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-- things not to veinmine
local blacklist = {
    "minecraft:stone",
    "minecraft:dirt",
    "minecraft:diorite",
    "minecraft:andesite",
    "minecraft:granite",
    "minecraft:gravel",
    "quark:slate",
    "minecraft:grass",
    "chisel:limestone2"
}

-- vars to identify the current pos relative to start point
local x = 0
local y = 0
local z = 0
local rotation = 0

-- params
local x_size, y_size, depth, increment = ...
x_size, y_size, depth, increment = tonumber(x_size), tonumber(y_size) - 1, tonumber(depth), tonumber(increment)

--checking ore
local function check_ore(direction)
    if direction == "up" then 
        _, j = turtle.inspectUp()
        if not _ then return false end 
        for i,v in pairs(blacklist) do
            if j.name == v then
                return false
            end
        end
        return true
    elseif direction == "down" then 
        _, j = turtle.inspectDown()
        if not _ then return false end
        for i,v in pairs(blacklist) do
            if _ and j.name == v then
                return false
            end
        end
        return true
    elseif direction == "forward" then
        _, j = turtle.inspect()
        if not _ then return false end
        for i,v in pairs(blacklist) do
            if _ and j.name == v then
                return false
            end
        end
        return true
    end
end

--this is mostly for gravel/confirming if ore
local function better_forward()
    while not turtle.forward() do 
        turtle.dig()
        turtle.attack()
    end
    if check_ore("forward") then return "forward" end
    if check_ore("up") then return "up" end
    if check_ore("down") then return "down" end 
end


--veinmine
local function veinmine(direction)
    local rot, positions, tx,ty,tz, turns
    -- initializing vars and kickstarting based on where ore was found
    if direction == "forward" then
        while not turtle.forward() do
            turtle.dig()
            turtle.attack()
        end
        rot = 0
        tx, ty, tz = 0,0,1
        positions = {0}
        turns = {}
    elseif direction == "up" then
        while not turtle.up() do
            turtle.digUp()
            turtle.attackUp()
        end
        rot = 0
        tx, ty, tz = 0,1,0
        positions = {"down"}
        turns = {}
    elseif direction == "down" then
        while not turtle.down() do
            turtle.digDown()
            turtle.attackDown()
        end
        rot = 0
        tx, ty, tz = 0,-1,0
        positions = {"up"}
        turns = {}
    end     
    local shortcuts = 0
    local skips = 0
    local omega_skips = 0
    local mined = {}

    --checks if blocks around turtle are already cleared
    local function check_around()
        if mined[tostring(tx - 1) .. tostring(ty) .. tostring(tz)] and mined[tostring(tx + 1) .. tostring(ty) .. tostring(tz)] and mined[tostring(tx) .. tostring(ty) .. tostring(tz - 1)] and mined[tostring(tx) .. tostring(ty) .. tostring(tz + 1)] then
            return true
        end
        return false
    end

    local function check_left()
        --checking if the block to left is checked
        if rot % 4 == 0 and mined[tostring(tx-1) .. tostring(ty).. tostring(tz)] then
            return false
        elseif rot % 4 == 2 and mined[tostring(tx+1) .. tostring(ty).. tostring(tz)] then
            return false
        elseif rot % 4 == 1 and mined[tostring(tx) .. tostring(ty).. tostring(tz+1)] then
            return false
        elseif rot % 4 == 3 and mined[tostring(tx) .. tostring(ty).. tostring(tz-1)] then
            return false
        end

        --checking if the other blocks around are mined/checked
        if rot % 4 == 0 and (not mined[tostring(tx) .. tostring(ty).. tostring(tz+1)] or not mined[tostring(tx+1) .. tostring(ty).. tostring(tz)] or mined[tostring(tx) .. tostring(ty).. tostring(tz-1)]) then
            return false 
        elseif rot % 4 == 2 and (not mined[tostring(tx) .. tostring(ty).. tostring(tz - 1)] or not mined[tostring(tx - 1) .. tostring(ty).. tostring(tz)] or not mined[tostring(tx) .. tostring(ty).. tostring(tz + 1)]) then
            return false
        elseif rot % 4 == 1 and (not mined[tostring(tx+1) .. tostring(ty).. tostring(tz)] or not mined[tostring(tx) .. tostring(ty).. tostring(tz - 1)] or not mined[tostring(tx - 1) .. tostring(ty).. tostring(tz)]) then
            return false 
        elseif rot % 4 == 3 and (not mined[tostring(tx - 1) .. tostring(ty).. tostring(tz)] or not mined[tostring(tx) .. tostring(ty).. tostring(tz + 1)] or not mined[tostring(tx + 1) .. tostring(ty).. tostring(tz)]) then
            return false
        end
        return true
    end

