import SwiftUI

struct AttachmentMediaPickerView: View {
    @StateObject private var mediaManager = MediaManager()

    var body: some View {
        ScrollView {
            LazyVGrid(columns: Array(repeating: .init(.flexible()), count: 3)) {
                ForEach(elements) { element in
                    element
                }
            }
            .padding(.horizontal, 8)
        }
        .padding(.vertical, 8)
    }

    private var elements: [GridElement] {
        print("Creating elements")
        var result: [GridElement] = []

        // camera
        if let feed = mediaManager.cameraFeed, mediaManager.cameraAccessLevel == .authorized {
            result.append(GridElement(id: UUID(), type: .cameraFeed, content: feed) {
                print("Go to capture???")
            })
            print("Added camera feed")
        } else if mediaManager.cameraAccessLevel == .restricted {
            result.append(GridElement(id: UUID(), type: .cameraRestricted, content: nil) {
                print("Show alert")
            })
            print("Added camera restricted")
        } else {
            result.append(GridElement(id: UUID(), type: .cameraAskButton, content: nil) {
                mediaManager.openAppSettings()
            })
            print("Added camera ask button")
        }

        // photos
        // if mediaManager.galleryAccessLevel == .restricted {
        //     result.append(GridElement(id: UUID(), type: .photoRestricted, content: nil))
        // } else {
        //     for photo in mediaManager.photos {
        //         result.append(GridElement(id: UUID(), type: .photo, content: photo))
        //     }
        //     if mediaManager.galleryAccessLevel != .authorized {
        //         result.append(GridElement(id: UUID(), type: .photoAskButton, content: nil))
        //     }
        // }

        return result
    }
}

private enum GridElementType {
    case cameraFeed
    case cameraAskButton
    case cameraRestricted
    case photo
    case photoAskButton
    case photoRestricted
}

private struct GridElement: View, Identifiable {
    let id: UUID
    let type: GridElementType
    let content: UIImage?
    let action: () -> Void

    var body: some View {
        switch type {
        case .cameraFeed:
            image
                .resizable()
                .aspectRatio(contentMode: .fill)
                .frame(width: 100, height: 100)
                .clipped()

        case .cameraAskButton:
            Button {
                action()
            } label: {
                RoundedRectangle(cornerRadius: 5)
                    .stroke(Color.Main.backgroundDark, lineWidth: 2)
                    .overlay {
                        Image(systemName: "camera")
                            .foregroundColor(.Material.tortoiseLight300)
                            .font(.system(size: 40))
                    }
                    .frame(height: 100)
                // .resizable()
                // .aspectRatio(contentMode: .fill)
                // .frame(width: 100, height: 100)
                // .clipped()
            }

        case .photo:
            image
                .resizable()
                .aspectRatio(contentMode: .fill)
                .frame(width: 100, height: 100)
                .clipped()

        case .photoAskButton:
            Button {
                action()
            } label: {
                Image(systemName: "photo.badge.plus")
                    .resizable()
                    .aspectRatio(contentMode: .fill)
                    .frame(width: 100, height: 100)
                    .clipped()
            }

        case .photoRestricted, .cameraRestricted:
            Button {
                action()
            } label: {
                Image(systemName: "cross")
                    .resizable()
                    .aspectRatio(contentMode: .fill)
                    .frame(width: 100, height: 100)
                    .clipped()
            }
        }
    }

    private var image: Image {
        guard let content = content else {
            return Image(systemName: "questionmark.square.dashed")
        }
        return Image(uiImage: content)
    }
}

struct AttachmentMediaPickerView_Previews: PreviewProvider {
    static var previews: some View {
        AttachmentMediaPickerView()
    }
}