from __future__ import print_function

import os
import sys
import time
import Queue
import pprint
import logging
import argparse
import functools
import threading
import contextlib
import subprocess
import collections

import yaml
from concurrent.futures import ThreadPoolExecutor

from wally import pretty_yaml
from wally.discover import discover, Node, undiscover
from wally import utils, report, ssh_utils, start_vms
from wally.suits.itest import IOPerfTest, PgBenchTest
from wally.config import cfg_dict, load_config, setup_loggers
from wally.sensors_utils import deploy_sensors_stage, SensorDatastore

try:
    from wally import webui
except ImportError:
    webui = None


logger = logging.getLogger("wally")


def format_result(res, formatter):
    data = "\n{0}\n".format("=" * 80)
    data += pprint.pformat(res) + "\n"
    data += "{0}\n".format("=" * 80)
    templ = "{0}\n\n====> {1}\n\n{2}\n\n"
    return templ.format(data, formatter(res), "=" * 80)


class Context(object):
    def __init__(self):
        self.build_meta = {}
        self.nodes = []
        self.clear_calls_stack = []
        self.openstack_nodes_ids = []
        self.sensors_mon_q = None


def connect_one(node, vm=False):
    if node.conn_url == 'local':
        node.connection = ssh_utils.connect(node.conn_url)
        return

    try:
        ssh_pref = "ssh://"
        if node.conn_url.startswith(ssh_pref):
            url = node.conn_url[len(ssh_pref):]

            if vm:
                conn_timeout = 240
            else:
                conn_timeout = 30

            node.connection = ssh_utils.connect(url,
                                                conn_timeout=conn_timeout)
        else:
            raise ValueError("Unknown url type {0}".format(node.conn_url))
    except Exception as exc:
        # logger.exception("During connect to " + node.get_conn_id())
        msg = "During connect to {0}: {1!s}".format(node.get_conn_id(),
                                                    exc)
        logger.error(msg)
        node.connection = None


def connect_all(nodes, vm=False):
    logger.info("Connecting to nodes")
    with ThreadPoolExecutor(32) as pool:
        connect_one_f = functools.partial(connect_one, vm=vm)
        list(pool.map(connect_one_f, nodes))


def test_thread(test, node, barrier, res_q):
    exc = None
    try:
        logger.debug("Run preparation for {0}".format(node.get_conn_id()))
        test.pre_run()
        logger.debug("Run test for {0}".format(node.get_conn_id()))
        test.run(barrier)
    except utils.StopTestError as exc:
        pass
    except Exception as exc:
        msg = "In test {0} for node {1}"
        msg = msg.format(test, node.get_conn_id())
        logger.exception(msg)
        exc = utils.StopTestError(msg, exc)

    try:
        test.cleanup()
    except utils.StopTestError as exc1:
        if exc is None:
            exc = exc1
    except:
        msg = "Duringf cleanup - in test {0} for node {1}"
        logger.exception(msg.format(test, node))

    if exc is not None:
        res_q.put(exc)


def run_tests(cfg, test_block, nodes):
    tool_type_mapper = {
        "io": IOPerfTest,
        "pgbench": PgBenchTest,
    }

    test_nodes = [node for node in nodes
                  if 'testnode' in node.roles]
    test_number_per_type = {}
    res_q = Queue.Queue()

    for name, params in test_block.items():
        logger.info("Starting {0} tests".format(name))
        test_num = test_number_per_type.get(name, 0)
        test_number_per_type[name] = test_num + 1
        threads = []
        barrier = utils.Barrier(len(test_nodes))
        coord_q = Queue.Queue()
        test_cls = tool_type_mapper[name]
        rem_folder = cfg['default_test_local_folder'].format(name=name)

        for idx, node in enumerate(test_nodes):
            msg = "Starting {0} test on {1} node"
            logger.debug(msg.format(name, node.conn_url))

            dr = os.path.join(
                    cfg_dict['test_log_directory'],
                    "{0}_{1}_{2}".format(name, test_num, node.get_ip())
                )

            if not os.path.exists(dr):
                os.makedirs(dr)

            test = test_cls(options=params,
                            is_primary=(idx == 0),
                            on_result_cb=res_q.put,
                            test_uuid=cfg['run_uuid'],
                            node=node,
                            remote_dir=rem_folder,
                            log_directory=dr,
                            coordination_queue=coord_q)
            th = threading.Thread(None, test_thread, None,
                                  (test, node, barrier, res_q))
            threads.append(th)
            th.daemon = True
            th.start()

        th = threading.Thread(None, test_cls.coordination_th, None,
                              (coord_q, barrier, len(threads)))
        threads.append(th)
        th.daemon = True
        th.start()

        def gather_results(res_q, results):
            while not res_q.empty():
                val = res_q.get()

                if isinstance(val, utils.StopTestError):
                    raise val

                if isinstance(val, Exception):
                    msg = "Exception during test execution: {0!s}"
                    raise ValueError(msg.format(val))

                results.append(val)

        results = []

