import { describe, expect, test } from 'vitest';
import { validateArrayAccess } from '../../utils/validation-helpers';
import { parseStreamingArgs } from './sequential-thinking-tool';

describe('Sequential Thinking Tool Streaming Parser', () => {
  test('should return null for empty or invalid input', () => {
    expect(parseStreamingArgs('')).toBeNull();
    expect(parseStreamingArgs('{')).toBeNull();
    expect(parseStreamingArgs('invalid json')).toBeNull();
    expect(parseStreamingArgs('{"other_field":')).toBeNull();
  });

  test('should parse complete JSON with all fields', () => {
    const completeJson = JSON.stringify({
      thought: 'I need to analyze this step by step',
      nextThoughtNeeded: true,
      thoughtNumber: 1,
    });

    const result = parseStreamingArgs(completeJson);

    expect(result).toEqual({
      thought: 'I need to analyze this step by step',
      nextThoughtNeeded: true,
      thoughtNumber: 1,
    });
  });

  test('should extract partial thought as it builds incrementally', () => {
    // Simulate the streaming chunks building up a thought
    const chunks = [
      '{"thought"',
      '{"thought":',
      '{"thought": "',
      '{"thought": "I',
      '{"thought": "I need',
      '{"thought": "I need to',
      '{"thought": "I need to analyze',
      '{"thought": "I need to analyze this",',
      '{"thought": "I need to analyze this", "nextThoughtNeeded"',
      '{"thought": "I need to analyze this", "nextThoughtNeeded":',
      '{"thought": "I need to analyze this", "nextThoughtNeeded": true',
      '{"thought": "I need to analyze this", "nextThoughtNeeded": true,',
      '{"thought": "I need to analyze this", "nextThoughtNeeded": true, "thoughtNumber": 1',
    ];

    // Test incremental building
    expect(parseStreamingArgs(validateArrayAccess(chunks, 0, 'test chunks'))).toBeNull(); // No colon yet
    expect(parseStreamingArgs(validateArrayAccess(chunks, 1, 'test chunks'))).toBeNull(); // No opening quote yet
    expect(parseStreamingArgs(validateArrayAccess(chunks, 2, 'test chunks'))).toEqual({
      thought: '',
    }); // Empty string
    expect(parseStreamingArgs(validateArrayAccess(chunks, 3, 'test chunks'))).toEqual({
      thought: 'I',
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 4, 'test chunks'))).toEqual({
      thought: 'I need',
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 5, 'test chunks'))).toEqual({
      thought: 'I need to',
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 6, 'test chunks'))).toEqual({
      thought: 'I need to analyze',
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 7, 'test chunks'))).toEqual({
      thought: 'I need to analyze this',
    });

    // As more fields are added
    expect(parseStreamingArgs(validateArrayAccess(chunks, 8, 'test chunks'))).toEqual({
      thought: 'I need to analyze this',
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 9, 'test chunks'))).toEqual({
      thought: 'I need to analyze this',
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 10, 'test chunks'))).toEqual({
      thought: 'I need to analyze this',
      nextThoughtNeeded: true,
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 11, 'test chunks'))).toEqual({
      thought: 'I need to analyze this',
      nextThoughtNeeded: true,
    });
    expect(parseStreamingArgs(validateArrayAccess(chunks, 12, 'test chunks'))).toEqual({
      thought: 'I need to analyze this',
      nextThoughtNeeded: true,
      thoughtNumber: 1,
    });
  });

  test('should handle boolean fields correctly', () => {
    const withBooleans = '{"nextThoughtNeeded": true';
    const result = parseStreamingArgs(withBooleans);

    expect(result).toEqual({
      nextThoughtNeeded: true,
    });
  });

  test('should handle number fields correctly', () => {
    const withNumbers = '{"thoughtNumber": 3';
    const result = parseStreamingArgs(withNumbers);

    expect(result).toEqual({
      thoughtNumber: 3,
    });
  });

  test('should handle escaped quotes in thought', () => {
    const withEscapedQuotes = '{"thought": "This is a \\"quoted\\" text"';
    const result = parseStreamingArgs(withEscapedQuotes);

    expect(result).toEqual({
      thought: 'This is a "quoted" text',
    });
  });

  test('should handle mixed field types', () => {
    const mixedFields =
      '{"thought": "Step 1 analysis", "thoughtNumber": 1, "nextThoughtNeeded": true';
    const result = parseStreamingArgs(mixedFields);

    expect(result).toEqual({
      thought: 'Step 1 analysis',
      thoughtNumber: 1,
      nextThoughtNeeded: true,
    });
  });

  test('should handle whitespace variations', () => {
    const withWhitespace =
      '{ "thought" : "Test" , "thoughtNumber" : 1 , "nextThoughtNeeded" : true';
    const result = parseStreamingArgs(withWhitespace);

    expect(result).toEqual({
      thought: 'Test',
      thoughtNumber: 1,
      nextThoughtNeeded: true,
    });
  });

  test('should handle complex thought with newlines and special characters', () => {
    const complexThought =
      '{"thought": "Step 1:\\nAnalyze the problem\\n- Check assumptions\\n- Review data"';
    const result = parseStreamingArgs(complexThought);

    expect(result).toEqual({
      thought: 'Step 1:\\nAnalyze the problem\\n- Check assumptions\\n- Review data',
    });
  });

  test('should return null if no recognized fields are present', () => {
    const withoutKnownFields = '{"unknown_field": "value", "other": 123';
    const result = parseStreamingArgs(withoutKnownFields);

    expect(result).toBeNull();
  });

  test('should handle complete JSON correctly', () => {
    const completeJson = JSON.stringify({
      thought: 'Complete thought',
      nextThoughtNeeded: false,
      thoughtNumber: 5,
    });

    const result = parseStreamingArgs(completeJson);

    expect(result).toEqual({
      thought: 'Complete thought',
      nextThoughtNeeded: false,
      thoughtNumber: 5,
    });
  });
});