    --the veinmine part
    while #positions ~= 0 do 
        print("Local position:", tx, ty, tz)
        print("Local rotation:", rot)
        local found_ore = false
        if not check_ore("up") then
            mined[tostring(tx) .. tostring(ty+1) .. tostring(tz)] = true
        end
        if not check_ore("down") then 
            mined[tostring(tx) .. tostring(ty - 1) .. tostring(tz)] = true
        end
        if check_ore("up") then
            table.insert(positions, "down")
            while not turtle.up() do
                turtle.digUp()
                turtle.attackUp()
            end
            found_ore = true
            ty = ty + 1
            mined[tostring(tx) .. tostring(ty) .. tostring(tz)] = true
        elseif check_ore("down") then
            table.insert(positions, "up")
            while not turtle.down() do
                turtle.digDown()
                turtle.attackDown()
            end
            found_ore = true
            ty = ty - 1
            mined[tostring(tx) .. tostring(ty) .. tostring(tz)] = true
        elseif not check_around() then 
            if check_left() then
                turtle.turnLeft()
                if check_ore("forward") then
                    table.insert(positions, 3)
                    while not turtle.forward() do
                        turtle.dig()
                        turtle.attack()
                    end
                    if rot % 4 == 1 then
                        tx = tx + 1
                    elseif rot % 4 == 2 then
                        tz = tz - 1
                    elseif rot % 4 == 3 then
                        tx = tx - 1
                    elseif rot % 4 == 0 then
                        tz = tz + 1
                    end
                    found_ore = true
                    mined[tostring(tx) .. tostring(ty) .. tostring(tz)] = true
                else
                    local qx, qy, qz = tx, ty, tz
                    if rot % 4 == 1 then
                        qx = qx + 1
                    elseif rot % 4 == 2 then
                        qz = qz - 1
                    elseif rot % 4 == 3 then
                        qx = qx - 1
                    elseif rot % 4 == 0 then
                        qz = qz + 1
                    end
                    mined[tostring(qx) .. tostring(qy) .. tostring(qz)] = true
                end
            else
                for i = 1,4 do
                    if check_ore("forward") then
                        table.insert(positions, i - 1)
                        turns[tostring(tx) .. tostring(ty) .. tostring(tz)] = i - 1
                        while not turtle.forward() do
                            turtle.dig()
                            turtle.attack()
                        end
                        if rot % 4 == 1 then
                            tx = tx + 1
                        elseif rot % 4 == 2 then
                            tz = tz - 1
                        elseif rot % 4 == 3 then
                            tx = tx - 1
                        elseif rot % 4 == 0 then
                            tz = tz + 1
                        end
                        found_ore = true
                        mined[tostring(tx) .. tostring(ty) .. tostring(tz)] = true
                        break
                    else
                        local qx, qy, qz = tx, ty, tz
                        if rot % 4 == 1 then
                            qx = qx + 1
                        elseif rot % 4 == 2 then
                            qz = qz - 1
                        elseif rot % 4 == 3 then
                            qx = qx - 1
                        elseif rot % 4 == 0 then
                            qz = qz + 1
                        end
                        mined[tostring(qx) .. tostring(qy) .. tostring(qz)] = true
                    end 
                    turtle.turnRight()
                    rot = rot + 1
                end
            end
        end
        if not found_ore then
            rot = rot - 4
        end   
        if not found_ore then
            if positions[#positions] == "up" then 
                while not turtle.up() do
                    turtle.digUp()
                    turtle.attackUp()
                end 
                ty = ty + 1
            elseif positions[#positions] == "down" then
                while not turtle.down() do 
                    turtle.digDown()
                    turtle.attackDown()
                end
                ty = ty - 1
            else
                if not turtle.back() then
                    turtle.turnRight()
                    turtle.turnRight()
                    while not turtle.forward() do
                        turtle.dig()
                        turtle.attack()
                    end
                    turtle.turnRight()
                    turtle.turnRight()
                end 
                if positions[#positions] == 3 then
                    turtle.turnRight()
                    rot = rot - 3
                else
                    for i = 1, positions[#positions] do
                        turtle.turnLeft()
                    end
                    rot = rot - positions[#positions]
                end
                if rot % 4 == 1 then
                    tx = tx - 1
                elseif rot % 4 == 2 then
                    tz = tz + 1
                elseif rot % 4 == 3 then
                    tx = tx + 1
                elseif rot % 4 == 0 then
                    tz = tz - 1
                end
                
