local mode = "spiral" -- Has to be either "spiral" or "excavate"

-- Excavate config (starts at the bottom left corner of designated area)

local depth = 100
local height = 3;
local width = 20;

-- Spiral mining config

local radius = 30

-- ===================================

-- Mapping turtle position along a new x, y, z coordinate system (turtle starts at 0, 0, 0 facing positive x)

local posX = 0
local posY = 0
local posZ = 0

local facing = 0; -- 0: positive x / 1: positive z / 2: negative x / 3: negative z

-- Ore inspection methods

function isOreUp()
    local success, block = turtle.inspectUp()

    if success then
        if string.match(block.name, "ore") or string.match(block.name, "Ore") then
            return true
        end
    end
end

function isOreDown()
    local success, block = turtle.inspectDown()

    if success then
        if string.match(block.name, "ore") or string.match(block.name, "Ore") then
            return true
        end
    end
end

function isOre()
    local success, block = turtle.inspect()

    if success then
        if string.match(block.name, "ore") or string.match(block.name, "Ore") then
            return true
        end
    end
end

-- Movement/mining methods

function forceUp()
    turtle.digUp()
    moveUp()
end

function forceForward()
    turtle.dig()
    moveForward()
end

function forceDown()
    turtle.digDown()
    moveDown()
end

function moveUp()
    turtle.up()
    posY = posY + 1
end

function moveDown()
    turtle.down()
    posY = posY - 1
end

function moveForward()
    turtle.forward()

    if facing == 0 then
        posX = posX + 1
    elseif facing == 1 then
        posZ = posZ + 1
    elseif facing == 2 then
        posX = posX - 1
    elseif facing == 3 then
        posZ = posZ - 1
    end
end

function moveBack()
    turtle.back()

    if facing == 0 then
        posX = posX - 1
    elseif facing == 1 then
        posZ = posZ - 1
    elseif facing == 2 then
        posX = posX + 1
    elseif facing == 3 then
        posZ = posZ + 1
    end
end

function turnRight()
    turtle.turnRight()

    if facing < 3 then
        facing = facing + 1
    else
        facing = 0
    end
end

function turnLeft()
    turtle.turnLeft()

    if facing > 0 then
        facing = facing - 1
    else
        facing = 3
    end
end

-- Mining methods

function mineVein()
    if isOreUp() then
        forceUp()
        mineVein()
        turtle.down()
    end

    if isOreDown() then
        forceDown()
        mineVein()
        turtle.up()
    end

    for i=0, 3 do
        if isOre() then
            forceForward()
            mineVein()
            turtle.back()
        end

        turtle.turnRight()
    end
end

function mineSpiral()

end

-- Position retrieval methods

function getDistanceToStart()
    return tostring(vector.new(posX, posY, posZ) - vector.new(0, 0, 0))
end

-- Main method

function main()
    print("==== Fredriks Miner v1.0 ====")
    print()

    if mode == "spiral" then
        mineSpiral()
    elseif mode == "excavate" then
        mineExcavate()
    else
        print("[Error] Please set mode to either 'spiral' or 'excavate'")
    end
end

print(getDistanceToStart())
moveForward()
print(getDistanceToStart())
moveForward()
print(getDistanceToStart())
turnRight()
print(getDistanceToStart())
moveForward()
print(getDistanceToStart())
moveForward()
print(getDistanceToStart())
moveForward()
print(getDistanceToStart())
moveUp()
getDistanceToStart()