"""
author: CT
description: 导出待计算利润率的 ASIN(修复漏洞: 不再仅依赖 keepa 近 1 天更新)
             【数据流】
              flow_asin 池: Hive dwt_flow_asin 最近 3 月 ∪ Doris dwt.{site}_flow_asin_30day
                            → (asin, price) 去重保留 asin_crawl_date 最新
              两路合并:
                A) keepa 变动重算: flow_asin INNER JOIN keepa(updated_time >= date_info-1天)
                B) 新组合(asin,price)首次计算: flow_asin LEFT ANTI 利润率已计算快照
                                                INNER JOIN keepa(全量,无时间过滤)
              A ∪ B → 按 (asin, price) 去重保留 asin_crawl_date 最新
              → LEFT JOIN 分类 → 派生 source_month / part_key → 写 PG {site}_asin_profit_rate_calc
             【近 3 月窗口】
              通过 MySQL workflow_everyday.MAX(report_date) WHERE date_type='month' AND page='流量选品'
              向前推 3 个月(参考 export_keepa_asin_del.py)
             【已计算判断】
              hive dim_asin_profit_rate_info 全量(只保留最新分区,按 site_name 过滤即可),
              按 (asin, price) LEFT ANTI 剔除
             【keepa 来源】
              hive dim_keepa_asin_info 只保留最新分区,按 site_name 过滤即可
执行示例: spark-submit export_need_profit_rate.py us 2026-06-15
"""
import os
import sys
from datetime import datetime, timedelta
from dateutil.relativedelta import relativedelta

sys.path.append(os.path.dirname(sys.path[0]))

from pyspark.sql import functions as F, Window

from utils.spark_util import SparkUtil
from utils.db_util import DBUtil
from utils.DorisHelper import DorisHelper


class ExportNeedProfitRate(object):

    def __init__(self, site_name, date_info):
        self.site_name = site_name
        self.date_info = date_info  # 计算时间 yyyy-MM-dd
        # keepa 增量过滤下限：date_info - 1 天
        self.last_date_info = (datetime.strptime(date_info, "%Y-%m-%d").date() - timedelta(days=1)).strftime("%Y-%m-%d")
        self.spark = SparkUtil.get_spark_session(
            f"{self.__class__.__name__}: {self.site_name} {self.date_info}"
        )

    def run(self):
        df_export = self.build_export_df()
        self.write_to_pg(df_export)

    # ---------------- 公共数据池: flow_asin 近 3 月 ----------------

    def _get_recent_3_months(self):
        """通过 MySQL workflow_everyday 拿最大 report_date 向前推 3 月(参考 export_keepa_asin_del.py)"""
        sql_max_month = (
            f"select MAX(report_date) as date_info from workflow_everyday "
            f"where site_name = '{self.site_name}' and date_type = 'month' and page = '流量选品'"
        )
        print(f"sql_max_month=\n{sql_max_month}")
        mysql_con = DBUtil.get_connection_info('mysql', self.site_name)
        max_date_info = SparkUtil.read_jdbc_query(
            session=self.spark, url=mysql_con['url'],
            pwd=mysql_con['pwd'], username=mysql_con['username'], query=sql_max_month,
        ).collect()[0]['date_info']
        print(f"workflow_everyday 最大 report_date: {max_date_info}")
        base_dt = datetime.strptime(str(max_date_info), '%Y-%m')
        months_3 = [(base_dt - relativedelta(months=i)).strftime('%Y-%m') for i in range(3)]
        print(f"近 3 月窗口: {months_3}")
        return months_3

    def _build_flow_asin_pool(self):
        """flow_asin 池: Hive dwt_flow_asin 近 3 月 ∪ Doris {site}_flow_asin_30day
           → (asin, price) 去重保留 asin_crawl_date 最新"""
        months_3 = self._get_recent_3_months()
        months_in = ",".join([f"'{m}'" for m in months_3])

        # 1. Hive dwt_flow_asin 近 3 月
        sql_dwt = f"""
            SELECT asin,
                   asin_price       AS price,
                   category_first_id,
                   asin_crawl_date
            FROM dwt_flow_asin
            WHERE site_name = '{self.site_name}'
              AND date_type = 'month'
              AND date_info IN ({months_in})
              AND asin_price > 0
        """
        print(f"sql_dwt =\n{sql_dwt}")
        df_dwt = self.spark.sql(sqlQuery=sql_dwt) \
            .withColumn('price', F.round(F.col('price'), 2).cast('decimal(20,2)')) \
            .withColumn('asin_crawl_date', F.to_timestamp(F.col('asin_crawl_date')))

        # 2. Doris dwt.{site}_flow_asin_30day(保留: 月数据可能延迟,30day 兜底)
        table_identifier = f"dwt.{self.site_name}_flow_asin_30day"
        read_fields = "asin,price,category_first_id,asin_crawl_date"
        df_doris = DorisHelper.spark_import_with_connector(self.spark, table_identifier, read_fields) \
            .filter(F.col('price') > 0) \
            .withColumn('price', F.round(F.col('price'), 2).cast('decimal(20,2)')) \
            .withColumn('asin_crawl_date', F.col('asin_crawl_date').cast('timestamp')) \
            .select('asin', 'price', 'category_first_id', 'asin_crawl_date')

        # 3. union + (asin, price) 去重保留最新 asin_crawl_date
        df_flow = df_dwt.unionByName(df_doris).repartition(40, 'asin', 'price')
        window = Window.partitionBy('asin', 'price').orderBy(F.col('asin_crawl_date').desc_nulls_last())
        df_flow = df_flow.withColumn('rk', F.row_number().over(window)) \
                         .filter('rk = 1') \
                         .drop('rk') \
                         .cache()
        print(f"flow_asin 池数据量(去重后): {df_flow.count():,}")
        return df_flow

