""" ==========================================================
File:        WakaTime.py
Description: Automatic time tracking for Sublime Text 2 and 3.
Maintainer:  WakaTime <support@wakatime.com>
License:     BSD, see LICENSE for more details.
Website:     https://wakatime.com/
==========================================================="""


__version__ = '5.0.0'


import sublime
import sublime_plugin

import os
import platform
import re
import sys
import time
import threading
import urllib
import webbrowser
from datetime import datetime
from subprocess import Popen
try:
    import _winreg as winreg  # py2
except ImportError:
    try:
        import winreg  # py3
    except ImportError:
        winreg = None


# globals
HEARTBEAT_FREQUENCY = 2
ST_VERSION = int(sublime.version())
PLUGIN_DIR = os.path.dirname(os.path.realpath(__file__))
API_CLIENT = os.path.join(PLUGIN_DIR, 'packages', 'wakatime', 'cli.py')
SETTINGS_FILE = 'WakaTime.sublime-settings'
SETTINGS = {}
LAST_HEARTBEAT = {
    'time': 0,
    'file': None,
    'is_write': False,
}
LOCK = threading.RLock()
PYTHON_LOCATION = None


# Log Levels
DEBUG = 'DEBUG'
INFO = 'INFO'
WARNING = 'WARNING'
ERROR = 'ERROR'


# add wakatime package to path
sys.path.insert(0, os.path.join(PLUGIN_DIR, 'packages'))
try:
    from wakatime.base import parseConfigFile
except ImportError:
    pass


def log(lvl, message, *args, **kwargs):
    try:
        if lvl == DEBUG and not SETTINGS.get('debug'):
            return
        msg = message
        if len(args) > 0:
            msg = message.format(*args)
        elif len(kwargs) > 0:
            msg = message.format(**kwargs)
        print('[WakaTime] [{lvl}] {msg}'.format(lvl=lvl, msg=msg))
    except RuntimeError:
        sublime.set_timeout(lambda: log(lvl, message, *args, **kwargs), 0)


def createConfigFile():
    """Creates the .wakatime.cfg INI file in $HOME directory, if it does
    not already exist.
    """
    configFile = os.path.join(os.path.expanduser('~'), '.wakatime.cfg')
    try:
        with open(configFile) as fh:
            pass
    except IOError:
        try:
            with open(configFile, 'w') as fh:
                fh.write("[settings]\n")
                fh.write("debug = false\n")
                fh.write("hidefilenames = false\n")
        except IOError:
            pass


def prompt_api_key():
    global SETTINGS

    createConfigFile()

    default_key = ''
    try:
        configs = parseConfigFile()
        if configs is not None:
            if configs.has_option('settings', 'api_key'):
                default_key = configs.get('settings', 'api_key')
    except:
        pass

    if SETTINGS.get('api_key'):
        return True
    else:
        def got_key(text):
            if text:
                SETTINGS.set('api_key', str(text))
                sublime.save_settings(SETTINGS_FILE)
        window = sublime.active_window()
        if window:
            window.show_input_panel('[WakaTime] Enter your wakatime.com api key:', default_key, got_key, None, None)
            return True
        else:
            log(ERROR, 'Could not prompt for api key because no window found.')
    return False


def python_binary():
    if PYTHON_LOCATION is not None:
        return PYTHON_LOCATION

    # look for python in PATH and common install locations
    paths = [
        '/',
        '/usr/local/bin/',
        '/usr/bin/',
    ]
    for path in paths:
        path = find_python_in_folder(path)
        if path is not None:
            set_python_binary_location(path)
            return path

    # look for python in windows registry
    path = find_python_from_registry(r'SOFTWARE\Python\PythonCore')
    if path is not None:
        set_python_binary_location(path)
        return path
    path = find_python_from_registry(r'SOFTWARE\Wow6432Node\Python\PythonCore')
    if path is not None:
        set_python_binary_location(path)
        return path

    return None


def set_python_binary_location(path):
    global PYTHON_LOCATION
    PYTHON_LOCATION = path
    log(DEBUG, 'Python Binary Found: {0}'.format(path))


def find_python_from_registry(location, reg=None):
    if platform.system() != 'Windows' or winreg is None:
        return None

