"""html calendar views

:organization: Logilab

:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

"""

from mx.DateTime import DateTime, RelativeDateTime, Date, Time, today, Sunday

from logilab.mtconverter import html_escape

from cubicweb.interfaces import ICalendarViews

from cubicweb.common.utils import date_range

from cubicweb.common.selectors import interface_selector

from cubicweb.common.registerers import priority_registerer

from cubicweb.common.view import EntityView

# Define some useful constants

ONE_MONTH = RelativeDateTime(months=1)

TODAY = today()

THIS_MONTH = TODAY.month

THIS_YEAR = TODAY.year

# mx.DateTime and ustrftime could be used to build WEEKDAYS

WEEKDAYS = [_("monday"), _("tuesday"), _("wednesday"), _("thursday"),

            _("friday"), _("saturday"), _("sunday")]

# used by i18n tools

MONTHNAMES = [ _('january'), _('february'), _('march'), _('april'), _('may'),

               _('june'), _('july'), _('august'), _('september'), _('october'),

               _('november'), _('december')

               ]

class _CalendarView(EntityView):

    """base calendar view containing helpful methods to build calendar views"""

    __registerer__ = priority_registerer

    __selectors__ = (interface_selector,)

    accepts_interfaces = (ICalendarViews,)

    need_navigation = False

    # Navigation building methods / views ####################################

    PREV = u'<a href="%s">&lt;&lt;</a>&nbsp;&nbsp;<a href="%s">&lt;</a>'

    NEXT = u'<a href="%s">&gt;</a>&nbsp;&nbsp;<a href="%s">&gt;&gt;</a>'

    NAV_HEADER = u"""<table class="calendarPageHeader">

<tr><td class="prev">%s</td><td class="next">%s</td></tr>

</table>

""" % (PREV, NEXT)

    def nav_header(self, date, smallshift=3, bigshift=9):

        """prints shortcut links to go to previous/next steps (month|week)"""

        prev1 = date - RelativeDateTime(months=smallshift)

        prev2 = date - RelativeDateTime(months=bigshift)

        next1 = date + RelativeDateTime(months=smallshift)

        next2 = date + RelativeDateTime(months=bigshift)

        rql, vid = self.rset.printable_rql(), self.id

        return self.NAV_HEADER % (

            html_escape(self.build_url(rql=rql, vid=vid, year=prev2.year, month=prev2.month)),

            html_escape(self.build_url(rql=rql, vid=vid, year=prev1.year, month=prev1.month)),

            html_escape(self.build_url(rql=rql, vid=vid, year=next1.year, month=next1.month)),

            html_escape(self.build_url(rql=rql, vid=vid, year=next2.year, month=next2.month)))

    # Calendar building methods ##############################################

    def build_calendars(self, schedule, begin, end):

        """build several HTML calendars at once, one for each month

        between begin and end

        """

        return [self.build_calendar(schedule, date)

                for date in date_range(begin, end, incr=ONE_MONTH)]

    def build_calendar(self, schedule, first_day):

        """method responsible for building *one* HTML calendar"""

        # FIXME  iterates between [first_day-first_day.day_of_week ;

        #                          last_day+6-last_day.day_of_week]

        umonth = self.format_date(first_day, '%B %Y') # localized month name

        rows = []

        current_row = [NO_CELL] * first_day.day_of_week

        for daynum in xrange(0, first_day.days_in_month):

            # build cell day

            day = first_day + daynum

            events = schedule.get(day)

            if events:

                events = [u'\n'.join(event) for event in events.values()]

                current_row.append(CELL % (daynum+1, '\n'.join(events)))

            else:

                current_row.append(EMPTY_CELL % (daynum+1))

