from abc import ABC
from time import time, sleep
from requests import get
from traceback import format_exc
from shutil import copytree
from os.path import isdir, join
from os import mkdir, walk, rename
from re import sub, search, MULTILINE
from subprocess import run
from logger import log
from string import ascii_lowercase, digits
from random import choice
from ssl import SSLContext, create_connection
import OpenSSL.crypto as crypto
from urllib.parse import urlparse


class Test(ABC):
    def __init__(self, name, kind, timeout, tests, no_copy_container=False, delay=0):
        self._name = name
        self.__kind = kind
        self._timeout = timeout
        self.__tests = tests
        self._no_copy_container = no_copy_container
        self.__delay = delay
        self._domains = {}
        log(
            "TEST",
            "ℹ️",
            f"instiantiated with {len(tests)} tests and timeout of {timeout}s for {self._name}",
        )

    # called once before running all the different tests for a given integration
    @staticmethod
    def init():
        try:
            if not isdir("/tmp/bw-data"):
                mkdir("/tmp/bw-data")
            run("sudo chmod 777 /tmp/bw-data", shell=True)
            rm_dirs = ["configs", "plugins", "www"]
            for rm_dir in rm_dirs:
                if isdir(rm_dir):
                    run(f"sudo rm -rf /tmp/bw-data/{rm_dir}", shell=True)
            if not isdir("/tmp/tests"):
                mkdir("/tmp/tests")
        except:
            log("TEST", "❌", f"exception while running Test.init()\n{format_exc()}")
            return False
        return True

    # Class method
    @staticmethod
    def end():
        return True

    # helper to check domains
    def _check_domains(self):
        for k, v in self._domains.items():
            if v is None:
                log("TEST", "⚠️", f"env {k} is None")

    # called before starting the tests
    # must be override if specific actions needs to be done
    def _setup_test(self):
        try:
            rm_dirs = ["configs", "plugins", "www"]
            for rm_dir in rm_dirs:
                if isdir(f"/tmp/bw-data/{rm_dir}"):
                    run(
                        f"sudo bash -c 'rm -rf /tmp/bw-data/{rm_dir}/*'",
                        shell=True,
                    )
            if isdir(f"/tmp/tests/{self._name}"):
                run(f"sudo rm -rf /tmp/tests/{self._name}", shell=True)
            copytree(f"./examples/{self._name}", f"/tmp/tests/{self._name}")
        except:
            log(
                "TEST",
                "❌",
                f"exception while running Test._setup_test()\n{format_exc()}",
            )
            return False
        return True

    # called after running the tests
    def _cleanup_test(self):
        try:
            run(f"sudo rm -rf /tmp/tests/{self._name}", shell=True)
        except:
            log(
                "TEST",
                "❌",
                f"exception while running Test._cleanup_test()\n{format_exc()}",
            )
            return False
        return True

    # run all the tests
    def run_tests(self):
        if not self._setup_test():
            self._debug_fail()
            return False
        if self.__delay != 0:
            log("TEST", "ℹ️", f"delay is set, sleeping {self.__delay}s")
            sleep(self.__delay)
        start = time()
        while time() < start + self._timeout:
            all_ok = True
            for test in self.__tests:
                ok = self.__run_test(test)
                sleep(1)
                if not ok:
                    all_ok = False
                    break
            if all_ok:
                elapsed = str(int(time() - start))
                log(
                    "TEST",
                    "ℹ️",
                    f"success ({elapsed}/{self._timeout}s)",
                )
                return self._cleanup_test()
            log("TEST", "⚠️", "tests not ok, retrying in 1s ...")
        self._debug_fail()
        self._cleanup_test()
        log("TEST", "❌", f"failed (timeout = {self._timeout}s)")
        return False

    # run a single test
    def __run_test(self, test):
        try:
            ok = False
            ex_url = test["url"]
            for ex_domain, test_domain in self._domains.items():
                if search(ex_domain, ex_url):
                    ex_url = sub(ex_domain, test_domain, ex_url)
                    break
            if test["type"] == "string":
                r = get(ex_url, timeout=10, verify=False)
                ok = test["string"].casefold() in r.text.casefold()
                if not ok:
                    log("TEST", "⚠️", f"String not found : {test['string'].casefold()}")
            elif test["type"] == "status":
                r = get(ex_url, timeout=10, verify=False)
                ok = test["status"] == r.status_code
                if not ok:
                    log("TEST", "⚠️", f"Wrong status code : {str(r.status_code)}")
            if ok and "tls" in test:
                ex_tls = test["tls"]
                tls_edit = True
                if "tls_edit" in test:
                    tls_edit = test["tls_edit"]
                if tls_edit:
                    for ex_domain, test_domain in self._domains.items():
                        if search(ex_domain, ex_tls):
                            ex_tls = sub(ex_domain, test_domain, ex_tls)
                connection = create_connection((urlparse(ex_url).netloc, 443))
                context = SSLContext()
                sock = context.wrap_socket(connection, server_hostname=urlparse(ex_url).netloc)
                cert = sock.getpeercert(True)
                sock.close()
                x509 = crypto.load_certificate(crypto.FILETYPE_ASN1, cert)
                if x509.get_subject().CN != ex_tls:
                    ok = False
                    log("TEST", "⚠️", f"wrong cert CN : {x509.get_subject().CN} != {ex_tls}")
            return ok
        except:
            log("TEST", "⚠️", f"Exception : {format_exc()}")
            return False
        raise (Exception(f"unknown test type {test['type']}"))

    # called when tests fail : typical case is to show logs
    def _debug_fail(self):
        pass

    @staticmethod
    def replace_in_file(path, old, new):
        try:
            with open(path, "r") as f:
                content = f.read()
            content = sub(old, new, content, flags=MULTILINE)
            with open(path, "w") as f:
                f.write(content)
        except:
            log("TEST", "⚠️", f"can't replace file {path} : {format_exc()}")

    @staticmethod
    def replace_in_files(path, old, new):
        for root, dirs, files in walk(path):
            for name in files:
                Test.replace_in_file(join(root, name), old, new)

    @staticmethod
    def rename(path, old, new):
        for root, dirs, files in walk(path):
            for name in dirs + files:
                full_path = join(root, name)
                new_path = sub(old, new, full_path)
                if full_path != new_path:
                    rename(full_path, new_path)

    @staticmethod
    def random_string(length):
        charset = ascii_lowercase + digits
        return "".join(choice(charset) for i in range(length))