using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls.Primitives;
using System.Windows;
using Txt2Bib.Records;
using System.ComponentModel.DataAnnotations;

namespace Txt2Bib
{
    internal class Text2Bib
    {
        private readonly Dictionary<string, string> _citTypes = new()
        {
            { "J" , "article"},
            { "B", "book" },
            { "P", "conference" },
            { "C" , "inbook" }
        };
        /// <summary>
        /// Generate single .bib file from input text files
        /// </summary>
        /// <param name="filenames"></param>
        /// <returns></returns>
        public string Generate(string filenames)
        {
            var paths = filenames.Trim().Split('\n');
            string result = "";
            string output = "";

            foreach (var path in paths)
            {
                var reader = File.OpenText(path);
                byte[] contentBytes = File.ReadAllBytes(path);

                result += Encoding.Latin1.GetString(contentBytes);
            }

            var entries = result.Split('%').ToList<string>().Select(entry =>
            {
                return Process(entry);
            });

            foreach (var entry in entries)
            {
                output += entries;
            }

            return output;
        }

        private IBib Process(string entryFromTxt)
        {
            return new ArticleBib();
        }

        /// <summary>
        /// TODO: How to determine correct encoding of text file??
        /// </summary>
        /// <param name="reader">The stream reader for the file</param>
        /// <returns></returns>
        private Encoding GuessEncoding(StreamReader reader)
        {
            var cp = "UTF-8";
            return Encoding.GetEncoding(cp);

        }
    }
}