import os
import time
import signal
import logging
import argparse
import functools
import contextlib
from typing import List, Tuple, Any, Callable, IO, cast, Optional, Iterator
from yaml import load as _yaml_load


YLoader = Callable[[IO], Any]
yaml_load = None  # type: YLoader


try:
    from yaml import CLoader
    yaml_load = cast(YLoader,  functools.partial(_yaml_load, Loader=CLoader))
except ImportError:
    yaml_load = cast(YLoader,  _yaml_load)


import texttable

try:
    import faulthandler
except ImportError:
    faulthandler = None

from . import utils, node
from .storage import make_storage, Storage
from .config import Config
from .logger import setup_loggers
from .stage import Stage
from .test_run_class import TestRun
from .ssh import set_ssh_key_passwd


# stages
from .ceph import DiscoverCephStage
from .openstack import DiscoverOSStage
from .fuel import DiscoverFuelStage
from .run_test import (CollectInfoStage, ExplicitNodesStage, SaveNodesStage,
                       RunTestsStage, ConnectStage, SleepStage, PrepareNodes)
from .report import ConsoleReportStage, HtmlReportStage
from .sensors import StartSensorsStage, CollectSensorsStage


logger = logging.getLogger("wally")


@contextlib.contextmanager
def log_stage(stage: Stage, cleanup: bool = False) -> Iterator[None]:
    logger.info("Start " + stage.name() + ("::cleanup" if cleanup else ""))
    try:
        yield
    except utils.StopTestError as exc:
        raise
    except Exception:
        logger.exception("During %s", stage.name() + ("::cleanup" if cleanup else ""))
        raise


def list_results(path: str) -> List[Tuple[str, str, str, str]]:
    results = []  # type: List[Tuple[float, str, str, str, str]]

    for dir_name in os.listdir(path):
        full_path = os.path.join(path, dir_name)

        try:
            stor = make_storage(full_path, existing=True)
        except Exception as exc:
            logger.warning("Can't load folder {}. Error {}".format(full_path, exc))

        comment = cast(str, stor['info/comment'])
        run_uuid = cast(str, stor['info/run_uuid'])
        run_time = cast(float, stor['info/run_time'])
        test_types = ""
        results.append((run_time,
                        run_uuid,
                        test_types,
                        time.ctime(run_time),
                        '-' if comment is None else comment))

    results.sort()
    return [i[1:] for i in results]


def log_nodes_statistic_stage(ctx: TestRun) -> None:
    utils.log_nodes_statistic(ctx.nodes)


def parse_args(argv):
    descr = "Disk io performance test suite"
    parser = argparse.ArgumentParser(prog='wally', description=descr)
    parser.add_argument("-l", '--log-level', help="print some extra log info")
    parser.add_argument("--ssh-key-passwd", default=None, help="Pass ssh key password")
    parser.add_argument("-s", '--settings-dir', default=None,
                        help="Folder to store key/settings/history files")

    subparsers = parser.add_subparsers(dest='subparser_name')

    # ---------------------------------------------------------------------
    report_parser = subparsers.add_parser('ls', help='list all results')
    report_parser.add_argument("result_storage", help="Folder with test results")

    # ---------------------------------------------------------------------
    compare_help = 'compare two results'
    report_parser = subparsers.add_parser('compare', help=compare_help)
    report_parser.add_argument("data_path1", help="First folder with test results")
    report_parser.add_argument("data_path2", help="Second folder with test results")

    # ---------------------------------------------------------------------
    report_help = 'run report on previously obtained results'
    report_parser = subparsers.add_parser('report', help=report_help)
    report_parser.add_argument("data_dir", help="folder with rest results")

    # ---------------------------------------------------------------------
    test_parser = subparsers.add_parser('test', help='run tests')
    test_parser.add_argument('--build-description', type=str, default="Build info")
    test_parser.add_argument('--build-id', type=str, default="id")
    test_parser.add_argument('--build-type', type=str, default="GA")
    test_parser.add_argument('--dont-collect', action='store_true', help="Don't collect cluster info")
    test_parser.add_argument('-n', '--no-tests', action='store_true', help="Don't run tests")
    test_parser.add_argument('--load-report', action='store_true')
    test_parser.add_argument("-k", '--keep-vm', action='store_true', help="Don't remove test vm's")
    test_parser.add_argument("-d", '--dont-discover-nodes', action='store_true',
                             help="Don't connect/discover fuel nodes")
    test_parser.add_argument('--no-report', action='store_true', help="Skip report stages")
    test_parser.add_argument('--result-dir', default=None, help="Save results to DIR", metavar="DIR")
    test_parser.add_argument("comment", help="Test information")
    test_parser.add_argument("config_file", help="Yaml config file")

