using System;
using System.Net;
using System.Threading.Tasks;
using Serilog;
using Microsoft.AspNetCore.Mvc;
using CRIF.ACTion.Services.Crif;
using Landmark.OLA.Application.Common.Security;
using Landmark.OLA.Application.DataAccessLayer;
using Landmark.OLA.Models.Decisioning;
using Landmark.OLA.Models.Decisioning.Enums;
using Landmark.OLA.Models.Loan.Enums;


namespace Landmark.OLA.Application.Controllers
{
    [Route("api/LoanApplication/{loanApplicationId}/DecisioningDetails")]
    [ApiController]
    public class DecisioningController : ControllerBase
    {
        private readonly ICrifVendorClient VendorClient;
        private readonly ILoanApplicationDataAccess LoanApplicationStorage;

        public DecisioningController(
            ICrifVendorClient vendorClient,
            ILoanApplicationDataAccess loanApplicationDataAccess)
        {
            VendorClient = vendorClient;
            LoanApplicationStorage = loanApplicationDataAccess;
        }

        /// <summary>
        /// Use to start decisioning on a loan
        /// </summary>
        /// <remarks>
        /// Returns status of decision start, on 202 you can begin requesting details.
        /// Cookies: Will expire existing cookies.
        /// Security: None required or provided.
        /// </remarks>       
        // PUT: api/Application/{loanApplicationId}/DecisioningDetails
        [HttpPut]
        [ProducesResponseType(202)]
        [ProducesResponseType(400)]
        [ProducesResponseType(500)]
        public async Task<IActionResult> Put(string loanApplicationId, [FromBody] DecisioningDetails decisioningDetails)
        {
            if (decisioningDetails.DecisioningState != DecisioningState.Requested)
            {
                Log.Error("DecisioningState was not set to Requested.");
                return BadRequest("Must PUT a DecisioningState of Requested.");
            }

            Log.Information($"Sending loan {loanApplicationId} to decisioning.");
            try
            {
                var decisioningRequestSuccess = await VendorClient.SendToDecisioning(loanApplicationId);

                if (decisioningRequestSuccess)
                {
                    CookieService.ExpireCookies(HttpContext);
                    return new AcceptedResult();
                }
                else
                {
                    // SendToDecisioning did not succeed, "That's an error. That's all we know.", Check the server logs!
                    Log.Error($"Loan #{loanApplicationId} could not be submitted to decisioning.");
                    return StatusCode((int) System.Net.HttpStatusCode.InternalServerError);
                }
            }
            catch (TimeoutException te)
            {
                Log.Error(te.Message);
                return BadRequest(
                    "The time taken to submit the loan application to the vendor has exceeded the configured timeout length.");
            }
            catch (InvalidOperationException ioe)
            {
                Log.Error(ioe.Message);
                return BadRequest(ioe.Message);
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                return StatusCode((int) HttpStatusCode.InternalServerError);
            }
        }

        /// <summary>
        /// Use to get details of a decision
        /// </summary>
        /// <remarks>
        /// Returns a decision status, which may be empty if the decision is not ready.
        /// Cookies: None required or set.
        /// Security: None required or provided.
        /// </remarks>       
        // GET: api/Application/{loanApplicationId}/DecisioningDetails
        [HttpGet]
        [ProducesResponseType(typeof(DecisioningDetails), 200)]
        [ProducesResponseType(400)]
        [ProducesResponseType(500)]
        public async Task<IActionResult> Get(string loanApplicationId)
        {
            try
            {
                var decisioningResult = await VendorClient.GetDecisionStatus(loanApplicationId);
                if (decisioningResult.DecisioningState == DecisioningState.Ready)
                {
                    var cosmosId = LoanApplicationStorage.GetContainerIdByLoanId(loanApplicationId);
                    LoanApplicationStorage.UpdateStatus(cosmosId, LoanStatus.Decisioned);
                }

                return Ok(decisioningResult);
            }
            catch (TimeoutException te)
            {
                Log.Error(te.Message);
                return BadRequest(
                    "The time taken to decision the loan application has exceeded the configured timeout length.");
            }
            catch (ArgumentException ae)
            {
                Log.Error(ae.Message);
                return BadRequest(ae.Message);
            }
            catch (Error13Exception e13)
            {
                // We will remove these logs on
                Log.Error(e13.Message);
                var decisionResult = new DecisioningDetails()
                {
                    DecisioningState = DecisioningState.Unknown,
                    DecisioningResult = DecisioningResult.ProcessStatus_Incomplete
                };
                return Ok(decisionResult);
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                return StatusCode((int) HttpStatusCode.InternalServerError);
            }
        }
    }
}