using MeetingAssistant.Transcription;
using MeetingAssistant.MeetingNotes;

namespace MeetingAssistant.Recording;

public interface ITranscriptStore
{
    Task<TranscriptSession> CreateSessionAsync(CancellationToken cancellationToken);

    Task<TranscriptSession> CreateSessionAsync(
        MeetingAssistantOptions options,
        DateTimeOffset startedAt,
        CancellationToken cancellationToken);

    Task AppendAsync(TranscriptSession session, TranscriptionSegment segment, CancellationToken cancellationToken)
    {
        return AppendLineAndDiscardReferenceAsync(
            session,
            TranscriptLineFormatter.Format(segment).Line,
            cancellationToken);
    }

    private async Task AppendLineAndDiscardReferenceAsync(
        TranscriptSession session,
        string line,
        CancellationToken cancellationToken)
    {
        _ = await AppendLineAsync(session, line, cancellationToken);
    }

    Task<TranscriptLineReference> AppendLineAsync(
        TranscriptSession session,
        string line,
        CancellationToken cancellationToken);

    Task ReplaceLineAsync(
        TranscriptSession session,
        TranscriptLineReference lineReference,
        string replacementLine,
        CancellationToken cancellationToken);

    Task ReplaceAsync(
        TranscriptSession session,
        IReadOnlyList<TranscriptionSegment> replacementSegments,
        CancellationToken cancellationToken)
    {
        return ReplaceLinesAsync(
            session,
            replacementSegments.Select(segment => TranscriptLineFormatter.Format(segment).Line).ToList(),
            cancellationToken);
    }

    Task ReplaceLinesAsync(
        TranscriptSession session,
        IReadOnlyList<string> replacementLines,
        CancellationToken cancellationToken);

    Task UpdateMetadataAsync(
        TranscriptSession session,
        MeetingSessionArtifacts artifacts,
        MeetingNote meetingNote,
        CancellationToken cancellationToken);
}

public sealed record TranscriptSession(string TranscriptPath);

public sealed record TranscriptLineReference(string TranscriptPath, int BodyLineIndex, string OriginalLine);

public static class TranscriptLineFormatter
{
    public static FormattedTranscriptLine Format(TranscriptionSegment segment)
    {
        var speaker = NormalizeSpeaker(segment.Speaker);
        if (segment.Kind == TranscriptionSegmentKind.Marker)
        {
            return new FormattedTranscriptLine(segment.Text, speaker);
        }

        return new FormattedTranscriptLine(
            $"[{segment.Start:hh\\:mm\\:ss}] {speaker}: {segment.Text}",
            speaker);
    }

    public static string FormatSegmentLine(TranscriptionSegment segment)
    {
        return Format(segment).Line;
    }

    public static string NormalizeSpeaker(string? speaker)
    {
        return string.IsNullOrWhiteSpace(speaker) ? "Unknown" : speaker;
    }
}

public sealed record FormattedTranscriptLine(string Line, string Speaker);