inspect

local function containsString(strLong, strShort)
    return string.find(strLong, strShort) ~= nil
end

--check if string starts with 1_ and outputs rest of the string
local function startsWithAndTrim(input)
    if string.sub(input, 1, 2) == "1_" then
        return true, string.sub(input, 3)
    else
        return false, input
    end
end

-- returns true if the block in this directions is in the given array
local function Forward(arr)
    local bBlockForward, data = turtle.inspect()
    local blockname = data.name
    if bBlockForward then
        for i = 1, #arr, 1 do
            local bShort, strName =  startsWithAndTrim(arr[i])
            if bShort then
                if containsString(blockname, strName) then
                    if blockname == "minecraft:lava" then
                        local level = data.state.level
                        if not (level == 0) then
                            return false
                        end
                    end
                    return true
                end
            else
                if blockname == strName then
                    if blockname == "minecraft:lava" then
                        local level = data.state.level
                        if not (level == 0) then
                            return false
                        end
                    end
                    return true
                end
            end
        end
    end
    return false
end

local function Up(arr)
    local bBlockUp, data = turtle.inspectUp()
    local blockname = data.name
    if bBlockUp then
        for i = 1, #arr, 1 do
            local bShort, strName =  startsWithAndTrim(arr[i])
            if bShort then
                if containsString(blockname, strName) then
                    if blockname == "minecraft:lava" then
                        local level = data.state.level
                        if not (level == 0) then
                            return false
                        end
                    end
                    return true
                end
            else
                if blockname == strName then
                    if blockname == "minecraft:lava" then
                        local level = data.state.level
                        if not (level == 0) then
                            return false
                        end
                    end
                    return true
                end
            end
        end
    end
    return false
end

local function Down(arr)
    local bBlockDown, data = turtle.inspectDown()
    local blockname = data.name
    if bBlockDown then
        for i = 1, #arr, 1 do
            local bShort, strName =  startsWithAndTrim(arr[i])
            if bShort then
                if containsString(blockname, strName) then
                    if blockname == "minecraft:lava" then
                        local level = data.state.level
                        if not (level == 0) then
                            return false
                        end
                    end
                    return true
                end
            else
                if blockname == strName then
                    if blockname == "minecraft:lava" then
                        local level = data.state.level
                        if not (level == 0) then
                            return false
                        end
                    end
                    return true
                end
            end
        end
    end
    return false
end

return { Forward = Forward, Up = Up, Down = Down}