import SwiftUI

struct SettingsView: View {
    @Environment(AuthSession.self) private var auth

    var body: some View {
        NavigationStack {
            Form {
                Section {
                    HStack(spacing: 14) {
                        avatarView
                            .frame(width: 60, height: 60)
                            .clipShape(Circle())
                        VStack(alignment: .leading, spacing: 2) {
                            Text(displayName)
                                .font(.headline)
                            if let email = auth.profile?.email {
                                Text(email)
                                    .font(.footnote)
                                    .foregroundStyle(.secondary)
                            }
                        }
                    }
                    .padding(.vertical, 4)
                }

                Section("Account") {
                    LabeledContent("Rolle", value: rolleLabel)
                    if auth.profile?.isFounderFlag == true {
                        LabeledContent("Founder", value: founderLabel)
                    }
                    if auth.profile?.isPartnerFlag == true {
                        LabeledContent("Partner", value: "Ja")
                    }
                    if let tier = auth.profile?.subscriptionTier, !tier.isEmpty {
                        LabeledContent("Abo", value: tier.capitalized)
                    }
                    LabeledContent("Premium", value: premiumValue ? "Ja" : "Nein")
                }

                if let wohnort = auth.profile?.wohnort, !wohnort.isEmpty {
                    Section("Ort") {
                        Text(wohnort)
                    }
                }

                Section {
                    Button("Abmelden", role: .destructive) {
                        auth.logout()
                    }
                }

                Section("Über") {
                    Text("Ban Yaro Go ist die native iOS-Ergänzung zur banyaro.app PWA. Phase 1: deine Touren ansehen.")
                        .font(.footnote)
                        .foregroundStyle(.secondary)
                }
            }
            .navigationTitle("Mehr")
            .refreshable { await auth.loadProfile() }
        }
    }

    private var displayName: String {
        auth.profile?.name ?? auth.userName ?? "—"
    }

    private var premiumValue: Bool {
        auth.profile?.isPremium ?? auth.isPremium
    }

    private var rolleLabel: String {
        switch auth.profile?.rolle?.lowercased() {
        case "admin":     return "Admin"
        case "moderator": return "Moderator"
        case nil:         return "—"
        default:          return "Mitglied"
        }
    }

    private var founderLabel: String {
        if let n = auth.profile?.founderNumber { return "#\(n)" }
        return "Ja"
    }

    @ViewBuilder
    private var avatarView: some View {
        if let path = auth.profile?.avatarUrl, !path.isEmpty,
           let url = avatarURL(path) {
            AsyncImage(url: url) { phase in
                switch phase {
                case .success(let img): img.resizable().scaledToFill()
                default: avatarPlaceholder
                }
            }
        } else {
            avatarPlaceholder
        }
    }

    private var avatarPlaceholder: some View {
        ZStack {
            Color.accentColor.opacity(0.2)
            Image(systemName: "person.crop.circle.fill")
                .font(.system(size: 36))
                .foregroundStyle(Color.accentColor)
        }
    }

    private func avatarURL(_ path: String) -> URL? {
        if path.hasPrefix("http") { return URL(string: path) }
        return URL(string: "https://banyaro.app\(path)")
    }
}