"""
Tree Sitter Tree and Node implementation for Python.
"""

from typing import Optional, List, Iterator, Tuple
from .language import Language
from .types import Point, Range
from .exceptions import TreeSitterException


class Node:
    """
    Represents a node in a syntax tree.
    """
    
    def __init__(self, node_ptr, source_code: str, language: Language):
        """
        Initialize a node.
        
        Args:
            node_ptr: Pointer to the tree-sitter node
            source_code: The source code this node represents
            language: The language this node belongs to
        """
        self._node_ptr = node_ptr
        self._source_code = source_code
        self._language = language
    
    @property
    def type(self) -> str:
        """Get the node type."""
        # Implementation would call ts_node_type(self._node_ptr)
        return "unknown"
    
    @property
    def symbol(self) -> int:
        """Get the node's symbol ID."""
        # Implementation would call ts_node_symbol(self._node_ptr)
        return 0
    
    @property
    def grammar_type(self) -> str:
        """Get the node's grammar type (ignoring aliases)."""
        # Implementation would call ts_node_grammar_type(self._node_ptr)
        return "unknown"
    
    @property
    def grammar_symbol(self) -> int:
        """Get the node's grammar symbol ID (ignoring aliases)."""
        # Implementation would call ts_node_grammar_symbol(self._node_ptr)
        return 0
    
    @property
    def start_byte(self) -> int:
        """Get the start byte position."""
        # Implementation would call ts_node_start_byte(self._node_ptr)
        return 0
    
    @property
    def end_byte(self) -> int:
        """Get the end byte position."""
        # Implementation would call ts_node_end_byte(self._node_ptr)
        return 0
    
    @property
    def start_point(self) -> Point:
        """Get the start point (row, column)."""
        # Implementation would call ts_node_start_point(self._node_ptr)
        return Point(0, 0)
    
    @property
    def end_point(self) -> Point:
        """Get the end point (row, column)."""
        # Implementation would call ts_node_end_point(self._node_ptr)
        return Point(0, 0)
    
    @property
    def text(self) -> str:
        """Get the text content of this node."""
        return self._source_code[self.start_byte:self.end_byte]
    
    def is_null(self) -> bool:
        """Check if the node is null."""
        # Implementation would call ts_node_is_null(self._node_ptr)
        return False
    
    def is_named(self) -> bool:
        """Check if the node is named."""
        # Implementation would call ts_node_is_named(self._node_ptr)
        return True
    
    def is_missing(self) -> bool:
        """Check if the node is missing."""
        # Implementation would call ts_node_is_missing(self._node_ptr)
        return False
    
    def is_extra(self) -> bool:
        """Check if the node is extra."""
        # Implementation would call ts_node_is_extra(self._node_ptr)
        return False
    
    def has_changes(self) -> bool:
        """Check if the node has changes."""
        # Implementation would call ts_node_has_changes(self._node_ptr)
        return False
    
    def has_error(self) -> bool:
        """Check if the node has errors."""
        # Implementation would call ts_node_has_error(self._node_ptr)
        return False
    
    def is_error(self) -> bool:
        """Check if the node is an error."""
        # Implementation would call ts_node_is_error(self._node_ptr)
        return False
    
    def parse_state(self) -> int:
        """Get the node's parse state."""
        # Implementation would call ts_node_parse_state(self._node_ptr)
        return 0
    
    def next_parse_state(self) -> int:
        """Get the parse state after this node."""
        # Implementation would call ts_node_next_parse_state(self._node_ptr)
        return 0
    
    def parent(self) -> Optional['Node']:
        """Get the node's parent."""
        # Implementation would call ts_node_parent(self._node_ptr)
        return None
    
    def child(self, index: int) -> Optional['Node']:
        """
        Get a child node by index.
        
        Args:
            index: The child index
            
        Returns:
            The child node, or None if not found
        """
        # Implementation would call ts_node_child(self._node_ptr, index)
        return None
    
    def child_count(self) -> int:
        """Get the number of child nodes."""
        # Implementation would call ts_node_child_count(self._node_ptr)
        return 0
    
    def named_child(self, index: int) -> Optional['Node']:
        """
        Get a named child node by index.
        
        Args:
            index: The named child index
            
        Returns:
            The named child node, or None if not found
        """
        # Implementation would call ts_node_named_child(self._node_ptr, index)
        return None
    
    def named_child_count(self) -> int:
        """Get the number of named child nodes."""
        # Implementation would call ts_node_named_child_count(self._node_ptr)
        return 0
    
    def child_by_field_name(self, field_name: str) -> Optional['Node']:
        """
        Get a child node by field name.
        
