local pubsub;

setup(function ()

	pubsub = require "util.pubsub";

end);

--[[TODO:

 Retract

 Purge

 auto-create/auto-subscribe

 Item store/node store

 resize on max_items change

 service creation config provides alternative node_defaults

 get subscriptions

]]

describe("util.pubsub", function ()

	describe("simple node creation and deletion", function ()

		-- Roughly a port of scansion/scripts/pubsub_createdelete.scs

		local service = pubsub.new();

		describe("#create", function ()

			it("creates a new node", function ()

				assert.truthy(service:create("princely_musings", true));

			end);

			it("fails to create the same node again", function ()

				assert.falsy(service:create("princely_musings", true));

			end);

		end);

		describe("#delete", function ()

			it("deletes the node", function ()

				assert.truthy(service:delete("princely_musings", true));

			end);

			it("can't delete an already deleted node", function ()

				assert.falsy(service:delete("princely_musings", true));

			end);

		end);

	end);

	describe("simple publishing", function ()

		local notified;

		local broadcaster = spy.new(function (notif_type, node_name, subscribers, item) -- luacheck: ignore 212

			notified = subscribers;

		end);

		local service = pubsub.new({

			broadcaster = broadcaster;

		});

		it("creates a node", function ()

			assert.truthy(service:create("node", true));

		end);

		it("lets someone subscribe", function ()

			assert.truthy(service:add_subscription("node", true, "someone"));

		end);

		it("publishes an item", function ()

			assert.truthy(service:publish("node", true, "1", "item 1"));

			assert.truthy(notified["someone"]);

		end);

		it("called the broadcaster", function ()

			assert.spy(broadcaster).was_called();

		end);

		it("should return one item", function ()

			local ok, ret = service:get_items("node", true);

			assert.truthy(ok);

			assert.same({ "1", ["1"] = "item 1" }, ret);

		end);

		it("lets someone unsubscribe", function ()

			assert.truthy(service:remove_subscription("node", true, "someone"));

		end);

		it("does not send notifications after subscription is removed", function ()

			assert.truthy(service:publish("node", true, "1", "item 1"));

			assert.is_nil(notified["someone"]);

		end);

	end);

	describe("#issue1082", function ()

		local service = pubsub.new();

		it("creates a node with max_items = 1", function ()

			assert.truthy(service:create("node", true, { max_items = 1 }));

		end);

		it("changes max_items to 2", function ()

			assert.truthy(service:set_node_config("node", true, { max_items = 2 }));

		end);

		it("publishes one item", function ()

			assert.truthy(service:publish("node", true, "1", "item 1"));

		end);

		it("should return one item", function ()

			local ok, ret = service:get_items("node", true);

			assert.truthy(ok);

			assert.same({ "1", ["1"] = "item 1" }, ret);

		end);

		it("publishes another item", function ()

			assert.truthy(service:publish("node", true, "2", "item 2"));

		end);

		it("should return two items", function ()

			local ok, ret = service:get_items("node", true);

			assert.truthy(ok);

			assert.same({

				"2",

				"1",

				["1"] = "item 1",

				["2"] = "item 2",

			}, ret);

		end);

		it("publishes yet another item", function ()

			assert.truthy(service:publish("node", true, "3", "item 3"));

		end);

		it("should still return only two items", function ()

			local ok, ret = service:get_items("node", true);

			assert.truthy(ok);

			assert.same({

				"3",

				"2",

				["2"] = "item 2",

				["3"] = "item 3",

			}, ret);

		end);

	end);

	describe("node config", function ()

		local service;

		before_each(function ()

			service = pubsub.new();

			service:create("test", true);

		end);

		it("access is forbidden for unaffiliated entities", function ()

			local ok, err = service:get_node_config("test", "stranger");

			assert.is_falsy(ok);

			assert.equals("forbidden", err);

		end);

		it("returns an error for nodes that do not exist", function ()

			local ok, err = service:get_node_config("nonexistent", true);

			assert.is_falsy(ok);

			assert.equals("item-not-found", err);

		end);

	end);

	describe("access model", function ()

		describe("open", function ()

			local service;

			before_each(function ()

				service = pubsub.new();

				-- Do not supply any config, 'open' should be default

				service:create("test", true);

			end);

			it("should be the default", function ()

				local ok, config = service:get_node_config("test", true);

				assert.equal("open", config.access_model);

			end);

			it("should allow anyone to subscribe", function ()

				local ok = service:add_subscription("test", "stranger", "stranger");

				assert.is_true(ok);

			end);

			it("should still reject outcast-affiliated entities", function ()

				assert(service:set_affiliation("test", true, "enemy", "outcast"));

				local ok, err = service:add_subscription("test", "enemy", "enemy");

				assert.is_falsy(ok);

				assert.equal("forbidden", err);

			end);

		end);

		describe("whitelist", function ()

			local service;

			before_each(function ()

				service = assert(pubsub.new());

				assert.is_true(service:create("test", true, { access_model = "whitelist" }));

			end);

			it("should be present in the configuration", function ()

				local ok, config = service:get_node_config("test", true);

				assert.equal("whitelist", config.access_model);

			end);

