package handler

import (
	"database/sql"
	"net/http"
	"strconv"
	"strings"

	"floorvisualizer/internal/repository"
)

func handleArticles(db *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// /articles/{id} — detail
		idStr := strings.TrimPrefix(r.URL.Path, "/articles/")
		if idStr != "" && idStr != r.URL.Path {
			id, err := strconv.Atoi(idStr)
			if err != nil {
				writeJSON(w, 400, map[string]string{"error": "invalid article id"})
				return
			}
			article, err := repository.GetArticleByID(db, id)
			if err != nil {
				writeJSON(w, 404, map[string]string{"error": "article not found"})
				return
			}
			writeJSON(w, 200, article)
			return
		}

		// /articles — list
		page, _ := strconv.Atoi(r.URL.Query().Get("page"))
		limit, _ := strconv.Atoi(r.URL.Query().Get("limit"))

		articles, total, err := repository.ListArticles(db, page, limit)
		if err != nil {
			writeJSON(w, 500, map[string]string{"error": err.Error()})
			return
		}
		effectiveLimit := limit
		if effectiveLimit <= 0 {
			effectiveLimit = 10
		}
		totalPages := 0
		if total > 0 {
			totalPages = (total + effectiveLimit - 1) / effectiveLimit
		}

		writeJSON(w, 200, map[string]interface{}{
			"articles":    articles,
			"total":       total,
			"page":        page,
			"limit":       effectiveLimit,
			"total_pages": totalPages,
		})
	}
}

func handleArticleRecommend(db *sql.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		count := 6
		if c, err := strconv.Atoi(r.URL.Query().Get("count")); err == nil && c > 0 && c <= 20 {
			count = c
		}
		articles, err := repository.RandomArticles(db, count)
		if err != nil {
			writeJSON(w, 500, map[string]string{"error": err.Error()})
			return
		}
		writeJSON(w, 200, map[string]interface{}{
			"articles": articles,
			"total":    len(articles),
		})
	}
}