using System.Text.Json.Serialization;

namespace Shared.Models.Templates
{
    public struct SegmentTpl
    {
        public List<SegmentDto> ads { get; private set; }

        public List<SegmentDto> skips { get; private set; }

        public SegmentTpl()
        {
            ads = new List<SegmentDto>(5);
            skips = new List<SegmentDto>(5);
        }

        public bool IsEmpty => ads.Count == 0 && skips.Count == 0;

        public void ad(int start, int end)
        {
            if (start >= 0 && end >= 0 && end >= start)
                ads.Add(new SegmentDto(start == 0 ? 1 : start, end));
        }

        public void skip(int start, int end)
        {
            if (start >= 0 && end >= 0 && end >= start)
                skips.Add(new SegmentDto(start == 0 ? 1 : start, end));
        }

        public Dictionary<string, IReadOnlyList<SegmentDto>> ToObject()
        {
            if (IsEmpty)
                return null;

            return new Dictionary<string, IReadOnlyList<SegmentDto>>() 
            {
                ["ad"] = ads,
                ["skip"] = skips
            };
        }
    }

    public readonly struct SegmentDto
    {
        public int start { get; }
        public int end { get; }

        [JsonConstructor]
        public SegmentDto(int start, int end)
        {
            this.start = start;
            this.end = end;
        }
    }
}