namespace FrontOffice.Main.Utilities;

/// <summary>
/// Service for fetching published blog posts (customer-facing).
/// Used by Landing Page (latest posts) and future Blog pages.
/// </summary>
public class BlogPostService
{
    private readonly CMSMicroservice.Protobuf.Protos.BlogPost.BlogPostContract.BlogPostContractClient _client;

    public BlogPostService(CMSMicroservice.Protobuf.Protos.BlogPost.BlogPostContract.BlogPostContractClient client)
    {
        _client = client;
    }

    /// <summary>
    /// Get featured blog posts (for landing page hero / highlights).
    /// </summary>
    public async Task<List<BlogPostCardDto>> GetFeaturedPostsAsync(int count = 3)
    {
        try
        {
            var response = await _client.GetFeaturedBlogPostsAsync(
                new CMSMicroservice.Protobuf.Protos.BlogPost.GetFeaturedBlogPostsRequest { Count = count });

            return MapToCardDtos(response?.Models);
        }
        catch (Exception ex)
        {
#if DEBUG
            Console.WriteLine($"BlogPostService.GetFeaturedPostsAsync error: {ex.Message}");
#endif
            return new();
        }
    }

    /// <summary>
    /// Get latest published posts with optional category filter.
    /// </summary>
    public async Task<BlogPostListResult> GetPublishedPostsAsync(int page = 1, int pageSize = 9, string? search = null, long? categoryId = null)
    {
        try
        {
            var request = new CMSMicroservice.Protobuf.Protos.BlogPost.GetPublishedBlogPostsRequest
            {
                PaginationState = new CMSMicroservice.Protobuf.Protos.PaginationState
                {
                    PageNumber = page,
                    PageSize = pageSize
                }
            };

            if (!string.IsNullOrWhiteSpace(search))
                request.SearchTerm = search;
            if (categoryId.HasValue)
                request.CategoryId = categoryId.Value;

            var response = await _client.GetPublishedBlogPostsAsync(request);

            return new BlogPostListResult
            {
                Posts = MapToCardDtos(response?.Models),
                TotalCount = (int)(response?.MetaData?.TotalCount ?? 0),
                TotalPages = (int)(response?.MetaData?.TotalPage ?? 0),
                CurrentPage = page
            };
        }
        catch (Exception ex)
        {
#if DEBUG
            Console.WriteLine($"BlogPostService.GetPublishedPostsAsync error: {ex.Message}");
#endif
            return new();
        }
    }

    /// <summary>
    /// Get a single blog post by slug (for blog detail page).
    /// </summary>
    public async Task<BlogPostDetailDto?> GetBySlugAsync(string slug)
    {
        try
        {
            var response = await _client.GetBlogPostBySlugAsync(
                new CMSMicroservice.Protobuf.Protos.BlogPost.GetBlogPostBySlugRequest { Slug = slug });

            if (response == null || response.Id <= 0) return null;

            return new BlogPostDetailDto
            {
                Id = response.Id,
                Title = response.Title,
                Slug = response.Slug,
                Summary = response.Summary,
                HtmlContent = response.HtmlContent,
                FeaturedImagePath = response.FeaturedImagePath,
                FeaturedImageThumbnailPath = response.FeaturedImageThumbnailPath,
                PublishedAt = response.PublishedAt?.ToDateTime(),
                ViewCount = response.ViewCount,
                IsFeatured = response.IsFeatured,
                Categories = response.Categories?.Select(c => new BlogCategoryInfo { Id = c.Id, Title = c.Title, Slug = c.Slug }).ToList() ?? new(),
                Tags = response.Tags?.Select(t => new BlogTagInfo { Id = t.Id, Title = t.Title, Name = t.Name }).ToList() ?? new()
            };
        }
        catch (Exception ex)
        {
#if DEBUG
            Console.WriteLine($"BlogPostService.GetBySlugAsync error: {ex.Message}");
#endif
            return null;
        }
    }

    /// <summary>
    /// Increment view count for a blog post.
    /// </summary>
    public async Task IncrementViewCountAsync(long postId)
    {
        try
        {
            await _client.IncrementViewCountAsync(
                new CMSMicroservice.Protobuf.Protos.BlogPost.IncrementViewCountRequest { Id = postId });
        }
        catch
        {
            // Fire and forget — don't fail the page
        }
    }

    // ── Helpers ──

    private static List<BlogPostCardDto> MapToCardDtos(
        Google.Protobuf.Collections.RepeatedField<CMSMicroservice.Protobuf.Protos.BlogPost.BlogPostListItem>? models)
    {
        if (models == null || models.Count == 0) return new();

        return models.Select(m => new BlogPostCardDto
        {
            Id = m.Id,
            Title = m.Title,
            Slug = m.Slug,
            Summary = m.Summary,
            ThumbnailUrl = m.FeaturedImageThumbnailPath,
            PublishedAt = m.PublishedAt?.ToDateTime(),
            ViewCount = m.ViewCount,
            IsFeatured = m.IsFeatured,
            Categories = m.Categories?.Select(c => new BlogCategoryInfo { Id = c.Id, Title = c.Title, Slug = c.Slug }).ToList() ?? new()
        }).ToList();
    }

}

// ── DTOs ──

public class BlogPostCardDto
{
    public long Id { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Slug { get; set; } = string.Empty;
    public string? Summary { get; set; }
    public string? ThumbnailUrl { get; set; }
    public DateTime? PublishedAt { get; set; }
    public int ViewCount { get; set; }
    public bool IsFeatured { get; set; }
    public List<BlogCategoryInfo> Categories { get; set; } = new();
}

public class BlogPostDetailDto
{
    public long Id { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Slug { get; set; } = string.Empty;
    public string? Summary { get; set; }
    public string HtmlContent { get; set; } = string.Empty;
    public string? FeaturedImagePath { get; set; }
    public string? FeaturedImageThumbnailPath { get; set; }
    public DateTime? PublishedAt { get; set; }
    public int ViewCount { get; set; }
    public bool IsFeatured { get; set; }
    public List<BlogCategoryInfo> Categories { get; set; } = new();
    public List<BlogTagInfo> Tags { get; set; } = new();
}

public class BlogPostListResult
{
    public List<BlogPostCardDto> Posts { get; set; } = new();
    public int TotalCount { get; set; }
    public int TotalPages { get; set; }
    public int CurrentPage { get; set; }
}

public class BlogCategoryInfo
{
    public long Id { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Slug { get; set; } = string.Empty;
}

public class BlogTagInfo
{
    public long Id { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Name { get; set; } = string.Empty;
}