//
// Copyright 2022 New Vector Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import SwiftUI

struct UserSessionListItem: View {
    private enum LayoutConstants {
        static let horizontalPadding: CGFloat = 15
        static let verticalPadding: CGFloat = 16
        static let avatarWidth: CGFloat = 40
        static let avatarRightMargin: CGFloat = 18
    }
    
    @Environment(\.theme) private var theme: ThemeSwiftUI
    
    let viewData: UserSessionListItemViewData
    
    var isEditModeEnabled = false
    
    var onBackgroundTap: ((String) -> Void)?
    var onBackgroundLongPress: ((String) -> Void)?
    
    var body: some View {
        Button { } label: {
            ZStack {
                if viewData.isSelected {
                    RoundedRectangle(cornerRadius: 8, style: .continuous)
                        .fill(theme.colors.system)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .padding(4)
                }
                VStack(alignment: .leading, spacing: LayoutConstants.verticalPadding) {
                    HStack(spacing: LayoutConstants.avatarRightMargin) {
                        if isEditModeEnabled {
                            Image(viewData.isSelected ? Asset.Images.userSessionListItemSelected.name : Asset.Images.userSessionListItemNotSelected.name)
                        }
                        DeviceAvatarView(viewData: viewData.deviceAvatarViewData, isSelected: viewData.isSelected)
                        VStack(alignment: .leading, spacing: 2) {
                            Text(viewData.sessionName)
                                .font(theme.fonts.bodySB)
                                .foregroundColor(theme.colors.primaryContent)
                                .multilineTextAlignment(.leading)
                            HStack {
                                if let sessionDetailsIcon = viewData.sessionDetailsIcon {
                                    Image(sessionDetailsIcon)
                                        .padding(.leading, 2)
                                }
                                Text(viewData.sessionDetails)
                                    .font(theme.fonts.caption1)
                                    .foregroundColor(viewData.highlightSessionDetails ? theme.colors.alert : theme.colors.secondaryContent)
                                    .multilineTextAlignment(.leading)
                            }
                        }
                    }
                    .frame(maxWidth: .infinity, alignment: .leading)
                    .padding(.horizontal, LayoutConstants.horizontalPadding)
                    
                    // Separator
                    // Note: Separator leading is matching the text leading, we could use alignment guide in the future
                    SeparatorLine()
                        .padding(.leading, LayoutConstants.horizontalPadding + LayoutConstants.avatarRightMargin + LayoutConstants.avatarWidth)
                }
                .padding(.top, LayoutConstants.verticalPadding)
            }.onTapGesture {
                onBackgroundTap?(viewData.sessionId)
            }
            .onLongPressGesture {
                onBackgroundLongPress?(viewData.sessionId)
            }
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .accessibilityIdentifier("UserSessionListItem_\(viewData.sessionId)")
    }
}

struct UserSessionListPreview: View {
    let userSessionsOverviewService: UserSessionsOverviewServiceProtocol = MockUserSessionsOverviewService()
    var isEditModeEnabled = false
    
    var body: some View {
        VStack(alignment: .leading, spacing: 0) {
            ForEach(userSessionsOverviewService.otherSessions) { userSessionInfo in
                let viewData = UserSessionListItemViewDataFactory().create(from: userSessionInfo)
                UserSessionListItem(viewData: viewData, isEditModeEnabled: isEditModeEnabled, onBackgroundTap: { _ in
                })
            }
        }
    }
}

struct UserSessionListItem_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            UserSessionListPreview().theme(.light).preferredColorScheme(.light)
            UserSessionListPreview().theme(.dark).preferredColorScheme(.dark)
            UserSessionListPreview(isEditModeEnabled: true).theme(.light).preferredColorScheme(.light)
            UserSessionListPreview(isEditModeEnabled: true).theme(.dark).preferredColorScheme(.dark)
        }
    }
}