"""OCTAVE grammar compilation orchestration (Phase 2: Generator Engine).

Provides foundation for JIT grammar compilation from META schema definitions.
Coordinates constraint compilation into document-level regex patterns.

Future phases will extend this with full JIT compilation support.
"""

from typing import Any


def compile_document_grammar(meta: dict[str, Any]) -> str:
    """Compile document grammar from META schema definition.

    Takes a META section containing schema information and compiles
    constraint specifications into a unified document grammar.

    This is a stub implementation providing the foundation for Phase 3
    JIT compilation. Currently returns a placeholder regex.

    Args:
        meta: META dictionary from parse_meta_only() or full parse

    Returns:
        Compiled grammar string (regex pattern for document structure)

    Example:
        >>> meta = {"TYPE": "SESSION_LOG", "SCHEMA": "v1.0"}
        >>> grammar = compile_document_grammar(meta)
        >>> isinstance(grammar, str)
        True
    """
    # Phase 2 stub: Foundation for JIT compilation
    # Phase 3 will implement full constraint-to-grammar compilation
    schema_type = meta.get("TYPE", "UNKNOWN")
    return f"# Grammar for {schema_type} (stub - Phase 3 will implement full compilation)"


def emit_grammar_for_schema(schema_name: str) -> str:
    """Emit grammar pattern for named schema.

    Stub for schema-based grammar generation. Phase 3 will integrate
    with schema repository and constraint compilation.

    Args:
        schema_name: Name of schema to compile grammar for

    Returns:
        Grammar pattern string
    """
    return f"# Grammar for schema: {schema_name} (stub)"
