ggen 1.2.0

//! Simplified Agent System - Core Team Best Practices Implementation
//!
//! This module provides a maintainable, performant agent system that focuses
//! on the 80/20 principle: 20% of the code handles 80% of the value.
//!
//! # Simplified Architecture
//!
//! - **Agent Registry**: Centralized agent management
//! - **Message Passing**: Simple, reliable inter-agent communication
//! - **Task Coordination**: Lightweight task distribution
//! - **Knowledge Sharing**: Efficient knowledge transfer between agents

use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use uuid::Uuid;

/// Simplified agent trait - no async complexity
pub trait SimpleAgent: Send + Sync {
    fn id(&self) -> &str;
    fn specialization(&self) -> AgentSpecialization;
    fn execute_sync(&self, context: &AgentContext) -> AgentResult;
    fn coordinate_sync(&self, message: CoordinationMessage) -> AgentResult;
    fn status(&self) -> AgentStatus;
}

/// Agent specialization domains (simplified)
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum AgentSpecialization {
    LondonBdd,           // BDD orchestration
    Byzantene,           // Fault tolerance
    MarketIntelligence,  // Marketplace analytics
    SemanticAnalyst,     // Knowledge analysis
    SecuritySentinel,    // Security monitoring
    PerformanceGuardian, // Performance monitoring
}

/// Agent execution context
#[derive(Debug, Clone)]
pub struct AgentContext {
    pub request_id: Uuid,
    pub project_context: ProjectContext,
    pub execution_environment: ExecutionEnvironment,
}

/// Project context
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ProjectContext {
    pub project_id: String,
    pub project_type: String,
    pub technology_stack: Vec<String>,
}

/// Execution environment
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExecutionEnvironment {
    pub available_resources: ResourceAllocation,
    pub network_status: NetworkStatus,
}

/// Resource allocation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResourceAllocation {
    pub cpu_cores: u32,
    pub memory_mb: u64,
}

/// Network status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum NetworkStatus {
    Online,
    Limited,
    Offline,
}

/// Agent execution results
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AgentResult {
    pub success: bool,
    pub output: serde_json::Value,
    pub confidence: f64,
    pub execution_time_ms: u64,
    pub recommendations: Vec<String>,
}

/// Coordination messages
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CoordinationMessage {
    pub from_agent: String,
    pub to_agent: String,
    pub message_type: MessageType,
    pub payload: serde_json::Value,
    pub priority: Priority,
}

/// Message types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MessageType {
    StatusUpdate,
    TaskDelegation,
    KnowledgeShare,
    Coordination,
}

/// Priority levels
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub enum Priority {
    Low,
    Medium,
    High,
    Critical,
}

/// Agent status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AgentStatus {
    pub agent_id: String,
    pub specialization: AgentSpecialization,
    pub current_load: f64,
    pub health_score: f64,
    pub last_activity: chrono::DateTime<chrono::Utc>,
    pub active_tasks: Vec<String>,
}

/// Agent registry for managing all agents
pub struct AgentRegistry {
    agents: HashMap<String, Box<dyn SimpleAgent>>,
}

impl Default for AgentRegistry {
    fn default() -> Self {
        Self::new()
    }
}

impl AgentRegistry {
    pub fn new() -> Self {
        Self {
            agents: HashMap::new(),
        }
    }

    pub fn register(&mut self, agent: Box<dyn SimpleAgent>) {
        self.agents.insert(agent.id().to_string(), agent);
    }

    pub fn get(&self, id: &str) -> Option<&dyn SimpleAgent> {
        self.agents.get(id).map(|v| &**v)
    }

    pub fn list(&self) -> Vec<&str> {
        self.agents.keys().map(|s| s.as_str()).collect()
    }

    pub fn get_by_specialization(
        &self, specialization: &AgentSpecialization,
    ) -> Vec<&dyn SimpleAgent> {
        self.agents
            .values()
            .filter(|agent| agent.specialization() == *specialization)
            .map(|agent| &**agent)
            .collect()
    }
}

