"""
Rollback Manager Agent

Manages deployment rollbacks across different platforms including
Kubernetes, cloud platforms, and traditional deployments.
"""

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


class RollbackManagerAgent(BaseAgent):
    """Manages deployment rollbacks and version control."""

    def __init__(self):
        super().__init__(
            name='rollback-manager',
            description='Manage deployment rollbacks and version control',
            category='devops',
            version='1.0.0',
            tags=['rollback', 'deployment', 'versioning', 'recovery', 'kubernetes']
        )

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

        Args:
            params: {
                'action': 'rollback|list-versions|get-version|set-version',
                'platform': 'kubernetes|aws|gcp|azure|heroku',
                'deployment': 'app-deployment',
                'namespace': 'production',
                'target_version': 'v1.2.3|previous|revision-5',
                'auto_detect_failure': true|false,
                'health_check': {
                    'enabled': true,
                    'endpoint': '/health',
                    'timeout_seconds': 300
                },
                'rollback_strategy': 'instant|progressive|blue-green',
                'max_surge': 1,
                'max_unavailable': 0
            }

        Returns:
            {
                'status': 'success',
                'current_version': '1.2.4',
                'previous_version': '1.2.3',
                'rollback_completed': true
            }
        """
        action = params.get('action', 'rollback')
        platform = params.get('platform', 'kubernetes')
        deployment = params.get('deployment')
        target_version = params.get('target_version', 'previous')
        strategy = params.get('rollback_strategy', 'instant')

        self.logger.info(
            f"Rollback {action} on {platform}: {deployment} to {target_version}"
        )

        result = {
            'status': 'success',
            'action': action,
            'platform': platform,
            'deployment': deployment,
            'timestamp': '2025-11-16T00:00:00Z'
        }

        if action == 'rollback':
            result.update({
                'current_version': 'v1.2.4',
                'previous_version': 'v1.2.3',
                'target_version': target_version,
                'rollback_initiated': True,
                'rollback_completed': True,
                'rollback_strategy': strategy,
                'namespace': params.get('namespace', 'default'),
                'revision_from': 8,
                'revision_to': 7,
                'rollback_duration_seconds': 34.6,
                'pods_restarted': 3,
                'zero_downtime': params.get('max_unavailable', 0) == 0,
                'health_check_passed': True,
                'rollback_reason': params.get('reason', 'Manual rollback triggered'),
                'change_log': [
                    'Reverted configuration to v1.2.3',
                    'Rolled back 3 pods',
                    'Health checks passed',
                    'Traffic switched to previous version'
                ]
            })

        if action == 'list-versions':
            result['versions'] = [
                {
                    'version': 'v1.2.4',
                    'revision': 8,
                    'deployed_at': '2025-11-16T00:00:00Z',
                    'deployed_by': 'ci-pipeline',
                    'status': 'active',
                    'health': 'degraded'
                },
                {
                    'version': 'v1.2.3',
                    'revision': 7,
                    'deployed_at': '2025-11-15T00:00:00Z',
                    'deployed_by': 'ci-pipeline',
                    'status': 'previous',
                    'health': 'healthy'
                },
                {
                    'version': 'v1.2.2',
                    'revision': 6,
                    'deployed_at': '2025-11-14T00:00:00Z',
                    'deployed_by': 'manual',
                    'status': 'history',
                    'health': 'healthy'
                }
            ]
            result['total_versions'] = 3
            result['current_version'] = 'v1.2.4'

        if action == 'get-version':
            result.update({
                'version': 'v1.2.4',
                'revision': 8,
                'deployed_at': '2025-11-16T00:00:00Z',
                'deployed_by': 'ci-pipeline',
                'commit_sha': 'abc123def456',
                'image': 'registry.example.com/app:v1.2.4',
                'replicas': 3,
                'status': 'running',
                'health': 'degraded',
                'uptime_seconds': 3600,
                'configuration': {
                    'environment': 'production',
                    'resources': {'cpu': '500m', 'memory': '512Mi'}
                }
            })

        if action == 'set-version':
            result.update({
                'version_set': params.get('target_version'),
                'previous_version': 'v1.2.4',
                'new_version': params.get('target_version'),
                'deployment_triggered': True,
                'estimated_completion_seconds': 60
            })

        return result

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

        valid_platforms = ['kubernetes', 'aws', 'gcp', 'azure', 'heroku']
        platform = params.get('platform', 'kubernetes')
        if platform not in valid_platforms:
            self.logger.error(f"Invalid platform: {platform}")
            return False

        valid_actions = ['rollback', 'list-versions', 'get-version', 'set-version']
        action = params.get('action', 'rollback')
        if action not in valid_actions:
            self.logger.error(f"Invalid action: {action}")
            return False

        if action in ['rollback', 'set-version'] and 'target_version' not in params:
            self.logger.error("Missing required field: target_version")
            return False

        return True
