# -*- coding: utf-8 -*-
"""
    wakatime.main
    ~~~~~~~~~~~~~

    wakatime module entry point.

    :copyright: (c) 2013 Alan Hamlett.
    :license: BSD, see LICENSE for more details.
"""

from __future__ import print_function

import base64
import logging
import os
import platform
import re
import sys
import time
import traceback
import socket
try:
    import ConfigParser as configparser
except ImportError:  # pragma: nocover
    import configparser

pwd = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, os.path.dirname(pwd))
sys.path.insert(0, os.path.join(pwd, 'packages'))

from .__about__ import __version__
from .compat import u, open, is_py3
from .constants import (
    API_ERROR,
    AUTH_ERROR,
    CONFIG_FILE_PARSE_ERROR,
    SUCCESS,
    UNKNOWN_ERROR,
    MALFORMED_HEARTBEAT_ERROR,
)
from .logger import setup_logging
from .offlinequeue import Queue
from .packages import argparse
from .packages import requests
from .packages.requests.exceptions import RequestException
from .project import get_project_info
from .session_cache import SessionCache
from .stats import get_file_stats
try:
    from .packages import simplejson as json  # pragma: nocover
except (ImportError, SyntaxError):  # pragma: nocover
    import json
from .packages import tzlocal


log = logging.getLogger('WakaTime')


class FileAction(argparse.Action):

    def __call__(self, parser, namespace, values, option_string=None):
        try:
            if os.path.isfile(values):
                values = os.path.realpath(values)
        except:  # pragma: nocover
            pass
        setattr(namespace, self.dest, values)


def parseConfigFile(configFile=None):
    """Returns a configparser.SafeConfigParser instance with configs
    read from the config file. Default location of the config file is
    at ~/.wakatime.cfg.
    """

    # get config file location from ENV
    home = os.environ.get('WAKATIME_HOME')
    if not configFile and home:
        configFile = os.path.join(os.path.expanduser(home), '.wakatime.cfg')

    # use default config file location
    if not configFile:
        configFile = os.path.join(os.path.expanduser('~'), '.wakatime.cfg')

    configs = configparser.SafeConfigParser()
    try:
        with open(configFile, 'r', encoding='utf-8') as fh:
            try:
                configs.readfp(fh)
            except configparser.Error:
                print(traceback.format_exc())
                return None
    except IOError:
        sys.stderr.write(u("Error: Could not read from config file {0}\n").format(u(configFile)))
        raise SystemExit(CONFIG_FILE_PARSE_ERROR)
    return configs


def parseArguments():
    """Parse command line arguments and configs from ~/.wakatime.cfg.
    Command line arguments take precedence over config file settings.
    Returns instances of ArgumentParser and SafeConfigParser.
    """

