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 ()
		randomize(false); -- These tests are ordered

		-- Roughly a port of scansion/scripts/pubsub_createdelete.scs
		local service = pubsub.new();

		describe("#create", function ()
			randomize(false); -- These tests are ordered
			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 ()
			randomize(false); -- These tests are ordered
			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 ()
		randomize(false); -- These tests are ordered

		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("publish with config", function ()
		randomize(false); -- These tests are ordered

		local broadcaster = spy.new(function (notif_type, node_name, subscribers, item) -- luacheck: ignore 212
		end);
		local service = pubsub.new({
			broadcaster = broadcaster;
			autocreate_on_publish = true;
		});

		it("automatically creates node with requested config", function ()
			assert(service:publish("node", true, "1", "item 1", { myoption = true }));

			local ok, config = assert(service:get_node_config("node", true));
			assert.truthy(ok);
			assert.equals(true, config.myoption);
		end);

		it("fails to publish to a node with differing config", function ()
			local ok, err = service:publish("node", true, "1", "item 2", { myoption = false });
			assert.falsy(ok);
			assert.equals("precondition-not-met", err);
		end);

		it("allows to publish to a node with differing config when only defaults are suggested", function ()
			assert(service:publish("node", true, "1", "item 2", { _defaults_only = true, myoption = false }));
		end);
	end);

	describe("#issue1082", function ()
		randomize(false); -- These tests are ordered

		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);

		it("has a default max_items", function ()
			assert.truthy(service.config.max_items);
		end)

		it("changes max_items to max", function ()
			assert.truthy(service:set_node_config("node", true, { max_items = "max" }));
		end);

		it("publishes some more items", function()
			for i = 4, service.config.max_items + 5 do
				assert.truthy(service:publish("node", true, tostring(i), "item " .. tostring(i)));
			end
		end);

		it("should still return only two items", function ()
			local ok, ret = service:get_items("node", true);
			assert.truthy(ok);
			assert.same(service.config.max_items, #ret);
		end);

	end);

	describe("the thing", function ()
		randomize(false); -- These tests are ordered

		local service = pubsub.new();

		it("creates a node with some items", function ()
			assert.truthy(service:create("node", true, { max_items = 3 }));
			assert.truthy(service:publish("node", true, "1", "item 1"));
			assert.truthy(service:publish("node", true, "2", "item 2"));
			assert.truthy(service:publish("node", true, "3", "item 3"));
		end);

		it("should return the requested item", function ()
			local ok, ret = service:get_items("node", true, "1");
			assert.truthy(ok);
			assert.same({ "1", ["1"] = "item 1" }, ret);
		end);

		it("should return multiple requested items", function ()
			local ok, ret = service:get_items("node", true, { "1", "2" });
			assert.truthy(ok);
			assert.same({
				"1",
				"2",
				["1"] = "item 1",
				["2"] = "item 2",
			}, 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.truthy(ok);
				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.truthy(ok);
				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.truthy(ok);
				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"));
				-- luacheck: ignore 211/err
				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"));
				local ok = service:publish("test", "stranger", "item1", "foo");
				assert.is_true(ok);
			end);
			it("should allow publishers to publish without a subscription", function ()
				assert(service:set_affiliation("test", true, "mypublisher", "publisher"));
				-- luacheck: ignore 211/err
				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);
				assert.is_nil(next(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);

	describe("restoring data from nodestore", function ()
		local nodestore = {
			data = {
				test = {
					name = "test";
					config = {};
					affiliations = {};
					subscribers = {
						["someone"] = true;
					};
				}
			}
		};
		function nodestore:users()
			return pairs(self.data)
		end
		function nodestore:get(key)
			return self.data[key];
		end
		local service = pubsub.new({
			nodestore = nodestore;
		});
		it("subscriptions", function ()
			local ok, ret = service:get_subscriptions(nil, true, nil)
			assert.is_true(ok);
			assert.same({ { node = "test", jid = "someone", subscription = true, } }, ret);
		end);
	end);

	describe("node config checking", function ()
		local service;
		before_each(function ()
			service = pubsub.new({
				check_node_config = function (node, actor, config) -- luacheck: ignore 212
					return config["max_items"] <= 20;
				end;
			});
		end);

		it("defaults, then configure", function ()
			local ok, err = service:create("node", true);
			assert.is_true(ok, err);

			local ok, err = service:set_node_config("node", true, { max_items = 10 });
			assert.is_true(ok, err);

			local ok, err = service:set_node_config("node", true, { max_items = 100 });
			assert.falsy(ok, err);
			assert.equals(err, "not-acceptable");
		end);

		it("create with ok config, then configure", function ()
			local ok, err = service:create("node", true, { max_items = 10 });
			assert.is_true(ok, err);

			local ok, err = service:set_node_config("node", true, { max_items = 100 });
			assert.falsy(ok, err);

			local ok, err = service:set_node_config("node", true, { max_items = 10 });
			assert.is_true(ok, err);
		end);

		it("create with unacceptable config", function ()
			local ok, err = service:create("node", true, { max_items = 100 });
			assert.falsy(ok, err);
		end);


	end);

	describe("subscriber filter", function ()
		it("works", function ()
			local filter = spy.new(function (subs) -- luacheck: ignore 212/subs
				return {["modified"] = true};
			end);
			local broadcaster = spy.new(function (notif_type, node_name, subscribers, item) -- luacheck: ignore 212
			end);
			local service = pubsub.new({
					subscriber_filter = filter;
					broadcaster = broadcaster;
				});

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

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

			local ok = service:publish("node", true, "1", "item");
			assert.truthy(ok);
			-- TODO how to match table arguments?
			assert.spy(filter).was_called();
			assert.spy(broadcaster).was_called();
		end);
	end);

	describe("persist_items", function()
		it("can be disabled", function()
			local broadcaster = spy.new(function(notif_type, node_name, subscribers, item) -- luacheck: ignore 212
			end);
			local service = pubsub.new { node_defaults = { persist_items = false }, broadcaster = broadcaster }

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

			local ok = service:publish("node", true, "1", "item");
			assert.truthy(ok);
			assert.spy(broadcaster).was_called();

			local ok, items = service:get_items("node", true);
			assert.not_truthy(ok);
			assert.equal(items, "persistent-items-unsupported");
		end);

	end)

	describe("max_items", function ()
		it("works", function ()
			local service = pubsub.new { };

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

			for i = 1, 20 do
				assert.truthy(service:publish("node", true, "item"..tostring(i), "data"..tostring(i)));
			end

			do
				local ok, items = service:get_items("node", true, nil, { max = 3 });
				assert.truthy(ok, items);
				assert.equal(3, #items);
				assert.same({
						"item20",
						"item19",
						"item18",
						item20 = "data20",
						item19 = "data19",
						item18 = "data18",
					}, items, "items should be ordered by oldest first");
			end

			do
				local ok, items = service:get_items("node", true, nil, { max = 10 });
				assert.truthy(ok, items);
				assert.equal(10, #items);
				assert.same({
						"item20",
						"item19",
						"item18",
						"item17",
						"item16",
						"item15",
						"item14",
						"item13",
						"item12",
						"item11",
						item20 = "data20",
						item19 = "data19",
						item18 = "data18",
						item17 = "data17",
						item16 = "data16",
						item15 = "data15",
						item14 = "data14",
						item13 = "data13",
						item12 = "data12",
						item11 = "data11",
					}, items, "items should be ordered by oldest first");
			end

		end);

	end)
end);