from __future__ import annotations

from typing import Any
from ..states.ingestion_state import IngestionState


def validation_node(state: IngestionState, allowed_sources: set[str] | None = None) -> dict[str, Any]:
    """Validation Phase: Validate request input and fail fast on malformed requests."""
    request = state.get("request")
    allowed = allowed_sources or {"github", "sharepoint"}
    errors: list[str] = []

    if not request:
        errors.append("missing ingestion request")
    else:
        if not request.source or not request.source.strip():
            errors.append("missing request source")
        elif request.source not in allowed:
            errors.append(f"unsupported source '{request.source}'")

        if not request.locator or not request.locator.strip():
            errors.append("missing request locator")

    if errors:
        error_records = list(state.get("errors", []))
        for err in errors:
            error_records.append({"step": "validation", "message": err, "recoverable": False})

        return {
            "validation_errors": errors,
            "errors": error_records,
            "has_errors": True,
            "current_step": "validation",
            "next_step": "END",
        }

    return {
        "validation_errors": [],
        "current_step": "validation",
        "next_step": "generation",
    }