            # store & reset current row on Sundays

            if day.day_of_week == Sunday:

                rows.append(u'<tr>%s%s</tr>' % (WEEKNUM_CELL % day.iso_week[1], ''.join(current_row)))

                current_row = []

        current_row.extend([NO_CELL] * (Sunday-day.day_of_week))

        rql = self.rset.printable_rql()

        if day.day_of_week != Sunday:

            rows.append(u'<tr>%s%s</tr>' % (WEEKNUM_CELL % day.iso_week[1], ''.join(current_row)))

        url = self.build_url(rql=rql, vid='calendarmonth',

                             year=first_day.year, month=first_day.month)

        monthlink = u'<a href="%s">%s</a>' % (html_escape(url), umonth)

        return CALENDAR(self.req) % (monthlink, '\n'.join(rows))

    def _mk_schedule(self, begin, end, itemvid='calendaritem'):

        """private method that gathers information from resultset

        and builds calendars according to it

        :param begin: begin of date range

        :param end: end of date rangs

        :param itemvid: which view to call to render elements in cells

        returns { day1 : { hour : [views] },

                  day2 : { hour : [views] } ... }

        """

        # put this here since all sub views are calling this method        

        self.req.add_css('cubicweb.calendar.css') 

        schedule = {}

        for row in xrange(len(self.rset.rows)):

            entity = self.entity(row)

            infos = u'<div class="event">'

            infos += self.view(itemvid, self.rset, row=row)

            infos += u'</div>'

            for date in entity.matching_dates(begin, end):

                day = Date(date.year, date.month, date.day)

                time = Time(date.hour, date.minute, date.second) 

                schedule.setdefault(day, {})

                schedule[day].setdefault(time, []).append(infos)

        return schedule

    @staticmethod

    def get_date_range(day=TODAY, shift=4):

        """returns a couple (begin, end)

        <begin> is the first day of current_month - shift

        <end> is the last day of current_month + (shift+1)

        """

        first_day_in_month = DateTime(day.year, day.month, 1)

        begin = first_day_in_month - RelativeDateTime(months=shift)

        end = (first_day_in_month + RelativeDateTime(months=shift+1)) - 1

        return begin, end

    def _build_ampm_cells(self, daynum, events):

        """create a view without any hourly details.

        :param daynum: day of the built cell

        :param events: dictionnary with all events classified by hours"""

        # split events according am/pm

        am_events = [event for e_time, e_list in events.iteritems()

                     if 0 <= e_time.hour < 12

                     for event in e_list]

        pm_events = [event for e_time, e_list in events.iteritems()

                     if 12 <= e_time.hour < 24

                     for event in e_list]

        # format each am/pm cell

        if am_events:

            am_content = AMPM_CONTENT % ("amCell", "am", '\n'.join(am_events))

        else:

            am_content = AMPM_EMPTY % ("amCell", "am")

        if pm_events:

            pm_content = AMPM_CONTENT % ("pmCell", "pm", '\n'.join(pm_events))

        else:

            pm_content = AMPM_EMPTY % ("pmCell", "pm")

        return am_content, pm_content

class YearCalendarView(_CalendarView):

    id = 'calendaryear'

    title = _('calendar (year)')

    def call(self, year=THIS_YEAR, month=THIS_MONTH):

        """this view renders a 3x3 calendars' table"""

        year = int(self.req.form.get('year', year))

        month = int(self.req.form.get('month', month))

        center_date = DateTime(year, month)

        begin, end = self.get_date_range(day=center_date)

        schedule = self._mk_schedule(begin, end)

        self.w(self.nav_header(center_date))

        calendars = tuple(self.build_calendars(schedule, begin, end))

        self.w(SMALL_CALENDARS_PAGE % calendars)

class SemesterCalendarView(_CalendarView):

