using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using LCU.Shared.Collections.RepoApiLib.Models;
using NotVisualBasic.FileIO;
using Serilog;

namespace LCU.API.Collections.RepoApi.Services.AutoIms
{
    public class ImsAutoFileNoteConverter : IImsAutoFileNoteConverter
    {
        public ImsAutoFileNoteConverter()
        {
        }

        public IEnumerable<AuctionAssignmentNote> CsvToImsAutoFileNotes(Stream file)
        {
            List<AuctionAssignmentNote> listOfObjects = new List<AuctionAssignmentNote>();

            using (CsvTextFieldParser tfp = new CsvTextFieldParser(file))
            {
                // Get Some Column Names
                string[] columns = tfp.ReadFields();

                while (!tfp.EndOfData)
                {
                    var fields = tfp.ReadFields();

                    if (!fields[0].Contains("------") && (fields.Any(x => x.Trim().Length > 0)))
                    {
                        var obj = new AuctionAssignmentNote();

                        for (var i = 0; i < fields.Length; i++)
                        {
                            obj = SetFieldByName(obj, columns[i].Trim(), fields[i].Trim());
                        }

                        listOfObjects.Add(obj);
                    }
                }
            }

            return listOfObjects;
        }

        /**
         * Take the rows with only account and discard them, using the account no to update the other rows.
         * Each row in the CSV does not have CustomerAccountNo, only the first row of each set.
         * Further, if a row has a customer account no, it has nothing else.
         */
        public IEnumerable<AuctionAssignmentNote> CompressIdentifyingRows(IEnumerable<AuctionAssignmentNote> csvNotes)
        {
            List<AuctionAssignmentNote> data = new List<AuctionAssignmentNote>();
            string accountNo = String.Empty;

            foreach (var item in csvNotes)
            {
                try
                {
                    if (!string.IsNullOrWhiteSpace(item.AuctionCustomerNo) && item.AuctionCustomerNo != accountNo)
                    {
                        accountNo = item.AuctionCustomerNo;
                        // Skip account rows, unless they start showing up with data.
                        if (string.IsNullOrWhiteSpace(item.Text))
                        {
                            continue;
                        }
                    }

                    if (string.IsNullOrWhiteSpace(accountNo))
                    {
                        Log.Error($"No Account Number when processing notes row, {item.Text}");
                        return null;
                    }

                    item.AuctionCustomerNo = accountNo;
                    data.Add(item);
                }
                catch (Exception ex)
                {
                    Log.Error(ex, $"Error compressing notes for auction accountNo: {accountNo}");
                }
            }

            return data;
        }

        public AuctionAssignmentNote SetFieldByName(AuctionAssignmentNote input, string fieldName, string value)
        {
            try
            {
                switch (fieldName)
                {
                    case "Cn. Acc. #":
                        input.AuctionCustomerNo = value;
                        break;
                    case "Origin":
                        input.Origin = value;
                        break;
                    case "Writer":
                        input.Writer = value;
                        break;
                    case "Type":
                        input.Type = value;
                        break;
                    case "Text":
                        input.Text = value;
                        break;
                    case "Date Written":
                        input.DateWritten = !string.IsNullOrWhiteSpace(value)
                            ? DateTime.Parse(value.Substring(0, value.Trim().Length - 4))
                            : (DateTime?) null;
                        break;

                    default:
                        Log.Error("Got unknown field {fieldName} with value {value} for AuctionAssignmentNote");
                        break;
                }
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Failed to set field {fieldName} with value {value} for AuctionAssignmentNote.");
            }

            return input;
        }
    }
}