import os
import socket
import fnmatch
import subprocess
import multiprocessing
import json
import docker
import time
import traceback
from threading import Thread

from toolset.utils.output_helper import log, log_error, FNULL
from toolset.utils.metadata_helper import gather_tests
from toolset.utils.ordered_set import OrderedSet
from toolset.utils.database_helper import test_database


def clean(config):
    '''
    Cleans all the docker images from the system
    '''
    # Clean the app server images
    subprocess.check_call(["docker", "image", "prune", "-f"])

    docker_ids = subprocess.check_output(["docker", "images",
                                          "-q"]).splitlines()
    for docker_id in docker_ids:
        subprocess.check_call(["docker", "image", "rmi", "-f", docker_id])

    subprocess.check_call(["docker", "system", "prune", "-a", "-f"])

    # Clean the database server images
    command = list(config.database_ssh_command)
    command.extend(["docker", "image", "prune", "-f"])
    subprocess.check_call(command)

    command = list(config.database_ssh_command)
    command.extend(["docker", "images", "-q"])
    docker_ids = subprocess.check_output(command).splitlines()

    for docker_id in docker_ids:
        command = list(config.database_ssh_command)
        command.extend(["docker", "image", "rmi", "-f", docker_id])
        subprocess.check_call(command)

    command = list(config.database_ssh_command)
    command.extend(["docker", "system", "prune", "-a", "-f"])
    subprocess.check_call(command)


def build(benchmarker_config, test_names, build_log_dir=os.devnull):
    '''
    Builds the dependency chain as well as the test implementation docker images
    for the given tests.
    '''
    tests = gather_tests(test_names)

    for test in tests:
        log_prefix = "%s: " % test.name

        docker_buildargs = {
            'CPU_COUNT': str(multiprocessing.cpu_count()),
            'MAX_CONCURRENCY': str(max(benchmarker_config.concurrency_levels)),
            'TFB_DATABASE': str(benchmarker_config.database_host)
        }

        test_docker_files = ["%s.dockerfile" % test.name]
        if test.docker_files is not None:
            if type(test.docker_files) is list:
                test_docker_files.extend(test.docker_files)
            else:
                raise Exception(
                    "docker_files in benchmark_config.json must be an array")

        for test_docker_file in test_docker_files:
            deps = OrderedSet(
                list(
                    reversed(
                        __gather_dependencies(
                            os.path.join(test.directory, test_docker_file)))))

            docker_dir = os.path.join(
                os.getenv('FWROOT'), "toolset", "setup", "docker")
            for dependency in deps:
                build_log_file = build_log_dir
                if build_log_dir is not os.devnull:
                    build_log_file = os.path.join(
                        build_log_dir, "%s.log" % dependency.lower())
                with open(build_log_file, 'w') as build_log:
                    docker_file = os.path.join(test.directory,
                                               dependency + ".dockerfile")
                    if not docker_file or not os.path.exists(docker_file):
                        docker_file = find(docker_dir,
                                           dependency + ".dockerfile")
                    if not docker_file:
                        log("Docker build failed; %s could not be found; terminating"
                            % (dependency + ".dockerfile"), log_prefix,
                            build_log)
                        return 1

                    # Build the dependency image
                    try:
                        for line in docker.APIClient(
                                base_url='unix://var/run/docker.sock').build(
                                    path=os.path.dirname(docker_file),
                                    dockerfile="%s.dockerfile" % dependency,
                                    tag="tfb/%s" % dependency,
                                    buildargs=docker_buildargs,
                                    forcerm=True):
                            if line.startswith('{"stream":'):
                                line = json.loads(line)
                                line = line[line.keys()[0]].encode('utf-8')
                                log(line, log_prefix, build_log)
                    except Exception:
                        tb = traceback.format_exc()
                        log("Docker dependency build failed; terminating",
                            log_prefix, build_log)
                        log_error(tb, log_prefix, build_log)
                        return 1

