package test

import (
	"RenewCMS/internal/domain/user"
	"RenewCMS/internal/infrastructure/useCases"
	"errors"
	"testing"
	"time"
)

func TestResetPasswordUseCase(t *testing.T) {
	newRepo := func(expiration time.Time) *mockUserRepo {
		repo := newMockUserRepo()
		repo.users[3] = user.User{
			ID:                      3,
			Email:                   "alice@example.com",
			PasswordResetCode:       "hashed:reset-code-1",
			PasswordResetExpiration: expiration,
		}
		return repo
	}

	t.Run("The use case itself sets the password and clears the code in one write, independently of any handler", func(t *testing.T) {
		repo := newRepo(time.Now().Add(time.Hour))
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "reset-code-1", "newpassword1")

		if err != nil {
			t.Fatalf("expected no error, got %v", err)
		}
		if repo.resetPasswordCalls != 1 {
			t.Fatalf("expected ResetPassword to be called exactly once, got %d", repo.resetPasswordCalls)
		}
		if repo.lastResetPasswordUserId != 3 {
			t.Errorf("expected userId 3, got %d", repo.lastResetPasswordUserId)
		}
		if repo.lastResetPasswordHash != "hashed:newpassword1" {
			t.Errorf("expected hash %q, got %q", "hashed:newpassword1", repo.lastResetPasswordHash)
		}
	})

	t.Run("The use case itself advances TokenVersion by one on every successful reset, independently of any handler", func(t *testing.T) {
		repo := newRepo(time.Now().Add(time.Hour))
		repo.users[3] = user.User{
			ID:                      3,
			Email:                   "alice@example.com",
			TokenVersion:            5,
			PasswordResetCode:       "hashed:reset-code-1",
			PasswordResetExpiration: time.Now().Add(time.Hour),
		}
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "reset-code-1", "newpassword1")

		if err != nil {
			t.Fatalf("expected no error, got %v", err)
		}
		if repo.users[3].TokenVersion != 6 {
			t.Errorf("expected TokenVersion 6, got %d", repo.users[3].TokenVersion)
		}
	})

	t.Run("The use case rejects a wrong code without touching the repository's ResetPassword method", func(t *testing.T) {
		repo := newRepo(time.Now().Add(time.Hour))
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "wrong-code", "newpassword1")

		if !errors.Is(err, user.ErrInvalidPasswordResetCode) {
			t.Errorf("expected user.ErrInvalidPasswordResetCode, got %v", err)
		}
		if repo.resetPasswordCalls != 0 {
			t.Errorf("expected ResetPassword to never be called, got %d", repo.resetPasswordCalls)
		}
	})

	t.Run("The use case rejects an expired code without touching the repository's ResetPassword method", func(t *testing.T) {
		repo := newRepo(time.Now().Add(-time.Hour))
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "reset-code-1", "newpassword1")

		if !errors.Is(err, user.ErrPasswordResetCodeExpired) {
			t.Errorf("expected user.ErrPasswordResetCodeExpired, got %v", err)
		}
		if repo.resetPasswordCalls != 0 {
			t.Errorf("expected ResetPassword to never be called, got %d", repo.resetPasswordCalls)
		}
	})

	t.Run("The use case treats an unknown email the same as a wrong code", func(t *testing.T) {
		repo := newMockUserRepo()
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("nobody@example.com", "any-code", "newpassword1")

		if !errors.Is(err, user.ErrInvalidPasswordResetCode) {
			t.Errorf("expected user.ErrInvalidPasswordResetCode, got %v", err)
		}
		if repo.resetPasswordCalls != 0 {
			t.Errorf("expected ResetPassword to never be called, got %d", repo.resetPasswordCalls)
		}
	})

	t.Run("The use case treats an empty stored code the same as a wrong code, never calling Compare with an empty hash", func(t *testing.T) {
		repo := newMockUserRepo()
		repo.users[3] = user.User{ID: 3, Email: "alice@example.com", PasswordResetCode: ""}
		hasher := &stubHasher{}
		uc := useCases.NewResetPasswordUseCase(repo, hasher, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "anything", "newpassword1")

		if !errors.Is(err, user.ErrInvalidPasswordResetCode) {
			t.Errorf("expected user.ErrInvalidPasswordResetCode, got %v", err)
		}
		if repo.resetPasswordCalls != 0 {
			t.Errorf("expected ResetPassword to never be called, got %d", repo.resetPasswordCalls)
		}
		if hasher.compareCalls != 0 {
			t.Errorf("expected Compare to never be called, got %d calls", hasher.compareCalls)
		}
	})

	t.Run("The use case treats any GetByEmail failure, not just not-found, as an invalid code", func(t *testing.T) {
		repo := newRepo(time.Now().Add(time.Hour))
		repo.fail.failNextWith("GetByEmail", errors.New("db is down"))
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "reset-code-1", "newpassword1")

		if !errors.Is(err, user.ErrInvalidPasswordResetCode) {
			t.Errorf("expected user.ErrInvalidPasswordResetCode, got %v", err)
		}
		if repo.resetPasswordCalls != 0 {
			t.Errorf("expected ResetPassword to never be called, got %d", repo.resetPasswordCalls)
		}
	})

	t.Run("A hashing failure propagates and the repository's ResetPassword method is never called", func(t *testing.T) {
		repo := newRepo(time.Now().Add(time.Hour))
		hashErr := errors.New("hash blew up")
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{hashErr: hashErr}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "reset-code-1", "newpassword1")

		if !errors.Is(err, hashErr) {
			t.Errorf("expected %v, got %v", hashErr, err)
		}
		if repo.resetPasswordCalls != 0 {
			t.Errorf("expected ResetPassword to never be called, got %d", repo.resetPasswordCalls)
		}
	})

	t.Run("A failure in the repository's ResetPassword method propagates", func(t *testing.T) {
		repo := newRepo(time.Now().Add(time.Hour))
		repo.fail.failNext("ResetPassword")
		uc := useCases.NewResetPasswordUseCase(repo, &stubHasher{}, newMockAPIKeyRepo(), time.Now)

		err := uc.ResetPassword("alice@example.com", "reset-code-1", "newpassword1")

		if !errors.Is(err, errRepositoryFailure) {
			t.Errorf("expected %v, got %v", errRepositoryFailure, err)
		}
	})

}