import { beforeEach, describe, expect, it } from "bun:test";
import { createHash, randomBytes } from "node:crypto";
import { Hono } from "hono";
import { mcpRoutes } from "../../src/server/mcp/index.ts";
import { oauthRoutes, wellKnownRoute } from "../../src/server/routes/oauth.ts";
import { createUser } from "../../src/server/services/auth.service.ts";
import { createTestDb } from "../helpers/db.ts";

function createTestApp() {
	const db = createTestDb();
	const app = new Hono<{ Variables: { db?: any } }>();
	app.use("*", async (c, next) => {
		c.set("db", db);
		await next();
	});
	app.route("/.well-known", wellKnownRoute);
	app.route("/oauth", oauthRoutes);
	return { app, db };
}

function createFullTestApp() {
	const db = createTestDb();
	const app = new Hono<{ Variables: { db?: any } }>();
	app.use("*", async (c, next) => {
		c.set("db", db);
		await next();
	});
	app.route("/.well-known", wellKnownRoute);
	app.route("/oauth", oauthRoutes);
	app.route("/mcp", mcpRoutes);
	return { app, db };
}

function generatePkce() {
	const verifier = randomBytes(32).toString("hex");
	const challenge = createHash("sha256").update(verifier).digest("base64url");
	return { verifier, challenge };
}

describe("OAuth Routes", () => {
	let app: Hono;
	let db: ReturnType<typeof createTestDb>;

	beforeEach(async () => {
		const testApp = createTestApp();
		app = testApp.app;
		db = testApp.db;
		await createUser(db, "admin", "secret123");
	});

	describe("GET /.well-known/oauth-authorization-server", () => {
		it("returns 200 with correct metadata fields", async () => {
			const res = await app.request("/.well-known/oauth-authorization-server");
			expect(res.status).toBe(200);

			const body = await res.json();
			expect(body.issuer).toBeDefined();
			expect(body.authorization_endpoint).toContain("/oauth/authorize");
			expect(body.token_endpoint).toContain("/oauth/token");
			expect(body.registration_endpoint).toContain("/oauth/register");
			expect(body.response_types_supported).toEqual(["code"]);
			expect(body.grant_types_supported).toEqual([
				"authorization_code",
				"refresh_token",
			]);
			expect(body.code_challenge_methods_supported).toEqual(["S256"]);
			expect(body.token_endpoint_auth_methods_supported).toEqual(["none"]);
		});
	});

	describe("POST /oauth/register", () => {
		it("returns 201 with client_id, client_name, redirect_uris", async () => {
			const res = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					client_name: "Test Client",
					redirect_uris: ["http://localhost:3000/callback"],
				}),
			});

			expect(res.status).toBe(201);
			const body = await res.json();
			expect(body.client_id).toBeDefined();
			expect(body.client_name).toBe("Test Client");
			expect(body.redirect_uris).toEqual(["http://localhost:3000/callback"]);
		});

		it("returns 400 without redirect_uris", async () => {
			const res = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({ client_name: "Test Client" }),
			});

			expect(res.status).toBe(400);
		});
	});

	describe("GET /oauth/authorize", () => {
		it("returns 200 HTML with form when params are valid", async () => {
			// Register a client first
			const regRes = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					client_name: "Test Client",
					redirect_uris: ["http://localhost:3000/callback"],
				}),
			});
			const { client_id } = await regRes.json();
			const { challenge } = generatePkce();

			const params = new URLSearchParams({
				response_type: "code",
				client_id,
				redirect_uri: "http://localhost:3000/callback",
				code_challenge: challenge,
				code_challenge_method: "S256",
				state: "abc123",
			});

			const res = await app.request(`/oauth/authorize?${params}`);
			expect(res.status).toBe(200);

			const html = await res.text();
			expect(html).toContain("GearBox");
			expect(html).toContain("password");
			expect(html).toContain("Test Client");
		});

		it("returns 400 with invalid client_id", async () => {
			const { challenge } = generatePkce();
			const params = new URLSearchParams({
				response_type: "code",
				client_id: "nonexistent",
				redirect_uri: "http://localhost:3000/callback",
				code_challenge: challenge,
				code_challenge_method: "S256",
				state: "abc123",
			});

			const res = await app.request(`/oauth/authorize?${params}`);
			expect(res.status).toBe(400);
		});
	});

	describe("POST /oauth/authorize", () => {
		it("returns 200 HTML with error on wrong password", async () => {
			// Register a client
			const regRes = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					client_name: "Test Client",
					redirect_uris: ["http://localhost:3000/callback"],
				}),
			});
			const { client_id } = await regRes.json();
			const { challenge } = generatePkce();

			const formBody = new URLSearchParams({
				username: "admin",
				password: "wrongpassword",
				client_id,
				redirect_uri: "http://localhost:3000/callback",
				code_challenge: challenge,
				code_challenge_method: "S256",
				state: "abc123",
			});

			const res = await app.request("/oauth/authorize", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: formBody.toString(),
			});

			expect(res.status).toBe(200);
			const html = await res.text();
			expect(html).toContain("Invalid");
		});
	});

	describe("Full OAuth flow", () => {
		it("register → authorize → token exchange", async () => {
			// 1. Register client
			const regRes = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					client_name: "Test Client",
					redirect_uris: ["http://localhost:3000/callback"],
				}),
			});
			const { client_id } = await regRes.json();
			const { verifier, challenge } = generatePkce();

