using FictionArchive.Service.Shared.Contracts.Events;
using FictionArchive.Service.UserNovelDataService.Models.Database;
using FictionArchive.Service.UserNovelDataService.Services;
using MassTransit;
using Microsoft.EntityFrameworkCore;

namespace FictionArchive.Service.UserNovelDataService.Consumers;

public class ChapterCreatedConsumer : IConsumer<IChapterCreated>
{
    private readonly ILogger<ChapterCreatedConsumer> _logger;
    private readonly UserNovelDataServiceDbContext _dbContext;

    public ChapterCreatedConsumer(
        ILogger<ChapterCreatedConsumer> logger,
        UserNovelDataServiceDbContext dbContext)
    {
        _logger = logger;
        _dbContext = dbContext;
    }

    public async Task Consume(ConsumeContext<IChapterCreated> context)
    {
        var message = context.Message;

        // Ensure novel exists
        var novelExists = await _dbContext.Novels.AnyAsync(n => n.Id == message.NovelId);
        if (!novelExists)
        {
            var novel = new Novel { Id = message.NovelId };
            _dbContext.Novels.Add(novel);
        }

        // Ensure volume exists
        var volumeExists = await _dbContext.Volumes.AnyAsync(v => v.Id == message.VolumeId);
        if (!volumeExists)
        {
            var volume = new Volume { Id = message.VolumeId };
            _dbContext.Volumes.Add(volume);
        }

        // Create chapter if not exists
        var chapterExists = await _dbContext.Chapters.AnyAsync(c => c.Id == message.ChapterId);
        if (chapterExists)
        {
            _logger.LogDebug("Chapter {ChapterId} already exists, skipping", message.ChapterId);
            return;
        }

        var chapter = new Chapter { Id = message.ChapterId };
        _dbContext.Chapters.Add(chapter);
        await _dbContext.SaveChangesAsync();

        _logger.LogInformation("Created chapter stub for {ChapterId} in novel {NovelId}", message.ChapterId, message.NovelId);
    }
}