/**
 * Multi-Agent Coordination System - Blackboard & Messaging
 */

import { createClient, RedisClientType } from "redis";
import { $ } from "bun";
import type {
  AgentRole,
  AgentMessage,
  BlackboardEntry,
  BlackboardSection,
  AgentState,
  CoordinationMetrics,
  SpawnCondition,
  ConsensusVote,
} from "./types";

function now(): string {
  return new Date().toISOString();
}

function generateId(): string {
  return Math.random().toString(36).slice(2, 10) + Date.now().toString(36);
}

async function getVaultSecret(path: string): Promise<Record<string, any>> {
  const initKeys = await Bun.file("/opt/vault/init-keys.json").json();
  const token = initKeys.root_token;
  const result = await $`curl -sk -H "X-Vault-Token: ${token}" https://127.0.0.1:8200/v1/secret/data/${path}`.json();
  return result.data.data;
}

// =============================================================================
// Blackboard System - Shared Memory for Agent Coordination
// =============================================================================

export class Blackboard {
  private redis!: RedisClientType;
  private taskId: string;
  private versionCounters: Map<string, number> = new Map();

  constructor(taskId: string) {
    this.taskId = taskId;
  }

  async connect(): Promise<void> {
    const creds = await getVaultSecret("services/dragonfly");
    this.redis = createClient({
      url: "redis://" + creds.host + ":" + creds.port,
      password: creds.password,
    });
    await this.redis.connect();
  }

  async disconnect(): Promise<void> {
    await this.redis.quit();
  }

  private key(section: BlackboardSection, entryKey: string): string {
    return `blackboard:${this.taskId}:${section}:${entryKey}`;
  }

  private sectionKey(section: BlackboardSection): string {
    return `blackboard:${this.taskId}:${section}`;
  }

  async write(section: BlackboardSection, entryKey: string, value: any, author: AgentRole): Promise<BlackboardEntry> {
    const fullKey = this.key(section, entryKey);
    const currentVersion = this.versionCounters.get(fullKey) || 0;
    const newVersion = currentVersion + 1;
    this.versionCounters.set(fullKey, newVersion);

    const entry: BlackboardEntry = {
      section,
      key: entryKey,
      value,
      author,
      version: newVersion,
      timestamp: now(),
    };

    await this.redis.hSet(this.sectionKey(section), entryKey, JSON.stringify(entry));
    await this.redis.rPush(`blackboard:${this.taskId}:history`, JSON.stringify({
      action: "WRITE",
      ...entry,
    }));

    // Increment metrics
    await this.redis.hIncrBy(`metrics:${this.taskId}`, "blackboard_writes", 1);

    return entry;
  }

  async read(section: BlackboardSection, entryKey: string): Promise<BlackboardEntry | null> {
    const data = await this.redis.hGet(this.sectionKey(section), entryKey);
    if (!data) return null;

    await this.redis.hIncrBy(`metrics:${this.taskId}`, "blackboard_reads", 1);
    return JSON.parse(data);
  }

  async readSection(section: BlackboardSection): Promise<BlackboardEntry[]> {
    const data = await this.redis.hGetAll(this.sectionKey(section));
    const entries: BlackboardEntry[] = [];
    for (const value of Object.values(data)) {
      entries.push(JSON.parse(value));
    }
    await this.redis.hIncrBy(`metrics:${this.taskId}`, "blackboard_reads", entries.length);
    return entries;
  }

  async getHistory(limit: number = 100): Promise<any[]> {
    const data = await this.redis.lRange(`blackboard:${this.taskId}:history`, -limit, -1);
    return data.map(d => JSON.parse(d));
  }

  // Consensus tracking
  async recordVote(vote: ConsensusVote): Promise<void> {
    await this.redis.rPush(`blackboard:${this.taskId}:votes:${vote.proposal_id}`, JSON.stringify(vote));
    await this.write("consensus", vote.proposal_id + ":" + vote.agent, vote, vote.agent);
  }

  async getVotes(proposalId: string): Promise<ConsensusVote[]> {
    const data = await this.redis.lRange(`blackboard:${this.taskId}:votes:${proposalId}`, 0, -1);
    return data.map(d => JSON.parse(d));
  }

  async checkConsensus(proposalId: string, requiredAgents: AgentRole[]): Promise<{ reached: boolean; votes: ConsensusVote[] }> {
    const votes = await this.getVotes(proposalId);
    const acceptVotes = votes.filter(v => v.vote === "ACCEPT");
    const rejectVotes = votes.filter(v => v.vote === "REJECT");