/// Message router for inter-agent communication
pub struct MessageRouter {
    message_queue: Vec<CoordinationMessage>,
}

impl Default for MessageRouter {
    fn default() -> Self {
        Self::new()
    }
}

impl MessageRouter {
    pub fn new() -> Self {
        Self {
            message_queue: Vec::new(),
        }
    }

    pub fn route_message(&mut self, message: CoordinationMessage) -> RoutingResult {
        self.message_queue.push(message.clone());

        RoutingResult {
            message_id: Uuid::new_v4().to_string(),
            delivered_to: vec![message.to_agent.clone()],
            delivery_successful: true,
            response_time_ms: 50,
        }
    }

    pub fn process_messages(&mut self, agents: &AgentRegistry) -> Vec<AgentResult> {
        let mut results = Vec::new();

        while let Some(message) = self.message_queue.pop() {
            if let Some(agent) = agents.get(&message.to_agent) {
                let result = agent.coordinate_sync(message);
                results.push(result);
            }
        }

        results
    }
}

/// Routing result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RoutingResult {
    pub message_id: String,
    pub delivered_to: Vec<String>,
    pub delivery_successful: bool,
    pub response_time_ms: u64,
}

/// Task coordinator for distributing work
pub struct TaskCoordinator {
    tasks: Vec<CoordinationTask>,
    #[allow(dead_code)]
    completed_tasks: Vec<String>,
}

impl Default for TaskCoordinator {
    fn default() -> Self {
        Self::new()
    }
}

impl TaskCoordinator {
    pub fn new() -> Self {
        Self {
            tasks: Vec::new(),
            completed_tasks: Vec::new(),
        }
    }

    pub fn add_task(&mut self, task: CoordinationTask) {
        self.tasks.push(task);
    }

    pub fn coordinate_tasks(&mut self, agents: &AgentRegistry) -> Vec<TaskResult> {
        let mut results = Vec::new();

        for task in &self.tasks {
            if let Some(agent) = self.select_agent_for_task(task, agents) {
                let context = AgentContext {
                    request_id: Uuid::new_v4(),
                    project_context: ProjectContext {
                        project_id: "ggen-marketplace".to_string(),
                        project_type: "library".to_string(),
                        technology_stack: vec!["rust".to_string()],
                    },
                    execution_environment: ExecutionEnvironment {
                        available_resources: ResourceAllocation {
                            cpu_cores: 4,
                            memory_mb: 8192,
                        },
                        network_status: NetworkStatus::Online,
                    },
                };

                let result = agent.execute_sync(&context);
                results.push(TaskResult {
                    task_id: task.id.clone(),
                    success: result.success,
                    execution_time_ms: result.execution_time_ms,
                    agent_used: agent.id().to_string(),
                });
            }
        }

        results
    }

    fn select_agent_for_task<'a>(
        &self, task: &CoordinationTask, agents: &'a AgentRegistry,
    ) -> Option<&'a dyn SimpleAgent> {
        agents
            .get_by_specialization(&task.required_specialization)
            .first()
            .copied()
    }
}

/// Coordination task
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CoordinationTask {
    pub id: String,
    pub task_type: String,
    pub priority: Priority,
    pub required_specialization: AgentSpecialization,
    pub input_data: serde_json::Value,
}

/// Task result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaskResult {
    pub task_id: String,
    pub success: bool,
    pub execution_time_ms: u64,
    pub agent_used: String,
}

/// Agent system status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SystemStatus {
    pub total_agents: usize,
    pub active_tasks: usize,
    pub system_health: f64,
    pub last_updated: chrono::DateTime<chrono::Utc>,
}

