import { describe, expect, it, jest, beforeEach } from "@jest/globals";
import { NotificationsService } from "../../../src/service/infrastructure/notificationsService.ts";
import { createMockLogger } from "../../helpers/createMockLogger.ts";
import type { Notification, Monitor, MonitorStatusResponse } from "../../../src/types/index.ts";
import type { MonitorActionDecision } from "../../../src/service/infrastructure/SuperSimpleQueue/SuperSimpleQueueHelper.ts";

// ── Helpers ──────────────────────────────────────────────────────────────────

const createProvider = () => ({
	sendMessage: jest.fn<() => Promise<boolean>>().mockResolvedValue(true),
	sendTestAlert: jest.fn<() => Promise<boolean>>().mockResolvedValue(true),
});

const createNotificationsRepo = () => ({
	create: jest.fn(),
	findById: jest.fn(),
	findNotificationsByIds: jest.fn(),
	findByTeamId: jest.fn(),
	updateById: jest.fn(),
	deleteById: jest.fn(),
});

const createMonitorsRepo = () => ({
	removeNotificationFromMonitors: jest.fn(),
});

const createSettingsService = (clientHost = "https://app.example.com") => ({
	getSettings: jest.fn().mockReturnValue({ clientHost }),
});

const createMessageBuilder = () => ({
	buildMessage: jest.fn().mockReturnValue({ type: "monitor_down", content: { title: "Down" } }),
	extractThresholdBreaches: jest.fn(),
});

const createService = (overrides?: Record<string, unknown>) => {
	const logger = createMockLogger();
	const notificationsRepository = createNotificationsRepo();
	const monitorsRepository = createMonitorsRepo();
	const webhookProvider = createProvider();
	const emailProvider = createProvider();
	const slackProvider = createProvider();
	const discordProvider = createProvider();
	const pagerDutyProvider = createProvider();
	const matrixProvider = createProvider();
	const teamsProvider = createProvider();
	const telegramProvider = createProvider();
	const pushoverProvider = createProvider();
	const twilioProvider = createProvider();
	const settingsService = createSettingsService();
	const notificationMessageBuilder = createMessageBuilder();

	const defaults = {
		logger,
		notificationsRepository,
		monitorsRepository,
		webhookProvider,
		emailProvider,
		slackProvider,
		discordProvider,
		pagerDutyProvider,
		matrixProvider,
		teamsProvider,
		telegramProvider,
		pushoverProvider,
		twilioProvider,
		settingsService,
		notificationMessageBuilder,
		...overrides,
	};

	const service = new NotificationsService(
		defaults.notificationsRepository as any,
		defaults.monitorsRepository as any,
		defaults.webhookProvider as any,
		defaults.emailProvider as any,
		defaults.slackProvider as any,
		defaults.discordProvider as any,
		defaults.pagerDutyProvider as any,
		defaults.matrixProvider as any,
		defaults.teamsProvider as any,
		defaults.telegramProvider as any,
		defaults.pushoverProvider as any,
		defaults.twilioProvider as any,
		defaults.settingsService as any,
		defaults.logger as any,
		defaults.notificationMessageBuilder as any
	);

	return { service, ...defaults };
};

const makeNotification = (overrides?: Partial<Notification>): Notification =>
	({
		id: "notif-1",
		userId: "user-1",
		teamId: "team-1",
		type: "email",
		notificationName: "Email Alert",
		address: "test@example.com",
		createdAt: "2026-01-01T00:00:00Z",
		updatedAt: "2026-01-01T00:00:00Z",
		...overrides,
	}) as Notification;

const makeMonitor = (overrides?: Partial<Monitor>): Monitor =>
	({
		id: "mon-1",
		teamId: "team-1",
		name: "Test Monitor",
		type: "http",
		notifications: ["notif-1"],
		...overrides,
	}) as Monitor;

const makeDecision = (overrides?: Partial<MonitorActionDecision>): MonitorActionDecision => ({
	shouldCreateIncident: false,
	shouldResolveIncident: false,
	shouldSendNotification: true,
	incidentReason: null,
	notificationReason: "status_change",
	...overrides,
});

const makeStatusResponse = () => ({ monitorId: "mon-1", status: false, code: 500 }) as unknown as MonitorStatusResponse;

