#!/usr/bin/env lua

-- Everything is in minutes
local DEFAULT_SLEEP_CYCLE            = 90;
local DEFAULT_TIME_TO_FALL_ASLEEP    = 40;
local DEFAULT_TIME_TO_SLEEP_POWERNAP = 5;

local gonnaFallAsleepIn, actualSleepCycle;

-- Returns text representation of hh:mm
-- calculated from [now] seconds
-- We cant use os.date because of time zones
local function getHoursAndMinsString(mins)
   local hours = mins // 60;
   local minutes = mins % 60;
   return (hours > 9 and hours or "0" .. hours) .. "h" .. (minutes > 9 and minutes or "0" .. minutes) .. "m";
end

local args = { ... };

if (#args == 2) then
   gonnaFallAsleepIn = tonumber(args[1]);
   actualSleepCycle  = tonumber(args[2]);
elseif (#args == 1) then
   gonnaFallAsleepIn = tonumber(args[1]);
   actualSleepCycle  = DEFAULT_SLEEP_CYCLE;
else
   gonnaFallAsleepIn = DEFAULT_TIME_TO_FALL_ASLEEP;
   actualSleepCycle  = DEFAULT_SLEEP_CYCLE;
end

local now = os.time();

print("If gonna fall sleep at: " .. os.date("%H:%M", now + (gonnaFallAsleepIn * 60)));
print("Wake up | to sleep\n------------------");

now = now + (gonnaFallAsleepIn * 60); -- We need to start counting from when we fall asleep
local sleepLen = actualSleepCycle;
for i = 0, 7, 1 do
   print(os.date("%H:%M", now + (actualSleepCycle * 60)) .. "   | " .. getHoursAndMinsString(sleepLen));
   sleepLen = sleepLen + actualSleepCycle;
   now = now + (actualSleepCycle * 60);
end