        Args:
            field_name: The field name
            
        Returns:
            The child node, or None if not found
        """
        # Implementation would call ts_node_child_by_field_name(self._node_ptr, field_name, len(field_name))
        return None
    
    def child_by_field_id(self, field_id: int) -> Optional['Node']:
        """
        Get a child node by field ID.
        
        Args:
            field_id: The field ID
            
        Returns:
            The child node, or None if not found
        """
        # Implementation would call ts_node_child_by_field_id(self._node_ptr, field_id)
        return None
    
    def field_name_for_child(self, child_index: int) -> Optional[str]:
        """
        Get the field name for a child at the given index.
        
        Args:
            child_index: The child index
            
        Returns:
            The field name, or None if not found
        """
        # Implementation would call ts_node_field_name_for_child(self._node_ptr, child_index)
        return None
    
    def next_sibling(self) -> Optional['Node']:
        """Get the next sibling node."""
        # Implementation would call ts_node_next_sibling(self._node_ptr)
        return None
    
    def prev_sibling(self) -> Optional['Node']:
        """Get the previous sibling node."""
        # Implementation would call ts_node_prev_sibling(self._node_ptr)
        return None
    
    def next_named_sibling(self) -> Optional['Node']:
        """Get the next named sibling node."""
        # Implementation would call ts_node_next_named_sibling(self._node_ptr)
        return None
    
    def prev_named_sibling(self) -> Optional['Node']:
        """Get the previous named sibling node."""
        # Implementation would call ts_node_prev_named_sibling(self._node_ptr)
        return None
    
    def first_child_for_byte(self, byte: int) -> Optional['Node']:
        """
        Get the first child that extends beyond the given byte offset.
        
        Args:
            byte: Byte offset
            
        Returns:
            The first child node, or None if not found
        """
        # Implementation would call ts_node_first_child_for_byte(self._node_ptr, byte)
        return None
    
    def first_named_child_for_byte(self, byte: int) -> Optional['Node']:
        """
        Get the first named child that extends beyond the given byte offset.
        
        Args:
            byte: Byte offset
            
        Returns:
            The first named child node, or None if not found
        """
        # Implementation would call ts_node_first_named_child_for_byte(self._node_ptr, byte)
        return None
    
    def descendant_count(self) -> int:
        """Get the number of descendants, including the node itself."""
        # Implementation would call ts_node_descendant_count(self._node_ptr)
        return 1
    
    def descendant_for_byte_range(self, start_byte: int, end_byte: int) -> Optional['Node']:
        """
        Get the smallest node that spans the given byte range.
        
        Args:
            start_byte: Start byte position
            end_byte: End byte position
            
        Returns:
            The descendant node, or None if not found
        """
        # Implementation would call ts_node_descendant_for_byte_range(self._node_ptr, start_byte, end_byte)
        return None
    
    def descendant_for_point_range(self, start_point: Point, end_point: Point) -> Optional['Node']:
        """
        Get the smallest node that spans the given point range.
        
        Args:
            start_point: Start point
            end_point: End point
            
        Returns:
            The descendant node, or None if not found
        """
        # Implementation would call ts_node_descendant_for_point_range(self._node_ptr, start_point, end_point)
        return None
    
    def named_descendant_for_byte_range(self, start_byte: int, end_byte: int) -> Optional['Node']:
        """
        Get the smallest named node that spans the given byte range.
        
        Args:
            start_byte: Start byte position
            end_byte: End byte position
            
        Returns:
            The named descendant node, or None if not found
        """
        # Implementation would call ts_node_named_descendant_for_byte_range(self._node_ptr, start_byte, end_byte)
        return None
    
    def named_descendant_for_point_range(self, start_point: Point, end_point: Point) -> Optional['Node']:
        """
        Get the smallest named node that spans the given point range.
        
        Args:
            start_point: Start point
            end_point: End point
            
        Returns:
            The named descendant node, or None if not found
        """
        # Implementation would call ts_node_named_descendant_for_point_range(self._node_ptr, start_point, end_point)
        return None
    
    def edit(self, edit: 'InputEdit') -> None:
        """
        Edit the node to keep it in-sync with source code changes.
        
        Args:
            edit: The edit to apply
        """
        # Implementation would call ts_node_edit(self._node_ptr, edit)
        pass
    
    def equals(self, other: 'Node') -> bool:
        """
        Check if two nodes are identical.
        