// ── Tests ────────────────────────────────────────────────────────────────────

describe("NotificationsService", () => {
	// ── handleNotifications ───────────────────────────────────────────────────

	describe("handleNotifications", () => {
		it("returns false when shouldSendNotification is false", async () => {
			const { service } = createService();
			const result = await service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision({ shouldSendNotification: false }));
			expect(result).toBe(false);
		});

		it("sends notifications to all configured providers and returns true", async () => {
			const { service, notificationsRepository, emailProvider } = createService();
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([makeNotification({ type: "email" })]);

			const result = await service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision());

			expect(result).toBe(true);
			expect(emailProvider.sendMessage).toHaveBeenCalledTimes(1);
		});

		it("routes to correct provider for each notification type", async () => {
			const types = ["webhook", "slack", "matrix", "pager_duty", "discord", "email", "teams", "telegram", "pushover", "twilio"] as const;
			for (const type of types) {
				const deps = createService();
				(deps.notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([makeNotification({ type })]);

				await deps.service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision());

				const providerMap: Record<string, ReturnType<typeof createProvider>> = {
					webhook: deps.webhookProvider,
					slack: deps.slackProvider,
					matrix: deps.matrixProvider,
					pager_duty: deps.pagerDutyProvider,
					discord: deps.discordProvider,
					email: deps.emailProvider,
					teams: deps.teamsProvider,
					telegram: deps.telegramProvider,
					pushover: deps.pushoverProvider,
					twilio: deps.twilioProvider,
				};
				expect(providerMap[type].sendMessage).toHaveBeenCalledTimes(1);
			}
		});

		it("returns false and logs warning for unknown notification type", async () => {
			const { service, notificationsRepository, logger } = createService();
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([makeNotification({ type: "carrier_pigeon" as any })]);

			const result = await service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision());

			expect(result).toBe(false);
			expect(logger.warn).toHaveBeenCalledWith(
				expect.objectContaining({ message: expect.stringContaining("Unknown notification type: carrier_pigeon") })
			);
		});

		it("returns false and logs warning when notificationMessage is undefined", async () => {
			const notificationMessageBuilder = createMessageBuilder();
			notificationMessageBuilder.buildMessage.mockReturnValue(undefined);
			const { service, notificationsRepository, logger } = createService({ notificationMessageBuilder });
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([makeNotification()]);

			const result = await service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision());

			expect(result).toBe(false);
			expect(logger.warn).toHaveBeenCalledWith(expect.objectContaining({ message: "Notification message not provided" }));
		});

		it("handles monitors with no notification IDs", async () => {
			const { service, notificationsRepository } = createService();
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([]);

			const result = await service.handleNotifications(makeMonitor({ notifications: undefined as any }), makeStatusResponse(), makeDecision());

			expect(result).toBe(true);
			expect(notificationsRepository.findNotificationsByIds).toHaveBeenCalledWith([]);
		});

		it("returns false and logs when some notifications fail", async () => {
			const { service, notificationsRepository, emailProvider, slackProvider, logger } = createService();
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([
				makeNotification({ id: "n1", type: "email" }),
				makeNotification({ id: "n2", type: "slack" }),
			]);
			emailProvider.sendMessage.mockResolvedValue(true);
			slackProvider.sendMessage.mockResolvedValue(false);

			const result = await service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision());

			expect(result).toBe(false);
			expect(logger.warn).toHaveBeenCalledWith(expect.objectContaining({ message: expect.stringContaining("1 success, 1 failure") }));
		});

		it("uses fallback clientHost when settings.clientHost is empty", async () => {
			const settingsService = createSettingsService("");
			const { service, notificationsRepository, notificationMessageBuilder } = createService({ settingsService });
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([makeNotification()]);

			await service.handleNotifications(makeMonitor(), makeStatusResponse(), makeDecision());

			expect(notificationMessageBuilder.buildMessage).toHaveBeenCalledWith(
				expect.anything(),
				expect.anything(),
				expect.anything(),
				"Host not defined"
			);
		});
	});

