use crate::compression_engine::{get_compression_engine, CompressionType};
use crate::services::error::CoreError;
use std::io::Read;
use std::path::PathBuf;
use std::str::FromStr;
use anyhow::anyhow;

pub struct CompressionService;

impl CompressionService {
    pub fn new() -> Self {
        Self
    }

    pub fn get_item_content(&self, item_path: PathBuf, compression: &str) -> Result<Vec<u8>, CoreError> {
        let compression_type = CompressionType::from_str(compression)
            .map_err(|e| CoreError::Compression(e.to_string()))?;
        let engine = get_compression_engine(compression_type)
            .map_err(|e| CoreError::Other(anyhow!(e.to_string())))?;

        let mut reader = engine.open(item_path.clone())
            .map_err(|e| CoreError::Other(anyhow!("Failed to open item file {:?}: {}", item_path, e)))?;
        let mut content = Vec::new();
        reader.read_to_end(&mut content)?;
        Ok(content)
    }

    pub fn stream_item_content(
        &self,
        item_path: PathBuf,
        compression: &str,
    ) -> Result<Box<dyn Read + Send>, CoreError> {
        let compression_type = CompressionType::from_str(compression)
            .map_err(|e| CoreError::Compression(e.to_string()))?;
        let engine = get_compression_engine(compression_type)
            .map_err(|e| CoreError::Other(anyhow!(e.to_string())))?;

        let reader = engine.open(item_path.clone())
            .map_err(|e| CoreError::Other(anyhow!("Failed to open item file {:?}: {}", item_path, e)))?;
        // Since we can't guarantee the reader implements Send, we need to wrap it
        // We'll read the content into a buffer and return a Cursor which is Send
        // This is not ideal for large files, but it ensures Send is implemented
        let mut content = Vec::new();
        let mut temp_reader = reader;
        temp_reader.read_to_end(&mut content)?;
        Ok(Box::new(std::io::Cursor::new(content)))
    }
}

impl Default for CompressionService {
    fn default() -> Self {
        Self::new()
    }
}