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local aws = require("aws")
-- Look for a VPC with the tag myvpc=true.
-- If not found create one with cidr=10.0.0.0/16

-- create vpc
local function create_vpc(cidr, tags)
    vpc = {
        cidr = cidr,
    }
    if tags ~= nil and type(tags) == "table" then
        vpc["tags"] = tags
    end
    return aws.create("aws_vpc", vpc)
end

-- Get VPCs
local vpcs, err = aws.list("aws_vpc", {})
if err ~= nil then
    print(err)
    os.exit(1)
end

local vpc = { found = false }
if vpcs ~= nil then
    for _, _vpc in pairs(vpcs.Vpcs) do
        if _vpc.Tags ~= nil then
            for _, v in pairs(_vpc.Tags) do
                if v.Key == "myvpc" and v.Value == "true" then
                    vpc.found = true
                    vpc.id = _vpc.VpcId
                end
            end
        end
    end
end

local vpc_id
if vpc.found then
    print("myvpc VPC found. ID: " .. vpc.id)
    vpc_id = vpc.id
else
    local vpc, err = create_vpc("10.0.0.0/16", { myvpc = "true" })
    if err ~= nil then
        print("vpc creation failed: " .. err)
        os.exit(1)
    end
    if vpc ~= nil then
        print("vpc created: " .. vpc.Vpc.VpcId)
        vpc_id = vpc.Vpc.VpcId
    end
end