        # MAX_WAIT_TIME = 10
        # end_time = time.time() + MAX_WAIT_TIME

        # while time.time() < end_time:
        while True:
            for th in threads:
                th.join(1)
                gather_results(res_q, results)
                # if time.time() > end_time:
                #     break

            if all(not th.is_alive() for th in threads):
                break

        # if any(th.is_alive() for th in threads):
        #     logger.warning("Some test threads still running")

        gather_results(res_q, results)
        yield name, test.merge_results(results)


def log_nodes_statistic(_, ctx):
    nodes = ctx.nodes
    logger.info("Found {0} nodes total".format(len(nodes)))
    per_role = collections.defaultdict(lambda: 0)
    for node in nodes:
        for role in node.roles:
            per_role[role] += 1

    for role, count in sorted(per_role.items()):
        logger.debug("Found {0} nodes with role {1}".format(count, role))


def connect_stage(cfg, ctx):
    ctx.clear_calls_stack.append(disconnect_stage)
    connect_all(ctx.nodes)

    all_ok = True

    for node in ctx.nodes:
        if node.connection is None:
            if 'testnode' in node.roles:
                msg = "Can't connect to testnode {0}"
                raise RuntimeError(msg.format(node.get_conn_id()))
            else:
                msg = "Node {0} would be excluded - can't connect"
                logger.warning(msg.format(node.get_conn_id()))
                all_ok = False

    if all_ok:
        logger.info("All nodes connected successfully")

    ctx.nodes = [node for node in ctx.nodes
                 if node.connection is not None]


def discover_stage(cfg, ctx):
    if cfg.get('discover') is not None:
        discover_objs = [i.strip() for i in cfg['discover'].strip().split(",")]

        nodes, clean_data = discover(ctx,
                                     discover_objs,
                                     cfg['clouds'],
                                     cfg['var_dir'],
                                     not cfg['dont_discover_nodes'])

        def undiscover_stage(cfg, ctx):
            undiscover(clean_data)

        ctx.clear_calls_stack.append(undiscover_stage)
        ctx.nodes.extend(nodes)

    for url, roles in cfg.get('explicit_nodes', {}).items():
        ctx.nodes.append(Node(url, roles.split(",")))


def get_OS_credentials(cfg, ctx, creds_type):
    creds = None

    if creds_type == 'clouds':
        logger.info("Using OS credentials from 'cloud' section")
        if 'openstack' in cfg['clouds']:
            os_cfg = cfg['clouds']['openstack']

            tenant = os_cfg['OS_TENANT_NAME'].strip()
            user = os_cfg['OS_USERNAME'].strip()
            passwd = os_cfg['OS_PASSWORD'].strip()
            auth_url = os_cfg['OS_AUTH_URL'].strip()

        elif 'fuel' in cfg['clouds'] and \
             'openstack_env' in cfg['clouds']['fuel']:
            creds = ctx.fuel_openstack_creds

    elif creds_type == 'ENV':
        logger.info("Using OS credentials from shell environment")
        user, passwd, tenant, auth_url = start_vms.ostack_get_creds()
    elif os.path.isfile(creds_type):
        logger.info("Using OS credentials from " + creds_type)
        fc = open(creds_type).read()

        echo = 'echo "$OS_TENANT_NAME:$OS_USERNAME:$OS_PASSWORD@$OS_AUTH_URL"'

        p = subprocess.Popen(['/bin/bash'], shell=False,
                             stdout=subprocess.PIPE,
                             stdin=subprocess.PIPE,
                             stderr=subprocess.STDOUT)
        p.stdin.write(fc + "\n" + echo)
        p.stdin.close()
        code = p.wait()
        data = p.stdout.read().strip()

        if code != 0:
            msg = "Failed to get creads from openrc file: " + data
            logger.error(msg)
            raise RuntimeError(msg)

        try:
            user, tenant, passwd_auth_url = data.split(':', 2)
            passwd, auth_url = passwd_auth_url.rsplit("@", 1)
            assert (auth_url.startswith("https://") or
                    auth_url.startswith("http://"))
        except Exception:
            msg = "Failed to get creads from openrc file: " + data
            logger.exception(msg)
            raise

    else:
        msg = "Creds {0!r} isn't supported".format(creds_type)
        raise ValueError(msg)

    if creds is None:
        creds = {'name': user,
                 'passwd': passwd,
                 'tenant': tenant,
                 'auth_url': auth_url}

    msg = "OS_CREDS: user={name} tenant={tenant} auth_url={auth_url}"
    logger.debug(msg.format(**creds))
    return creds


