cgpt_filledCircle

-- circlefill.lua - Turtle Circle Builder
-- Compatible with CC:Tweaked 1.115.1

-- Load config
local config = require("config")

-- Directions: north, east, south, west
local directions = {
    {x = 0, z = -1}, -- north
    {x = 1, z = 0},  -- east
    {x = 0, z = 1},  -- south
    {x = -1, z = 0}, -- west
}

local dir = 2 -- start facing east
local pos = {x = -config.radius, z = -config.radius} -- starting at bottom-left corner

local function turnLeft()
    dir = (dir - 2) % 4 + 1
    turtle.turnLeft()
end

local function turnRight()
    dir = dir % 4 + 1
    turtle.turnRight()
end

local function forward()
    while turtle.detect() do turtle.dig() end
    while not turtle.forward() do sleep(0.5) end
    pos.x = pos.x + directions[dir].x
    pos.z = pos.z + directions[dir].z
end

local function placeBlock()
    for i = config.placeSlotStart, config.placeSlotEnd do
        if turtle.getItemCount(i) > 0 then
            turtle.select(i)
            turtle.placeDown()
            return true
        end
    end
    return false
end

local function isInCircle(x, z, r)
    return (x * x + z * z) <= (r * r)
end

local function faceDirection(targetDir)
    while dir ~= targetDir do
        turnRight()
    end
end

local function countTotalBlocks()
    local count = 0
    for z = -config.radius, config.radius do
        for x = -config.radius, config.radius do
            if isInCircle(x, z, config.radius) then
                count = count + 1
            end
        end
    end
    return count
end

local function countInventoryBlocks()
    local total = 0
    for i = config.placeSlotStart, config.placeSlotEnd do
        total = total + turtle.getItemCount(i)
    end
    return total
end

local function estimateFuelNeeded()
    local blocks = countTotalBlocks()
    local moves = blocks + config.radius * 2
    return moves
end

local function tryRefuel()
    for i = 1, 16 do
        if turtle.getItemCount(i) > 0 then
            turtle.select(i)
            if turtle.refuel(0) then
                turtle.refuel()
            end
        end
    end
end

local function waitForUser()
    print("Press Enter to continue after refueling or adding blocks...")
    read()
end

local function checkResources()
    local requiredBlocks = countTotalBlocks()
    local availableBlocks = countInventoryBlocks()

    local requiredFuel = estimateFuelNeeded()
    local availableFuel = turtle.getFuelLevel()

    local ok = true

    if availableBlocks < requiredBlocks then
        print("Not enough blocks! Needed: " .. requiredBlocks .. ", Available: " .. availableBlocks)
        ok = false
    else
        print("Block check passed: " .. availableBlocks .. "/" .. requiredBlocks)
    end

    if availableFuel < requiredFuel then
        print("Attempting auto-refuel...")
        tryRefuel()
        availableFuel = turtle.getFuelLevel()
        if availableFuel < requiredFuel then
            print("Not enough fuel! Needed: " .. requiredFuel .. ", Available: " .. availableFuel)
            ok = false
        else
            print("Fuel check passed after refuel: " .. availableFuel .. "/" .. requiredFuel)
        end
    else
        print("Fuel check passed: " .. availableFuel .. "/" .. requiredFuel)
    end

    if not ok then
        waitForUser()
        return checkResources()
    end

    return ok
end

local function buildFilledCircle()
    local r = config.radius

    print("Starting filled circle build with radius " .. r)

    for zOffset = -r, r do
        if (zOffset + r) % 2 == 0 then
            faceDirection(2)
            for xOffset = -r, r do
                if isInCircle(xOffset, zOffset, r) then
                    placeBlock()
                end
                if xOffset < r then
                    forward()
                end
            end
        else
            faceDirection(4)
            for xOffset = r, -r, -1 do
                if isInCircle(xOffset, zOffset, r) then
                    placeBlock()
                end
                if xOffset > -r then
                    forward()
                end
            end
        end

        if zOffset < r then
            faceDirection(3)
            forward()
        end
    end

    print("Circle complete!")
end

if config.mode == "circlefill" then
    if checkResources() then
        buildFilledCircle()
    else
        print("Cannot start build due to missing resources.")
    end
else
    print("Unknown mode: " .. tostring(config.mode))
end