[1.7.2] Making unharvestable blocks behave like bedrock

[PyroMechanical]

Hey everyone, I was wondering if anyone could potentially help me with this. I am trying to make a portion of my mod so that you can't mine anything that would be unharvestable with the tool you have not mineable at all, like bedrock. In addition, I want bedrock to be mineable by the highest tier of tool that I will be making. Any suggestions? I'm still pretty new to forge, but I have about 7-8 months experience with java.

[PyroMechanical]

so, would I have the game check what block the player is currently looking at, check the harvest level, and if the item they are holding has a lower one, set the player's breaking speed to -1?