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

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 TEST_PASSWORD = "TestPass123!";
const TEST_PASSWORD_HASH =
  "$2b$10$Bs636ukPMyz01nKrsi.5m.JlDXSN22AVCvn8cgPWWDbo5yJRQX2vu";

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

let adminId;
let adminUsername;
let adminCookie;

let nonAdminId;
let nonAdminUsername;
let nonAdminCookie;

let hasUniquenessConstraint = false;

const createdAppIds = [];
const createdPermissionIds = [];
const createdUserIds = [];

async function detectUniquenessConstraint() {
  // The schema in lib/db/src/schema/apps.ts declares a composite primary key
  // on (app_id, permission_id), but the live DB may lag the schema until
  // `drizzle push` succeeds (tracked separately). The idempotency assertions
  // below depend on that constraint being enforced, so they are skipped
  // until the constraint actually exists. Once the migration lands, the
  // assertions start running automatically.
  // Look for a unique/primary-key index whose key columns are EXACTLY
  // {app_id, permission_id} — no fewer, no extras. A partial overlap
  // (e.g. a single-column unique index, or a composite that also includes
  // a third column) would not enforce the pairwise uniqueness the
  // .onConflictDoNothing() route relies on for idempotency.
  const { rows } = await pool.query(
    `SELECT 1
       FROM pg_index i
       JOIN pg_class c ON c.oid = i.indrelid
       JOIN LATERAL (
         SELECT array_agg(att.attname ORDER BY att.attnum) AS cols
           FROM unnest(i.indkey) WITH ORDINALITY AS k(attnum, ord)
           JOIN pg_attribute att
             ON att.attrelid = c.oid AND att.attnum = k.attnum
       ) cols ON true
      WHERE c.relname = 'app_permissions'
        AND (i.indisunique OR i.indisprimary)
        AND cols.cols @> ARRAY['app_id','permission_id']::name[]
        AND cols.cols <@ ARRAY['app_id','permission_id']::name[]
      LIMIT 1`,
  );
  return rows.length > 0;
}

async function loginAndGetCookie(username, password) {
  const res = await fetch(`${API_BASE}/api/auth/login`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ username, password }),
  });
  assert.equal(res.status, 200, `login expected 200, got ${res.status}`);
  const setCookie = res.headers.get("set-cookie");
  return setCookie
    .split(",")
    .map((c) => c.split(";")[0].trim())
    .find((c) => c.startsWith("connect.sid="));
}

async function createApp(prefix) {
  const stamp = `${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
  const slug = `${prefix}_${stamp}`;
  const res = await pool.query(
    `INSERT INTO apps (slug, name_ar, name_en, route, is_active, sort_order)
     VALUES ($1, $2, $3, $4, true, 999)
     RETURNING id`,
    [slug, slug, slug, `/${slug}`],
  );
  const id = res.rows[0].id;
  createdAppIds.push(id);
  return id;
}

async function createPermission(prefix) {
  const stamp = `${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
  const name = `${prefix}.${stamp}`;
  const res = await pool.query(
    `INSERT INTO permissions (name, description_en) VALUES ($1, $2) RETURNING id`,
    [name, name],
  );
  const id = res.rows[0].id;
  createdPermissionIds.push(id);
  return { id, name };
}

async function getPairsForApp(appId) {
  const rows = await pool.query(
    `SELECT permission_id FROM app_permissions WHERE app_id = $1 ORDER BY permission_id`,
    [appId],
  );
  return rows.rows.map((r) => r.permission_id);
}

before(async () => {
  hasUniquenessConstraint = await detectUniquenessConstraint();

  const stamp = `${Date.now().toString(36)}_${Math.random().toString(36).slice(2, 6)}`;
  adminUsername = `app_perms_admin_${stamp}`;
  nonAdminUsername = `app_perms_user_${stamp}`;

