import ActivityKit
import Compression
import Foundation

public enum ContentStateParsingError: Error {
  case invalidJsonString
  case jsonDeserializationFailed(Error)
  case invalidRootType
  case componentsParsingFailed(Error)
  case regionParsingFailed(VoltraRegion, Error)
}

public struct VoltraAttributes: ActivityAttributes {
  public struct ContentState: Codable, Hashable {
    public let uiJsonData: String

    /// Parsed payload (computed once, cached)
    public let payload: VoltraLiveActivityPayload

    private enum CodingKeys: String, CodingKey {
      case uiJsonData
    }

    /// Initialize with compressed JSON data
    public init(uiJsonData: String) throws {
      self.uiJsonData = uiJsonData

      // Decompress and parse once
      let decompressedJson = try BrotliCompression.decompress(base64String: uiJsonData)
      payload = try VoltraLiveActivityPayload(jsonString: decompressedJson)
    }

    // MARK: - Convenience Accessors

    public var regions: [VoltraRegion: [VoltraNode]] {
      payload.regions
    }

    public var keylineTint: String? {
      payload.keylineTint
    }

    public var activityBackgroundTint: String? {
      payload.activityBackgroundTint
    }

    // MARK: - Codable

    public init(from decoder: Decoder) throws {
      let container = try decoder.container(keyedBy: CodingKeys.self)
      let compressedJson = try container.decode(String.self, forKey: .uiJsonData)
      try self.init(uiJsonData: compressedJson)
    }
  }

  var name: String
  var deepLinkUrl: String?
}