package mailer

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestFileModeAppendsMessages(t *testing.T) {
	filePath := filepath.Join(t.TempDir(), "mails.log")
	m, err := New(Config{
		Mode:     ModeFile,
		Sender:   "gardomatic@example.com",
		FilePath: filePath,
	})
	if err != nil {
		t.Fatalf("New() returned an error: %v", err)
	}

	data := map[string]any{
		"userID":          42,
		"activationToken": "test-token",
	}
	for _, recipient := range []string{"alice@example.com", "bob@example.com"} {
		if err = m.Send(recipient, "user_welcome.tmpl", data); err != nil {
			t.Fatalf("Send() returned an error: %v", err)
		}
	}

	content, err := os.ReadFile(filePath)
	if err != nil {
		t.Fatalf("reading mail output: %v", err)
	}
	output := string(content)

	if got := strings.Count(output, "=== gardomatic mail ==="); got != 2 {
		t.Errorf("message count = %d, want 2", got)
	}
	for _, expected := range []string{
		"alice@example.com",
		"bob@example.com",
		"Subject: Welcome to Gardomatic!",
		"test-token",
	} {
		if !strings.Contains(output, expected) {
			t.Errorf("output does not contain %q", expected)
		}
	}
}

func TestFileModeRequiresPath(t *testing.T) {
	_, err := New(Config{Mode: ModeFile, Sender: "gardomatic@example.com"})
	if err == nil {
		t.Fatal("New() returned no error without a file path")
	}
}

func TestNewRejectsUnknownMode(t *testing.T) {
	_, err := New(Config{Mode: "unknown", Sender: "gardomatic@example.com"})
	if err == nil {
		t.Fatal("New() returned no error for an unknown mode")
	}
}