import { eq } from "drizzle-orm";
import type { FastifyInstance } from "fastify";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { buildApp } from "../src/app";
import { hashPassword } from "../src/auth/password";
import { CSRF_COOKIE, CSRF_HEADER, SESSION_COOKIE } from "../src/auth/session";
import type { Database } from "../src/db/client";
import { users } from "../src/db/schema";
import { makeConfig, openTestDb } from "./helpers";

// Tests : pas de worker pino-pretty, error-handler en mode production.
process.env.NODE_ENV = "production";
process.env.SEICHE_LOG_LEVEL = "silent";

let db: Database;
let app: FastifyInstance;

beforeEach(async () => {
  db = await openTestDb();
  app = await buildApp({ config: makeConfig(), db });
});

afterEach(async () => {
  await app.close();
});

function asSetCookieList(raw: unknown): string[] {
  if (Array.isArray(raw)) return raw.filter((x): x is string => typeof x === "string");
  if (raw === undefined) return [];
  return [String(raw)];
}

function cookieValue(raw: unknown, name: string): string | undefined {
  for (const item of asSetCookieList(raw)) {
    const pair = item.split(";")[0] ?? "";
    if (pair.startsWith(`${name}=`)) return pair.slice(name.length + 1);
  }
  return undefined;
}

function cookieHeader(raw: unknown, name: string): string | undefined {
  return asSetCookieList(raw).find((item) => item.startsWith(`${name}=`));
}

async function seedUser(username: string, password: string): Promise<void> {
  await db.insert(users).values({ username, passwordHash: await hashPassword(password) });
}

describe("API /api (buildApp)", () => {
  it("GET /api/health → 200 ok", async () => {
    const res = await app.inject({ method: "GET", url: "/api/health" });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual({ status: "ok", uptimeSec: expect.any(Number) });
  });

  it("POST /api/auth/login : succès → 200, cookies httpOnly + csrfToken", async () => {
    await seedUser("alice", "correct-horse-battery");
    const res = await app.inject({
      method: "POST",
      url: "/api/auth/login",
      payload: { username: "alice", password: "correct-horse-battery" },
    });
    expect(res.statusCode).toBe(200);
    const body = res.json() as {
      user: { username: string };
      csrfToken: string;
      csrfHeader: string;
    };
    expect(body.user.username).toBe("alice");
    expect(body.csrfToken).toMatch(/^[a-f0-9]{64}$/);
    expect(body.csrfHeader).toBe(CSRF_HEADER);
    const raw = res.headers["set-cookie"];
    expect(cookieValue(raw, SESSION_COOKIE)).toMatch(/^[a-f0-9]{64}$/);
    expect(cookieValue(raw, CSRF_COOKIE)).toBe(body.csrfToken);
    expect(cookieHeader(raw, SESSION_COOKIE)).toContain("HttpOnly");
    expect(cookieHeader(raw, SESSION_COOKIE)).toContain("SameSite=Lax");
    expect(cookieHeader(raw, CSRF_COOKIE)).not.toContain("HttpOnly");
  });

  it("POST /api/auth/login : mauvais mdp ou user inconnu → 401 identique", async () => {
    await seedUser("alice", "correct-horse-battery");
    const wrong = await app.inject({
      method: "POST",
      url: "/api/auth/login",
      payload: { username: "alice", password: "nope" },
    });
    expect(wrong.statusCode).toBe(401);
    expect(wrong.json()).toEqual({ error: "invalid_credentials" });
    const unknown = await app.inject({
      method: "POST",
      url: "/api/auth/login",
      payload: { username: "ghost", password: "nope" },
    });
    expect(unknown.statusCode).toBe(401);
    expect(unknown.json()).toEqual({ error: "invalid_credentials" });
  });

  it("POST /api/auth/login : corps invalide → 400 invalid_body", async () => {
    const empty = await app.inject({ method: "POST", url: "/api/auth/login", payload: {} });
    expect(empty.statusCode).toBe(400);
    expect(empty.json()).toEqual({ error: "invalid_body" });
    const missing = await app.inject({
      method: "POST",
      url: "/api/auth/login",
      payload: { username: "alice" },
    });
    expect(missing.statusCode).toBe(400);
  });

