import errno
import os
from functools import wraps

import click
import logbook
import pandas as pd
from six import text_type

from catalyst.data import bundles as bundles_module
from catalyst.exchange.exchange_bundle import ExchangeBundle
from catalyst.exchange.utils.exchange_utils import delete_algo_folder
from catalyst.utils.cli import Date, Timestamp
from catalyst.utils.run_algo import _run, load_extensions

try:
    __IPYTHON__
except NameError:
    __IPYTHON__ = False


@click.group()
@click.option(
    '-e',
    '--extension',
    multiple=True,
    help='File or module path to a catalyst extension to load.',
)
@click.option(
    '--strict-extensions/--non-strict-extensions',
    is_flag=True,
    help='If --strict-extensions is passed then catalyst will not run '
         'if it cannot load all of the specified extensions. If this is '
         'not passed or --non-strict-extensions is passed then the '
         'failure will be logged but execution will continue.',
)
@click.option(
    '--default-extension/--no-default-extension',
    is_flag=True,
    default=True,
    help="Don't load the default catalyst extension.py file "
         "in $CATALYST_HOME.",
)
@click.version_option()
def main(extension, strict_extensions, default_extension):
    """Top level catalyst entry point.
    """
    # install a logbook handler before performing any other operations
    logbook.StderrHandler().push_application()
    load_extensions(
        default_extension,
        extension,
        strict_extensions,
        os.environ,
    )


def extract_option_object(option):
    """Convert a click.option call into a click.Option object.

    Parameters
    ----------
    option : decorator
        A click.option decorator.

    Returns
    -------
    option_object : click.Option
        The option object that this decorator will create.
    """

    @option
    def opt():
        pass

    return opt.__click_params__[0]


def ipython_only(option):
    """Mark that an option should only be exposed in IPython.

    Parameters
    ----------
    option : decorator
        A click.option decorator.

    Returns
    -------
    ipython_only_dec : decorator
        A decorator that correctly applies the argument even when not
        using IPython mode.
    """
    if __IPYTHON__:
        return option

    argname = extract_option_object(option).name

    def d(f):
        @wraps(f)
        def _(*args, **kwargs):
            kwargs[argname] = None
            return f(*args, **kwargs)

        return _

    return d


@main.command()
@click.option(
    '-f',
    '--algofile',
    default=None,
    type=click.File('r'),
    help='The file that contains the algorithm to run.',
)
@click.option(
    '-t',
    '--algotext',
    help='The algorithm script to run.',
)
@click.option(
    '-D',
    '--define',
    multiple=True,
    help="Define a name to be bound in the namespace before executing"
         " the algotext. For example '-Dname=value'. The value may be"
         " any python expression. These are evaluated in order so they"
         " may refer to previously defined names.",
)
@click.option(
    '--data-frequency',
    type=click.Choice({'daily', 'minute'}),
    default='daily',
    show_default=True,
    help='The data frequency of the simulation.',
)
@click.option(
    '--capital-base',
    type=float,
    show_default=True,
    help='The starting capital for the simulation.',
)
@click.option(
    '-b',
    '--bundle',
    default='poloniex',
    metavar='BUNDLE-NAME',
    show_default=True,
    help='The data bundle to use for the simulation.',
)
@click.option(
    '--bundle-timestamp',
    type=Timestamp(),
    default=pd.Timestamp.utcnow(),
    show_default=False,
    help='The date to lookup data on or before.\n'
         '[default: <current-time>]'
)
@click.option(
    '-s',
    '--start',
    type=Date(tz='utc', as_timestamp=True),
    help='The start date of the simulation.',
)
@click.option(
    '-e',
    '--end',
    type=Date(tz='utc', as_timestamp=True),
    help='The end date of the simulation.',
)
@click.option(
    '-o',
    '--output',
    default='-',
    metavar='FILENAME',
    show_default=True,
    help="The location to write the perf data. If this is '-' the perf"
         " will be written to stdout.",
)
@click.option(
    '--print-algo/--no-print-algo',
    is_flag=True,
    default=False,
    help='Print the algorithm to stdout.',
)
@ipython_only(click.option(
    '--local-namespace/--no-local-namespace',
    is_flag=True,
    default=None,
    help='Should the algorithm methods be resolved in the local namespace.'
))
@click.option(
    '-x',
    '--exchange-name',
    help='The name of the targeted exchange.',
)
@click.option(
    '-n',
    '--algo-namespace',
    help='A label assigned to the algorithm for data storage purposes.'
)
@click.option(
    '-c',
    '--base-currency',
    help='The base currency used to calculate statistics '
         '(e.g. usd, btc, eth).',
)
@click.pass_context
def run(ctx,
        algofile,
        algotext,
        define,
        data_frequency,
        capital_base,
        bundle,
        bundle_timestamp,
        start,
        end,
        output,
        print_algo,
        local_namespace,
        exchange_name,
        algo_namespace,
        base_currency):
    """Run a backtest for the given algorithm.
    """

    if (algotext is not None) == (algofile is not None):
        ctx.fail(
            "must specify exactly one of '-f' / '--algofile' or"
            " '-t' / '--algotext'",
        )

