//
// 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 Compound
import SFSafeSymbols
import SwiftUI

struct SettingsScreen: View {
    @ObservedObject var context: SettingsScreenViewModel.Context
    
    private var shouldHideManageAccountSection: Bool {
        context.viewState.accountProfileURL == nil &&
            context.viewState.accountSessionsListURL == nil &&
            !context.viewState.showBlockedUsers
    }
    
    var body: some View {
        Form {
            userSection
            
            manageMyAppSection
            
            if !shouldHideManageAccountSection {
                manageAccountSection
            }
            
            generalSection
        }
        .compoundList()
        .navigationTitle(L10n.commonSettings)
        .navigationBarTitleDisplayMode(.inline)
        .toolbar { toolbar }
    }
    
    private var userSection: some View {
        Section {
            ListRow(kind: .custom {
                Button {
                    context.send(viewAction: .userDetails)
                } label: {
                    HStack(spacing: 12) {
                        LoadableAvatarImage(url: context.viewState.userAvatarURL,
                                            name: context.viewState.userDisplayName,
                                            contentID: context.viewState.userID,
                                            avatarSize: .user(on: .settings),
                                            imageProvider: context.imageProvider)
                            .accessibilityHidden(true)
                        
                        VStack(alignment: .leading, spacing: 2) {
                            Text(context.viewState.userDisplayName ?? "")
                                .font(.compound.headingMD)
                                .foregroundColor(.compound.textPrimary)
                            Text(context.viewState.userID)
                                .font(.compound.bodySM)
                                .foregroundColor(.compound.textSecondary)
                        }
                        
                        Spacer()
                        
                        ListRowAccessory.navigationLink
                    }
                    .padding(.horizontal, ListRowPadding.horizontal)
                    .padding(.vertical, 8)
                }
            })
        }
    }
    
    private var manageMyAppSection: some View {
        Section {
            ListRow(label: .default(title: L10n.screenNotificationSettingsTitle,
                                    icon: \.notifications),
                    kind: .navigationLink {
                        context.send(viewAction: .notifications)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.notifications)
            
            ListRow(label: .default(title: L10n.commonScreenLock,
                                    icon: \.lock),
                    kind: .navigationLink {
                        context.send(viewAction: .appLock)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.screenLock)
            
            switch context.viewState.securitySectionMode {
            case .secureBackup:
                ListRow(label: .default(title: L10n.commonChatBackup,
                                        icon: \.key),
                        details: context.viewState.showSecuritySectionBadge ? .icon(securitySectionBadge) : nil,
                        kind: .navigationLink { context.send(viewAction: .secureBackup) })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.secureBackup)
            default:
                EmptyView()
            }
        }
    }
    
    private var manageAccountSection: some View {
        Section {
            if let url = context.viewState.accountProfileURL {
                ListRow(label: .default(title: L10n.actionManageAccount,
                                        icon: \.userProfile),
                        kind: .button {
                            context.send(viewAction: .manageAccount(url: url))
                        })
                        .accessibilityIdentifier(A11yIdentifiers.settingsScreen.account)
            }
            
            if let url = context.viewState.accountSessionsListURL {
                ListRow(label: .default(title: L10n.actionManageDevices,
                                        icon: \.devices),
                        kind: .button {
                            context.send(viewAction: .manageAccount(url: url))
                        })
            }
            
            if context.viewState.showBlockedUsers {
                ListRow(label: .default(title: L10n.commonBlockedUsers,
                                        icon: \.block),
                        kind: .navigationLink {
                            context.send(viewAction: .blockedUsers)
                        })
                        .accessibilityIdentifier(A11yIdentifiers.settingsScreen.blockedUsers)
            }
        }
    }
    
    private var generalSection: some View {
        Section {
            ListRow(label: .default(title: L10n.commonAbout,
                                    icon: \.info),
                    kind: .navigationLink {
                        context.send(viewAction: .about)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.about)
            
            ListRow(label: .default(title: L10n.commonReportAProblem,
                                    icon: \.chatProblem),
                    kind: .navigationLink {
                        context.send(viewAction: .reportBug)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.reportBug)
            
            ListRow(label: .default(title: L10n.commonAnalytics,
                                    icon: \.chart),
                    kind: .navigationLink {
                        context.send(viewAction: .analytics)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.analytics)
            
            ListRow(label: .default(title: L10n.commonAdvancedSettings,
                                    icon: \.settings),
                    kind: .navigationLink {
                        context.send(viewAction: .advancedSettings)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.advancedSettings)
            
            if context.viewState.showDeveloperOptions {
                ListRow(label: .default(title: L10n.commonDeveloperOptions,
                                        icon: \.code),
                        kind: .navigationLink {
                            context.send(viewAction: .developerOptions)
                        })
                        .accessibilityIdentifier(A11yIdentifiers.settingsScreen.developerOptions)
            }
            
            ListRow(label: .action(title: L10n.screenSignoutPreferenceItem,
                                   icon: \.signOut,
                                   role: .destructive),
                    kind: .button {
                        context.send(viewAction: .logout)
                    })
                    .accessibilityIdentifier(A11yIdentifiers.settingsScreen.logout)
        } footer: {
            VStack(spacing: 0) {
                versionText
                    .frame(maxWidth: .infinity)
                
                if let deviceID = context.viewState.deviceID {
                    Text(deviceID)
                }
            }
            .compoundListSectionFooter()
            .textSelection(.enabled)
            .padding(.top, 24)
            .onTapGesture(count: 7) {
                context.send(viewAction: .enableDeveloperOptions)
            }
        }
    }
    
    private var versionText: Text {
        Text(L10n.settingsVersionNumber(InfoPlistReader.main.bundleShortVersionString, InfoPlistReader.main.bundleVersion))
    }
    
    private var toolbar: some ToolbarContent {
        ToolbarItem(placement: .confirmationAction) {
            Button(L10n.actionDone) { context.send(viewAction: .close) }
                .accessibilityIdentifier(A11yIdentifiers.settingsScreen.done)
        }
    }
    
    @ViewBuilder
    private var securitySectionBadge: some View {
        if context.viewState.showSecuritySectionBadge {
            BadgeView(size: 10)
        }
    }
}

// MARK: - Previews

struct SettingsScreen_Previews: PreviewProvider, TestablePreview {
    static let viewModel = {
        let userSession = UserSessionMock(.init(clientProxy: ClientProxyMock(.init(userID: "@userid:example.com",
                                                                                   deviceID: "AAAAAAAAAAA"))))
        return SettingsScreenViewModel(userSession: userSession)
    }()
    
    static var previews: some View {
        NavigationStack {
            SettingsScreen(context: viewModel.context)
                .snapshot(delay: 1.0)
        }
    }
}