import '../../core/exceptions.dart';
import '../api/projects_api.dart';
import '../local/database.dart';
import '../models/project.dart';

/// Projects repository with read-through caching for Tier 2 offline support.
/// Mirrors the pattern in NotesRepository — see that file for full notes.
///
/// `getAll`'s sort/order/status query parameters are server-side filters; the
/// cache stores the unfiltered list as last seen. Offline fallback returns
/// the full cache regardless of the requested filters — close enough for a
/// "view what you had" experience while disconnected.
class ProjectsRepository {
  final ProjectsApi _api;
  final FabledDatabase _db;

  const ProjectsRepository(this._api, this._db);

  Future<List<Project>> getAll({
    String? status,
    String sort = 'updated_at',
    String order = 'desc',
  }) async {
    try {
      final projects =
          await _api.getAll(status: status, sort: sort, order: order);
      // Only refresh the cache on the unfiltered default fetch — otherwise a
      // status=archived call would clobber the active-projects cache.
      if (status == null) {
        await _db.replaceAllProjects(projects);
      } else {
        for (final p in projects) {
          await _db.upsertProject(p);
        }
      }
      return projects;
    } on NetworkException {
      final cached = await _db.getAllProjects();
      if (cached.isEmpty) rethrow;
      if (status != null) {
        return cached.where((p) => p.status == status).toList();
      }
      return cached;
    }
  }

  Future<Project> getOne(int id) async {
    try {
      final project = await _api.getOne(id);
      await _db.upsertProject(project);
      return project;
    } on NetworkException {
      final cached = await _db.getProject(id);
      if (cached == null) rethrow;
      return cached;
    }
  }

  Future<Project> create({
    required String title,
    String? description,
    String? goal,
    String? color,
    String status = 'active',
  }) async {
    final project = await _api.create(
      title: title,
      description: description,
      goal: goal,
      color: color,
      status: status,
    );
    await _db.upsertProject(project);
    return project;
  }

  Future<Project> update(int id, Map<String, dynamic> fields) async {
    final updated = await _api.update(id, fields);
    await _db.upsertProject(updated);
    return updated;
  }

  Future<void> delete(int id) async {
    await _api.delete(id);
    await _db.deleteProject(id);
  }
}