    # define supported command line arguments
    parser = argparse.ArgumentParser(
            description='Common interface for the WakaTime api.')
    parser.add_argument('--entity', dest='entity', metavar='FILE',
            action=FileAction,
            help='absolute path to file for the heartbeat; can also be a '+
                 'url, domain, or app when --entity-type is not file')
    parser.add_argument('--file', dest='file', action=FileAction,
            help=argparse.SUPPRESS)
    parser.add_argument('--key', dest='key',
            help='your wakatime api key; uses api_key from '+
                '~/.wakatime.cfg by default')
    parser.add_argument('--write', dest='is_write',
            action='store_true',
            help='when set, tells api this heartbeat was triggered from '+
                 'writing to a file')
    parser.add_argument('--plugin', dest='plugin',
            help='optional text editor plugin name and version '+
                 'for User-Agent header')
    parser.add_argument('--time', dest='timestamp', metavar='time',
            type=float,
            help='optional floating-point unix epoch timestamp; '+
                 'uses current time by default')
    parser.add_argument('--lineno', dest='lineno',
            help='optional line number; current line being edited')
    parser.add_argument('--cursorpos', dest='cursorpos',
            help='optional cursor position in the current file')
    parser.add_argument('--entity-type', dest='entity_type',
            help='entity type for this heartbeat. can be one of "file", '+
                 '"domain", or "app"; defaults to file.')
    parser.add_argument('--proxy', dest='proxy',
                        help='optional proxy configuration. Supports HTTPS '+
                        'and SOCKS proxies. For example: '+
                        'https://user:pass@host:port or '+
                        'socks5://user:pass@host:port or ' +
                        'domain\\user:pass')
    parser.add_argument('--project', dest='project',
            help='optional project name')
    parser.add_argument('--alternate-project', dest='alternate_project',
            help='optional alternate project name; auto-discovered project '+
                 'takes priority')
    parser.add_argument('--alternate-language', dest='alternate_language',
            help='optional alternate language name; auto-detected language'+
                 'takes priority')
    parser.add_argument('--hostname', dest='hostname', help='hostname of '+
                        'current machine.')
    parser.add_argument('--disableoffline', dest='offline',
            action='store_false',
            help='disables offline time logging instead of queuing logged time')
    parser.add_argument('--hidefilenames', dest='hidefilenames',
            action='store_true',
            help='obfuscate file names; will not send file names to api')
    parser.add_argument('--exclude', dest='exclude', action='append',
            help='filename patterns to exclude from logging; POSIX regex '+
                 'syntax; can be used more than once')
    parser.add_argument('--include', dest='include', action='append',
            help='filename patterns to log; when used in combination with '+
                 '--exclude, files matching include will still be logged; '+
                 'POSIX regex syntax; can be used more than once')
    parser.add_argument('--ignore', dest='ignore', action='append',
            help=argparse.SUPPRESS)
    parser.add_argument('--extra-heartbeats', dest='extra_heartbeats',
            action='store_true',
            help='reads extra heartbeats from STDIN as a JSON array until EOF')
    parser.add_argument('--logfile', dest='logfile',
            help='defaults to ~/.wakatime.log')
    parser.add_argument('--apiurl', dest='api_url',
            help='heartbeats api url; for debugging with a local server')
    parser.add_argument('--timeout', dest='timeout', type=int,
            help='number of seconds to wait when sending heartbeats to api; '+
                 'defaults to 60 seconds')
    parser.add_argument('--config', dest='config',
            help='defaults to ~/.wakatime.cfg')
    parser.add_argument('--verbose', dest='verbose', action='store_true',
            help='turns on debug messages in log file')
    parser.add_argument('--version', action='version', version=__version__)

    # parse command line arguments
    args = parser.parse_args()

    # use current unix epoch timestamp by default
    if not args.timestamp:
        args.timestamp = time.time()

    # parse ~/.wakatime.cfg file
    configs = parseConfigFile(args.config)
    if configs is None:
        return args, configs

    # update args from configs
    if not args.hostname:
        if configs.has_option('settings', 'hostname'):
            args.hostname = configs.get('settings', 'hostname')
    if not args.key:
        default_key = None
        if configs.has_option('settings', 'api_key'):
            default_key = configs.get('settings', 'api_key')
        elif configs.has_option('settings', 'apikey'):
            default_key = configs.get('settings', 'apikey')
        if default_key:
            args.key = default_key
        else:
            try:
                parser.error('Missing api key. Find your api key from wakatime.com/settings.')
            except SystemExit:
                raise SystemExit(AUTH_ERROR)

    is_valid = not not re.match(r'^[a-f0-9]{8}-[a-f0-9]{4}-4[a-f0-9]{3}-[89ab][a-f0-9]{3}-[a-f0-9]{12}$', args.key, re.I)
    if not is_valid:
        try:
            parser.error('Invalid api key. Find your api key from wakatime.com/settings.')
        except SystemExit:
            raise SystemExit(AUTH_ERROR)