        # Build the test images
        for test_docker_file in test_docker_files:
            build_log_file = build_log_dir
            if build_log_dir is not os.devnull:
                build_log_file = os.path.join(
                    build_log_dir, "%s.log" % test_docker_file.replace(
                        ".dockerfile", "").lower())
            with open(build_log_file, 'w') as build_log:
                try:
                    for line in docker.APIClient(
                            base_url='unix://var/run/docker.sock').build(
                                path=test.directory,
                                dockerfile=test_docker_file,
                                tag="tfb/test/%s" % test_docker_file.replace(
                                    ".dockerfile", ""),
                                buildargs=docker_buildargs,
                                forcerm=True):
                        if line.startswith('{"stream":'):
                            line = json.loads(line)
                            line = line[line.keys()[0]].encode('utf-8')
                            log(line, log_prefix, build_log)
                except Exception:
                    tb = traceback.format_exc()
                    log("Docker build failed; terminating", log_prefix,
                        build_log)
                    log_error(tb, log_prefix, build_log)
                    return 1

    return 0


def run(benchmarker_config, docker_files, run_log_dir):
    '''
    Run the given Docker container(s)
    '''
    client = docker.from_env()

    for docker_file in docker_files:
        log_prefix = "%s: " % docker_file.replace(".dockerfile", "")
        try:

            def watch_container(container, docker_file):
                with open(
                        os.path.join(
                            run_log_dir, "%s.log" % docker_file.replace(
                                ".dockerfile", "").lower()), 'w') as run_log:
                    for line in container.logs(stream=True):
                        log(line, log_prefix, run_log)

            extra_hosts = {
                socket.gethostname(): str(benchmarker_config.server_host),
                'TFB-SERVER': str(benchmarker_config.server_host),
                'TFB-DATABASE': str(benchmarker_config.database_host),
                'TFB-CLIENT': str(benchmarker_config.client_host)
            }

            container = client.containers.run(
                "tfb/test/%s" % docker_file.replace(".dockerfile", ""),
                network_mode="host",
                privileged=True,
                stderr=True,
                detach=True,
                init=True,
                extra_hosts=extra_hosts)

            watch_thread = Thread(
                target=watch_container, args=(
                    container,
                    docker_file,
                ))
            watch_thread.daemon = True
            watch_thread.start()

        except Exception:
            with open(
                    os.path.join(run_log_dir, "%s.log" % docker_file.replace(
                        ".dockerfile", "").lower()), 'w') as run_log:
                tb = traceback.format_exc()
                log("Running docker cointainer: %s failed" % docker_file,
                    log_prefix, run_log)
                log_error(tb, log_prefix, run_log)
                return 1

    return 0


def successfully_running_containers(docker_files, out):
    '''
    Returns whether all the expected containers for the given docker_files are
    running.
    '''
    client = docker.from_env()
    expected_running_container_images = []
    for docker_file in docker_files:
        # 'gemini.dockerfile' -> 'gemini'
        image_tag = docker_file.split('.')[0]
        expected_running_container_images.append(image_tag)
    running_container_images = []
    for container in client.containers.list():
        # 'tfb/test/gemini:latest' -> 'gemini'
        image_tag = container.image.tags[0].split(':')[0][9:]
        running_container_images.append(image_tag)

    for image_name in expected_running_container_images:
        if image_name not in running_container_images:
            log_prefix = "%s: " % image_name
            log("ERROR: Expected tfb/test/%s to be running container" %
                image_name, log_prefix, out)
            return False
    return True


