package handler

import (
	"encoding/json"
	"log/slog"
	"net/http"

	"github.com/vectordns/server/internal/dns"
)

func DNSLookup(w http.ResponseWriter, r *http.Request) {
	var req dns.LookupRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body", "INVALID_BODY")
		return
	}

	if req.Domain == "" {
		writeError(w, http.StatusBadRequest, "domain is required", "MISSING_DOMAIN")
		return
	}

	resp, err := dns.Lookup(req)
	if err != nil {
		slog.Error("dns lookup failed", "domain", req.Domain, "error", err)
		writeError(w, http.StatusInternalServerError, "dns lookup failed", "LOOKUP_FAILED")
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(resp)
}

func writeError(w http.ResponseWriter, status int, msg, code string) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	json.NewEncoder(w).Encode(map[string]string{
		"error": msg,
		"code":  code,
	})
}