import os
import sys
import json
import time
import pprint
import logging
import os.path
import argparse
import traceback

import io_scenario
from itest import IOPerfTest
from rest_api import add_test

import ssh_runner

try:
    import rally_runner
except ImportError:
    rally_runner = None

from starts_vms import nova_connect, create_vms_mt, clear_all


logger = logging.getLogger("io-perf-tool")
logger.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)
logger.addHandler(ch)

log_format = '%(asctime)s - %(levelname)s - %(name)s - %(message)s'
formatter = logging.Formatter(log_format,
                              "%H:%M:%S")
ch.setFormatter(formatter)


def run_io_test(tool,
                script_args,
                test_runner,
                keep_temp_files=False):

    files_dir = os.path.dirname(io_scenario.__file__)

    path = 'iozone' if 'iozone' == tool else 'fio'
    src_testtool_path = os.path.join(files_dir, path)

    obj = IOPerfTest(script_args,
                     src_testtool_path,
                     None,
                     keep_temp_files)

    return test_runner(obj)


def parse_args(argv):
    parser = argparse.ArgumentParser(
        description="Run disk io performance test")

    parser.add_argument("tool_type", help="test tool type",
                        choices=['iozone', 'fio'])

    parser.add_argument("-l", dest='extra_logs',
                        action='store_true', default=False,
                        help="print some extra log info")

    parser.add_argument("-o", "--io-opts", dest='io_opts',
                        help="cmd line options for io.py")

    parser.add_argument("-f", "--io-opts-file", dest='io_opts_file',
                        type=argparse.FileType('r'), default=None,
                        help="file with cmd line options for io.py")

    parser.add_argument("-t", "--test-directory", help="directory with test",
                        dest="test_directory", required=True)

    parser.add_argument("--max-preparation-time", default=300,
                        type=int, dest="max_preparation_time")

    parser.add_argument("-b", "--build-info", default=None,
                        dest="build_name")

    parser.add_argument("-d", "--data-server-url", default=None,
                        dest="data_server_url")

    parser.add_argument("-n", "--lab-name", default=None,
                        dest="lab_name")

    parser.add_argument("-k", "--keep", default=False,
                        help="keep temporary files",
                        dest="keep_temp_files", action='store_true')

    choices = ["ssh"]
    if rally_runner is not None:
        choices.append("rally")

    parser.add_argument("--runner", required=True,
                        choices=choices, help="runner type")

    parser.add_argument("--runner-extra-opts", default="",
                        dest="runner_opts", help="runner extra options")

    return parser.parse_args(argv)


def format_measurements_stat(res):
    if len(res) != 0:
        bw_mean = 0.0
        for measurement in res:
            bw_mean += measurement["bw_mean"]

        bw_mean /= len(res)

        it = ((bw_mean - measurement["bw_mean"]) ** 2 for measurement in res)
        bw_dev = sum(it) ** 0.5

        meta = res[0]['__meta__']

        sync = meta['sync']
        direct = meta['direct_io']

        if sync and direct:
            ss = "d+"
        elif sync:
            ss = "s"
        elif direct:
            ss = "d"
        else:
            ss = "a"

        key = "{0} {1} {2} {3}k".format(meta['action'], ss,
                                        meta['concurence'],
                                        meta['blocksize'])

        data = json.dumps({key: (int(bw_mean), int(bw_dev))})

        return data


def get_io_opts(io_opts_file, io_opts):
    if io_opts_file is not None and io_opts is not None:
        print "Options --io-opts-file and --io-opts can't be " + \
            "provided same time"
        exit(1)

    if io_opts_file is None and io_opts is None:
        print "Either --io-opts-file or --io-opts should " + \
            "be provided"
        exit(1)

    if io_opts_file is not None:
        io_opts = []

        opt_lines = io_opts_file.readlines()
        opt_lines = [i for i in opt_lines if i != "" and not i.startswith("#")]

        for opt_line in opt_lines:
            if opt_line.strip() != "":
                io_opts.append([opt.strip()
                               for opt in opt_line.strip().split(" ")
                               if opt.strip() != ""])
    else:
        io_opts = [[opt.strip()
                   for opt in io_opts.split(" ")
                   if opt.strip() != ""]]

    if len(io_opts) == 0:
        print "Can't found parameters for io. Check" + \
            "--io-opts-file or --io-opts options"
        exit(1)

    return io_opts


def format_result(res):
    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, format_measurements_stat(res), "=" * 80)


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

    if not opts.extra_logs:
        def nolog(x):
            pass

    io_opts = get_io_opts(opts.io_opts_file, opts.io_opts)
    data_server_url = opts.data_server_url
    # lab_name = opts.lab_name
    build_name = opts.build_name

    if opts.runner == "rally":
        logger.debug("Use rally runner")
        for script_args in io_opts:

            cmd_line = " ".join(script_args)
            logger.debug("Run test with {0!r} params".format(cmd_line))

            runner = rally_runner.get_rally_runner(
                files_dir=os.path.dirname(io_scenario.__file__),
                rally_extra_opts=opts.runner_opts.split(" "),
                max_preparation_time=opts.max_preparation_time,
                keep_temp_files=opts.keep_temp_files)

            res = run_io_test(opts.tool_type,
                              script_args,
                              runner,
                              opts.keep_temp_files)
            logger.debug(format_result(res))

    elif opts.runner == "ssh":
        logger.debug("Use ssh runner")
        create_vms_opts = {}
        for opt in opts.runner_opts.split(","):
            name, val = opt.split("=", 1)
            create_vms_opts[name] = val

        user = create_vms_opts.pop("user")
        key_file = create_vms_opts.pop("key_file")
        aff_group = create_vms_opts.pop("aff_group", None)
        raw_count = create_vms_opts.pop("count", "x1")

        logger.debug("Connection to nova")
        nova = nova_connect()

        if raw_count.startswith("x"):
            logger.debug("Getting amount of compute services")
            count = len(nova.services.list(binary="nova-compute"))
            count *= int(raw_count[1:])
        else:
            count = int(raw_count)

        if aff_group is not None:
            scheduler_hints = {'group': aff_group}
        else:
            scheduler_hints = None

        create_vms_opts['scheduler_hints'] = scheduler_hints

        # nova, amount, keypair_name, img_name,
        # flavor_name, vol_sz=None, network_zone_name=None,
        # flt_ip_pool=None, name_templ='ceph-test-{0}',
        # scheduler_hints=None

        logger.debug("Will start {0} vms".format(count))

        try:
            ips = [i[0] for i in create_vms_mt(nova, count, **create_vms_opts)]

            uris = ["{0}@{1}::{2}".format(user, ip, key_file) for ip in ips]

            for script_args in io_opts:
                cmd_line = " ".join(script_args)
                logger.debug("Run test with {0!r} params".format(cmd_line))
                latest_start_time = opts.max_preparation_time + time.time()
                runner = ssh_runner.get_ssh_runner(uris,
                                                   latest_start_time,
                                                   opts.keep_temp_files)
                res = run_io_test(opts.tool_type,
                                  script_args,
                                  runner,
                                  opts.keep_temp_files)
                logger.debug(format_result(res))

        except:
            traceback.print_exc()
        finally:
            logger.debug("Clearing")
            clear_all(nova)

    result = json.loads(format_measurements_stat(res))
    result['name'] = build_name
    add_test(build_name, result, data_server_url)
    return 0


if __name__ == '__main__':
    exit(main(sys.argv[1:]))