    """this view renders three semesters as three rows of six columns,

    one column per month

    """

    id = 'calendarsemester'

    title = _('calendar (semester)')

    def call(self, year=THIS_YEAR, month=THIS_MONTH):

        year = int(self.req.form.get('year', year))

        month = int(self.req.form.get('month', month))

        begin = DateTime(year, month) - RelativeDateTime(months=2)

        end = DateTime(year, month) + RelativeDateTime(months=3)

        schedule = self._mk_schedule(begin, end)

        self.w(self.nav_header(DateTime(year, month), 1, 6))

        self.w(u'<table class="semesterCalendar">')

        self.build_calendars(schedule, begin, end)

        self.w(u'</table>')

        self.w(self.nav_header(DateTime(year, month), 1, 6))

    def build_calendars(self, schedule, begin, end):

        self.w(u'<tr>')

        rql = self.rset.printable_rql()

        for cur_month in date_range(begin, end, incr=ONE_MONTH):

            umonth = u'%s %s' % (self.format_date(cur_month, '%B'), cur_month.year)

            url = self.build_url(rql=rql, vid=self.id,

                                 year=cur_month.year, month=cur_month.month)

            self.w(u'<th colspan="2"><a href="%s">%s</a></th>' % (html_escape(url),

                                                                  umonth))

        self.w(u'</tr>')

        _ = self.req._

        for day_num in xrange(31):

            self.w(u'<tr>')

            for cur_month in date_range(begin, end, incr=ONE_MONTH):

                if day_num >= cur_month.days_in_month:

                    self.w(u'%s%s' % (NO_CELL, NO_CELL))

                else:

                    day = DateTime(cur_month.year, cur_month.month, day_num+1)

                    events = schedule.get(day)

                    self.w(u'<td>%s&nbsp;%s</td>\n' % (_(WEEKDAYS[day.day_of_week])[0].upper(), day_num+1))

                    self.format_day_events(day, events)

            self.w(u'</tr>')

    def format_day_events(self, day, events):

        if events:

            events = ['\n'.join(event) for event in events.values()]

            self.w(WEEK_CELL % '\n'.join(events))

        else:

            self.w(WEEK_EMPTY_CELL)

class MonthCalendarView(_CalendarView):

    """this view renders a 3x1 calendars' table"""

    id = 'calendarmonth'

    title = _('calendar (month)')

    def call(self, year=THIS_YEAR, month=THIS_MONTH):

        year = int(self.req.form.get('year', year))

        month = int(self.req.form.get('month', month))

        center_date = DateTime(year, month)

        begin, end = self.get_date_range(day=center_date, shift=1)

        schedule = self._mk_schedule(begin, end)

        calendars = self.build_calendars(schedule, begin, end)

        self.w(self.nav_header(center_date, 1, 3))

        self.w(BIG_CALENDARS_PAGE % tuple(calendars))

        self.w(self.nav_header(center_date, 1, 3))

class WeekCalendarView(_CalendarView):

    """this view renders a calendar for week events"""

    id = 'calendarweek'

    title = _('calendar (week)')

    def call(self, year=THIS_YEAR, week=TODAY.iso_week[1]):

        year = int(self.req.form.get('year', year))

        week = int(self.req.form.get('week', week))

        day0 = DateTime(year)

        first_day_of_week = (day0-day0.day_of_week) + 7*week

        begin, end = first_day_of_week-7, first_day_of_week+14

        schedule = self._mk_schedule(begin, end, itemvid='calendarlargeitem')

        self.w(self.nav_header(first_day_of_week))

        self.w(u'<table class="weekCalendar">')

        _weeks = [(first_day_of_week-7, first_day_of_week-1),

                  (first_day_of_week, first_day_of_week+6),

                  (first_day_of_week+7, first_day_of_week+13)]

        self.build_calendar(schedule, _weeks)

        self.w(u'</table>')

        self.w(self.nav_header(first_day_of_week))

    def build_calendar(self, schedule, weeks):

        rql = self.rset.printable_rql()