    # check that the start and end dates are passed correctly
    if start is None and end is None:
        # check both at the same time to avoid the case where a user
        # does not pass either of these and then passes the first only
        # to be told they need to pass the second argument also
        ctx.fail(
            "must specify dates with '-s' / '--start' and '-e' / '--end'"
            " in backtest mode",
        )
    if start is None:
        ctx.fail("must specify a start date with '-s' / '--start'"
                 " in backtest mode")
    if end is None:
        ctx.fail("must specify an end date with '-e' / '--end'"
                 " in backtest mode")

    if exchange_name is None:
        ctx.fail("must specify an exchange name '-x'")

    if base_currency is None:
        ctx.fail("must specify a base currency with '-c' in backtest mode")

    if capital_base is None:
        ctx.fail("must specify a capital base with '--capital-base'")

    click.echo('Running in backtesting mode.')

    perf = _run(
        initialize=None,
        handle_data=None,
        before_trading_start=None,
        analyze=None,
        algofile=algofile,
        algotext=algotext,
        defines=define,
        data_frequency=data_frequency,
        capital_base=capital_base,
        data=None,
        bundle=bundle,
        bundle_timestamp=bundle_timestamp,
        start=start,
        end=end,
        output=output,
        print_algo=print_algo,
        local_namespace=local_namespace,
        environ=os.environ,
        live=False,
        exchange=exchange_name,
        algo_namespace=algo_namespace,
        base_currency=base_currency,
        analyze_live=None,
        live_graph=False,
        simulate_orders=True,
        auth_aliases=None,
        stats_output=None,
    )

    if output == '-':
        click.echo(str(perf))
    elif output != os.devnull:  # make the catalyst magic not write any data
        perf.to_pickle(output)

    return perf


def catalyst_magic(line, cell=None):
    """The catalyst IPython cell magic.
    """
    load_extensions(
        default=True,
        extensions=[],
        strict=True,
        environ=os.environ,
    )
    try:
        return run.main(
            # put our overrides at the start of the parameter list so that
            # users may pass values with higher precedence
            [
                '--algotext', cell,
                '--output', os.devnull,  # don't write the results by default
            ] + ([
                     # these options are set when running in line magic mode
                     # set a non None algo text to use the ipython user_ns
                     '--algotext', '',
                     '--local-namespace',
                 ] if cell is None else []) + line.split(),
            '%s%%catalyst' % ((cell or '') and '%'),
            # don't use system exit and propogate errors to the caller
            standalone_mode=False,
        )
    except SystemExit as e:
        # https://github.com/mitsuhiko/click/pull/533
        # even in standalone_mode=False `--help` really wants to kill us ;_;
        if e.code:
            raise ValueError('main returned non-zero status code: %d' % e.code)


