use crate::{error::MullamaError, sys};

/// Vocabulary management for tokenization and detokenization
///
/// This module handles:
/// - Token to text conversion
/// - Text to token conversion
/// - Special token identification
/// - Vocabulary metadata
pub struct Vocabulary {
    // In a real implementation, this would contain:
    // - Reference to the C++ vocabulary object
    // - Token mapping tables
    // - Special token IDs
    pub _placeholder: usize,
}

impl Vocabulary {
    /// Create a new vocabulary manager
    pub fn new() -> Self {
        Self { _placeholder: 0 }
    }

    /// Convert text to tokens
    pub fn tokenize(
        &self,
        _text: &str,
        _add_special: bool,
        _parse_special: bool,
    ) -> Result<Vec<sys::llama_token>, MullamaError> {
        // In a real implementation, this would:
        // - Call the C++ tokenization functions
        // - Handle special tokens
        // - Return token IDs
        Ok(vec![1, 2, 3]) // Placeholder
    }

    /// Convert tokens to text
    pub fn detokenize(
        &self,
        _tokens: &[sys::llama_token],
        _remove_special: bool,
        _unparse_special: bool,
    ) -> Result<String, MullamaError> {
        // In a real implementation, this would:
        // - Call the C++ detokenization functions
        // - Handle special tokens
        // - Return reconstructed text
        Ok("detokenized text".to_string()) // Placeholder
    }

    /// Convert a single token to its text representation
    pub fn token_to_piece(
        &self,
        _token: sys::llama_token,
        _special: bool,
    ) -> Result<String, MullamaError> {
        // In a real implementation, this would:
        // - Get the text representation of a token
        // - Handle special token formatting
        Ok("token".to_string()) // Placeholder
    }

    /// Get the text representation of a token
    pub fn get_token_text(&self, _token: sys::llama_token) -> Result<String, MullamaError> {
        // In a real implementation, this would return the token text
        Ok("token_text".to_string()) // Placeholder
    }

    /// Get the score of a token
    pub fn get_token_score(&self, _token: sys::llama_token) -> Result<f32, MullamaError> {
        // In a real implementation, this would return the token score
        Ok(0.0) // Placeholder
    }

    /// Check if a token is an end-of-generation token
    pub fn is_end_of_generation(&self, _token: sys::llama_token) -> bool {
        // In a real implementation, this would check if the token
        // is an end-of-generation token
        false // Placeholder
    }

    /// Check if a token is a control token
    pub fn is_control_token(&self, _token: sys::llama_token) -> bool {
        // In a real implementation, this would check if the token
        // is a control token
        false // Placeholder
    }

    /// Get the beginning-of-sentence token
    pub fn get_bos_token(&self) -> Result<sys::llama_token, MullamaError> {
        Ok(1) // Placeholder
    }

    /// Get the end-of-sentence token
    pub fn get_eos_token(&self) -> Result<sys::llama_token, MullamaError> {
        Ok(2) // Placeholder
    }

    /// Get the end-of-turn token
    pub fn get_eot_token(&self) -> Result<sys::llama_token, MullamaError> {
        Ok(3) // Placeholder
    }

    /// Get the padding token
    pub fn get_pad_token(&self) -> Result<sys::llama_token, MullamaError> {
        Ok(0) // Placeholder
    }

    /// Check if BOS token should be added
    pub fn should_add_bos(&self) -> bool {
        true // Placeholder
    }

    /// Check if EOS token should be added
    pub fn should_add_eos(&self) -> bool {
        true // Placeholder
    }
}

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