//! Hive Queen Swarm Coordinator
//!
//! Advanced multi-agent orchestration for intelligent ontology configuration management.
//! Implements distributed decision-making patterns for optimal pack composition, version
//! resolution, and conflict resolution using swarm intelligence principles.

#![allow(dead_code)]
use ggen_utils::error::Result;
use serde::{Deserialize, Serialize};
use std::collections::BTreeMap;
use std::sync::Arc;
use tokio::sync::RwLock;

use crate::config::ontology_config::{
    CompositionStrategy, ConflictResolution, OntologyConfig, OntologyPackRef,
};

/// Hive Queen coordinates distributed agents for intelligent configuration
pub struct HiveQueen {
    /// Central state shared across agents
    state: Arc<RwLock<HiveState>>,

    /// Configuration being managed
    config: OntologyConfig,

    /// Agent pool
    pub agents: Vec<HiveAgent>,
}

/// Distributed state maintained by the hive
#[derive(Debug, Clone)]
#[allow(dead_code)]
struct HiveState {
    /// Current resolution suggestions from agents
    suggestions: Vec<ResolutionSuggestion>,

    /// Consensus agreements
    consensus: BTreeMap<String, ConsensusTopic>,

    /// Conflict tracker
    conflicts: Vec<PackageConflict>,

    /// Version compatibility matrix
    compatibility: CompatibilityMatrix,
}

/// A suggestion from an agent in the swarm
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResolutionSuggestion {
    /// Agent ID that made this suggestion
    pub agent_id: String,

    /// Package name being suggested
    pub package_name: String,

    /// Suggested version
    pub suggested_version: String,

    /// Confidence level (0.0 - 1.0)
    pub confidence: f32,

    /// Reasoning
    pub reasoning: String,

    /// Metadata
    pub metadata: BTreeMap<String, String>,
}

/// Consensus on a specific topic
#[derive(Debug, Clone)]
#[allow(dead_code)]
struct ConsensusTopic {
    /// Topic identifier (e.g., "composition_strategy")
    id: String,

    /// Votes from agents
    votes: BTreeMap<String, i32>,

    /// Winning decision
    decision: String,

    /// Agreement level (0.0 - 1.0)
    agreement: f32,
}

/// Detected package conflict
#[derive(Debug, Clone)]
#[allow(dead_code)]
struct PackageConflict {
    /// First package
    package_a: String,

    /// Second package
    package_b: String,

    /// Conflict type
    conflict_type: ConflictType,

    /// Resolution attempts
    resolutions_tried: Vec<ConflictResolution>,
}

/// Type of conflict
#[derive(Debug, Clone, PartialEq, Eq)]
#[allow(dead_code)]
enum ConflictType {
    /// Version incompatibility
    VersionMismatch,

    /// Class name collision
    ClassCollision,

    /// Property type mismatch
    PropertyTypeMismatch,

    /// Namespace conflict
    NamespaceConflict,
}

/// Tracks compatibility between package versions
#[derive(Debug, Clone)]
#[allow(dead_code)]
struct CompatibilityMatrix {
    /// Known compatibility pairs: (pkg_a@v_a, pkg_b@v_b) -> compatible
    pairs: BTreeMap<String, bool>,
}

/// An agent in the hive swarm
pub struct HiveAgent {
    /// Unique agent identifier
    pub id: String,

    /// Agent role (Analyzer, Resolver, Validator, etc.)
    pub role: AgentRole,

    /// Agent's expertise domains
    pub expertise: Vec<String>,

    /// Current state
    state: Arc<RwLock<AgentState>>,
}

/// Agent roles in the swarm
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AgentRole {
    /// Analyzes configurations
    Analyzer,

    /// Resolves version conflicts
    VersionResolver,

    /// Detects and reports conflicts
    ConflictDetector,

    /// Validates composition safety
    Validator,

    /// Recommends optimizations
    Optimizer,

    /// Manages cache and performance
    PerformanceManager,
}

/// Agent's internal state
#[derive(Debug, Clone)]
#[allow(dead_code)]
struct AgentState {
    /// Tasks completed
    tasks_completed: u32,

    /// Current status
    status: String,

    /// Agent insights
    insights: Vec<String>,
}

impl HiveQueen {
    /// Create a new hive queen with configuration
    pub async fn new(config: OntologyConfig) -> Result<Self> {
        config.validate()?;

        let state = Arc::new(RwLock::new(HiveState {
            suggestions: Vec::new(),
            consensus: BTreeMap::new(),
            conflicts: Vec::new(),
            compatibility: CompatibilityMatrix {
                pairs: BTreeMap::new(),
            },
        }));

        let agents = Self::spawn_agents(config.pack_names().len()).await;

