/* JellyfinPlayer/Swiftfin is subject to the terms of the Mozilla Public
 * License, v2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * Copyright 2021 Aiden Vigue & Jellyfin Contributors
 */

import CoreData
import SwiftUI

struct SettingsView: View {
    @ObservedObject
    var viewModel: SettingsViewModel

    @Binding
    var close: Bool
    @Environment(\.managedObjectContext)
    private var viewContext
    @EnvironmentObject
    var globalData: GlobalData
    @EnvironmentObject
    var jsi: justSignedIn
    @State
    private var username: String = ""
    @State
    private var inNetworkStreamBitrate: Int = 40_000_000
    @State
    private var outOfNetworkStreamBitrate: Int = 40_000_000
    @State
    private var autoSelectSubtitles: Bool = false
    @State
    private var autoSelectSubtitlesLangcode: String = "none"

    func onAppear() {
        _username.wrappedValue = globalData.user.username ?? ""
        let defaults = UserDefaults.standard
        _inNetworkStreamBitrate.wrappedValue = defaults.integer(forKey: "InNetworkBandwidth")
        _outOfNetworkStreamBitrate.wrappedValue = defaults.integer(forKey: "OutOfNetworkBandwidth")
        _autoSelectSubtitles.wrappedValue = defaults.bool(forKey: "AutoSelectSubtitles")
        _autoSelectSubtitlesLangcode.wrappedValue = defaults.string(forKey: "AutoSelectSubtitlesLangcode") ?? ""
    }

    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Playback settings")) {
                    Picker("Default local quality", selection: $inNetworkStreamBitrate) {
                        ForEach(self.viewModel.bitrates, id: \.self) { bitrate in
                            Text(bitrate.name).tag(bitrate.value)
                        }
                    }.onChange(of: inNetworkStreamBitrate) { _ in
                        let defaults = UserDefaults.standard
                        defaults.setValue(_inNetworkStreamBitrate.wrappedValue, forKey: "InNetworkBandwidth")
                    }

                    Picker("Default remote quality", selection: $outOfNetworkStreamBitrate) {
                        ForEach(self.viewModel.bitrates, id: \.self) { bitrate in
                            Text(bitrate.name).tag(bitrate.value)
                        }
                    }.onChange(of: outOfNetworkStreamBitrate) { _ in
                        let defaults = UserDefaults.standard
                        defaults.setValue(_outOfNetworkStreamBitrate.wrappedValue, forKey: "OutOfNetworkBandwidth")
                    }
                }

                Section(header: Text("Accessibility")) {
                    Toggle("Automatically show subtitles", isOn: $autoSelectSubtitles).onChange(of: autoSelectSubtitles, perform: { _ in
                        let defaults = UserDefaults.standard
                        defaults.setValue(autoSelectSubtitles, forKey: "AutoSelectSubtitles")
                    })
                    Picker("Language preferences", selection: $autoSelectSubtitlesLangcode) {}
                }

                Section {
                    HStack {
                        Text("Signed in as \(username)").foregroundColor(.primary)
                        Spacer()
                        Button {
                            let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "Server")
                            let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)

                            do {
                                try viewContext.execute(deleteRequest)
                            } catch _ as NSError {
                                // TODO: handle the error
                            }

                            let fetchRequest2: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "SignedInUser")
                            let deleteRequest2 = NSBatchDeleteRequest(fetchRequest: fetchRequest2)

                            do {
                                try viewContext.execute(deleteRequest2)
                            } catch _ as NSError {
                                // TODO: handle the error
                            }

                            globalData.server = Server()
                            globalData.user = SignedInUser()
                            globalData.authToken = ""
                            globalData.authHeader = ""
                            jsi.did = true
                            // TODO: This should redirect to the server selection screen
                            exit(-1)
                        } label: {
                            Text("Log out").font(.callout)
                        }
                    }
                }
            }

            .navigationBarTitle("Settings", displayMode: .inline)
            .toolbar {
                ToolbarItemGroup(placement: .navigationBarLeading) {
                    Button {
                        close = false
                    } label: {
                        Text("Back").font(.callout)
                    }
                }
            }
        }.onAppear(perform: onAppear)
    }
}

struct UserSettings: Decodable {
    var LocalMaxBitrate: Int;
    var RemoteMaxBitrate: Int;
    var AutoSelectSubtitles: Bool;
    var AutoSelectSubtitlesLangcode: String;
    var SubtitlePositionOffset: Int;
    var SubtitleFontName: String;
}

struct Bitrates: Codable, Hashable {
    public var name: String
    public var value: Int
}

final class SettingsViewModel: ObservableObject {
    var bitrates: [Bitrates] = []

    init() {
        let url = Bundle.main.url(forResource: "bitrates", withExtension: "json")!

        do {
            let jsonData = try Data(contentsOf: url, options: .mappedIfSafe)
            do {
                self.bitrates = try JSONDecoder().decode([Bitrates].self, from: jsonData)
            } catch {
                print(error)
            }
        } catch {
            print(error)
        }
    }
}