package services

import (
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/treytartt/casera-api/internal/models"
	"github.com/treytartt/casera-api/internal/repositories"
	"github.com/treytartt/casera-api/internal/testutil"
)

// setupSubscriptionService creates a SubscriptionService with the given
// IAP clients (nil means "not configured"). It bypasses NewSubscriptionService
// which tries to load config from environment.
func setupSubscriptionService(t *testing.T, appleClient *AppleIAPClient, googleClient *GoogleIAPClient) (*SubscriptionService, *repositories.SubscriptionRepository) {
	db := testutil.SetupTestDB(t)

	subscriptionRepo := repositories.NewSubscriptionRepository(db)
	residenceRepo := repositories.NewResidenceRepository(db)
	taskRepo := repositories.NewTaskRepository(db)
	contractorRepo := repositories.NewContractorRepository(db)
	documentRepo := repositories.NewDocumentRepository(db)

	// Create a test user and subscription record for the test
	user := testutil.CreateTestUser(t, db, "subuser", "subuser@test.com", "password")

	// Create subscription record so GetOrCreate will find it
	sub := &models.UserSubscription{
		UserID: user.ID,
		Tier:   models.TierFree,
	}
	err := db.Create(sub).Error
	require.NoError(t, err)

	svc := &SubscriptionService{
		subscriptionRepo: subscriptionRepo,
		residenceRepo:    residenceRepo,
		taskRepo:         taskRepo,
		contractorRepo:   contractorRepo,
		documentRepo:     documentRepo,
		appleClient:      appleClient,
		googleClient:     googleClient,
	}

	return svc, subscriptionRepo
}

func TestProcessApplePurchase_ClientNil_ReturnsError(t *testing.T) {
	db := testutil.SetupTestDB(t)
	subscriptionRepo := repositories.NewSubscriptionRepository(db)
	residenceRepo := repositories.NewResidenceRepository(db)
	taskRepo := repositories.NewTaskRepository(db)
	contractorRepo := repositories.NewContractorRepository(db)
	documentRepo := repositories.NewDocumentRepository(db)

	user := testutil.CreateTestUser(t, db, "subuser", "subuser@test.com", "password")
	sub := &models.UserSubscription{UserID: user.ID, Tier: models.TierFree}
	require.NoError(t, db.Create(sub).Error)

	svc := &SubscriptionService{
		subscriptionRepo: subscriptionRepo,
		residenceRepo:    residenceRepo,
		taskRepo:         taskRepo,
		contractorRepo:   contractorRepo,
		documentRepo:     documentRepo,
		appleClient:      nil, // Not configured
		googleClient:     nil,
	}

	_, err := svc.ProcessApplePurchase(user.ID, "fake-receipt", "")
	assert.Error(t, err, "ProcessApplePurchase should return error when Apple IAP client is nil")

	// Verify user was NOT upgraded to Pro
	updatedSub, err := subscriptionRepo.GetOrCreate(user.ID)
	require.NoError(t, err)
	assert.Equal(t, models.TierFree, updatedSub.Tier, "User should remain on free tier when IAP client is nil")
}

func TestProcessApplePurchase_ValidationFails_DoesNotUpgrade(t *testing.T) {
	// We cannot easily create a real AppleIAPClient that will fail validation
	// in a unit test (it requires real keys and network access).
	// Instead, we test the code path logic:
	// When appleClient is nil, the service must NOT upgrade the user.
	// This is the same as TestProcessApplePurchase_ClientNil_ReturnsError
	// but validates no fallback occurs for the specific case.

