using Azure.Messaging.ServiceBus;
using Microsoft.Extensions.Logging;
using System;
using System.Text.Json;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Azure.Storage.Blobs;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.Functions.Worker.Http;
using Microsoft.Azure.Functions.Worker;
using System.Net;
using Microsoft.DurableTask;
using Microsoft.DurableTask.Client;
using FromBodyAttribute = Microsoft.Azure.Functions.Worker.Http.FromBodyAttribute;

namespace CDP
{
    public class MetaProcessor
    {
        private readonly ILogger<MetaProcessor> _logger;
        private static Lazy<ServiceBusClient> lazyBusClient = new Lazy<ServiceBusClient>(InitializeServiceBusClient);
        private static ServiceBusClient _serviceBusClient = lazyBusClient.Value;

        public MetaProcessor(ILogger<MetaProcessor> logger)
        {
            _logger = logger;
        }

        private static ServiceBusClient InitializeServiceBusClient()
        {
            return new ServiceBusClient(Constants.SvcBusConnectionString);
        }

        public static async Task PublishBatchJobs(List<Job> jobs)
        {
            //Job[] jobsCopy = jobs.ToArray();
            var sender = _serviceBusClient.CreateSender("mail-events-queue");
            ServiceBusMessageBatch batch = await sender.CreateMessageBatchAsync();
            jobs.ForEach(job =>
            {
                var msg = new ServiceBusMessage(JsonSerializer.Serialize(job));
                bool isAdded = batch.TryAddMessage(msg);
            });
            await sender.SendMessagesAsync(batch);

        }

        public static async Task PublishJob(Job job)
        {
            var sender = _serviceBusClient.CreateSender("mail-events-queue");
            ServiceBusMessage msg = new ServiceBusMessage(JsonSerializer.Serialize(job));
            await sender.SendMessageAsync(msg);
        }
        [Function("MailMetaProcessor")]
        public async Task<Job> MailMetaProcessor([ActivityTrigger] MailRecord mailRecord, FunctionContext functionContext)
        {
            Job job = await TriggerMailProcessor(mailRecord);
            return job;
        }

        [Function("MailMetaOrchestrator")]
        public async Task<Job> MailMetaOrchestrator([OrchestrationTrigger] TaskOrchestrationContext ctx)
        {
            try
            {
                MailRecord record = ctx.GetInput<MailRecord>();
                string jobId = await ctx.CallActivityAsync<string>(nameof(AddProtectionAudits), record);
                Job job = await ctx.CallActivityAsync<Job>(nameof(MailMetaProcessor), record);
                string revId = await ctx.CallActivityAsync<string>(nameof(AddMailCompundRevision), record);
                return job;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
                return new Job() { AppKey = "", EventType = JobType.MailMetaProcessing, Id = "failed" };
            }
        }

        [Function("AddMailMetaDurable")]
        public async Task<HttpResponseData> AddMailMetaDurable([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req,
            [FromBody] MailRecord recordMail,
            [DurableClient] DurableTaskClient client)
        {
            bool isValid = true;
            //bool isValid = await CDPLite.CheckJwtRequest(req);
            
            if (!isValid)
            {
                HttpResponseData res = req.CreateResponse(HttpStatusCode.Unauthorized);
                return res;
            }
            try
            {
                string instanceId = await client.ScheduleNewOrchestrationInstanceAsync(nameof(MailMetaOrchestrator), recordMail);
                _logger.LogInformation("created instance: {0}", instanceId);
                return client.CreateCheckStatusResponse(req, instanceId);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.ToString());
                HttpResponseData response = req.CreateResponse(HttpStatusCode.InternalServerError);
                return response;
            }
        }

        [Function("AddMailMeta")]
        public async Task<ActionResult> AddMailMeta([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req, [FromBody] MailRecord recordMail)
        {
            bool isValid = true;
            //bool isValid = await CDPLite.CheckJwtRequest(req);
            if (!isValid)
            {
                return new UnauthorizedObjectResult("Jwt has expired please validate");
            }
            try
            {
                MailRecord mailRecord = recordMail;
                //_logger.LogInformation(JsonSerializer.Serialize(recordMail));
                string res = await TriggerProtectionAuditsJob(mailRecord);
                res = await AddMailCompoundRevisionInternal(mailRecord);
                _logger.LogInformation($"protection audits? {res}");
                Job job = await TriggerMailProcessor(mailRecord);
                return new OkObjectResult(job);

            }
            catch (Exception ex)
            {
                _logger.LogError(ex.ToString());
                return new StatusCodeResult(500);
            }

        }

        [Function("AddMailForwardingRequest")]
        public async Task<IActionResult> AddMailForwardingRequest([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req)
        {
            ForwardMailDto forwardMail;
            try
            {
                string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
                _logger.LogInformation("requestbody: {0}", requestBody);
                forwardMail = JsonSerializer.Deserialize<ForwardMailDto>(requestBody);
            }
            catch (Exception ex)
            {
                _logger.LogInformation(ex.ToString());
                return new StatusCodeResult(500);
            }
            string appKey = forwardMail.AppKey;
            var userId = Helpers.HashAndShortenText(forwardMail.SenderEmail.ToLower());
            var fr = await CDPDB.GetFile(appKey, forwardMail.MailId, userId);
            if ((!fr.Policy.CheckAccess("Manage")) && (!fr.Policy.CheckAccess("Owner")))
            {
                return new UnauthorizedObjectResult("User doesn't have rights to forward this email");
            }
            RevisionEntry entry = await FileRevision.GetFileRevisionInternal(forwardMail.AppKey, forwardMail.MailId);
            if (entry.CompoundDocument == null)
            {
                return new BadRequestObjectResult("IncorrectMailId");
            }
            MailMetaRecord mailRecord = JsonSerializer.Deserialize<MailMetaRecord>(entry.CompoundDocument.Contents);

