#nullable enable
using Baya.Application.Contracts.Reviews;
using Microsoft.Extensions.Options;

namespace Baya.Infrastructure.CrossCutting.Seams;

/// <summary>
/// Deterministic mock <see cref="IReviewModerationService"/> (b14) — a keyword filter / pass-through with no
/// external call. A banned-word hit → <see cref="ModerationDecision.Reject"/>; otherwise clean text → a
/// human-review <see cref="ModerationDecision.Flag"/> by default (so the publish gate holds), or
/// <see cref="ModerationDecision.Approve"/> when <see cref="ReviewModerationOptions.AutoApproveClean"/> is set.
/// The real text classifier / LLM endpoint swaps in by a registration change only — the moderation command
/// keeps decision authority and the human override, so it never touches the handler.
/// </summary>
public sealed class MockReviewModerationService(IOptions<SeamOptions> options) : IReviewModerationService
{
    private readonly ReviewModerationOptions _options = options.Value.ReviewModeration;

    public ValueTask<ModerationVerdict> ScreenAsync(string? reviewText, CancellationToken cancellationToken = default)
    {
        var text = reviewText?.Trim() ?? string.Empty;

        var hit = _options.BannedWords.FirstOrDefault(
            w => !string.IsNullOrWhiteSpace(w) && text.Contains(w, StringComparison.OrdinalIgnoreCase));
        if (hit is not null)
            return ValueTask.FromResult(new ModerationVerdict(ModerationDecision.Reject, $"banned_word:{hit}"));

        var decision = _options.AutoApproveClean ? ModerationDecision.Approve : ModerationDecision.Flag;
        return ValueTask.FromResult(new ModerationVerdict(decision, "clean"));
    }
}