package service

import (
	"context"
	"testing"

	"git.threesix.ai/jordan/slack5-1770574304/pkg/logging"
	"git.threesix.ai/jordan/slack5-1770574304/services/preferences-api/internal/adapter/memory"
	"git.threesix.ai/jordan/slack5-1770574304/services/preferences-api/internal/domain"
)

func newTestPreferenceService() (*PreferenceService, *memory.PreferenceRepository) {
	repo := memory.NewPreferenceRepository()
	svc := NewPreferenceService(repo, logging.Nop())
	return svc, repo
}

func TestPreferenceService_GetPreferences_Defaults(t *testing.T) {
	svc, _ := newTestPreferenceService()

	prefs, err := svc.GetPreferences(context.Background(), "user-1")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if prefs.UserID != "user-1" {
		t.Errorf("expected user_id user-1, got %s", prefs.UserID)
	}
	if prefs.Theme != domain.ThemeSystem {
		t.Errorf("expected default theme system, got %s", prefs.Theme)
	}
	if prefs.Language != "en" {
		t.Errorf("expected default language en, got %s", prefs.Language)
	}
	if !prefs.Notifications.Email {
		t.Error("expected default notifications.email true")
	}
	if !prefs.Notifications.Push {
		t.Error("expected default notifications.push true")
	}
	if prefs.Notifications.Digest != domain.DigestWeekly {
		t.Errorf("expected default digest weekly, got %s", prefs.Notifications.Digest)
	}
}

func TestPreferenceService_GetPreferences_Existing(t *testing.T) {
	svc, repo := newTestPreferenceService()

	// Seed existing preferences
	existing := &domain.UserPreferences{
		UserID:   "user-1",
		Theme:    domain.ThemeDark,
		Language: "fr",
		Notifications: domain.NotificationPreferences{
			Email:  false,
			Push:   true,
			Digest: domain.DigestDaily,
		},
	}
	_ = repo.Upsert(context.Background(), existing)

	prefs, err := svc.GetPreferences(context.Background(), "user-1")
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if prefs.Theme != domain.ThemeDark {
		t.Errorf("expected theme dark, got %s", prefs.Theme)
	}
	if prefs.Language != "fr" {
		t.Errorf("expected language fr, got %s", prefs.Language)
	}
	if prefs.Notifications.Email {
		t.Error("expected notifications.email false")
	}
	if prefs.Notifications.Digest != domain.DigestDaily {
		t.Errorf("expected digest daily, got %s", prefs.Notifications.Digest)
	}
}

func TestPreferenceService_UpdatePreferences_Valid(t *testing.T) {
	svc, _ := newTestPreferenceService()

	prefs := &domain.UserPreferences{
		Theme:    domain.ThemeDark,
		Language: "ja",
		Notifications: domain.NotificationPreferences{
			Email:  false,
			Push:   false,
			Digest: domain.DigestNone,
		},
	}

	result, err := svc.UpdatePreferences(context.Background(), "user-1", prefs)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if result.UserID != "user-1" {
		t.Errorf("expected user_id user-1, got %s", result.UserID)
	}
	if result.Theme != domain.ThemeDark {
		t.Errorf("expected theme dark, got %s", result.Theme)
	}
	if result.Language != "ja" {
		t.Errorf("expected language ja, got %s", result.Language)
	}
}

func TestPreferenceService_UpdatePreferences_InvalidTheme(t *testing.T) {
	svc, _ := newTestPreferenceService()

	prefs := &domain.UserPreferences{
		Theme:    "invalid",
		Language: "en",
		Notifications: domain.NotificationPreferences{
			Email:  true,
			Push:   true,
			Digest: domain.DigestWeekly,
		},
	}

	_, err := svc.UpdatePreferences(context.Background(), "user-1", prefs)
	if err == nil {
		t.Fatal("expected error for invalid theme")
	}
	if err != domain.ErrInvalidTheme {
		t.Errorf("expected ErrInvalidTheme, got %v", err)
	}
}

func TestPreferenceService_UpdatePreferences_InvalidLanguage(t *testing.T) {
	svc, _ := newTestPreferenceService()

	prefs := &domain.UserPreferences{
		Theme:    domain.ThemeLight,
		Language: "xx",
		Notifications: domain.NotificationPreferences{
			Email:  true,
			Push:   true,
			Digest: domain.DigestWeekly,
		},
	}

	_, err := svc.UpdatePreferences(context.Background(), "user-1", prefs)
	if err == nil {
		t.Fatal("expected error for invalid language")
	}
	if err != domain.ErrInvalidLanguage {
		t.Errorf("expected ErrInvalidLanguage, got %v", err)
	}
}

func TestPreferenceService_UpdatePreferences_InvalidDigest(t *testing.T) {
	svc, _ := newTestPreferenceService()

	prefs := &domain.UserPreferences{
		Theme:    domain.ThemeLight,
		Language: "en",
		Notifications: domain.NotificationPreferences{
			Email:  true,
			Push:   true,
			Digest: "biweekly",
		},
	}

	_, err := svc.UpdatePreferences(context.Background(), "user-1", prefs)
	if err == nil {
		t.Fatal("expected error for invalid digest")
	}
	if err != domain.ErrInvalidDigest {
		t.Errorf("expected ErrInvalidDigest, got %v", err)
	}
}