using ProjectQuint.Core.Charts;

namespace ProjectQuint.Probes;

public readonly record struct ReplayInput(double Time, int Lane, bool Pressed);

public sealed record SyntheticWorkload(PlayableNote[] Notes, ReplayInput[] Events, uint Seed)
{
    public static SyntheticWorkload Create(int noteCount, uint seed)
    {
        if (noteCount < 1 || noteCount > 100_000)
            throw new ArgumentOutOfRangeException(nameof(noteCount), "Use 1 to 100000 notes.");
        var notes = new PlayableNote[noteCount];
        var events = new List<ReplayInput>(noteCount * 2);
        var state = seed;
        for (var index = 0; index < noteCount; index++)
        {
            // Explicit integer PRNG makes the workload independent of System.Random versions.
            state = unchecked(state * 1664525u + 1013904223u);
            var time = 1.0 + index * 0.125;
            var longNote = index % 11 == 0;
            var note = new PlayableNote
            {
                Id = index + 1,
                Lane = index % 4,
                StartTime = time,
                EndTime = time + (longNote ? 0.375 : 0),
            };
            notes[index] = note;
            // Deliberate misses and early releases exercise failure as well as perfect play.
            if (index % 17 == 0)
                continue;
            var pressTime = time + ((int)(state % 7) - 3) * 0.01;
            events.Add(new ReplayInput(pressTime, note.Lane, true));
            events.Add(new ReplayInput(longNote
                ? note.EndTime - (index % 23 == 0 ? 0.2 : 0)
                : pressTime + 0.02, note.Lane, false));
        }
        return new SyntheticWorkload(notes, events.OrderBy(e => e.Time)
            .ThenBy(e => e.Pressed).ThenBy(e => e.Lane).ToArray(), seed);
    }
}