    # ---------------- keepa 数据源 ----------------

    def _read_keepa(self, only_recent_update):
        """从 Hive dim_keepa_asin_info 读 keepa
           only_recent_update=True : 仅近 1 天更新(updated_time >= last_date_info), 路径 A 用
           only_recent_update=False: 全量(keepa 历史就有的 asin), 路径 B 用
           过滤规则一致: 包装长宽高 > 0, weight 取 item_weight 优先 / package_weight 兜底
        """
        where_clause = (
            f"WHERE site_name = '{self.site_name}' AND updated_time >= '{self.last_date_info}'"
            if only_recent_update
            else f"WHERE site_name = '{self.site_name}'"
        )
        sql_keepa = f"""
            SELECT asin, package_length, package_width, package_height,
                   CASE WHEN item_weight > 0    THEN item_weight
                        WHEN package_weight > 0 THEN package_weight
                        ELSE NULL
                   END AS weight
            FROM dim_keepa_asin_info
            {where_clause}
        """
        print(f"sql_keepa (only_recent_update={only_recent_update}) =\n{sql_keepa}")
        return self.spark.sql(sqlQuery=sql_keepa) \
            .filter((F.col('package_length') > 0) &
                    (F.col('package_width') > 0) &
                    (F.col('package_height') > 0) &
                    (F.col('weight') > 0)) \
            .repartition(40, 'asin')

    # ---------------- 已计算过利润率的快照(路径 B 用作 LEFT ANTI 基准) ----------------

    def _read_profit_rate_latest_snapshot(self):
        """读 hive dim_asin_profit_rate_info(全站点过滤),按 (asin, price) 去重,作为"已计算过"基准"""
        sql_profit = f"""
            SELECT asin, price
            FROM dim_asin_profit_rate_info
            WHERE site_name = '{self.site_name}'
        """
        print(f"sql_profit =\n{sql_profit}")
        return self.spark.sql(sqlQuery=sql_profit) \
            .withColumn('price', F.round(F.col('price'), 2).cast('decimal(20,2)')) \
            .dropDuplicates(['asin', 'price']) \
            .repartition(40, 'asin', 'price')

    # ---------------- 主流程 ----------------

    def build_export_df(self):
        df_flow = self._build_flow_asin_pool()

        # 路径 A: flow_asin INNER keepa(近 1 天更新)
        df_keepa_recent = self._read_keepa(only_recent_update=True)
        df_a = df_flow.join(df_keepa_recent, on='asin', how='inner')

        # 路径 B: flow_asin LEFT ANTI 已算过 INNER keepa(全量)
        df_profit_existing = self._read_profit_rate_latest_snapshot()
        df_flow_new = df_flow.join(df_profit_existing, on=['asin', 'price'], how='left_anti')
        df_keepa_all = self._read_keepa(only_recent_update=False)
        df_b = df_flow_new.join(df_keepa_all, on='asin', how='inner')

        # A ∪ B: (asin, price) 去重保留 asin_crawl_date 最新
        df_union = df_a.unionByName(df_b).repartition(40, 'asin', 'price')
        window = Window.partitionBy('asin', 'price').orderBy(F.col('asin_crawl_date').desc_nulls_last())
        df_need = df_union.withColumn('rk', F.row_number().over(window)) \
                          .filter('rk = 1') \
                          .drop('rk') \
                          .cache()
        print(f"A ∪ B 合并去重后数据量: {df_need.count():,}")

        # 分类名 LEFT JOIN
        sql_cate = f"""
            SELECT category_first_id, en_name AS category
            FROM dim_bsr_category_tree
            WHERE site_name = '{self.site_name}' AND nodes_num = 2
        """
        df_cate = self.spark.sql(sqlQuery=sql_cate)

        df_result = df_need \
            .join(df_cate, on='category_first_id', how='left') \
            .withColumn('asin_crawl_date', F.coalesce(F.col('asin_crawl_date'), F.current_timestamp())) \
            .withColumn('source_month', F.coalesce(F.date_format(F.col('asin_crawl_date'), 'yyyy-MM'),
                                                   F.date_format(F.current_timestamp(), 'yyyy-MM'))) \
            .withColumn('part_key', F.ntile(50).over(Window.orderBy(F.rand()))) \
            .select(
                'asin', 'price', 'category',
                'package_length', 'package_width', 'package_height', 'weight',
                'part_key', 'source_month', 'asin_crawl_date',
            ).cache()

        count = df_result.count()
        print(f"待计算利润率数据量: {count:,}")
        df_result.show(10, truncate=False)
        df_flow.unpersist()
        df_need.unpersist()
        return df_result

    def write_to_pg(self, df_export):
        con_info   = DBUtil.get_connection_info(db_type='postgresql_cluster', site_name=self.site_name)
        table_name = f"{self.site_name}_asin_profit_rate_calc"
        print(f"导出到 PG {table_name}")
        df_export.write.format("jdbc") \
            .option("url",      con_info["url"]) \
            .option("dbtable",  table_name) \
            .option("user",     con_info["username"]) \
            .option("password", con_info["pwd"]) \
            .mode("append") \
            .save()
        print("success")


if __name__ == "__main__":
    site_name = sys.argv[1]
    date_info = sys.argv[2]
    ExportNeedProfitRate(site_name, date_info).run()
