# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
# useful for handling different item types with a single interface
from __future__ import annotations
import re
import json
import logging
from datetime import datetime
from typing import TYPE_CHECKING, Tuple, Union, Optional
import scrapy
from itemadapter import ItemAdapter
from kafka import KafkaProducer
from pymongo import MongoClient
from pymongo.errors import (
    DuplicateKeyError,
    BulkWriteError
)
from science_article_cssci.db_utils.mongo import MongoDBUtils, build_update_query
from science_article_cssci.db_utils.kafka import KafkaUtil
from science_article_cssci.scripts.field_assembly import FieldAssembly

if TYPE_CHECKING:
    from scrapy.crawler import Crawler
    from scrapy.statscollectors import StatsCollector
    from pymongo.collection import Collection

mongo_logger = logging.getLogger('pymongo')
mongo_logger.setLevel(logging.WARNING)
logging.getLogger('kafka').setLevel(logging.WARNING)
logger = logging.getLogger(__name__)


class ScienceArticleCssciPipeline:
    def process_item(self, item, spider):
        return item


class MongoPipeline(MongoDBUtils):
    def __init__(self, mongo_uri, mongo_db, stats: StatsCollector):
        super().__init__(mongo_uri, mongo_db)
        self.stats: StatsCollector = stats
        self.insert_failure_update_enable = True
        self.duplicate_cover_enable = False  # 重复项覆盖

    @classmethod
    def from_crawler(cls, crawler: Crawler):
        m = cls(
            mongo_uri=crawler.settings.get("MONGO_URI"),
            mongo_db=crawler.settings.get("MONGO_DATABASE", "items"),
            stats=crawler.stats
        )
        return m

    def open_spider(self, spider):
        self.client = MongoClient(self.mongo_uri)
        self.db = self.client[self.mongo_db]

    def process_item(self, item, spider) -> scrapy.Item:
        """
        插入遇到错误不处理
        """
        adapter = ItemAdapter(item)
        tablename = self._get_item_table(item)
        collection = self.db.get_collection(tablename)
        d = adapter.asdict()
        try:
            collection.insert_one(d)
            self.stats.inc_value("item2db_inserted/{}".format(tablename))
        except DuplicateKeyError as duplicate_error:
            self.stats.inc_value("item2db_duplicate/{}".format(tablename))
            self.stats.inc_value(f"item_dropped_reasons_count/duplicate")
        except Exception:
            raise
        return item

    def process_item_update(self, item, spider) -> scrapy.Item:
        """
        插入遇到错误进行更新
        """
        adapter = ItemAdapter(item)
        tablename = self._get_item_table(item)
        collection = self.db.get_collection(tablename)
        d = adapter.asdict()
        try:
            collection.insert_one(d)
            self.stats.inc_value("item2db_inserted/{}".format(tablename))
        except DuplicateKeyError as duplicate_error:
            if self.insert_failure_update_enable:
                write_error = duplicate_error.details
                filter_query, update_query = self._pick_filter_update(write_error, doc=d)
                updated_at_query = None  # 删除不确定因素的时间防止影响更新（更新除了task_id外的字段不需要处理这个）

                key_pattern = write_error.get('keyPattern')
                key_value = write_error.get('keyValue')
                logger.debug("dupKey: %s, keyValue: %s", key_pattern, key_value)

                # 专门用来适配增量的任务
                task_ids = update_query.pop("task_ids", None)
                if task_ids:
                    # task_id一定会引起变动，所以先处理
                    task_id_query = {'task_ids': task_ids}
                    collection.update_one(filter=filter_query, update=build_update_query(task_id_query, replace=False))
                    updated_at_query = {"updated_at": update_query.pop('updated_at', None)}

                update_q = build_update_query(update_query, replace=self.duplicate_cover_enable)
                up_result = collection.update_one(filter=key_value, update=update_q, upsert=True)
                if up_result.matched_count == up_result.modified_count == 1:
                    # 变动了就要修改更新的时间（其实没变也要更新，这样可以知道什么时候动过这条数据）
                    if updated_at_query:
                        collection.update_one(filter=key_value, update={"$set": updated_at_query})
                    self.stats.inc_value("item2db_updated/{}".format(tablename))
        except Exception:
            raise

        return item

    @staticmethod
    def _pick_filter_update(write_error, doc: dict = None):
        original_doc = write_error.get('op', doc)  # 插入的数据
        key_pattern = write_error.get('keyPattern')
        original_doc.pop("_id", None)  # 删掉插入失败产生的_id
        filter_query = {}
        update_query = {key: val for key, val in original_doc.items() if val}

        for key in key_pattern.keys():
            filter_query.update({key: update_query.pop(key, None)})
        return filter_query, update_query

    def close_spider(self, spider):
        self.client.close()

