import SwiftUI

/// Großer Primary-Button für Auth-Aktionen ("Anmelden", "Registrieren",
/// "Passwort setzen"). Brand-getöntes Background, dunkler Text,
/// integrierter ProgressView wenn `isLoading == true`.
public struct ManaPrimaryButton: View {
    @Environment(\.manaBrand) private var brand
    private let title: String
    private let role: ButtonRole?
    private let isLoading: Bool
    private let isEnabled: Bool
    private let action: () -> Void

    /// - Parameters:
    ///   - title: Label des Buttons.
    ///   - role: Wenn `.destructive`, wird Brand-Error statt Brand-Primary
    ///     genutzt (z.B. für `ManaDeleteAccountView`). Default `nil`.
    ///   - isLoading: Zeigt ProgressView statt Text. Button bleibt disabled.
    ///   - isEnabled: Zusätzliches Disable-Flag (z.B. leere Felder).
    ///   - action: Callback bei Tap.
    public init(
        _ title: String,
        role: ButtonRole? = nil,
        isLoading: Bool = false,
        isEnabled: Bool = true,
        action: @escaping () -> Void
    ) {
        self.title = title
        self.role = role
        self.isLoading = isLoading
        self.isEnabled = isEnabled
        self.action = action
    }

    public var body: some View {
        Button(role: role, action: action) {
            HStack(spacing: 8) {
                if isLoading {
                    ProgressView()
                        .controlSize(.small)
                        .tint(brand.primaryForeground)
                }
                Text(title)
                    .fontWeight(.semibold)
            }
            .frame(maxWidth: .infinity)
            .padding(.vertical, 14)
            .background(backgroundColor, in: RoundedRectangle(cornerRadius: 10))
            .foregroundStyle(brand.primaryForeground)
        }
        .buttonStyle(.plain)
        .disabled(isLoading || !isEnabled)
        .opacity((isLoading || !isEnabled) ? 0.6 : 1.0)
    }

    private var backgroundColor: Color {
        role == .destructive ? brand.error : brand.primary
    }
}