    if not args.entity:
        if args.file:
            args.entity = args.file
        else:
            parser.error('argument --entity is required')
    if not args.exclude:
        args.exclude = []
    if configs.has_option('settings', 'ignore'):
        try:
            for pattern in configs.get('settings', 'ignore').split("\n"):
                if pattern.strip() != '':
                    args.exclude.append(pattern)
        except TypeError:  # pragma: nocover
            pass
    if configs.has_option('settings', 'exclude'):
        try:
            for pattern in configs.get('settings', 'exclude').split("\n"):
                if pattern.strip() != '':
                    args.exclude.append(pattern)
        except TypeError:  # pragma: nocover
            pass
    if not args.include:
        args.include = []
    if configs.has_option('settings', 'include'):
        try:
            for pattern in configs.get('settings', 'include').split("\n"):
                if pattern.strip() != '':
                    args.include.append(pattern)
        except TypeError:  # pragma: nocover
            pass
    if args.hidefilenames:
        args.hidefilenames = ['.*']
    else:
        args.hidefilenames = []
        if configs.has_option('settings', 'hidefilenames'):
            option = configs.get('settings', 'hidefilenames')
            if option.strip().lower() == 'true':
                args.hidefilenames = ['.*']
            elif option.strip().lower() != 'false':
                for pattern in option.split("\n"):
                    if pattern.strip() != '':
                        args.hidefilenames.append(pattern)
    if args.offline and configs.has_option('settings', 'offline'):
        args.offline = configs.getboolean('settings', 'offline')
    if not args.proxy and configs.has_option('settings', 'proxy'):
        args.proxy = configs.get('settings', 'proxy')
    if args.proxy:
        pattern = r'^((https?|socks5)://)?([^:@]+(:([^:@])+)?@)?[^:]+(:\d+)?$'
        if '\\' in args.proxy:
            pattern = r'^.*\\.+$'
        is_valid = not not re.match(pattern, args.proxy, re.I)
        if not is_valid:
            parser.error('Invalid proxy. Must be in format ' +
                            'https://user:pass@host:port or ' +
                            'socks5://user:pass@host:port or ' +
                            'domain\\user:pass.')
    if not args.verbose and configs.has_option('settings', 'verbose'):
        args.verbose = configs.getboolean('settings', 'verbose')
    if not args.verbose and configs.has_option('settings', 'debug'):
        args.verbose = configs.getboolean('settings', 'debug')
    if not args.logfile and configs.has_option('settings', 'logfile'):
        args.logfile = configs.get('settings', 'logfile')
    if not args.logfile and os.environ.get('WAKATIME_HOME'):
        home = os.environ.get('WAKATIME_HOME')
        args.logfile = os.path.join(os.path.expanduser(home), '.wakatime.log')
    if not args.api_url and configs.has_option('settings', 'api_url'):
        args.api_url = configs.get('settings', 'api_url')
    if not args.timeout and configs.has_option('settings', 'timeout'):
        try:
            args.timeout = int(configs.get('settings', 'timeout'))
        except ValueError:
            print(traceback.format_exc())

    return args, configs


def should_exclude(entity, include, exclude):
    if entity is not None and entity.strip() != '':
        for pattern in include:
            try:
                compiled = re.compile(pattern, re.IGNORECASE)
                if compiled.search(entity):
                    return False
            except re.error as ex:
                log.warning(u('Regex error ({msg}) for include pattern: {pattern}').format(
                    msg=u(ex),
                    pattern=u(pattern),
                ))
        for pattern in exclude:
            try:
                compiled = re.compile(pattern, re.IGNORECASE)
                if compiled.search(entity):
                    return pattern
            except re.error as ex:
                log.warning(u('Regex error ({msg}) for exclude pattern: {pattern}').format(
                    msg=u(ex),
                    pattern=u(pattern),
                ))
    return False


def get_user_agent(plugin):
    ver = sys.version_info
    python_version = '%d.%d.%d.%s.%d' % (ver[0], ver[1], ver[2], ver[3], ver[4])
    user_agent = u('wakatime/{ver} ({platform}) Python{py_ver}').format(
        ver=u(__version__),
        platform=u(platform.platform()),
        py_ver=python_version,
    )
    if plugin:
        user_agent = u('{user_agent} {plugin}').format(
            user_agent=user_agent,
            plugin=u(plugin),
        )
    else:
        user_agent = u('{user_agent} Unknown/0').format(
            user_agent=user_agent,
        )
    return user_agent


def send_heartbeat(project=None, branch=None, hostname=None, stats={}, key=None,
                   entity=None, timestamp=None, is_write=None, plugin=None,
                   offline=None, entity_type='file', hidefilenames=None,
                   proxy=None, api_url=None, timeout=None, **kwargs):
    """Sends heartbeat as POST request to WakaTime api server.

