namespace TaxBaik.Application.Tests;

using TaxBaik.Application.DTOs;
using TaxBaik.Application.Services;
using TaxBaik.Domain.Entities;
using TaxBaik.Domain.Interfaces;
using Microsoft.Extensions.Caching.Memory;
using Xunit;

public class BlogServiceTests
{
    [Fact]
    public async Task CreateAsync_WhenPublishedWithoutSeoTitle_ThrowsValidationException()
    {
        var service = new BlogService(new FakeBlogPostRepository(), new MemoryCache(new MemoryCacheOptions()));

        await Assert.ThrowsAsync<ValidationException>(() => service.CreateAsync(new CreateBlogPostDto
        {
            Title = "테스트 포스트",
            Content = "본문",
            SeoDescription = "설명",
            IsPublished = true
        }));
    }

    [Fact]
    public async Task CreateAsync_WhenTitleDuplicates_GeneratesUniqueSlug()
    {
        var repository = new FakeBlogPostRepository
        {
            Posts =
            [
                new BlogPost { Id = 1, Title = "같은 제목", Content = "본문", Slug = "같은-제목" }
            ]
        };
        var service = new BlogService(repository, new MemoryCache(new MemoryCacheOptions()));

        var post = await service.CreateAsync(new CreateBlogPostDto
        {
            Title = "같은 제목",
            Content = "본문"
        });

        Assert.Equal("같은-제목-2", post.Slug);
    }

    private sealed class FakeBlogPostRepository : IBlogPostRepository
    {
        public List<BlogPost> Posts { get; init; } = [];

        public Task<BlogPost?> GetByIdAsync(int id, CancellationToken cancellationToken = default) =>
            Task.FromResult(Posts.FirstOrDefault(x => x.Id == id));

        public Task<BlogPost?> GetBySlugAsync(string slug, CancellationToken cancellationToken = default) =>
            Task.FromResult(Posts.FirstOrDefault(x => x.Slug == slug && x.IsPublished));

        public Task<(IEnumerable<BlogPost> Items, int Total)> GetPublishedPagedAsync(
            int page, int pageSize, int? categoryId = null, CancellationToken cancellationToken = default)
        {
            var items = Posts.Where(x => x.IsPublished).ToList();
            return Task.FromResult<(IEnumerable<BlogPost>, int)>((items, items.Count));
        }

        public Task<IEnumerable<BlogPost>> GetByCategorySlugAsync(string categorySlug, int limit, CancellationToken cancellationToken = default) =>
            Task.FromResult<IEnumerable<BlogPost>>(Posts.Where(x => x.IsPublished).Take(limit).ToList());

        public Task<IEnumerable<BlogPost>> GetAllForAdminAsync(CancellationToken cancellationToken = default) =>
            Task.FromResult<IEnumerable<BlogPost>>(Posts);

        public Task<(IEnumerable<BlogPost> Items, int Total)> GetAdminPagedAsync(
            int page, int pageSize, CancellationToken cancellationToken = default)
        {
            var items = Posts.ToList();
            return Task.FromResult<(IEnumerable<BlogPost>, int)>((items, items.Count));
        }

        public Task<int> CreateAsync(BlogPost post, CancellationToken cancellationToken = default)
        {
            post.Id = Posts.Count + 1;
            Posts.Add(post);
            return Task.FromResult(post.Id);
        }

        public Task UpdateAsync(BlogPost post, CancellationToken cancellationToken = default) => Task.CompletedTask;

        public Task DeleteAsync(int id, CancellationToken cancellationToken = default) => Task.CompletedTask;

        public Task IncrementViewCountAsync(int id, CancellationToken cancellationToken = default) => Task.CompletedTask;
    }
}