import { describe, it, expect } from 'vitest';
import { ForgotPasswordViewDataBuilder } from './ForgotPasswordViewDataBuilder';
import type { ForgotPasswordPageDTO } from '@/lib/services/auth/types/ForgotPasswordPageDTO';

describe('ForgotPasswordViewDataBuilder', () => {
  describe('happy paths', () => {
    it('should transform ForgotPasswordPageDTO to ForgotPasswordViewData correctly', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result).toEqual({
        returnTo: '/login',
        showSuccess: false,
        formState: {
          fields: {
            email: { value: '', error: undefined, touched: false, validating: false },
          },
          isValid: true,
          isSubmitting: false,
          submitError: undefined,
          submitCount: 0,
        },
        isSubmitting: false,
        submitError: undefined,
      });
    });

    it('should handle empty returnTo path', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.returnTo).toBe('');
    });

    it('should handle returnTo with query parameters', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login?error=expired',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.returnTo).toBe('/login?error=expired');
    });
  });

  describe('data transformation', () => {
    it('should preserve all DTO fields in the output', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.returnTo).toBe(forgotPasswordPageDTO.returnTo);
    });

    it('should not modify the input DTO', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const originalDTO = { ...forgotPasswordPageDTO };
      ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(forgotPasswordPageDTO).toEqual(originalDTO);
    });

    it('should initialize form field with default values', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.formState.fields.email.value).toBe('');
      expect(result.formState.fields.email.error).toBeUndefined();
      expect(result.formState.fields.email.touched).toBe(false);
      expect(result.formState.fields.email.validating).toBe(false);
    });

    it('should initialize form state with default values', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.formState.isValid).toBe(true);
      expect(result.formState.isSubmitting).toBe(false);
      expect(result.formState.submitError).toBeUndefined();
      expect(result.formState.submitCount).toBe(0);
    });

    it('should initialize UI state flags correctly', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.showSuccess).toBe(false);
      expect(result.isSubmitting).toBe(false);
      expect(result.submitError).toBeUndefined();
    });
  });

  describe('edge cases', () => {
    it('should handle returnTo with encoded characters', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login?redirect=%2Fdashboard',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.returnTo).toBe('/login?redirect=%2Fdashboard');
    });

    it('should handle returnTo with hash fragment', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login#section',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.returnTo).toBe('/login#section');
    });
  });

  describe('form state structure', () => {
    it('should have email field', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      expect(result.formState.fields).toHaveProperty('email');
    });

    it('should have consistent field state structure', () => {
      const forgotPasswordPageDTO: ForgotPasswordPageDTO = {
        returnTo: '/login',
      };

      const result = ForgotPasswordViewDataBuilder.build(forgotPasswordPageDTO);

      const field = result.formState.fields.email;
      expect(field).toHaveProperty('value');
      expect(field).toHaveProperty('error');
      expect(field).toHaveProperty('touched');
      expect(field).toHaveProperty('validating');
    });
  });
});