using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Flurl.Http;
using Trash.Extensions;

namespace Trash.Radarr.QualityDefinition
{
    public class RadarrQualityDefinitionGuideParser : IRadarrQualityDefinitionGuideParser
    {
        private readonly Regex _regexHeader = new(@"^#+", RegexOptions.Compiled);

        private readonly Regex _regexTableRow =
            new(@"\| *(.*?) *\| *([\d.]+) *\| *([\d.]+) *\|", RegexOptions.Compiled);

        public async Task<string> GetMarkdownData()
        {
            return await
                "https://raw.githubusercontent.com/TRaSH-/Guides/master/docs/Radarr/V3/Radarr-Quality-Settings-File-Size.md"
                    .GetStringAsync();
        }

        public IDictionary<RadarrQualityDefinitionType, List<RadarrQualityData>> ParseMarkdown(string markdown)
        {
            var results = new Dictionary<RadarrQualityDefinitionType, List<RadarrQualityData>>();
            List<RadarrQualityData>? table = null;

            var reader = new StringReader(markdown);
            for (var line = reader.ReadLine(); line != null; line = reader.ReadLine())
            {
                if (string.IsNullOrEmpty(line))
                {
                    continue;
                }

                var match = _regexHeader.Match(line);
                if (match.Success)
                {
                    // todo: hard-coded for now since there's only one supported right now.
                    var type = RadarrQualityDefinitionType.Movie;
                    table = results.GetOrCreate(type);

                    // If we grab a table that isn't empty, that means for whatever reason *another* table
                    // in the markdown is trying to modify a previous table's data. For example, maybe there
                    // are two "Series" quality tables. That would be a weird edge case, but handle that
                    // here just in case.
                    if (table.Count > 0)
                    {
                        table = null;
                    }
                }
                else if (table != null)
                {
                    match = _regexTableRow.Match(line);
                    if (match.Success)
                    {
                        table.Add(new RadarrQualityData
                        {
                            Name = match.Groups[1].Value,
                            Min = match.Groups[2].Value.ToDecimal(),
                            Max = match.Groups[3].Value.ToDecimal()
                        });
                    }
                }
            }

            return results;
        }
    }
}