def stop(config=None, database_container_id=None, test=None):
    '''
    Attempts to stop the running test container.
    '''
    client = docker.from_env()
    # Stop all the containers
    for container in client.containers.list():
        if container.status == "running" and container.id != database_container_id:
            container.stop()
    # Remove only the tfb/test image for this test
    try:
        client.images.remove("tfb/test/%s" % test.name, force=True)
    except:
        # This can be okay if the user hit ctrl+c before the image built/ran
        pass
    # Stop the database container
    if database_container_id:
        command = list(config.database_ssh_command)
        command.extend(['docker', 'stop', database_container_id])
        subprocess.check_call(command, stdout=FNULL, stderr=subprocess.STDOUT)
    client.images.prune()
    client.containers.prune()
    client.networks.prune()
    client.volumes.prune()


def find(path, pattern):
    '''
    Finds and returns all the the files matching the given pattern recursively in
    the given path. 
    '''
    for root, dirs, files in os.walk(path):
        for name in files:
            if fnmatch.fnmatch(name, pattern):
                return os.path.join(root, name)


def start_database(config, database):
    '''
    Sets up a container for the given database and port, and starts said docker 
    container.
    '''

    def __is_hex(s):
        try:
            int(s, 16)
        except ValueError:
            return False
        return len(s) % 2 == 0

    command = list(config.database_ssh_command)
    command.extend(['docker', 'images', '-q', database])
    out = subprocess.check_output(command)
    dbid = ''
    if len(out.splitlines()) > 0:
        dbid = out.splitlines()[len(out.splitlines()) - 1]

    # If the database image exists, then dbid will look like
    # fe12ca519b47, and we do not want to rebuild if it exists
    if len(dbid) != 12 and not __is_hex(dbid):

        def __scp_command(files):
            scpstr = ["scp", "-i", config.database_identity_file]
            for file in files:
                scpstr.append(file)
            scpstr.append("%s@%s:~/%s/" % (config.database_user,
                                           config.database_host, database))
            return scpstr

        command = list(config.database_ssh_command)
        command.extend(['mkdir', '-p', database])
        subprocess.check_call(command)
        dbpath = os.path.join(config.fwroot, "toolset", "setup", "docker",
                              "databases", database)
        dbfiles = ""
        for dbfile in os.listdir(dbpath):
            dbfiles += "%s " % os.path.join(dbpath, dbfile)
        subprocess.check_call(__scp_command(dbfiles.split()))

        command = list(config.database_ssh_command)
        command.extend([
            'docker', 'build', '-f',
            '~/%s/%s.dockerfile' % (database, database), '-t', database,
            '~/%s' % database
        ])
        subprocess.check_call(command)

    command = list(config.database_ssh_command)
    command.extend(
        ['docker', 'run', '-d', '--rm', '--init', '--network=host', database])
    docker_id = subprocess.check_output(command).strip()

    # Sleep until the database accepts connections
    slept = 0
    max_sleep = 60
    while not test_database(config, database) and slept < max_sleep:
        time.sleep(1)
        slept += 1

    return docker_id


def __gather_dependencies(docker_file):
    '''
    Gathers all the known docker dependencies for the given docker image.
    '''
    deps = []

    docker_dir = os.path.join(
        os.getenv('FWROOT'), "toolset", "setup", "docker")

    if os.path.exists(docker_file):
        with open(docker_file) as fp:
            for line in fp.readlines():
                tokens = line.strip().split(' ')
                if tokens[0] == "FROM":
                    # This is magic that our base image points to
                    if tokens[1] != "ubuntu:16.04":
                        dep_ref = tokens[1].strip().split(':')[0].strip()
                        if '/' not in dep_ref:
                            raise AttributeError(
                                "Could not find docker FROM dependency: %s" %
                                dep_ref)
                        depToken = dep_ref.split('/')[1]
                        deps.append(depToken)
                        dep_docker_file = os.path.join(
                            os.path.dirname(docker_file),
                            depToken + ".dockerfile")
                        if not os.path.exists(dep_docker_file):
                            dep_docker_file = find(docker_dir,
                                                   depToken + ".dockerfile")
                        deps.extend(__gather_dependencies(dep_docker_file))

    return deps