import pymysql
from pymysql import OperationalError, InterfaceError
from tqdm import tqdm
import time
import psutil
import logging

logger = logging.getLogger(__name__)


class SyncService:
    def __init__(self, mysql_conn, ch_conn, mapper):
        self.mysql_conn = mysql_conn
        self.ch_conn = ch_conn
        self.mapper = mapper
        self.columns = None
        self.full_sync_interval = 24 * 3600  # 24小时全量同步一次
        self.last_full_sync = 0
        self.recent_check_count = 5000  # 近期数据检查条数

    def sync_data(self, table, batch_size):
        """智能同步策略"""
        current_time = time.time()
        self.columns = self._load_table_columns(table)

        if current_time - self.last_full_sync > self.full_sync_interval:
            self._full_sync(table, batch_size)
            self.last_full_sync = current_time
        else:
            self._incremental_sync(table, batch_size)

    def _full_sync(self, table, batch_size):
        """全量同步"""
        logger.info(f"🚀 开始全量同步{table}")

        mysql_conn = self.mysql_conn.connect()
        try:
            with mysql_conn.cursor() as count_cursor:
                count_cursor.execute(f"SELECT COUNT(*) FROM {table}")
                total = count_cursor.fetchone()[0]

            with mysql_conn.cursor(pymysql.cursors.SSCursor) as cursor:
                cursor.execute(f"SELECT * FROM {table} ORDER BY id")
                self._sync_with_cursor(cursor, total, table, batch_size)

        except Exception as e:
            logger.error(f"全量同步失败: {str(e)}")
        finally:
            mysql_conn.close()
        logger.info(f"✅ 全量同步{table}完成")

    def _incremental_sync(self, table, batch_size):
        """增量同步（含近期数据保障）"""
        last_id = self._get_last_id_from_ch(table)
        logger.info(f"🔁 开始增量同步{table}，起始ID: {last_id}")

        # 标准增量同步
        mysql_conn = self.mysql_conn.connect()
        try:
            with mysql_conn.cursor() as count_cursor:
                count_cursor.execute(
                    f"SELECT COUNT(*) FROM {table} WHERE id > {last_id}"
                )
                total = count_cursor.fetchone()[0]

            with mysql_conn.cursor(pymysql.cursors.SSCursor) as cursor:
                cursor.execute(
                    f"SELECT * FROM {table} WHERE id > {last_id} ORDER BY id"
                )
                self._sync_with_cursor(cursor, total, table, batch_size)

        finally:
            mysql_conn.close()

        # 近期数据保障同步
        self._sync_recent_data(table, batch_size)
        logger.info(f"✅ 增量同步{table}完成，最后ID: {self._get_last_id_from_ch(table)}")

    def _sync_recent_data(self, table, batch_size):
        """近期数据保障同步"""
        logger.info(f"🔄 开始同步{table}最近{self.recent_check_count}条数据")

        mysql_conn = self.mysql_conn.connect()
        try:
            with mysql_conn.cursor() as cursor:
                cursor.execute(f"SELECT MAX(id) FROM {table}")
                max_id = cursor.fetchone()[0] or 0

            if max_id <= 0:
                return

            start_id = max(max_id - self.recent_check_count, 0)

            with mysql_conn.cursor(pymysql.cursors.SSCursor) as cursor:
                cursor.execute(
                    f"SELECT * FROM {table} WHERE id >= {start_id} ORDER BY id"
                )

                total = max_id - start_id + 1
                progress = tqdm(total=total, desc="近期数据", unit="rec")
                batch = []

                while True:
                    row = cursor.fetchone()
                    if not row:
                        break

                    mapped = self.mapper.map_row(self.columns, row)
                    batch.append(mapped)

                    if len(batch) >= batch_size:
                        self._insert_batch(batch, table)
                        progress.update(len(batch))
                        batch = []

                if batch:
                    self._insert_batch(batch, table)
                    progress.update(len(batch))

                progress.close()

        except Exception as e:
            logger.error(f"近期数据同步失败: {str(e)}")
        finally:
            mysql_conn.close()

        logger.info(f"🆗 近期数据同步范围ID: {start_id}-{max_id}")

    def _sync_with_cursor(self, cursor, total, table, batch_size):
        """通用同步流程"""
        progress = tqdm(total=total, desc="同步进度", unit="rec")
        batch = []
        last_success_time = time.time()

        while True:
            try:
                if time.time() - last_success_time > 300:  # 5分钟连接检查
                    cursor.connection.ping(reconnect=True)
                    last_success_time = time.time()

                row = cursor.fetchone()
                if not row:
                    break

                mapped = self.mapper.map_row(self.columns, row)
                batch.append(mapped)

                if len(batch) >= batch_size:
                    self._insert_batch(batch, table)
                    progress.update(len(batch))
                    batch = []
                    last_success_time = time.time()

            except (OperationalError, InterfaceError) as e:
                logger.warning("连接中断，尝试重新连接...")
                cursor.connection.ping(reconnect=True)
                time.sleep(5)
                continue

        if batch:
            self._insert_batch(batch, table)
            progress.update(len(batch))

        progress.close()

    def _get_last_id_from_ch(self, table):
        """获取ClickHouse最大ID"""
        try:
            result = self.ch_conn.connect().execute(f"SELECT max(id) FROM {table}")
            return result[0][0] or 0
        except Exception as e:
            logger.error(f"获取最大ID失败: {str(e)}")
            return 0

    def _load_table_columns(self, table):
        """加载表的列信息"""
        result = self.ch_conn.connect().execute(f"DESCRIBE TABLE {table}")
        return [row[0] for row in result]

    def _insert_batch(self, batch, table):
        """带内存监控的批量插入"""
        mem = psutil.virtual_memory()
        if mem.percent > 90:
            logger.warning("内存使用超过90%，暂停处理60秒")
            time.sleep(60)

        try:
            self.ch_conn.connect().execute(
                f'INSERT INTO {table} VALUES',
                batch,
                types_check=True,
                settings={
                    'date_time_input_format': 'best_effort',
                    'allow_experimental_analyzer': 0,
                    'input_format_null_as_default': 1,
                    'max_partitions_per_insert_block': 500
                }
            )
        except Exception as e:
            logger.error(f"批量插入失败: {str(e)}")
            # 可选添加重试逻辑