import PermissionKit

import PermissionKit

func checkCommunicationStatus(for handle: CommunicationHandle) async -> Bool {
    let limits = CommunicationLimits.current
    let isKnown = await limits.isKnownHandle(handle)
    return isKnown
}

// Check multiple handles at once
func filterKnownHandles(_ handles: Set<CommunicationHandle>) async -> Set<CommunicationHandle> {
    let limits = CommunicationLimits.current
    return await limits.knownHandles(in: handles)
}

let phoneHandle = CommunicationHandle(
    value: "+1234567890",
    kind: .phoneNumber
)

let emailHandle = CommunicationHandle(
    value: "friend@example.com",
    kind: .emailAddress
)

let customHandle = CommunicationHandle(
    value: "user123",
    kind: .custom
)

// Question for a single contact
let handle = CommunicationHandle(value: "+1234567890", kind: .phoneNumber)
let question = PermissionQuestion<CommunicationTopic>(handle: handle)

// Question for multiple contacts
let handles = [
    CommunicationHandle(value: "+1234567890", kind: .phoneNumber),
    CommunicationHandle(value: "friend@example.com", kind: .emailAddress)
]
let multiQuestion = PermissionQuestion<CommunicationTopic>(handles: handles)

let personInfo = CommunicationTopic.PersonInformation(
    handle: CommunicationHandle(value: "+1234567890", kind: .phoneNumber),
    nameComponents: {
        var name = PersonNameComponents()
        name.givenName = "Alex"
        name.familyName = "Smith"
        return name
    }(),
    avatarImage: nil
)

let topic = CommunicationTopic(
    personInformation: [personInfo],
    actions: [.message, .audioCall]
)

let question = PermissionQuestion<CommunicationTopic>(communicationTopic: topic)

import PermissionKit

func requestPermission(
    for question: PermissionQuestion<CommunicationTopic>,
    in viewController: UIViewController
) async {
    do {
        try await AskCenter.shared.ask(question, in: viewController)
        // Question was presented to the child
    } catch let error as AskError {
        switch error {
        case .communicationLimitsNotEnabled:
            // Communication limits not active -- no permission needed
            break
        case .contactSyncNotSetup:
            // Contact sync not configured
            break
        case .invalidQuestion:
            // Question is malformed
            break
        case .notAvailable:
            // PermissionKit not available on this device
            break
        case .systemError(let underlying):
            print("System error: \(underlying)")
        case .unknown:
            break
        @unknown default:
            break
        }
    }
}

import SwiftUI
import PermissionKit

struct ContactPermissionView: View {
    let handle = CommunicationHandle(value: "+1234567890", kind: .phoneNumber)

    var body: some View {
        let question = PermissionQuestion<CommunicationTopic>(handle: handle)

        PermissionButton(question: question) {
            Label("Ask to Message", systemImage: "message")
        }
    }
}

struct CustomPermissionView: View {
    var body: some View {
        let personInfo = CommunicationTopic.PersonInformation(
            handle: CommunicationHandle(value: "user456", kind: .custom),
            nameComponents: nil,
            avatarImage: nil
        )
        let topic = CommunicationTopic(
            personInformation: [personInfo],
            actions: [.follow]
        )
        let question = PermissionQuestion<CommunicationTopic>(
            communicationTopic: topic
        )

        PermissionButton(question: question) {
            Text("Ask to Follow")
        }
    }
}

func observeResponses() async {
    let responses = AskCenter.shared.responses(for: CommunicationTopic.self)

    for await response in responses {
        let choice = response.choice
        let question = response.question

        switch choice.answer {
        case .approval:
            // Parent approved -- enable communication
            print("Approved for topic: \(question.topic)")
        case .denial:
            // Parent denied -- keep restriction
            print("Denied")
        @unknown default:
            break
        }
    }
}

let choice: PermissionChoice = response.choice
print("Answer: \(choice.answer)")  // .approval or .denial
print("Choice ID: \(choice.id)")
print("Title: \(choice.title)")

// Convenience statics
let approved = PermissionChoice.approve
let declined = PermissionChoice.decline

let updateTopic = SignificantAppUpdateTopic(
    description: "This update adds multiplayer chat features"
)

let question = PermissionQuestion<SignificantAppUpdateTopic>(
    significantAppUpdateTopic: updateTopic
)

// Present the question
try await AskCenter.shared.ask(question, in: viewController)

// Listen for responses
for await response in AskCenter.shared.responses(for: SignificantAppUpdateTopic.self) {
    switch response.choice.answer {
    case .approval:
        // Proceed with update
        break
    case .denial:
        // Skip update
        break
    @unknown default:
        break
    }
}

// WRONG: Assuming limits are always active
try await AskCenter.shared.ask(question, in: viewController)

// CORRECT: Handle the case where limits are not enabled
do {
    try await AskCenter.shared.ask(question, in: viewController)
} catch AskError.communicationLimitsNotEnabled {
    // Communication limits not active -- allow communication directly
    allowCommunication()
} catch {
    handleError(error)
}

// WRONG: Catch-all with no user feedback
do {
    try await AskCenter.shared.ask(question, in: viewController)
} catch {
    print(error)
}

// CORRECT: Handle each case
do {
    try await AskCenter.shared.ask(question, in: viewController)
} catch let error as AskError {
    switch error {
    case .communicationLimitsNotEnabled:
        allowCommunication()
    case .contactSyncNotSetup:
        showContactSyncPrompt()
    case .invalidQuestion:
        showInvalidQuestionAlert()
    case .notAvailable:
        showUnavailableMessage()
    case .systemError(let underlying):
        showSystemError(underlying)
    case .unknown:
        showGenericError()
    @unknown default:
        break
    }
}

// WRONG: Empty handles array
let question = PermissionQuestion<CommunicationTopic>(handles: [])  // Invalid

// CORRECT: Provide at least one handle
let handle = CommunicationHandle(value: "+1234567890", kind: .phoneNumber)
let question = PermissionQuestion<CommunicationTopic>(handle: handle)

// WRONG: Fire and forget
try await AskCenter.shared.ask(question, in: viewController)

// CORRECT: Observe responses
Task {
    for await response in AskCenter.shared.responses(for: CommunicationTopic.self) {
        handleResponse(response)
    }
}
try await AskCenter.shared.ask(question, in: viewController)

// WRONG: Deprecated
CommunicationLimitsButton(question: question) {
    Text("Ask Permission")
}

// CORRECT: Use PermissionButton
PermissionButton(question: question) {
    Text("Ask Permission")
}