using System.Text.Json;

namespace Fitness_core_BE.Helpers
{
    public record EquipmentCount(string Name, int Count);

    public class GymFacilitiesData
    {
        public bool HasAc { get; set; }
        public List<EquipmentCount> Equipment { get; set; } = new();
    }

    public static class GymFacilities
    {
        private static readonly JsonSerializerOptions Opts = new(JsonSerializerDefaults.Web);

        public static GymFacilitiesData Parse(string? facilities)
        {
            if (string.IsNullOrWhiteSpace(facilities)) return new GymFacilitiesData();
            try
            {
                return JsonSerializer.Deserialize<GymFacilitiesData>(facilities, Opts) ?? new GymFacilitiesData();
            }
            catch (JsonException)
            {
                // Older records may hold plain-text facilities — treat as no structured data.
                return new GymFacilitiesData();
            }
        }

        public static string Serialize(bool hasAc, IEnumerable<EquipmentCount>? equipment)
        {
            var data = new GymFacilitiesData
            {
                HasAc = hasAc,
                Equipment = (equipment ?? Enumerable.Empty<EquipmentCount>())
                    .Where(e => !string.IsNullOrWhiteSpace(e.Name))
                    .GroupBy(e => e.Name.Trim(), StringComparer.OrdinalIgnoreCase)
                    .Select(group => new EquipmentCount(
                        group.First().Name.Trim(),
                        (int)Math.Min(
                            group.Sum(item => Math.Max(0L, item.Count)),
                            int.MaxValue)))
                    .ToList()
            };
            return JsonSerializer.Serialize(data, Opts);
        }
    }
}