	db := testutil.SetupTestDB(t)
	subscriptionRepo := repositories.NewSubscriptionRepository(db)
	residenceRepo := repositories.NewResidenceRepository(db)
	taskRepo := repositories.NewTaskRepository(db)
	contractorRepo := repositories.NewContractorRepository(db)
	documentRepo := repositories.NewDocumentRepository(db)

	user := testutil.CreateTestUser(t, db, "subuser2", "subuser2@test.com", "password")
	sub := &models.UserSubscription{UserID: user.ID, Tier: models.TierFree}
	require.NoError(t, db.Create(sub).Error)

	svc := &SubscriptionService{
		subscriptionRepo: subscriptionRepo,
		residenceRepo:    residenceRepo,
		taskRepo:         taskRepo,
		contractorRepo:   contractorRepo,
		documentRepo:     documentRepo,
		appleClient:      nil,
		googleClient:     nil,
	}

	// Neither receipt data nor transaction ID - should still not grant Pro
	_, err := svc.ProcessApplePurchase(user.ID, "", "")
	assert.Error(t, err, "ProcessApplePurchase should return error when client is nil, even with empty data")

	// Verify no upgrade happened
	updatedSub, err := subscriptionRepo.GetOrCreate(user.ID)
	require.NoError(t, err)
	assert.Equal(t, models.TierFree, updatedSub.Tier, "User should remain on free tier")
}

func TestProcessGooglePurchase_ClientNil_ReturnsError(t *testing.T) {
	db := testutil.SetupTestDB(t)
	subscriptionRepo := repositories.NewSubscriptionRepository(db)
	residenceRepo := repositories.NewResidenceRepository(db)
	taskRepo := repositories.NewTaskRepository(db)
	contractorRepo := repositories.NewContractorRepository(db)
	documentRepo := repositories.NewDocumentRepository(db)

	user := testutil.CreateTestUser(t, db, "subuser3", "subuser3@test.com", "password")
	sub := &models.UserSubscription{UserID: user.ID, Tier: models.TierFree}
	require.NoError(t, db.Create(sub).Error)

	svc := &SubscriptionService{
		subscriptionRepo: subscriptionRepo,
		residenceRepo:    residenceRepo,
		taskRepo:         taskRepo,
		contractorRepo:   contractorRepo,
		documentRepo:     documentRepo,
		appleClient:      nil,
		googleClient:     nil, // Not configured
	}

	_, err := svc.ProcessGooglePurchase(user.ID, "fake-token", "com.tt.casera.pro.monthly")
	assert.Error(t, err, "ProcessGooglePurchase should return error when Google IAP client is nil")

	// Verify user was NOT upgraded to Pro
	updatedSub, err := subscriptionRepo.GetOrCreate(user.ID)
	require.NoError(t, err)
	assert.Equal(t, models.TierFree, updatedSub.Tier, "User should remain on free tier when IAP client is nil")
}

func TestProcessGooglePurchase_ValidationFails_DoesNotUpgrade(t *testing.T) {
	db := testutil.SetupTestDB(t)
	subscriptionRepo := repositories.NewSubscriptionRepository(db)
	residenceRepo := repositories.NewResidenceRepository(db)
	taskRepo := repositories.NewTaskRepository(db)
	contractorRepo := repositories.NewContractorRepository(db)
	documentRepo := repositories.NewDocumentRepository(db)

	user := testutil.CreateTestUser(t, db, "subuser4", "subuser4@test.com", "password")
	sub := &models.UserSubscription{UserID: user.ID, Tier: models.TierFree}
	require.NoError(t, db.Create(sub).Error)

	svc := &SubscriptionService{
		subscriptionRepo: subscriptionRepo,
		residenceRepo:    residenceRepo,
		taskRepo:         taskRepo,
		contractorRepo:   contractorRepo,
		documentRepo:     documentRepo,
		appleClient:      nil,
		googleClient:     nil, // Not configured
	}

	// With empty token
	_, err := svc.ProcessGooglePurchase(user.ID, "", "")
	assert.Error(t, err, "ProcessGooglePurchase should return error when client is nil")

	// Verify no upgrade happened
	updatedSub, err := subscriptionRepo.GetOrCreate(user.ID)
	require.NoError(t, err)
	assert.Equal(t, models.TierFree, updatedSub.Tier, "User should remain on free tier")
}