import 'dart:async';

import 'package:flutter_test/flutter_test.dart';
import 'package:tasq/providers/tasks_provider.dart';
import 'package:tasq/models/task.dart';
import 'package:tasq/models/task_activity_log.dart';
import 'package:tasq/utils/app_time.dart';

// Minimal fake supabase client similar to integration test work,
// only implements the methods used by TasksController.
class _FakeClient {
  final Map<String, List<Map<String, dynamic>>> tables = {
    'tasks': [],
    'task_activity_logs': [],
    'task_assignments': [],
    'profiles': [],
  };

  _FakeQuery from(String table) => _FakeQuery(this, table);
}

/// A chainable fake query that also implements `Future<List<Map>>` so that
/// `await client.from('t').select().eq('id', x)` returns the filtered rows
/// rather than throwing a cast error.
class _FakeQuery implements Future<List<Map<String, dynamic>>> {
  _FakeQuery(this.client, this.table);

  final _FakeClient client;
  final String table;
  Map<String, dynamic>? _eq;
  Map<String, dynamic>? _insertPayload;
  Map<String, dynamic>? _updatePayload;
  String? _inFilterField;
  List<String>? _inFilterValues;

  List<Map<String, dynamic>> get _filteredRows {
    var rows = List<Map<String, dynamic>>.from(client.tables[table] ?? []);
    if (_inFilterField != null && _inFilterValues != null) {
      rows = rows
          .where((r) =>
              _inFilterValues!.contains(r[_inFilterField]?.toString()))
          .toList();
    }
    if (_eq != null) {
      final field = _eq!.keys.first;
      final value = _eq![field];
      rows = rows.where((r) => r[field] == value).toList();
    }
    return rows;
  }

  // Future<List<Map>> delegation so `await fakeQuery` returns the list.
  Future<List<Map<String, dynamic>>> get _asFuture =>
      Future.value(_filteredRows);

  @override
  Stream<List<Map<String, dynamic>>> asStream() => _asFuture.asStream();

  @override
  Future<List<Map<String, dynamic>>> catchError(
    Function onError, {
    bool Function(Object error)? test,
  }) =>
      _asFuture.catchError(onError, test: test);

  @override
  Future<R> then<R>(
    FutureOr<R> Function(List<Map<String, dynamic>> value) onValue, {
    Function? onError,
  }) =>
      _asFuture.then(onValue, onError: onError);

  @override
  Future<List<Map<String, dynamic>>> timeout(
    Duration timeLimit, {
    FutureOr<List<Map<String, dynamic>>> Function()? onTimeout,
  }) =>
      _asFuture.timeout(timeLimit, onTimeout: onTimeout);

  @override
  Future<List<Map<String, dynamic>>> whenComplete(
    FutureOr<void> Function() action,
  ) =>
      _asFuture.whenComplete(action);

  // Query builder methods

  _FakeQuery select([String? _]) => this;

  _FakeQuery inFilter(String field, List<dynamic> values) {
    _inFilterField = field;
    _inFilterValues = values.map((v) => v.toString()).toList();
    return this;
  }

  Future<Map<String, dynamic>?> maybeSingle() async {
    final rows = _filteredRows;
    if (rows.isEmpty) return null;
    return Map<String, dynamic>.from(rows.first);
  }

  _FakeQuery insert(Map<String, dynamic> payload) {
    _insertPayload = Map<String, dynamic>.from(payload);
    return this;
  }

  Future<Map<String, dynamic>> single() async {
    if (_insertPayload != null) {
      final id = 'tsk-${client.tables['tasks']!.length + 1}';
      final row = Map<String, dynamic>.from(_insertPayload!);
      row['id'] = id;
      client.tables[table]!.add(row);
      return Map<String, dynamic>.from(row);
    }
    throw Exception('unexpected single() call');
  }

  _FakeQuery update(Map<String, dynamic> payload) {
    _updatePayload = payload;
    // don't apply yet; wait for eq to know which row
    return this;
  }

