/**
 * Unit Tests: ID Validation
 * 
 * Tests for ID parsing and validation in API routes and pages
 */

import { describe, test, expect } from 'bun:test';

describe('ID Validation', () => {
  describe('parseInt with validation', () => {
    test('should parse valid numeric string', () => {
      const id = '123';
      const parsedId = parseInt(id, 10);
      
      expect(parsedId).toBe(123);
      expect(isNaN(parsedId)).toBe(false);
    });

    test('should return NaN for non-numeric string', () => {
      const id = 'abc';
      const parsedId = parseInt(id, 10);
      
      expect(isNaN(parsedId)).toBe(true);
    });

    test('should return NaN for empty string', () => {
      const id = '';
      const parsedId = parseInt(id, 10);
      
      expect(isNaN(parsedId)).toBe(true);
    });

    test('should return NaN for non-numeric strings', () => {
      const id = 'abc';
      const parsedId = parseInt(id, 10);
      
      expect(isNaN(parsedId)).toBe(true);
    });

    test('should handle partial numeric strings (parseInt stops at first non-numeric)', () => {
      const id = '123abc';
      const parsedId = parseInt(id, 10);
      
      // Note: parseInt stops parsing at the first non-numeric character
      expect(parsedId).toBe(123);
      expect(isNaN(parsedId)).toBe(false);
    });

    test('should parse negative numbers', () => {
      const id = '-123';
      const parsedId = parseInt(id, 10);
      
      expect(parsedId).toBe(-123);
      expect(isNaN(parsedId)).toBe(false);
    });

    test('should handle float strings (truncates to integer)', () => {
      const id = '123.45';
      const parsedId = parseInt(id, 10);
      
      // Note: parseInt truncates, parseFloat would be better for floats
      expect(parsedId).toBe(123);
      expect(isNaN(parsedId)).toBe(false);
    });

    test('should handle leading zeros', () => {
      const id = '00123';
      const parsedId = parseInt(id, 10);
      
      expect(parsedId).toBe(123);
      expect(isNaN(parsedId)).toBe(false);
    });
  });

  describe('ID validation patterns', () => {
    test('should detect invalid ID for database queries', () => {
      // Note: parseInt behavior - stops at first non-numeric char
      const testCases = [
        { input: 'abc', shouldParseAsNaN: true, description: 'non-numeric string' },
        { input: '', shouldParseAsNaN: true, description: 'empty string' },
        { input: '123abc', shouldParseAsNaN: false, description: 'numeric prefix (parseInt stops at "a")' },
        { input: '123.45', shouldParseAsNaN: false, description: 'float string (truncates to 123)' },
        { input: '123', shouldParseAsNaN: false, description: 'valid numeric string' },
        { input: '0', shouldParseAsNaN: false, description: 'zero' },
        { input: '-123', shouldParseAsNaN: false, description: 'negative number' },
      ];

      testCases.forEach(({ input, shouldParseAsNaN, description }) => {
        const parsedId = parseInt(input, 10);
        const isNaNResult = isNaN(parsedId);
        
        expect(isNaNResult).toBe(shouldParseAsNaN);
      });
    });
  });

  describe('URL parameter validation', () => {
    test('should validate tournament ID from URL params', () => {
      const params = { id: '123' };
      const tournamentId = parseInt(params.id, 10);
      
      expect(isNaN(tournamentId)).toBe(false);
      expect(tournamentId).toBe(123);
    });

    test('should detect invalid tournament ID from URL params', () => {
      const params = { id: 'invalid' };
      const tournamentId = parseInt(params.id, 10);
      
      expect(isNaN(tournamentId)).toBe(true);
    });

    test('should validate player ID from URL params', () => {
      const params = { id: '456' };
      const playerId = parseInt(params.id, 10);
      
      expect(isNaN(playerId)).toBe(false);
      expect(playerId).toBe(456);
    });

    test('should detect invalid player ID from URL params', () => {
      const params = { id: 'not-a-number' };
      const playerId = parseInt(params.id, 10);
      
      expect(isNaN(playerId)).toBe(true);
    });
  });

  describe('Next.js 16 params handling', () => {
    test('should handle params as Promise (Next.js 16 requirement)', async () => {
      // In Next.js 16, params is a Promise
      const params = Promise.resolve({ id: '123' });
      
      // This is how Next.js 16 expects params to be handled
      const { id } = await params;
      const parsedId = parseInt(id, 10);
      
      expect(parsedId).toBe(123);
      expect(isNaN(parsedId)).toBe(false);
    });

    test('should handle invalid ID in Next.js 16 params', async () => {
      const params = Promise.resolve({ id: 'invalid' });
      
      const { id } = await params;
      const parsedId = parseInt(id, 10);
      
      expect(isNaN(parsedId)).toBe(true);
    });

    test('should handle empty ID in Next.js 16 params', async () => {
      const params = Promise.resolve({ id: '' });
      
      const { id } = await params;
      const parsedId = parseInt(id, 10);
      
      expect(isNaN(parsedId)).toBe(true);
    });
  });
});