import json
from collections import defaultdict
from typing import Dict, List

from app.core.database import DatabaseManager
from app.core.observability import LogService

from ._const import DecodeCardConst
from ._mapper import CardDecodeTaskMapper
from ._utils import CardDecodeUtils


class CreateCardsDecodeTask(DecodeCardConst):
    def __init__(self, pool: DatabaseManager, log_service: LogService):
        self.pool = pool
        self.log_service = log_service
        self.mapper = CardDecodeTaskMapper(self.pool)
        self.tool = CardDecodeUtils()

    async def _acquire_cards(self) -> List[Dict]:
        """获取待解构卡片并加锁（status INIT → PROCESSING）"""
        cards = await self.mapper.fetch_cards()
        locked = []
        for card in cards:
            card_id = card["id"]
            acquired = await self.mapper.update_card_status(
                card_id, self.TaskStatus.INIT, self.TaskStatus.PROCESSING
            )
            if acquired:
                locked.append(card)
            else:
                await self.log_service.log(
                    contents={
                        "card_id": card_id,
                        "task": "create_card_decode_task",
                        "status": "skip",
                        "message": "acquire lock failed",
                    }
                )
        return locked

    async def _ensure_cover_ids(self, cards: List[Dict]):
        """为缺少 card_cover_id 的卡片下载封面并计算 MD5"""
        for card in cards:
            if card.get("card_cover_id"):
                continue
            if not card.get("share_cover"):
                continue  # 空封面留给 _submit_and_record 标记 FAILED
            try:
                cover_id = self.tool.compute_cover_md5(card["share_cover"])
                await self.mapper.set_card_cover_id(card["id"], cover_id)
                card["card_cover_id"] = cover_id
                await self.log_service.log(
                    contents={
                        "card_id": card["id"],
                        "task": "create_card_decode_task",
                        "status": "info",
                        "message": f"computed cover_id={cover_id}",
                    }
                )
            except Exception as e:
                await self.mapper.update_card_status(
                    card["id"],
                    self.TaskStatus.PROCESSING,
                    self.TaskStatus.FAILED,
                )
                await self.log_service.log(
                    contents={
                        "card_id": card["id"],
                        "share_cover": card.get("share_cover"),
                        "task": "create_card_decode_task",
                        "status": "fail",
                        "message": f"compute cover md5 failed, marked as FAILED: {e}",
                    }
                )

    @staticmethod
    def _group_cards_by_channel(cards: List[Dict]) -> Dict[int, List[Dict]]:
        """按 auto_reply_top_cards_daily.channel 分组，映射到对应的 config_id"""
        grouped = defaultdict(list)
        for card in cards:
            source_channel = card.get("channel", "")
            config_id = DecodeCardConst.CHANNEL_CONFIG_MAP.get(source_channel)
            if config_id:
                grouped[config_id].append(card)
        return dict(grouped)

    async def _submit_and_record_for_config(
        self, cards: List[Dict], config_id: int, source: int
    ):
        """对同一 config_id 的卡片执行提交与落库"""
        if not cards:
            return

        # 过滤已有任务记录的卡片（按 card_cover_id 去重）
        cards_with_cid = [c for c in cards if c.get("card_cover_id")]
        if not cards_with_cid:
            return

        # 跨批次去重：查 DB 已有任务
        all_source_ids = [str(c["card_cover_id"]) for c in cards_with_cid]
        existing = await self.mapper.fetch_existing_source_ids(
            all_source_ids, config_id, source
        )

        # 同批次去重：相同 card_cover_id 只保留第一条
        seen = set()
        deduped_cards = []
        intra_dups = []
        for c in cards_with_cid:
            cid = str(c["card_cover_id"])
            if cid in existing or cid in seen:
                intra_dups.append(c)
            else:
                seen.add(cid)
                deduped_cards.append(c)

        if intra_dups:
            await self.log_service.log(
                contents={
                    "task": "create_card_decode_task",
                    "config_id": config_id,
                    "message": f"Skipped {len(intra_dups)} duplicate cards (already submitted or same-batch)",
                }
            )
            for card in intra_dups:
                await self.mapper.update_card_status(
                    card["id"],
                    self.TaskStatus.PROCESSING,
                    self.TaskStatus.SUCCESS,
                )

        new_cards = deduped_cards

        if not new_cards:
            return

        posts = self.tool.prepare_posts(new_cards)
        submit_results = await self.tool.submit_decode_batch(posts, config_id=config_id)
        posts_by_cid = {p["channelContentId"]: p for p in posts}

        for card in new_cards:
            source_id = str(card["card_cover_id"])
            card_id = card["id"]
            result = submit_results.get(source_id)

            if not result:
                await self.mapper.update_card_status(
                    card_id, self.TaskStatus.PROCESSING, self.TaskStatus.INIT
                )
                await self.log_service.log(
                    contents={
                        "card_id": card_id,
                        "source_id": source_id,
                        "config_id": config_id,
                        "task": "create_card_decode_task",
                        "status": "fail",
                        "message": "no response for source_id, rolled back to INIT",
                    }
                )
                continue

            status = result.get("status")
            if status == self.SubmitStatus.FAILED:
                await self.mapper.update_card_status(
                    card_id, self.TaskStatus.PROCESSING, self.TaskStatus.INIT
                )
                await self.log_service.log(
                    contents={
                        "card_id": card_id,
                        "source_id": source_id,
                        "config_id": config_id,
                        "task": "create_card_decode_task",
                        "status": "fail",
                        "data": result,
                    }
                )
                continue

