Halibut missile

subCoordX = 8583
subCoordY = 68
subCoordZ = 8016
maxDist = 10000
remMissile = 2

function clear()
    term.clear()
    term.setCursorPos(1, 1)
    term.write("        Regulus II Missile System      ")
end

function insertCoords()
    while true do
        clear()
        print("\n\nInsert coordinates:")
        term.setCursorPos(1, 6)
        term.write("X: ")
        term.setCursorPos(1, 8)
        term.write("Z: ")
        term.setCursorPos(1, 10)
        term.write("Radius: ")
        term.setCursorPos(4, 6)
        x = read()
        term.setCursorPos(4, 8)
        z = read()
        term.setCursorPos(9, 10)
        radius = read()
        radius = math.max(1, radius)
        radius = math.min(4, radius)

        term.setCursorPos(1, 12)

        if tonumber(x) ~= nil and tonumber(z) ~= nil and tonumber(radius) ~= nil then
            print("Coordinates saved.")
            break
        end
    end

    sleep(1)
    clear()
end

function drawRosace()
    term.setCursorPos(21, 6)
    term.write("    |    ")
    term.setCursorPos(21, 7)
    term.write("    |    ")
    term.setCursorPos(21, 8)
    term.write("   /|\\   ")
    term.setCursorPos(21, 9)
    term.write("  / | \\  ")
    term.setCursorPos(21, 10)
    term.write("----O----")
    term.setCursorPos(21, 11)
    term.write("  \\ | /  ")
    term.setCursorPos(21, 12)
    term.write("   \\|/   ")
    term.setCursorPos(21, 13)
    term.write("    |    ")
    term.setCursorPos(21, 14)
    term.write("    |    ")
end

function getRemainingMissile()
    term.setCursorPos(1, 19)
    if remMissile == 2 then
        term.write("Missile: [2] [1]  ")
    elseif remMissile == 1 then
        term.write("Missile: [ ] [1]  ")
    elseif remMissile == 0 then
        term.write("Missile [ ] [ ]  ")
    end
end

function launchMissile(coordx, coordz, radius)
    p = peripheral.wrap("bottom")
    w = p.getWorld(0)
    y = 128
    id = 0
    while id == 0 do
        id = w.getBlockID(coordx, y, coordz)
        y = y-1
        if y < 10 then
            clear()
            print("\n\nMissile launch failed!!!!")
            sleep(1)
            os.reboot()
        end
    end
    clear()
    w.playSound("AdvJetpacks_startup", coordx, y, coordz, 1, 0.2)
    print("\n\nLaunched cruise missiles!")
    rs.setOutput("bottom", true)
    sleep(0.5)
    rs.setOutput("bottom", false)
    sleep(1)
    w.explode(subCoordX, subCoordY, subCoordZ, 1, false, false)
    sleep(2)

    spawnMissile(coordx, coordz, radius)
end

function spawnMissile(coordX, coordZ, size)
    p = peripheral.wrap("bottom")
    w = p.getWorld(0)
    abort = false
    xt = 0 -- current position; x
    zt = 0 -- / current position; y
    d = 0 --  current direction; 0=RIGHT, 1=DOWN, 2=LEFT, 3=UP
    s = 1 --  chain size

    k=1
    while k <= size-1 do
        k = k+1
        m = 0
        if k < size-1 then
            m = 2
        else
            m = 3
        end
        j = 0
        while j<m do
            j=j+1
            i=0
            while i<s do
                i=i+1
                --std::cout << matrix[x][y] << " ";
                --print("X: " .. coordX+xt .. " Z: " .. coordZ+zt)
                id = w.getBlockID(coordX+xt, y, coordZ+zt)
                if id == 8 or id == 9 then
                    abort = true
                    break
                end

                spawnGas(coordX+xt, coordZ+zt)

                if d == 0 then zt = zt + 2
                elseif d == 1 then xt = xt + 2
                elseif d == 2 then zt = zt - 2
                elseif d == 3 then xt = xt - 2
                end
            end
            if abort == true then
                break
            end
            d = (d+1)%4
        end
        if abort == true then
            break
        end
        s = s + 1
    end

    w.setBlock(coordX, y+1, coordZ, 76, 0)
end

function spawnGas(x, z)
    w.setBlock(x, y, z, 1, 0)
    w.setBlock(x, y+2, z, 929, 0)
    --w.setBlock(x, y+1, z, 76, 0)
end

function validateCodes()
    while true do
        error = 0
        clear()
        print("\n\nAuthentication code:")
        term.setCursorPos(1, 6)
        term.write("CDR:")
        term.setCursorPos(1, 8)
        term.write("XO:")
        term.setCursorPos(6, 6)
        code1 = read()
        term.setCursorPos(6, 8)
        code2 = read()
        term.setCursorPos(1, 10)


        if tonumber(code1) ~= nil and tonumber(code2) ~= nil then
            rest = http.get("http://172.16.20.220/luanet/servlets/ssg/halibut.php?code1="..code1.."&code2="..code2)
            reply = rest.readAll()
            rest.close()

            if reply == "OK" then
                print("Launch allowed.")
                launchMissile(x, z, radius)
                break
            else
                term.setCursorPos(1,15)
                term.write("Warning! Wrong authentication code!")
                error = error + 1
                if error > 3 then
                    os.reboot()
                end
                sleep(1)
                term.setCursorPos(1,15)
                term.write("                      ")
            end
        end
    end

    sleep(1)
    clear()
end

function shootMissile()
    if remMissile > 0 then
        validateCodes()
        --launchMissile(x, z, radius)
        remMissile = remMissile - 1
        return true
    else
        return false
    end
end

function autoAcquire()
    p = peripheral.wrap("bottom")

    while true do
        clear()
        print("\n\nAutomatic target acquisition:")
        term.setCursorPos(1, 6)
        term.write("User name: ")
        term.setCursorPos(1, 9)
        term.write("Pwr: ")

        term.setCursorPos(1, 7)
        user = read()
        term.setCursorPos(7, 9)
        radius = read()
        radius = math.max(1, radius)
        radius = math.min(8, radius)

        pl = p.getPlayerByName(user)
        term.setCursorPos(1, 12)

        if pl ~= nil and tonumber(radius) ~= nil then
            ent = pl.asEntity()
            x, ignoredY, z = ent.getPosition()
            print("Target acquired.")
            break
        end
    end

    sleep(1)
    clear()
end


x = 75
z = 900
radius = 4

clear()
while true do
    getRemainingMissile()
    drawRosace()
    term.setCursorPos(1, 3)
    term.write("         ")
    term.setCursorPos(1, 3)
    term.write("X: " .. x)
    term.setCursorPos(1, 4)
    term.write("          ")
    term.setCursorPos(1, 4)
    term.write("Z: " .. z)
    term.setCursorPos(1, 5)

    d = math.floor(math.sqrt(((x - subCoordX) ^ 2) + ((z - subCoordZ) ^ 2))) / 1000

    term.write("d: " .. d .. " km               ")
    local event, key = os.pullEvent("key")
    if key == 200 then
        z = z + 1
    elseif key == 208 then
        z = z - 1
    elseif key == 203 then
        x = x - 1
    elseif key == 205 then
        x = x + 1
    elseif key == 211 then
        if d < maxDist then
            shootMissile()
        else
            clear()
            term.setCursorPos(1, 12)
            print("The target is too far.")
            sleep(2)
            clear()
        end
    elseif key == 210 then
        insertCoords()
    elseif key == 199 then
        autoAcquire()
    end
end