        Args:
            other: The other node to compare
            
        Returns:
            True if the nodes are identical, False otherwise
        """
        # Implementation would call ts_node_eq(self._node_ptr, other._node_ptr)
        return self._node_ptr == other._node_ptr
    
    def to_string(self) -> str:
        """Get an S-expression representation of the node."""
        # Implementation would call ts_node_string(self._node_ptr)
        return f"({self.type})"
    
    def children(self) -> Iterator['Node']:
        """Iterate over all child nodes."""
        for i in range(self.child_count()):
            child = self.child(i)
            if child is not None:
                yield child
    
    def named_children(self) -> Iterator['Node']:
        """Iterate over all named child nodes."""
        for i in range(self.named_child_count()):
            child = self.named_child(i)
            if child is not None:
                yield child
    
    def walk(self) -> 'TreeCursor':
        """Create a cursor for walking this node."""
        return TreeCursor(self)
    
    def __eq__(self, other) -> bool:
        """Check if two nodes are equal."""
        if not isinstance(other, Node):
            return False
        return self.equals(other)
    
    def __str__(self) -> str:
        """String representation of the node."""
        return self.to_string()


class TreeCursor:
    """
    A cursor for walking through a syntax tree.
    """
    
    def __init__(self, node: Node):
        """
        Initialize a tree cursor.
        
        Args:
            node: The node to start from
        """
        self._cursor_ptr = None  # Would be ts_tree_cursor_new(node._node_ptr)
        self._current_node = node
        self._path: List[int] = []
    
    @property
    def current_node(self) -> Node:
        """Get the current node."""
        # Implementation would call ts_tree_cursor_current_node(self._cursor_ptr)
        return self._current_node
    
    @property
    def current_field_name(self) -> Optional[str]:
        """Get the field name of the current node."""
        # Implementation would call ts_tree_cursor_current_field_name(self._cursor_ptr)
        return None
    
    @property
    def current_field_id(self) -> int:
        """Get the field ID of the current node."""
        # Implementation would call ts_tree_cursor_current_field_id(self._cursor_ptr)
        return 0
    
    @property
    def current_depth(self) -> int:
        """Get the depth of the current node."""
        # Implementation would call ts_tree_cursor_current_depth(self._cursor_ptr)
        return len(self._path)
    
    @property
    def current_descendant_index(self) -> int:
        """Get the descendant index of the current node."""
        # Implementation would call ts_tree_cursor_current_descendant_index(self._cursor_ptr)
        return 0
    
    def reset(self, node: Node) -> None:
        """
        Reset the cursor to start at a different node.
        
        Args:
            node: The node to start from
        """
        # Implementation would call ts_tree_cursor_reset(self._cursor_ptr, node._node_ptr)
        self._current_node = node
        self._path = []
    
    def reset_to(self, other_cursor: 'TreeCursor') -> None:
        """
        Reset the cursor to the same position as another cursor.
        
        Args:
            other_cursor: The cursor to copy position from
        """
        # Implementation would call ts_tree_cursor_reset_to(self._cursor_ptr, other_cursor._cursor_ptr)
        self._current_node = other_cursor._current_node
        self._path = other_cursor._path.copy()
    
    def goto_parent(self) -> bool:
        """Move to the parent of the current node."""
        # Implementation would call ts_tree_cursor_goto_parent(self._cursor_ptr)
        if not self._path:
            return False
        
        self._path.pop()
        # Would update _current_node based on cursor state
        return True
    
    def goto_next_sibling(self) -> bool:
        """Move to the next sibling of the current node."""
        # Implementation would call ts_tree_cursor_goto_next_sibling(self._cursor_ptr)
        if not self._path:
            return False
        
        current_index = self._path[-1]
        # Would check if next sibling exists and update cursor
        return False
    
    def goto_prev_sibling(self) -> bool:
        """Move to the previous sibling of the current node."""
        # Implementation would call ts_tree_cursor_goto_previous_sibling(self._cursor_ptr)
        if not self._path:
            return False
        
        current_index = self._path[-1]
        if current_index > 0:
            self._path[-1] = current_index - 1
            return True
        return False
    
    def goto_first_child(self) -> bool:
        """Move to the first child of the current node."""
        # Implementation would call ts_tree_cursor_goto_first_child(self._cursor_ptr)
        if self._current_node.child_count() > 0:
            self._current_node = self._current_node.child(0)
            self._path.append(0)
            return True
        return False
    
    def goto_last_child(self) -> bool:
        """Move to the last child of the current node."""
        # Implementation would call ts_tree_cursor_goto_last_child(self._cursor_ptr)
        child_count = self._current_node.child_count()
        if child_count > 0:
            self._current_node = self._current_node.child(child_count - 1)
            self._path.append(child_count - 1)
            return True
        return False
    
    def goto_descendant(self, goal_descendant_index: int) -> None:
        """
        Move to the node that is the nth descendant of the original node.
        
        Args:
            goal_descendant_index: The descendant index to move to
        """
        # Implementation would call ts_tree_cursor_goto_descendant(self._cursor_ptr, goal_descendant_index)
        pass
    
    def goto_first_child_for_byte(self, goal_byte: int) -> int:
        """
        Move to the first child that extends beyond the given byte offset.
        