        _ = self.req._

        for monday, sunday in weeks:            

            umonth = self.format_date(monday, '%B %Y')

            url = self.build_url(rql=rql, vid='calendarmonth',

                                 year=monday.year, month=monday.month)

            monthlink = '<a href="%s">%s</a>' % (html_escape(url), umonth)

            self.w(u'<tr><th colspan="3">%s %s (%s)</th></tr>' \

                  % (_('week'), monday.iso_week[1], monthlink))

            for day in date_range(monday, sunday):

                self.w(u'<tr>')

                self.w(u'<td>%s</td>' % _(WEEKDAYS[day.day_of_week]))

                self.w(u'<td>%s</td>' % (day.strftime('%Y-%m-%d')))

                events = schedule.get(day)

                if events:

                    events = ['\n'.join(event) for event in events.values()]

                    self.w(WEEK_CELL % '\n'.join(events))

                else:

                    self.w(WEEK_EMPTY_CELL)

                self.w(u'</tr>')

    def nav_header(self, date, smallshift=1, bigshift=3):

        """prints shortcut links to go to previous/next steps (month|week)"""

        prev1 = date - RelativeDateTime(weeks=smallshift)

        prev2 = date - RelativeDateTime(weeks=bigshift)

        next1 = date + RelativeDateTime(weeks=smallshift)

        next2 = date + RelativeDateTime(weeks=bigshift)

        rql, vid = self.rset.printable_rql(), self.id

        return self.NAV_HEADER % (

            html_escape(self.build_url(rql=rql, vid=vid, year=prev2.year, week=prev2.iso_week[1])),

            html_escape(self.build_url(rql=rql, vid=vid, year=prev1.year, week=prev1.iso_week[1])),

            html_escape(self.build_url(rql=rql, vid=vid, year=next1.year, week=next1.iso_week[1])),

            html_escape(self.build_url(rql=rql, vid=vid, year=next2.year, week=next2.iso_week[1])))

class AMPMYearCalendarView(YearCalendarView):

    id = 'ampmcalendaryear'

    title = _('am/pm calendar (year)')

    def build_calendar(self, schedule, first_day):

        """method responsible for building *one* HTML calendar"""

        umonth = self.format_date(first_day, '%B %Y') # localized month name

        rows = [] # each row is: (am,pm), (am,pm) ... week_title

        current_row = [(NO_CELL, NO_CELL, NO_CELL)] * first_day.day_of_week

        rql = self.rset.printable_rql()

        for daynum in xrange(0, first_day.days_in_month):

            # build cells day

            day = first_day + daynum

            events = schedule.get(day)

            if events:

                current_row.append((AMPM_DAY % (daynum+1),) + self._build_ampm_cells(daynum, events))

            else:

                current_row.append((AMPM_DAY % (daynum+1),

                                    AMPM_EMPTY % ("amCell", "am"),

                                    AMPM_EMPTY % ("pmCell", "pm")))

            # store & reset current row on Sundays

            if day.day_of_week == Sunday:

                url = self.build_url(rql=rql, vid='ampmcalendarweek',

                                     year=day.year, week=day.iso_week[1])

                weeklink = '<a href="%s">%s</a>' % (html_escape(url),

                                                    day.iso_week[1])

                current_row.append(WEEKNUM_CELL % weeklink)

                rows.append(current_row)

                current_row = []

        current_row.extend([(NO_CELL, NO_CELL, NO_CELL)] * (Sunday-day.day_of_week))

        url = self.build_url(rql=rql, vid='ampmcalendarweek',

                             year=day.year, week=day.iso_week[1])

        weeklink = '<a href="%s">%s</a>' % (html_escape(url), day.iso_week[1])

        current_row.append(WEEKNUM_CELL % weeklink)

        rows.append(current_row)

        # build two rows for each week: am & pm

        formatted_rows = []

        for row in rows:

            week_title = row.pop()

            day_row = [day for day, am, pm in row]

            am_row = [am for day, am, pm in row]

            pm_row = [pm for day, am, pm in row]

            formatted_rows.append('<tr>%s%s</tr>'% (week_title, '\n'.join(day_row)))