import Foundation
import SwiftUI

struct MessagesView: View {
    @EnvironmentObject private var model: AppModel

    var body: some View {
        ScrollView {
            LazyVStack(alignment: .leading, spacing: 12) {
                Text(model.text("Wiadomości", "Messages")).font(.largeTitle.bold())
                Text(model.text("Najnowsze wiadomości są wyświetlane na górze.", "The newest messages appear first."))
                    .foregroundStyle(.secondary)
                    .padding(.bottom, 4)
                if model.messages.isEmpty {
                    VStack(spacing: 12) {
                        Image(systemName: "sparkles").font(.largeTitle).foregroundStyle(KTheme.orange)
                        Text(model.text("Nie masz jeszcze żadnych wiadomości.", "You do not have any messages yet."))
                            .multilineTextAlignment(.center)
                    }
                    .frame(maxWidth: .infinity)
                    .kasztelanPanel()
                } else {
                    ForEach(model.messages) { message in
                        messageCard(message)
                    }
                }
            }
            .padding(20)
        }
        .background(AmbientBackground())
        .toolbar { AppToolbar() }
        .refreshable { await model.refresh() }
        .task { await model.refresh() }
    }

    private func messageCard(_ message: KasztelanMessage) -> some View {
        VStack(alignment: .leading, spacing: 10) {
            HStack(alignment: .top) {
                Circle().fill(KTheme.orange).frame(width: 9, height: 9).padding(.top, 6)
                VStack(alignment: .leading, spacing: 3) {
                    Text(message.title.isEmpty ? "Kasztelan" : message.title).font(.headline)
                    Text(messageDate(message.sentAt)).font(.caption).foregroundStyle(.secondary)
                }
                Spacer()
                Button(role: .destructive) { model.deleteMessage(id: message.id) } label: {
                    Image(systemName: "xmark.circle.fill").foregroundStyle(.secondary)
                }
                .accessibilityLabel(model.text("Usuń wiadomość", "Delete message"))
            }
            Text(linkedMessage(message.text))
                .tint(KTheme.orange)
                .fixedSize(horizontal: false, vertical: true)
                .textSelection(.enabled)
        }
        .kasztelanPanel()
    }

    private func messageDate(_ seconds: Int) -> String {
        guard seconds > 0 else { return model.text("Teraz", "Now") }
        let formatter = DateFormatter()
        formatter.dateFormat = model.language == .pl ? "dd.MM.yyyy HH:mm" : "dd/MM/yyyy HH:mm"
        return formatter.string(from: Date(timeIntervalSince1970: TimeInterval(seconds)))
    }

    private func linkedMessage(_ value: String) -> AttributedString {
        let result = NSMutableAttributedString(string: value)
        guard let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue) else {
            return AttributedString(value)
        }
        let fullRange = NSRange(value.startIndex..<value.endIndex, in: value)
        detector.enumerateMatches(in: value, options: [], range: fullRange) { match, _, _ in
            guard let match, let url = match.url,
                  let scheme = url.scheme?.lowercased(),
                  scheme == "http" || scheme == "https" else { return }
            result.addAttribute(.link, value: url, range: match.range)
        }
        return AttributedString(result)
    }
}