// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.

import Foundation
import GRDB
import DifferenceKit
import SessionUIKit
import SessionMessagingKit
import SessionUtilitiesKit

class HelpViewModel: SettingsTableViewModel<HelpViewModel.Section, HelpViewModel.Section> {
    // MARK: - Section
    
    public enum Section: SettingSection {
        case report
        case translate
        case feedback
        case faq
        case support
        
        var title: String { "" }    // No titles
    }
    
    // MARK: - Content
    
    override var title: String { "HELP_TITLE".localized() }
    
    private var _settingsData: [SectionModel] = []
    public override var settingsData: [SectionModel] { _settingsData }
    
    public override var observableSettingsData: ObservableData { _observableSettingsData }
    
    /// This is all the data the screen needs to populate itself, please see the following link for tips to help optimise
    /// performance https://github.com/groue/GRDB.swift#valueobservation-performance
    ///
    /// **Note:** This observation will be triggered twice immediately (and be de-duped by the `removeDuplicates`)
    /// this is due to the behaviour of `ValueConcurrentObserver.asyncStartObservation` which triggers it's own
    /// fetch (after the ones in `ValueConcurrentObserver.asyncStart`/`ValueConcurrentObserver.syncStart`)
    /// just in case the database has changed between the two reads - unfortunately it doesn't look like there is a way to prevent this
    private lazy var _observableSettingsData: ObservableData = ValueObservation
        .trackingConstantRegion { db -> [SectionModel] in
            return [
                SectionModel(
                    model: .report,
                    elements: [
                        SettingInfo(
                            id: .report,
                            title: "HELP_REPORT_BUG_TITLE".localized(),
                            subtitle: "HELP_REPORT_BUG_DESCRIPTION".localized(),
                            action: .rightButtonModal(
                                title: "HELP_REPORT_BUG_ACTION_TITLE".localized(),
                                createModal: {
                                    let shareLogsModal: ShareLogsModal = ShareLogsModal()
                                    shareLogsModal.modalPresentationStyle = .overFullScreen
                                    shareLogsModal.modalTransitionStyle = .crossDissolve
                                    
                                    return shareLogsModal
                                }
                            )
                        )
                    ]
                ),
                SectionModel(
                    model: .translate,
                    elements: [
                        SettingInfo(
                            id: .translate,
                            title: "HELP_TRANSLATE_TITLE".localized(),
                            action: .trigger(action: {
                                guard let url: URL = URL(string: "https://crowdin.com/project/session-ios") else {
                                    return
                                }
                                
                                UIApplication.shared.open(url)
                            })
                        )
                    ]
                ),
                SectionModel(
                    model: .feedback,
                    elements: [
                        SettingInfo(
                            id: .feedback,
                            title: "HELP_FEEDBACK_TITLE".localized(),
                            action: .trigger(action: {
                                guard let url: URL = URL(string: "https://getsession.org/survey") else {
                                    return
                                }
                                
                                UIApplication.shared.open(url)
                            })
                        )
                    ]
                ),
                SectionModel(
                    model: .faq,
                    elements: [
                        SettingInfo(
                            id: .faq,
                            title: "HELP_FAQ_TITLE".localized(),
                            action: .trigger(action: {
                                guard let url: URL = URL(string: "https://getsession.org/faq") else {
                                    return
                                }
                                
                                UIApplication.shared.open(url)
                            })
                        )
                    ]
                ),
                SectionModel(
                    model: .support,
                    elements: [
                        SettingInfo(
                            id: .support,
                            title: "HELP_SUPPORT_TITLE".localized(),
                            action: .trigger(action: {
                                guard let url: URL = URL(string: "https://sessionapp.zendesk.com/hc/en-us") else {
                                    return
                                }
                                
                                UIApplication.shared.open(url)
                            })
                        )
                    ]
                )
            ]
        }
        .removeDuplicates()
    
    // MARK: - Functions

    public override func updateSettings(_ updatedSettings: [SectionModel]) {
        self._settingsData = updatedSettings
    }
    
    public override func saveChanges() {}
}