import { test, after, before } from "node:test";
import assert from "node:assert/strict";
import pg from "pg";

// IMPORTANT: this file mutates shared tables (system_settings, user_roles)
// during snapshot/restore. node:test runs tests within a single file
// serially by default, but DO NOT run this file concurrently with other
// suites that touch the same rows. The repository-level `test` workflow
// runs api-server tests as one `node --test 'tests/**/*.test.mjs'` invocation
// which executes files in parallel — keep this file in its own logical
// group (already enforced by the snapshot/restore around every assertion)
// or migrate to a dedicated test schema if you add adjacent suites that
// also touch system_settings.
const API_BASE = process.env.TEST_API_BASE ?? "http://localhost:8080";
const DATABASE_URL = process.env.DATABASE_URL;
if (!DATABASE_URL) throw new Error("DATABASE_URL must be set to run these tests");

const pool = new pg.Pool({ connectionString: DATABASE_URL });

// ----- snapshot + restore helpers -------------------------------------------------
// The setup-wizard test needs to run against a DB that has NO admin and
// `system_settings.installed=false`. The shared dev DB already has both
// (seed runs at boot), so we snapshot the relevant rows, blank them
// out, run the test, then restore exactly what was there.
let snapshot = {
  systemSettings: null,
  adminUserIds: [],
  adminUserRoleRows: [],
  createdUsernames: [],
};

const TEST_USERNAME = `setupwiz_${Date.now().toString(36)}_${Math.random()
  .toString(36)
  .slice(2, 8)}`;
const TEST_EMAIL = `${TEST_USERNAME}@tx.local`;

before(async () => {
  // Snapshot system_settings.
  const sysRow = await pool.query("SELECT * FROM system_settings WHERE id = 1");
  snapshot.systemSettings = sysRow.rows[0] ?? null;

  // Snapshot every user with the admin role + their user_roles edges.
  const adminRow = await pool.query(
    "SELECT id FROM roles WHERE name = 'admin' LIMIT 1",
  );
  if (adminRow.rowCount === 0) {
    throw new Error("admin role missing in DB — seed first");
  }
  const adminRoleId = adminRow.rows[0].id;

  const adminUsers = await pool.query(
    `SELECT u.id FROM users u
       JOIN user_roles ur ON ur.user_id = u.id
       WHERE ur.role_id = $1`,
    [adminRoleId],
  );
  snapshot.adminUserIds = adminUsers.rows.map((r) => r.id);

  // Detach admin role from those users so the open-setup gate kicks in.
  if (snapshot.adminUserIds.length > 0) {
    const detached = await pool.query(
      `DELETE FROM user_roles WHERE role_id = $1 AND user_id = ANY($2::int[])
       RETURNING user_id, role_id`,
      [adminRoleId, snapshot.adminUserIds],
    );
    snapshot.adminUserRoleRows = detached.rows;
  }

  // Wipe install flag so the wizard treats this as a fresh install.
  await pool.query("DELETE FROM system_settings WHERE id = 1");
});

after(async () => {
  // Remove any user the test created.
  if (snapshot.createdUsernames.length > 0) {
    await pool.query(
      "DELETE FROM user_roles WHERE user_id IN (SELECT id FROM users WHERE username = ANY($1::text[]))",
      [snapshot.createdUsernames],
    );
    await pool.query(
      "DELETE FROM user_groups WHERE user_id IN (SELECT id FROM users WHERE username = ANY($1::text[]))",
      [snapshot.createdUsernames],
    );
    await pool.query("DELETE FROM users WHERE username = ANY($1::text[])", [
      snapshot.createdUsernames,
    ]);
  }

  // Restore system_settings to its pre-test state.
  await pool.query("DELETE FROM system_settings WHERE id = 1");
  if (snapshot.systemSettings) {
    const r = snapshot.systemSettings;
    await pool.query(
      `INSERT INTO system_settings
         (id, installed, installed_at, base_url, local_domain, local_ip, https_mode, app_version, updated_at)
       VALUES (1, $1, $2, $3, $4, $5, $6, $7, $8)`,
      [
        r.installed,
        r.installed_at,
        r.base_url,
        r.local_domain,
        r.local_ip,
        r.https_mode,
        r.app_version,
        r.updated_at,
      ],
    );
  }