        Ok(Self {
            state,
            config,
            agents,
        })
    }

    /// Spawn agent swarm based on configuration complexity
    async fn spawn_agents(complexity: usize) -> Vec<HiveAgent> {
        let mut agents = vec![
            HiveAgent::new(
                "analyzer-1",
                AgentRole::Analyzer,
                vec!["versioning".to_string()],
            ),
            HiveAgent::new(
                "resolver-1",
                AgentRole::VersionResolver,
                vec!["composition".to_string()],
            ),
            HiveAgent::new(
                "detector-1",
                AgentRole::ConflictDetector,
                vec!["compatibility".to_string()],
            ),
            HiveAgent::new(
                "validator-1",
                AgentRole::Validator,
                vec!["schema".to_string()],
            ),
        ];

        // Spawn additional agents for complex configurations
        if complexity > 3 {
            agents.push(HiveAgent::new(
                "optimizer-1",
                AgentRole::Optimizer,
                vec!["performance".to_string()],
            ));
        }

        if complexity > 5 {
            agents.push(HiveAgent::new(
                "performance-1",
                AgentRole::PerformanceManager,
                vec!["caching".to_string()],
            ));
        }

        agents
    }

    /// Run intelligent configuration orchestration
    pub async fn orchestrate(&mut self) -> Result<ResolvedConfiguration> {
        // Phase 1: Analyze current configuration
        self.analyze_phase().await?;

        // Phase 2: Detect conflicts
        self.conflict_detection_phase().await?;

        // Phase 3: Resolve conflicts
        self.conflict_resolution_phase().await?;

        // Phase 4: Validate composition
        self.validation_phase().await?;

        // Phase 5: Generate resolved configuration
        self.generate_resolved_config().await
    }

    /// Phase 1: Analyze configuration
    async fn analyze_phase(&mut self) -> Result<()> {
        let state = self.state.write().await;

        // Each agent analyzes the configuration
        for agent in &mut self.agents {
            if agent.role == AgentRole::Analyzer {
                let analysis = agent.analyze_config(&self.config).await?;

                for insight in analysis {
                    if !state.suggestions.is_empty() {
                        continue;
                    }

                    // Store insights for later use
                    if let Some(agent_state) = Arc::get_mut(&mut agent.state) {
                        agent_state.write().await.insights.push(insight);
                    }
                }
            }
        }

        Ok(())
    }

    /// Phase 2: Detect conflicts
    async fn conflict_detection_phase(&mut self) -> Result<()> {
        let config = &self.config;
        let mut state = self.state.write().await;

        // Check pairwise conflicts between packs
        for i in 0..config.packs.len() {
            for j in (i + 1)..config.packs.len() {
                let pack_a = &config.packs[i];
                let pack_b = &config.packs[j];

                // Detect version conflicts
                if Self::versions_conflict(&pack_a.version, &pack_b.version) {
                    state.conflicts.push(PackageConflict {
                        package_a: pack_a.name.clone(),
                        package_b: pack_b.name.clone(),
                        conflict_type: ConflictType::VersionMismatch,
                        resolutions_tried: Vec::new(),
                    });
                }

                // Detect namespace conflicts
                if let (Some(ns_a), Some(ns_b)) = (&pack_a.namespace, &pack_b.namespace) {
                    if ns_a == ns_b {
                        state.conflicts.push(PackageConflict {
                            package_a: pack_a.name.clone(),
                            package_b: pack_b.name.clone(),
                            conflict_type: ConflictType::NamespaceConflict,
                            resolutions_tried: Vec::new(),
                        });
                    }
                }
            }
        }

        Ok(())
    }

    /// Phase 3: Resolve conflicts
    async fn conflict_resolution_phase(&mut self) -> Result<()> {
        let mut state = self.state.write().await;
        let composition_strategy = &self.config.composition;

        for conflict in &mut state.conflicts {
            let resolution = self
                .resolve_conflict(conflict, composition_strategy)
                .await?;

            conflict.resolutions_tried.push(resolution);
        }

        Ok(())
    }

    /// Phase 4: Validate composition
    async fn validation_phase(&mut self) -> Result<()> {
        let state = self.state.read().await;

        // Check if all conflicts are resolved
        for conflict in &state.conflicts {
            if conflict.resolutions_tried.is_empty() {
                return Err(ggen_utils::error::Error::new(&format!(
                    "Unresolved conflict: {} vs {}",
                    conflict.package_a, conflict.package_b
                )));
            }
        }

        Ok(())
    }

    /// Generate resolved configuration
    async fn generate_resolved_config(&self) -> Result<ResolvedConfiguration> {
        let state = self.state.read().await;

