package httpapi

import (
	"net/http"
	"strings"

	"github.com/descrybe/descrybe-v2/apps/api/internal/campaigns"
	"github.com/descrybe/descrybe-v2/apps/api/internal/mail"
)

// POST /api/admin/settings/mail/test — send a one-off SMTP probe using platform settings.
func (s *Server) handleAdminTestMail(w http.ResponseWriter, r *http.Request) {
	if s.Mail == nil {
		Error(w, http.StatusServiceUnavailable, "mailer unavailable")
		return
	}
	var body struct {
		To string `json:"to"`
	}
	if err := DecodeJSONOptional(r, &body); err != nil {
		Error(w, http.StatusBadRequest, "invalid json")
		return
	}
	to := strings.TrimSpace(body.To)
	if to == "" {
		if email, ok := s.sessionUserEmail(r.Context()); ok {
			to = email
		}
	}
	if to == "" {
		Error(w, http.StatusBadRequest, "to is required")
		return
	}
	normalized, err := campaigns.NormalizeEmail(to)
	if err != nil {
		Error(w, http.StatusBadRequest, "invalid email")
		return
	}
	to = normalized
	if s.PlatformSettings != nil {
		if dry, err := s.PlatformSettings.ResolveEmailDryRun(r.Context()); err == nil && dry.DryRun {
			JSON(w, http.StatusOK, map[string]any{
				"status":       "skipped",
				"smtp_enabled": false,
				"dry_run":      true,
				"message":      "Email dry-run is on; disable dry-run in admin platform mail settings to send a real probe",
			})
			return
		}
	}
	enabled := s.Mail.Enabled()
	if !enabled {
		JSON(w, http.StatusOK, map[string]any{
			"status":       "skipped",
			"smtp_enabled": false,
			"message":      "SMTP is not configured in admin platform mail settings",
		})
		return
	}
	msg := mail.Message{
		To:      to,
		Subject: "Descrybe SMTP test",
		Text:    "This is a Descrybe platform SMTP test message.",
		HTML:    "<p>This is a Descrybe platform SMTP test message.</p>",
	}
	if err := s.Mail.Send(msg); err != nil {
		JSON(w, http.StatusOK, map[string]any{
			"status":       "failed",
			"smtp_enabled": true,
			"message":      "SMTP send failed — check host/credentials in platform mail settings",
		})
		return
	}
	JSON(w, http.StatusOK, map[string]any{
		"status":       "ok",
		"smtp_enabled": true,
		"message":      "Test message accepted by SMTP",
	})
}