local msg = include("sca_msg.lua")
local isRunning = false
local summerTime = nil

local function sca_setup_timezone()
    local time = os.time()                        // Year in seconds
    local currentYear = 1970 + (math.floor(time / 31536000))
    local leapYears = 0
    local isLeapYear = tobool((currentYear % 4 == 0) and (currentYear % 100 != 0 and currentYear % 400 == 0))

    for (i = 1970, currentYear, 1) do
        if ((i % 4 == 0) and (i % 100 != 0 and i % 400 == 0)) then
            leapYears = leapYears + 1
        end
    end
                                // Year in seconds                 // Day in seconds
    local yearBeginTimestamp = (31536000 * (currentYear - 1970)) + (86400 * leapYears)
    local daysPastYearBegin = math.floor((yearBeginTimestamp - time) / 86400)

    local daysPerMonth =
    {
        [0] = 31, // January
        [2] = 31, // March
        [3] = 30, // April
        [4] = 31, // May
        [5] = 30, // June
        [6] = 31, // July
        [7] = 31, // August
        [8] = 30, // September
        [9] = 31, // October
        [10] = 30, // November
        [11] = 31 // December
    }

    local daysInTotal = 0
    for (i = 0, 11, 1) do
        daysInTotal = daysInTotal + daysPerMonth[i]
        if (daysPastYearBegin / daysInTotal > 1) then
            continue 
        else
            local currentDay = (yearBeginTimestamp + (daysInTotal * 86400)) - yearBeginTimestamp 
        end
    end
end

local function sca_msg_to_player(time)
    if (msg[time] != nil) then
        for k, v in ipairs(player.GetHumans()) do
            v:SendLua('chat.AddText(' .. msg[time] .. ')')
        end 
    end
end

local function sca_timer_loop()
    // If timezone has been setup then...
    if summerTime != nil then
        local time = os.time()

        // Germany timezone in summer is UTC+1, in winter is UTC+2
        if summerTime then
            time = time + 3600
        else
            time = time + 7200
        end

        local timeModulo = time % 60
        if timeModulo == 0 then
            if !isRunning then
                // 86400 seconds are 24 hours. We will get time between 00:00 - 23:59 (current time) in seconds from that modulo operation. 0 = 00:00, 86340 = 23:59
                sca_msg_to_player(time % 86400)
                isRunning = true
            end
        else
            if isRunning then
                isRunning = false
            end
        end 
    end
end

hook.Add("Tick", "sca_timer_loop", sca_timer_loop)
hook.Add("Initialize", "sca_setup_timezone", sca_setup_timezone)