using MeetingAssistant.MeetingNotes;

namespace MeetingAssistant.Recording;

internal static class MeetingArtifactContentDetector
{
    private static readonly string[] DefaultAssistantContextLines =
    [
        "# Assistant Context",
        "## Live Context"
    ];

    public static async Task<bool> IsDefaultOnlyAsync(
        MeetingSessionArtifacts artifacts,
        CancellationToken cancellationToken)
    {
        if (!File.Exists(artifacts.MeetingNotePath) ||
            !File.Exists(artifacts.TranscriptPath) ||
            !File.Exists(artifacts.AssistantContextPath))
        {
            return false;
        }

        var meetingNote = await File.ReadAllTextAsync(artifacts.MeetingNotePath, cancellationToken);
        var transcript = await File.ReadAllTextAsync(artifacts.TranscriptPath, cancellationToken);
        var assistantContext = await File.ReadAllTextAsync(artifacts.AssistantContextPath, cancellationToken);

        return IsDefaultOnlyMeetingNote(meetingNote) &&
            IsDefaultOnlyTranscript(transcript) &&
            IsDefaultOnlyAssistantContext(assistantContext);
    }

    private static bool IsDefaultOnlyMeetingNote(string content)
    {
        return string.IsNullOrWhiteSpace(MarkdownDocumentParser.SplitOptional(content).Body);
    }

    private static bool IsDefaultOnlyTranscript(string content)
    {
        var body = MarkdownDocumentParser.SplitOptional(content).Body;
        return GetMeaningfulLines(body)
            .All(line => string.Equals(line, "# Meeting Transcript", StringComparison.OrdinalIgnoreCase));
    }

    private static bool IsDefaultOnlyAssistantContext(string content)
    {
        var body = MarkdownDocumentParser.SplitOptional(content).Body;
        return GetMeaningfulLines(body)
            .All(line => DefaultAssistantContextLines.Contains(line, StringComparer.OrdinalIgnoreCase));
    }

    private static IEnumerable<string> GetMeaningfulLines(string body)
    {
        return body
            .Split(["\r\n", "\n"], StringSplitOptions.None)
            .Select(line => line.Trim())
            .Where(line => !string.IsNullOrWhiteSpace(line));
    }
}