@contextlib.contextmanager
def create_vms_ctx(ctx, cfg, config):
    params = config['vm_params'].copy()
    os_nodes_ids = []

    os_creds_type = config['creds']
    os_creds = get_OS_credentials(cfg, ctx, os_creds_type)

    start_vms.nova_connect(**os_creds)

    logger.info("Preparing openstack")
    start_vms.prepare_os_subpr(**os_creds)

    new_nodes = []
    try:
        params['group_name'] = cfg_dict['run_uuid']
        for new_node, node_id in start_vms.launch_vms(params):
            new_node.roles.append('testnode')
            ctx.nodes.append(new_node)
            os_nodes_ids.append(node_id)
            new_nodes.append(new_node)

        store_nodes_in_log(cfg, os_nodes_ids)
        ctx.openstack_nodes_ids = os_nodes_ids

        yield new_nodes

    finally:
        if not cfg['keep_vm']:
            shut_down_vms_stage(cfg, ctx)


def run_tests_stage(cfg, ctx):
    ctx.results = []

    if 'tests' not in cfg:
        return

    for group in cfg['tests']:

        assert len(group.items()) == 1
        key, config = group.items()[0]

        if 'start_test_nodes' == key:
            with create_vms_ctx(ctx, cfg, config) as new_nodes:
                connect_all(new_nodes, True)

                for node in new_nodes:
                    if node.connection is None:
                        msg = "Failed to connect to vm {0}"
                        raise RuntimeError(msg.format(node.get_conn_id()))

                deploy_sensors_stage(cfg_dict,
                                     ctx,
                                     nodes=new_nodes,
                                     undeploy=False)

                if not cfg['no_tests']:
                    for test_group in config.get('tests', []):
                        test_res = run_tests(cfg, test_group, ctx.nodes)
                        ctx.results.extend(test_res)
        else:
            if not cfg['no_tests']:
                test_res = run_tests(cfg, group, ctx.nodes)
                ctx.results.extend(test_res)


def shut_down_vms_stage(cfg, ctx):
    vm_ids_fname = cfg_dict['vm_ids_fname']
    if ctx.openstack_nodes_ids is None:
        nodes_ids = open(vm_ids_fname).read().split()
    else:
        nodes_ids = ctx.openstack_nodes_ids

    if len(nodes_ids) != 0:
        logger.info("Removing nodes")
        start_vms.clear_nodes(nodes_ids)
        logger.info("Nodes has been removed")

    if os.path.exists(vm_ids_fname):
        os.remove(vm_ids_fname)


def store_nodes_in_log(cfg, nodes_ids):
    with open(cfg['vm_ids_fname'], 'w') as fd:
        fd.write("\n".join(nodes_ids))


def clear_enviroment(cfg, ctx):
    if os.path.exists(cfg_dict['vm_ids_fname']):
        shut_down_vms_stage(cfg, ctx)


def disconnect_stage(cfg, ctx):
    ssh_utils.close_all_sessions()

    for node in ctx.nodes:
        if node.connection is not None:
            node.connection.close()


def store_raw_results_stage(cfg, ctx):

    raw_results = os.path.join(cfg_dict['var_dir'], 'raw_results.yaml')

    if os.path.exists(raw_results):
        cont = yaml.load(open(raw_results).read())
    else:
        cont = []

    cont.extend(utils.yamable(ctx.results))
    raw_data = pretty_yaml.dumps(cont)

    with open(raw_results, "w") as fd:
        fd.write(raw_data)


def console_report_stage(cfg, ctx):
    for tp, data in ctx.results:
        if 'io' == tp and data is not None:
            print("\n")
            print(IOPerfTest.format_for_console(data))
            print("\n")


def html_report_stage(cfg, ctx):
    html_rep_fname = cfg['html_report_file']

    try:
        fuel_url = cfg['clouds']['fuel']['url']
    except KeyError:
        fuel_url = None

    try:
        creds = cfg['clouds']['fuel']['creds']
    except KeyError:
        creds = None

    report.make_io_report(ctx.results, html_rep_fname, fuel_url, creds=creds)

    text_rep_fname = cfg_dict['text_report_file']
    with open(text_rep_fname, "w") as fd:
        for tp, data in ctx.results:
            if 'io' == tp and data is not None:
                fd.write(IOPerfTest.format_for_console(data))
                fd.write("\n")
                fd.flush()

    logger.info("Text report were stored in " + text_rep_fname)


