/* global describe, it, before, after, beforeEach */

const assert = require('assert').strict;
const http = require('http');
const { promisify } = require('util');
const { exec } = require('child_process');
const execAsync = promisify(exec);
const path = require('path');
const fs = require('fs');

// Use absolute paths to avoid any path resolution issues
const rootDir = path.resolve(__dirname, '../..');
const DocumentHandler = require(path.join(rootDir, 'lib/document_handler'));
const Generator = require(path.join(rootDir, 'lib/key_generators/random'));

const PORT = 7777;
const HOST = 'localhost';
const SERVER_START_WAIT = 2000;

describe('Hastebin Core Functionality', function() {
  let testServer;

  // Increase timeout for slower operations
  this.timeout(10000);

  before(async function() {
    // Start server before tests
    const testServerPath = path.join(rootDir, 'test/utils/test-local.js');
    try {
      testServer = require(testServerPath);
      
      // Wait for server to start
      await new Promise(resolve => setTimeout(resolve, SERVER_START_WAIT));
    } catch (err) {
      console.error('Error starting test server:', err);
      throw err;
    }
  });

  after(async function() {
    this.timeout(5000);
    console.log('Shutting down test server...');
    
    if (testServer && testServer.server && typeof testServer.server.close === 'function') {
      await new Promise((resolve) => {
        testServer.server.close(() => {
          console.log('Server closed successfully');
          resolve();
        });
      });
    } else if (testServer && testServer.cleanup) {
      await testServer.cleanup(false);
    }
    
    // Force process termination if needed
    setTimeout(() => {
      console.log('Forcing process exit...');
      process.exit(0);
    }, 1000);
  });

  beforeEach(function() {
    // Clean test data before each test
    if (testServer && testServer.cleanTestData) {
      testServer.cleanTestData();
    }
  });

  describe('Document Handler', function() {
    describe('Key Generation', function() {
      it('should generate keys of the specified length', function() {
        const gen = new Generator();
        const dh = new DocumentHandler({ keyLength: 6, keyGenerator: gen });
        assert.equal(6, dh.acceptableKey().length);
      });

      it('should use the default key length when not specified', function() {
        const gen = new Generator();
        const dh = new DocumentHandler({ keyGenerator: gen });
        assert.equal(dh.keyLength, DocumentHandler.defaultKeyLength);
      });
    });
  });

  describe('Document Operations', function() {
    describe('Document Creation', function() {
      it('should create a new document', async function() {
        const testContent = 'Test document content';
        try {
          const { stdout } = await execAsync(
            `curl -s -X POST http://${HOST}:${PORT}/documents -d "${testContent}"`
          );
          const response = JSON.parse(stdout);
          
          assert(response.key && typeof response.key === 'string', 'Should return a valid document key');
          assert.equal(response.key.length, DocumentHandler.defaultKeyLength);
        } catch (error) {
          console.error('Error in create document test:', error);
          throw error;
        }
      });

      it('should handle empty documents', async function() {
        // The server should reject empty documents
        try {
          const { stdout, stderr } = await execAsync(
            `curl -s -i -X POST http://${HOST}:${PORT}/documents -d "" || echo "Error occurred"`
          );
          
          // If we get here, check if the response indicates an error
          const hasError = stdout.includes('400') || 
                          stdout.includes('Bad Request') || 
                          stderr.includes('Error');
          
          assert(hasError, 'Should return error status for empty document');
        } catch (error) {
          // If curl fails, that's also a valid test result
          assert(true, 'Error occurred as expected');
        }
      });
    });

    describe('Document Retrieval', function() {
      let documentKey;

      beforeEach(async function() {
        // Create a test document
        try {
          const { stdout } = await execAsync(
            `curl -s -X POST http://${HOST}:${PORT}/documents -d "Test retrieval content"`
          );
          const response = JSON.parse(stdout);
          documentKey = response.key;
        } catch (error) {
          console.error('Error creating test document:', error);
          throw error;
        }
      });

      it('should retrieve an existing document', async function() {
        try {
          const { stdout } = await execAsync(
            `curl -s http://${HOST}:${PORT}/raw/${documentKey}`
          );
          assert.equal(stdout, 'Test retrieval content');
        } catch (error) {
          console.error('Error retrieving document:', error);
          throw error;
        }
      });

      it('should handle non-existent documents', async function() {
        // The server should return 404 for non-existent documents
        try {
          const { stdout, stderr } = await execAsync(
            `curl -s -i http://${HOST}:${PORT}/raw/nonexistentkey || echo "Error occurred"`
          );
          
          // If we get here, check if the response indicates a 404
          const hasError = stdout.includes('404') || 
                          stdout.includes('Not Found') || 
                          stderr.includes('Error');
          
          assert(hasError, 'Should return 404 status for non-existent document');
        } catch (error) {
          // If curl fails, that's also a valid test result
          assert(true, 'Error occurred as expected');
        }
      });
    });
  });

  describe('Rate Limiting', function() {
    it('should enforce rate limits', async function() {
      try {
        // Make multiple rapid requests
        const requests = Array(10).fill().map(() => 
          execAsync(`curl -s -I http://${HOST}:${PORT}/`)
        );
        
        const responses = await Promise.all(requests);
        const hasRateLimit = responses.some(({ stdout }) => 
          stdout.includes('X-RateLimit-Remaining')
        );
        
        assert(hasRateLimit, 'Should include rate limit headers');
      } catch (error) {
        console.error('Error in rate limit test:', error);
        throw error;
      }
    });
  });
});