    Returns `SUCCESS` when heartbeat was sent, otherwise returns an
    error code constant.
    """

    if not api_url:
        api_url = 'https://api.wakatime.com/api/v1/heartbeats'
    if not timeout:
        timeout = 60
    log.debug('Sending heartbeat to api at %s' % api_url)
    data = {
        'time': timestamp,
        'entity': entity,
        'type': entity_type,
    }
    if hidefilenames and entity is not None and entity_type == 'file':
        for pattern in hidefilenames:
            try:
                compiled = re.compile(pattern, re.IGNORECASE)
                if compiled.search(entity):
                    extension = u(os.path.splitext(data['entity'])[1])
                    data['entity'] = u('HIDDEN{0}').format(extension)
                    break
            except re.error as ex:
                log.warning(u('Regex error ({msg}) for include pattern: {pattern}').format(
                    msg=u(ex),
                    pattern=u(pattern),
                ))
    if stats.get('lines'):
        data['lines'] = stats['lines']
    if stats.get('language'):
        data['language'] = stats['language']
    if stats.get('dependencies'):
        data['dependencies'] = stats['dependencies']
    if stats.get('lineno'):
        data['lineno'] = stats['lineno']
    if stats.get('cursorpos'):
        data['cursorpos'] = stats['cursorpos']
    if is_write:
        data['is_write'] = is_write
    if project:
        data['project'] = project
    if branch:
        data['branch'] = branch
    log.debug(data)

    # setup api request
    request_body = json.dumps(data)
    api_key = u(base64.b64encode(str.encode(key) if is_py3 else key))
    auth = u('Basic {api_key}').format(api_key=api_key)
    headers = {
        'User-Agent': get_user_agent(plugin),
        'Content-Type': 'application/json',
        'Accept': 'application/json',
        'Authorization': auth,
    }
    if hostname:
        headers['X-Machine-Name'] = u(hostname).encode('utf-8')

    # add Olson timezone to request
    try:
        tz = tzlocal.get_localzone()
    except:
        tz = None
    if tz:
        headers['TimeZone'] = u(tz.zone).encode('utf-8')

    session_cache = SessionCache()
    session = session_cache.get()

    proxies = {}
    if proxy:
        if '\\' in proxy:
            from .packages.requests_ntlm import HttpNtlmAuth
            username = proxy.rsplit(':', 1)
            password = ''
            if len(username) == 2:
                password = username[1]
            username = username[0]
            session.auth = HttpNtlmAuth(username, password, session)
        else:
            proxies['https'] = proxy

    # log time to api
    response = None
    try:
        response = session.post(api_url, data=request_body, headers=headers,
                                proxies=proxies, timeout=timeout)
    except RequestException:
        exception_data = {
            sys.exc_info()[0].__name__: u(sys.exc_info()[1]),
        }
        if log.isEnabledFor(logging.DEBUG):
            exception_data['traceback'] = traceback.format_exc()
        if offline:
            queue = Queue()
            queue.push(data, json.dumps(stats), plugin)
            if log.isEnabledFor(logging.DEBUG):
                log.warn(exception_data)
        else:
            log.error(exception_data)

    except:  # delete cached session when requests raises unknown exception
        exception_data = {
            sys.exc_info()[0].__name__: u(sys.exc_info()[1]),
            'traceback': traceback.format_exc(),
        }
        if offline:
            queue = Queue()
            queue.push(data, json.dumps(stats), plugin)
            log.warn(exception_data)
        session_cache.delete()

    else:
        code = response.status_code if response is not None else None
        content = response.text if response is not None else None
        if code == requests.codes.created or code == requests.codes.accepted:
            log.debug({
                'response_code': code,
            })
            session_cache.save(session)
            return SUCCESS
        if offline:
            if code != 400:
                queue = Queue()
                queue.push(data, json.dumps(stats), plugin)
                if code == 401:
                    log.error({
                        'response_code': code,
                        'response_content': content,
                    })
                    session_cache.delete()
                    return AUTH_ERROR
                elif log.isEnabledFor(logging.DEBUG):
                    log.warn({
                        'response_code': code,
                        'response_content': content,
                    })
            else:
                log.error({
                    'response_code': code,
                    'response_content': content,
                })
        else:
            log.error({
                'response_code': code,
                'response_content': content,
            })
    session_cache.delete()
    return API_ERROR


def sync_offline_heartbeats(args, hostname):
    """Sends all heartbeats which were cached in the offline Queue."""

