        assert!(documents[0].page_content.contains("bold"));
    }
}