package handlers

import (
	"net/http"
	"time"
)

// domainResponse represents a single domain in the API response.
type domainResponse struct {
	Domain      string   `json:"domain"`
	Nameservers []string `json:"nameservers,omitempty"`
	LastChecked string   `json:"lastChecked,omitempty"`
	Status      string   `json:"status"`
}

// domainsResponse is the top-level response for GET /api/v1/domains.
type domainsResponse struct {
	Domains []domainResponse `json:"domains"`
}

// HandleDomains returns the configured domains and their status.
func (h *Handlers) HandleDomains() http.HandlerFunc {
	return func(
		writer http.ResponseWriter,
		request *http.Request,
	) {
		configured := h.config.Domains
		snapshot := h.state.GetSnapshot()

		domains := make(
			[]domainResponse, 0, len(configured),
		)

		for _, domain := range configured {
			dr := domainResponse{
				Domain: domain,
				Status: "pending",
			}

			ds, ok := snapshot.Domains[domain]
			if ok {
				dr.Nameservers = ds.Nameservers
				dr.Status = "ok"

				if !ds.LastChecked.IsZero() {
					dr.LastChecked = ds.LastChecked.
						Format(time.RFC3339)
				}
			}

			domains = append(domains, dr)
		}

		h.respondJSON(
			writer, request,
			&domainsResponse{Domains: domains},
			http.StatusOK,
		)
	}
}