import FamilyControls
import SwiftUI

@main
struct FamilyQuestsApp: App {
    @StateObject private var model = AppModel()
    @Environment(\.scenePhase) private var scenePhase

    var body: some Scene {
        WindowGroup {
            RootView(model: model)
                .task { await model.synchronize() }
                .onChange(of: scenePhase) { _, phase in
                    if phase == .active { Task { await model.synchronize() } }
                    if phase == .background { model.closeParentSetup() }
                }
        }
    }
}

struct RootView: View {
    @ObservedObject var model: AppModel
    @State private var server = ""
    @State private var code = ""
    @State private var configurationCode = ""
    @State private var replacementCode = ""

    var body: some View {
        NavigationStack {
            Form {
                if model.credentials == nil {
                    Section("Parent: pair this iPhone") {
                        Text("Create a child and a pairing code in the parent web dashboard. A guardian must approve Apple Family Controls.")
                        TextField("https://your-server.example", text: $server)
                            .textInputAutocapitalization(.never).autocorrectionDisabled().keyboardType(.URL)
                        SecureField("Single-use pairing code", text: $code)
                            .textInputAutocapitalization(.never).autocorrectionDisabled()
                        Button("Pair and request guardian approval") {
                            let submitted = code; code = ""
                            Task { await model.pair(server: server, code: submitted) }
                        }
                    }
                } else {
                    Section(model.snapshot?.childName ?? "My time") {
                        if let snapshot = model.snapshot {
                            LabeledContent("Daily allowance", value: "\(snapshot.policy.dailyMinutes) minutes")
                            LabeledContent("Bonus earned today", value: "\(snapshot.bonus(at: Date())) minutes")
                            Text("This is your allowance, not a live remaining-time counter. Rewards expire at the end of the family day and never extend bedtime.")
                                .font(.footnote).foregroundStyle(.secondary)
                        }
                        Text(model.status?.detail ?? "Open or sync the app to check configuration")
                        Button("Sync policy and rewards") { Task { await model.synchronize() } }
                    }
                    Section("Maths challenge") {
                        if let challenge = model.challenge {
                            ForEach(challenge.questions) { question in
                                HStack {
                                    Text("\(question.prompt) =")
                                    TextField("Answer", text: Binding(
                                        get: { model.answers[question.id, default: ""] },
                                        set: { model.answers[question.id] = $0 }
                                    )).keyboardType(.numberPad).multilineTextAlignment(.trailing)
                                        .accessibilityLabel("Answer to \(question.prompt)")
                                }
                            }
                            Button("Check answers") { Task { await model.submitChallenge() } }
                        } else {
                            Text("Answer every question correctly to earn bonus app usage. An internet connection is required to verify answers.")
                            Button("Start challenge") { Task { await model.startChallenge() } }
                                .disabled(model.status?.state != "monitoring")
                        }
                        if !model.rewardMessage.isEmpty { Text(model.rewardMessage) }
                    }
                    Section("Parent setup") {
                        Text("App selection requires a fresh configuration code from the parent dashboard. Do not restrict this app, Phone, or other essential communication and school apps.")
                            .font(.footnote)
                        Button("Request guardian Screen Time authorization") { Task { await model.authorize() } }
                        SecureField("Configuration code", text: $configurationCode)
                            .textInputAutocapitalization(.never).autocorrectionDisabled()
                        Button("Authorize app selection") {
                            let value = configurationCode; configurationCode = ""
                            Task { await model.unlockConfiguration(code: value) }
                        }
                        DisclosureGroup("Replace revoked pairing") {
                            Text("The parent must revoke the old pairing and issue a new pairing code. The server address remains fixed.")
                            SecureField("New pairing code", text: $replacementCode)
                                .textInputAutocapitalization(.never).autocorrectionDisabled()
                            Button("Pair again with the same server") {
                                let value = replacementCode; replacementCode = ""
                                Task { await model.pair(server: "", code: value) }
                            }
                        }
                    }
                }
                if !model.message.isEmpty {
                    Section("Needs attention") { Text(model.message).foregroundStyle(.red) }
                }
                if model.busy { ProgressView("Working…") }
                Section { Text("Development MVP. DeviceActivity behavior must be tested on this iOS version before relying on it.").font(.footnote) }
            }
            .disabled(model.busy)
            .navigationTitle("Family Quests")
            .sheet(isPresented: $model.pickerPresented, onDismiss: { model.closeParentSetup() }) {
                NavigationStack {
                    VStack {
                        Text("Choose individual entertainment apps only. Leave Family Quests and essential apps accessible.")
                            .font(.footnote).padding()
                        FamilyActivityPicker(selection: $model.draftSelection)
                    }
                    .navigationTitle("Parent app selection")
                    .toolbar {
                        ToolbarItem(placement: .cancellationAction) { Button("Cancel") { model.closeParentSetup() } }
                        ToolbarItem(placement: .confirmationAction) {
                            Button("Save") { Task { await model.saveSelection() } }.disabled(model.busy)
                        }
                    }
                    .safeAreaInset(edge: .bottom) {
                        if !model.message.isEmpty { Text(model.message).font(.footnote).padding() }
                    }
                }
            }
        }
    }
}