//
// Copyright 2025 Element Creations Ltd.
// Copyright 2024-2025 New Vector Ltd.
//
// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
// Please see LICENSE in the repository root for full details.
//

import Compound
import SwiftUI

struct EditRoomAddressListRow: View {
    @Binding var aliasLocalPart: String
    var serverName: String
    /// The error to display, if any. Also associated with the field for VoiceOver.
    var errorDescription: String?
    /// The section's helper text, associated with the field for VoiceOver.
    var footerText: String?
    
    private var fullAddress: String {
        "#\(aliasLocalPart):\(serverName)"
    }
    
    /// Associates the helper text and any error with the field, as they're otherwise
    /// only shown in a separate section footer.
    private var accessibilityHint: String {
        [L10n.a11yEditRoomAddressHint(fullAddress), footerText, errorDescription]
            .compactMap { $0 }
            .joined(separator: "\n")
    }
    
    var body: some View {
        ListRow(kind: .custom {
            HStack(spacing: 0) {
                Text("#")
                    .font(.compound.bodyLG)
                    .foregroundStyle(.compound.textSecondary)
                    .accessibilityHidden(true)
                TextField("", text: $aliasLocalPart)
                    .textInputAutocapitalization(.never)
                    .autocorrectionDisabled()
                    .textContentType(.URL)
                    .tint(.compound.iconAccentTertiary)
                    .font(.compound.bodyLG)
                    .foregroundStyle(.compound.textPrimary)
                    .padding(.horizontal, 8)
                    .accessibilityLabel(L10n.a11yAddress)
                    .accessibilityHint(accessibilityHint)
                Text(":\(serverName)")
                    .font(.compound.bodyLG)
                    .foregroundStyle(.compound.textSecondary)
                    .accessibilityHidden(true)
            }
            .padding(ListRowPadding.textFieldInsets)
            .environment(\.layoutDirection, .leftToRight)
            .errorBackground(errorDescription != nil)
        })
    }
}

private extension View {
    @ViewBuilder
    private var shape: some View {
        if #available(iOS 26, *) {
            Capsule()
                .inset(by: 1)
                .fill(.compound.bgCriticalSubtleHovered)
                .stroke(Color.compound.borderCriticalPrimary)
        } else {
            RoundedRectangle(cornerRadius: 10)
                .inset(by: 1)
                .fill(.compound.bgCriticalSubtleHovered)
                .stroke(Color.compound.borderCriticalPrimary)
        }
    }
    
    func errorBackground(_ shouldDisplay: Bool) -> some View {
        listRowBackground(shouldDisplay ? AnyView(shape) : AnyView(Color.compound.bgCanvasDefaultLevel1))
    }
}

enum EditRoomAddressErrorState {
    case alreadyExists
    case invalidSymbols
}

extension Set<EditRoomAddressErrorState> {
    var errorDescription: String? {
        if contains(.alreadyExists) {
            return L10n.errorRoomAddressAlreadyExists
        } else if contains(.invalidSymbols) {
            return L10n.errorRoomAddressInvalidSymbols
        }
        return nil
    }
}