package handler

import (
	"database/sql"
	"errors"

	"git.dmitriygnatenko.ru/dima/go-common/logger"
	"github.com/gofiber/fiber/v2"

	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/mapper"
	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/services/i18n"
)

const (
	ArticleCacheKey  = "article"
	maxArticlesCount = 3
	articleParam     = "article"
)

func ArticleHandler(
	cacheService CacheService,
	articleRepository ArticleRepository,
	tagRepository TagRepository,
) fiber.Handler {
	return func(fctx *fiber.Ctx) error {
		ctx := fctx.Context()
		url := fctx.Params(articleParam)
		lang := i18n.Language(fctx)

		renderData, found := cacheService.Get(ArticleCacheKey + string(lang) + url)

		if !found {
			article, err := articleRepository.GetByURL(ctx, url)
			if err != nil {
				if errors.Is(err, sql.ErrNoRows) {
					return fiber.ErrNotFound
				}

				logger.Error(ctx, err.Error())

				return err
			}

			if !article.IsActive {
				return fiber.ErrNotFound
			}

			articleDTO := mapper.ToArticleDTO(fctx, *article)

			// All used tags
			tags, err := tagRepository.GetAllUsed(ctx)
			if err != nil {
				logger.Error(ctx, err.Error())
				return err
			}

			tagsDTO := mapper.ToTagDTOList(tags)

			// Last articles
			articles, err := articleRepository.GetAllPreview(ctx)
			if err != nil {
				logger.Error(ctx, err.Error())
				return err
			}
			if len(articles) > maxArticlesCount {
				articles = articles[:maxArticlesCount]
			}

			renderData = fiber.Map{
				"headTitle":       i18n.T(lang, "head_title"),
				"headDescription": articleDTO.MetaDescription,
				"headKeywords":    articleDTO.MetaKeywords,
				"pageTitle":       i18n.T(lang, "article_page_title", articleDTO.Title),
				"article":         articleDTO,
				"sidebarArticles": mapper.ToArticlePreviewDTOList(fctx, articles),
				"sidebarTags":     tagsDTO,
			}

			cacheService.Set(ArticleCacheKey+string(lang)+url, renderData, nil)
		}

		return fctx.Render("article", renderData, "_layout")
	}
}