using Common;
using Common.Constant;
using Common.Http;
using Esim.Apis.Singleton;
using Database.Database;
using log4net;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;

namespace Esim.Apis.Business
{
    public class ArticleBusinessImpl : IArticleBusiness
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(
            typeof(ArticleBusinessImpl)
        );

        private ModelContext dbContext;
        IConfiguration configuration;

        public ArticleBusinessImpl(ModelContext _dbContext, IConfiguration _configuration)
        {
            dbContext = _dbContext;
            configuration = _configuration;
        }

        private string GetParameter(string key)
        {
            return configuration.GetSection(key).Value ?? "";
        }


        /// <summary>
        /// Load article categories with pagination
        /// </summary>
        public async Task<IActionResult> ArticleCategory(HttpRequest httpRequest, ArticleCategoryReq request)
        {
            var url = httpRequest.Path;
            var json = JsonConvert.SerializeObject(request);
            log.Debug("URL: " + url + " => Request: " + json);
            try
            {
                string lang = (request.lang ?? "lo").ToLower();
                int pageNumber = request.pageNumber < 0 ? 0 : request.pageNumber;
                int pageSize = request.pageSize <= 0 ? 10 : request.pageSize;

                // Query categories
                var query = dbContext.ArticleCategories
                    .Where(c => c.Status == true);

                // Filter by parent category
                if (request.parentId.HasValue)
                {
                    query = query.Where(c => c.ParentId == request.parentId);
                }
                else
                {
                    query = query.Where(c => c.ParentId == null); // Root categories
                }

                // Get total count for pagination
                int totalCount = query.Count();
                int totalPages = (int)Math.Ceiling((double)totalCount / pageSize);

                // Apply pagination and ordering
                var categories = query
                    .OrderBy(c => c.DisplayOrder)
                    .ThenBy(c => c.Id)
                    .Skip(pageNumber * pageSize)
                    .Take(pageSize)
                    .Select(c => new
                    {
                        c.Id,
                        categoryName = lang == "en"
                            ? (c.CategoryNameEn ?? c.CategoryName)
                            : (c.CategoryNameLo ?? c.CategoryName),
                        c.CategorySlug,
                        description = lang == "en"
                            ? (c.DescriptionEn ?? c.Description)
                            : (c.DescriptionLo ?? c.Description),
                        c.IconUrl,
                        c.ParentId,
                        c.DisplayOrder
                    })
                    .ToList();

                return DotnetLib.Http.HttpResponse.BuildResponse(
                    log,
                    url,
                    json,
                    CommonErrorCode.Success,
                    ConfigManager.Instance.GetConfigWebValue("LOAD_SUCCESS", lang),
                    new
                    {
                        items = categories,
                        pagination = new
                        {
                            pageNumber,
                            pageSize,
                            totalCount,
                            totalPages
                        }
                    }
                );
            }
            catch (Exception exception)
            {
                log.Error("Exception: ", exception);
            }
            return DotnetLib.Http.HttpResponse.BuildResponse(
                log,
                url,
                json,
                CommonErrorCode.SystemError,
                ConfigManager.Instance.GetConfigWebValue("SYSTEM_FAILURE"),
                new { }
            );
        }

        /// <summary>
        /// Load articles with pagination and filters
        /// </summary>
        public async Task<IActionResult> ArticleLoad(HttpRequest httpRequest, ArticleLoadReq request)
        {
            var url = httpRequest.Path;
            var json = JsonConvert.SerializeObject(request);
            log.Debug("URL: " + url + " => Request: " + json);
            try
            {
                string lang = (request.lang ?? "lo").ToLower();
                int pageNumber = request.pageNumber < 0 ? 0 : request.pageNumber;
                int pageSize = request.pageSize <= 0 ? 10 : request.pageSize;