@main.command()
@click.option(
    '-f',
    '--algofile',
    default=None,
    type=click.File('r'),
    help='The file that contains the algorithm to run.',
)
@click.option(
    '--capital-base',
    type=float,
    show_default=True,
    help='The amount of capital (in base_currency) allocated to trading.',
)
@click.option(
    '-t',
    '--algotext',
    help='The algorithm script to run.',
)
@click.option(
    '-D',
    '--define',
    multiple=True,
    help="Define a name to be bound in the namespace before executing"
         " the algotext. For example '-Dname=value'. The value may be"
         " any python expression. These are evaluated in order so they"
         " may refer to previously defined names.",
)
@click.option(
    '-o',
    '--output',
    default='-',
    metavar='FILENAME',
    show_default=True,
    help="The location to write the perf data. If this is '-' the perf will"
         " be written to stdout.",
)
@click.option(
    '--print-algo/--no-print-algo',
    is_flag=True,
    default=False,
    help='Print the algorithm to stdout.',
)
@ipython_only(click.option(
    '--local-namespace/--no-local-namespace',
    is_flag=True,
    default=None,
    help='Should the algorithm methods be resolved in the local namespace.'
))
@click.option(
    '-x',
    '--exchange-name',
    help='The name of the targeted exchange.',
)
@click.option(
    '-n',
    '--algo-namespace',
    help='A label assigned to the algorithm for data storage purposes.'
)
@click.option(
    '-c',
    '--base-currency',
    help='The base currency used to calculate statistics '
         '(e.g. usd, btc, eth).',
)
@click.option(
    '-e',
    '--end',
    type=Date(tz='utc', as_timestamp=True),
    help='An optional end date at which to stop the execution.',
)
@click.option(
    '--live-graph/--no-live-graph',
    is_flag=True,
    default=False,
    help='Display live graph.',
)
@click.option(
    '--simulate-orders/--no-simulate-orders',
    is_flag=True,
    default=True,
    help='Simulating orders enable the paper trading mode. No orders will be '
         'sent to the exchange unless set to false.',
)
@click.option(
    '--auth-aliases',
    default=None,
    help='Authentication file aliases for the specified exchanges. By default,'
         'each exchange uses the "auth.json" file in the exchange folder. '
         'Specifying an "auth2" alias would use "auth2.json". It should be '
         'specified like this: "[exchange_name],[alias],..." For example, '
         '"binance,auth2" or "binance,auth2,bittrex,auth2".',
)
@click.pass_context
def live(ctx,
         algofile,
         capital_base,
         algotext,
         define,
         output,
         print_algo,
         local_namespace,
         exchange_name,
         algo_namespace,
         base_currency,
         end,
         live_graph,
         auth_aliases,
         simulate_orders):
    """Trade live with the given algorithm.
    """
    if (algotext is not None) == (algofile is not None):
        ctx.fail(
            "must specify exactly one of '-f' / '--algofile' or"
            " '-t' / '--algotext'",
        )

    if exchange_name is None:
        ctx.fail("must specify an exchange name '-x'")

    if algo_namespace is None:
        ctx.fail("must specify an algorithm name '-n' in live execution mode")

    if base_currency is None:
        ctx.fail("must specify a base currency '-c' in live execution mode")

    if capital_base is None:
        ctx.fail("must specify a capital base with '--capital-base'")

    if simulate_orders:
        click.echo('Running in paper trading mode.')

    else:
        click.echo('Running in live trading mode.')

    perf = _run(
        initialize=None,
        handle_data=None,
        before_trading_start=None,
        analyze=None,
        algofile=algofile,
        algotext=algotext,
        defines=define,
        data_frequency=None,
        capital_base=capital_base,
        data=None,
        bundle=None,
        bundle_timestamp=None,
        start=None,
        end=end,
        output=output,
        print_algo=print_algo,
        local_namespace=local_namespace,
        environ=os.environ,
        live=True,
        exchange=exchange_name,
        algo_namespace=algo_namespace,
        base_currency=base_currency,
        live_graph=live_graph,
        analyze_live=None,
        simulate_orders=simulate_orders,
        auth_aliases=auth_aliases,
        stats_output=None,
    )

    if output == '-':
        click.echo(str(perf))
    elif output != os.devnull:  # make the catalyst magic not write any data
        perf.to_pickle(output)

    return perf


@main.command(name='ingest-exchange')
@click.option(
    '-x',
    '--exchange-name',
    help='The name of the exchange bundle to ingest.',
)
@click.option(
    '-f',
    '--data-frequency',
    type=click.Choice({'daily', 'minute', 'daily,minute', 'minute,daily'}),
    default='daily',
    show_default=True,
    help='The data frequency of the desired OHLCV bars.',
)
@click.option(
    '-s',
    '--start',
    default=None,
    type=Date(tz='utc', as_timestamp=True),
    help='The start date of the data range. (default: one year from end date)',
)
@click.option(
    '-e',
    '--end',
    default=None,
    type=Date(tz='utc', as_timestamp=True),
    help='The end date of the data range. (default: today)',
)
@click.option(
    '-i',
    '--include-symbols',
    default=None,
    help='A list of symbols to ingest (optional comma separated list)',
)
@click.option(
    '--exclude-symbols',
    default=None,
    help='A list of symbols to exclude from the ingestion '
         '(optional comma separated list)',
)
@click.option(
    '--csv',
    default=None,
    help='The path of a CSV file containing the data. If specified, start, '
         'end, include-symbols and exclude-symbols will be ignored. Instead,'
         'all data in the file will be ingested.',
)
@click.option(
    '--show-progress/--no-show-progress',
    default=True,
    help='Print progress information to the terminal.'
)
@click.option(
    '--verbose/--no-verbose`',
    default=False,
    help='Show a progress indicator for every currency pair.'
)
@click.option(
    '--validate/--no-validate`',
    default=False,
    help='Report potential anomalies found in data bundles.'
)
@click.pass_context
def ingest_exchange(ctx, exchange_name, data_frequency, start, end,
                    include_symbols, exclude_symbols, csv, show_progress,
                    verbose, validate):
    """
    Ingest data for the given exchange.
    """

    if exchange_name is None:
        ctx.fail("must specify an exchange name '-x'")

    exchange_bundle = ExchangeBundle(exchange_name)

    click.echo('Ingesting exchange bundle {}...'.format(exchange_name))
    exchange_bundle.ingest(
        data_frequency=data_frequency,
        include_symbols=include_symbols,
        exclude_symbols=exclude_symbols,
        start=start,
        end=end,
        show_progress=show_progress,
        show_breakdown=verbose,
        show_report=validate,
        csv=csv
    )


