/**
 * Simulation Runner
 *
 * Orchestrates multi-agent swarms to test AgentDB functionality
 */

import * as fs from 'fs';
import * as path from 'path';
import { performance } from 'perf_hooks';

interface SimulationOptions {
  config: string;
  verbosity: string;
  iterations: string;
  swarmSize: string;
  model: string;
  parallel: boolean;
  output: string;
  stream: boolean;
  optimize: boolean;
}

interface SimulationResult {
  scenario: string;
  startTime: number;
  endTime: number;
  duration: number;
  iterations: number;
  agents: number;
  success: number;
  failures: number;
  metrics: {
    opsPerSec: number;
    avgLatency: number;
    memoryUsage: number;
    errorRate: number;
  };
  details: any[];
}

export async function runSimulation(scenario: string, options: SimulationOptions): Promise<void> {
  const verbosity = parseInt(options.verbosity);

  if (verbosity >= 1) {
    console.log('🚀 AgentDB Simulation System v2.0.0');
    console.log('═'.repeat(70));
    console.log(`Scenario: ${scenario}`);
    console.log(`Config: ${options.config}`);
    console.log(`Model: ${options.model}`);
    console.log(`Swarm Size: ${options.swarmSize}`);
    console.log(`Iterations: ${options.iterations}`);
    console.log(`Parallel: ${options.parallel}`);
    console.log(`Streaming: ${options.stream}`);
    console.log(`Optimize: ${options.optimize}`);
    console.log('═'.repeat(70));
  }

  // Load scenario
  const scenarioPath = path.join(process.cwd(), 'simulation', 'scenarios', `${scenario}.ts`);
  if (!fs.existsSync(scenarioPath)) {
    console.error(`❌ Scenario not found: ${scenario}`);
    console.error(`   Path: ${scenarioPath}`);
    process.exit(1);
  }

  const startTime = performance.now();
  const result: SimulationResult = {
    scenario,
    startTime: Date.now(),
    endTime: 0,
    duration: 0,
    iterations: parseInt(options.iterations),
    agents: parseInt(options.swarmSize),
    success: 0,
    failures: 0,
    metrics: {
      opsPerSec: 0,
      avgLatency: 0,
      memoryUsage: 0,
      errorRate: 0
    },
    details: []
  };

  try {
    // Import and run scenario
    const scenarioModule = await import(scenarioPath);
    const scenarioRunner = scenarioModule.default;

    if (verbosity >= 2) {
      console.log(`\n🎯 Running scenario: ${scenario}\n`);
    }

    // Initialize swarm
    const swarmConfig = {
      size: parseInt(options.swarmSize),
      model: options.model,
      parallel: options.parallel,
      stream: options.stream,
      optimize: options.optimize,
      verbosity
    };

    // Run iterations
    for (let i = 0; i < parseInt(options.iterations); i++) {
      if (verbosity >= 2) {
        console.log(`\n📍 Iteration ${i + 1}/${options.iterations}`);
      }

      const iterationStart = performance.now();

      try {
        const iterationResult = await scenarioRunner.run(swarmConfig);
        const iterationEnd = performance.now();

        result.success++;
        result.details.push({
          iteration: i + 1,
          duration: iterationEnd - iterationStart,
          success: true,
          data: iterationResult
        });

        if (verbosity >= 3) {
          console.log(`   ✅ Iteration ${i + 1} completed in ${(iterationEnd - iterationStart).toFixed(2)}ms`);
          console.log(`   Result:`, JSON.stringify(iterationResult, null, 2));
        } else if (verbosity >= 2) {
          console.log(`   ✅ Completed in ${(iterationEnd - iterationStart).toFixed(2)}ms`);
        }
      } catch (error) {
        const iterationEnd = performance.now();
        result.failures++;
        result.details.push({
          iteration: i + 1,
          duration: iterationEnd - iterationStart,
          success: false,
          error: error instanceof Error ? error.message : String(error)
        });

        if (verbosity >= 1) {
          console.error(`   ❌ Iteration ${i + 1} failed:`, error);
        }
      }
    }

    const endTime = performance.now();
    result.endTime = Date.now();
    result.duration = endTime - startTime;

    // Calculate metrics
    const successfulIterations = result.details.filter(d => d.success);
    const totalDuration = successfulIterations.reduce((sum, d) => sum + d.duration, 0);
    result.metrics.avgLatency = totalDuration / successfulIterations.length;
    result.metrics.opsPerSec = (result.success / (result.duration / 1000));
    result.metrics.errorRate = result.failures / result.iterations;
    result.metrics.memoryUsage = process.memoryUsage().heapUsed / 1024 / 1024; // MB