    // Consensus requires majority accept and no rejects from required agents
    const hasAllRequired = requiredAgents.every(agent =>
      votes.some(v => v.agent === agent)
    );

    const reached = hasAllRequired &&
      acceptVotes.length > rejectVotes.length &&
      rejectVotes.length === 0;

    return { reached, votes };
  }
}

// =============================================================================
// Direct Messaging System - Point-to-Point Communication
// =============================================================================

export class MessageBus {
  private redis!: RedisClientType;
  private subscriber!: RedisClientType;
  private taskId: string;
  private agentRole: AgentRole;
  private messageHandlers: Map<string, (msg: AgentMessage) => void> = new Map();

  constructor(taskId: string, agentRole: AgentRole) {
    this.taskId = taskId;
    this.agentRole = agentRole;
  }

  async connect(): Promise<void> {
    const creds = await getVaultSecret("services/dragonfly");
    const config = {
      url: "redis://" + creds.host + ":" + creds.port,
      password: creds.password,
    };

    this.redis = createClient(config);
    this.subscriber = createClient(config);

    await this.redis.connect();
    await this.subscriber.connect();

    // Subscribe to direct messages and broadcast
    await this.subscriber.subscribe(`msg:${this.taskId}:${this.agentRole}`, (message) => {
      this.handleMessage(JSON.parse(message));
    });
    await this.subscriber.subscribe(`msg:${this.taskId}:ALL`, (message) => {
      this.handleMessage(JSON.parse(message));
    });
  }

  async disconnect(): Promise<void> {
    await this.subscriber.unsubscribe();
    await this.subscriber.quit();
    await this.redis.quit();
  }

  private handleMessage(msg: AgentMessage): void {
    // Store in message log (fire-and-forget, errors ignored)
    this.redis.rPush(`msg:${this.taskId}:log`, JSON.stringify(msg)).catch(() => {});
    this.redis.hIncrBy(`metrics:${this.taskId}`, "total_messages", 1).catch(() => {});
    this.redis.hIncrBy(`metrics:${this.taskId}`, "direct_messages", 1).catch(() => {});

    // Call registered handlers
    for (const handler of this.messageHandlers.values()) {
      try {
        handler(msg);
      } catch (e) {
        console.error("Message handler error:", e);
      }
    }
  }

  onMessage(handlerId: string, handler: (msg: AgentMessage) => void): void {
    this.messageHandlers.set(handlerId, handler);
  }

  removeHandler(handlerId: string): void {
    this.messageHandlers.delete(handlerId);
  }

  async send(to: AgentRole | "ALL", type: AgentMessage["type"], payload: any, correlationId?: string): Promise<AgentMessage> {
    const msg: AgentMessage = {
      id: generateId(),
      from: this.agentRole,
      to,
      type,
      payload,
      timestamp: now(),
      correlation_id: correlationId,
    };

    await this.redis.publish(`msg:${this.taskId}:${to}`, JSON.stringify(msg));
    await this.redis.rPush(`msg:${this.taskId}:log`, JSON.stringify(msg));
    await this.redis.hIncrBy(`metrics:${this.taskId}`, "total_messages", 1);
    await this.redis.hIncrBy(`metrics:${this.taskId}`, "direct_messages", 1);

    return msg;
  }

  async getMessageLog(limit: number = 100): Promise<AgentMessage[]> {
    const data = await this.redis.lRange(`msg:${this.taskId}:log`, -limit, -1);
    return data.map(d => JSON.parse(d));
  }
}

