//
//  NavigationViewModel.swift
//  Ferrite
//
//  Created by Brian Dashore on 7/24/22.
//

import SwiftUI

enum ViewTab {
    case search
    case sources
    case settings
    case library
}

@MainActor
class NavigationViewModel: ObservableObject {
    var toastModel: ToastViewModel?

    // Used between SearchResultsView and MagnetChoiceView
    enum ChoiceSheetType: Identifiable {
        var id: Int {
            hashValue
        }

        case magnet
        case batch
        case activity
    }

    @Published var isEditingSearch: Bool = false
    @Published var isSearching: Bool = false

    @Published var selectedSearchResult: SearchResult?

    @Published var hideNavigationBar = false

    @Published var currentChoiceSheet: ChoiceSheetType?
    var activityItems: [Any] = []

    // Used to show the activity sheet in the share menu
    @Published var showLocalActivitySheet = false

    @Published var selectedTab: ViewTab = .search
    @Published var showSearchProgress: Bool = false

    // Used between SourceListView and SourceSettingsView
    @Published var showSourceSettings: Bool = false
    var selectedSource: Source?

    @Published var showSourceListEditor: Bool = false
    var selectedSourceList: SourceList?

    @AppStorage("Actions.DefaultDebrid") var defaultDebridAction: DefaultDebridActionType = .none
    @AppStorage("Actions.DefaultMagnet") var defaultMagnetAction: DefaultMagnetActionType = .none

    public func runDebridAction(urlString: String, _ action: DefaultDebridActionType? = nil) {
        let selectedAction = action ?? defaultDebridAction

        switch selectedAction {
        case .none:
            currentChoiceSheet = .magnet
        case .outplayer:
            if let downloadUrl = URL(string: "outplayer://\(urlString)") {
                UIApplication.shared.open(downloadUrl)
            } else {
                toastModel?.updateToastDescription("Could not create an Outplayer URL")
            }
        case .vlc:
            if let downloadUrl = URL(string: "vlc://\(urlString)") {
                UIApplication.shared.open(downloadUrl)
            } else {
                toastModel?.updateToastDescription("Could not create a VLC URL")
            }
        case .infuse:
            if let downloadUrl = URL(string: "infuse://x-callback-url/play?url=\(urlString)") {
                UIApplication.shared.open(downloadUrl)
            } else {
                toastModel?.updateToastDescription("Could not create a Infuse URL")
            }
        case .shareDownload:
            if let downloadUrl = URL(string: urlString), currentChoiceSheet == nil {
                activityItems = [downloadUrl]
                currentChoiceSheet = .activity
            } else {
                toastModel?.updateToastDescription("Could not create object for sharing")
            }
        }
    }

    public func runMagnetAction(magnetString: String?, _ action: DefaultMagnetActionType? = nil) {
        let selectedAction = action ?? defaultMagnetAction

        guard let magnetLink = magnetString else {
            toastModel?.updateToastDescription("Could not run your action because the magnet link is invalid.")
            print("Magnet action error: The magnet link is invalid.")

            return
        }

        switch selectedAction {
        case .none:
            currentChoiceSheet = .magnet
        case .webtor:
            if let url = URL(string: "https://webtor.io/#/show?magnet=\(magnetLink)") {
                UIApplication.shared.open(url)
            } else {
                toastModel?.updateToastDescription("Could not create a WebTor URL")
            }
        case .shareMagnet:
            if let magnetUrl = URL(string: magnetLink),
               currentChoiceSheet == nil
            {
                activityItems = [magnetUrl]
                currentChoiceSheet = .activity
            } else {
                toastModel?.updateToastDescription("Could not create object for sharing")
            }
        }
    }

    public func addToHistory(name: String?, source: String?, url: String?, subName: String? = nil) {
        let backgroundContext = PersistenceController.shared.backgroundContext

        let newHistoryEntry = HistoryEntry(context: backgroundContext)
        newHistoryEntry.name = name
        newHistoryEntry.source = source
        newHistoryEntry.url = url
        newHistoryEntry.subName = subName

        let now = Date()
        newHistoryEntry.timeStamp = now.timeIntervalSince1970

        let dateString = DateFormatter.historyDateFormatter.string(from: now)

        let historyRequest = History.fetchRequest()
        historyRequest.predicate = NSPredicate(format: "dateString = %@", dateString)

        if var histories = try? backgroundContext.fetch(historyRequest) {
            for (i, history) in histories.enumerated() {
                let existingEntries = history.entryArray.filter { $0.url == newHistoryEntry.url && $0.name == newHistoryEntry.name }

                if !existingEntries.isEmpty {
                    for entry in existingEntries {
                        PersistenceController.shared.delete(entry, context: backgroundContext)
                    }
                }

                if history.entryArray.isEmpty {
                    PersistenceController.shared.delete(history, context: backgroundContext)
                    histories.remove(at: i)
                }
            }

            newHistoryEntry.parentHistory = histories.first ?? History(context: backgroundContext)
        } else {
            newHistoryEntry.parentHistory = History(context: backgroundContext)
        }

        newHistoryEntry.parentHistory?.dateString = dateString
        newHistoryEntry.parentHistory?.date = now

        PersistenceController.shared.save(backgroundContext)
    }
}