OC/SystemRequirements

local component  = require "component"
local computer   = require "computer"
local filesystem = require "filesystem"
local shell      = require "shell"

local MEMORY_TIER_LIST = {
    ["tier1"] = 196608,
    ["tier15"] = 262144,
    ["tier2"] = 393216,
    ["tier25"] = 524288,
    ["tier3"] = 786432,
    ["tier35"] = 1048576
}

local HARD_TIER_LIST = {
    ["tier1"] = 1048576,
    ["tier2"] = 2097152,
    ["tier3"] = 4194304
}

local GPU_TIER_LIST = {
    ["tier1"] = 1,
    ["tier2"] = 4,
    ["tier3"] = 8
}

local function getAllHDD()
    local args, options = shell.parse(threedot)

    local candidates = {}
    for address in component.list("filesystem", true) do
      local dev = component.proxy(address)
      if not dev.isReadOnly() and dev.address ~= computer.tmpAddress() then
        table.insert(candidates, dev)
      end
    end

    return candidates
end

--Check system requirements
local function checkMemory(require_memory)
    if ( computer.totalMemory() >= require_memory) then
        return true
    end

    return false
end

local function checkHDD(require_hdd_size)
    local hdds = getAllHDD()
    local totalHDDSize = 0
    for i = 1, #hdds do
        totalHDDSize = totalHDDSize + hdds[i].spaceTotal()
    end

    if ( totalHDDSize >= require_hdd_size ) then
        return true
    end

    return false
end

local function checkGPU(tier, count)
    local graphicCards = component.list("gpu")
    local len = 0

    --Get graphicCards len
    --#graphicCards not worked
    for i in graphicCards do
        len = len + 1
    end

    if ( len >= count ) then
        for address in graphicCards do
            if ( component.proxy(address).maxDepth() >= tier ) then
                return true
            end
        end
    end

    return false
end

local function checkSystemRequirements()
    local memory = checkMemory(MEMORY_TIER_LIST.tier25)
    local hddSize = checkHDD(HARD_TIER_LIST.tier3)
    local gpuTier = checkGPU(GPU_TIER_LIST.tier3, 1)

    print(memory, " : ", hddSize, " : ", gpuTier)

    if ( memory and hddSize and gpuTier ) then
        return true
    end

    return false
end

print( checkSystemRequirements() )