package routes

import (
	"bssapp-backend/models"
	"bssapp-backend/queries"
	"database/sql"
	"encoding/json"
	"log"
	"net/http"
)

// ======================================================
// 📌 UserListRoute — Kullanıcı Listeleme API (FINAL)
// ======================================================
func UserListRoute(pg *sql.DB) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

		w.Header().Set("Content-Type", "application/json; charset=utf-8")

		// --------------------------------------------------
		// 🔍 Query Param
		// --------------------------------------------------
		search := r.URL.Query().Get("search")
		log.Printf("📥 /api/users/list çağrıldı | search='%s'", search)

		// --------------------------------------------------
		// 🗄️ SQL CALL
		// --------------------------------------------------
		rows, err := queries.GetUserList(pg, search)
		if err != nil {
			log.Printf("❌ SQL sorgu hatası (GetUserList): %v", err)
			http.Error(w, "Veritabanı hatası", http.StatusInternalServerError)
			return
		}
		defer rows.Close()

		// --------------------------------------------------
		// 📦 Sonuç Listesi
		// --------------------------------------------------
		list := make([]models.UserListRow, 0, 100)
		count := 0

		// ==================================================
		// 🧠 SCAN — SQL SELECT ile BİRE BİR (8 kolon)
		// ==================================================
		for rows.Next() {

			var u models.UserListRow

			err = rows.Scan(
				&u.ID,              // 1
				&u.Code,            // 2
				&u.IsActive,        // 3
				&u.NebimUsername,   // 4 (nullable)
				&u.UserGroupCode,   // 5 (nullable)
				&u.RoleNames,       // 6
				&u.DepartmentNames, // 7
				&u.PiyasaNames,     // 8
			)

			if err != nil {
				log.Printf("⚠️ Satır atlandı (SCAN hatası): %v", err)
				continue
			}

			list = append(list, u)
			count++
		}

		if err := rows.Err(); err != nil {
			log.Printf("⚠️ rows.Err(): %v", err)
		}

		log.Printf("✅ User listesi tamamlandı — %d kayıt gönderildi.", count)

		// --------------------------------------------------
		// 📤 JSON OUTPUT
		// --------------------------------------------------
		_ = json.NewEncoder(w).Encode(list)
	})
}