  it("POST /api/auth/login : 6e tentative dans la minute → 429 (rate limit par IP)", async () => {
    await seedUser("alice", "correct-horse-battery");
    for (let i = 0; i < 5; i++) {
      const res = await app.inject({
        method: "POST",
        url: "/api/auth/login",
        payload: { username: "alice", password: "wrong" },
      });
      expect(res.statusCode).toBe(401);
    }
    const blocked = await app.inject({
      method: "POST",
      url: "/api/auth/login",
      payload: { username: "alice", password: "correct-horse-battery" },
    });
    expect(blocked.statusCode).toBe(429);
    expect((blocked.json() as { error: string }).error).toBe("too_many_attempts");
  });

  it("POST /api/auth/logout sans session → 401 not_authenticated", async () => {
    const res = await app.inject({ method: "POST", url: "/api/auth/logout" });
    expect(res.statusCode).toBe(401);
    expect(res.json()).toEqual({ error: "not_authenticated" });
  });

  it("CSRF double-submit : 403 sans/mauvais header, 200 avec le bon, session détruite", async () => {
    await seedUser("alice", "correct-horse-battery");
    const login = await app.inject({
      method: "POST",
      url: "/api/auth/login",
      payload: { username: "alice", password: "correct-horse-battery" },
    });
    expect(login.statusCode).toBe(200);
    const body = login.json() as { csrfToken: string };
    const session = cookieValue(login.headers["set-cookie"], SESSION_COOKIE);
    const csrf = cookieValue(login.headers["set-cookie"], CSRF_COOKIE);
    if (session === undefined || csrf === undefined) {
      throw new Error("cookies de session manquants");
    }
    const cookies = { [SESSION_COOKIE]: session, [CSRF_COOKIE]: csrf };

    const noHeader = await app.inject({ method: "POST", url: "/api/auth/logout", cookies });
    expect(noHeader.statusCode).toBe(403);
    expect(noHeader.json()).toEqual({ error: "csrf_invalid" });

    const wrongHeader = await app.inject({
      method: "POST",
      url: "/api/auth/logout",
      cookies,
      headers: { [CSRF_HEADER]: "0".repeat(64) },
    });
    expect(wrongHeader.statusCode).toBe(403);

    const ok = await app.inject({
      method: "POST",
      url: "/api/auth/logout",
      cookies,
      headers: { [CSRF_HEADER]: body.csrfToken },
    });
    expect(ok.statusCode).toBe(200);
    expect(ok.json()).toEqual({ ok: true });
    expect(cookieValue(ok.headers["set-cookie"], SESSION_COOKIE)).toBe("");

    const after = await app.inject({ method: "GET", url: "/api/auth/session", cookies });
    expect(after.statusCode).toBe(401);
  });

  it("error-handler : exception de route → 500 internal_error, sans fuite (prod)", async () => {
    app.post("/api/test-crash", async () => {
      throw new Error("boom interne");
    });
    const res = await app.inject({ method: "POST", url: "/api/test-crash" });
    expect(res.statusCode).toBe(500);
    const body = res.json() as { error: string; details?: string };
    expect(body.error).toBe("internal_error");
    expect(body.details).toBeUndefined();
  });

  it("DB round-trip : insert → read → update → delete", async () => {
    const hash = await hashPassword("roundtrip");
    const inserted = await db
      .insert(users)
      .values({ username: "bob", passwordHash: hash })
      .returning();
    const user = inserted[0];
    if (user === undefined) throw new Error("insertion ratée");

    const [found] = await db.select().from(users).where(eq(users.id, user.id)).limit(1);
    expect(found?.username).toBe("bob");
    expect(found?.passwordHash).toBe(hash);

    const newHash = await hashPassword("roundtrip2");
    await db.update(users).set({ passwordHash: newHash }).where(eq(users.id, user.id));
    const [updated] = await db.select().from(users).where(eq(users.id, user.id)).limit(1);
    expect(updated?.passwordHash).toBe(newHash);

    await db.delete(users).where(eq(users.id, user.id));
    const remaining = await db.select().from(users).where(eq(users.id, user.id)).limit(1);
    expect(remaining).toHaveLength(0);
  });
});