Module:Tirerim/sandbox/RatWeekend

Documentation for this module may be created at Module:Tirerim/sandbox/RatWeekend/doc

local p = {}

local function season_offset(current_season, future_season)
  local seasons = { 
  	['Freeze-and-Fall'] = 0, 
  	['Lying-Longing'] = 1, 
  	['Candle-Canker'] = 2, 
  	['Wink-and-Wane'] = 3, 
  	['Vial-Vane'] = 4, 
  	['Take-and-Toil'] = 5, 
  	['Wine-Whisper'] = 6, 
  	['Rise-and-Rake'] = 7, 
  	['Nitre-Knife'] = 8, 
  	['Kifer-Caitiff'] = 9, 
  	['Skitter-Scatter'] = 10, 
  	['Dimmest-Dark'] = 11 
  }
  local offset = ( seasons[future_season] - seasons[current_season] ) % 12
  return offset
end

-- since we only care about whole days, we can just add/subtract days worth of seconds to/from epoch time
local function rat_start_for_time(time)
  local weekday = os.date("%w", time)
  local friday = (5 - weekday) * 86400 + time
  if (weekday == '1' and os.date("%H%M", time) < '1100') or weekday == '0' then
    friday = friday - (7 * 86400)
  end
  return friday
end

local function date_for_offset(offset)
  local current_time = os.time()
  local start_day = rat_start_for_time(current_time) + (offset * 7 * 86400)
  local end_day = start_day + (3 * 86400)
  return os.date("%b&nbsp;%d", start_day) .. '&nbsp;- ' .. os.date("%b&nbsp;%d", end_day)
end

-- given the current Rat-Season and some future Rat-Season (possibly identical),
-- calculates the dates when it will next (or currently) occur
function p.weekend(frame)
  local current_season = frame.args[1]
  local future_season = frame.args[2]
  local offset = season_offset(current_season, future_season)
  return date_for_offset(offset)
end

return p