            end
            table.remove(positions)
        end  
    end   
end


-- function that returns to start point
local function return_to_origin(up)
    --switch for when something is blocking its way
    local offset = false
    -- rotating it to face the starting wall
    if rotation ~= 2 then
        if rotation > 2 then
            repeat turtle.turnLeft() rotation = rotation - 1 until rotation == 2
        elseif rotation < 2 then
            repeat turtle.turnRight() rotation = rotation + 1 until rotation == 2
        end
    end
    -- moving it out of the way if theres a block in front of it
    if turtle.detect() and x ~= 0 then
        offset = true
        turtle.turnRight()
        better_forward()
        turtle.turnLeft()
    end
    -- returning to start
    for i = 1,y do 
        better_forward()
    end
    turtle.turnRight()
    if offset then
        for i = 1,x-1 do 
            better_forward()
        end
    else
        for i = 1,x do 
            better_forward()
        end
    end
    --rotating back to 0
    turtle.turnRight()
    -- going back to the top if desired
    if up then 
        for i = 1, z do 
            turtle.up()
        end
    end 
end

local function empty_storage(finished)
    if not finished then 
        for i = 1,16 do
            if turtle.getItemCount(i) == 0 then
                return
            end
        end
    end
    local old_rotation = rotation
    return_to_origin(true)
    turtle.turnRight()
    turtle.turnRight()
    for i = 1,16 do
        turtle.select(i)
        turtle.drop(64)
    end
    turtle.turnRight()
    turtle.turnRight()
    if not finished then 
        for i = 1, z do
            turtle.down()
        end
        for i = 1, y do
            better_forward()
        end
        turtle.turnRight()
        for i = 1, x do
            better_forward()
        end
        if old_rotation == 0 then
            turtle.turnLeft()
        elseif old_rotation == 2 then
            turtle.turnRight()
        end
    end
end


local function mine_sector()
    -- switch to alternate digging left/right
    local left = false
    for i = 1, x_size do 
        --digging forward
        for i = 1, y_size do
            local result = better_forward()
            if result then
                if result == "forward" then
                    veinmine("forward")
                elseif result == "up" then
                    veinmine("up")
                elseif result == "down" then 
                    veinmine("down")
                end
            end
            if not left then y = y + 1 
            else y = y - 1 end
            if y ~= y_size then
                empty_storage()
            end
        end
        --turning using switch
        if x ~= x_size - 1 then 
            if not left then 
                turtle.turnRight()
                local result = better_forward()
                turtle.turnRight()
                if result then
                    if result == "forward" then
                        veinmine("forward")
                    elseif result == "up" then
                        veinmine("up")
                    elseif result == "down" then 
                        veinmine("down")
                    end
                end
                left = true
                rotation = 2
                x = x + 1
            else
                turtle.turnLeft()
                local result = better_forward()
                turtle.turnLeft()
                if result then
                    if result == "forward" then
                        veinmine("forward")
                    elseif result == "up" then
                        veinmine("up")
                    elseif result == "down" then 
                        veinmine("down")
                    end
                end
                left = false
                rotation = 0
                x = x + 1
            end
        end 
    end
end


local function dig_deeper()
    return_to_origin(false)
    for i = 1, increment do
        if z == depth  then return end
        z = z + 1
        turtle.digDown()
        turtle.down()
    end
end

local function smart_fuel()
    local fuel_needed = (x_size * y_size) * math.floor(depth / increment) * 1.2
    term.clear()
    if turtle.getFuelLevel() <= fuel_needed then
        while turtle.getFuelLevel() <= fuel_needed do
            term.clear()
            term.setCursorPos(1,1)
            print("Fuel needed:", fuel_needed)
            term.setCursorPos(1,2)
            print("Current fuel:", turtle.getFuelLevel())
            turtle.refuel()
        end
    end
    term.clear()
    print("Success, running quarry.")
end


local function quarry()
    smart_fuel()
    while true do
        dig_deeper()
        x,y,rotation = 0,0,0
        if z >= depth then break end 
        mine_sector()
    end
    if depth % increment == 0 then
        mine_sector()
    end
    empty_storage(true)
end

quarry()