//! Sequence-to-sequence models for translation

use crate::Result;
use rtx_tensor::Tensor;

/// Sequence-to-sequence encoder-decoder model
pub struct Seq2SeqModel {
    encoder: Encoder,
    decoder: Decoder,
}

pub struct Encoder {
    // Model parameters would go here
}

pub struct Decoder {
    // Model parameters would go here
}

impl Default for Seq2SeqModel {
    fn default() -> Self {
        Self::new()
    }
}

impl Seq2SeqModel {
    pub fn new() -> Self {
        Self {
            encoder: Encoder {},
            decoder: Decoder {},
        }
    }

    pub fn forward(&self, input_ids: &Tensor, target_ids: &Tensor) -> Result<Tensor> {
        let encoder_output = self.encoder.forward(input_ids)?;
        let decoder_output = self.decoder.forward(target_ids, &encoder_output)?;
        Ok(decoder_output)
    }
}

impl Encoder {
    pub fn forward(&self, input_ids: &Tensor) -> Result<Tensor> {
        // Mock implementation
        Ok(input_ids.clone())
    }
}

impl Decoder {
    pub fn forward(&self, target_ids: &Tensor, _encoder_output: &Tensor) -> Result<Tensor> {
        // Mock implementation
        Ok(target_ids.clone())
    }
}