  _FakeQuery eq(String field, dynamic value) {
    _eq = {field: value};
    // apply update payload now that we know which row to target
    if (_updatePayload != null) {
      final idx = client.tables[table]!.indexWhere((r) => r[field] == value);
      if (idx >= 0) {
        client.tables[table]![idx] = {
          ...client.tables[table]![idx],
          ..._updatePayload!,
        };
      }
      // clear payload after applying so subsequent eq calls don't reapply
      _updatePayload = null;
    }
    return this;
  }
}

void main() {
  group('TasksController business rules', () {
    late _FakeClient fake;
    late TasksController controller;

    setUp(() {
      fake = _FakeClient();
      controller = TasksController(fake as dynamic);
      // ignore: avoid_dynamic_calls
      // note: controller expects SupabaseClient; using dynamic bypass.
    });

    test('cannot complete a task without required metadata', () async {
      // insert a task with no metadata at all
      final row = {'id': 'tsk-1', 'status': 'queued'};
      fake.tables['tasks']!.add(row);

      expect(
        () => controller.updateTaskStatus(taskId: 'tsk-1', status: 'completed'),
        throwsA(isA<Exception>()),
      );
    });

    test('cannot complete when action taken is missing', () async {
      // insert a task that has the basic request metadata but nothing else
      final row = {
        'id': 'tsk-3',
        'status': 'queued',
        'request_type': 'Repair',
        'request_category': 'Hardware',
      };
      fake.tables['tasks']!.add(row);

      // missing actionTaken should still prevent completion even though
      // signatories are not required.
      expect(
        () => controller.updateTaskStatus(taskId: 'tsk-3', status: 'completed'),
        throwsA(isA<Exception>()),
      );

      // add some signatories but no actionTaken yet
      await controller.updateTask(
        taskId: 'tsk-3',
        requestedBy: 'Alice',
        notedBy: 'Bob',
        receivedBy: 'Carol',
      );
      expect(
        () => controller.updateTaskStatus(taskId: 'tsk-3', status: 'completed'),
        throwsA(isA<Exception>()),
      );

      // once action taken is provided completion should succeed even if
      // signatories remain empty (they already have values here, but the
      // previous checks show they aren't required).
      // An IT staff assignment is also required before completion.
      fake.tables['task_assignments']!
          .add({'task_id': 'tsk-3', 'user_id': 'it-1'});
      fake.tables['profiles']!.add({'id': 'it-1', 'role': 'it_staff'});
      await controller.updateTask(taskId: 'tsk-3', actionTaken: '{}');
      await controller.updateTaskStatus(taskId: 'tsk-3', status: 'completed');
      expect(
        fake.tables['tasks']!.firstWhere((t) => t['id'] == 'tsk-3')['status'],
        'completed',
      );
    });

    test('completing after adding metadata succeeds', () async {
      // insert a task
      final row = {'id': 'tsk-2', 'status': 'queued'};
      fake.tables['tasks']!.add(row);

      // An IT staff assignment is required before completion.
      fake.tables['task_assignments']!
          .add({'task_id': 'tsk-2', 'user_id': 'it-1'});
      fake.tables['profiles']!.add({'id': 'it-1', 'role': 'it_staff'});

      // update metadata via updateTask including actionTaken
      await controller.updateTask(
        taskId: 'tsk-2',
        requestType: 'Repair',
        requestCategory: 'Hardware',
        actionTaken: '{}',
      );

      await controller.updateTaskStatus(taskId: 'tsk-2', status: 'completed');
      expect(
        fake.tables['tasks']!.firstWhere((t) => t['id'] == 'tsk-2')['status'],
        'completed',
      );
    });

    test('Task.hasIncompleteDetails flag works correctly', () {
      final now = DateTime.now();
      final base = Task(
        id: 'x',
        ticketId: null,
        taskNumber: null,
        title: 't',
        description: '',
        officeId: null,
        status: 'completed',
        priority: 1,
        queueOrder: null,
        createdAt: now,
        creatorId: null,
        startedAt: null,
        completedAt: now,
        // leave all optional metadata null
      );
      expect(base.hasIncompleteDetails, isTrue);

      final full = Task(
        id: 'x',
        ticketId: null,
        taskNumber: null,
        title: 't',
        description: '',
        officeId: null,
        status: 'completed',
        priority: 1,
        queueOrder: null,
        createdAt: now,
        creatorId: null,
        startedAt: null,
        completedAt: now,
        requestedBy: 'A',
        notedBy: 'B',
        receivedBy: 'C',
        requestType: 'foo',
        requestCategory: 'bar',
        actionTaken: '{}',
      );
      expect(full.hasIncompleteDetails, isFalse);
    });
  });