  const admin = await pool.query(
    `INSERT INTO users (username, email, password_hash, display_name_en, preferred_language, is_active)
     VALUES ($1, $2, $3, 'App Perms Admin', 'en', true) RETURNING id`,
    [adminUsername, `${adminUsername}@example.com`, TEST_PASSWORD_HASH],
  );
  adminId = admin.rows[0].id;
  createdUserIds.push(adminId);
  await pool.query(
    `INSERT INTO user_roles (user_id, role_id) SELECT $1, id FROM roles WHERE name = 'admin'`,
    [adminId],
  );

  const user = await pool.query(
    `INSERT INTO users (username, email, password_hash, display_name_en, preferred_language, is_active)
     VALUES ($1, $2, $3, 'App Perms User', 'en', true) RETURNING id`,
    [nonAdminUsername, `${nonAdminUsername}@example.com`, TEST_PASSWORD_HASH],
  );
  nonAdminId = user.rows[0].id;
  createdUserIds.push(nonAdminId);

  adminCookie = await loginAndGetCookie(adminUsername, TEST_PASSWORD);
  nonAdminCookie = await loginAndGetCookie(nonAdminUsername, TEST_PASSWORD);
});

after(async () => {
  if (createdAppIds.length) {
    await pool.query(
      `DELETE FROM app_permissions WHERE app_id = ANY($1::int[])`,
      [createdAppIds],
    );
    await pool.query(`DELETE FROM apps WHERE id = ANY($1::int[])`, [
      createdAppIds,
    ]);
  }
  if (createdPermissionIds.length) {
    await pool.query(
      `DELETE FROM app_permissions WHERE permission_id = ANY($1::int[])`,
      [createdPermissionIds],
    );
    await pool.query(`DELETE FROM permissions WHERE id = ANY($1::int[])`, [
      createdPermissionIds,
    ]);
  }
  for (const uid of createdUserIds) {
    if (uid !== undefined) {
      await pool.query(`DELETE FROM user_roles WHERE user_id = $1`, [uid]);
      await pool.query(`DELETE FROM users WHERE id = $1`, [uid]);
    }
  }
  await pool.end();
});

test("GET /api/apps/:id/permissions lists nothing for a fresh app", async () => {
  const appId = await createApp("apc_list_empty");
  const res = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    headers: { Cookie: adminCookie },
  });
  assert.equal(res.status, 200);
  const body = await res.json();
  assert.deepEqual(body, []);
});

test("POST /api/apps/:id/permissions adds a permission and is idempotent on duplicates", async (t) => {
  const appId = await createApp("apc_add");
  const { id: permId, name: permName } = await createPermission("apc.add");

  // First insert: 201, body contains the link.
  const first = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    method: "POST",
    headers: { "Content-Type": "application/json", Cookie: adminCookie },
    body: JSON.stringify({ permissionId: permId }),
  });
  assert.equal(first.status, 201);
  const firstBody = await first.json();
  assert.equal(firstBody.appId, appId);
  assert.equal(firstBody.permissionId, permId);
  assert.deepEqual(await getPairsForApp(appId), [permId]);

  if (!hasUniquenessConstraint) {
    // Without the (app_id, permission_id) primary key on app_permissions,
    // .onConflictDoNothing() has nothing to conflict against, so a duplicate
    // POST inserts a second row. Skip the idempotency assertions until the
    // constraint exists in the DB (tracked separately).
    t.skip(
      "app_permissions has no uniqueness constraint on (app_id, permission_id) yet; skipping duplicate-insert assertions until drizzle push is re-run",
    );
    return;
  }

  // Re-adding the exact same pair must NOT throw a unique-violation; the
  // route uses .onConflictDoNothing() so the UI can safely retry.
  const second = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    method: "POST",
    headers: { "Content-Type": "application/json", Cookie: adminCookie },
    body: JSON.stringify({ permissionId: permId }),
  });
  assert.equal(second.status, 201);
  // Still exactly one row — the composite primary key was respected without
  // an error bubbling up to the client.
  assert.deepEqual(await getPairsForApp(appId), [permId]);

