Mining

tunnelLength = 32
gapBetweenTunnels = 2
freakOutOres = {
    "minecraft:diamond_ore",
    "immersiveengineering:ore_silver",
}
bridgeBlocks = {
    "minecraft:granite",
    "minecraft:cobblestone",
}


UP = 1
DOWN = 2

function freakOut()
    print("FREAKING THE FUCK OUT!!!!")
    read()
end

function hasItem(name)
    for i = 1, 16 do
        local block = turtle.getItemDetail(i)
        if block ~= nil then
            if block.name == name then
                return true, i, block
            end
        end
    end
    return false, nil, nil
end

function isInFront(name)
    local success, block = turtle.inspect()
    if success == true then
        if block.name == name then
            return true
        end
    end
    return false
end

function dig(dir)
    local success, block = turtle.inspect()
    if success == true then
        for _, v in pairs(freakOutOres) do
            if v == block.name then
                freakOut()
            end
        end
    end
    dir = dir or 0
    if dir == UP then
        turtle.digUp()
    elseif dir == DOWN then
        turtle.digDown()
    else
        turtle.dig()
    end

end

function tryPlaceBridgeBlock()
    for _, v in pairs(bridgeBlocks) do
        local success, index, block = hasItem(v)
        if success == true then
            turtle.select(index)
            turtle.placeDown()
            break
        end
    end
end

function tryPlaceBridgeBlockOnFloor()
    local success, block = turtle.inspectDown()
    if success == false then
        tryPlaceBridgeBlock()
    elseif success == true then
        if block.name == "minecraft:lava" or block.name == "minecraft:water" then
            tryPlaceBridgeBlock()
        end
    end
end

turtle.turnLeft()
turtle.turnLeft()
if isInFront("minecraft:chest") == false then
    error("No chest found!")
end
turtle.turnRight()
turtle.turnRight()
print("Chest found, lets get mining!")
offsetFromChest = 0
while true do
    turtle.turnLeft()

    --Forward Action Tunnel 1 1x2
    for i = 0, tunnelLength do
        dig()
        turtle.forward()
        dig(UP)
    end

    --Back to original spot
    for i = 0, tunnelLength do
        tryPlaceBridgeBlockOnFloor()
        turtle.back()
    end

    --Face the direction of action tunnel 2
    turtle.turnRight()
    turtle.turnRight()

    --Forward Action Tunnel 2 1x2
    for i = 0, tunnelLength do
        dig()
        turtle.forward()
        dig(UP)
    end

    --Back to original - 1 so that it isn't in the center
    for i = 0, tunnelLength - 1 do
        tryPlaceBridgeBlockOnFloor()
        turtle.back()
    end
    turtle.turnLeft()

    --Refuel on any coal it has
    local success, index, block = hasItem("minecraft:coal")
    if success == true then
        turtle.select(index)
        turtle.refuel(block.count)
    end

    --excavate 3 x 3 space in center
    for i = 0, gapBetweenTunnels do
        dig()
        turtle.forward()
        local success, block = turtle.inspectDown()
        dig(UP)
        turtle.up()
        dig(UP)
        turtle.turnLeft()
        dig()
        turtle.forward()
        dig(UP)
        dig(DOWN)
        dig()
        turtle.forward()
        dig(UP)
        dig(DOWN)
        turtle.back()
        turtle.back()
        turtle.turnRight()
        turtle.down()
    end
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()

    --Keeps dumping away cobblestone!
    local success, index, block = hasItem("minecraft:cobblestone")
    while success do
        turtle.select(index)
        turtle.drop()
        success, index, block = hasItem("minecraft:cobblestone")
    end

    --Facing towards chest runs forward
    offsetFromChest = offsetFromChest + gapBetweenTunnels + 1
    for i = 1, offsetFromChest do
        turtle.forward()
    end

    --Drops all items in chest
    for i = 1, 16 do
        turtle.select(i)
        turtle.drop()
    end
    turtle.turnRight()
    turtle.turnRight()
    for i = 1, offsetFromChest do
        turtle.forward()
    end
end