__filename__ = "happening.py"
__author__ = "Bob Mottram"
__license__ = "AGPL3+"
__version__ = "1.1.0"
__maintainer__ = "Bob Mottram"
__email__ = "bob@freedombone.net"
__status__ = "Production"

import os
from datetime import datetime

from utils import loadJson
from utils import locatePost
from utils import daysInMonth
from utils import mergeDicts


def isHappeningEvent(tag: {}) -> bool:
    """Is this tag an Event or Place ActivityStreams type?
    """
    if not tag.get('type'):
        return False
    if tag['type'] != 'Event' and tag['type'] != 'Place':
        return False
    return True


def isHappeningPost(postJsonObject: {}) -> bool:
    """Is this a post with tags?
    """
    if not postJsonObject:
        return False
    if not postJsonObject.get('object'):
        return False
    if not isinstance(postJsonObject['object'], dict):
        return False
    if not postJsonObject['object'].get('tag'):
        return False
    return True


def getTodaysEvents(baseDir: str, nickname: str, domain: str,
                    currYear=None, currMonthNumber=None,
                    currDayOfMonth=None) -> {}:
    """Retrieves calendar events for today
    Returns a dictionary of lists containing Event and Place activities
    """
    now = datetime.now()
    if not currYear:
        year = now.year
    else:
        year = currYear
    if not currMonthNumber:
        monthNumber = now.month
    else:
        monthNumber = currMonthNumber
    if not currDayOfMonth:
        dayNumber = now.day
    else:
        dayNumber = currDayOfMonth

    calendarFilename = \
        baseDir + '/accounts/' + nickname + '@' + domain + \
        '/calendar/' + str(year) + '/' + str(monthNumber) + '.txt'
    events = {}
    if not os.path.isfile(calendarFilename):
        return events

    calendarPostIds = []
    recreateEventsFile = False
    with open(calendarFilename, 'r') as eventsFile:
        for postId in eventsFile:
            postId = postId.replace('\n', '').replace('\r', '')
            postFilename = locatePost(baseDir, nickname, domain, postId)
            if not postFilename:
                recreateEventsFile = True
                continue

            postJsonObject = loadJson(postFilename)
            if not isHappeningPost(postJsonObject):
                continue

            postEvent = []
            dayOfMonth = None
            for tag in postJsonObject['object']['tag']:
                if not isHappeningEvent(tag):
                    continue
                # this tag is an event or a place
                if tag['type'] == 'Event':
                    # tag is an event
                    if not tag.get('startTime'):
                        continue
                    eventTime = \
                        datetime.strptime(tag['startTime'],
                                          "%Y-%m-%dT%H:%M:%S%z")
                    if int(eventTime.strftime("%Y")) == year and \
                       int(eventTime.strftime("%m")) == monthNumber and \
                       int(eventTime.strftime("%d")) == dayNumber:
                        dayOfMonth = str(int(eventTime.strftime("%d")))
                        if '#statuses#' in postId:
                            # link to the id so that the event can be
                            # easily deleted
                            tag['postId'] = postId.split('#statuses#')[1]
                        postEvent.append(tag)
                else:
                    # tag is a place
                    postEvent.append(tag)
            if postEvent and dayOfMonth:
                calendarPostIds.append(postId)
                if not events.get(dayOfMonth):
                    events[dayOfMonth] = []
                events[dayOfMonth].append(postEvent)

    # if some posts have been deleted then regenerate the calendar file
    if recreateEventsFile:
        calendarFile = open(calendarFilename, "w")
        for postId in calendarPostIds:
            calendarFile.write(postId + '\n')
        calendarFile.close()

    return events


def todaysEventsCheck(baseDir: str, nickname: str, domain: str) -> bool:
    """Are there calendar events today?
    """
    now = datetime.now()
    year = now.year
    monthNumber = now.month
    dayNumber = now.day

    calendarFilename = \
        baseDir + '/accounts/' + nickname + '@' + domain + \
        '/calendar/' + str(year) + '/' + str(monthNumber) + '.txt'
    if not os.path.isfile(calendarFilename):
        return False

