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#ifndef TREE_SITTER_TREE_CURSOR_H_
#define TREE_SITTER_TREE_CURSOR_H_

#include "./subtree.h"

typedef struct {
  const Subtree *subtree;
  Length position;
  uint32_t child_index;
  uint32_t structural_child_index;
  uint32_t descendant_index;
} TreeCursorEntry;

typedef struct {
  const TSTree *tree;
  Array(TreeCursorEntry) stack;
  TSSymbol root_alias_symbol;
} TreeCursor;

typedef enum {
  TreeCursorStepNone,
  TreeCursorStepHidden,
  TreeCursorStepVisible,
} TreeCursorStep;

void ts_tree_cursor_init(TreeCursor *, TSNode);
void ts_tree_cursor_current_status(
  const TSTreeCursor *,
  TSFieldId *,
  bool *,
  bool *,
  bool *,
  TSSymbol *,
  unsigned *
);

TreeCursorStep ts_tree_cursor_goto_first_child_internal(TSTreeCursor *);
TreeCursorStep ts_tree_cursor_goto_next_sibling_internal(TSTreeCursor *);

static inline Subtree ts_tree_cursor_current_subtree(const TSTreeCursor *_self) {
  const TreeCursor *self = (const TreeCursor *)_self;
  TreeCursorEntry *last_entry = array_back(&self->stack);
  return *last_entry->subtree;
}

TSNode ts_tree_cursor_parent_node(const TSTreeCursor *);

#endif  // TREE_SITTER_TREE_CURSOR_H_