using System;
using System.Collections.Generic;
using System.Linq;
using StreamPlayer.Desktop.Models;

namespace StreamPlayer.Desktop.Services;

public static class SectionBuilder
{
    public static IReadOnlyList<ChannelSection> BuildSections()
    {
        var sections = new List<ChannelSection>
        {
            new("Eventos en vivo", SectionType.Events, Array.Empty<StreamChannel>())
        };

        var grouped = ChannelRepository.GetChannels()
            .GroupBy(channel => DeriveGroupName(channel.Name))
            .ToDictionary(group => group.Key, group => (IReadOnlyList<StreamChannel>)group.ToList());

        if (grouped.TryGetValue("ESPN", out var espnGroup))
        {
            sections.Add(new ChannelSection("ESPN", SectionType.Channels, espnGroup));
            grouped.Remove("ESPN");
        }

        foreach (var key in grouped.Keys.OrderBy(k => k, StringComparer.OrdinalIgnoreCase))
        {
            var channels = grouped[key];
            if (channels.Count == 0)
            {
                continue;
            }
            sections.Add(new ChannelSection(key, SectionType.Channels, channels));
        }

        sections.Add(new ChannelSection("Todos los canales", SectionType.Channels, ChannelRepository.GetChannels()));
        return sections;
    }

    private static string DeriveGroupName(string name)
    {
        if (string.IsNullOrWhiteSpace(name))
        {
            return "General";
        }
        string upper = name.ToUpperInvariant();
        if (upper.StartsWith("ESPN", StringComparison.Ordinal))
        {
            return "ESPN";
        }
        if (upper.Contains("FOX SPORTS", StringComparison.Ordinal))
        {
            return "Fox Sports";
        }
        if (upper.Contains("FOX", StringComparison.Ordinal))
        {
            return "Fox";
        }
        if (upper.Contains("TNT", StringComparison.Ordinal))
        {
            return "TNT";
        }
        if (upper.Contains("DAZN", StringComparison.Ordinal))
        {
            return "DAZN";
        }
        if (upper.Contains("TUDN", StringComparison.Ordinal))
        {
            return "TUDN";
        }
        if (upper.Contains("TYC", StringComparison.Ordinal))
        {
            return "TyC";
        }
        if (upper.Contains("GOL", StringComparison.Ordinal))
        {
            return "Gol";
        }
        int spaceIndex = upper.IndexOf(' ');
        return spaceIndex > 0 ? upper[..spaceIndex] : upper;
    }
}