'''
执行数据库操作的线程
'''

import threading
import queue
import time
from sshtunnel import SSHTunnelForwarder, BaseSSHTunnelForwarderError
import pymysql
from DBUtils.PooledDB import PooledDB
from concurrent.futures import ThreadPoolExecutor

import json
import shutil

import common.sys_comm
from common.sys_comm import LOGDBG, LOGINFO, LOGWARN, LOGERR
from common.sys_comm import get_bj_time_ms
from common.sys_comm import g_sys_conf, g_sys_conf_mtx


# ssh配置
ssh_conf = {
    "ssh_host": "119.45.12.173",
    "ssh_port": 22,
    "ssh_user": "root",
    "ssh_pwd": "Hfln@667788",

}

# 数据库配置
db_config = {
    # 数据库相关参数
    "host": "localhost",
    "user": "root",
    "password": "Hfln@1024",
    "database": "lnxx_dev"
}


# 请求队列
db_req_que = queue.Queue()
# 记录 SSH 隧道和数据库连接
ssh_server = None
# 连接池对象
db_pool = None

# 数据库请求类
class DBRequest:
    def __init__(self, sql:str, params=None, callback=None, userdata=None):
        self.sql = sql
        self.params = params if params else ()
        self.callback = callback
        self.userdata = userdata


# ========== 初始化配置 ==========
def db_pro_init():
    global ssh_conf, db_config
    with g_sys_conf_mtx:
        ssh_conf = {
            "ssh_host": g_sys_conf["ssh_host"],
            "ssh_port": g_sys_conf["ssh_port"],
            "ssh_user": g_sys_conf["ssh_username"],
            "ssh_pwd": g_sys_conf["ssh_password"],
        }

        db_config = {
            "host": g_sys_conf["db_host"],
            "user": g_sys_conf["db_username"],
            "password": g_sys_conf["db_password"],
            "database": "lnxx_dev"
        }


# ========== 初始化 SSH ==========
def initialize_ssh_connection():
    global ssh_server
    if ssh_server is None or not ssh_server.is_active:
        ssh_server = SSHTunnelForwarder(
            (ssh_conf["ssh_host"], ssh_conf["ssh_port"]),
            ssh_username=ssh_conf["ssh_user"],
            ssh_password=ssh_conf["ssh_pwd"],
            remote_bind_address=('127.0.0.1', 3306)
        )
        ssh_server.start()
        LOGINFO("SSH connected")


# ========== 初始化连接池 ==========
def initialize_connection_pool():
    global db_pool, ssh_server
    if g_sys_conf["platform"] == 0:
        initialize_ssh_connection()
        port = ssh_server.local_bind_port
        host = "127.0.0.1"
    else:
        port = 3306
        host = db_config["host"]

    db_pool = PooledDB(
        creator=pymysql,
        maxconnections=10,
        mincached=2,
        maxcached=5,
        blocking=True,
        host=host,
        port=port,
        user=db_config['user'],
        password=db_config['password'],
        database=db_config['database'],
        charset='utf8mb4',
        cursorclass=pymysql.cursors.DictCursor
    )
    LOGINFO("DB connection pool initialized")


# ========== 执行数据库请求 ==========
def handle_db_request(db_request: DBRequest):
    conn = None
    try:
        conn = db_pool.connection()
        with conn.cursor() as cursor:
            cursor.execute(db_request.sql, db_request.params)
            sql_lower = db_request.sql.strip().lower()
            if sql_lower.startswith("select"):
                result = cursor.fetchall()
            elif sql_lower.startswith("insert"):
                result = {"lastrowid": cursor.lastrowid}
            else:
                result = {"rowcount": cursor.rowcount}
            if db_request.callback:
                db_request.callback(result, db_request.userdata)
        conn.commit()
    except Exception as e:
        LOGERR(f"[DB ERROR] SQL执行失败: {e}")
    finally:
        if conn:
            conn.close()
        db_req_que.task_done()


# ========== 主数据库线程 ==========
def db_process():
    db_pro_init()
    initialize_connection_pool()

    executor = ThreadPoolExecutor(max_workers=8)  # 限制线程并发数
    while True:
        try:
            db_request: DBRequest = db_req_que.get()
            if db_request is None:
                break
            executor.submit(handle_db_request, db_request)
        except Exception as e:
            LOGERR(f"[DB Thread Error] {e}")
        time.sleep(0.01)


def create_db_process():
    # 启动数据库线程
    return threading.Thread(target=db_process, daemon=True)


# 处理数据库返回的结果
def handle_device_data(results, userdata):
    LOGDBG("Received results: {results}")


# 示例请求生成器
def request_generator():
    while True:
        sql_query = "SELECT * FROM dev_info"  # 示例查询
        db_req_que.put(DBRequest(sql=sql_query, callback=handle_device_data))
        time.sleep(1)  # 每秒生成一个请求


def test_main():
    # 启动数据库线程
    db_thread = threading.Thread(target=db_process, daemon=True)
    db_thread.start()

    # 启动请求生成器
    request_gen_thread = threading.Thread(target=request_generator)
    request_gen_thread.start()