# -*- coding:utf-8 -*-

from typing import Dict

from dw_base.datax.datasources.data_source import DataSource

# HDFS Data Source
DS_TYPE_HDFS = 'hdfs'
DS_HDFS_KEYS = ['defaultFS']
DS_HDFS_SECTION_HADOOP_CONFIG = 'hadoop_config'
DS_HDFS_PARAMETER_HADOOP_CONFIG = 'hadoopConfig'


class HDFSDataSource(DataSource):
    def __init__(self, ds_file: str):
        super(HDFSDataSource, self).__init__(ds_file)
        self.source_type = DS_TYPE_HDFS
        self.keys = DS_HDFS_KEYS

    def get_datasource_dict(self) -> Dict[str, str]:
        ds_dict = super(HDFSDataSource, self).get_datasource_dict()
        # HA 集群下，运维把 hdfs-site.xml 里的 HA keys 原样写进 [hadoop_config] 节；
        # DataX JVM 不读 HADOOP_CONF_DIR，必须靠 hadoopConfig 块注入才能解析 nameservice
        if self.config_parser.has_section(DS_HDFS_SECTION_HADOOP_CONFIG):
            ds_dict[DS_HDFS_PARAMETER_HADOOP_CONFIG] = dict(
                self.config_parser.items(DS_HDFS_SECTION_HADOOP_CONFIG)
            )
        return ds_dict

    @staticmethod
    def generate_definition(default_fs: str) -> str:
        lines = [
            '[base]',
            'defaultFS = %s' % default_fs
        ]
        return '\n'.join(lines)