"""Response formatting helpers."""

import json
from typing import Any, Dict, List


def build_context_block(results: List[Dict]) -> str:
    context_parts = []
    for i, r in enumerate(results, 1):
        context_parts.append(
            f"[Source {i}: {r.get('document_name', 'Unknown')}, "
            f"Page {r.get('page_number', '?')}, "
            f"Section: {r.get('section', 'general')}]\n{r.get('text', '')}"
        )
    return "\n\n---\n\n".join(context_parts)


def format_sse_event(event_type: str, data: Any) -> str:
    payload = {"type": event_type, "data": data}
    return f"data: {json.dumps(payload)}\n\n"


def format_citation(source: Dict) -> str:
    return (
        f"{source.get('document_name', 'Unknown')} "
        f"(p.{source.get('page_number', '?')}, {source.get('section', 'general')})"
    )