//
// Copyright 2026 Novaloop AG
//
// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
// Please see LICENSE files in the repository root for full details.
//

import Compound
import SwiftUI

struct HealthChatProfileEditScreen: View {
    @Bindable var context: HealthChatProfileEditScreenViewModel.Context
    
    var body: some View {
        content
            .navigationTitle(L10n.screenEditProfileTitle)
            .navigationBarTitleDisplayMode(.inline)
            .navigationBarBackButtonHidden(context.viewState.canSave)
            .toolbar { toolbar }
            .alert(item: $context.alertInfo)
    }
    
    // MARK: - Private
    
    @ViewBuilder
    private var content: some View {
        if context.viewState.loadFailed {
            failureView
        } else {
            form
        }
    }
    
    private var form: some View {
        Form {
            Section {
                avatar
            }
            
            Section {
                textFieldRow(HealthChatL10n.commonAcademicTitle, text: $context.title)
                textFieldRow(requiredLabel(HealthChatL10n.commonFirstName), text: $context.firstName)
                textFieldRow(requiredLabel(HealthChatL10n.commonLastName), text: $context.lastName)
            } header: {
                Text(HealthChatL10n.screenProfileEditSectionPersonal)
                    .compoundListSectionHeader()
            }
            
            Section {
                textFieldRow(requiredLabel(HealthChatL10n.commonSpecialty), text: $context.specialty)
                textFieldRow(requiredLabel(HealthChatL10n.commonPracticeName), text: $context.practiceName)
                textFieldRow(requiredLabel(HealthChatL10n.commonCity), text: $context.businessCity)
                textFieldRow(HealthChatL10n.commonFurtherInfo, text: $context.furtherInfo, axis: .vertical)
            } header: {
                Text(HealthChatL10n.screenProfileEditSectionProfessional)
                    .compoundListSectionHeader()
            }
            
            Section {
                textFieldRow(HealthChatL10n.commonBusinessEmail, text: $context.businessEmail)
                textFieldRow(HealthChatL10n.commonBusinessTel, text: $context.businessTel)
            } header: {
                Text(HealthChatL10n.screenProfileEditSectionContact)
                    .compoundListSectionHeader()
            }
            
            Section {
                textFieldRow(HealthChatL10n.commonStreet, text: $context.street)
                textFieldRow(HealthChatL10n.commonHouseNumber, text: $context.houseNumber)
                textFieldRow(HealthChatL10n.commonPostalCode, text: $context.postalCode)
                textFieldRow(HealthChatL10n.commonWebsite, text: $context.website)
            } header: {
                Text(HealthChatL10n.screenProfileEditSectionAddress)
                    .compoundListSectionHeader()
            }
        }
        .compoundList()
        .scrollDismissesKeyboard(.immediately)
        .disabled(context.viewState.initialProfile == nil)
    }
    
    private var failureView: some View {
        VStack(spacing: 16) {
            BigIcon(icon: \.error)
            
            Text(L10n.commonSomethingWentWrong)
                .font(.compound.bodyLG)
                .foregroundColor(.compound.textSecondary)
                .multilineTextAlignment(.center)
            
            Button(L10n.actionRetry) {
                context.send(viewAction: .retry)
            }
            .buttonStyle(.compound(.secondary, size: .medium))
            .fixedSize()
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .padding(16)
    }
    
    @ToolbarContentBuilder
    private var toolbar: some ToolbarContent {
        ToolbarItem(placement: .cancellationAction) {
            if context.viewState.canSave {
                Button(L10n.actionCancel) {
                    context.send(viewAction: .cancel)
                }
            }
        }
        ToolbarItem(placement: .confirmationAction) {
            Button(L10n.actionSave) {
                context.send(viewAction: .save)
            }
            .disabled(!context.viewState.canSave)
        }
    }
    
    private var avatar: some View {
        Button {
            context.send(viewAction: .presentMediaSource)
        } label: {
            OverridableAvatarImage(overrideURL: context.viewState.localMedia?.thumbnailURL,
                                   url: context.viewState.selectedAvatarURL,
                                   name: context.viewState.initialProfile?.displayName,
                                   contentID: context.viewState.initialProfile?.userID ?? "",
                                   shape: .circle,
                                   avatarSize: .user(on: .editUserDetails),
                                   mediaProvider: context.mediaProvider)
                .confirmationDialog("", isPresented: $context.showMediaSheet) {
                    mediaActionSheet
                }
        }
        .buttonStyle(EditAvatarButtonStyle())
        .disabled(!context.viewState.canEditAvatar)
        .frame(maxWidth: .infinity, alignment: .center)
        .listRowBackground(Color.clear)
    }
    
    private func textFieldRow(_ label: String, text: Binding<String>, axis: Axis = .horizontal) -> some View {
        ListRow(label: .plain(title: label),
                kind: .textField(text: text, axis: axis))
    }
    
    private func requiredLabel(_ label: String) -> String {
        "\(label) *"
    }
    
    @ViewBuilder
    private var mediaActionSheet: some View {
        Button {
            context.send(viewAction: .displayCameraPicker)
        } label: {
            Text(L10n.actionTakePhoto)
        }
        
        Button {
            context.send(viewAction: .displayMediaPicker)
        } label: {
            Text(L10n.actionChoosePhoto)
        }
        
        Button {
            context.send(viewAction: .displayFilePicker)
        } label: {
            Text(L10n.actionChooseFile)
        }
        
        if context.viewState.showDeleteImageAction {
            Button(role: .destructive) {
                context.send(viewAction: .removeImage)
            } label: {
                Text(L10n.actionRemove)
            }
        }
    }
}

// MARK: - Previews

struct HealthChatProfileEditScreen_Previews: PreviewProvider, TestablePreview {
    static let viewModel = makeViewModel()
    
    static var previews: some View {
        ElementNavigationStack {
            HealthChatProfileEditScreen(context: viewModel.context)
        }
        .snapshotPreferences(expect: viewModel.context.observe(\.viewState.initialProfile).map { $0 != nil })
        .previewDisplayName("Profile")
    }
    
    static func makeViewModel() -> HealthChatProfileEditScreenViewModel {
        let apiService = HealthChatAPIServiceMock()
        let member = try? JSONDecoder().decode(HealthChatMember.self, from: Data("""
        {
            "userId": "@alice:healthchat.ch",
            "displayName": "Dr. Alice Alpha",
            "title": "Dr. med.",
            "firstName": "Alice",
            "lastName": "Alpha",
            "specialty": "Physiotherapie",
            "practiceName": "Praxis Alpha",
            "businessCity": "Zürich",
            "businessEmail": "praxis@example.ch",
            "businessTel": "+41 44 123 45 67",
            "street": "Friedaustrasse",
            "houseNumber": "17",
            "postalCode": "8003",
            "website": "https://example.ch"
        }
        """.utf8))
        if let member {
            apiService.ownProfileReturnValue = .success(member)
        }
        
        return HealthChatProfileEditScreenViewModel(userSession: UserSessionMock(.init(clientProxy: ClientProxyMock(.init()))),
                                                    apiService: apiService,
                                                    mediaUploadingPreprocessor: MediaUploadingPreprocessor(userSettings: .mock()),
                                                    userIndicatorController: UserIndicatorControllerMock())
    }
}