def complete_log_nodes_statistic(cfg, ctx):
    nodes = ctx.nodes
    for node in nodes:
        logger.debug(str(node))


def load_data_from(var_dir):
    def load_data_from_file(cfg, ctx):
        raw_results = os.path.join(var_dir, 'raw_results.yaml')
        ctx.results = yaml.load(open(raw_results).read())
    return load_data_from_file


def start_web_ui(cfg, ctx):
    if webui is None:
        logger.error("Can't start webui. Install cherrypy module")
        ctx.web_thread = None
    else:
        th = threading.Thread(None, webui.web_main_thread, "webui", (None,))
        th.daemon = True
        th.start()
        ctx.web_thread = th


def stop_web_ui(cfg, ctx):
    webui.web_main_stop()
    time.sleep(1)


def parse_args(argv):
    descr = "Disk io performance test suite"
    parser = argparse.ArgumentParser(prog='wally', description=descr)

    parser.add_argument("-l", dest='extra_logs',
                        action='store_true', default=False,
                        help="print some extra log info")
    parser.add_argument("-b", '--build_description',
                        type=str, default="Build info")
    parser.add_argument("-i", '--build_id', type=str, default="id")
    parser.add_argument("-t", '--build_type', type=str, default="GA")
    parser.add_argument("-u", '--username', type=str, default="admin")
    parser.add_argument("-n", '--no-tests', action='store_true',
                        help="Don't run tests", default=False)
    parser.add_argument("-p", '--post-process-only', metavar="VAR_DIR",
                        help="Only process data from previour run")
    parser.add_argument("-k", '--keep-vm', action='store_true',
                        help="Don't remove test vm's", default=False)
    parser.add_argument("-d", '--dont-discover-nodes', action='store_true',
                        help="Don't connect/discover fuel nodes",
                        default=False)
    parser.add_argument("-r", '--no-html-report', action='store_true',
                        help="Skip html report", default=False)
    parser.add_argument("config_file")

    return parser.parse_args(argv[1:])


def main(argv):
    opts = parse_args(argv)

    if opts.post_process_only is not None:
        stages = [
            load_data_from(opts.post_process_only)
        ]
    else:
        stages = [
            discover_stage,
            log_nodes_statistic,
            connect_stage,
            deploy_sensors_stage,
            run_tests_stage,
            store_raw_results_stage
        ]

    report_stages = [
        console_report_stage,
    ]

    if not opts.no_html_report:
        report_stages.append(html_report_stage)

    load_config(opts.config_file, opts.post_process_only)

    if cfg_dict.get('logging', {}).get("extra_logs", False) or opts.extra_logs:
        level = logging.DEBUG
    else:
        level = logging.WARNING

    setup_loggers(level, cfg_dict['log_file'])

    logger.info("All info would be stored into {0}".format(
        cfg_dict['var_dir']))

    ctx = Context()
    ctx.build_meta['build_id'] = opts.build_id
    ctx.build_meta['build_descrption'] = opts.build_description
    ctx.build_meta['build_type'] = opts.build_type
    ctx.build_meta['username'] = opts.username
    ctx.sensors_data = SensorDatastore()

    cfg_dict['keep_vm'] = opts.keep_vm
    cfg_dict['no_tests'] = opts.no_tests
    cfg_dict['dont_discover_nodes'] = opts.dont_discover_nodes

    if cfg_dict.get('run_web_ui', False):
        start_web_ui(cfg_dict, ctx)

    try:
        for stage in stages:
            logger.info("Start {0.__name__} stage".format(stage))
            stage(cfg_dict, ctx)
    except Exception as exc:
        msg = "Exception during {0.__name__}: {1!s}".format(stage, exc)
        logger.error(msg)
    finally:
        exc, cls, tb = sys.exc_info()
        for stage in ctx.clear_calls_stack[::-1]:
            try:
                logger.info("Start {0.__name__} stage".format(stage))
                stage(cfg_dict, ctx)
            except utils.StopTestError as exc:
                msg = "During {0.__name__} stage: {1}".format(stage, exc)
                logger.error(msg)
            except Exception as exc:
                logger.exception("During {0.__name__} stage".format(stage))

        # if exc is not None:
        #     raise exc, cls, tb

    if exc is None:
        for report_stage in report_stages:
            report_stage(cfg_dict, ctx)

    logger.info("All info stored in {0} folder".format(cfg_dict['var_dir']))

    if cfg_dict.get('run_web_ui', False):
        stop_web_ui(cfg_dict, ctx)

    if exc is None:
        logger.info("Tests finished successfully")
        return 0
    else:
        logger.error("Tests are failed. See detailed error above")
        return 1