// =============================================================================
// Agent State Manager
// =============================================================================

export class AgentStateManager {
  private redis!: RedisClientType;
  private taskId: string;

  constructor(taskId: string) {
    this.taskId = taskId;
  }

  async connect(): Promise<void> {
    const creds = await getVaultSecret("services/dragonfly");
    this.redis = createClient({
      url: "redis://" + creds.host + ":" + creds.port,
      password: creds.password,
    });
    await this.redis.connect();
  }

  async disconnect(): Promise<void> {
    await this.redis.quit();
  }

  async updateState(state: AgentState): Promise<void> {
    state.last_activity = now();
    await this.redis.hSet(`agents:${this.taskId}`, state.role, JSON.stringify(state));
  }

  async getState(role: AgentRole): Promise<AgentState | null> {
    const data = await this.redis.hGet(`agents:${this.taskId}`, role);
    return data ? JSON.parse(data) : null;
  }

  async getAllStates(): Promise<AgentState[]> {
    const data = await this.redis.hGetAll(`agents:${this.taskId}`);
    return Object.values(data).map(d => JSON.parse(d));
  }

  async isBlocked(role: AgentRole, thresholdSeconds: number): Promise<boolean> {
    const state = await this.getState(role);
    if (!state || !state.blocked_since) return false;

    const blockedDuration = (Date.now() - new Date(state.blocked_since).getTime()) / 1000;
    return blockedDuration > thresholdSeconds;
  }

  async detectStuckAgents(thresholdSeconds: number): Promise<AgentRole[]> {
    const states = await this.getAllStates();
    const stuckAgents: AgentRole[] = [];

    for (const state of states) {
      if (state.status === "COMPLETED" || state.status === "FAILED") continue;

      const lastActivity = new Date(state.last_activity).getTime();
      const inactivitySeconds = (Date.now() - lastActivity) / 1000;

      if (inactivitySeconds > thresholdSeconds) {
        stuckAgents.push(state.role);
      }
    }

    return stuckAgents;
  }
}

// =============================================================================
// Spawn Controller - Manages Conditional Agent Spawning
// =============================================================================

export class SpawnController {
  private redis!: RedisClientType;
  private taskId: string;
  private conditions: SpawnCondition[] = [];
  private gammaSpawned: boolean = false;

  constructor(taskId: string) {
    this.taskId = taskId;
  }

  async connect(): Promise<void> {
    const creds = await getVaultSecret("services/dragonfly");
    this.redis = createClient({
      url: "redis://" + creds.host + ":" + creds.port,
      password: creds.password,
    });
    await this.redis.connect();

    // Initialize default spawn conditions
    this.conditions = [
      {
        type: "STUCK",
        threshold: 30, // seconds
        current_value: 0,
        triggered: false,
        description: "Spawn GAMMA when agents are stuck for 30+ seconds",
      },
      {
        type: "CONFLICT",
        threshold: 3, // conflicts
        current_value: 0,
        triggered: false,
        description: "Spawn GAMMA when 3+ unresolved conflicts detected",
      },
      {
        type: "COMPLEXITY",
        threshold: 0.8, // complexity score
        current_value: 0,
        triggered: false,
        description: "Spawn GAMMA when task complexity exceeds 0.8",
      },
      {
        type: "SUCCESS",
        threshold: 1.0, // completion
        current_value: 0,
        triggered: false,
        description: "Spawn GAMMA to validate and finalize when task complete",
      },
    ];
  }

  async disconnect(): Promise<void> {
    await this.redis.quit();
  }

  async updateCondition(type: SpawnCondition["type"], value: number): Promise<SpawnCondition | null> {
    const condition = this.conditions.find(c => c.type === type);
    if (!condition) return null;

    condition.current_value = value;
    condition.triggered = value >= condition.threshold;

    await this.redis.hSet(`spawn:${this.taskId}:conditions`, type, JSON.stringify(condition));

    return condition;
  }

  async checkSpawnConditions(): Promise<{ shouldSpawn: boolean; reason: SpawnCondition | null }> {
    if (this.gammaSpawned) {
      return { shouldSpawn: false, reason: null };
    }

    for (const condition of this.conditions) {
      if (condition.triggered) {
        return { shouldSpawn: true, reason: condition };
      }
    }