/// Agent system for simplified orchestration
pub struct AgentSystem {
    registry: AgentRegistry,
    message_router: MessageRouter,
    task_coordinator: TaskCoordinator,
}

impl Default for AgentSystem {
    fn default() -> Self {
        Self::new()
    }
}

impl AgentSystem {
    pub fn new() -> Self {
        Self {
            registry: AgentRegistry::new(),
            message_router: MessageRouter::new(),
            task_coordinator: TaskCoordinator::new(),
        }
    }

    pub fn register_agent(&mut self, agent: Box<dyn SimpleAgent>) {
        self.registry.register(agent);
    }

    pub fn get_status(&self) -> SystemStatus {
        SystemStatus {
            total_agents: self.registry.list().len(),
            active_tasks: self.task_coordinator.tasks.len(),
            system_health: 0.95, // Simplified for demo
            last_updated: chrono::Utc::now(),
        }
    }

    pub fn coordinate_task(&mut self, task: CoordinationTask) -> TaskResult {
        self.task_coordinator.add_task(task);
        let results = self.task_coordinator.coordinate_tasks(&self.registry);

        results.into_iter().next().unwrap_or_else(|| TaskResult {
            task_id: "unknown".to_string(),
            success: false,
            execution_time_ms: 0,
            agent_used: "none".to_string(),
        })
    }

    pub fn process_messages(&mut self) -> Vec<AgentResult> {
        self.message_router.process_messages(&self.registry)
    }
}

/// London BDD Agent (simplified implementation)
pub struct LondonBddAgent {
    id: String,
}

impl Default for LondonBddAgent {
    fn default() -> Self {
        Self::new()
    }
}

impl LondonBddAgent {
    pub fn new() -> Self {
        Self {
            id: "london-bdd-001".to_string(),
        }
    }
}

impl SimpleAgent for LondonBddAgent {
    fn id(&self) -> &str {
        &self.id
    }

    fn specialization(&self) -> AgentSpecialization {
        AgentSpecialization::LondonBdd
    }

    fn execute_sync(&self, _context: &AgentContext) -> AgentResult {
        AgentResult {
            success: true,
            output: serde_json::json!({"bdd_analysis": "completed"}),
            confidence: 0.95,
            execution_time_ms: 200,
            recommendations: vec!["Add more BDD scenarios".to_string()],
        }
    }

    fn coordinate_sync(&self, _message: CoordinationMessage) -> AgentResult {
        AgentResult {
            success: true,
            output: serde_json::json!({"coordination_acknowledged": true}),
            confidence: 1.0,
            execution_time_ms: 50,
            recommendations: vec![],
        }
    }

    fn status(&self) -> AgentStatus {
        AgentStatus {
            agent_id: self.id.clone(),
            specialization: AgentSpecialization::LondonBdd,
            current_load: 0.3,
            health_score: 0.95,
            last_activity: chrono::Utc::now(),
            active_tasks: vec!["bdd_orchestration".to_string()],
        }
    }
}

/// Byzantene Agent (simplified implementation)
pub struct ByzanteneAgent {
    id: String,
}

impl Default for ByzanteneAgent {
    fn default() -> Self {
        Self::new()
    }
}

impl ByzanteneAgent {
    pub fn new() -> Self {
        Self {
            id: "byzantene-001".to_string(),
        }
    }
}

impl SimpleAgent for ByzanteneAgent {
    fn id(&self) -> &str {
        &self.id
    }

    fn specialization(&self) -> AgentSpecialization {
        AgentSpecialization::Byzantene
    }

    fn execute_sync(&self, _context: &AgentContext) -> AgentResult {
        AgentResult {
            success: true,
            output: serde_json::json!({"fault_tolerance": "active"}),
            confidence: 0.98,
            execution_time_ms: 100,
            recommendations: vec!["Monitor agent health".to_string()],
        }
    }

    fn coordinate_sync(&self, _message: CoordinationMessage) -> AgentResult {
        AgentResult {
            success: true,
            output: serde_json::json!({"coordination_acknowledged": true}),
            confidence: 1.0,
            execution_time_ms: 50,
            recommendations: vec![],
        }
    }

    fn status(&self) -> AgentStatus {
        AgentStatus {
            agent_id: self.id.clone(),
            specialization: AgentSpecialization::Byzantene,
            current_load: 0.2,
            health_score: 0.98,
            last_activity: chrono::Utc::now(),
            active_tasks: vec!["fault_detection".to_string()],
        }
    }
}