            mailRecord.AttachmentDetails.ForEach(async (att) =>
            {
                forwardMail.ReceiverEmails.ForEach(async (receiver) =>
                {
                    await AddMailForwardPolicy(appKey, att.FileId, att.FileName, forwardMail.SenderEmail, receiver, "Read");
                });
            });

            forwardMail.ReceiverEmails.ForEach(async (receiver) =>
            {
                await AddMailForwardPolicy(appKey, mailRecord.BodyId, string.Concat(mailRecord.BodyId, "-", "MailBody"), forwardMail.SenderEmail, receiver, "Read");
            });

            return new OkObjectResult("Done");
        }

        internal async Task AddMailForwardPolicy(string appKey, string fileId, string fileName, string sender, string receiver, string policy = "Read")
        {
            AddFileUserDto addFileUserDto = new AddFileUserDto
            {
                AppKey = appKey,
                FileId = fileId,
                FileName = fileName,
                Email = sender,
                EmailToAdd = receiver,
                Policy = policy
            };
            await CDPLite.AddFileUserInternal(addFileUserDto);
        }

        [Function("AddMailCompundRevision")]
        public async Task<string> AddMailCompundRevision([ActivityTrigger] MailRecord record, FunctionContext context)
        {

            return await AddMailCompoundRevisionInternal(record);
        }

        internal async Task<string> AddMailCompoundRevisionInternal(MailRecord record)
        {
            RevisionDocument doc = new RevisionDocument
            {
                RevisionId = Guid.NewGuid().ToString(),
                RevisionDate = DateTime.UtcNow,
                EditedBy = record.SenderEmail,
                Comments = "MailBody"
            };
            MailMetaRecord mailMeta = new MailMetaRecord
            {
                AppKey = record.AppKey,
                SenderEmail = record.SenderEmail,
                BodyContent = record.BodyContent,
                BodyId = record.MailId,
                AttachmentDetails = record.AttachmentDetails
            };
            CompoundDocument compound = new CompoundDocument
            {
                Id = Guid.NewGuid().ToString(),
                AppKey = record.AppKey,
                Contents = JsonSerializer.Serialize(mailMeta),
                DocumentType = "MailRecord"
            };

            string revisionId = await FileRevision.AddMailBodyRevision(doc, compound, record.AppKey, record.MailId);
            return revisionId;
        }

        [Function("AddProtectionAudits")]
        public async Task<string> AddProtectionAudits([ActivityTrigger] MailRecord record, FunctionContext functionContext)
        {
            var res = await TriggerProtectionAuditsJob(record);
            return res;
        }

        internal async Task<string> TriggerProtectionAuditsJob(MailRecord record)
        {
            try
            {
                string userId = Helpers.HashAndShortenText(record.SenderEmail);
                string message = string.Format($"{record.SenderEmail} protected an email body with id: {record.MailId}.");
                List<AuditEventMetadata> auditEvents = new List<AuditEventMetadata>();
                AuditEventMetadata auditEvent = new AuditEventMetadata { Action = "Addded", FileId = record.MailId, FileName = "Outlook-Mail-Body", Message = message, UserId = userId };
                auditEvents.Add(auditEvent);
                record.AttachmentDetails.ForEach((att) =>
                {
                    message = string.Format($"{record.SenderEmail} protected the email attachment {att.FileName} with id: {att.FileId}.");
                    AuditEventMetadata attachmentEvent = new AuditEventMetadata { Action = "Added", FileId = att.FileId, FileName = att.FileName, Message = message, UserId = userId };
                    auditEvents.Add(attachmentEvent);
                });
                Job job = await CDPLite.AddAuditsBatchedEvent(auditEvents, record.AppKey);
                await PublishJob(job);
                _logger.LogInformation(JsonSerializer.Serialize(job));
                return "Done";
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.ToString());
                throw ex;
            }
        }

        internal async Task<Job> TriggerMailProcessor(MailRecord mailRecord)
        {
            string Connection = Constants.StorageConnString;
            var blobSvc = new BlobServiceClient(Connection);
            var blobClient = blobSvc.GetBlobContainerClient(mailRecord.AppKey.ToLower());

            if (!blobClient.Exists())
            {
                await blobClient.CreateAsync();
            }
            byte[] fileBytes = System.Text.Encoding.UTF8.GetBytes(JsonSerializer.Serialize(mailRecord));
            string jobId = Guid.NewGuid().ToString();
            var blob = blobClient.GetBlobClient(jobId);
            Stream fs = new MemoryStream(fileBytes);
            try
            {
                await blob.UploadAsync(fs);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.ToString());
                throw ex;
            }

            Job job = new Job { AppKey = mailRecord.AppKey, EventType = JobType.MailMetaProcessing, Id = jobId };
            await PublishJob(job);
            return job;
        }
    }

    public class MailMetaRecord
    {
        public required string AppKey { get; set; }
        public required string SenderEmail { get; set; }
        public required string BodyId { get; set; }
        public required string BodyContent { get; set; } //encrypted body
        public required List<AttachmentDetails> AttachmentDetails { get; set; }
    }

    public class ForwardMailDto
    {
        public string SenderEmail { get; set; }
        public List<string> ReceiverEmails { get; set; }
        public string MailId { get; set; }
        public string AppKey { get; set; }
    }
}