using System;
using System.Collections.Generic;
using System.Linq;

namespace EmbyToolbox.Models;

/// <summary>Результат детального ffprobe.</summary>
public sealed class MediaAnalysisResult
{
    public string? ContainerFormat { get; init; }
    public string? FormatName { get; init; }
    public long? FormatBitRateBps { get; init; }
    public double? DurationSeconds { get; init; }
    public IReadOnlyList<MediaStreamInfo> VideoStreams { get; init; } = Array.Empty<MediaStreamInfo>();
    public IReadOnlyList<MediaStreamInfo> AudioStreams { get; init; } = Array.Empty<MediaStreamInfo>();
    public IReadOnlyList<MediaStreamInfo> SubtitleStreams { get; init; } = Array.Empty<MediaStreamInfo>();
    public IReadOnlyList<MediaStreamInfo> DataStreams { get; init; } = Array.Empty<MediaStreamInfo>();
    public IReadOnlyList<MediaStreamInfo> AllStreams { get; init; } = Array.Empty<MediaStreamInfo>();
    public long? SourceVideoBitrateBps { get; init; }

    /// <summary>Основной видеопоток: default среди обычных video, затем самый крупный по площади кадра.</summary>
    public MediaStreamInfo? PrimaryVideo =>
        VideoStreams
            .Where(static v => !v.IsAttachedPicture)
            .OrderByDescending(static v => v.IsDefault ? 1 : 0)
            .ThenByDescending(static v => ((long)(v.Width ?? 0)) * (v.Height ?? 0))
            .FirstOrDefault();

    /// <summary>format.duration, иначе максимум duration среди streams (ffprobe).</summary>
    public double? GetEffectiveDurationSeconds()
    {
        if (DurationSeconds is { } f && f > 0)
        {
            return f;
        }

        double? best = null;
        foreach (var s in AllStreams)
        {
            if (s.DurationSeconds is { } d && d > 0)
            {
                best = best is { } b ? Math.Max(b, d) : d;
            }
        }

        return best;
    }
}