"""
Bundle Analyzer Agent

Analyzes bundle sizes, identifies large dependencies, and provides
recommendations for bundle optimization.
"""

from typing import Any, Dict, List
from agents.base import BaseAgent


class BundleAnalyzerAgent(BaseAgent):
    """
    Analyzes and optimizes bundle sizes.

    Features:
    - Bundle size analysis
    - Dependency analysis
    - Tree map visualization
    - Size recommendations
    - Duplicate detection
    - Lazy loading suggestions
    """

    def __init__(self):
        super().__init__(
            name='bundle-analyzer',
            description='Analyze and optimize bundle sizes',
            category='engineering',
            version='1.0.0',
            tags=['bundling', 'optimization', 'performance', 'webpack']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Analyze bundle.

        Args:
            params: {
                'bundle_path': str,
                'build_tool': 'webpack|rollup|parcel|vite',
                'options': {
                    'generate_treemap': bool,
                    'check_duplicates': bool,
                    'size_threshold': int,  # KB
                    'format': 'json|html|text'
                }
            }

        Returns:
            {
                'status': 'success|failed',
                'bundle_info': Dict,
                'large_modules': List[Dict],
                'duplicates': List[Dict],
                'recommendations': List[str]
            }
        """
        bundle_path = params.get('bundle_path')
        build_tool = params.get('build_tool', 'webpack')
        options = params.get('options', {})

        self.logger.info(
            f"Analyzing bundle at {bundle_path}"
        )

        # Mock bundle analysis
        bundle_info = {
            'total_size': 2456789,  # bytes
            'total_size_gzipped': 892345,
            'total_size_brotli': 756234,
            'num_chunks': 5,
            'num_modules': 234,
            'num_assets': 12
        }

        chunks = [
            {
                'name': 'vendors',
                'size': 1234567,
                'size_gzipped': 456789,
                'modules': 123,
                'percentage': 50.3
            },
            {
                'name': 'main',
                'size': 678901,
                'size_gzipped': 234567,
                'modules': 67,
                'percentage': 27.6
            },
            {
                'name': 'runtime',
                'size': 345678,
                'size_gzipped': 123456,
                'modules': 34,
                'percentage': 14.1
            },
            {
                'name': 'styles',
                'size': 123456,
                'size_gzipped': 45678,
                'modules': 8,
                'percentage': 5.0
            },
            {
                'name': 'polyfills',
                'size': 74187,
                'size_gzipped': 31855,
                'modules': 2,
                'percentage': 3.0
            }
        ]

        large_modules = [
            {
                'name': 'moment',
                'size': 289456,
                'size_gzipped': 98234,
                'percentage': 11.8,
                'suggestion': 'Replace with date-fns or day.js (80% smaller)'
            },
            {
                'name': 'lodash',
                'size': 234567,
                'size_gzipped': 87654,
                'percentage': 9.5,
                'suggestion': 'Import only needed functions, not entire library'
            },
            {
                'name': 'react-dom',
                'size': 178234,
                'size_gzipped': 67890,
                'percentage': 7.3,
                'suggestion': 'Core dependency, already optimized'
            },
            {
                'name': 'chart.js',
                'size': 156789,
                'size_gzipped': 54321,
                'percentage': 6.4,
                'suggestion': 'Consider lazy loading charts'
            }
        ]

        duplicates = [
            {
                'module': 'lodash',
                'versions': ['4.17.21', '4.17.19'],
                'total_size': 469134,
                'instances': 2,
                'suggestion': 'Deduplicate to single version'
            },
            {
                'module': 'tslib',
                'versions': ['2.4.0', '2.3.1'],
                'total_size': 34567,
                'instances': 2,
                'suggestion': 'Use resolutions in package.json'
            }
        ]

        recommendations = [
            'Replace moment (289 KB) with day.js (2 KB) - saves 287 KB',
            'Import specific lodash functions instead of entire library - saves ~150 KB',
            'Lazy load chart.js on demand - improves initial load by 157 KB',
            'Deduplicate dependencies - saves ~100 KB',
            'Enable compression (gzip/brotli) on server - reduces transfer size by 60%',
            'Use dynamic imports for routes - improves code splitting',
            'Remove unused dependencies from package.json',
            'Consider using lighter alternatives for heavy libraries'
        ]

        return {
            'status': 'success',
            'bundle_path': bundle_path,
            'build_tool': build_tool,
            'bundle_info': bundle_info,
            'total_size_mb': round(bundle_info['total_size'] / (1024 * 1024), 2),
            'total_size_gzipped_mb': round(bundle_info['total_size_gzipped'] / (1024 * 1024), 2),
            'compression_ratio': round(
                (1 - bundle_info['total_size_gzipped'] / bundle_info['total_size']) * 100, 1
            ),
            'chunks': chunks,
            'large_modules': large_modules,
            'total_large_modules': len(large_modules),
            'duplicates': duplicates if options.get('check_duplicates') else [],
            'duplicate_waste': sum(d['total_size'] for d in duplicates) if options.get('check_duplicates') else 0,
            'recommendations': recommendations,
            'potential_savings': {
                'replace_moment': 287000,
                'optimize_lodash': 150000,
                'lazy_load_charts': 157000,
                'deduplicate': 100000,
                'total_bytes': 694000,
                'total_mb': 0.66
            },
            'size_by_category': {
                'dependencies': 1800000,
                'app_code': 456789,
                'styles': 123456,
                'assets': 76544
            },
            'top_dependencies': [
                {'name': 'moment', 'size': 289456},
                {'name': 'lodash', 'size': 234567},
                {'name': 'react-dom', 'size': 178234},
                {'name': 'chart.js', 'size': 156789}
            ],
            'reports_generated': [
                'bundle-analysis.html' if options.get('generate_treemap') else None,
                'bundle-stats.json',
                'bundle-report.txt'
            ],
            'treemap_generated': options.get('generate_treemap', False),
            'next_steps': [
                'Review large modules and consider alternatives',
                'Implement lazy loading for non-critical modules',
                'Deduplicate dependencies',
                'Set up bundle size budgets in CI/CD',
                'Monitor bundle size trends',
                'Enable compression on server'
            ]
        }

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate bundle analysis parameters."""
        if 'bundle_path' not in params:
            self.logger.error("Missing required field: bundle_path")
            return False

        return True
