-- This tests the format, not the randomness

local uuid = require "util.uuid";

describe("util.uuid", function()

	describe("#generate()", function()

		it("should work follow the UUID pattern", function()

			-- https://www.rfc-editor.org/rfc/rfc4122.html#section-4.4

			local pattern = "^" .. table.concat({

				string.rep("%x", 8),

				string.rep("%x", 4),

				"4" .. -- version

				string.rep("%x", 3),

				"[89ab]" .. -- reserved bits of 1 and 0

				string.rep("%x", 3),

				string.rep("%x", 12),

			}, "%-") .. "$";

			for _ = 1, 100 do

				assert.is_string(uuid.generate():match(pattern));

			end

			assert.truthy(uuid.generate() ~= uuid.generate(), "does not generate the same UUIDv4 twice")

		end);

	end);

	describe("#v7", function()

		it("should also follow the UUID pattern", function()

			local pattern = "^" .. table.concat({

					string.rep("%x", 8),

					string.rep("%x", 4),

					"7" .. -- version

					string.rep("%x", 3),

					"[89ab]" .. -- reserved bits of 1 and 0

					string.rep("%x", 3),

					string.rep("%x", 12),

				}, "%-") .. "$";

			local one = uuid.v7(); -- one before the loop to ensure some time passes

			for _ = 1, 100 do

				assert.is_string(uuid.v7():match(pattern));

			end

			-- one after the loop when some time should have passed

			assert.truthy(one < uuid.v7(), "should be ordererd")

		end);

	end);

end);