  // ---------------------------------------------------------------------------
  // TaskActivityLog model tests
  // These cover parsing edge-cases used by the deduplication fingerprint logic.
  // ---------------------------------------------------------------------------
  group('TaskActivityLog.fromMap', () {
    setUp(() {
      AppTime.initialize();
    });

    test('parses basic fields correctly', () {
      final map = {
        'id': 'log-1',
        'task_id': 'tsk-1',
        'actor_id': 'user-1',
        'action_type': 'created',
        'meta': null,
        'created_at': '2026-03-21T10:00:00.000Z',
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.id, 'log-1');
      expect(log.taskId, 'tsk-1');
      expect(log.actorId, 'user-1');
      expect(log.actionType, 'created');
      expect(log.meta, isNull);
    });

    test('parses meta as Map<String,dynamic>', () {
      final map = {
        'id': 'log-2',
        'task_id': 'tsk-1',
        'actor_id': null,
        'action_type': 'assigned',
        'meta': {'user_id': 'u-1', 'role': 'it_staff'},
        'created_at': '2026-03-21T11:00:00.000Z',
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.meta, {'user_id': 'u-1', 'role': 'it_staff'});
      expect(log.actorId, isNull);
    });

    test('parses meta from JSON-encoded string', () {
      final map = {
        'id': 'log-3',
        'task_id': 'tsk-2',
        'actor_id': 'u-2',
        'action_type': 'filled_notes',
        'meta': '{"value":"hello"}',
        'created_at': '2026-03-21T12:00:00.000Z',
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.meta, {'value': 'hello'});
    });

    test('handles non-JSON meta string gracefully (meta is null)', () {
      final map = {
        'id': 'log-4',
        'task_id': 'tsk-3',
        'actor_id': 'u-3',
        'action_type': 'note',
        'meta': 'not-json',
        'created_at': '2026-03-21T13:00:00.000Z',
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.meta, isNull);
    });

    test('defaults action_type to unknown when missing', () {
      final map = {
        'id': 'log-5',
        'task_id': 'tsk-4',
        'actor_id': null,
        'action_type': null,
        'meta': null,
        'created_at': '2026-03-21T14:00:00.000Z',
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.actionType, 'unknown');
    });

    test('id and task_id coerced to string from int', () {
      final map = {
        'id': 42,
        'task_id': 7,
        'actor_id': null,
        'action_type': 'started',
        'meta': null,
        'created_at': '2026-03-21T15:00:00.000Z',
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.id, '42');
      expect(log.taskId, '7');
    });

    test('parses created_at as DateTime directly', () {
      final dt = DateTime.utc(2026, 3, 21, 10, 0, 0);
      final map = {
        'id': 'log-6',
        'task_id': 'tsk-5',
        'actor_id': null,
        'action_type': 'completed',
        'meta': null,
        'created_at': dt,
      };

      final log = TaskActivityLog.fromMap(map);

      expect(log.createdAt.year, 2026);
      expect(log.createdAt.month, 3);
      expect(log.createdAt.day, 21);
    });

    test('two logs with same fields are equal by value (dedup fingerprint)',
        () {
      final base = {
        'id': 'log-7',
        'task_id': 'tsk-6',
        'actor_id': 'u-1',
        'action_type': 'filled_notes',
        'meta': {'value': 'typed text'},
        'created_at': '2026-03-21T10:05:00.000Z',
      };

      final log1 = TaskActivityLog.fromMap(base);
      final log2 = TaskActivityLog.fromMap(base);

      // Verify the fields that form the dedup fingerprint are identical.
      expect(log1.taskId, log2.taskId);
      expect(log1.actorId, log2.actorId);
      expect(log1.actionType, log2.actionType);
      expect(log1.createdAt, log2.createdAt);
    });
  });
}