    @staticmethod
    def _get_item_table(item) -> str:
        """获取Item类型"""
        if hasattr(item, '__tablename__'):
            return item.__class__.__tablename__
        return 'items_null_table'


class Mongo2SciencePipeline(MongoPipeline):
    def process_item(self, item, spider):
        d = self.parse2science(item)
        table = self._get_item_table(item)
        coll = self.db.get_collection(table)
        return d

    @staticmethod
    def parse2science(item) -> dict:
        def change_qi(tmp_str):
            return re.sub(r'^0|0$', '', tmp_str)

        def change_string(tmp_str):
            tmp = tmp_str.split("aaa")
            tmp_z = []
            for t in tmp:
                if len(t) > 1:
                    tmp_z.append(t)
            return tmp_z

        adapter = ItemAdapter(item)
        third_id = adapter['third_id']
        resp_raw = adapter['resp_raw']
        resp_raw = json.loads(resp_raw)
        authors: list = resp_raw['author']
        authors = [dict(zzmc=au_info['zzmc'], jgmc=au_info['jgmc'], bmmc=au_info['bmmc']) for au_info in
                   authors or []]  # 作者.学校.院系
        # pprint(authors)
        catations: list = resp_raw.get('catation')
        contents: list = resp_raw.get('contents', [])
        body = [c for c in contents if c.get("sno") == adapter['third_id']]
        if body:
            content = body[0]
        else:
            content = {}
        d = dict(
            sno=third_id,
            lypm=content['lypm'],  # 篇名
            blpm=content['blpm'],  # 英文篇名
            zzjg=authors,  # 作者和机构
            wzlx=content['wzlx'],  # 文献类型
            xkfl1=content['xkfl1'],  # 学科类别1
            xkfl2=content.get('xkfl2', ''),  # 学科类别2
            xkdm1=content['xkdm1'],  # 中图类号1
            xkdm2=content.get('xkdm2', ''),  # 中图类号2
            xmlb=content.get('xmlb', ''),  # 基金项目
            qkmc=content.get('qkmc', ''),  # 来源期刊
            # (nian)年(juan)卷第(qi).replace(/^0|0$/g,'')期：(ym)
            nian=content.get('nian', ''),  # 年
            juan=content.get('juan', ''),  # 卷
            qi=content.get('qi', ''),  # 期
            ym=content.get('ym', ''),  # 页码
            byc=change_string(content.get('byc', '')),  # 关键词
            ckwx=catations  # 参考文献
        )
        return d


class BuildDetailPipeline:
    def process_item(self, item, spider):
        adapter = ItemAdapter(item)
        item['detailed'] = self.build_detailed(adapter)

        return item

    @staticmethod
    def build_detailed(item):
        resp_raw = item.get("resp_raw")
        dd = dict(
            **FieldAssembly.parse_detail(
                content=resp_raw.get('content'),
                author=resp_raw.get('author'),
                catation=resp_raw.get('catation'),
            )
        )
        return dd


class KafkaPipeline:
    def __init__(self, kafka_servers, topic):
        self.kafka_servers = kafka_servers
        self.topic = topic
        self.producer: KafkaProducer = None

    @classmethod
    def from_crawler(cls, crawler):
        return cls(
            kafka_servers=crawler.settings.get('KAFKA_SERVERS', 'localhost:9092'),
            topic=crawler.settings.get('KAFKA_TOPIC', 'scrapy_items')
        )

    def open_spider(self, spider):
        self.producer: KafkaProducer = KafkaProducer(
            bootstrap_servers=self.kafka_servers,
            value_serializer=lambda v: json.dumps(v, ensure_ascii=False).encode('utf-8'),
            acks='all',
            linger_ms=50,  # 等待时间，最多等待 50ms 封包发送
            compression_type='gzip',
        )
        spider.logger.info(f"Connected to Kafka at {self.kafka_servers}")

    def close_spider(self, spider):
        if self.producer:
            self.producer.flush()
            self.producer.close()
            spider.logger.info("Kafka connection closed")

    def process_item(self, item, spider):
        adapter = ItemAdapter(item)
        d = adapter.asdict()
        d = self.build2kafka(d)
        # 发送到Kafka
        future = self.producer.send(
            topic=self.topic,
            value=d,
            headers=[('source_type', b'cssci')]
        )
        future.add_callback(self.on_send_success)
        future.add_callback(self.on_send_success)
        return item

    def on_send_success(self, record_metadata):
        """发送成功回调"""
        pass

    def on_send_error(self, excp):
        """发送失败回调"""
        pass

    def build2kafka(self, item: dict) -> dict:
        dd = dict(
            id=item.get("third_id"),
            school_id="999",
            **item.get('detailed'),
            updated_time="2025-11-01 09:01:56"
        )
        dd.pop("references", None)
        return dd