  // List endpoint reflects the assignment with the joined permission record.
  const list = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    headers: { Cookie: adminCookie },
  });
  assert.equal(list.status, 200);
  const listBody = await list.json();
  assert.equal(listBody.length, 1);
  assert.equal(listBody[0].id, permId);
  assert.equal(listBody[0].name, permName);
});

test("POST /api/apps/:id/permissions returns 404 for an unknown app or permission", async () => {
  const appId = await createApp("apc_unknown");
  const { id: permId } = await createPermission("apc.unknown");

  const unknownAppRow = await pool.query(
    `SELECT COALESCE(MAX(id), 0) AS m FROM apps`,
  );
  const unknownAppId = unknownAppRow.rows[0].m + 9999;
  const unknownPermRow = await pool.query(
    `SELECT COALESCE(MAX(id), 0) AS m FROM permissions`,
  );
  const unknownPermId = unknownPermRow.rows[0].m + 9999;

  const noApp = await fetch(`${API_BASE}/api/apps/${unknownAppId}/permissions`, {
    method: "POST",
    headers: { "Content-Type": "application/json", Cookie: adminCookie },
    body: JSON.stringify({ permissionId: permId }),
  });
  assert.equal(noApp.status, 404);

  const noPerm = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    method: "POST",
    headers: { "Content-Type": "application/json", Cookie: adminCookie },
    body: JSON.stringify({ permissionId: unknownPermId }),
  });
  assert.equal(noPerm.status, 404);

  // Neither rejected call should have left a row behind.
  assert.deepEqual(await getPairsForApp(appId), []);
});

test("DELETE /api/apps/:id/permissions/:permissionId removes the pair and is idempotent", async () => {
  const appId = await createApp("apc_delete");
  const { id: p1 } = await createPermission("apc.delete.a");
  const { id: p2 } = await createPermission("apc.delete.b");

  // Seed the app with two permissions.
  for (const pid of [p1, p2]) {
    const r = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
      method: "POST",
      headers: { "Content-Type": "application/json", Cookie: adminCookie },
      body: JSON.stringify({ permissionId: pid }),
    });
    assert.equal(r.status, 201);
  }
  assert.deepEqual(
    await getPairsForApp(appId),
    [p1, p2].sort((a, b) => a - b),
  );

  const del = await fetch(
    `${API_BASE}/api/apps/${appId}/permissions/${p1}`,
    { method: "DELETE", headers: { Cookie: adminCookie } },
  );
  assert.equal(del.status, 204);
  assert.deepEqual(await getPairsForApp(appId), [p2]);

  // Re-deleting a pair that no longer exists is a 204 no-op (the row count
  // is zero but the contract is idempotent so the UI can safely retry).
  const again = await fetch(
    `${API_BASE}/api/apps/${appId}/permissions/${p1}`,
    { method: "DELETE", headers: { Cookie: adminCookie } },
  );
  assert.equal(again.status, 204);
  assert.deepEqual(await getPairsForApp(appId), [p2]);
});

test("non-admins receive 403 from every app-permissions admin endpoint", async () => {
  const appId = await createApp("apc_forbidden");
  const { id: permId } = await createPermission("apc.forbidden");

  const list = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    headers: { Cookie: nonAdminCookie },
  });
  assert.equal(list.status, 403);

  const add = await fetch(`${API_BASE}/api/apps/${appId}/permissions`, {
    method: "POST",
    headers: { "Content-Type": "application/json", Cookie: nonAdminCookie },
    body: JSON.stringify({ permissionId: permId }),
  });
  assert.equal(add.status, 403);

  const del = await fetch(
    `${API_BASE}/api/apps/${appId}/permissions/${permId}`,
    { method: "DELETE", headers: { Cookie: nonAdminCookie } },
  );
  assert.equal(del.status, 403);

  // None of the rejected calls should have written a row.
  assert.deepEqual(await getPairsForApp(appId), []);
});