    // Display results
    if (verbosity >= 1) {
      console.log('\n' + '═'.repeat(70));
      console.log('📊 SIMULATION RESULTS');
      console.log('═'.repeat(70));
      console.log(`Total Duration: ${(result.duration / 1000).toFixed(2)}s`);
      console.log(`Iterations: ${result.iterations}`);
      console.log(`Success: ${result.success} (${((result.success / result.iterations) * 100).toFixed(1)}%)`);
      console.log(`Failures: ${result.failures} (${((result.failures / result.iterations) * 100).toFixed(1)}%)`);
      console.log(`\nMetrics:`);
      console.log(`  Throughput: ${result.metrics.opsPerSec.toFixed(2)} ops/sec`);
      console.log(`  Avg Latency: ${result.metrics.avgLatency.toFixed(2)}ms`);
      console.log(`  Error Rate: ${(result.metrics.errorRate * 100).toFixed(2)}%`);
      console.log(`  Memory Usage: ${result.metrics.memoryUsage.toFixed(2)} MB`);
      console.log('═'.repeat(70));
    }

    // Save results
    const outputDir = path.join(process.cwd(), options.output);
    if (!fs.existsSync(outputDir)) {
      fs.mkdirSync(outputDir, { recursive: true });
    }

    const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
    const outputPath = path.join(outputDir, `${scenario}-${timestamp}.json`);
    fs.writeFileSync(outputPath, JSON.stringify(result, null, 2));

    if (verbosity >= 1) {
      console.log(`\n💾 Results saved to: ${outputPath}\n`);
    }

  } catch (error) {
    console.error('\n❌ Simulation failed:', error);
    process.exit(1);
  }
}

export async function listScenarios(): Promise<void> {
  const scenariosDir = path.join(process.cwd(), 'simulation', 'scenarios');

  if (!fs.existsSync(scenariosDir)) {
    console.log('No scenarios found. Create scenarios in simulation/scenarios/');
    return;
  }

  const files = fs.readdirSync(scenariosDir).filter(f => f.endsWith('.ts'));

  console.log('\n📋 Available Scenarios:\n');

  for (const file of files) {
    const scenarioName = file.replace('.ts', '');
    const scenarioPath = path.join(scenariosDir, file);

    try {
      const module = await import(scenarioPath);
      const description = module.default?.description || 'No description';
      console.log(`  ${scenarioName.padEnd(30)} - ${description}`);
    } catch (error) {
      console.log(`  ${scenarioName.padEnd(30)} - (Error loading)`);
    }
  }

  console.log('');
}

export async function initScenario(scenario: string, options: any): Promise<void> {
  const scenarioPath = path.join(process.cwd(), 'simulation', 'scenarios', `${scenario}.ts`);

  if (fs.existsSync(scenarioPath)) {
    console.error(`❌ Scenario already exists: ${scenario}`);
    return;
  }

  const template = getTemplate(options.template);
  fs.writeFileSync(scenarioPath, template);

  console.log(`✅ Created scenario: ${scenario}`);
  console.log(`   Path: ${scenarioPath}`);
  console.log(`   Template: ${options.template}`);
}

function getTemplate(templateName: string): string {
  const templates: Record<string, string> = {
    basic: `/**
 * Basic Simulation Scenario
 */

export default {
  description: 'Basic simulation scenario',

  async run(config: any) {
    // Your simulation logic here
    return {
      status: 'success',
      data: {}
    };
  }
};
`,
    swarm: `/**
 * Swarm Simulation Scenario
 */

export default {
  description: 'Multi-agent swarm simulation',

  async run(config: any) {
    const { swarmInit, agentSpawn } = await import('./swarms/coordinator.js');

    // Initialize swarm
    const swarm = await swarmInit({
      topology: 'mesh',
      maxAgents: config.size
    });

    // Spawn agents
    const agents = [];
    for (let i = 0; i < config.size; i++) {
      const agent = await agentSpawn({
        swarmId: swarm.id,
        type: 'worker',
        capabilities: ['agentdb']
      });
      agents.push(agent);
    }

    // Execute tasks
    const results = await Promise.all(
      agents.map(agent => agent.execute())
    );

    return {
      status: 'success',
      agents: agents.length,
      results
    };
  }
};
`
  };

  return templates[templateName] || templates.basic;
}