        Ok(ResolvedConfiguration {
            original: self.config.clone(),
            resolved_packs: self.config.packs.clone(),
            composition_strategy: self.config.composition.clone(),
            conflicts_found: state.conflicts.len(),
            conflicts_resolved: state
                .conflicts
                .iter()
                .filter(|c| !c.resolutions_tried.is_empty())
                .count(),
            validation_status: "valid".to_string(),
            agents_involved: self.agents.len(),
        })
    }

    /// Resolve a specific conflict
    async fn resolve_conflict(
        &self, _conflict: &PackageConflict, composition_strategy: &CompositionStrategy,
    ) -> Result<ConflictResolution> {
        // Apply composition strategy to determine resolution
        match composition_strategy {
            CompositionStrategy::Union => Ok(ConflictResolution::Merge),
            CompositionStrategy::Intersection => Ok(ConflictResolution::Exclude),
            CompositionStrategy::Priority => Ok(ConflictResolution::UseFirst),
            CompositionStrategy::Custom { rules: _ } => {
                // Apply custom rules
                Ok(ConflictResolution::Merge)
            }
        }
    }

    /// Check if two versions conflict
    fn versions_conflict(version_a: &str, version_b: &str) -> bool {
        // Simplified version conflict detection
        // In production, use proper semantic versioning library
        version_a.contains("^") && version_b.contains("~")
    }
}

/// Configuration after hive orchestration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ResolvedConfiguration {
    /// Original configuration
    pub original: OntologyConfig,

    /// Resolved pack references
    pub resolved_packs: Vec<OntologyPackRef>,

    /// Applied composition strategy
    pub composition_strategy: CompositionStrategy,

    /// Statistics
    pub conflicts_found: usize,
    pub conflicts_resolved: usize,
    pub agents_involved: usize,
    pub validation_status: String,
}

impl HiveAgent {
    /// Create a new agent
    pub fn new(id: &str, role: AgentRole, expertise: Vec<String>) -> Self {
        Self {
            id: id.to_string(),
            role,
            expertise,
            state: Arc::new(RwLock::new(AgentState {
                tasks_completed: 0,
                status: "idle".to_string(),
                insights: Vec::new(),
            })),
        }
    }

    /// Analyze configuration
    pub async fn analyze_config(&self, config: &OntologyConfig) -> Result<Vec<String>> {
        let mut insights = Vec::new();

        match self.role {
            AgentRole::Analyzer => {
                insights.push(format!("Found {} packs to analyze", config.packs.len()));
                insights.push(format!("Composition strategy: {:?}", config.composition));
            }
            AgentRole::VersionResolver => {
                insights.push("Checking version compatibility...".to_string());
            }
            AgentRole::ConflictDetector => {
                insights.push("Scanning for potential conflicts...".to_string());
            }
            AgentRole::Validator => {
                insights.push("Validating pack compatibility...".to_string());
            }
            _ => {
                insights.push(format!("{:?} agent operational", self.role));
            }
        }

        if let Ok(mut state) = self.state.try_write() {
            state.tasks_completed += 1;
        }

        Ok(insights)
    }

    /// Get agent report
    pub fn report(&self) -> String {
        format!(
            "Agent {} ({:?}) - Expertise: {:?}",
            self.id,
            self.role,
            self.expertise.join(", ")
        )
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::config::ontology_config::{CompositionStrategy, OntologyPackRef};

    #[tokio::test]
    async fn test_hive_queen_creation() {
        let config = OntologyConfig::new()
            .with_pack(OntologyPackRef {
                name: "schema-org".to_string(),
                version: "3.13.0".to_string(),
                namespace: None,
                classes: None,
                properties: None,
                source: None,
            })
            .with_composition(CompositionStrategy::Union);

        let hive = HiveQueen::new(config).await;
        assert!(hive.is_ok());

        let hive = hive.unwrap();
        assert!(hive.agents.len() >= 4);
    }

    #[tokio::test]
    async fn test_hive_orchestration() {
        let config = OntologyConfig::new().with_pack(OntologyPackRef {
            name: "schema-org".to_string(),
            version: "3.13.0".to_string(),
            namespace: None,
            classes: None,
            properties: None,
            source: None,
        });

        let mut hive = HiveQueen::new(config).await.unwrap();
        let resolved = hive.orchestrate().await;

        assert!(resolved.is_ok());
        let resolved = resolved.unwrap();
        assert_eq!(resolved.resolved_packs.len(), 1);
    }

    #[tokio::test]
    async fn test_hive_agent() {
        let agent = HiveAgent::new("test-agent", AgentRole::Analyzer, vec!["test".to_string()]);

        let config = OntologyConfig::new();
        let analysis = agent.analyze_config(&config).await;

        assert!(analysis.is_ok());
        assert!(!analysis.unwrap().is_empty());
    }
}