            if status == self.SubmitStatus.SUCCESS:
                query_results = await self.tool.query_decode_results_batch(
                    [source_id], config_id=config_id
                )
                result_data = query_results.get(source_id)
                if (
                    result_data
                    and result_data.get("status") == self.QueryStatus.SUCCESS
                ):
                    data_content = result_data.get("dataContent") or "{}"
                    html = result_data.get("html")
                    await self.mapper.insert_decode_task(
                        source_id=source_id,
                        config_id=config_id,
                        source=source,
                        payload=json.dumps(
                            posts_by_cid.get(source_id, {}), ensure_ascii=False
                        ),
                        remark="提交时已有解构结果，直接落库",
                    )
                    await self.mapper.set_decode_result(
                        source_id=source_id,
                        config_id=config_id,
                        result=json.dumps(
                            {"dataContent": data_content, "html": html},
                            ensure_ascii=False,
                        ),
                        remark="提交时已返回 SUCCESS，结果已落库",
                    )
                    await self.mapper.update_card_status(
                        card_id, self.TaskStatus.PROCESSING, self.TaskStatus.SUCCESS
                    )
                    await self.log_service.log(
                        contents={
                            "card_id": card_id,
                            "source_id": source_id,
                            "config_id": config_id,
                            "task": "create_card_decode_task",
                            "status": "success",
                            "message": "decode result already available on submit",
                        }
                    )
                else:
                    await self.mapper.insert_decode_task(
                        source_id=source_id,
                        config_id=config_id,
                        source=source,
                        payload=json.dumps(
                            posts_by_cid.get(source_id, {}), ensure_ascii=False
                        ),
                        remark="提交返回SUCCESS，查询未果，等待轮询",
                        status=self.TaskStatus.PROCESSING,
                    )
                    await self.mapper.update_card_status(
                        card_id, self.TaskStatus.PROCESSING, self.TaskStatus.SUCCESS
                    )
                    await self.log_service.log(
                        contents={
                            "card_id": card_id,
                            "source_id": source_id,
                            "config_id": config_id,
                            "task": "create_card_decode_task",
                            "status": "pending",
                            "message": "submit SUCCESS but query not ready, inserted for polling",
                        }
                    )
            elif status == self.SubmitStatus.PENDING:
                await self.mapper.insert_decode_task(
                    source_id=source_id,
                    config_id=config_id,
                    source=source,
                    payload=json.dumps(
                        posts_by_cid.get(source_id, {}), ensure_ascii=False
                    ),
                    remark="卡片解构任务已提交，等待轮询",
                    status=self.TaskStatus.PROCESSING,
                )
                await self.mapper.update_card_status(
                    card_id, self.TaskStatus.PROCESSING, self.TaskStatus.SUCCESS
                )
                await self.log_service.log(
                    contents={
                        "card_id": card_id,
                        "source_id": source_id,
                        "config_id": config_id,
                        "task": "create_card_decode_task",
                        "status": "pending",
                        "message": "task submitted, waiting for polling",
                    }
                )
            else:
                await self.mapper.update_card_status(
                    card_id, self.TaskStatus.PROCESSING, self.TaskStatus.INIT
                )
                await self.log_service.log(
                    contents={
                        "card_id": card_id,
                        "source_id": source_id,
                        "config_id": config_id,
                        "task": "create_card_decode_task",
                        "status": "fail",
                        "message": f"unexpected submit status: {status}, rolled back to INIT",
                        "data": result,
                    }
                )

    async def _submit_and_record(self, cards: List[Dict]):
        if not cards:
            return

        # 无 share_cover 的卡片直接标记失败
        valid_cards = []
        for card in cards:
            if not card.get("share_cover"):
                await self.mapper.update_card_status(
                    card["id"],
                    self.TaskStatus.PROCESSING,
                    self.TaskStatus.FAILED,
                )
                await self.log_service.log(
                    contents={
                        "card_id": card["id"],
                        "task": "create_card_decode_task",
                        "status": "fail",
                        "message": "share_cover is empty, marked as FAILED",
                    }
                )
            else:
                valid_cards.append(card)

        if not valid_cards:
            return

        grouped = self._group_cards_by_channel(valid_cards)
        for config_id, group_cards in grouped.items():
            source_channel = group_cards[0]["channel"]
            source = self.CHANNEL_SOURCE_MAP[source_channel]
            await self._submit_and_record_for_config(group_cards, config_id, source)

        # 处理不在映射表中的卡片（回滚状态）
        mapped_ids = {id(c) for g in grouped.values() for c in g}
        for card in valid_cards:
            if id(card) not in mapped_ids:
                await self.mapper.update_card_status(
                    card["id"],
                    self.TaskStatus.PROCESSING,
                    self.TaskStatus.INIT,
                )
                await self.log_service.log(
                    contents={
                        "card_id": card["id"],
                        "channel": card.get("channel"),
                        "task": "create_card_decode_task",
                        "status": "fail",
                        "message": "unknown channel, rolled back to INIT",
                    }
                )

    async def deal(self):
        cards = await self._acquire_cards()
        if not cards:
            await self.log_service.log(
                contents={
                    "task": "create_card_decode_task",
                    "message": "No more cards to decode",
                }
            )
            return

        await self._ensure_cover_ids(cards)
        await self._submit_and_record(cards)
        await self.log_service.log(
            contents={
                "task": "create_card_decode_task",
                "message": f"Processed {len(cards)} cards",
            }
        )


__all__ = ["CreateCardsDecodeTask"]