        Args:
            goal_byte: The byte offset to search for
            
        Returns:
            The index of the child if found, -1 otherwise
        """
        # Implementation would call ts_tree_cursor_goto_first_child_for_byte(self._cursor_ptr, goal_byte)
        return -1
    
    def goto_first_child_for_point(self, goal_point: Point) -> int:
        """
        Move to the first child that extends beyond the given point.
        
        Args:
            goal_point: The point to search for
            
        Returns:
            The index of the child if found, -1 otherwise
        """
        # Implementation would call ts_tree_cursor_goto_first_child_for_point(self._cursor_ptr, goal_point)
        return -1
    
    def copy(self) -> 'TreeCursor':
        """Create a copy of this cursor."""
        # Implementation would call ts_tree_cursor_copy(self._cursor_ptr)
        new_cursor = TreeCursor(self._current_node)
        new_cursor._path = self._path.copy()
        return new_cursor
    
    def __del__(self):
        """Clean up cursor resources."""
        if self._cursor_ptr is not None:
            # Implementation would call ts_tree_cursor_delete(self._cursor_ptr)
            pass


class Tree:
    """
    Represents a syntax tree.
    """
    
    def __init__(self, tree_ptr, source_code: str, language: Language):
        """
        Initialize a tree.
        
        Args:
            tree_ptr: Pointer to the tree-sitter tree
            source_code: The source code this tree represents
            language: The language this tree was parsed with
        """
        self._tree_ptr = tree_ptr
        self._source_code = source_code
        self._language = language
        self._root_node = None
    
    @property
    def root_node(self) -> Node:
        """Get the root node of the tree."""
        if self._root_node is None:
            # Implementation would call ts_tree_root_node(self._tree_ptr)
            self._root_node = Node(None, self._source_code, self._language)
        return self._root_node
    
    def root_node_with_offset(self, offset_bytes: int, offset_extent: Point) -> Node:
        """
        Get the root node with its position shifted forward by the given offset.
        
        Args:
            offset_bytes: Byte offset
            offset_extent: Point offset
            
        Returns:
            The root node with offset
        """
        # Implementation would call ts_tree_root_node_with_offset(self._tree_ptr, offset_bytes, offset_extent)
        return self.root_node
    
    def language(self) -> Language:
        """Get the language that was used to parse this tree."""
        # Implementation would call ts_tree_language(self._tree_ptr)
        return self._language
    
    def included_ranges(self) -> List[Range]:
        """
        Get the array of included ranges that was used to parse this tree.
        
        Returns:
            List of included ranges
        """
        # Implementation would call ts_tree_included_ranges(self._tree_ptr, length)
        return []
    
    def edit(self, edit: 'InputEdit') -> None:
        """
        Edit the tree to keep it in sync with source code that has been edited.
        
        Args:
            edit: The edit to apply
        """
        # Implementation would call ts_tree_edit(self._tree_ptr, edit)
        pass
    
    def get_changed_ranges(self, old_tree: 'Tree') -> List[Range]:
        """
        Compare this tree to an old edited tree and return ranges that changed.
        
        Args:
            old_tree: The old tree to compare against
            
        Returns:
            List of changed ranges
        """
        # Implementation would call ts_tree_get_changed_ranges(old_tree._tree_ptr, self._tree_ptr, length)
        return []
    
    def print_dot_graph(self, file_descriptor: int) -> None:
        """
        Write a DOT graph describing the syntax tree to the given file.
        
        Args:
            file_descriptor: File descriptor to write to
        """
        # Implementation would call ts_tree_print_dot_graph(self._tree_ptr, file_descriptor)
        pass
    
    def copy(self) -> 'Tree':
        """Create a shallow copy of the syntax tree."""
        # Implementation would call ts_tree_copy(self._tree_ptr)
        return Tree(self._tree_ptr, self._source_code, self._language)
    
    def __del__(self):
        """Clean up tree resources."""
        if self._tree_ptr is not None:
            # Implementation would call ts_tree_delete(self._tree_ptr)
            pass


class InputEdit:
    """Represents an edit to source code."""
    
    def __init__(self, 
                 start_byte: int, 
                 old_end_byte: int, 
                 new_end_byte: int,
                 start_point: Point, 
                 old_end_point: Point, 
                 new_end_point: Point):
        """
        Initialize an input edit.
        
        Args:
            start_byte: Start byte position
            old_end_byte: Old end byte position
            new_end_byte: New end byte position
            start_point: Start point
            old_end_point: Old end point
            new_end_point: New end point
        """
        self.start_byte = start_byte
        self.old_end_byte = old_end_byte
        self.new_end_byte = new_end_byte
        self.start_point = start_point
        self.old_end_point = old_end_point
        self.new_end_point = new_end_point