    eventsExist = False
    with open(calendarFilename, 'r') as eventsFile:
        for postId in eventsFile:
            postId = postId.replace('\n', '').replace('\r', '')
            postFilename = locatePost(baseDir, nickname, domain, postId)
            if not postFilename:
                continue

            postJsonObject = loadJson(postFilename)
            if not isHappeningPost(postJsonObject):
                continue

            for tag in postJsonObject['object']['tag']:
                if not isHappeningEvent(tag):
                    continue
                # this tag is an event or a place
                if tag['type'] != 'Event':
                    continue
                # tag is an event
                if not tag.get('startTime'):
                    continue
                eventTime = \
                    datetime.strptime(tag['startTime'],
                                      "%Y-%m-%dT%H:%M:%S%z")
                if int(eventTime.strftime("%Y")) == year and \
                   int(eventTime.strftime("%m")) == monthNumber and \
                   int(eventTime.strftime("%d")) == dayNumber:
                    eventsExist = True
                    break

    return eventsExist


def thisWeeksEventsCheck(baseDir: str, nickname: str, domain: str) -> bool:
    """Are there calendar events this week?
    """
    now = datetime.now()
    year = now.year
    monthNumber = now.month
    dayNumber = now.day

    calendarFilename = \
        baseDir + '/accounts/' + nickname + '@' + domain + \
        '/calendar/' + str(year) + '/' + str(monthNumber) + '.txt'
    if not os.path.isfile(calendarFilename):
        return False

    eventsExist = False
    with open(calendarFilename, 'r') as eventsFile:
        for postId in eventsFile:
            postId = postId.replace('\n', '').replace('\r', '')
            postFilename = locatePost(baseDir, nickname, domain, postId)
            if not postFilename:
                continue

            postJsonObject = loadJson(postFilename)
            if not isHappeningPost(postJsonObject):
                continue

            for tag in postJsonObject['object']['tag']:
                if not isHappeningEvent(tag):
                    continue
                # this tag is an event or a place
                if tag['type'] != 'Event':
                    continue
                # tag is an event
                if not tag.get('startTime'):
                    continue
                eventTime = \
                    datetime.strptime(tag['startTime'],
                                      "%Y-%m-%dT%H:%M:%S%z")
                if (int(eventTime.strftime("%Y")) == year and
                    int(eventTime.strftime("%m")) == monthNumber and
                    (int(eventTime.strftime("%d")) > dayNumber and
                     int(eventTime.strftime("%d")) <= dayNumber + 6)):
                    eventsExist = True
                    break

    return eventsExist


def getThisWeeksEvents(baseDir: str, nickname: str, domain: str) -> {}:
    """Retrieves calendar events for this week
    Returns a dictionary indexed by day number of lists containing
    Event and Place activities
    Note: currently not used but could be with a weekly calendar screen
    """
    now = datetime.now()
    year = now.year
    monthNumber = now.month
    dayNumber = now.day

    calendarFilename = \
        baseDir + '/accounts/' + nickname + '@' + domain + \
        '/calendar/' + str(year) + '/' + str(monthNumber) + '.txt'

    events = {}
    if not os.path.isfile(calendarFilename):
        return events

    calendarPostIds = []
    recreateEventsFile = False
    with open(calendarFilename, 'r') as eventsFile:
        for postId in eventsFile:
            postId = postId.replace('\n', '').replace('\r', '')
            postFilename = locatePost(baseDir, nickname, domain, postId)
            if not postFilename:
                recreateEventsFile = True
                continue

            postJsonObject = loadJson(postFilename)
            if not isHappeningPost(postJsonObject):
                continue

            postEvent = []
            dayOfMonth = None
            weekDayIndex = None
            for tag in postJsonObject['object']['tag']:
                if not isHappeningEvent(tag):
                    continue
                # this tag is an event or a place
                if tag['type'] == 'Event':
                    # tag is an event
                    if not tag.get('startTime'):
                        continue
                    eventTime = \
                        datetime.strptime(tag['startTime'],
                                          "%Y-%m-%dT%H:%M:%S%z")
                    if (int(eventTime.strftime("%Y")) == year and
                        int(eventTime.strftime("%m")) == monthNumber and
                        (int(eventTime.strftime("%d")) >= dayNumber and
                         int(eventTime.strftime("%d")) <= dayNumber + 6)):
                        dayOfMonth = str(int(eventTime.strftime("%d")))
                        weekDayIndex = dayOfMonth - dayNumber
                        postEvent.append(tag)
                else:
                    # tag is a place
                    postEvent.append(tag)
            if postEvent and weekDayIndex:
                calendarPostIds.append(postId)
                if not events.get(dayOfMonth):
                    events[weekDayIndex] = []
                events[dayOfMonth].append(postEvent)