    queue = Queue()
    while True:
        heartbeat = queue.pop()
        if heartbeat is None:
            break
        status = send_heartbeat(
            project=heartbeat['project'],
            entity=heartbeat['entity'],
            timestamp=heartbeat['time'],
            branch=heartbeat['branch'],
            hostname=hostname,
            stats=json.loads(heartbeat['stats']),
            key=args.key,
            is_write=heartbeat['is_write'],
            plugin=heartbeat['plugin'],
            offline=args.offline,
            hidefilenames=args.hidefilenames,
            entity_type=heartbeat['type'],
            proxy=args.proxy,
            api_url=args.api_url,
            timeout=args.timeout,
        )
        if status != SUCCESS:
            if status == AUTH_ERROR:
                return AUTH_ERROR
            break
    return SUCCESS


def format_file_path(filepath):
    """Formats a path as absolute and with the correct platform separator."""

    try:
        filepath = os.path.realpath(os.path.abspath(filepath))
        filepath = re.sub(r'[/\\]', os.path.sep, filepath)
    except:  # pragma: nocover
        pass
    return filepath


def process_heartbeat(args, configs, hostname, heartbeat):
    exclude = should_exclude(heartbeat['entity'], args.include, args.exclude)
    if exclude is not False:
        log.debug(u('Skipping because matches exclude pattern: {pattern}').format(
            pattern=u(exclude),
        ))
        return SUCCESS

    if heartbeat.get('entity_type') not in ['file', 'domain', 'app']:
        heartbeat['entity_type'] = 'file'

    if heartbeat['entity_type'] == 'file':
        heartbeat['entity'] = format_file_path(heartbeat['entity'])

    if heartbeat['entity_type'] != 'file' or os.path.isfile(heartbeat['entity']):

        stats = get_file_stats(heartbeat['entity'],
                                entity_type=heartbeat['entity_type'],
                                lineno=heartbeat.get('lineno'),
                                cursorpos=heartbeat.get('cursorpos'),
                                plugin=args.plugin,
                                alternate_language=heartbeat.get('alternate_language'))

        project = heartbeat.get('project') or heartbeat.get('alternate_project')
        branch = None
        if heartbeat['entity_type'] == 'file':
            project, branch = get_project_info(configs, heartbeat)

        heartbeat['project'] = project
        heartbeat['branch'] = branch
        heartbeat['stats'] = stats
        heartbeat['hostname'] = hostname
        heartbeat['timeout'] = args.timeout
        heartbeat['key'] = args.key
        heartbeat['plugin'] = args.plugin
        heartbeat['offline'] = args.offline
        heartbeat['hidefilenames'] = args.hidefilenames
        heartbeat['proxy'] = args.proxy
        heartbeat['api_url'] = args.api_url

        return send_heartbeat(**heartbeat)

    else:
        log.debug('File does not exist; ignoring this heartbeat.')
        return SUCCESS


def execute(argv=None):
    if argv:
        sys.argv = ['wakatime'] + argv

    args, configs = parseArguments()
    if configs is None:
        return CONFIG_FILE_PARSE_ERROR

    setup_logging(args, __version__)

    try:

        hostname = args.hostname or socket.gethostname()

        heartbeat = vars(args)
        retval = process_heartbeat(args, configs, hostname, heartbeat)

        if args.extra_heartbeats:
            try:
                for heartbeat in json.loads(sys.stdin.readline()):
                    retval = process_heartbeat(args, configs, hostname, heartbeat)
            except json.JSONDecodeError:
                retval = MALFORMED_HEARTBEAT_ERROR

        if retval == SUCCESS:
            retval = sync_offline_heartbeats(args, hostname)

        return retval

    except:
        log.traceback(logging.ERROR)
        print(traceback.format_exc())
        return UNKNOWN_ERROR