    if reg is None:
        path = find_python_from_registry(location, reg=winreg.HKEY_CURRENT_USER)
        if path is None:
            path = find_python_from_registry(location, reg=winreg.HKEY_LOCAL_MACHINE)
        return path

    val = None
    sub_key = 'InstallPath'
    compiled = re.compile(r'^\d+\.\d+$')

    try:
        with winreg.OpenKey(reg, location) as handle:
            versions = []
            try:
                for index in range(1024):
                    version = winreg.EnumKey(handle, index)
                    try:
                        if compiled.search(version):
                            versions.append(version)
                    except re.error:
                        pass
            except EnvironmentError:
                pass
            versions.sort(reverse=True)
            for version in versions:
                try:
                    path = winreg.QueryValue(handle, version + '\\' + sub_key)
                    if path is not None:
                        path = find_python_in_folder(path)
                        if path is not None:
                            log(DEBUG, 'Found python from {reg}\\{key}\\{version}\\{sub_key}.'.format(
                                reg=reg,
                                key=location,
                                version=version,
                                sub_key=sub_key,
                            ))
                            return path
                except WindowsError:
                    log(DEBUG, 'Could not read registry value "{reg}\\{key}\\{version}\\{sub_key}".'.format(
                        reg=reg,
                        key=location,
                        version=version,
                        sub_key=sub_key,
                    ))
    except WindowsError:
        if SETTINGS.get('debug'):
            log(DEBUG, 'Could not read registry value "{reg}\\{key}".'.format(
                reg=reg,
                key=location,
            ))

    return val


def find_python_in_folder(folder):
    path = os.path.realpath(os.path.join(folder, 'pythonw'))
    try:
        Popen([path, '--version'])
        return path
    except:
        pass
    path = os.path.realpath(os.path.join(folder, 'python'))
    try:
        Popen([path, '--version'])
        return path
    except:
        pass
    return None


def obfuscate_apikey(command_list):
    cmd = list(command_list)
    apikey_index = None
    for num in range(len(cmd)):
        if cmd[num] == '--key':
            apikey_index = num + 1
            break
    if apikey_index is not None and apikey_index < len(cmd):
        cmd[apikey_index] = 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXX' + cmd[apikey_index][-4:]
    return cmd


def enough_time_passed(now, last_heartbeat, is_write):
    if now - last_heartbeat['time'] > HEARTBEAT_FREQUENCY * 60:
        return True
    if is_write and now - last_heartbeat['time'] > 2:
        return True
    return False


def find_folder_containing_file(folders, current_file):
    """Returns absolute path to folder containing the file.
    """

    parent_folder = None

    current_folder = current_file
    while True:
        for folder in folders:
            if os.path.realpath(os.path.dirname(current_folder)) == os.path.realpath(folder):
                parent_folder = folder
                break
        if parent_folder is not None:
            break
        if not current_folder or os.path.dirname(current_folder) == current_folder:
            break
        current_folder = os.path.dirname(current_folder)

    return parent_folder


def find_project_from_folders(folders, current_file):
    """Find project name from open folders.
    """

    folder = find_folder_containing_file(folders, current_file)
    return os.path.basename(folder) if folder else None


def is_view_active(view):
    if view:
        active_window = sublime.active_window()
        if active_window:
            active_view = active_window.active_view()
            if active_view:
                return active_view.buffer_id() == view.buffer_id()
    return False


def handle_heartbeat(view, is_write=False):
    window = view.window()
    if window is not None:
        target_file = view.file_name()
        project = window.project_data() if hasattr(window, 'project_data') else None
        folders = window.folders()
        thread = SendHeartbeatThread(target_file, view, is_write=is_write, project=project, folders=folders)
        thread.start()


class SendHeartbeatThread(threading.Thread):
    """Non-blocking thread for sending heartbeats to api.
    """

    def __init__(self, target_file, view, is_write=False, project=None, folders=None, force=False):
        threading.Thread.__init__(self)
        self.lock = LOCK
        self.target_file = target_file
        self.is_write = is_write
        self.project = project
        self.folders = folders
        self.force = force
        self.debug = SETTINGS.get('debug')
        self.api_key = SETTINGS.get('api_key', '')
        self.ignore = SETTINGS.get('ignore', [])
        self.last_heartbeat = LAST_HEARTBEAT.copy()
        self.cursorpos = view.sel()[0].begin() if view.sel() else None
        self.view = view