	// ── sendTestNotification ─────────────────────────────────────────────────

	describe("sendTestNotification", () => {
		it.each([["email"], ["slack"], ["discord"], ["pager_duty"], ["matrix"], ["webhook"], ["teams"], ["telegram"], ["pushover"], ["twilio"]] as const)(
			"routes %s to the correct provider",
			async (type) => {
				const deps = createService();
				const notification = makeNotification({ type: type as any });

				const result = await deps.service.sendTestNotification(notification);

				expect(result).toBe(true);
				const providerMap: Record<string, ReturnType<typeof createProvider>> = {
					webhook: deps.webhookProvider,
					slack: deps.slackProvider,
					matrix: deps.matrixProvider,
					pager_duty: deps.pagerDutyProvider,
					discord: deps.discordProvider,
					email: deps.emailProvider,
					teams: deps.teamsProvider,
					telegram: deps.telegramProvider,
					pushover: deps.pushoverProvider,
					twilio: deps.twilioProvider,
				};
				expect(providerMap[type].sendTestAlert).toHaveBeenCalledWith(notification);
			}
		);

		it("returns false for unknown notification type", async () => {
			const { service } = createService();
			const result = await service.sendTestNotification(makeNotification({ type: "unknown" as any }));
			expect(result).toBe(false);
		});
	});

	// ── testAllNotifications ─────────────────────────────────────────────────

	describe("testAllNotifications", () => {
		it("returns true when all test alerts succeed", async () => {
			const { service, notificationsRepository } = createService();
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([
				makeNotification({ type: "email" }),
				makeNotification({ type: "slack" }),
			]);

			const result = await service.testAllNotifications(["notif-1", "notif-2"]);
			expect(result).toBe(true);
		});

		it("returns false when any test alert fails", async () => {
			const { service, notificationsRepository, emailProvider } = createService();
			emailProvider.sendTestAlert.mockResolvedValue(false);
			(notificationsRepository.findNotificationsByIds as jest.Mock).mockResolvedValue([makeNotification({ type: "email" })]);

			const result = await service.testAllNotifications(["notif-1"]);
			expect(result).toBe(false);
		});
	});

	// ── CRUD operations ──────────────────────────────────────────────────────

	describe("createNotification", () => {
		it("sets userId and teamId and delegates to repository", async () => {
			const created = makeNotification();
			const { service, notificationsRepository } = createService();
			(notificationsRepository.create as jest.Mock).mockResolvedValue(created);

			const result = await service.createNotification({ type: "email", address: "a@b.com" }, "user-1", "team-1");

			expect(result).toBe(created);
			expect(notificationsRepository.create).toHaveBeenCalledWith(expect.objectContaining({ userId: "user-1", teamId: "team-1", type: "email" }));
		});
	});

	describe("findById", () => {
		it("delegates to repository", async () => {
			const notification = makeNotification();
			const { service, notificationsRepository } = createService();
			(notificationsRepository.findById as jest.Mock).mockResolvedValue(notification);

			const result = await service.findById("notif-1", "team-1");
			expect(result).toBe(notification);
		});
	});

	describe("findNotificationsByTeamId", () => {
		it("delegates to repository", async () => {
			const notifications = [makeNotification()];
			const { service, notificationsRepository } = createService();
			(notificationsRepository.findByTeamId as jest.Mock).mockResolvedValue(notifications);

			const result = await service.findNotificationsByTeamId("team-1");
			expect(result).toBe(notifications);
		});
	});

	describe("updateById", () => {
		it("delegates to repository", async () => {
			const updated = makeNotification({ address: "new@example.com" });
			const { service, notificationsRepository } = createService();
			(notificationsRepository.updateById as jest.Mock).mockResolvedValue(updated);

			const result = await service.updateById("notif-1", "team-1", { address: "new@example.com" });
			expect(result).toBe(updated);
		});
	});

	describe("deleteById", () => {
		it("deletes notification and removes from monitors", async () => {
			const deleted = makeNotification();
			const { service, notificationsRepository, monitorsRepository } = createService();
			(notificationsRepository.deleteById as jest.Mock).mockResolvedValue(deleted);

			const result = await service.deleteById("notif-1", "team-1");

			expect(result).toBe(deleted);
			expect(monitorsRepository.removeNotificationFromMonitors).toHaveBeenCalledWith("notif-1");
		});
	});
});