package test

import (
	"RenewCMS/internal/infrastructure/config"
	"RenewCMS/internal/infrastructure/mailer"
	"RenewCMS/internal/infrastructure/useCases"
	"os"
	"strings"
	"testing"
)

func TestTransactionalEmailTemplates(t *testing.T) {
	t.Run("render() produces the verification email's subject, link and copy", func(t *testing.T) {
		repo := mailer.NewMailRepository(config.SmtpSettings{})

		subject, body, err := repo.Render("verification", useCases.MailValidationData{
			Host:             "https://cms.example.com",
			VerificationCode: "abc123",
		})

		if err != nil {
			t.Fatalf("expected no error, got %v", err)
		}
		if subject != "Verify your RenewCMS account" {
			t.Errorf("expected subject %q, got %q", "Verify your RenewCMS account", subject)
		}
		if !strings.Contains(body, "https://cms.example.com/register/validate?c=abc123") {
			t.Errorf("expected body to contain the verification link, got %q", body)
		}
		if !strings.Contains(body, "Verify my account") {
			t.Errorf("expected body to contain the button text, got %q", body)
		}
		if !strings.Contains(body, "This link expires in 2 hours.") {
			t.Errorf("expected body to contain the expiry copy, got %q", body)
		}
	})

	t.Run("render() produces the password-reset email's subject, link and copy", func(t *testing.T) {
		repo := mailer.NewMailRepository(config.SmtpSettings{})

		subject, body, err := repo.Render("password-reset", useCases.MailPasswordResetData{
			Host:             "https://cms.example.com",
			VerificationCode: "abc123",
			Email:            "alice@example.com",
		})

		if err != nil {
			t.Fatalf("expected no error, got %v", err)
		}
		if subject != "Reset your RenewCMS password" {
			t.Errorf("expected subject %q, got %q", "Reset your RenewCMS password", subject)
		}
		if !strings.Contains(body, "https://cms.example.com/register/reset/validate?c=abc123&email=alice%40example.com") {
			t.Errorf("expected body to contain the password-reset link, got %q", body)
		}
		if !strings.Contains(body, "Choose a new password") {
			t.Errorf("expected body to contain the button text, got %q", body)
		}
		if !strings.Contains(body, "This link expires in 1 hour and works once.") {
			t.Errorf("expected body to contain the expiry copy, got %q", body)
		}
	})

	t.Run("render() falls back to the old default subject for an unrecognized template name", func(t *testing.T) {
		repo := mailer.NewMailRepository(config.SmtpSettings{})

		subject, body, err := repo.Render("does-not-exist", nil)

		if subject != "RenewCMS | Action required" {
			t.Errorf("expected fallback subject, got %q", subject)
		}
		if err == nil {
			t.Fatal("expected an error because templates/does-not-exist.html cannot be found")
		}
		if body != "" {
			t.Errorf("expected empty body, got %q", body)
		}
	})

	t.Run("A template execution failure is returned without sending", func(t *testing.T) {
		repo := mailer.NewMailRepository(config.SmtpSettings{})

		type incompatibleData struct {
			Unrelated int
		}

		_, body, err := repo.Render("verification", incompatibleData{Unrelated: 1})

		if err == nil {
			t.Fatal("expected an error from a failed template execution")
		}
		if body != "" {
			t.Errorf("expected empty body, got %q", body)
		}
	})

	t.Run("Send() returns a render error without dialing SMTP", func(t *testing.T) {
		repo := mailer.NewMailRepository(config.SmtpSettings{})

		_, _, renderErr := repo.Render("does-not-exist", nil)
		err := repo.Send("someone@example.com", "does-not-exist", nil)

		if err == nil {
			t.Fatal("expected an error from a failed render, got nil")
		}
		if err.Error() != renderErr.Error() {
			t.Errorf("expected Send to return the render error %q, got %q", renderErr, err)
		}
	})

	t.Run("The old template files no longer exist under their previous names", func(t *testing.T) {
		for _, oldFile := range []string{"mailValidation.html", "passwordReset.html"} {
			path := "../internal/infrastructure/mailer/templates/" + oldFile
			if _, err := os.Stat(path); !os.IsNotExist(err) {
				t.Errorf("expected %s to not exist, got err=%v", path, err)
			}
		}
	})
}