from dataclasses import dataclass

from kab_ingestion.models import SourceDocument


@dataclass(frozen=True)
class ValidationReport:
    valid: bool
    errors: tuple[str, ...]


def validate_document(document: SourceDocument) -> ValidationReport:
    errors: list[str] = []
    if not document.identifier.strip():
        errors.append("identifier is required")
    if not document.title.strip():
        errors.append("title is required")
    if not document.body.strip():
        errors.append("body is required")
    if not document.source.strip():
        errors.append("source is required")
    return ValidationReport(not errors, tuple(errors))