                // If slug is provided, return single article detail
                if (!string.IsNullOrEmpty(request.slug))
                {
                    var article = dbContext.Articles
                        .Where(a => a.Slug == request.slug && a.Status == true)
                        .Select(a => new
                        {
                            a.Id,
                            title = lang == "en"
                                ? (a.TitleEn ?? a.Title)
                                : (a.TitleLo ?? a.Title),
                            a.Slug,
                            summary = lang == "en"
                                ? (a.SummaryEn ?? a.Summary)
                                : (a.SummaryLo ?? a.Summary),
                            content = lang == "en"
                                ? (a.ContentEn ?? a.Content)
                                : (a.ContentLo ?? a.Content),
                            a.ThumbnailUrl,
                            a.CoverImageUrl,
                            metaDescription = lang == "en"
                                ? (a.MetaDescriptionEn ?? a.MetaDescription)
                                : (a.MetaDescriptionLo ?? a.MetaDescription),
                            a.MetaKeywords,
                            a.CategoryId,
                            a.ViewCount,
                            a.IsFeatured,
                            a.PublishedDate,
                            a.CreatedDate
                        })
                        .FirstOrDefault();

                    if (article == null)
                    {
                        return DotnetLib.Http.HttpResponse.BuildResponse(
                            log,
                            url,
                            json,
                            CommonErrorCode.Error,
                            ConfigManager.Instance.GetConfigWebValue("ARTICLE_NOT_FOUND", lang),
                            new { }
                        );
                    }

                    // Increment view count
                    var articleEntity = dbContext.Articles.FirstOrDefault(a => a.Slug == request.slug);
                    if (articleEntity != null)
                    {
                        articleEntity.ViewCount = (articleEntity.ViewCount ?? 0) + 1;
                        await dbContext.SaveChangesAsync();
                    }

                    return DotnetLib.Http.HttpResponse.BuildResponse(
                        log,
                        url,
                        json,
                        CommonErrorCode.Success,
                        ConfigManager.Instance.GetConfigWebValue("LOAD_SUCCESS", lang),
                        new { article }
                    );
                }

                // Query articles list
                var query = dbContext.Articles
                    .Where(a => a.Status == true);

                // Filter by category
                if (request.categoryId.HasValue)
                {
                    query = query.Where(a => a.CategoryId == request.categoryId);
                }

                // Filter by featured
                if (request.isFeatured.HasValue && request.isFeatured.Value)
                {
                    query = query.Where(a => a.IsFeatured == true);
                }

                // Get total count for pagination
                int totalCount = query.Count();
                int totalPages = (int)Math.Ceiling((double)totalCount / pageSize);

                // Apply pagination and ordering (pinned first, then by published date)
                var articles = query
                    .OrderByDescending(a => a.IsPinned)
                    .ThenByDescending(a => a.PublishedDate)
                    .ThenByDescending(a => a.CreatedDate)
                    .Skip(pageNumber * pageSize)
                    .Take(pageSize)
                    .Select(a => new
                    {
                        a.Id,
                        title = lang == "en"
                            ? (a.TitleEn ?? a.Title)
                            : (a.TitleLo ?? a.Title),
                        a.Slug,
                        summary = lang == "en"
                            ? (a.SummaryEn ?? a.Summary)
                            : (a.SummaryLo ?? a.Summary),
                        a.ThumbnailUrl,
                        a.CategoryId,
                        a.ViewCount,
                        a.IsFeatured,
                        a.IsPinned,
                        a.PublishedDate
                    })
                    .ToList();

                return DotnetLib.Http.HttpResponse.BuildResponse(
                    log,
                    url,
                    json,
                    CommonErrorCode.Success,
                    ConfigManager.Instance.GetConfigWebValue("LOAD_SUCCESS", lang),
                    new
                    {
                        items = articles,
                        pagination = new
                        {
                            pageNumber,
                            pageSize,
                            totalCount,
                            totalPages
                        }
                    }
                );
            }
            catch (Exception exception)
            {
                log.Error("Exception: ", exception);
            }
            return DotnetLib.Http.HttpResponse.BuildResponse(
                log,
                url,
                json,
                CommonErrorCode.SystemError,
                ConfigManager.Instance.GetConfigWebValue("SYSTEM_FAILURE"),
                new { }
            );
        }

    }
}