import inspect
import string

import os
import re
import sys

abspath = os.path.abspath(__file__)
root_path = re.sub(r"tendata-warehouse.*", "tendata-warehouse", abspath)
sys.path.append(root_path)

from importlib import import_module
from pyspark.sql import SparkSession
from dw_base.spark.udf.spark_common_udf import *

def read_file(file_path:str)->(list,str):
    module_list = []
    sql_list = []
    with open(file_path, 'r') as file:
        for line in file:
            if line.strip().startswith("ADD FILE"):
                module = line.strip()[len("ADD FILE"):].split('.')[0].replace("/",".")
                print(f'将要导入的模块为: {module}')
                module_list.append(module.strip())
            elif line.strip().startswith("--"):
                continue
            else:
                sql_list.append(line)
    sql = " ".join(sql_list)
    return module_list,sql

def register_udf(spark:SparkSession,udf_files:list):
    for f in udf_files:
        module = import_module(f)
        for name,value in inspect.getmembers(module):
            if inspect.isfunction(value):
                print(f'registing udf --> name is :{name} , value is :{value}')
                # spark.sparkContext.addPyFile("dw_base/spark/udf/spark_json_array_udf.py")
                spark.udf.register(name,value)


def generate_random_string(length):
    # 生成包含大小写字母和数字的字符集
    characters = string.ascii_letters + string.digits
    # 生成指定长度的随机字符串
    random_string = ''.join(random.choice(characters) for i in range(length))
    return random_string


class Hive2ExcelUtil:
    def __init__(self):
        base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
        self.BASE_DIR = os.path.dirname(base_dir)
        self.spark = SparkSession.builder \
        .appName("HiveToExcel") \
        .master("local[4]") \
        .config('hive.exec.orc.default.block.size', 134217728) \
        .config('spark.debug.maxToStringFields', 5000) \
        .config('spark.dynamicAllocation.enabled', False) \
        .config('spark.files.ignoreCorruptFiles', True) \
        .config('spark.sql.adaptive.enabled', 'true') \
        .config('spark.sql.broadcastTimeout', -1) \
        .config('spark.sql.codegen.wholeStage', 'false') \
        .config('spark.sql.execution.arrow.enabled', True) \
        .config('spark.sql.execution.arrow.fallback.enabled', True) \
        .config('spark.sql.files.ignoreCorruptFiles', True) \
        .config('spark.sql.statistics.fallBackToHdfs', True) \
        .config('spark.sql.execution.arrow.enabled', False) \
        .config('spark.yarn.queue', "default") \
        .enableHiveSupport().getOrCreate()

    def transfer(self,excel_position: str, sql_file_position: str):
        excel_full_path = excel_position
        sql_full_path = sql_file_position
        if not excel_position.startswith("/"):
            excel_full_path = os.path.join(self.BASE_DIR, excel_position)
        print(f'生成的excel文件位置在: {excel_full_path}')
        if not sql_file_position.startswith("/"):
            sql_full_path = os.path.join(self.BASE_DIR, sql_file_position)
        print(f'生成的excel文件位置在: {sql_full_path}')
        module_list,sql = read_file(sql_full_path)
        print(f"正在执行的sql为: {sql}")
        register_udf(self.spark,module_list)
        pd_df = self.spark.sql(sql).toPandas()
        pd_df.to_excel(excel_full_path, index=False)


if __name__ == '__main__':
    sql_file_position_input = input("请输入你的sql文件相对路径或绝对路径：")
    sql_file_position = sql_file_position_input.strip()


    excel_position_input = input("请输入你要生成的excel文件的相对路径或绝对路径：")
    excel_position = excel_position_input.strip()
    if excel_position.endswith("/"):
        excel_position = f'{excel_position}{generate_random_string(10)}_output.xlsx'
    else:
        excel_path_name = excel_position.split(".")[0]
        excel_position = f'{excel_path_name}.xlsx'

    Hive2ExcelUtil().transfer(excel_position,sql_file_position)
    print("=================transfer completed!=======================")