myminer_v1

-- USER INPUT
print("Enter length:")
local length = tonumber(read())
print("Enter width:")
local width = tonumber(read())
print("Enter depth:")
local depth = tonumber(read())

local fuelSlot = 16
local bucketSlot = 1  -- The slot for the bucket
local stateFile = "state.txt"  -- File to store the turtle's state

-- STATE
local x, y, z = 0, 0, 0 -- relative coordinates
local dir = 0           -- 0=N, 1=E, 2=S, 3=W
local currentDepth = 0
local isMining = true

-- === MOVEMENT HELPERS ===
function refuel()
    if turtle.getFuelLevel() < 20 then
        -- First check if we have lava in the bucket
        turtle.select(bucketSlot)
        if turtle.getItemCount(bucketSlot) > 0 then
            turtle.place()  -- Place lava and fuel from it
            if turtle.refuel(1) then
                print("Refueled using lava.")
            else
                print("Failed to refuel using lava.")
            end
        else
            turtle.select(fuelSlot)
            if not turtle.refuel(1) then
                print("Out of fuel, please add more!")
            else
                print("Refueled successfully.")
            end
        end
    end
end

function tryDig()
    while turtle.detect() do
        turtle.dig()
        sleep(0.4)
    end
end

function tryDigDown()
    while turtle.detectDown() do
        turtle.digDown()
        sleep(0.4)
    end
end

function tryDigUp()
    while turtle.detectUp() do
        turtle.digUp()
        sleep(0.4)
    end
end

function forward()
    refuel()
    tryDig()
    while not turtle.forward() do
        sleep(0.2)
    end
    if dir == 0 then z = z + 1
    elseif dir == 1 then x = x + 1
    elseif dir == 2 then z = z - 1
    elseif dir == 3 then x = x - 1 end
end

function back()
    refuel()
    while not turtle.back() do
        sleep(0.2)
    end
    if dir == 0 then z = z - 1
    elseif dir == 1 then x = x - 1
    elseif dir == 2 then z = z + 1
    elseif dir == 3 then x = x + 1 end
end

function down()
    refuel()
    tryDigDown()
    while not turtle.down() do
        sleep(0.2)
    end
    y = y - 1
end

function up()
    refuel()
    tryDigUp()
    while not turtle.up() do
        sleep(0.2)
    end
    y = y + 1
end

function turnLeft()
    turtle.turnLeft()
    dir = (dir - 1) % 4
    if dir < 0 then dir = dir + 4 end
end

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

function face(target)
    while dir ~= target do
        turnRight()
    end
end

-- === GO TO COORDINATE ===
function goTo(targetX, targetY, targetZ, targetDir)
    while y < targetY do up() end
    while y > targetY do down() end

    if x < targetX then face(1) while x < targetX do forward() end
    elseif x > targetX then face(3) while x > targetX do forward() end end

    if z < targetZ then face(0) while z < targetZ do forward() end
    elseif z > targetZ then face(2) while z > targetZ do forward() end end

    face(targetDir or 0)
end

-- === INVENTORY HANDLING ===
function isInventoryFull()
    for i = 1, 15 do
        if turtle.getItemCount(i) == 0 then return false end
    end
    return true
end

function dropItems()
    local saveX, saveY, saveZ, saveDir = x, y, z, dir
    goTo(0, 0, 0, 2)
    for i = 1, 15 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.select(1)
    goTo(saveX, saveY, saveZ, saveDir)
end

-- === MINING FUNCTION ===
function mineLayer()
    for row = 1, width do
        for col = 1, length - 1 do
            forward()
            if isInventoryFull() then dropItems() end
        end
        if row < width then
            if row % 2 == 1 then turnRight(); forward(); turnRight()
            else turnLeft(); forward(); turnLeft() end
        end
    end
    if width % 2 == 1 then face(2) for i = 1, length - 1 do forward() end end
    face(3) for i = 1, width - 1 do forward() end
    face(0)
end

-- === SAVE STATE ===
function saveState()
    local file = fs.open(stateFile, "w")
    file.writeLine(x)
    file.writeLine(y)
    file.writeLine(z)
    file.writeLine(dir)
    file.writeLine(currentDepth)
    file.writeLine(isMining and "true" or "false")
    file.close()
end

-- === LOAD STATE ===
function loadState()
    if fs.exists(stateFile) then
        local file = fs.open(stateFile, "r")
        x = tonumber(file.readLine())
        y = tonumber(file.readLine())
        z = tonumber(file.readLine())
        dir = tonumber(file.readLine())
        currentDepth = tonumber(file.readLine())
        isMining = file.readLine() == "true"
        file.close()
        print("Loaded saved state.")
    else
        print("No saved state found.")
    end
end

-- === MAIN EXECUTION ===
loadState()

print("Starting mining...")

if y == 0 then
    turtle.digDown()
    down()
end

for d = currentDepth, depth do
    mineLayer()
    if d < depth then down() end
    currentDepth = d
    saveState()  -- Save state after each layer
end

-- Final return to origin, face chest
goTo(0, 0, 0, 2)
for i = 1, 15 do
    turtle.select(i)
    turtle.drop()
end
turtle.select(1)
goTo(0, 0, 0, 0)

print("Mining complete. Ready to unload into chest.")