  // Re-attach the admin role to the original admin users.
  if (snapshot.adminUserRoleRows.length > 0) {
    for (const row of snapshot.adminUserRoleRows) {
      await pool.query(
        `INSERT INTO user_roles (user_id, role_id) VALUES ($1, $2)
         ON CONFLICT DO NOTHING`,
        [row.user_id, row.role_id],
      );
    }
  }

  await pool.end();
});

test("GET /api/setup/status reports setupRequired=true on a fresh DB", async () => {
  const res = await fetch(`${API_BASE}/api/setup/status`);
  assert.equal(res.status, 200);
  const body = await res.json();
  assert.equal(body.installed, false);
  assert.equal(body.setupRequired, true);
  assert.equal(body.checks.db, "ok");
  assert.ok(typeof body.appVersion === "string");
});

test("POST /api/setup/validate returns ok for a clean payload", async () => {
  const res = await fetch(`${API_BASE}/api/setup/validate`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      admin: {
        username: TEST_USERNAME,
        email: TEST_EMAIL,
        password: "ValidPass123!",
      },
    }),
  });
  assert.equal(res.status, 200);
  const body = await res.json();
  assert.equal(body.ok, true);
});

test("POST /api/setup/validate returns 400 + per-field errors for invalid input", async () => {
  const res = await fetch(`${API_BASE}/api/setup/validate`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      admin: { username: "x", email: "not-an-email", password: "short" },
    }),
  });
  assert.equal(res.status, 400);
  const body = await res.json();
  assert.equal(body.ok, false);
  assert.ok(body.errors);
});

test("POST /api/setup/complete creates the admin and flips installed", async () => {
  const res = await fetch(`${API_BASE}/api/setup/complete`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      admin: {
        username: TEST_USERNAME,
        email: TEST_EMAIL,
        password: "ValidPass123!",
        displayNameEn: "Wizard Test Admin",
      },
      baseUrl: "https://tx.test.local",
      localDomain: "tx.test.local",
      localIp: "192.0.2.42",
      httpsMode: "local",
    }),
  });
  assert.equal(res.status, 200);
  const body = await res.json();
  assert.equal(body.ok, true);
  snapshot.createdUsernames.push(TEST_USERNAME);

  // Verify directly in DB.
  const userRow = await pool.query(
    "SELECT id FROM users WHERE username = $1",
    [TEST_USERNAME],
  );
  assert.equal(userRow.rowCount, 1);
  const newId = userRow.rows[0].id;

  const roleRow = await pool.query(
    `SELECT 1 FROM user_roles ur
       JOIN roles r ON r.id = ur.role_id
       WHERE ur.user_id = $1 AND r.name = 'admin'`,
    [newId],
  );
  assert.equal(roleRow.rowCount, 1);

  const sys = await pool.query("SELECT * FROM system_settings WHERE id = 1");
  assert.equal(sys.rows[0].installed, true);
  assert.equal(sys.rows[0].local_domain, "tx.test.local");
  assert.equal(sys.rows[0].https_mode, "local");
  assert.ok(sys.rows[0].installed_at);
});

test("Second POST /api/setup/complete returns 409 already_installed", async () => {
  const res = await fetch(`${API_BASE}/api/setup/complete`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      admin: {
        username: `${TEST_USERNAME}_again`,
        email: `${TEST_USERNAME}_again@tx.local`,
        password: "ValidPass123!",
      },
    }),
  });
  assert.equal(res.status, 409);
  const body = await res.json();
  assert.equal(body.error, "already_installed");
});

test("POST /api/setup/validate returns 409 once installed", async () => {
  const res = await fetch(`${API_BASE}/api/setup/validate`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      admin: {
        username: "ignored",
        email: "ignored@tx.local",
        password: "ValidPass123!",
      },
    }),
  });
  assert.equal(res.status, 409);
});

test("GET /api/setup/status reports setupRequired=false after install", async () => {
  const res = await fetch(`${API_BASE}/api/setup/status`);
  assert.equal(res.status, 200);
  const body = await res.json();
  assert.equal(body.installed, true);
  assert.equal(body.setupRequired, false);
});