    # if some posts have been deleted then regenerate the calendar file
    if recreateEventsFile:
        calendarFile = open(calendarFilename, "w")
        for postId in calendarPostIds:
            calendarFile.write(postId + '\n')
        calendarFile.close()

    lastDayOfMonth = daysInMonth(year, monthNumber)
    if dayNumber+6 > lastDayOfMonth:
        monthNumber += 1
        if monthNumber > 12:
            monthNumber = 1
            year += 1
        for d in range(1, dayNumber + 6 - lastDayOfMonth):
            dailyEvents = \
                getTodaysEvents(baseDir, nickname, domain,
                                year, monthNumber, d)
            if dailyEvents:
                if dailyEvents.get(d):
                    newEvents = {}
                    newEvents[d + (7 - (dayNumber + 6 - lastDayOfMonth))] = \
                        dailyEvents[d]
                    events = mergeDicts(events, newEvents)

    return events


def getCalendarEvents(baseDir: str, nickname: str, domain: str,
                      year: int, monthNumber: int) -> {}:
    """Retrieves calendar events
    Returns a dictionary indexed by day number of lists containing
    Event and Place activities
    """
    calendarFilename = \
        baseDir + '/accounts/' + nickname + '@' + domain + \
        '/calendar/' + str(year) + '/' + str(monthNumber) + '.txt'

    events = {}
    if not os.path.isfile(calendarFilename):
        return events

    calendarPostIds = []
    recreateEventsFile = False
    with open(calendarFilename, 'r') as eventsFile:
        for postId in eventsFile:
            postId = postId.replace('\n', '').replace('\r', '')
            postFilename = locatePost(baseDir, nickname, domain, postId)
            if not postFilename:
                recreateEventsFile = True
                continue

            postJsonObject = loadJson(postFilename)
            if not isHappeningPost(postJsonObject):
                continue

            postEvent = []
            dayOfMonth = None
            for tag in postJsonObject['object']['tag']:
                if not isHappeningEvent(tag):
                    continue
                # this tag is an event or a place
                if tag['type'] == 'Event':
                    # tag is an event
                    if not tag.get('startTime'):
                        continue
                    eventTime = \
                        datetime.strptime(tag['startTime'],
                                          "%Y-%m-%dT%H:%M:%S%z")
                    if int(eventTime.strftime("%Y")) == year and \
                       int(eventTime.strftime("%m")) == monthNumber:
                        dayOfMonth = str(int(eventTime.strftime("%d")))
                        postEvent.append(tag)
                else:
                    # tag is a place
                    postEvent.append(tag)

            if postEvent and dayOfMonth:
                calendarPostIds.append(postId)
                if not events.get(dayOfMonth):
                    events[dayOfMonth] = []
                events[dayOfMonth].append(postEvent)

    # if some posts have been deleted then regenerate the calendar file
    if recreateEventsFile:
        calendarFile = open(calendarFilename, "w")
        for postId in calendarPostIds:
            calendarFile.write(postId + '\n')
        calendarFile.close()

    return events


def removeCalendarEvent(baseDir: str, nickname: str, domain: str,
                        year: int, monthNumber: int, messageId: str) -> None:
    """Removes a calendar event
    """
    calendarFilename = \
        baseDir + '/accounts/' + nickname + '@' + domain + \
        '/calendar/' + str(year) + '/' + str(monthNumber) + '.txt'
    if not os.path.isfile(calendarFilename):
        return
    if '/' in messageId:
        messageId = messageId.replace('/', '#')
    if messageId not in open(calendarFilename).read():
        return
    lines = None
    with open(calendarFilename, "r") as f:
        lines = f.readlines()
    if not lines:
        return
    with open(calendarFilename, "w+") as f:
        for line in lines:
            if messageId not in line:
                f.write(line)