/**
 * @fileoverview Precise syntax fix for endpoints.js
 * Handles specific syntax issues with surgical precision
 */

import fs from 'fs';
import path from 'path';

/**
 * Precise fix for syntax issues
 */
function preciseSyntaxFix() {
    try {
        console.log('=== PRECISE SYNTAX FIX FOR ENDPOINTS.JS ===');
        console.log('');

        const endpointsPath = path.join(process.cwd(), 'src/config/endpoints.js');
        let content = fs.readFileSync(endpointsPath, 'utf8');

        console.log('📁 Reading endpoints.js...');
        console.log(`📊 Original file size: ${content.length} characters`);

        // Create backup
        const backupPath = path.join(process.cwd(), `endpoints_precise_backup_${Date.now()}.js`);
        fs.writeFileSync(backupPath, content);
        console.log(`💾 Backup created: ${backupPath}`);

        let fixCount = 0;

        // Fix 1: Handle bracket notation in parameter names
        console.log('🔧 Fix 1: Bracket notation in parameter names...');
        const bracketFixes = content.match(/\s+[a-zA-Z_][a-zA-Z0-9_]*\[[^\]]+\](\[[^\]]+\])?\s*:/g);
        if (bracketFixes) {
            console.log(`  Found ${bracketFixes.length} bracket notation issues`);
            content = content.replace(/(\s+)([a-zA-Z_][a-zA-Z0-9_]*\[[^\]]+\](?:\[[^\]]+\])?)(\s*:\s*\{)/g, '$1"$2"$3');
            fixCount += bracketFixes.length;
        }

        // Fix 2: Handle malformed parameter definitions with trailing commas
        console.log('🔧 Fix 2: Malformed parameter definitions...');
        const malformedParams = content.match(/description:\s*"[^"]*"\s*,\s*\n\s*[a-zA-Z_]/g);
        if (malformedParams) {
            console.log(`  Found ${malformedParams.length} malformed parameter definitions`);
            content = content.replace(/(\w+:\s*\{\s*type:\s*"[^"]*",\s*required:\s*[^,]*,\s*description:\s*"[^"]*")\s*,\s*\n(\s*)([a-zA-Z_])/g, '$1 },\n$2$3');
            fixCount += malformedParams.length;
        }

        // Fix 3: Handle missing closing braces for parameters
        console.log('🔧 Fix 3: Missing closing braces...');
        content = content.replace(/(\w+:\s*\{\s*type:\s*"[^"]*",\s*required:\s*[^,]*,\s*description:\s*"[^"]*")\s*\n(\s*)(\w+:)/g, '$1 },\n$2$3');

        // Fix 4: Handle excessive closing braces
        console.log('🔧 Fix 4: Excessive closing braces...');
        const excessiveBraces = content.match(/\}\}\}+/g);
        if (excessiveBraces) {
            console.log(`  Found ${excessiveBraces.length} excessive brace sequences`);
            content = content.replace(/\}\}\}+/g, '}');
            fixCount += excessiveBraces.length;
        }

        // Fix 5: Remove duplicate parameters in the same block
        console.log('🔧 Fix 5: Duplicate parameters...');
        content = fixDuplicateParametersInBlocks(content);

        // Fix 6: Ensure proper parameter block structure
        console.log('🔧 Fix 6: Parameter block structure...');
        content = fixParameterBlockStructure(content);

        // Write the fixed content
        fs.writeFileSync(endpointsPath, content);
        
        console.log(`📊 Fixed file size: ${content.length} characters`);
        console.log(`🔧 Total fixes applied: ${fixCount}`);
        console.log('');
        console.log('✅ Precise syntax fix completed!');

        return {
            backupPath: backupPath,
            fixCount: fixCount,
            success: true
        };

    } catch (error) {
        console.error('❌ Error in precise syntax fix:', error);
        throw error;
    }
}

/**
 * Fix duplicate parameters within parameter blocks
 */
function fixDuplicateParametersInBlocks(content) {
    console.log('  Processing duplicate parameters in blocks...');
    
    let duplicatesRemoved = 0;
    
    // Find all parameter blocks
    content = content.replace(/parameters:\s*\{([^}]*(?:\{[^}]*\}[^}]*)*)\}/g, (match, paramBlock) => {
        const lines = paramBlock.split('\n');
        const cleanedLines = [];
        const seenParams = new Set();
        
        for (const line of lines) {
            // Check if this line starts a parameter definition
            const paramMatch = line.match(/^\s*(\w+):\s*\{/);
            if (paramMatch) {
                const paramName = paramMatch[1];
                if (!seenParams.has(paramName)) {
                    seenParams.add(paramName);
                    cleanedLines.push(line);
                } else {
                    duplicatesRemoved++;
                    // Skip this duplicate parameter and its definition
                    continue;
                }
            } else {
                cleanedLines.push(line);
            }
        }
        
        return `parameters: {${cleanedLines.join('\n')}}`;
    });
    
    if (duplicatesRemoved > 0) {
        console.log(`  Removed ${duplicatesRemoved} duplicate parameters`);
    }
    
    return content;
}

/**
 * Fix parameter block structure
 */
function fixParameterBlockStructure(content) {
    console.log('  Processing parameter block structure...');
    
    // Ensure all parameter definitions end with proper closing brace and comma
    content = content.replace(
        /(\w+:\s*\{\s*type:\s*"[^"]*",\s*required:\s*(?:true|false),\s*description:\s*"[^"]*")\s*(?:\})?(?:,)?\s*\n(\s*)(\w+:|"[^"]+":|\})/g,
        (match, paramDef, indent, nextItem) => {
            if (nextItem === '}') {
                return `${paramDef} }\n${indent}${nextItem}`;
            } else {
                return `${paramDef} },\n${indent}${nextItem}`;
            }
        }
    );
    
    // Fix trailing commas before closing braces
    content = content.replace(/,(\s*\})/g, '$1');
    
    return content;
}

/**
 * Validate the fixed file
 */
async function validateFixedFile() {
    try {
        console.log('🔍 Validating fixed endpoints.js...');
        
        const endpointsPath = path.join(process.cwd(), 'src/config/endpoints.js');
        
        // Use Node.js syntax check
        const { spawn } = await import('child_process');
        
        return new Promise((resolve) => {
            const child = spawn('node', ['-c', endpointsPath], {
                stdio: ['pipe', 'pipe', 'pipe']
            });
            
            let stderr = '';
            child.stderr.on('data', (data) => {
                stderr += data.toString();
            });
            
            child.on('close', (code) => {
                if (code === 0) {
                    console.log('✅ File syntax is valid');
                    resolve(true);
                } else {
                    console.error('❌ Syntax errors still exist:');
                    console.error(stderr);
                    resolve(false);
                }
            });
        });
        
    } catch (error) {
        console.error('❌ Error validating file:', error);
        return false;
    }
}

// Run the fix
if (import.meta.url === `file://${process.argv[1]}`) {
    (async () => {
        try {
            const result = preciseSyntaxFix();
            
            console.log('');
            console.log('=== VALIDATION ===');
            
            const isValid = await validateFixedFile();
            
            if (isValid) {
                console.log('🎉 Endpoints.js syntax successfully fixed and validated!');
                console.log('✅ Ready to test HTTP server startup');
            } else {
                console.log('⚠️  Some syntax errors may remain. Manual review needed.');
            }
            
            console.log(`💾 Backup saved: ${result.backupPath}`);
            console.log(`🔧 Total fixes applied: ${result.fixCount}`);
            
        } catch (error) {
            console.error('❌ Failed to fix syntax errors:', error);
        }
    })();
}

export { preciseSyntaxFix };