// Regression tests for the onboarding recall flows: restoring a seed and
// recalling the registered address must land the user in the inbox. The
// client's network operations are stubbed; what is under test is the UI and
// router flow itself.

import "dart:io";

import "package:flutter/material.dart";
import "package:flutter_riverpod/flutter_riverpod.dart";
import "package:flutter_test/flutter_test.dart";
import "package:hive_flutter/hive_flutter.dart";

import "package:smol_mail/data/providers/providers.dart";
import "package:smol_mail/presentation/app_widget.dart";
import "package:smol_mail/smol/client.dart";
import "package:smol_mail/smol/crypto.dart";
import "package:smol_mail/smol/proto.dart";
import "package:smol_mail/smol/store.dart";

/// A [SmolClient] whose recall completes instantly, so the test exercises
/// the flow rather than the network.
class StubClient extends SmolClient {
  StubClient(super.store);

  @override
  Future<SmolAddress> recallAccount(String addressText) async {
    final addr = parseAddress(addressText);
    store.setAccount(addr);
    return addr;
  }
}

void main() {
  // Hive box opening is real file IO and must happen outside testWidgets'
  // fake-async zone — including the per-test stores.
  late final SmolStore storeA, storeB, storeC;
  setUpAll(() async {
    TestWidgetsFlutterBinding.ensureInitialized();
    final dir = await Directory.systemTemp.createTemp("smol-recall-flow");
    Hive.init(dir.path);
    storeA = await SmolStore.open(
        stateBox: "recall-a-state", mailBox: "recall-a-mail");
    storeB = await SmolStore.open(
        stateBox: "recall-b-state", mailBox: "recall-b-mail");
    storeC = await SmolStore.open(
        stateBox: "recall-c-state", mailBox: "recall-c-mail");
  });

  Widget app(SmolStore store) => ProviderScope(
        overrides: [
          storeProvider.overrideWithValue(store),
          clientProvider.overrideWithValue(StubClient(store)),
        ],
        child: const AppWidget(),
      );

  testWidgets(
      "restore with an address, but no pin yet, asks for the server key "
      "and then recalls into the inbox", (tester) async {
    final store = storeA;
    final seed = randomBytes(32);
    await tester.pumpWidget(app(store));
    await tester.pumpAndSettle();
    expect(find.text("Create Identity"), findsOneWidget);

    await tester.tap(find.text("Restore From Seed"));
    await tester.pumpAndSettle();

    var fields = find.byType(TextField);
    expect(fields, findsNWidgets(2));
    await tester.enterText(fields.at(0), hex(seed));
    await tester.enterText(fields.at(1), "randogoth@smol.place");
    await tester.tap(find.text("Restore"));
    await tester.pumpAndSettle();

    // Recall needs the server pinned first (SPEC.md §4) — that's the normal
    // state right after a restore, so this lands on the register step framed
    // for recall (no error, no Invite token field) rather than the inbox yet.
    expect(find.text("Inbox"), findsNothing);
    expect(find.text("Pin this server's public key to finish restoring your address."),
        findsOneWidget);
    expect(find.text("Invite token (optional)"), findsNothing);
    fields = find.byType(TextField);
    expect(fields, findsNWidgets(2)); // address (carried over), server key
    await tester.enterText(fields.at(1), b32encode(randomBytes(32)));
    await tester.tap(find.text("Pin and Recall"));
    await tester.pumpAndSettle();

    expect(find.text("Inbox"), findsOneWidget);
    expect(store.seed(), seed);
    expect(store.account()!.user, "randogoth");
  });

  testWidgets("restore without an address recalls from the register step",
      (tester) async {
    final store = storeB;
    final seed = randomBytes(32);
    await tester.pumpWidget(app(store));
    await tester.pumpAndSettle();

    await tester.tap(find.text("Restore From Seed"));
    await tester.pumpAndSettle();

    var fields = find.byType(TextField);
    await tester.enterText(fields.at(0), hex(seed));
    await tester.tap(find.text("Restore"));
    await tester.pumpAndSettle();

    // The register step: address, server key, optional invite token.
    fields = find.byType(TextField);
    expect(fields, findsNWidgets(3));
    await tester.enterText(fields.at(0), "randogoth@smol.place");
    await tester.enterText(fields.at(1), b32encode(randomBytes(32)));
    await tester.tap(find.text("Already registered? Recall"));
    await tester.pumpAndSettle();

    expect(find.text("Inbox"), findsOneWidget);
    expect(store.account()!.user, "randogoth");
  });

  testWidgets(
      "restoring again after an incomplete attempt replaces the identity "
      "instead of refusing it", (tester) async {
    final store = storeC;
    final abandonedSeed = randomBytes(32);
    final realSeed = randomBytes(32);
    await tester.pumpWidget(app(store));
    await tester.pumpAndSettle();

    // First attempt: restore a seed but never finish registering — lands on
    // the register step, identity set, no account bound.
    await tester.tap(find.text("Restore From Seed"));
    await tester.pumpAndSettle();
    var fields = find.byType(TextField);
    await tester.enterText(fields.at(0), hex(abandonedSeed));
    await tester.tap(find.text("Restore"));
    await tester.pumpAndSettle();
    expect(store.seed(), abandonedSeed);
    expect(store.account(), isNull);

    // Simulate returning to onboarding later (e.g. a cold restart). Pumping
    // app(store) directly would just rebuild the existing OnboardingScreen
    // state in place (still parked on the register step) rather than really
    // restarting, so tear the tree down first to force a fresh app state —
    // HomeGuard then sends an identity-without-account back to welcome.
    await tester.pumpWidget(const SizedBox());
    await tester.pumpWidget(app(store));
    await tester.pumpAndSettle();
    expect(find.text("Create Identity"), findsOneWidget);

    // Restoring a different seed must not throw "identity already exists".
    await tester.tap(find.text("Restore From Seed"));
    await tester.pumpAndSettle();
    fields = find.byType(TextField);
    await tester.enterText(fields.at(0), hex(realSeed));
    await tester.enterText(fields.at(1), "randogoth@smol.place");
    await tester.tap(find.text("Restore"));
    await tester.pumpAndSettle();

    // Lands on the recall-framed register step (no pin yet); pin it and finish.
    fields = find.byType(TextField);
    expect(fields, findsNWidgets(2));
    await tester.enterText(fields.at(1), b32encode(randomBytes(32)));
    await tester.tap(find.text("Pin and Recall"));
    await tester.pumpAndSettle();

    expect(find.text("Inbox"), findsOneWidget);
    expect(store.seed(), realSeed);
  });
}