import db from '../../config/database';
import { logger } from '../../utils/logger';
import { MultiTenantCore } from '../Tenant/MultiTenantCore';

export interface AdCampaign {
  id?: number;
  tenant_id: string;
  platform: 'FACEBOOK' | 'GOOGLE' | 'TIKTOK';
  campaign_id: string;
  name: string;
  status: 'ACTIVE' | 'PAUSED' | 'ARCHIVED';
  daily_budget: number;
  spent: number;
  roas: number;
  conversions: number;
  last_optimized_at?: Date;
}

/**
 * [BIZ_MKT_20] AGI 广告管家与预算动态优化服务
 * @description 核心逻辑：跨平台广告计划管理、基于 ROAS 的实时预算调优
 */
export class AdOpsService {
  private static TABLE_NAME = 'cf_ad_campaigns';

  /**
   * 初始化数据库表
   */
  static async initTable() {
    const hasTable = await db.schema.hasTable(this.TABLE_NAME);
    if (!hasTable) {
      logger.info(`📦 Creating ${this.TABLE_NAME} table...`);
      await db.schema.createTable(this.TABLE_NAME, (table) => {
        table.increments('id').primary();
        table.string('tenant_id', 50).notNullable().index();
        table.string('platform', 20).notNullable();
        table.string('campaign_id', 100).notNullable().unique();
        table.string('name', 200);
        table.string('status', 20).defaultTo('ACTIVE');
        table.decimal('daily_budget', 15, 2).defaultTo(0);
        table.decimal('spent', 15, 2).defaultTo(0);
        table.decimal('roas', 10, 2).defaultTo(0);
        table.integer('conversions').defaultTo(0);
        table.timestamp('last_optimized_at').nullable();
        table.timestamps(true, true);
        table.index(['tenant_id', 'platform']);
      });
    }
  }

  /**
   * 获取租户的所有广告计划
   */
  static async getCampaigns(tenantId: string, platform?: string) {
    let query = MultiTenantCore.from(tenantId, this.TABLE_NAME);
    if (platform) query = query.where({ platform });
    return query.select('*');
  }

  /**
   * [AGI_AD_OPTIMIZE] 自动预算调优逻辑
   * @description 如果 ROAS > 阈值，则增加预算；如果 ROAS < 阈值，则降低预算或暂停
   */
  static async autoOptimizeBudget(tenantId: string, campaignId: string) {
    const campaign = await MultiTenantCore.from(tenantId, this.TABLE_NAME)
      .where({ campaign_id: campaignId })
      .first();

    if (!campaign) throw new Error('Campaign not found');

    logger.info(`[AdOps] Optimizing budget for Campaign: ${campaign.name} (ROAS: ${campaign.roas})`);

    let newBudget = campaign.daily_budget;
    let action = 'NO_CHANGE';

    // AGI 调优策略 (示例)
    if (campaign.roas > 4.0) {
      newBudget = campaign.daily_budget * 1.2; // 增加 20%
      action = 'INCREASE_BUDGET';
    } else if (campaign.roas < 1.5 && campaign.spent > 50) {
      newBudget = campaign.daily_budget * 0.8; // 降低 20%
      action = 'DECREASE_BUDGET';
    }

    if (newBudget !== campaign.daily_budget) {
      await MultiTenantCore.from(tenantId, this.TABLE_NAME)
        .where({ campaign_id: campaignId })
        .update({
          daily_budget: newBudget,
          last_optimized_at: new Date()
        });
      
      logger.info(`[AdOps] ${action}: New budget for ${campaign.name} is ${newBudget}`);
    }

    return { campaignId, oldBudget: campaign.daily_budget, newBudget, action };
  }

  /**
   * 同步第三方平台数据 (Mock Implementation)
   */
  static async syncPlatformData(tenantId: string, platform: string) {
    logger.info(`[AdOps] Syncing ${platform} data for tenant: ${tenantId}`);
    
    // 模拟从 API 获取数据并更新数据库
    const mockCampaigns = [
      { campaign_id: `FB_${Math.random().toString(36).substr(2, 9)}`, name: 'Summer Sale 2026', spent: 120.5, roas: 4.2, conversions: 15 },
      { campaign_id: `FB_${Math.random().toString(36).substr(2, 9)}`, name: 'New Arrivals Retargeting', spent: 45.0, roas: 1.2, conversions: 2 }
    ];

    for (const mock of mockCampaigns) {
      await db(this.TABLE_NAME)
        .insert({
          tenant_id: tenantId,
          platform,
          ...mock,
          daily_budget: 50.0,
          status: 'ACTIVE'
        })
        .onConflict('campaign_id')
        .merge();
    }
  }
}
