import SwiftUI
import UIKit

struct SocialShareSheet: View {
    let imageURL: URL
    @State private var showSystemShare = false
    @State private var showCopiedToast = false
    @Environment(\.dismiss) private var dismiss

    private var image: UIImage? { UIImage(contentsOfFile: imageURL.path) }

    var body: some View {
        NavigationStack {
            VStack(spacing: 24) {
                if let img = image {
                    Image(uiImage: img)
                        .resizable()
                        .scaledToFit()
                        .frame(maxHeight: 220)
                        .clipShape(RoundedRectangle(cornerRadius: 14))
                        .shadow(color: .black.opacity(0.12), radius: 14, x: 0, y: 6)
                }

                VStack(spacing: 10) {
                    if canOpenInstagram {
                        shareOptionRow(
                            title: "Instagram Stories",
                            subtitle: String(localized: "share_instagram_subtitle"),
                            icon: "camera.fill",
                            color: Color(red: 0.80, green: 0.18, blue: 0.75),
                            action: shareToInstagramStories
                        )
                    }

                    shareOptionRow(
                        title: String(localized: "share_copy_image"),
                        subtitle: String(localized: "share_copy_subtitle"),
                        icon: "doc.on.doc.fill",
                        color: .mealMoodCoral,
                        action: copyImage
                    )

                    shareOptionRow(
                        title: String(localized: "share_more_options"),
                        subtitle: String(localized: "share_more_subtitle"),
                        icon: "square.and.arrow.up.fill",
                        color: Color(hex: "#4A6CF7"),
                        action: { showSystemShare = true }
                    )
                }

                Spacer()
            }
            .padding(20)
            .navigationTitle(String(localized: "share_export_sheet_title"))
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button(String(localized: "dish_cancel")) { dismiss() }
                }
            }
        }
        .toast(isShowing: $showCopiedToast, message: String(localized: "share_copied"))
        .sheet(isPresented: $showSystemShare) {
            // Ship the link as text alongside the image so the viral loop isn't
            // limited to the QR baked into the rendered export.
            SystemShareSheet(activityItems: [imageURL, String(localized: "share_link_text")])
        }
    }

    // MARK: - Row view

    private func shareOptionRow(title: String, subtitle: String, icon: String, color: Color, action: @escaping () -> Void) -> some View {
        Button(action: action) {
            HStack(spacing: 14) {
                Image(systemName: icon)
                    .font(.system(size: 18, weight: .semibold))
                    .foregroundColor(.white)
                    .frame(width: 44, height: 44)
                    .background(color)
                    .clipShape(RoundedRectangle(cornerRadius: 12))

                VStack(alignment: .leading, spacing: 2) {
                    Text(title)
                        .font(.mealMoodBodyBold)
                        .foregroundColor(.mealMoodTextPrimary)
                    Text(subtitle)
                        .font(.mealMoodCaption)
                        .foregroundColor(.mealMoodTextSecondary)
                }

                Spacer()

                Image(systemName: "chevron.right")
                    .font(.system(size: 12, weight: .semibold))
                    .foregroundColor(.mealMoodTextSecondary)
            }
            .padding(12)
            .background(Color.mealMoodSurface)
            .clipShape(RoundedRectangle(cornerRadius: 14))
        }
        .buttonStyle(.plain)
    }

    // MARK: - Actions

    private var canOpenInstagram: Bool {
        guard let url = URL(string: "instagram-stories://share") else { return false }
        return UIApplication.shared.canOpenURL(url)
    }

    private func shareToInstagramStories() {
        guard let img = image,
              let data = img.pngData(),
              let url = URL(string: "instagram-stories://share?source_application=com.alexandrevazquez.mealmood")
        else { return }
        UIPasteboard.general.setData(data, forPasteboardType: "com.instagram.sharedSticker.backgroundImage")
        UIApplication.shared.open(url)
        dismiss()
    }

    private func copyImage() {
        guard let img = image else { return }
        UIPasteboard.general.image = img
        showCopiedToast = true
        HapticManager.shared.notification(type: .success)
    }
}

// MARK: - System share wrapper (private)

private struct SystemShareSheet: UIViewControllerRepresentable {
    let activityItems: [Any]

    func makeUIViewController(context: Context) -> UIActivityViewController {
        UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
    }

    func updateUIViewController(_ uiViewController: UIActivityViewController, context: Context) {}
}