import SwiftUI

#if os(iOS)
  import UIKit
#else
  import AppKit
#endif

@MainActor public struct MeetingShareButton: View {
  @ObservedObject private var call: Call
  @State private var showing = false

  public init(call: Call) { self.call = call }

  public var body: some View {
    if call.standing == "member" {
      Button("Share", glyph: "square.and.arrow.up") { showing = true }
        .accessibilityLabel("Share meeting link")
        .sheet(isPresented: $showing) {
          MeetingInvitationView(call: call, close: { showing = false })
            .task { await call.loadInvitation() }
        }
    }
  }
}

@MainActor public struct MeetingInvitationView: View {
  @ObservedObject private var call: Call
  private let close: () -> Void
  @State private var copied = false

  public init(call: Call, close: @escaping () -> Void) {
    self.call = call
    self.close = close
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 20) {
      Text("Share meeting").font(.title2.bold())
      Text("Send this invitation to someone you want to join. Guests will wait to be let in.")
      if call.loadingInvitation {
        ProgressView("Getting invitation…")
      } else if let url = call.invitationURL {
        Text(url.absoluteString).font(.callout).textSelection(.enabled)
        HStack {
          ShareLink(item: url) { Text("Share…") }
          Button(copied ? "Copied" : "Copy link") {
            #if os(iOS)
              UIPasteboard.general.url = url
              copied = true
            #else
              NSPasteboard.general.clearContents()
              copied = NSPasteboard.general.setString(url.absoluteString, forType: .string)
            #endif
          }
        }.buttonStyle(.bordered)
      } else {
        Text(call.invitationError).foregroundStyle(.secondary)
        Button("Try again") { Task { await call.loadInvitation() } }
      }
      Button("Done", action: close)
    }.padding(24).frame(minWidth: 280, idealWidth: 380, maxWidth: 440)
  }
}