"""
MemoirOrchestrator：按 segment 编排流水线，调用各 Specialist Agent。
负责：遍历 segments、按 category 聚合、调用 Specialist、更新 state；
持久化与章节生成由 process_category 回调完成。
"""

from __future__ import annotations

from dataclasses import dataclass
from typing import Any, Callable, Dict, List, Set, Tuple

from app.agents.memoir.classification_agent import (
    ClassificationAgent,
)
from app.agents.memoir.classification_agent import (
    _detect_stage as detect_stage_from_keywords,
)
from app.agents.memoir.extraction_agent import ExtractionAgent, ExtractionResult
from app.agents.state_schema import MemoirStateSchema
from app.core.logging import get_logger
from app.features.conversation.models import Segment

logger = get_logger(__name__)


@dataclass
class PreparedMemoirBatches:
    """Explicit batching result: updated state + segments grouped by chapter category."""

    state: MemoirStateSchema
    category_to_segments: Dict[str, List[Segment]]


class MemoirOrchestrator:
    """
    回忆录生成编排器。
    遍历 segments → ExtractionAgent → ClassificationAgent → 按 category 聚合 →
    调用 process_category 生成叙事并持久化。
    """

    def __init__(self) -> None:
        self.extraction_agent = ExtractionAgent()
        self.classification_agent = ClassificationAgent()

    def prepare_batches(
        self,
        *,
        segments: List[Segment],
        llm: Any,
        get_or_create_state: Callable[[], MemoirStateSchema],
        update_slot: Callable[[str, str, str, List[str]], MemoirStateSchema],
    ) -> PreparedMemoirBatches:
        """
        遍历 segments：Extraction → slot 更新 → Classification → 按 category 分桶。
        不含锁与写章节/故事（由调用方显式执行）。
        """
        state = get_or_create_state()
        category_to_segments: Dict[str, List[Segment]] = {}

        for segment in segments:
            text = segment.transcript_text or ""
            initial_stage = detect_stage_from_keywords(
                text, state.current_stage or "childhood"
            )
            stage_slots_raw = state.slots.get(initial_stage, {}) or {}

            result: ExtractionResult = self.extraction_agent.extract(
                user_message=text,
                current_stage=state.current_stage or "childhood",
                stage_slots=stage_slots_raw,
                llm=llm,
            )
            detected_stage = result.detected_stage
            for slot_name, snippet in result.slots.items():
                state = update_slot(detected_stage, slot_name, snippet, [segment.id])

            chapter_category = self.classification_agent.classify(
                text=text,
                fallback_stage=detected_stage,
                llm=llm,
            )
            if chapter_category is None:
                logger.debug(
                    "段落无回忆录价值，跳过: segment_id=%s transcript=%s",
                    segment.id,
                    getattr(segment, "transcript_text", None) or "",
                )
                continue
            category_to_segments.setdefault(chapter_category, []).append(segment)

        return PreparedMemoirBatches(
            state=state,
            category_to_segments=category_to_segments,
        )

    def run(
        self,
        *,
        segments: List[Segment],
        llm: Any,
        user_profile: str = "",
        user_birth_year: Any = None,
        get_or_create_state: Callable[[], MemoirStateSchema],
        update_slot: Callable[[str, str, str, List[str]], MemoirStateSchema],
        acquire_lock: Callable[[str], bool],
        release_lock: Callable[[str], None],
        process_category: Callable[
            [
                str,
                List[Segment],
                MemoirStateSchema,
                str,
                Any,
                Any,
            ],
            Tuple[Any, bool],
        ],
        raise_retry: Callable[[], None],
    ) -> Tuple[Set[str], int]:
        """
        执行回忆录流水线。
        process_category(category, segments, state, user_profile, user_birth_year, llm)
        返回 (chapter, has_images_to_generate)。
        返回 (chapters_to_enqueue, processed_count)。
        raise_retry 用于锁竞争时抛出 Celery retry。
        """
        prepared = self.prepare_batches(
            segments=segments,
            llm=llm,
            get_or_create_state=get_or_create_state,
            update_slot=update_slot,
        )
        state = prepared.state
        chapters_to_enqueue: Set[str] = set()
        category_to_segments = prepared.category_to_segments

        # 按 category 调用 process_category：叙事生成、持久化、封面入队标记
        for chapter_category, category_segments in category_to_segments.items():
            if not acquire_lock(chapter_category):
                logger.warning(
                    "章节锁竞争: category=%s, 延迟重试",
                    chapter_category,
                )
                raise_retry()

            try:
                chapter, has_images = process_category(
                    chapter_category,
                    category_segments,
                    state,
                    user_profile,
                    user_birth_year,
                    llm,
                )
                if chapter and has_images:
                    chapters_to_enqueue.add(chapter.id)
            finally:
                release_lock(chapter_category)

        return chapters_to_enqueue, len(segments)