// Contract test for redirectIfSetupNeeded(): Stage 2 SPA routing depends on
// this helper returning a {shouldRedirect, target, status} shape with a
// /setup target only when setup is open. Asserted via /api/setup/status
// since the helper is the source of truth for that response.
test("redirectIfSetupNeeded contract: shouldRedirect=false post-install", async () => {
  // We're past the "complete" test, so installed=true. Status must reflect
  // that setup is closed; Stage 2's hook reads the same payload.
  const res = await fetch(`${API_BASE}/api/setup/status`);
  assert.equal(res.status, 200);
  const body = await res.json();
  assert.equal(body.installed, true);
  assert.equal(body.setupRequired, false);
  // The redirect-decision contract: shouldRedirect MUST be false whenever
  // installed=true OR setupRequired=false. Stage 2's hook must mirror this.
  const shouldRedirect =
    body.checks.db === "ok" && !body.installed && body.setupRequired;
  assert.equal(shouldRedirect, false);
});

// Regression: scripts/src/seed.ts inserts a bootstrap (id=1, installed=false)
// row early. The seeded-admin branch later flips installed=true. The flip
// MUST be a DO UPDATE — a DO NOTHING would silently leave installed=false
// because the row already exists. This test exercises the same SQL the
// seed uses so a future refactor cannot regress that behavior.
test("seed flip from installed=false to installed=true uses DO UPDATE", async () => {
  // Save current row to restore at the end so we don't disturb other tests.
  const before = await pool.query("SELECT * FROM system_settings WHERE id = 1");
  const beforeRow = before.rows[0] ?? null;

  // Step 1: bootstrap insert (mirrors seed lines 123-126).
  await pool.query(
    `INSERT INTO system_settings (id, installed) VALUES (1, false)
     ON CONFLICT (id) DO UPDATE SET installed = false, installed_at = NULL`,
  );
  const mid = await pool.query(
    "SELECT installed FROM system_settings WHERE id = 1",
  );
  assert.equal(mid.rows[0].installed, false, "bootstrap should leave installed=false");

  // Step 2: seeded-admin branch flip (mirrors seed lines 217-227).
  await pool.query(
    `INSERT INTO system_settings (id, installed, installed_at)
     VALUES (1, true, NOW())
     ON CONFLICT (id) DO UPDATE SET
       installed = true,
       installed_at = COALESCE(system_settings.installed_at, NOW()),
       updated_at = NOW()`,
  );
  const after = await pool.query(
    "SELECT installed, installed_at FROM system_settings WHERE id = 1",
  );
  assert.equal(after.rows[0].installed, true, "seed flip must set installed=true");
  assert.ok(after.rows[0].installed_at !== null, "installed_at must be set");

  // Restore.
  if (beforeRow) {
    await pool.query(
      `INSERT INTO system_settings (id, installed, installed_at, base_url, local_domain, local_ip, https_mode, app_version, updated_at)
       VALUES (1, $1, $2, $3, $4, $5, $6, $7, $8)
       ON CONFLICT (id) DO UPDATE SET
         installed = EXCLUDED.installed,
         installed_at = EXCLUDED.installed_at,
         base_url = EXCLUDED.base_url,
         local_domain = EXCLUDED.local_domain,
         local_ip = EXCLUDED.local_ip,
         https_mode = EXCLUDED.https_mode,
         app_version = EXCLUDED.app_version,
         updated_at = EXCLUDED.updated_at`,
      [
        beforeRow.installed,
        beforeRow.installed_at,
        beforeRow.base_url,
        beforeRow.local_domain,
        beforeRow.local_ip,
        beforeRow.https_mode,
        beforeRow.app_version,
        beforeRow.updated_at,
      ],
    );
  }
});