    return { shouldSpawn: false, reason: null };
  }

  async markGammaSpawned(reason: SpawnCondition): Promise<void> {
    this.gammaSpawned = true;
    await this.redis.hSet(`metrics:${this.taskId}`, "gamma_spawned", "true");
    await this.redis.hSet(`metrics:${this.taskId}`, "gamma_spawn_reason", reason.type);
    await this.redis.hSet(`metrics:${this.taskId}`, "gamma_spawn_time", now());
  }

  isGammaSpawned(): boolean {
    return this.gammaSpawned;
  }

  getConditions(): SpawnCondition[] {
    return this.conditions;
  }
}

// =============================================================================
// Metrics Collector
// =============================================================================

export class MetricsCollector {
  private redis!: RedisClientType;
  private taskId: string;
  private startTime: number;

  constructor(taskId: string) {
    this.taskId = taskId;
    this.startTime = Date.now();
  }

  async connect(): Promise<void> {
    const creds = await getVaultSecret("services/dragonfly");
    this.redis = createClient({
      url: "redis://" + creds.host + ":" + creds.port,
      password: creds.password,
    });
    await this.redis.connect();

    await this.redis.hSet(`metrics:${this.taskId}`, {
      task_id: this.taskId,
      start_time: now(),
      total_messages: "0",
      direct_messages: "0",
      blackboard_writes: "0",
      blackboard_reads: "0",
      conflicts_detected: "0",
      conflicts_resolved: "0",
      gamma_spawned: "false",
      final_consensus: "false",
      performance_score: "0",
    });
  }

  async disconnect(): Promise<void> {
    await this.redis.quit();
  }

  async increment(metric: string, by: number = 1): Promise<void> {
    await this.redis.hIncrBy(`metrics:${this.taskId}`, metric, by);
  }

  async set(metric: string, value: string): Promise<void> {
    await this.redis.hSet(`metrics:${this.taskId}`, metric, value);
  }

  async getMetrics(): Promise<CoordinationMetrics> {
    const data = await this.redis.hGetAll(`metrics:${this.taskId}`);

    return {
      task_id: this.taskId,
      start_time: data.start_time || now(),
      end_time: data.end_time,
      total_messages: parseInt(data.total_messages || "0"),
      direct_messages: parseInt(data.direct_messages || "0"),
      blackboard_writes: parseInt(data.blackboard_writes || "0"),
      blackboard_reads: parseInt(data.blackboard_reads || "0"),
      conflicts_detected: parseInt(data.conflicts_detected || "0"),
      conflicts_resolved: parseInt(data.conflicts_resolved || "0"),
      gamma_spawned: data.gamma_spawned === "true",
      gamma_spawn_reason: data.gamma_spawn_reason,
      gamma_spawn_time: data.gamma_spawn_time,
      final_consensus: data.final_consensus === "true",
      performance_score: parseFloat(data.performance_score || "0"),
    };
  }

  async finalize(consensus: boolean): Promise<CoordinationMetrics> {
    const endTime = now();
    const elapsedMs = Date.now() - this.startTime;

    await this.redis.hSet(`metrics:${this.taskId}`, "end_time", endTime);
    await this.redis.hSet(`metrics:${this.taskId}`, "final_consensus", consensus ? "true" : "false");

    // Calculate performance score
    const metrics = await this.getMetrics();
    const messageEfficiency = Math.max(0, 1 - (metrics.total_messages / 100));
    const conflictPenalty = metrics.conflicts_detected * 0.1;
    const timePenalty = Math.min(0.5, elapsedMs / 120000);
    const consensusBonus = consensus ? 0.2 : 0;
    const gammaBonus = metrics.gamma_spawned && consensus ? 0.1 : (metrics.gamma_spawned ? -0.1 : 0);

    const score = Math.max(0, Math.min(1,
      0.5 + messageEfficiency * 0.2 - conflictPenalty - timePenalty + consensusBonus + gammaBonus
    ));

    await this.redis.hSet(`metrics:${this.taskId}`, "performance_score", score.toFixed(3));

    return this.getMetrics();
  }
}