import 'package:freezed_annotation/freezed_annotation.dart';

part 'container.freezed.dart';

/// Docker container entity.
@freezed
class Container with _$Container {
  const factory Container({
    /// Container ID (short form).
    required String id,

    /// Full container ID.
    required String fullId,

    /// Container name (without leading slash).
    required String name,

    /// Image name with tag.
    required String image,

    /// Current container state.
    required ContainerState state,

    /// Container status string (e.g., "Up 2 hours").
    required String status,

    /// Stack/project this container belongs to.
    String? stackName,

    /// Stack ID if part of a stack.
    String? stackId,

    /// Mapped ports.
    @Default([]) List<PortMapping> ports,

    /// Environment variables (key-value pairs).
    @Default({}) Map<String, String> environment,

    /// Container labels.
    @Default({}) Map<String, String> labels,

    /// Mounted volumes.
    @Default([]) List<VolumeMount> mounts,

    /// Networks the container is connected to.
    @Default([]) List<String> networks,

    /// When the container was created.
    DateTime? createdAt,

    /// When the container was started.
    DateTime? startedAt,

    /// CPU usage percentage (0-100).
    double? cpuPercent,

    /// Memory usage in bytes.
    int? memoryUsage,

    /// Memory limit in bytes.
    int? memoryLimit,
  }) = _Container;

  const Container._();

  /// Whether the container is running.
  bool get isRunning => state == ContainerState.running;

  /// Whether the container can be started.
  bool get canStart =>
      state == ContainerState.exited ||
      state == ContainerState.created ||
      state == ContainerState.paused;

  /// Whether the container can be stopped.
  bool get canStop => state == ContainerState.running;

  /// Whether the container can be restarted.
  bool get canRestart =>
      state == ContainerState.running || state == ContainerState.exited;

  /// Memory usage as a percentage of the limit.
  double? get memoryPercent {
    if (memoryUsage == null || memoryLimit == null || memoryLimit == 0) {
      return null;
    }
    return (memoryUsage! / memoryLimit!) * 100;
  }

  /// Formatted memory usage string.
  String get memoryFormatted {
    if (memoryUsage == null) return '--';
    return _formatBytes(memoryUsage!);
  }

  /// Formatted memory limit string.
  String get memoryLimitFormatted {
    if (memoryLimit == null) return '--';
    return _formatBytes(memoryLimit!);
  }

  String _formatBytes(int bytes) {
    if (bytes < 1024) return '$bytes B';
    if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(1)} KB';
    if (bytes < 1024 * 1024 * 1024) {
      return '${(bytes / (1024 * 1024)).toStringAsFixed(1)} MB';
    }
    return '${(bytes / (1024 * 1024 * 1024)).toStringAsFixed(2)} GB';
  }
}

/// Container state.
enum ContainerState {
  created,
  running,
  paused,
  restarting,
  removing,
  exited,
  dead,
}

/// Port mapping configuration.
@freezed
class PortMapping with _$PortMapping {
  const factory PortMapping({
    /// Host IP (usually 0.0.0.0).
    String? hostIp,

    /// Port on the host.
    int? hostPort,

    /// Port inside the container.
    required int containerPort,

    /// Protocol (tcp/udp).
    @Default('tcp') String protocol,
  }) = _PortMapping;

  const PortMapping._();

  /// Formatted string representation.
  String get formatted {
    if (hostPort == null) return '$containerPort/$protocol';
    final ip = hostIp == '0.0.0.0' ? '' : '$hostIp:';
    return '$ip$hostPort->$containerPort/$protocol';
  }
}

/// Volume mount configuration.
@freezed
class VolumeMount with _$VolumeMount {
  const factory VolumeMount({
    /// Mount type (bind, volume, tmpfs).
    required String type,

    /// Source path or volume name.
    required String source,

    /// Destination path in container.
    required String destination,

    /// Mount mode (rw, ro).
    @Default('rw') String mode,
  }) = _VolumeMount;

  const VolumeMount._();

  /// Whether the mount is read-only.
  bool get isReadOnly => mode == 'ro';
}