from collections import deque
from typing import Any

from app.domain.schemas import TranscriptChunk


class ContextBuilder:
    """Maintains a Redis-compatible meeting context; uses memory for offline tests."""

    def __init__(self, window_size: int = 12) -> None:
        self.window_size = window_size
        self._transcript: deque[TranscriptChunk] = deque(maxlen=window_size)
        self._participants: set[str] = set()
        self._recent_decisions: deque[dict[str, Any]] = deque(maxlen=10)

    def add_chunk(self, chunk: TranscriptChunk) -> None:
        self._transcript.append(chunk)
        self._participants.add(chunk.speaker)

    def add_decision(self, decision: dict[str, Any]) -> None:
        self._recent_decisions.append(decision)

    def snapshot(self, app_state: dict[str, Any] | None = None) -> dict[str, Any]:
        return {
            "meeting": {"id": "demo-meeting", "title": "Wedding Planning Review"},
            "participants": sorted(self._participants),
            "transcript_window": [chunk.model_dump(mode="json") for chunk in self._transcript],
            "recent_ai_decisions": list(self._recent_decisions),
            "application_state": app_state or {},
        }

    def transcript(self) -> list[TranscriptChunk]:
        return list(self._transcript)