    # ---------------------------------------------------------------------
    test_parser = subparsers.add_parser('resume', help='resume tests')
    test_parser.add_argument("storage_dir", help="Path to test directory")

    return parser.parse_args(argv[1:])


def get_config_path(config: Config, opts_value: Optional[str]) -> str:
    if opts_value is None and 'settings_dir' not in config:
        val = "~/.wally"
    elif opts_value is not None:
        val = opts_value
    else:
        val = config.settings_dir

    return os.path.abspath(os.path.expanduser(val))


def find_cfg_file(name: str, included_from: str = None) -> str:
    paths = [".", os.path.expanduser('~/.wally')]
    if included_from is not None:
        paths.append(os.path.dirname(included_from))

    search_paths = set(os.path.abspath(path) for path in paths if os.path.isdir(path))

    for folder in search_paths:
        path = os.path.join(folder, name)
        if os.path.exists(path):
            return path

    raise FileNotFoundError(name)


def load_config(path: str) -> Config:
    path = os.path.abspath(path)
    cfg_dict = yaml_load(open(path).read())

    while 'include' in cfg_dict:
        inc = cfg_dict.pop('include')
        if isinstance(inc, str):
            inc = [inc]

        for fname in inc:
            inc_path = find_cfg_file(fname, path)
            inc_dict = yaml_load(open(inc_path).read())
            inc_dict.update(cfg_dict)
            cfg_dict = inc_dict

    return Config(cfg_dict)


def main(argv: List[str]) -> int:
    if faulthandler is not None:
        faulthandler.register(signal.SIGUSR1, all_threads=True)

    opts = parse_args(argv)
    stages = []  # type: List[Stage]

    # stop mypy from telling that config & storage might be undeclared
    config = None  # type: Config
    storage = None  # type: Storage

    if opts.subparser_name == 'test':
        config = load_config(opts.config_file)

        config.storage_url, config.run_uuid = utils.get_uniq_path_uuid(config.results_dir)
        config.comment = opts.comment
        config.keep_vm = opts.keep_vm
        config.no_tests = opts.no_tests
        config.dont_discover_nodes = opts.dont_discover_nodes
        config.build_id = opts.build_id
        config.build_description = opts.build_description
        config.build_type = opts.build_type
        config.settings_dir = get_config_path(config, opts.settings_dir)

        storage = make_storage(config.storage_url)

        storage['config'] = config  # type: ignore

        stages.append(DiscoverCephStage())
        stages.append(DiscoverOSStage())
        stages.append(DiscoverFuelStage())
        stages.append(ExplicitNodesStage())
        stages.append(SaveNodesStage())
        stages.append(StartSensorsStage())
        stages.append(RunTestsStage())
        stages.append(CollectSensorsStage())
        stages.append(ConnectStage())
        stages.append(SleepStage())
        stages.append(PrepareNodes())

        if not opts.dont_collect:
            stages.append(CollectInfoStage())

        argv2 = argv[:]
        if '--ssh-key-passwd' in argv2:
            # don't save ssh key password to storage
            argv2[argv2.index("--ssh-key-passwd") + 1] = "<removed from output>"
        storage['cli'] = argv2

    elif opts.subparser_name == 'resume':
        storage = make_storage(opts.storage_dir, existing=True)
        config = storage.load(Config, 'config')
        # TODO: fix this
        # TODO: add node loading from storage
        # TODO: fill nodes conncreds with keys
        raise NotImplementedError("Resume in not fully implemented")

    elif opts.subparser_name == 'ls':
        tab = texttable.Texttable(max_width=200)
        tab.set_deco(tab.HEADER | tab.VLINES | tab.BORDER)
        tab.set_cols_align(["l", "l", "l", "l"])
        tab.header(["Name", "Tests", "Run at", "Comment"])
        tab.add_rows(list_results(opts.result_storage))
        print(tab.draw())
        return 0

    elif opts.subparser_name == 'report':
        storage = make_storage(opts.data_dir, existing=True)
        config.settings_dir = get_config_path(config, opts.settings_dir)

    elif opts.subparser_name == 'compare':
        # x = run_test.load_data_from_path(opts.data_path1)
        # y = run_test.load_data_from_path(opts.data_path2)
        # print(run_test.IOPerfTest.format_diff_for_console(
        #     [x['io'][0], y['io'][0]]))
        return 0

    report_stages = []  # type: List[Stage]
    if not getattr(opts, "no_report", False):
        report_stages.append(ConsoleReportStage())
        report_stages.append(HtmlReportStage())

    # log level is not a part of config
    if opts.log_level is not None:
        str_level = opts.log_level
    else:
        str_level = config.get('logging/log_level', 'INFO')

    log_config_file = config.get('logging/config', None)

    if log_config_file is not None:
        log_config_file = find_cfg_file(log_config_file, opts.config_file)

    setup_loggers(getattr(logging, str_level),
                  log_fd=storage.get_stream('log', "w"),
                  config_file=log_config_file)

    logger.info("All info would be stored into %r", config.storage_url)

    ctx = TestRun(config, storage)
    ctx.rpc_code, ctx.default_rpc_plugins = node.get_rpc_server_code()

    if opts.ssh_key_passwd is not None:
        set_ssh_key_passwd(opts.ssh_key_passwd)

    stages.sort(key=lambda x: x.priority)

    # TODO: run only stages, which have config
    failed = False
    cleanup_stages = []
    for stage in stages:
        if stage.config_block is not None:
            if stage.config_block not in ctx.config:
                continue

        cleanup_stages.append(stage)
        try:
            with log_stage(stage):
                stage.run(ctx)
        except (Exception, KeyboardInterrupt):
            failed = True
            break

    logger.debug("Start cleanup")
    cleanup_failed = False
    for stage in cleanup_stages[::-1]:
        try:
            with log_stage(stage, cleanup=True):
                stage.cleanup(ctx)
        except:
            cleanup_failed = True

    if not failed:
        for report_stage in report_stages:
            with log_stage(report_stage):
                report_stage.run(ctx)

    logger.info("All info is stored into %r", config.storage_url)

    if failed or cleanup_failed:
        logger.error("Tests are failed. See error details in log above")
        return 1
    else:
        logger.info("Tests finished successfully")
        return 0