# -*- coding: utf-8 -*-
# 内部数据库同步数据脚本, 用于同一台服务器, 将mongodb数据同步到pgsql
from datetime import datetime
from pymongo import MongoClient
import psycopg2
from psycopg2 import sql

MONGOLINK = 'mongodb://root:aaaAAA111!!!@erhe.top:38000/'
PGSQLPARAMS = {
    # 'database': 'postgres',  # 默认连接到postgres数据库，超级用户数据库
    'user': 'toor',
    'password': 'aaaAAA111',  # 替换为你的密码
    'host': '192.168.31.177',
    'port': 5432
}


def mongo():
    # mongodb
    client = MongoClient(MONGOLINK)

    # 指定数据库名称
    db_name = 'NEWS'  # 替换为你的数据库名称

    # 选择数据库
    db = client[db_name]

    # 列出数据库中的所有集合
    collections = db.list_collection_names()

    all_data = []

    for collection_name in collections:
        # 选择集合
        collection = db[collection_name]

        # 读取集合中的所有数据
        for document in collection.find({}, {'_id': 0}):
            all_data.append(document)

    sorted_data = []

    if all_data:
        sorted_data = sorted(all_data, key=lambda x: x['create_time'], reverse=True)

    return sorted_data


def pg(sorted_data):
    table_name = 'auto'
    PGSQLPARAMS.update({'database': table_name})
    conn = psycopg2.connect(**PGSQLPARAMS)

    # 记录相同数据, 如果查过指定数量, 则退出程序, 避免浪费资源
    same_data = 500
    for doc in sorted_data:
        if same_data > 0:
            try:
                cur = conn.cursor()

                create_time_dt = None
                if doc.get('create_time'):
                    create_time_dt = datetime.utcfromtimestamp(doc['create_time'])

                values = {
                    'name': doc.get('title'),
                    'context': doc.get('context') or '',
                    'source_url': doc.get('source_url') or '',
                    'link': doc.get('line') or '',
                    'article_type': doc.get('article_type') or '',
                    'article_source': doc.get('article_source') or '',
                    'img_url': doc.get('img_url') or '',
                    'keyword': doc.get('keyword') or '',
                    'posted_date': doc.get('posted_date') or '',
                    'create_time_ts': doc.get('create_time') or '',
                    'create_time': create_time_dt,
                    'create_datetime': datetime.strptime(doc['create_datetime'], '%Y-%m-%d %H:%M:%S') if doc.get(
                        'create_datetime') else None
                }

                # 将create_time转换为适合数据库的时间戳格式
                create_time_dt = datetime.utcfromtimestamp(values['create_time_ts']) if values[
                    'create_time_ts'] else None
                values['create_time'] = create_time_dt

                # 将create_datetime转换为适合数据库的时间戳格式
                create_datetime_str = doc.get('create_datetime')
                values['create_datetime'] = datetime.strptime(create_datetime_str,
                                                              '%Y-%m-%d %H:%M:%S') if create_datetime_str else None

                # 检查数据库中是否已存在相同title的记录
                check_query = "SELECT id FROM news_info WHERE name = %s;"
                cur.execute(check_query, (values['name'],))

                # 如果没有找到记录，则插入新记录
                if not cur.fetchone():
                    insert_query = """
                        INSERT INTO news_info (name, context, source_url, link, article_type, article_source, img_url, keyword, posted_date, create_time, create_datetime)
                        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
                        """
                    cur.execute(insert_query, (
                        values['name'],
                        values['context'],
                        values['source_url'],
                        values['link'],
                        values['article_type'],
                        values['article_source'],
                        values['img_url'],
                        values['keyword'],
                        values['posted_date'],
                        values['create_time'],
                        values['create_datetime']
                    ))
                    conn.commit()
                    print(f'已保存{values}')
                else:
                    same_data -= 1
            except Exception as e:
                print("Error during search: ", e)
            finally:
                # 关闭游标和连接
                if 'cur' in locals():
                    cur.close()
        else:
            print('相同数据计数已到最大值, 退出程序')
            break
    conn.close()


def create_db():
    db_name = 'postgres'

    PGSQLPARAMS.update({'database': db_name})
    # 连接到数据库
    conn = psycopg2.connect(**PGSQLPARAMS)
    conn.autocommit = True  # 确保创建数据库的命令可以立即执行

    # 创建一个cursor对象
    cur = conn.cursor()

    # 要创建的数据库名
    new_db = 'auto'
    # 数据库所有者
    owner = 'toor'

    try:
        # 检查数据库是否存在
        cur.execute(sql.SQL("SELECT 1 FROM pg_catalog.pg_database WHERE datname = %s"), (new_db,))
        exists = cur.fetchone()
        if not exists:
            # 如果数据库不存在，创建它
            cur.execute(sql.SQL("CREATE DATABASE {} WITH OWNER {} ENCODING 'UTF8'").format(
                sql.Identifier(new_db),
                sql.Identifier(owner)
            ))
            print(f"Database '{new_db}' created successfully.")
        else:
            print(f"Database '{new_db}' already exists.")
    except Exception as e:
        print(f"An error occurred: {e}")
    finally:
        # 关闭cursor和连接
        cur.close()
        conn.close()


def create_table():
    db_name = 'auto'

    PGSQLPARAMS.update({'database': db_name})

    # 创建数据库连接
    conn = psycopg2.connect(**PGSQLPARAMS)

    # 创建一个 cursor 对象
    cur = conn.cursor()

    # 定义表结构的 SQL 语句
    create_table_sql = """
    CREATE TABLE IF NOT EXISTS news_info (
        id SERIAL PRIMARY KEY,
        name VARCHAR(255) NOT NULL,
        context TEXT,
        source_url VARCHAR(255),
        link VARCHAR(255),
        article_type VARCHAR(50),
        article_source VARCHAR(50),
        img_url VARCHAR(255),
        keyword VARCHAR(255),
        posted_date VARCHAR,
        create_time_ts BIGINT,
        create_time TIMESTAMP WITHOUT TIME ZONE DEFAULT CURRENT_TIMESTAMP,
        create_datetime TIMESTAMP WITHOUT TIME ZONE DEFAULT CURRENT_TIMESTAMP
    );
    """

    try:
        # 执行 SQL 语句来创建表
        cur.execute(create_table_sql)
        conn.commit()  # 提交事务
        print("Table 'auto' created successfully.")
    except Exception as e:
        print(f"An error occurred while creating table: {e}")
        conn.rollback()  # 发生错误时回滚事务
    finally:
        # 关闭 cursor 和连接
        cur.close()
        conn.close()


if __name__ == '__main__':
    create_db()
    create_table()

    sorted_data = mongo()
    if sorted_data:
        pg(sorted_data)

    print("Done!")