import SwiftUI

/// Brand-gepflegtes Eingabefeld für Email/Name/Token. SecureField-
/// Variante darunter (`ManaSecureField`).
///
/// Settings für Email-Input (Keyboard-Type, no autocap/autocorrect)
/// können via `.manaEmailField()`-Modifier convenience gesetzt werden.
public struct ManaTextField: View {
    @Environment(\.manaBrand) private var brand
    private let placeholder: String
    @Binding private var text: String

    public init(_ placeholder: String, text: Binding<String>) {
        self.placeholder = placeholder
        _text = text
    }

    public var body: some View {
        TextField(placeholder, text: $text)
            .padding(.vertical, 12)
            .padding(.horizontal, 16)
            .background(brand.surface, in: RoundedRectangle(cornerRadius: 10))
            .overlay(
                RoundedRectangle(cornerRadius: 10)
                    .stroke(brand.border, lineWidth: 0.5)
            )
            .foregroundStyle(brand.foreground)
    }
}

/// Passwort-Feld. Gleiche Optik wie ``ManaTextField``, aber maskiert.
public struct ManaSecureField: View {
    @Environment(\.manaBrand) private var brand
    private let placeholder: String
    @Binding private var text: String
    private let textContentType: TextContentType

    /// - Parameter textContentType: `.password` für Login-Eingabe,
    ///   `.newPassword` für Sign-Up oder Reset (löst iOS-Passwort-
    ///   Vorschlag-Sheet aus).
    public init(
        _ placeholder: String,
        text: Binding<String>,
        textContentType: TextContentType = .password
    ) {
        self.placeholder = placeholder
        _text = text
        self.textContentType = textContentType
    }

    public var body: some View {
        SecureField(placeholder, text: $text)
            #if os(iOS)
            .textContentType(uiTextContentType)
            #elseif os(macOS)
            .textContentType(nsTextContentType)
            #endif
            .padding(.vertical, 12)
            .padding(.horizontal, 16)
            .background(brand.surface, in: RoundedRectangle(cornerRadius: 10))
            .overlay(
                RoundedRectangle(cornerRadius: 10)
                    .stroke(brand.border, lineWidth: 0.5)
            )
            .foregroundStyle(brand.foreground)
    }

    public enum TextContentType: Sendable {
        case password
        case newPassword
    }

    #if os(iOS)
        private var uiTextContentType: UITextContentType {
            switch textContentType {
            case .password: .password
            case .newPassword: .newPassword
            }
        }
    #elseif os(macOS)
        private var nsTextContentType: NSTextContentType {
            switch textContentType {
            case .password: .password
            case .newPassword: .newPassword
            }
        }
    #endif
}

public extension View {
    /// Convenience-Modifier für Email-Felder: kein Autocaps, kein
    /// Autocorrect, Email-Keyboard auf iOS, Email-textContentType.
    func manaEmailField() -> some View {
        modifier(EmailFieldModifier())
    }
}

private struct EmailFieldModifier: ViewModifier {
    func body(content: Content) -> some View {
        content
            .textContentType(.emailAddress)
            .autocorrectionDisabled()
        #if os(iOS)
            .keyboardType(.emailAddress)
            .textInputAutocapitalization(.never)
        #endif
    }
}