import argparse
import json
import os
import sys

from lbrynet import conf
from lbrynet.core import utils
from lbrynet.lbrynet_daemon.auth.client import JSONRPCException, LBRYAPIClient
from lbrynet.lbrynet_daemon.Daemon import LOADING_WALLET_CODE
from jsonrpc.common import RPCError
from urllib2 import URLError, HTTPError
from httplib import UNAUTHORIZED


def main():
    parser = argparse.ArgumentParser(add_help=False)
    _, arguments = parser.parse_known_args()

    conf.initialize_settings()
    api = LBRYAPIClient.get_client()

    try:
        status = api.status()
    except URLError as err:
        if isinstance(err, HTTPError) and err.code == UNAUTHORIZED:
            print_error("Daemon requires authentication, but none was provided.",
                        suggest_help=False)
        else:
            print_error("Could not connect to daemon. Are you sure it's running?",
                        suggest_help=False)
        return 1

    if status['startup_status']['code'] != "started":
        print "Daemon is in the process of starting. Please try again in a bit."
        message = status['startup_status']['message']
        if message:
            if (
                status['startup_status']['code'] == LOADING_WALLET_CODE
                and status['blockchain_status']['blocks_behind'] > 0
            ):
                message += '. Blocks left: ' + str(status['blockchain_status']['blocks_behind'])
            print "  Status: " + message
        return 1

    if len(arguments) < 1:
        print_help(api)
        return 1

    method = arguments[0]
    try:
        params = parse_params(arguments[1:])
    except InvalidParameters as e:
        print_error(e.message)
        return 1

    # TODO: check if port is bound. Error if its not

    if method in ['--help', '-h', 'help']:
        if len(params) == 0:
            print_help(api)
        elif 'command' not in params:
            print_error(
                'To get help on a specific command, use `{} help command=COMMAND_NAME`'.format(
                    os.path.basename(sys.argv[0]))
            )
        else:
            print_help_response(api.call('help', params))

    elif method not in api.commands():
        print_error("'" + method + "' is not a valid command.")

    else:
        try:
            result = api.call(method, params)
            if isinstance(result, basestring):
                # printing the undumped string is prettier
                print result
            else:
                print utils.json_dumps_pretty(result)
        except (RPCError, KeyError, JSONRPCException) as err:
            # TODO: The api should return proper error codes
            # and messages so that they can be passed along to the user
            # instead of this generic message.
            # https://app.asana.com/0/158602294500137/200173944358192
            print "Something went wrong, here's the usage for %s:" % method
            print_help_response(api.call('help', {'command': method}))
            if hasattr(err, 'msg'):
                print "Here's the traceback for the error you encountered:"
                print err.msg
            return 1


def print_help_response(help_response):
    print help_response['help'] if 'help' in help_response else help_response

def guess_type(x):
    if '.' in x:
        try:
            return float(x)
        except ValueError:
            # not a float
            pass
    try:
        return int(x)
    except ValueError:
        return x


def parse_params(params):
    if len(params) > 1:
        return get_params_from_kwargs(params)
    elif len(params) == 1:
        try:
            return json.loads(params[0])
        except ValueError:
            return get_params_from_kwargs(params)
    else:
        return {}


class InvalidParameters(Exception):
    pass


def get_params_from_kwargs(params):
    params_for_return = {}
    for i in params:
        try:
            eq_pos = i.index('=')
        except ValueError:
            raise InvalidParameters('{} is not in <key>=<value> format'.format(i))
        k, v = i[:eq_pos], i[eq_pos + 1:]
        params_for_return[k] = guess_type(v)
    return params_for_return


def print_help_suggestion():
    print "See `{} help` for more information.".format(os.path.basename(sys.argv[0]))


def print_error(message, suggest_help=True):
    print "ERROR: " + message
    if suggest_help:
        print_help_suggestion()


def print_help(api):
    print "\n".join([
        "NAME",
        "   lbrynet-cli - LBRY command line client.",
        "",
        "USAGE",
        "   lbrynet-cli <command> [<args>]",
        "",
        "EXAMPLES",
        "   lbrynet-cli commands                   # list available commands",
        "   lbrynet-cli status                     # get daemon status",
        "   lbrynet-cli resolve_name name=what     # resolve a name",
        "   lbrynet-cli help command=resolve_name  # get help for a command",
        "",
        "COMMANDS",
        wrap_list_to_term_width(api.commands(), prefix='   ')
    ])


def wrap_list_to_term_width(l, width=None, separator=', ', prefix=''):
    if width is None:
        try:
            _, width = os.popen('stty size', 'r').read().split()
            width = int(width)
        except:
            pass
        if not width:
            width = 80

    lines = []
    curr_line = ''
    for item in l:
        new_line = curr_line + item + separator
        if len(new_line) + len(prefix) > width:
            lines.append(curr_line)
            curr_line = item + separator
        else:
            curr_line = new_line
    lines.append(curr_line)

    ret = prefix + ("\n" + prefix).join(lines)
    if ret.endswith(separator):
        ret = ret[:-len(separator)]
    return ret


if __name__ == '__main__':
    sys.exit(main())