"""
Tree Sitter Language implementation for Python.
"""

import ctypes
from typing import Optional
from .types import SymbolType
from .exceptions import TreeSitterLanguageError


class Language:
    """
    Represents a tree-sitter language grammar.
    """
    
    def __init__(self, language_ptr: Optional[ctypes.c_void_p] = None):
        """
        Initialize a language.
        
        Args:
            language_ptr: Optional pointer to a tree-sitter language
        """
        self._language_ptr = language_ptr
        self._version = None
        self._field_count = None
        self._symbol_count = None
        self._state_count = None
    
    @property
    def version(self) -> int:
        """Get the language version."""
        if self._version is None:
            # Implementation would call ts_language_version(self._language_ptr)
            self._version = 1
        return self._version
    
    @property
    def field_count(self) -> int:
        """Get the number of fields in this language."""
        if self._field_count is None:
            # Implementation would call ts_language_field_count(self._language_ptr)
            self._field_count = 0
        return self._field_count
    
    @property
    def symbol_count(self) -> int:
        """Get the number of symbols in this language."""
        if self._symbol_count is None:
            # Implementation would call ts_language_symbol_count(self._language_ptr)
            self._symbol_count = 0
        return self._symbol_count
    
    @property
    def state_count(self) -> int:
        """Get the number of valid states in this language."""
        if self._state_count is None:
            # Implementation would call ts_language_state_count(self._language_ptr)
            self._state_count = 0
        return self._state_count
    
    def field_name_for_id(self, field_id: int) -> Optional[str]:
        """
        Get the field name for a given field ID.
        
        Args:
            field_id: The field ID
            
        Returns:
            The field name, or None if not found
        """
        # Implementation would call ts_language_field_name_for_id(self._language_ptr, field_id)
        return None
    
    def field_id_for_name(self, field_name: str) -> Optional[int]:
        """
        Get the field ID for a given field name.
        
        Args:
            field_name: The field name
            
        Returns:
            The field ID, or None if not found
        """
        # Implementation would call ts_language_field_id_for_name(self._language_ptr, field_name, len(field_name))
        return None
    
    def symbol_name(self, symbol_id: int) -> Optional[str]:
        """
        Get the symbol name for a given symbol ID.
        
        Args:
            symbol_id: The symbol ID
            
        Returns:
            The symbol name, or None if not found
        """
        # Implementation would call ts_language_symbol_name(self._language_ptr, symbol_id)
        return None
    
    def symbol_for_name(self, symbol_name: str, is_named: bool = True) -> Optional[int]:
        """
        Get the symbol ID for a given symbol name.
        
        Args:
            symbol_name: The symbol name
            is_named: Whether to look for named symbols only
            
        Returns:
            The symbol ID, or None if not found
        """
        # Implementation would call ts_language_symbol_for_name(self._language_ptr, symbol_name, len(symbol_name), is_named)
        return None
    
    def symbol_type(self, symbol_id: int) -> SymbolType:
        """
        Get the symbol type for a given symbol ID.
        
        Args:
            symbol_id: The symbol ID
            
        Returns:
            The symbol type
        """
        # Implementation would call ts_language_symbol_type(self._language_ptr, symbol_id)
        return SymbolType.REGULAR
    
    def next_state(self, state_id: int, symbol_id: int) -> int:
        """
        Get the next parse state for a given state and symbol.
        
        Args:
            state_id: Current state ID
            symbol_id: Symbol ID
            
        Returns:
            Next state ID
        """
        # Implementation would call ts_language_next_state(self._language_ptr, state_id, symbol_id)
        return 0
    
    def is_wasm(self) -> bool:
        """
        Check if the language came from a WebAssembly module.
        
        Returns:
            True if the language is from WASM, False otherwise
        """
        # Implementation would call ts_language_is_wasm(self._language_ptr)
        return False
    
    def copy(self) -> 'Language':
        """
        Create a copy of this language.
        
        Returns:
            A new language instance
        """
        # Implementation would call ts_language_copy(self._language_ptr)
        return Language(self._language_ptr)
    
    def __del__(self):
        """Clean up language resources."""
        if self._language_ptr is not None:
            # Implementation would call ts_language_delete(self._language_ptr)
            pass
    
    @classmethod
    def from_library(cls, library_path: str, language_name: str) -> 'Language':
        """
        Load a language from a shared library.
        
        Args:
            library_path: Path to the language library
            language_name: Name of the language function to call
            
        Returns:
            A new language instance
            
        Raises:
            TreeSitterLanguageError: If loading fails
        """
        try:
            # Load the library
            lib = ctypes.CDLL(library_path)
            
            # Get the language function
            get_language_func = getattr(lib, language_name)
            get_language_func.restype = ctypes.c_void_p
            
            # Call the function to get the language
            language_ptr = get_language_func()
            
            if language_ptr is None:
                raise TreeSitterLanguageError(f"Failed to load language from {library_path}")
            
            return cls(language_ptr)
            
        except Exception as e:
            raise TreeSitterLanguageError(f"Failed to load language: {e}")
    
    @classmethod
    def from_wasm(cls, wasm_store, name: str, wasm_data: bytes) -> 'Language':
        """
        Load a language from WebAssembly data.
        
        Args:
            wasm_store: WebAssembly store
            name: Language name
            wasm_data: WebAssembly bytecode
            
        Returns:
            A new language instance
        """
        # Implementation would use ts_wasm_store_load_language
        raise NotImplementedError("WebAssembly support not yet implemented")
