import Models
import Nuke
import NukeUI
import Shimmer
import SwiftUI

@MainActor
public struct AvatarView: View {
  @Environment(Theme.self) private var theme

  public let avatar: URL?
  public let config: FrameConfig

  public var body: some View {
    if let avatar {
      AvatarImage(avatar, config: adaptiveConfig)
        .frame(width: config.width, height: config.height)
    } else {
      AvatarPlaceHolder(config: adaptiveConfig)
    }
  }

  private var adaptiveConfig: FrameConfig {
    let cornerRadius: CGFloat = if config == .badge || theme.avatarShape == .circle {
      config.width / 2
    } else {
      config.cornerRadius
    }
    return FrameConfig(width: config.width, height: config.height, cornerRadius: cornerRadius)
  }

  public init(_ avatar: URL? = nil, config: FrameConfig = .status) {
    self.avatar = avatar
    self.config = config
  }

  public struct FrameConfig: Equatable {
    public let size: CGSize
    public var width: CGFloat { size.width }
    public var height: CGFloat { size.height }
    let cornerRadius: CGFloat

    init(width: CGFloat, height: CGFloat, cornerRadius: CGFloat = 4) {
      size = CGSize(width: width, height: height)
      self.cornerRadius = cornerRadius
    }

    public static let account = FrameConfig(width: 80, height: 80)
    #if targetEnvironment(macCatalyst)
      public static let status = FrameConfig(width: 48, height: 48)
    #else
      public static let status = FrameConfig(width: 40, height: 40)
    #endif
    public static let embed = FrameConfig(width: 34, height: 34)
    public static let badge = FrameConfig(width: 28, height: 28, cornerRadius: 14)
    public static let list = FrameConfig(width: 20, height: 20, cornerRadius: 10)
    public static let boost = FrameConfig(width: 12, height: 12, cornerRadius: 6)
  }
}

struct AvatarView_Previews: PreviewProvider {
  static var previews: some View {
    PreviewWrapper()
      .padding()
      .previewLayout(.sizeThatFits)
  }
}

struct PreviewWrapper: View {
  @State private var isCircleAvatar = false

  var body: some View {
    VStack(alignment: .leading) {
      AvatarView(Self.account.avatar)
        .environment(Theme.shared)
      Toggle("Avatar Shape", isOn: $isCircleAvatar)
    }
    .onChange(of: isCircleAvatar) {
      Theme.shared.avatarShape = isCircleAvatar ? .circle : .rounded
    }
    .onAppear {
      Theme.shared.avatarShape = isCircleAvatar ? .circle : .rounded
    }
  }

  private static let account = Account(
    id: UUID().uuidString,
    username: "@clattner_llvm",
    displayName: "Chris Lattner",
    avatar: URL(string: "https://pbs.twimg.com/profile_images/1484209565788897285/1n6Viahb_400x400.jpg")!,
    header: URL(string: "https://pbs.twimg.com/profile_banners/2543588034/1656822255/1500x500")!,
    acct: "clattner_llvm@example.com",
    note: .init(stringValue: "Building beautiful things @Modular_AI 🔥, lifting the world of production AI/ML software into a new phase of innovation.  We’re hiring! 🚀🧠"),
    createdAt: ServerDate(),
    followersCount: 77100,
    followingCount: 167,
    statusesCount: 123,
    lastStatusAt: nil,
    fields: [],
    locked: false,
    emojis: [],
    url: URL(string: "https://nondot.org/sabre/")!,
    source: nil,
    bot: false,
    discoverable: true
  )
}

struct AvatarImage: View {
  @Environment(\.redactionReasons) private var reasons

  public let avatar: URL
  public let config: AvatarView.FrameConfig

  var body: some View {
    if reasons == .placeholder {
      AvatarPlaceHolder(config: config)
    } else {
      LazyImage(request: ImageRequest(url: avatar, processors: [.resize(size: config.size)])
      ) { state in
        if let image = state.image {
          image
            .resizable()
            .scaledToFit()
            .clipShape(RoundedRectangle(cornerRadius: config.cornerRadius))
            .overlay(
              RoundedRectangle(cornerRadius: config.cornerRadius)
                .stroke(.primary.opacity(0.25), lineWidth: 1)
            )
        }
      }
    }
  }

  init(_ avatar: URL, config: AvatarView.FrameConfig) {
    self.avatar = avatar
    self.config = config
  }
}

struct AvatarPlaceHolder: View {
  let config: AvatarView.FrameConfig

  var body: some View {
    RoundedRectangle(cornerRadius: config.cornerRadius)
      .fill(.gray)
      .frame(width: config.width, height: config.height)
  }
}
