using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Microsoft.Extensions.Options;
using MongoDB.Bson;
using MongoDB.Driver;
using Serilog;
using CRIF.ACTion.Configuration;
using CRIF.ACTion.Services.Crif;
using Landmark.OLA.Models.Loan;


namespace Landmark.OLA.Application.DataAccess
{
    public class BranchDataAccess : IDisposable, IBranchDataAccess
    {
        private bool disposed = false;
        private protected readonly CrifSettings _crifSettings;
        private readonly IDataClient _client;
        private readonly ICrifVendorClient _vendorClient;
        private readonly string _collectionName = "Branches";
        private readonly string _branchNameCollectionName = "ServicingChannelToBranchName";
        private readonly List<BranchNameData> _branchNameDataListDefaults = new List<BranchNameData>
                    {
                        new() { ChannelId = 0, BranchName = "Not Found" },
                        new() { ChannelId = 1, BranchName = "ALL" }
                    };

        public BranchDataAccess(
            IDataClient dataClient,
            IOptions<CrifSettings> crifSettings,
            ICrifVendorClient vendorClient)
        {
            _client = dataClient;
            _crifSettings = crifSettings.Value;
            _vendorClient = vendorClient;
        }

        private IMongoCollection<BranchConfig> GetBranchContainersCollection()
        {
            return _client.GetDatabase().GetCollection<BranchConfig>(_collectionName);
        }

        private IMongoCollection<BranchNameConfig> GetBranchNameContainersCollection()
        {
            return _client.GetDatabase().GetCollection<BranchNameConfig>(_branchNameCollectionName);
        }

        public BranchConfig GetBranchConfig()
        {
            try
            {
                var collection = GetBranchContainersCollection();
                var result = collection.Find(new BsonDocument()).ToList().FirstOrDefault();
                return result ?? throw new Exception("Could not find branch mapping");
            }
            catch (MongoConnectionException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Could not load branch config");
            }
        }

        public void CreateBranchConfig(BranchConfig branchConfig)
        {
            try
            {
                var collection = GetBranchContainersCollection();

                if (collection.Find(new BsonDocument()).ToList().Count > 0)
                {
                    throw new Exception("Can only insert 1 branch config");
                }
                collection.InsertOne(branchConfig);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while creating branch config");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while creating branch config");
            }
        }

        public void UpdateBranchConfig(BranchConfig branchConfig)
        {
            try
            {
                var collection = GetBranchContainersCollection();

                ReplaceOneResult result = collection.ReplaceOne(eachLoan => eachLoan.Id == branchConfig.Id, branchConfig);
                if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                {
                    throw new KeyNotFoundException("Item not found");
                }
            }
            catch (KeyNotFoundException en)
            {
                Log.Error(en.Message);
                throw new KeyNotFoundException(en.Message);
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while creating updating branch config");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while creating updating branch config");
            }
        }

        public BranchNameConfig GetBranchNameConfig()
        {
            try
            {
                var collection = GetBranchNameContainersCollection();
                var result = collection.Find(new BsonDocument()).ToList().FirstOrDefault();

                if (result == null)
                {
                    UpsertBranchNameConfig();
                }
                else if (result != null && result.BranchNamesByChannelId.Count <= _branchNameDataListDefaults.Count)
                {
                    UpsertBranchNameConfig(true);
                }

                collection = GetBranchNameContainersCollection();
                result = collection.Find(new BsonDocument()).ToList().FirstOrDefault();
                return result;
            }
            catch (MongoConnectionException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Could not load branch name config");
            }
        }

        public void UpsertBranchNameConfig(bool IsUpdate = false)
        {
            try
            {
                var collection = GetBranchNameContainersCollection();

                if (collection.Find(new BsonDocument()).ToList().Count > 0 && !IsUpdate)
                {
                    throw new Exception("Can only insert 1 branch name config");
                }

                SortedList<int, string> configurationDetails = _vendorClient.GetBranchNameConfiguration("getChannels").GetAwaiter().GetResult();
                BranchNameConfig branchNameConfig = new();

                List<BranchNameData> branchNameDataList = CreateBranchNameDataList(configurationDetails);

                branchNameConfig.Id = (Guid.NewGuid()).ToString();
                branchNameConfig.Date = DateTime.Now;
                branchNameConfig.BranchNamesByChannelId = branchNameDataList;

                if (IsUpdate)
                {
                    var oldConfig = collection.Find(new BsonDocument()).ToList().FirstOrDefault();
                    branchNameConfig.Id = oldConfig.Id;
                    ReplaceOneResult result = collection.ReplaceOne(eachConfig => eachConfig.Id == branchNameConfig.Id, branchNameConfig);
                    if (result.MatchedCount == 0 || result.ModifiedCount == 0)
                    {
                        throw new KeyNotFoundException("Item not found");
                    }
                }
                else
                {
                    collection.InsertOne(branchNameConfig);
                }
            }
            catch (MongoException ex)
            {
                Log.Error(ex.Message);
                throw new InvalidDataException("Error occured while creating branch names config");
            }
            catch (Exception e)
            {
                Log.Error(e.Message);
                throw new InvalidDataException("Error occured while creating branch names config");
            }
        }

        public void UpdateBranchNameConfig()
        {
            UpsertBranchNameConfig(true);
        }

        public List<BranchNameData> CreateBranchNameDataList(SortedList<int, string> configurationDetails)
        {
            List<BranchNameData> branchNameDataList = _branchNameDataListDefaults;

            foreach (var branchNameData in configurationDetails)
            {
                try
                {
                    branchNameDataList.Add(new BranchNameData { ChannelId = branchNameData.Key, BranchName = branchNameData.Value });
                }
                catch (Exception ex)
                {
                    Log.Error(ex.Message);
                }
            }
            return branchNameDataList;
        }

        #region IDisposable

        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                }
            }

            this.disposed = true;
        }

        public int GetDistributionChannelByZipCode(string zipCode)
        {
            var config = GetBranchConfig();
            foreach (var eachBranch in config.BranchCodesByZip)
            {
                if (eachBranch.Zipcode == zipCode)
                {
                    return eachBranch.ChannelId;
                }
            }
            return _crifSettings.ServicingChannels.DefaultServicingChannel;
        }

        #endregion
    }
}