import { applyD1Migrations, env, SELF, type D1Migration } from "cloudflare:test";
import { beforeAll, beforeEach, describe, expect, it } from "vitest";

const DAY_MS = 24 * 60 * 60 * 1000;

type PublicStatusResponse = {
	overall: "operational" | "degraded" | "down";
	updatedAt: number;
	services: Array<{
		id: number;
		name: string;
		status: "up" | "down" | "unknown";
		lastCheckedAt: string | null;
		uptime90d: number | null;
		history: Array<{ day: number; uptimePct: number | null }>;
	}>;
};

async function resetDatabase() {
	await env.DB.batch([
		env.DB.prepare("DELETE FROM checks"),
		env.DB.prepare("DELETE FROM incidents"),
		env.DB.prepare("DELETE FROM monitor_daily_stats"),
		env.DB.prepare("DELETE FROM notification_settings"),
		env.DB.prepare("DELETE FROM monitors"),
		env.DB.prepare("DELETE FROM login_attempts"),
		env.DB.prepare("DELETE FROM sessions"),
		env.DB.prepare("DELETE FROM admin_credentials"),
	]);
}

async function insertMonitor(input: {
	name: string;
	url?: string;
	enabled?: boolean;
	lastOk?: boolean | null;
	lastStatusCode?: number | null;
	lastLatencyMs?: number | null;
	lastError?: string | null;
}) {
	const now = Date.now();
	const result = await env.DB.prepare(`
		INSERT INTO monitors (
			name, url, method, expected_status, interval_seconds, timeout_ms,
			enabled, alerts_enabled, last_ok, last_status_code, last_latency_ms,
			last_error, last_checked_at, created_at, updated_at
		) VALUES (?, ?, 'GET', 200, 300, 10000, ?, 1, ?, ?, ?, ?, ?, ?, ?)
	`)
		.bind(
			input.name,
			input.url ?? `https://${input.name.toLowerCase()}.example.com/health`,
			input.enabled === false ? 0 : 1,
			input.lastOk === null || input.lastOk === undefined ? null : input.lastOk ? 1 : 0,
			input.lastStatusCode ?? null,
			input.lastLatencyMs ?? null,
			input.lastError ?? null,
			now,
			now,
			now,
		)
		.run();
	return Number(result.meta.last_row_id);
}

function statusFetch(path = "/api/status") {
	return SELF.fetch(`https://example.com${path}`);
}

describe("public status API", () => {
	beforeAll(async () => {
		const testEnv = env as Env & { TEST_MIGRATIONS: D1Migration[] };
		await applyD1Migrations(testEnv.DB, testEnv.TEST_MIGRATIONS);
	});
	beforeEach(resetDatabase);

	it("returns public status without authentication and omits sensitive monitor fields", async () => {
		await insertMonitor({
			name: "Public API",
			lastOk: true,
			lastStatusCode: 200,
			lastLatencyMs: 42,
			lastError: "sensitive diagnostic",
		});

		const response = await statusFetch();
		const body = await response.json<PublicStatusResponse>();

		expect(response.status).toBe(200);
		expect(body.overall).toBe("operational");
		expect(body.updatedAt).toEqual(expect.any(Number));
		expect(body.services).toHaveLength(1);
		expect(body.services[0]).toMatchObject({
			name: "Public API",
			status: "up",
			uptime90d: null,
			history: [],
		});
		for (const privateField of ["url", "lastError", "lastStatusCode", "lastLatencyMs", "method", "timeoutMs"]) {
			expect(body.services[0]).not.toHaveProperty(privateField);
		}
	});

	it("excludes disabled monitors and reports degraded health for a partial outage", async () => {
		await insertMonitor({ name: "Healthy", lastOk: true });
		await insertMonitor({ name: "Unavailable", lastOk: false });
		await insertMonitor({ name: "Disabled secret", enabled: false, lastOk: false });
		await insertMonitor({ name: "New service", lastOk: null });

		const response = await statusFetch();
		const body = await response.json<PublicStatusResponse>();

		expect(response.status).toBe(200);
		expect(body.overall).toBe("degraded");
		expect(body.services.map((service) => service.name)).toEqual(["Healthy", "Unavailable", "New service"]);
		expect(body.services.map((service) => service.status)).toEqual(["up", "down", "unknown"]);
	});

	it("reports a total outage when every checked service is down", async () => {
		await insertMonitor({ name: "Website", lastOk: false });
		await insertMonitor({ name: "API", lastOk: false });
		await insertMonitor({ name: "Not checked", lastOk: null });

		const body = await (await statusFetch()).json<PublicStatusResponse>();
		expect(body.overall).toBe("down");
	});

	it("combines historical daily rollups and today's checks into 90-day uptime", async () => {
		const id = await insertMonitor({ name: "Aggregated", lastOk: true });
		const now = new Date();
		const today = Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate());
		await env.DB.batch([
			env.DB.prepare("INSERT INTO monitor_daily_stats (monitor_id, day, total_checks, up_checks, avg_latency_ms, min_latency_ms, max_latency_ms) VALUES (?, ?, 8, 6, 100, 50, 150)").bind(id, today - DAY_MS),
			env.DB.prepare("INSERT INTO checks (monitor_id, ok, status_code, latency_ms, checked_at) VALUES (?, 1, 200, 90, ?)").bind(id, today + 1_000),
			env.DB.prepare("INSERT INTO checks (monitor_id, ok, status_code, latency_ms, checked_at) VALUES (?, 1, 200, 110, ?)").bind(id, today + 2_000),
		]);

		const body = await (await statusFetch()).json<PublicStatusResponse>();
		const service = body.services[0];

		expect(service.uptime90d).toBe(80);
		expect(service.history).toEqual([
			{ day: today - DAY_MS, uptimePct: 75 },
			{ day: today, uptimePct: 100 },
		]);
	});

	it("keeps the administrative monitor collection protected", async () => {
		const response = await SELF.fetch("https://example.com/api/monitors");
		expect(response.status).toBe(401);
		expect(await response.json()).toEqual({ message: "Authentication required" });
	});

	it("does not expose a favicon for a disabled service", async () => {
		const id = await insertMonitor({ name: "Private", enabled: false });
		const response = await statusFetch(`/api/status/${id}/favicon`);
		expect(response.status).toBe(404);
		expect(await response.json()).toEqual({ message: "Service not found" });
	});
});