package smtp

import (
	stdsmtp "net/smtp"
	"strings"
	"testing"

	"internal-mail-skill/internal/config"
)

func TestBuildMessageOmitsBccHeaderButKeepsRecipients(t *testing.T) {
	req := SendRequest{
		FromAddress: "agent@example.com",
		FromName:    "Agent",
		To:          []string{"to@example.com"},
		Cc:          []string{"cc@example.com"},
		Bcc:         []string{"hidden@example.com"},
		Subject:     "Hello",
		Body:        "Body",
	}

	msg, recipients, err := BuildMessage(req)
	if err != nil {
		t.Fatalf("BuildMessage() error = %v", err)
	}
	raw := string(msg)
	if strings.Contains(raw, "Bcc:") || strings.Contains(raw, "hidden@example.com") {
		t.Fatalf("raw message leaked Bcc: %s", raw)
	}
	if len(recipients) != 3 {
		t.Fatalf("recipients = %#v", recipients)
	}
	if recipients[2] != "hidden@example.com" {
		t.Fatalf("Bcc missing from envelope recipients: %#v", recipients)
	}
}

func TestAuthForConfigRequiresExplicitOptInForCleartextAuth(t *testing.T) {
	cfg := config.SMTPConfig{
		Host:         "smtp.example.local",
		Username:     "user",
		Password:     "secret",
		AuthRequired: true,
	}

	if _, err := authForConfig(cfg); err == nil {
		t.Fatal("authForConfig() error = nil, want cleartext auth rejection")
	}

	cfg.AllowInsecureAuth = true
	auth, err := authForConfig(cfg)
	if err != nil {
		t.Fatalf("authForConfig() with opt-in error = %v", err)
	}
	proto, _, err := auth.Start(&stdsmtp.ServerInfo{Name: cfg.Host, TLS: false})
	if err != nil {
		t.Fatalf("insecure auth Start() error = %v", err)
	}
	if proto != "PLAIN" {
		t.Fatalf("proto = %q, want PLAIN", proto)
	}

	cfg.AllowInsecureAuth = false
	cfg.UseSTARTTLS = true
	auth, err = authForConfig(cfg)
	if err != nil {
		t.Fatalf("authForConfig() over STARTTLS error = %v", err)
	}
	if _, _, err := auth.Start(&stdsmtp.ServerInfo{Name: cfg.Host, TLS: true}); err != nil {
		t.Fatalf("TLS auth Start() error = %v", err)
	}
}

func TestAuthForConfigAllowsImplicitTLSAuth(t *testing.T) {
	cfg := config.SMTPConfig{
		Host:         "smtp.example.local",
		Username:     "user",
		Password:     "secret",
		AuthRequired: true,
		UseTLS:       true,
	}

	auth, err := authForConfig(cfg)
	if err != nil {
		t.Fatalf("authForConfig() error = %v", err)
	}
	if _, _, err := auth.Start(&stdsmtp.ServerInfo{Name: cfg.Host, TLS: false}); err != nil {
		t.Fatalf("implicit TLS auth Start() error = %v", err)
	}
}