import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { createTestDb } from "@parking/db/testing";
import { type Db } from "@parking/db";
import type { FastifyInstance } from "fastify";
import { buildServer } from "../server.js";
import { seedUser, login } from "../test-helpers.js";

// HTTP integration for the backup routes — the security seam + the unconfigured-state
// behaviour. The booted test app has no BACKUP_TARGET_DIR/BACKUP_KEY, so the service is
// "not configured": status reports it, and a manual run is a clean 409 (not a 500).
// See wiki/concepts/backup-recovery.md.

let db: Db;
let close: () => void;
let app: FastifyInstance;

beforeEach(async () => {
  const t = createTestDb();
  db = t.db;
  close = t.close;
  app = await buildServer({ db });
  await app.ready();
});
afterEach(async () => {
  await app.close();
  close();
});

describe("GET /api/backup/status", () => {
  it("401 without a session", async () => {
    const res = await app.inject({ method: "GET", url: "/api/backup/status" });
    expect(res.statusCode).toBe(401);
  });

  it("403 for a user lacking backup:read", async () => {
    const { username, password } = await seedUser(db, {
      username: "viewer", roleId: "viewer", permissions: ["site:read"],
    });
    const { cookie } = await login(app, username, password);
    const res = await app.inject({ method: "GET", url: "/api/backup/status", headers: { cookie } });
    expect(res.statusCode).toBe(403);
  });

  it("an admin sees the (unconfigured) status shape", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie } = await login(app, username, password);
    const res = await app.inject({ method: "GET", url: "/api/backup/status", headers: { cookie } });
    expect(res.statusCode).toBe(200);
    const body = res.json();
    expect(body).toMatchObject({
      configured: false,
      targetDir: null,
      keepLast: 7, // code defaults surfaced when unset
      keepDailyDays: 30,
      running: false,
      lastSuccessAt: null,
      lastError: null,
    });
  });
});

describe("PUT /api/backup/config — admin-chosen target", () => {
  it("403 for a user lacking backup:update", async () => {
    const { username, password } = await seedUser(db, {
      username: "viewer", roleId: "viewer", permissions: ["backup:read"],
    });
    const { cookie, csrf } = await login(app, username, password);
    const res = await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { targetDir: "/tmp/x" },
    });
    expect(res.statusCode).toBe(403);
  });

  it("persists the target dir and reflects it in status", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie, csrf } = await login(app, username, password);
    const put = await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { targetDir: "  /mnt/backup  " }, // trimmed server-side
    });
    expect(put.statusCode).toBe(200);
    expect(put.json()).toMatchObject({ targetDir: "/mnt/backup" });

    const status = await app.inject({ method: "GET", url: "/api/backup/status", headers: { cookie } });
    expect(status.json().targetDir).toBe("/mnt/backup");
  });

  it("clears the target dir when given empty/null", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie, csrf } = await login(app, username, password);
    await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf }, payload: { targetDir: "/mnt/backup" },
    });
    const clear = await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf }, payload: { targetDir: "" },
    });
    expect(clear.json().targetDir).toBeNull();
  });

  it("persists retention and resets to defaults on null", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie, csrf } = await login(app, username, password);

    const set = await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { keepLast: 3, keepDailyDays: 14 },
    });
    expect(set.json()).toMatchObject({ keepLast: 3, keepDailyDays: 14 });

    // null resets to the code default.
    const reset = await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { keepLast: null, keepDailyDays: null },
    });
    expect(reset.json()).toMatchObject({ keepLast: 7, keepDailyDays: 30 });
  });

  it("rejects a negative retention value (400)", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie, csrf } = await login(app, username, password);
    const res = await app.inject({
      method: "PUT", url: "/api/backup/config",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { keepLast: -1 },
    });
    expect(res.statusCode).toBe(400);
  });
});

describe("POST /api/backup/test — path probe", () => {
  it("reports ok for a writable directory and a reason for a missing one", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie, csrf } = await login(app, username, password);

    const good = await app.inject({
      method: "POST", url: "/api/backup/test",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { targetDir: process.cwd() }, // an existing, writable dir
    });
    expect(good.json()).toMatchObject({ ok: true });

    const bad = await app.inject({
      method: "POST", url: "/api/backup/test",
      headers: { cookie, "x-csrf-token": csrf },
      payload: { targetDir: "/no/such/path/here-xyz" },
    });
    expect(bad.json()).toMatchObject({ ok: false, reason: "missing" });
  });
});

describe("POST /api/backup/run", () => {
  it("403 for a user lacking backup:create", async () => {
    const { username, password } = await seedUser(db, {
      username: "viewer", roleId: "viewer", permissions: ["backup:read"], // read but not create
    });
    const { cookie, csrf } = await login(app, username, password);
    const res = await app.inject({
      method: "POST", url: "/api/backup/run",
      headers: { cookie, "x-csrf-token": csrf },
    });
    expect(res.statusCode).toBe(403);
  });

  it("requires CSRF on the mutation", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie } = await login(app, username, password);
    const res = await app.inject({
      method: "POST", url: "/api/backup/run",
      headers: { cookie }, // no csrf header
    });
    expect(res.statusCode).toBe(403);
  });

  it("returns 409 backup_not_configured when no target/key is set (not a 500)", async () => {
    const { username, password } = await seedUser(db, { username: "boss", roleId: "admin" });
    const { cookie, csrf } = await login(app, username, password);
    const res = await app.inject({
      method: "POST", url: "/api/backup/run",
      headers: { cookie, "x-csrf-token": csrf },
    });
    expect(res.statusCode).toBe(409);
    expect(res.json()).toMatchObject({ error: "backup_not_configured" });
  });
});