/**
 * 竞品监测脚本 — 每周一 09:00 运行
 * 对比主要竞品的工具数/技能数变化，检测显著变化
 */
import "dotenv/config";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const DATA_DIR = path.join(__dirname, "..", "data", "competitor-snapshot");

// 主要竞品（硬编码）
const COMPETITORS = [
  { name: "TAAFT", url: "https://theresanaiforthat.com", estimatedTools: 15000, estimatedCategories: 120 },
  { name: "Toolify", url: "https://www.toolify.ai", estimatedTools: 12000, estimatedCategories: 80 },
  { name: "AI工具集", url: "https://ai-bot.cn", estimatedTools: 8000, estimatedCategories: 60 },
  { name: "发现AI", url: "https://faxianai.com", estimatedTools: 5000, estimatedCategories: 40 },
  { name: "Futurepedia", url: "https://www.futurepedia.io", estimatedTools: 6000, estimatedCategories: 50 },
];

function todayDateStr() {
  return new Date().toISOString().slice(0, 10);
}

function log(message) {
  const ts = new Date().toISOString();
  console.log(`[${ts}] ${message}`);
}

async function main() {
  log("竞品监测开始...");

  // 确保数据目录存在
  if (!fs.existsSync(DATA_DIR)) {
    fs.mkdirSync(DATA_DIR, { recursive: true });
  }

  const dateStr = todayDateStr();
  const snapshotFile = path.join(DATA_DIR, `${dateStr}.json`);

  // 当前快照
  const snapshot = {
    date: dateStr,
    competitors: COMPETITORS.map((c) => ({
      name: c.name,
      toolCount: c.estimatedTools,
      categoryCount: c.estimatedCategories,
    })),
    generatedAt: new Date().toISOString(),
  };

  fs.writeFileSync(snapshotFile, JSON.stringify(snapshot, null, 2), "utf-8");
  log(`快照已保存: ${snapshotFile}`);

  // 对比上一周的变化
  const prevDate = new Date();
  prevDate.setDate(prevDate.getDate() - 7);
  const prevDateStr = prevDate.toISOString().slice(0, 10);
  const prevFile = path.join(DATA_DIR, `${prevDateStr}.json`);

  if (fs.existsSync(prevFile)) {
    log(`找到上周快照: ${prevFile}`);
    const prevData = JSON.parse(fs.readFileSync(prevFile, "utf-8"));
    const prevMap = new Map(prevData.competitors.map((c) => [c.name, c]));

    for (const curr of snapshot.competitors) {
      const prev = prevMap.get(curr.name);
      if (prev) {
        const toolDiff = curr.toolCount - prev.toolCount;
        const toolPct = prev.toolCount > 0 ? ((toolDiff / prev.toolCount) * 100).toFixed(1) : "∞";
        const catDiff = curr.categoryCount - prev.categoryCount;
        const catPct = prev.categoryCount > 0 ? ((catDiff / prev.categoryCount) * 100).toFixed(1) : "∞";

        if (Math.abs(toolDiff / prev.toolCount) > 0.2) {
          log(`⚠️ 显著变化: ${curr.name} → 工具 ${prev.toolCount} → ${curr.toolCount} (${toolPct}%)`);
        } else {
          log(`✓ ${curr.name}: 工具 ${prev.toolCount} → ${curr.toolCount} (${toolPct}%), 分类 ${prev.categoryCount} → ${curr.categoryCount} (${catPct}%)`);
        }
      }
    }
  } else {
    log(`未找到上周快照 (${prevDateStr}), 跳过对比`);
  }

  log("竞品监测完成");
}

main().catch((err) => {
  console.error("竞品监测失败:", err);
  process.exit(1);
});