//
//  CredentialProviderViewController.swift
//  AutoFill
//
//  Created by Christophe Vila on 19/09/2026.
//

import AuthenticationServices
import SwiftUI
import MyPassCore

final class CredentialProviderViewController: ASCredentialProviderViewController {

    private let session = VaultSession()
    private let bookmarkService = FileBookmarkService()
    private let keychainStore = KeychainStore(accessGroup: "org.antiloop222.mypass")
    private let biometricService = BiometricAuthService()

    // Called when the user selects MyPass from the QuickType bar.
    override func prepareCredentialList(for serviceIdentifiers: [ASCredentialServiceIdentifier]) {
        let ids = serviceIdentifiers.map(\.identifier)
        showUI(serviceIdentifiers: ids)
    }

    // Called for inline QuickType suggestion (no UI shown).
    override func provideCredentialWithoutUserInteraction(for credentialIdentity: ASPasswordCredentialIdentity) {
        Task {
            do {
                try await unlockSilently()
                let all = session.allEntries()
                if let entry = all.first(where: { $0.id.uuidString == credentialIdentity.recordIdentifier }) {
                    let credential = ASPasswordCredential(user: entry.username, password: entry.password.reveal())
                    self.extensionContext.completeRequest(withSelectedCredential: credential, completionHandler: nil)
                } else {
                    self.extensionContext.cancelRequest(withError: ASExtensionError(.credentialIdentityNotFound))
                }
            } catch {
                self.extensionContext.cancelRequest(withError: ASExtensionError(.userInteractionRequired))
            }
        }
    }

    private func unlockSilently() async throws {
        guard session.isLocked else { return }
        let password = try keychainStore.load(for: "masterPassword")
        let url = try bookmarkService.resolveURL()
        defer { bookmarkService.stopAccess(url: url) }
        try session.unlock(url: url, password: password)
    }

    private func showUI(serviceIdentifiers: [String]) {
        let rootView = ExtensionRootView(
            session: session,
            serviceIdentifiers: serviceIdentifiers,
            bookmarkService: bookmarkService,
            keychainStore: keychainStore,
            biometricService: biometricService,
            onSelect: { [weak self] (entry: Entry) in
                let credential = ASPasswordCredential(
                    user: entry.username,
                    password: entry.password.reveal()
                )
                self?.extensionContext.completeRequest(withSelectedCredential: credential, completionHandler: nil)
            },
            onCancel: { [weak self] in
                self?.extensionContext.cancelRequest(withError: ASExtensionError(.userCanceled))
            }
        )
        let host = UIHostingController(rootView: rootView)
        addChild(host)
        view.addSubview(host.view)
        host.view.frame = view.bounds
        host.view.autoresizingMask = [UIView.AutoresizingMask.flexibleWidth, UIView.AutoresizingMask.flexibleHeight]
        host.didMove(toParent: self)
    }
}