// Store-level behavior: contact key history (§8), import binding, and the
// export/import backup file.

import "dart:convert";
import "dart:io";

import "package:flutter_test/flutter_test.dart";
import "package:hive_flutter/hive_flutter.dart";

import "package:smol_mail/smol/client.dart";
import "package:smol_mail/smol/crypto.dart";
import "package:smol_mail/smol/errors.dart";
import "package:smol_mail/smol/proto.dart";
import "package:smol_mail/smol/store.dart";

// Each store gets its own boxes; Hive is a per-process singleton, so without
// this the "exporting" and "importing" stores would be the same store.
Future<SmolStore> freshStore(String tag) =>
    SmolStore.open(stateBox: "test-$tag-state", mailBox: "test-$tag-mail");

void main() {
  setUpAll(() async {
    TestWidgetsFlutterBinding.ensureInitialized();
    final dir = await Directory.systemTemp.createTemp("smol-store-test");
    Hive.init(dir.path);
  });

  test("contact history keeps displaced keys, not re-saves", () async {
    final store = await freshStore("history");
    final a = randomBytes(32), b = randomBytes(32), c = randomBytes(32);

    store.saveContact("alice@example.org", a, true);
    expect(store.contact("alice@example.org")!.history, isEmpty);

    store.saveContact("alice@example.org", b, false);
    final rotated = store.contact("alice@example.org")!;
    expect(rotated.key, b);
    expect(rotated.history.length, 1);
    expect(rotated.history.first.key, a);
    expect(rotated.history.first.until, greaterThan(0));

    // Re-saving the same key is not a rotation and must not add an entry.
    store.saveContact("alice@example.org", b, true);
    expect(store.contact("alice@example.org")!.history.length, 1);

    // A second displacement appends, oldest first.
    store.saveContact("alice@example.org", c, false);
    final history = store.contact("alice@example.org")!.history;
    expect(history.length, 2);
    expect(history[0].key, a);
    expect(history[1].key, b);
    expect(store.allContacts().single.$2.history.length, 2);
  });

  test("importContact binds a smol:// address to the key it carries", () async {
    final store = await freshStore("import-contact");
    final client = SmolClient(store);
    final identity = identityFromSeed(randomBytes(32));
    client.importContact(
        "smol://bob@example.org/${b32encode(identity.publicKey)}");
    final saved = store.contact("bob@example.org")!;
    expect(saved.verified, isTrue);
    expect(saved.key, identity.publicKey);
  });

  test("export never contains the seed and round-trips through import",
      () async {
    final a = await freshStore("export");
    final b = await freshStore("round-trip");
    a.setIdentity(randomBytes(32));
    a.pinServer("example.org", randomBytes(32));
    a.saveContact("alice@example.org", randomBytes(32), true);
    a.saveContact("alice@example.org", randomBytes(32), false); // history grows
    await a.storeMessage(
        "inbox", MailRecord("aa", randomBytes(64), receivedAt: 5));
    await a.storeMessage("sent",
        MailRecord("bb", randomBytes(64), recipient: "bob@example.org", sentAt: 6));

    final data = a.exportData();
    expect(data["gsmolExport"], 2); // sealed to the identity's seed, like gsmol
    expect(jsonEncode(data).contains(hex(a.seed()!)), isFalse);

    // v2 is sealed to the exporting identity's seed — a restore-on-new-device
    // scenario, not a transfer to someone else's identity (see the test below).
    b.setIdentity(a.seed()!);
    final summary = await b.importData(data);
    expect(summary.mailAdded, 2);
    expect(summary.pinsAdded, 1);
    expect(summary.contactsAdded, 1);
    expect(b.serverPin("example.org"), a.serverPin("example.org"));
    expect(b.contact("alice@example.org")!.history.length, 1);
    expect(b.getMessage("inbox", "aa"), isNotNull);
    expect(b.getMessage("sent", "bb"), isNotNull);
  });

  test("v2 import refuses a different identity's export", () async {
    final a = await freshStore("export-wrong-identity");
    final c = await freshStore("round-trip-wrong-identity");
    a.setIdentity(randomBytes(32));
    a.pinServer("example.org", randomBytes(32));
    final data = a.exportData();

    c.setIdentity(randomBytes(32)); // a different seed than a's
    expect(() => c.importData(data), throwsA(isA<SmolError>()));
  });

  test("v1 legacy export still imports without an identity", () async {
    final store = await freshStore("import-legacy-v1");
    final summary = await store.importData({
      "gsmolExport": 1,
      "servers": {"example.org": b32encode(randomBytes(32))},
    });
    expect(summary.pinsAdded, 1);
  });

  test("import never overwrites a differing trust binding", () async {
    final store = await freshStore("conflict");
    final mine = randomBytes(32), other = randomBytes(32);
    store.pinServer("example.org", mine);
    store.saveContact("alice@example.org", mine, true);
    final summary = await store.importData({
      "gsmolExport": 1,
      "servers": {"example.org": b32encode(other)},
      "contacts": {
        "alice@example.org": {"key": b32encode(other), "verified": true},
        "bob@example.org": {"key": b32encode(randomBytes(32)), "verified": false},
      },
    });
    expect(summary.pinsConflicted, 1);
    expect(summary.pinsAdded, 0);
    expect(summary.contactsConflicted, 1);
    expect(summary.contactsAdded, 1);
    expect(store.serverPin("example.org"), mine);
    expect(store.contact("alice@example.org")!.key, mine);
    expect(store.contact("bob@example.org"), isNotNull);
  });

  test("import skips malformed entries and rejects wrong files", () async {
    final store = await freshStore("malformed");
    final summary = await store.importData({
      "gsmolExport": 1,
      "servers": {"bad": "notbase32!", "short": b32encode(randomBytes(8))},
      "contacts": {
        "x": {"key": "nope"},
        "y": "not a record",
      },
      "inbox": [
        {"id": "ok", "envelope": base64Encode(randomBytes(64)), "receivedAt": 1},
        {"id": "bad", "envelope": "!!!not base64!!!"},
        "not a record",
      ],
      "sent": "not a list",
    });
    expect(summary.malformed, 7); // 2 pins, 2 contacts, 2 mail, 1 sent
    expect(summary.pinsAdded, 0);
    expect(summary.mailAdded, 1);
    expect(store.getMessage("inbox", "ok"), isNotNull);
    expect(store.getMessage("inbox", "bad"), isNull);

    expect(() => store.importData({"nope": 1}), throwsA(isA<SmolError>()));
  });
}