			it("should not allow anyone to subscribe", function ()

				local ok, err = service:add_subscription("test", "stranger", "stranger");

				assert.is_false(ok);

				assert.equals("forbidden", err);

			end);

		end);

		describe("change", function ()

			local service;

			before_each(function ()

				service = pubsub.new();

				service:create("test", true, { access_model = "open" });

			end);

			it("affects existing subscriptions", function ()

				do

					local ok = service:add_subscription("test", "stranger", "stranger");

					assert.is_true(ok);

				end

				do

					local ok, sub = service:get_subscription("test", "stranger", "stranger");

					assert.is_true(ok);

					assert.is_true(sub);

				end

				assert(service:set_node_config("test", true, { access_model = "whitelist" }));

				do

					local ok, sub = service:get_subscription("test", "stranger", "stranger");

					assert.is_true(ok);

					assert.is_nil(sub);

				end

			end);

		end);

	end);

	describe("publish model", function ()

		describe("publishers", function ()

			local service;

			before_each(function ()

				service = pubsub.new();

				-- Do not supply any config, 'publishers' should be default

				service:create("test", true);

			end);

			it("should be the default", function ()

				local ok, config = service:get_node_config("test", true);

				assert.equal("publishers", config.publish_model);

			end);

			it("should not allow anyone to publish", function ()

				assert.is_true(service:add_subscription("test", "stranger", "stranger"));

				local ok, err = service:publish("test", "stranger", "item1", "foo");

				assert.is_falsy(ok);

				assert.equals("forbidden", err);

			end);

			it("should allow publishers to publish", function ()

				assert(service:set_affiliation("test", true, "mypublisher", "publisher"));

				local ok, err = service:publish("test", "mypublisher", "item1", "foo");

				assert.is_true(ok);

			end);

			it("should allow owners to publish", function ()

				assert(service:set_affiliation("test", true, "myowner", "owner"));

				local ok = service:publish("test", "myowner", "item1", "foo");

				assert.is_true(ok);

			end);

		end);

		describe("open", function ()

			local service;

			before_each(function ()

				service = pubsub.new();

				service:create("test", true, { publish_model = "open" });

			end);

			it("should allow anyone to publish", function ()

				local ok = service:publish("test", "stranger", "item1", "foo");

				assert.is_true(ok);

			end);

		end);

		describe("subscribers", function ()

			local service;

			before_each(function ()

				service = pubsub.new();

				service:create("test", true, { publish_model = "subscribers" });

			end);

			it("should not allow non-subscribers to publish", function ()

				local ok, err = service:publish("test", "stranger", "item1", "foo");

				assert.is_falsy(ok);

				assert.equals("forbidden", err);

			end);

			it("should allow subscribers to publish without an affiliation", function ()

				assert.is_true(service:add_subscription("test", "stranger", "stranger"));

				assert.is_true(ok);

			end);

			it("should allow publishers to publish without a subscription", function ()

				assert(service:set_affiliation("test", true, "mypublisher", "publisher"));

				local ok, err = service:publish("test", "mypublisher", "item1", "foo");

				assert.is_true(ok);

			end);

			it("should allow owners to publish without a subscription", function ()

				assert(service:set_affiliation("test", true, "myowner", "owner"));

				local ok = service:publish("test", "myowner", "item1", "foo");

				assert.is_true(ok);

			end);

		end);

	end);

	describe("item API", function ()

		local service;

		before_each(function ()

			service = pubsub.new();

			service:create("test", true, { publish_model = "subscribers" });

		end);

		describe("get_last_item()", function ()

			it("succeeds with nil on empty nodes", function ()

				local ok, id, item = service:get_last_item("test", true);

				assert.is_true(ok);

				assert.is_nil(id);

				assert.is_nil(item);

			end);

			it("succeeds and returns the last item", function ()

				service:publish("test", true, "one", "hello world");

				service:publish("test", true, "two", "hello again");

				service:publish("test", true, "three", "hey");

				service:publish("test", true, "one", "bye");

				local ok, id, item = service:get_last_item("test", true);

				assert.is_true(ok);

				assert.equal("one", id);

				assert.equal("bye", item);

			end);

		end);

		describe("get_items()", function ()

			it("fails on non-existent nodes", function ()

				local ok, err = service:get_items("no-node", true);

				assert.is_falsy(ok);

				assert.equal("item-not-found", err);

			end);

			it("returns no items on an empty node", function ()

				local ok, items = service:get_items("test", true);

				assert.is_true(ok);

				assert.equal(0, #items);

			end);

			it("returns no items on an empty node", function ()

				local ok, items = service:get_items("test", true);

				assert.is_true(ok);

				assert.equal(0, #items);

				assert.is_nil((next(items)));

			end);

			it("returns all published items", function ()

				service:publish("test", true, "one", "hello world");

				service:publish("test", true, "two", "hello again");

				service:publish("test", true, "three", "hey");

				service:publish("test", true, "one", "bye");

				local ok, items = service:get_items("test", true);

				assert.is_true(ok);

				assert.same({ "one", "three", "two", two = "hello again", three = "hey", one = "bye" }, items);

			end);

		end);

	end);

end);