import { logger } from '../../utils/logger';
import { FeatureGovernanceService } from '../governance/FeatureGovernanceService';
import db from '../../config/database';

export interface ComputeJob {
  jobId: string;
  tenantId: string;
  complexity: 'LOW' | 'MEDIUM' | 'HIGH' | 'CRITICAL';
  allocatedNodes: number;
  cpuLimit: number; // mCore
  memoryLimit: number; // MiB
  status: 'QUEUED' | 'RUNNING' | 'COMPLETED' | 'FAILED';
}

/**
 * [CORE_DEV_35] AGI 弹性算力动态编排 V2 (Elastic Compute V2)
 * @description 核心逻辑：针对多 Agent 协作产生的海量、异构算力需求，实现亚秒级的资源调度。
 * 系统根据 AGI 任务的认知复杂度（如：简单的 SKU 翻译 vs 复杂的全球供应链 RCA）
 * 动态调整算力配额，支持在 K8s/Edge 节点间执行“计算热迁移”，确保关键决策链路的零延迟响应。
 */
export class ElasticComputeServiceV2 {
  private static readonly JOBS_TABLE = 'cf_agi_compute_jobs';

  /**
   * 初始化表结构
   */
  static async initTable() {
    const hasTable = await db.schema.hasTable(this.JOBS_TABLE);
    if (!hasTable) {
      console.log(`📦 Creating ${this.JOBS_TABLE} table...`);
      await db.schema.createTable(this.JOBS_TABLE, (table) => {
        table.increments('id').primary();
        table.string('job_id', 64).notNullable().unique();
        table.string('tenant_id', 64).notNullable();
        table.string('complexity', 16);
        table.integer('allocated_nodes');
        table.integer('cpu_limit');
        table.integer('memory_limit');
        table.string('status', 16).defaultTo('QUEUED');
        table.timestamp('created_at').defaultTo(db.fn.now());
        table.index(['tenant_id', 'status']);
      });
      console.log(`✅ Table ${this.JOBS_TABLE} created`);
    }
  }

  /**
   * 申请算力资源并启动任务
   */
  static async scheduleAGIJob(params: {
    tenantId: string;
    complexity: ComputeJob['complexity'];
  }): Promise<string> {
    const jobId = `AGI-JOB-${Date.now()}`;
    
    // 1. 动态资源估算逻辑
    const config = this.estimateResourceNeeds(params.complexity);

    await db(this.JOBS_TABLE).insert({
      job_id: jobId,
      tenant_id: params.tenantId,
      complexity: params.complexity,
      allocated_nodes: config.nodes,
      cpu_limit: config.cpu,
      memory_limit: config.memory,
      status: 'RUNNING'
    });

    logger.info(`[ElasticCompute] Scheduled ${params.complexity} job ${jobId} with ${config.nodes} nodes for Tenant ${params.tenantId}`);
    
    // 2. 联动边缘 WASM 或 TEE 集群进行容器启动 (模拟)
    // await InfinityComputeService.provisionNodes(jobId, config);

    return jobId;
  }

  /**
   * 资源需求估算模型
   */
  private static estimateResourceNeeds(complexity: ComputeJob['complexity']) {
    switch (complexity) {
      case 'CRITICAL': return { nodes: 16, cpu: 8000, memory: 32768 };
      case 'HIGH': return { nodes: 4, cpu: 2000, memory: 8192 };
      case 'MEDIUM': return { nodes: 2, cpu: 1000, memory: 4096 };
      default: return { nodes: 1, cpu: 500, memory: 1024 };
    }
  }

  /**
   * 释放算力资源
   */
  static async completeJob(jobId: string) {
    await db(this.JOBS_TABLE).where({ job_id: jobId }).update({ status: 'COMPLETED' });
    logger.info(`[ElasticCompute] Resources released for job ${jobId}`);
  }
}
