"""
Cache Manager Agent

Manages caching layers including Redis, Memcached, and CDN edge caches.
Handles cache operations, invalidation, and monitoring.
"""

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


class CacheManagerAgent(BaseAgent):
    """Manages caching layers and operations."""

    def __init__(self):
        super().__init__(
            name='cache-manager',
            description='Manage caching layers (Redis, Memcached, CDN)',
            category='devops',
            version='1.0.0',
            tags=['cache', 'redis', 'memcached', 'performance', 'caching']
        )

    async def execute(self, params: Dict[str, Any]) -> Dict[str, Any]:
        """
        Manage cache operations.

        Args:
            params: {
                'action': 'set|get|delete|flush|stats|invalidate',
                'cache_backend': 'redis|memcached|elasticache',
                'host': 'localhost',
                'port': 6379,
                'key': 'user:123',
                'value': {...},
                'ttl_seconds': 3600,
                'pattern': 'user:*',  # for bulk operations
                'cluster_mode': true|false,
                'namespace': 'app-cache',
                'compression': true|false,
                'invalidation_strategy': 'immediate|lazy|scheduled'
            }

        Returns:
            {
                'status': 'success',
                'operation': 'set',
                'keys_affected': 1,
                'cache_stats': {...}
            }
        """
        action = params.get('action', 'stats')
        backend = params.get('cache_backend', 'redis')
        key = params.get('key')
        pattern = params.get('pattern')
        namespace = params.get('namespace', 'default')

        self.logger.info(
            f"Cache {action} operation on {backend} (namespace: {namespace})"
        )

        result = {
            'status': 'success',
            'action': action,
            'cache_backend': backend,
            'namespace': namespace,
            'timestamp': '2025-11-16T00:00:00Z'
        }

        if action == 'set':
            result.update({
                'key': key,
                'ttl_seconds': params.get('ttl_seconds', 3600),
                'value_size_bytes': 1024,
                'compressed': params.get('compression', False),
                'expiry_time': '2025-11-16T01:00:00Z',
                'operation_time_ms': 2.3
            })

        if action == 'get':
            result.update({
                'key': key,
                'value': {'user_id': '123', 'name': 'John Doe'},
                'hit': True,
                'ttl_remaining_seconds': 3456,
                'value_size_bytes': 1024,
                'operation_time_ms': 1.2
            })

        if action == 'delete':
            result.update({
                'keys_deleted': 1 if key else 0,
                'pattern': pattern,
                'keys_matched': 15 if pattern else 1,
                'operation_time_ms': 5.6
            })

        if action == 'flush':
            result.update({
                'keys_flushed': 12345,
                'namespace_flushed': namespace,
                'operation_time_ms': 234.5
            })

        if action == 'invalidate':
            invalidation_patterns = params.get('patterns', [pattern]) if pattern else []
            result.update({
                'invalidation_strategy': params.get('invalidation_strategy', 'immediate'),
                'patterns_invalidated': invalidation_patterns,
                'keys_invalidated': 67,
                'cdn_purge_triggered': True,
                'operation_time_ms': 45.6
            })

        if action == 'stats':
            result.update({
                'cache_stats': {
                    'total_keys': 12345,
                    'memory_used_mb': 456.7,
                    'memory_total_mb': 1024.0,
                    'memory_usage_percent': 44.6,
                    'hit_rate_percent': 92.3,
                    'miss_rate_percent': 7.7,
                    'evictions': 234,
                    'expired_keys': 567,
                    'avg_ttl_seconds': 1800,
                    'ops_per_second': 5432,
                    'connections': 45,
                    'uptime_seconds': 864000
                },
                'by_namespace': {
                    'app-cache': {
                        'keys': 8000,
                        'memory_mb': 300.0,
                        'hit_rate': 94.5
                    },
                    'session-cache': {
                        'keys': 4345,
                        'memory_mb': 156.7,
                        'hit_rate': 89.2
                    }
                },
                'cluster_info': {
                    'cluster_mode': params.get('cluster_mode', False),
                    'nodes': 3 if params.get('cluster_mode') else 1,
                    'master_nodes': 3 if params.get('cluster_mode') else 1,
                    'replica_nodes': 3 if params.get('cluster_mode') else 0
                }
            })

        return result

    def validate_params(self, params: Dict[str, Any]) -> bool:
        """Validate cache management parameters."""
        valid_backends = ['redis', 'memcached', 'elasticache']
        backend = params.get('cache_backend', 'redis')
        if backend not in valid_backends:
            self.logger.error(f"Invalid cache_backend: {backend}")
            return False

        valid_actions = ['set', 'get', 'delete', 'flush', 'stats', 'invalidate']
        action = params.get('action', 'stats')
        if action not in valid_actions:
            self.logger.error(f"Invalid action: {action}")
            return False

        if action in ['set', 'get', 'delete'] and 'key' not in params:
            self.logger.error("Missing required field: key")
            return False

        if action == 'set' and 'value' not in params:
            self.logger.error("Missing required field: value")
            return False

        return True
