import 'package:dio/dio.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:tatlock_ui/core/api/api_client.dart';
import 'package:tatlock_ui/features/control_room/containers/data/datasources/containers_datasource.dart';
import 'package:tatlock_ui/features/control_room/containers/domain/entities/container.dart';
import 'package:tatlock_ui/features/control_room/stacks/domain/entities/stack.dart';

part 'stacks_datasource.g.dart';

/// Data source for stack operations.
///
/// Stacks are derived from container labels (Docker Compose convention).
/// The Core API provides endpoints for stack YAML and environment variables.
class StacksDatasource {
  StacksDatasource(this._dio, this._containersDatasource);

  final Dio _dio;
  final ContainersDatasource _containersDatasource;

  /// Gets all stacks by aggregating container data.
  Future<List<Stack>> getStacks() async {
    final containers = await _containersDatasource.getContainers();
    final containerEntities = containers.map((c) => c.toEntity()).toList();

    // Group containers by stack name
    final stackMap = <String, List<Container>>{};

    for (final container in containerEntities) {
      final stackName = container.stackName;
      if (stackName != null) {
        stackMap.putIfAbsent(stackName, () => []).add(container);
      }
    }

    // Convert to Stack entities
    return stackMap.entries.map((entry) {
      final name = entry.key;
      final stackContainers = entry.value;
      final runningCount = stackContainers.where((c) => c.isRunning).length;

      return Stack(
        id: name, // Use name as ID for compose stacks
        name: name,
        type: StackType.compose,
        status: runningCount == stackContainers.length
            ? StackStatus.active
            : runningCount > 0
                ? StackStatus.active
                : StackStatus.inactive,
        containerCount: stackContainers.length,
        runningCount: runningCount,
      );
    }).toList()
      ..sort((a, b) => a.name.compareTo(b.name));
  }

  /// Gets a single stack by ID.
  Future<Stack> getStack(String id) async {
    final stacks = await getStacks();
    return stacks.firstWhere(
      (s) => s.id == id,
      orElse: () => throw Exception('Stack not found: $id'),
    );
  }

  /// Performs an action on all containers in a stack.
  Future<void> stackAction(String stackId, String action) async {
    final containers = await _containersDatasource.getContainers();
    final stackContainers = containers
        .map((c) => c.toEntity())
        .where((c) => c.stackId == stackId)
        .toList();

    for (final container in stackContainers) {
      await _containersDatasource.containerAction(container.fullId, action);
    }
  }

  /// Gets the compose YAML for a stack.
  Future<String> getStackYaml(String stackId) async {
    final response = await _dio.get<String>(
      '/infrastructure/stacks/$stackId/compose',
    );
    return response.data ?? '';
  }

  /// Updates the compose YAML for a stack.
  Future<void> updateStackYaml(String stackId, String yaml) async {
    await _dio.put<void>(
      '/infrastructure/stacks/$stackId/compose',
      data: yaml,
      options: Options(contentType: 'text/yaml'),
    );
  }

  /// Gets the environment variables for a stack.
  Future<Map<String, String>> getStackEnvVars(String stackId) async {
    final response = await _dio.get<Map<String, dynamic>>(
      '/infrastructure/stacks/$stackId/env',
    );
    return response.data?.map((k, v) => MapEntry(k, v.toString())) ?? {};
  }

  /// Updates the environment variables for a stack.
  Future<void> updateStackEnvVars(
    String stackId,
    Map<String, String> envVars,
  ) async {
    await _dio.put<void>(
      '/infrastructure/stacks/$stackId/env',
      data: envVars,
    );
  }

  /// Deploys/redeploys a stack with current configuration.
  Future<void> deployStack(String stackId) async {
    await _dio.post<void>('/infrastructure/stacks/$stackId/deploy');
  }

  /// Rebuilds a stack (pulls fresh images and recreates containers).
  Future<void> rebuildStack(String stackId) async {
    await _dio.post<void>('/infrastructure/stacks/$stackId/rebuild');
  }
}

/// Provides the stacks datasource.
@riverpod
StacksDatasource stacksDatasource(StacksDatasourceRef ref) {
  final dio = ref.watch(coreApiClientProvider);
  final containersDatasource = ref.watch(containersDatasourceProvider);
  return StacksDatasource(dio, containersDatasource);
}