using Android;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Service.Autofill;
using Android.Widget;
using Bit.App;
using Bit.App.Abstractions;
using Bit.App.Enums;
using System.Linq;
using XLabs.Ioc;

namespace Bit.Android.Autofill
{
    [Service(Permission = Manifest.Permission.BindAutofillService, Label = "bitwarden")]
    [IntentFilter(new string[] { "android.service.autofill.AutofillService" })]
    [MetaData("android.autofill", Resource = "@xml/autofillservice")]
    [Register("com.x8bit.bitwarden.Autofill.AutofillService")]
    public class AutofillService : global::Android.Service.Autofill.AutofillService
    {
        private ICipherService _cipherService;
        private ILockService _lockService;

        public async override void OnFillRequest(FillRequest request, CancellationSignal cancellationSignal, FillCallback callback)
        {
            var structure = request.FillContexts?.LastOrDefault()?.Structure;
            if(structure == null)
            {
                return;
            }

            var parser = new Parser(structure);
            parser.Parse();

            if(string.IsNullOrWhiteSpace(parser.Uri) || parser.Uri == "androidapp://com.x8bit.bitwarden" ||
                parser.Uri == "androidapp://android" || !parser.FieldCollection.FillableForLogin)
            {
                return;
            }

            if(_lockService == null)
            {
                _lockService = Resolver.Resolve<ILockService>();
            }

            var isLocked = (await _lockService.GetLockTypeAsync(false)) != LockType.None;
            if(isLocked)
            {
                var authResponse = AutofillHelpers.BuildAuthResponse(this, parser.FieldCollection, parser.Uri);
                callback.OnSuccess(authResponse);
                return;
            }

            if(_cipherService == null)
            {
                _cipherService = Resolver.Resolve<ICipherService>();
            }

            // build response
            var items = await AutofillHelpers.GetFillItemsAsync(_cipherService, parser.Uri);
            var response = AutofillHelpers.BuildFillResponse(this, parser.FieldCollection, items);
            callback.OnSuccess(response);
        }

        public override void OnSaveRequest(SaveRequest request, SaveCallback callback)
        {
            var structure = request.FillContexts?.LastOrDefault()?.Structure;
            if(structure == null)
            {
                return;
            }

            var parser = new Parser(structure);
            parser.Parse();

            var savedItem = parser.FieldCollection.GetSavedItem();
            if(savedItem == null)
            {
                Toast.MakeText(this, "Unable to save this form.", ToastLength.Short).Show();
                return;
            }

            var intent = new Intent(this, typeof(MainActivity));
            intent.SetFlags(ActivityFlags.NewTask | ActivityFlags.ClearTop);
            intent.PutExtra("autofillFramework", true);
            intent.PutExtra("autofillFrameworkSave", true);
            intent.PutExtra("autofillFrameworkType", (int)savedItem.Type);
            switch(savedItem.Type)
            {
                case CipherType.Login:
                    intent.PutExtra("autofillFrameworkName", parser.Uri.Replace(Constants.AndroidAppProtocol, string.Empty));
                    intent.PutExtra("autofillFrameworkUri", parser.Uri);
                    intent.PutExtra("autofillFrameworkUsername", savedItem.Login.Username);
                    intent.PutExtra("autofillFrameworkPassword", savedItem.Login.Password);
                    break;
                default:
                    Toast.MakeText(this, "Unable to save this type of form.", ToastLength.Short).Show();
                    return;
            }
            StartActivity(intent);
        }
    }
}