EclipseTracker

--[[
Purpose: To remind the player that the Astral Sorcery Horologium constellation is coming.
Uses CC:Tweaked and Plethora mods to track the in-game Eclipse
Made with the Engimatica 2:Expert modpack for Minecraft 1.12.2
Wiki says eclipse occurs every 36 days, but only after the first eclipse
I found the first eclipse in my testing world occured at 34 days
--]]

--Requires the Overlay Glasses, Clock & Daylight Sensor
--Peripherals to be installed in the Neural Connector
local interface = peripheral.wrap("back")

--Canvas to draw objects on
local canvas = interface.canvas()
canvas.clear()

--Group box and text objects together, all will be drawn on the canvas
local iGroup = canvas.addGroup({0,50})
local rect = iGroup.addRectangle(0,0,180,25, 0x00FF002F)
local text = iGroup.addText({5,5}, "")
local dbg = iGroup.addText({5,15}, "")

local day
local nextDay = 0
local eclipseFlag = 0


while true do
    day = interface.getDay()
    angle = math.floor(interface.getCelestialAngle() + 0.5)
    light = interface.getSkyLight()

    --Initialize variables for a new day
    if day ~= nextDay then
       nextDay = day
       eclipseFlag = 0
       rect.setColour(0x00FF002F)
    end


    if eclipseFlag == 0 then
        --Sets eclipseFlag based on celestial angle and sky light
        if (angle > 355 or angle < 5) then
            if light <= 8 then
                text.setText("Status: Eclipse!")
                eclipseFlag = 1
            end
        else
            text.setText("Status: ")
        end
    end

    --If it's night, Horologium should be visible
    if (eclipseFlag == 1 and angle > 95 and angle < 245) then
        text.setText("Status: Horologium is in the sky!")
        rect.setColour(0xFF0000FF)
    end

    --Data for debugging
    dbg.setText("A: "..angle.."  L: "..light.."  E: "..eclipseFlag.."  ND: "..nextDay)
    sleep(5)
end

--daysLeft = (36-day%36)
--text.setText("Day: " .. day .. " | " .. daysLeft .. " Days to " .. tracker)