    def run(self):
        with self.lock:
            if self.target_file:
                self.timestamp = time.time()
                if self.force or self.target_file != self.last_heartbeat['file'] or enough_time_passed(self.timestamp, self.last_heartbeat, self.is_write):
                    self.send_heartbeat()

    def send_heartbeat(self):
        if not self.api_key:
            log(ERROR, 'missing api key.')
            return
        ua = 'sublime/%d sublime-wakatime/%s' % (ST_VERSION, __version__)
        cmd = [
            API_CLIENT,
            '--file', self.target_file,
            '--time', str('%f' % self.timestamp),
            '--plugin', ua,
            '--key', str(bytes.decode(self.api_key.encode('utf8'))),
        ]
        if self.is_write:
            cmd.append('--write')
        if self.project and self.project.get('name'):
            cmd.extend(['--alternate-project', self.project.get('name')])
        elif self.folders:
            project_name = find_project_from_folders(self.folders, self.target_file)
            if project_name:
                cmd.extend(['--alternate-project', project_name])
        if self.cursorpos is not None:
            cmd.extend(['--cursorpos', '{0}'.format(self.cursorpos)])
        for pattern in self.ignore:
            cmd.extend(['--ignore', pattern])
        if self.debug:
            cmd.append('--verbose')
        if python_binary():
            cmd.insert(0, python_binary())
            log(DEBUG, ' '.join(obfuscate_apikey(cmd)))
            if platform.system() == 'Windows':
                Popen(cmd, shell=False)
            else:
                with open(os.path.join(os.path.expanduser('~'), '.wakatime.log'), 'a') as stderr:
                    Popen(cmd, stderr=stderr)
            self.sent()
        else:
            log(ERROR, 'Unable to find python binary.')

    def sent(self):
        sublime.set_timeout(self.set_status_bar, 0)
        sublime.set_timeout(self.set_last_heartbeat, 0)

    def set_status_bar(self):
        if SETTINGS.get('status_bar_message'):
            self.view.set_status('wakatime', datetime.now().strftime(SETTINGS.get('status_bar_message_fmt')))

    def set_last_heartbeat(self):
        global LAST_HEARTBEAT
        LAST_HEARTBEAT = {
            'file': self.target_file,
            'time': self.timestamp,
            'is_write': self.is_write,
        }


class InstallPython(threading.Thread):
    """Non-blocking thread for installing Python on Windows machines.
    """

    def run(self):
        log(INFO, 'Downloading and installing python...')
        url = 'https://www.python.org/ftp/python/3.4.3/python-3.4.3.msi'
        if platform.architecture()[0] == '64bit':
            url = 'https://www.python.org/ftp/python/3.4.3/python-3.4.3.amd64.msi'
        python_msi = os.path.join(os.path.expanduser('~'), 'python.msi')
        try:
            urllib.urlretrieve(url, python_msi)
        except AttributeError:
            urllib.request.urlretrieve(url, python_msi)
        args = [
            'msiexec',
            '/i',
            python_msi,
            '/norestart',
            '/qb!',
        ]
        Popen(args)


def plugin_loaded():
    global SETTINGS
    log(INFO, 'Initializing WakaTime plugin v%s' % __version__)

    SETTINGS = sublime.load_settings(SETTINGS_FILE)

    if not python_binary():
        log(WARNING, 'Python binary not found.')
        if platform.system() == 'Windows':
            thread = InstallPython()
            thread.start()
        else:
            sublime.error_message("Unable to find Python binary!\nWakaTime needs Python to work correctly.\n\nGo to https://www.python.org/downloads")
            return

    after_loaded()


def after_loaded():
    if not prompt_api_key():
        sublime.set_timeout(after_loaded, 500)


# need to call plugin_loaded because only ST3 will auto-call it
if ST_VERSION < 3000:
    plugin_loaded()


class WakatimeListener(sublime_plugin.EventListener):

    def on_post_save(self, view):
        handle_heartbeat(view, is_write=True)

    def on_selection_modified(self, view):
        if is_view_active(view):
            handle_heartbeat(view)

    def on_modified(self, view):
        if is_view_active(view):
            handle_heartbeat(view)


class WakatimeDashboardCommand(sublime_plugin.ApplicationCommand):

    def run(self):
        webbrowser.open_new_tab('https://wakatime.com/dashboard')