			// 2. POST /oauth/authorize with correct credentials
			const formBody = new URLSearchParams({
				username: "admin",
				password: "secret123",
				client_id,
				redirect_uri: "http://localhost:3000/callback",
				code_challenge: challenge,
				code_challenge_method: "S256",
				state: "mystate",
			});

			const authRes = await app.request("/oauth/authorize", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: formBody.toString(),
				redirect: "manual",
			});

			expect(authRes.status).toBe(302);
			const location = authRes.headers.get("location")!;
			expect(location).toContain("code=");
			expect(location).toContain("state=mystate");

			const redirectUrl = new URL(location);
			const code = redirectUrl.searchParams.get("code")!;

			// 3. Exchange code for tokens
			const tokenBody = new URLSearchParams({
				grant_type: "authorization_code",
				code,
				code_verifier: verifier,
				client_id,
				redirect_uri: "http://localhost:3000/callback",
			});

			const tokenRes = await app.request("/oauth/token", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: tokenBody.toString(),
			});

			expect(tokenRes.status).toBe(200);
			const tokens = await tokenRes.json();
			expect(tokens.access_token).toBeDefined();
			expect(tokens.refresh_token).toBeDefined();
			expect(tokens.token_type).toBe("Bearer");
			expect(tokens.expires_in).toBe(3600);
		});
	});

	describe("Full OAuth → MCP Flow", () => {
		it("complete flow: register → authorize → token → MCP call", async () => {
			const { app, db } = createFullTestApp();
			await createUser(db, "admin", "secret123");
			const { verifier, challenge } = generatePkce();

			// 1. Register client
			const regRes = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					client_name: "Claude",
					redirect_uris: ["http://localhost/cb"],
				}),
			});
			const { client_id } = await regRes.json();

			// 2. Authorize (simulate form POST)
			const authRes = await app.request(
				`/oauth/authorize?response_type=code&client_id=${client_id}&redirect_uri=${encodeURIComponent("http://localhost/cb")}&code_challenge=${challenge}&code_challenge_method=S256&state=test`,
				{
					method: "POST",
					headers: { "Content-Type": "application/x-www-form-urlencoded" },
					body: new URLSearchParams({
						username: "admin",
						password: "secret123",
						client_id,
						redirect_uri: "http://localhost/cb",
						code_challenge: challenge,
						code_challenge_method: "S256",
						state: "test",
					}).toString(),
				},
			);
			const code = new URL(authRes.headers.get("location")!).searchParams.get(
				"code",
			)!;

			// 3. Exchange code for tokens
			const tokenRes = await app.request("/oauth/token", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: new URLSearchParams({
					grant_type: "authorization_code",
					code,
					code_verifier: verifier,
					client_id,
					redirect_uri: "http://localhost/cb",
				}).toString(),
			});
			const { access_token } = await tokenRes.json();

			// 4. Use token to call MCP
			const mcpRes = await app.request("/mcp", {
				method: "POST",
				headers: {
					"Content-Type": "application/json",
					Accept: "application/json, text/event-stream",
					Authorization: `Bearer ${access_token}`,
				},
				body: JSON.stringify({
					jsonrpc: "2.0",
					method: "initialize",
					params: {
						protocolVersion: "2025-03-26",
						capabilities: {},
						clientInfo: { name: "test", version: "1.0" },
					},
					id: 1,
				}),
			});

			expect(mcpRes.status).toBe(200);
		});

		it("rejects MCP call without auth when user exists", async () => {
			const { app, db } = createFullTestApp();
			await createUser(db, "admin", "secret123");

			const mcpRes = await app.request("/mcp", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					jsonrpc: "2.0",
					method: "initialize",
					params: {
						protocolVersion: "2025-03-26",
						capabilities: {},
						clientInfo: { name: "test", version: "1.0" },
					},
					id: 1,
				}),
			});

			expect(mcpRes.status).toBe(401);
			expect(mcpRes.headers.get("www-authenticate")).toContain("Bearer");
		});
	});

	describe("Token refresh", () => {
		it("exchanges refresh token for new tokens", async () => {
			// Full flow to get initial tokens
			const regRes = await app.request("/oauth/register", {
				method: "POST",
				headers: { "Content-Type": "application/json" },
				body: JSON.stringify({
					client_name: "Test Client",
					redirect_uris: ["http://localhost:3000/callback"],
				}),
			});
			const { client_id } = await regRes.json();
			const { verifier, challenge } = generatePkce();

			const formBody = new URLSearchParams({
				username: "admin",
				password: "secret123",
				client_id,
				redirect_uri: "http://localhost:3000/callback",
				code_challenge: challenge,
				code_challenge_method: "S256",
				state: "s",
			});

			const authRes = await app.request("/oauth/authorize", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: formBody.toString(),
				redirect: "manual",
			});

			const location = authRes.headers.get("location")!;
			const code = new URL(location).searchParams.get("code")!;

			const tokenBody = new URLSearchParams({
				grant_type: "authorization_code",
				code,
				code_verifier: verifier,
				client_id,
				redirect_uri: "http://localhost:3000/callback",
			});

			const tokenRes = await app.request("/oauth/token", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: tokenBody.toString(),
			});
			const tokens = await tokenRes.json();

			// Now refresh
			const refreshBody = new URLSearchParams({
				grant_type: "refresh_token",
				refresh_token: tokens.refresh_token,
				client_id,
			});

			const refreshRes = await app.request("/oauth/token", {
				method: "POST",
				headers: { "Content-Type": "application/x-www-form-urlencoded" },
				body: refreshBody.toString(),
			});

			expect(refreshRes.status).toBe(200);
			const newTokens = await refreshRes.json();
			expect(newTokens.access_token).toBeDefined();
			expect(newTokens.refresh_token).toBeDefined();
			expect(newTokens.token_type).toBe("Bearer");
			expect(newTokens.expires_in).toBe(3600);
			// Should be different tokens
			expect(newTokens.access_token).not.toBe(tokens.access_token);
		});
	});
});