"""流水线：把 6 步串起来，每步落库。INGEST_ENABLED=False 时只组装+存，不真实发送。

依赖都可注入（fetch/extract/chat/store），便于离线测试与替换平台。
"""
from __future__ import annotations

import logging
from typing import Callable, Optional

from creation_knowledge.config import Settings
from creation_knowledge.integrations.crawler import CrawlerError, fetch_post_detail
from creation_knowledge.integrations.db import CkStore
from creation_knowledge.integrations.extractor import ExtractorError, GeminiExtractor
from creation_knowledge.integrations.llm import ChatFn, default_chat
from creation_knowledge.ingest import IngestError, ingest as real_ingest
from creation_knowledge.models import ExtractedContent, Post
from creation_knowledge.stages import (
    build_ingest_payload,
    deconstruct_item,
    screen_post,
    split_post,
)

logger = logging.getLogger(__name__)

FetchFn = Callable[[str], Post]
ExtractFn = Callable[[Post], ExtractedContent]


def _process_one(
    url: str,
    *,
    settings: Settings,
    store: CkStore,
    fetch_fn: FetchFn,
    extract_fn: ExtractFn,
    chat: ChatFn,
    ingest_enabled: bool,
) -> dict:
    # 1) 拉取
    try:
        post = fetch_fn(url)
    except CrawlerError as exc:
        return {"url": url, "status": "fetch_failed", "error": str(exc)}

    # 1.5) 视频帖：抽帧补成卡片（best-effort，失败不阻塞整帖）
    if post.video_urls and not post.cards:
        try:
            from creation_knowledge.integrations.video_frames import extract_frames
            post.cards = extract_frames(
                post.video_urls[0],
                out_dir=f"{settings.frames_dir}/{post.id}",
                url_prefix=f"/frames/{post.id}",
                platform=post.platform,
                max_frames=settings.max_cards,
            )
        except Exception as exc:  # 抽帧失败不影响图文/正文路径
            logger.warning("post %s 抽帧失败: %s", post.id, exc)

    store.upsert_post(post)  # stage=fetched（含 cards）

    # 2) 多模态提取
    try:
        content = extract_fn(post)
        store.set_extracted(post.id, content.model_dump())  # stage=extracted
    except ExtractorError as exc:
        store.update_stage(post.id, "failed")
        return {"url": url, "post_id": post.id, "status": "extract_failed", "error": str(exc)}

    # 3) 筛选
    screening = screen_post(post, content, chat=chat)
    store.set_screening(post.id, screening.model_dump())  # stage=screened
    if not screening.passed:
        store.update_stage(post.id, "rejected")
        return {"url": url, "post_id": post.id, "status": "rejected",
                "score": screening.score, "reason": screening.reason}

    # 4) 拆分 -> 5) 解构 -> 6) 组装（+可选入库）
    items = split_post(post, content, chat=chat)
    item_ids = []
    for item in items:
        deco = deconstruct_item(item, chat=chat)
        payload = build_ingest_payload(post, item, deco)
        item_id = store.save_item(
            post.id, item.model_dump(), deco.model_dump(), payload.model_dump()
        )
        item_ids.append(item_id)
        if ingest_enabled:
            try:
                res = real_ingest(payload, settings=settings)
                store.update_item_ingest(item_id, "ingested", res.get("knowledge_id"))
            except IngestError:
                store.update_item_ingest(item_id, "failed", None)
    store.update_stage(post.id, "done")
    return {"url": url, "post_id": post.id, "status": "done", "items": len(item_ids)}


def run_pipeline(
    urls: list[str],
    *,
    settings: Optional[Settings] = None,
    env_file: str = ".env",
    ingest_enabled: Optional[bool] = None,
    store: Optional[CkStore] = None,
    fetch_fn: Optional[FetchFn] = None,
    extract_fn: Optional[ExtractFn] = None,
    chat: Optional[ChatFn] = None,
) -> list[dict]:
    settings = settings or Settings.from_env(env_file)
    ingest_enabled = settings.ingest_enabled if ingest_enabled is None else ingest_enabled
    store = store or CkStore(settings.pg)
    fetch_fn = fetch_fn or (lambda url: fetch_post_detail(url, settings=settings))
    extract_fn = extract_fn or GeminiExtractor.from_env(env_file=env_file).extract
    chat = chat or default_chat(env_file)

    results = []
    for url in urls:
        results.append(_process_one(
            url, settings=settings, store=store, fetch_fn=fetch_fn,
            extract_fn=extract_fn, chat=chat, ingest_enabled=ingest_enabled,
        ))
    return results