import AVFoundation
import MobileCoreServices
import Photos
import SwiftUI

struct MediaPickerView: View {
    @Environment(\.router) var router
    @EnvironmentObject var attachments: AttachmentsStore

    @State private var selectedItems: [String] = []

    var body: some View {
        let columns = Array(repeating: GridItem(.flexible(), spacing: 0), count: 3)

        VStack(spacing: 0) {
            // List of media
            ScrollView(showsIndicators: false) {
                LazyVGrid(columns: columns, spacing: 0) {
                    // For camera
                    CameraCellPreview()

                    // For gallery
                    GalleryView(selectedItems: $selectedItems)
                }
            }

            // Send panel
            Rectangle()
                .foregroundColor(.Material.Shape.black)
                .frame(maxWidth: .infinity)
                .frame(height: self.selectedItems.isEmpty ? 0 : 50)
                .overlay {
                    HStack {
                        Text(L10n.Attachment.Send.media)
                            .foregroundColor(.Material.Text.white)
                            .font(.body1)
                        Image(systemName: "arrow.up.circle")
                            .foregroundColor(.Material.Text.white)
                            .font(.body1)
                            .padding(.leading, 8)
                    }
                    .padding()
                }
                .clipped()
                .onTapGesture {
                    let items = attachments.galleryItems.filter { selectedItems.contains($0.id) }
                    attachments.sendMedia(items)
                    router.dismissEnvironment()
                }
        }
    }
}