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

describe('LoginViewDataBuilder', () => {
  describe('happy paths', () => {
    it('should transform LoginPageDTO to LoginViewData correctly', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      expect(result).toEqual({
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
        showPassword: false,
        showErrorDetails: false,
        formState: {
          fields: {
            email: { value: '', error: undefined, touched: false, validating: false },
            password: { value: '', error: undefined, touched: false, validating: false },
            rememberMe: { value: false, error: undefined, touched: false, validating: false },
          },
          isValid: true,
          isSubmitting: false,
          submitError: undefined,
          submitCount: 0,
        },
        isSubmitting: false,
        submitError: undefined,
      });
    });

    it('should handle insufficient permissions flag correctly', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/admin',
        hasInsufficientPermissions: true,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      expect(result.hasInsufficientPermissions).toBe(true);
      expect(result.returnTo).toBe('/admin');
    });

    it('should handle empty returnTo path', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

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

  describe('data transformation', () => {
    it('should preserve all DTO fields in the output', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      expect(result.returnTo).toBe(loginPageDTO.returnTo);
      expect(result.hasInsufficientPermissions).toBe(loginPageDTO.hasInsufficientPermissions);
    });

    it('should not modify the input DTO', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const originalDTO = { ...loginPageDTO };
      LoginViewDataBuilder.build(loginPageDTO);

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

    it('should initialize form fields with default values', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      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);

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

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

    it('should initialize form state with default values', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      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 loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

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

  describe('edge cases', () => {
    it('should handle special characters in returnTo path', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard?param=value&other=test',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      expect(result.returnTo).toBe('/dashboard?param=value&other=test');
    });

    it('should handle returnTo with hash fragment', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard#section',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

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

    it('should handle returnTo with encoded characters', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard?redirect=%2Fadmin',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

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

  describe('form state structure', () => {
    it('should have all required form fields', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

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

    it('should have consistent field state structure', () => {
      const loginPageDTO: LoginPageDTO = {
        returnTo: '/dashboard',
        hasInsufficientPermissions: false,
      };

      const result = LoginViewDataBuilder.build(loginPageDTO);

      const fields = result.formState.fields;
      Object.values(fields).forEach((field) => {
        expect(field).toHaveProperty('value');
        expect(field).toHaveProperty('error');
        expect(field).toHaveProperty('touched');
        expect(field).toHaveProperty('validating');
      });
    });
  });
});