using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using System.IO;
using System.Text;
using System;
using TEAMModelOS.SDK.DI;
using Azure;
using Azure.Storage.Blobs.Specialized;
using System.Threading.Tasks;

namespace TEAMModelOS.Filter
{
    public class BlobLoggerProvider: ILoggerProvider
    {
        private readonly AzureStorageFactory _storageFactory;

        public BlobLoggerProvider(AzureStorageFactory storageFactory)
        {
            _storageFactory=storageFactory;
            var container = _storageFactory.GetBlobContainerClient("0-service-log");
            container.CreateIfNotExists(PublicAccessType.None); //嘗試創建School容器，如存在則不做任何事，保障容器一定存在
        }

        public ILogger CreateLogger(string categoryName)
        {
            return new BlobLogger(categoryName, _storageFactory.GetBlobContainerClient("0-service-log"));
        }

        public void Dispose()
        {
            // Dispose any resources used by the provider.
        }
    }

    public class BlobLogger : ILogger
    {
        private readonly string _categoryName;
        private readonly BlobContainerClient _containerClient;

        public BlobLogger(string categoryName, BlobContainerClient containerClient)
        {
            _categoryName = categoryName;
            _containerClient = containerClient;
        }

        public IDisposable BeginScope<TState>(TState state)
        {
            return null;
        }

        public bool IsEnabled(LogLevel logLevel)
        {
            return true;
        }

        public async void Log<TState> ( LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
            if (formatter == null)
            {
                throw new ArgumentNullException(nameof(formatter));
            }
            var message = formatter(state, exception);
            var appendBlob = _containerClient.GetAppendBlobClient($"{_categoryName}/{DateTimeOffset.UtcNow:yyyy-MM-dd}.log");
            // var blobClient = _containerClient.GetBlobClient($"{_categoryName}/{DateTimeOffset.UtcNow:yyyy-MM-dd}.log");
            if (!appendBlob.Exists())
            {
               await appendBlob.CreateAsync();
                using var stream = new MemoryStream(Encoding.UTF8.GetBytes(message));
               await appendBlob.AppendBlockAsync(stream);
            }
            else {
                using var stream = new MemoryStream(Encoding.UTF8.GetBytes($"\n,{message}"));
             await   appendBlob.AppendBlockAsync(stream);
            }
        }
    }
}