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"""Library functions and utility methods used across user-facing IDL scripts."""

import os

from typing import Set, List

from buildscripts.idl.idl import syntax, parser
from buildscripts.idl.idl.compiler import CompilerImportResolver

# List of feature flags that are disabled by default. The file name is repeated in
# evergreen.yml
ALL_FEATURE_FLAG_FILE = "all_feature_flags.txt"


def list_idls(directory: str) -> Set[str]:
    """Find all IDL files in the current directory."""
    return {
        os.path.join(dirpath, filename)
        for dirpath, dirnames, filenames in os.walk(directory) for filename in filenames
        if filename.endswith('.idl')
    }


def parse_idl(idl_path: str, import_directories: List[str]) -> syntax.IDLParsedSpec:
    """Parse an IDL file or throw an error."""
    parsed_doc = parser.parse(open(idl_path), idl_path, CompilerImportResolver(import_directories))

    if parsed_doc.errors:
        parsed_doc.errors.dump_errors()
        raise ValueError(f"Cannot parse {idl_path}")

    return parsed_doc