@main.command(name='clean-algo')
@click.option(
    '-n',
    '--algo-namespace',
    help='The label of the algorithm to for which to clean the state.'
)
@click.pass_context
def clean_algo(ctx, algo_namespace):
    click.echo(
        'Cleaning algo state: {}'.format(algo_namespace)
    )
    delete_algo_folder(algo_namespace)
    click.echo('Done')


@main.command(name='clean-exchange')
@click.option(
    '-x',
    '--exchange-name',
    help='The name of the exchange bundle to ingest.',
)
@click.option(
    '-f',
    '--data-frequency',
    type=click.Choice({'daily', 'minute'}),
    default=None,
    help='The bundle data frequency to remove. If not specified, it will '
         'remove both daily and minute bundles.',
)
@click.pass_context
def clean_exchange(ctx, exchange_name, data_frequency):
    """Clean up bundles from 'ingest-exchange'.
    """

    if exchange_name is None:
        ctx.fail("must specify an exchange name '-x'")

    exchange_bundle = ExchangeBundle(exchange_name)

    click.echo('Cleaning exchange bundle {}...'.format(exchange_name))
    exchange_bundle.clean(
        data_frequency=data_frequency,
    )
    click.echo('Done')


@main.command()
@click.option(
    '-b',
    '--bundle',
    metavar='BUNDLE-NAME',
    default=None,
    show_default=False,
    help='The data bundle to ingest.',
)
@click.option(
    '-x',
    '--exchange-name',
    help='The name of the exchange bundle to ingest.',
)
@click.option(
    '-c',
    '--compile-locally',
    is_flag=True,
    default=False,
    help='Download dataset from source and compile bundle locally.',
)
@click.option(
    '--assets-version',
    type=int,
    multiple=True,
    help='Version of the assets db to which to downgrade.',
)
@click.option(
    '--show-progress/--no-show-progress',
    default=True,
    help='Print progress information to the terminal.'
)
@click.pass_context
def ingest(ctx, bundle, exchange_name, compile_locally, assets_version,
           show_progress):
    """Ingest the data for the given bundle.
    """

    bundles_module.ingest(
        bundle,
        os.environ,
        pd.Timestamp.utcnow(),
        assets_version,
        show_progress,
        compile_locally,
    )


@main.command()
@click.option(
    '-b',
    '--bundle',
    default='poloniex',
    metavar='BUNDLE-NAME',
    show_default=True,
    help='The data bundle to clean.',
)
@click.option(
    '-x',
    '--exchange_name',
    metavar='EXCHANGE-NAME',
    show_default=True,
    help='The exchange bundle name to clean.',
)
@click.option(
    '-e',
    '--before',
    type=Timestamp(),
    help='Clear all data before TIMESTAMP.'
         ' This may not be passed with -k / --keep-last',
)
@click.option(
    '-a',
    '--after',
    type=Timestamp(),
    help='Clear all data after TIMESTAMP'
         ' This may not be passed with -k / --keep-last',
)
@click.option(
    '-k',
    '--keep-last',
    type=int,
    metavar='N',
    help='Clear all but the last N downloads.'
         ' This may not be passed with -e / --before or -a / --after',
)
def clean(bundle, before, after, keep_last):
    """Clean up bundles from 'ingest'.
    """
    bundles_module.clean(
        bundle,
        before,
        after,
        keep_last,
    )


@main.command()
def bundles():
    """List all of the available data bundles.
    """
    for bundle in sorted(bundles_module.bundles.keys()):
        if bundle.startswith('.'):
            # hide the test data
            continue
        try:
            ingestions = list(
                map(text_type, bundles_module.ingestions_for_bundle(bundle))
            )
        except OSError as e:
            if e.errno != errno.ENOENT:
                raise
            ingestions = []

        # If we got no ingestions, either because the directory didn't exist or
        # because there were no entries, print a single message indicating that
        # no ingestions have yet been made.
        for timestamp in ingestions or ["<no ingestions>"]:
            click.echo("%s %s" % (bundle, timestamp))


if __name__ == '__main__':
    main()
