using System.IO;
using System.Text.RegularExpressions;
using ComplianceNFs.Core.Entities;
using ComplianceNFs.Core.Ports;

namespace ComplianceNFs.Infrastructure.Parsers
{
    public class PdfParser : IPdfParser
    {
        private readonly Regex CnpjCompRegex = GeneratedRegex("CNPJComp: (\\d{14})");
        private readonly Regex CnpjVendRegex = GeneratedRegex("CNPJVend: (\\d{14})");
        private readonly Regex MontNFRegex = GeneratedRegex("MontNF: ([\\d,.]+)");
        private readonly Regex PrecNFRegex = GeneratedRegex("PrecNF: ([\\d,.]+)");

        public ParsedInvoice Parse(Stream pdfStream)
        {
            // Minimal demo: just read bytes as text (replace with real PDF parsing in production)
            using var ms = new MemoryStream();
            pdfStream.CopyTo(ms);
            var text = System.Text.Encoding.UTF8.GetString(ms.ToArray());
            // Example: extract CNPJ and values using regex (replace with real patterns)
            var cnpjComp = CnpjCompRegex.Match(text).Groups[1].Value;
            var cnpjVend = CnpjVendRegex.Match(text).Groups[1].Value;
            var montNF = decimal.TryParse(MontNFRegex.Match(text).Groups[1].Value, out var m) ? m : 0;
            var precNF = decimal.TryParse(PrecNFRegex.Match(text).Groups[1].Value, out var p) ? p : 0;
            return new ParsedInvoice
            {
                CnpjComp = cnpjComp,
                CnpjVend = cnpjVend,
                MontNF = montNF,
                PrecNF = precNF
                // ...fill other fields as needed
            };

        }

        public static Regex GeneratedRegex(string pattern)
        {
            return new Regex(pattern);
        }
    }
}