"""
Build Optimizer Agent

Optimizes build configurations for faster builds, smaller bundles,
and better performance.
"""

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


class BuildOptimizerAgent(BaseAgent):
    """
    Optimizes build configurations.

    Features:
    - Build time optimization
    - Bundle size reduction
    - Dependency optimization
    - Caching strategies
    - Parallel builds
    - Tree shaking
    """

    def __init__(self):
        super().__init__(
            name='build-optimizer',
            description='Optimize build configurations',
            category='engineering',
            version='1.0.0',
            tags=['build', 'optimization', 'webpack', 'bundling', 'performance']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Optimize build configuration.

        Args:
            params: {
                'project_path': str,
                'build_tool': 'webpack|vite|rollup|parcel|esbuild',
                'target': 'development|production',
                'options': {
                    'optimize_bundle_size': bool,
                    'enable_caching': bool,
                    'enable_parallel_build': bool,
                    'tree_shaking': bool,
                    'code_splitting': bool
                }
            }

        Returns:
            {
                'status': 'success|failed',
                'optimizations_applied': List[str],
                'build_time_improvement': float,
                'bundle_size_reduction': float,
                'configuration_changes': Dict
            }
        """
        project_path = params.get('project_path')
        build_tool = params.get('build_tool', 'webpack')
        target = params.get('target', 'production')
        options = params.get('options', {})

        self.logger.info(
            f"Optimizing {build_tool} build for {target}"
        )

        # Mock build optimization results
        optimizations_applied = [
            'Enabled parallel builds',
            'Configured build caching',
            'Enabled tree shaking',
            'Configured code splitting',
            'Optimized chunk sizes',
            'Enabled compression (gzip/brotli)',
            'Minimized JavaScript',
            'Minimized CSS',
            'Optimized images',
            'Removed duplicate dependencies'
        ]

        configuration_changes = {
            'webpack': {
                'mode': target,
                'cache': {
                    'type': 'filesystem',
                    'cacheDirectory': '.webpack-cache'
                },
                'optimization': {
                    'minimize': True,
                    'splitChunks': {
                        'chunks': 'all',
                        'cacheGroups': {
                            'vendor': {
                                'test': '/node_modules/',
                                'name': 'vendors',
                                'priority': 10
                            }
                        }
                    },
                    'runtimeChunk': 'single',
                    'usedExports': True,
                    'sideEffects': True
                },
                'performance': {
                    'maxAssetSize': 500000,
                    'maxEntrypointSize': 500000
                },
                'parallelism': 4
            }
        }

        metrics_before = {
            'build_time': 45.3,  # seconds
            'bundle_size': 2.4,  # MB
            'chunks': 1,
            'assets': 5
        }

        metrics_after = {
            'build_time': 12.7,  # seconds
            'bundle_size': 1.2,  # MB
            'chunks': 4,
            'assets': 8
        }

        return {
            'status': 'success',
            'project_path': project_path,
            'build_tool': build_tool,
            'target': target,
            'optimizations_applied': optimizations_applied,
            'total_optimizations': len(optimizations_applied),
            'metrics_before': metrics_before,
            'metrics_after': metrics_after,
            'build_time_improvement': (
                (metrics_before['build_time'] - metrics_after['build_time'])
                / metrics_before['build_time'] * 100
            ),
            'bundle_size_reduction': (
                (metrics_before['bundle_size'] - metrics_after['bundle_size'])
                / metrics_before['bundle_size'] * 100
            ),
            'configuration_changes': configuration_changes,
            'features_enabled': {
                'caching': options.get('enable_caching', True),
                'parallel_build': options.get('enable_parallel_build', True),
                'tree_shaking': options.get('tree_shaking', True),
                'code_splitting': options.get('code_splitting', True),
                'minification': True,
                'compression': True,
                'source_maps': target == 'development'
            },
            'bundle_analysis': {
                'total_size': '1.2 MB',
                'vendor_size': '800 KB',
                'app_size': '400 KB',
                'largest_chunks': [
                    {'name': 'vendors.js', 'size': '800 KB'},
                    {'name': 'main.js', 'size': '400 KB'}
                ]
            },
            'recommendations': [
                'Consider lazy loading routes',
                'Use dynamic imports for large modules',
                'Enable compression on server',
                'Use CDN for vendor libraries',
                'Implement aggressive caching',
                'Monitor bundle size in CI/CD',
                'Use lighter alternatives for heavy libraries'
            ],
            'next_steps': [
                'Test optimized build',
                'Verify functionality',
                'Deploy to staging',
                'Monitor performance metrics',
                'Set up bundle size budgets',
                'Configure CI/CD build optimization'
            ]
        }

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

        valid_tools = ['webpack', 'vite', 'rollup', 'parcel', 'esbuild']
        build_tool = params.get('build_tool', 'webpack')

        if build_tool not in valid_tools:
            self.logger.error(f"Unsupported build tool: {build_tool}")
            return False

        return True
