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-- This module renders the calendar seen on [[Portal:Current events]].

local p = {}

local function makeWikilink(link, display)
if display then
return string.format('[[%s|%s]]', link, display)
else
return string.format('[[%s]]', link)
end
end

function p.main()
local dateStuff = p.getDateStuff()
local dayStrings = p.makeDayStrings(dateStuff)
return p.export(dayStrings, dateStuff)
end

function p.getDateStuff()
-- Gets date data.
local dateStuff = {}
local lang = mw.language.getContentLanguage()
--Year
local year = lang:formatDate('Y')
year = tonumber(year)
dateStuff.year = year
-- Month
local month = lang:formatDate('F')
dateStuff.month = month
-- Month and year
local monthAndYear = lang:formatDate('F Y')
local firstOfMonth = lang:formatDate('01-m-Y')
dateStuff.monthAndYear = monthAndYear
-- Previous month and year
dateStuff.previousMonthAndYear = lang:formatDate('F Y', firstOfMonth .. ' -1 month')
-- Next month and year
dateStuff.nextMonthAndYear = lang:formatDate('F Y', firstOfMonth .. ' +1 month')
-- Day
local day = lang:formatDate('j')
day = tonumber(day)
dateStuff.day = day
-- Days in month
local daysInMonth = lang:formatDate('j', firstOfMonth .. ' +1 month -1 day')
daysInMonth = tonumber(daysInMonth)
dateStuff.daysInMonth = daysInMonth
-- Weekday of the first day of the month
local firstWeekday = lang:formatDate('w', firstOfMonth) -- Sunday = 0, Saturday = 6
firstWeekday = tonumber(firstWeekday)
firstWeekday = firstWeekday + 1 -- Make compatible with Lua tables. Sunday = 1, Saturday = 7.
dateStuff.firstWeekday = firstWeekday
return dateStuff
end

function p.makeDayStrings(dateStuff)
local calStrings = {}
local currentDay = dateStuff.day
local isLinkworthy = p.isLinkworthy
local currentMonth = dateStuff.month
local currentYear = dateStuff.year
local makeDayLink = p.makeDayLink
for day = 1, dateStuff.daysInMonth do
if isLinkworthy(day, currentDay) then
calStrings[#calStrings + 1] = makeDayLink(day, currentMonth, currentYear)
else
calStrings[#calStrings + 1] = tostring(day)
end
end
return calStrings
end

function p.isLinkworthy(day, currentDay)
-- Returns true if the calendar day should be linked, and false if not.
-- Days should be linked if they are the current day or if they are within the six
-- preceding days, as that is the number of items on the current events page.
if currentDay - 6 <= day and day <= currentDay then
return true
else
return false
end
end

function p.makeDayLink(day, month, year)
return string.format("'''[[#%d %s %d|&nbsp;&nbsp;%d&nbsp;&nbsp;]]'''", year, month, day, day)
end

function p.export(dayStrings, dateStuff)
-- Generates the calendar HTML.
local monthAndYear = dateStuff.monthAndYear
local root = mw.html.create('table')
root
:addClass('infobox')
:css{
display = 'table',
width = '100%',
float = 'initial',
['max-width'] = '350px',
margin = 'auto !important',
['text-align'] = 'center',
['background-color'] = '#f5faff',
border = '1px solid #cedff2'
}
-- Headings
:tag('tr')
:css('background-color', '#cedff2')
:tag('th')
:css{['text-align'] = 'center'}
:wikitext(makeWikilink('Portal:Current events/' .. dateStuff.previousMonthAndYear, '◀'))
:done()
:tag('th')
:attr('colspan', '5')
:css{['text-align'] = 'center'}
:wikitext(makeWikilink('Portal:Current events/' .. monthAndYear, monthAndYear))
:done()
:tag('th')
:css{['text-align'] = 'center'}
:wikitext(makeWikilink('Portal:Current events/' .. dateStuff.nextMonthAndYear, '▶'))

-- Day of week headings
local dayHeadingRow = root:tag('tr')
local weekdays = {'S', 'M', 'T', 'W', 'T', 'F', 'S'}
for i, weekday in ipairs(weekdays) do
dayHeadingRow:tag('th')
:css{['width'] = '14%', ['text-align'] = 'center'}
:wikitext(weekday)
end

-- Days
local colspan = dateStuff.firstWeekday - 1
local cellCount = 0 -- Tracks the number of day cells.
local firstDayRow = root:tag('tr')
if colspan > 1 then
firstDayRow:tag('td')
:attr('colspan', tostring(colspan))
elseif colspan == 1 then
firstDayRow:tag('td')
end
for i = colspan + 1, 7 do -- Finish the first row
cellCount = cellCount + 1
firstDayRow:tag('td')
:css{['text-align'] = 'center'}
:wikitext(dayStrings[cellCount])
end
while cellCount < #dayStrings do -- Second day row onwards
local otherDayRow = root:tag('tr')
for i = 1, 7 do
cellCount = cellCount + 1
local dayString = dayStrings[cellCount]
if not dayString then
dayString = " "
end
otherDayRow:tag('td')
:css{['text-align'] = 'center'}
:wikitext(dayString)
end
end

-- Footer
root:tag('tr')
:tag('td')
:attr('colspan', '7')
:css{['padding-top'] = '3px', ['padding-bottom'] = '5px', ['font-size'] = '78%', ['text-align'] = 'right'}
:wikitext('&nbsp;&nbsp; ' .. makeWikilink('Portal:Current events/' .. monthAndYear, 'More ' .. monthAndYear .. ' events... &nbsp;&nbsp;'))

return tostring(root)
end

return p
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