#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import sys
import copy
import time
import _thread
import argparse
import compileall
from Utils import Constant
from Utils.Exception import checkException


def mainArgParse(rawArgs: list) -> argparse.Namespace:
    mainParser = argparse.ArgumentParser(description = 'Start running API server')
    mainParser.add_argument('--log', type = str, default = Constant.LogLevel, help = 'output log level')
    mainParser.add_argument('--dns', type = str, default = Constant.DnsServer, nargs = '+', help = 'specify dns server')
    mainParser.add_argument('--port', type = int, default = Constant.ApiPort, help = 'port for running')
    mainParser.add_argument('--path', type = str, default = Constant.ApiPath, help = 'root path for api server')
    mainParser.add_argument('--token', type = str, default = Constant.ApiToken, help = 'token for api server')
    mainParser.add_argument('--thread', type = int, default = Constant.CheckThread, help = 'number of check thread')
    mainParser.add_argument('-v', '--version', help = 'show version', action = 'store_true')
    return mainParser.parse_args(rawArgs)


def testArgParse(rawArgs: list) -> argparse.Namespace:
    testParser = argparse.ArgumentParser(description = 'Test that each function is working properly')
    testParser.add_argument('PROTOCOL', type = str, help = 'test protocol name')
    testParser.add_argument('-a', '--all', help = 'test extra shadowsocks items', action = 'store_true')
    testParser.add_argument('-6', '--ipv6', help = 'test on ipv6 network', action = 'store_true')
    testParser.add_argument('--debug', help = 'enable debug log level', action = 'store_true')
    testParser.add_argument('--url', type = str, default = 'http://baidu.com', help = 'http request url')
    testParser.add_argument('--cert', type = str, default = '', help = 'specify the certificate id')
    testParser.add_argument('--thread', type = int, default = 16, help = 'thread number in check process')
    testParser.add_argument('--select', type = str, nargs = '+', help = 'select id list for test')
    return testParser.parse_args(rawArgs)


testArgs = None
testMode = False
inputArgs = copy.copy(sys.argv)
if len(inputArgs) >= 0:  # remove first arg (normally file name)
    inputArgs.pop(0)
if len(inputArgs) != 0 and inputArgs[0].lower() == 'test':  # test mode
    inputArgs.pop(0)  # remove `test`
    if len(inputArgs) == 0 or inputArgs[0].startswith('-'):  # no protocol is specified
        inputArgs = ['all'] + inputArgs
    testArgs = testArgParse(inputArgs)
    Constant.LogLevel = 'debug' if testArgs.debug else 'warning'
    testMode = True
else:
    mainArgs = mainArgParse(inputArgs)
    if mainArgs.version:  # output version and exit
        print('ProxyC version -> %s' % Constant.Version)
        sys.exit(0)
    Constant.LogLevel = mainArgs.log  # overwrite global options
    Constant.DnsServer = mainArgs.dns
    Constant.ApiPort = mainArgs.port
    Constant.ApiPath = mainArgs.path
    Constant.ApiToken = mainArgs.token
    Constant.CheckThread = mainArgs.thread


from Tester import testEntry
from Utils.Check import Check
from Utils import Api, DnsProxy
from Utils.Logger import logger
from Utils.Manager import Manager
from Utils.Test import Test, loadBind, loadCert
from concurrent.futures import ThreadPoolExecutor


def pythonCompile(dirRange: str = '/') -> None:  # python optimize compile
    for optimize in [-1, 1, 2]:
        compileall.compile_dir(dirRange, quiet = 1, optimize = optimize)
        logger.warning('Python optimize compile -> %s (level = %i)' % (dirRange, optimize))


def runCheck(taskId: str, taskInfo: dict) -> None:
    success = True
    checkResult = {}
    try:
        checkResult = Check(taskId, taskInfo)  # check by task info
        logger.warning('[%s] Task finish' % taskId)
    except checkException as exp:
        success = False
        logger.error('[%s] Task error -> %s' % (taskId, exp))
    except:
        success = False
        logger.error('[%s] Task error -> Unknown error' % taskId)
    finally:
        if not success:  # got some error in check process
            taskInfo.pop('check')
            checkResult = {
                **taskInfo,
                'success': False,
            }
        Manager.finishTask(taskId, checkResult)  # commit check result


def loop(threadNum: int) -> None:
    logger.warning('Loop check start -> %i threads' % threadNum)
    threadPool = ThreadPoolExecutor(max_workers = threadNum)  # init thread pool
    while True:
        try:
            taskId, taskInfo = Manager.popTask()  # pop a task
            logger.warning('[%s] Load new task' % taskId)
        except:  # no more task
            time.sleep(2)
            continue
        threadPool.submit(runCheck, taskId, taskInfo)  # submit into thread pool


if testMode:  # test mode
    loadBind(serverV6 = testArgs.ipv6, clientV6 = testArgs.ipv6)  # ipv4 / ipv6 (127.0.0.1 / ::1)
    loadCert(certId = testArgs.cert)  # cert config
    logger.critical('TEST ITEM: %s' % testArgs.PROTOCOL)
    logger.critical('SELECT: ' + str(testArgs.select))
    logger.critical('URL: %s' % testArgs.url)
    logger.critical('THREAD NUMBER: %i' % testArgs.thread)
    logger.critical('-' * 32 + ' TEST START ' + '-' * 32)
    if testArgs.PROTOCOL == 'all':  # run all test items
        for item in testEntry:
            if item == ('ss' if testArgs.all else 'ss-all'):  # skip ss / ss-all
                continue
            logger.critical('TEST ITEM -> ' + item)
            Test(testEntry[item], testArgs.thread, testArgs.url, testArgs.select)
    else:  # run single item
        if testArgs.PROTOCOL == 'ss' and testArgs.all:  # test shadowsocks extra items
            testItem = 'ss-all'
        Test(testEntry[testArgs.PROTOCOL], testArgs.thread, testArgs.url, testArgs.select)
    logger.critical('-' * 32 + ' TEST COMPLETE ' + '-' * 32)
    sys.exit(0)  # test complete


logger.warning('ProxyC starts running (%s)' % Constant.Version)
_thread.start_new_thread(pythonCompile, ('/usr',))  # python compile (generate .pyc file)
_thread.start_new_thread(DnsProxy.start, (Constant.DnsServer, 53))  # start dns server
_thread.start_new_thread(loop, (Constant.CheckThread, ))  # start check loop
Api.startServer()  # start api server