import { readFileSync, watchFile, existsSync } from "fs";

const OUTPUT_FILE = "output/scraped-pos.json";
const PROGRESS_FILE = "output/progress.json";
const POLL_MS = 5000;

let lastCount = 0;

function classify(description) {
  if (!description) return null;
  const d = description.toLowerCase();
  if (!d.includes("plumbing")) return null;
  if (d.includes("plumbing pm") || d.includes("pm and corrective")) return "PM";
  return "Reactive";
}

function extractSite(record) {
  if (record.site_code) return record.site_code;
  for (const li of record.line_items || []) {
    if (!li.description) continue;
    const m = li.description.match(/^([A-Z]{1,4}[0-9]{1,2}|[A-Z]{4,5})\b/);
    if (m) return m[1];
  }
  if (record.ship_to_raw) {
    const m = record.ship_to_raw.match(/\(([A-Z0-9]{3,5})\)/);
    if (m) return m[1];
  }
  return "Unknown";
}

function analyze() {
  if (!existsSync(OUTPUT_FILE)) {
    console.log("Waiting for scrape output...");
    return;
  }

  let data;
  try {
    data = JSON.parse(readFileSync(OUTPUT_FILE, "utf-8"));
  } catch {
    return;
  }

  if (data.length === lastCount) return;
  lastCount = data.length;

  let progress = {};
  if (existsSync(PROGRESS_FILE)) {
    try {
      progress = JSON.parse(readFileSync(PROGRESS_FILE, "utf-8"));
    } catch {}
  }

  const sites = {};
  let pmTotal = 0;
  let reactiveTotal = 0;
  let pmCount = 0;
  let reactiveCount = 0;
  let nonPlumbing = 0;
  const plumbingPOs = [];

  for (const record of data) {
    let isPlumbing = false;
    let category = null;

    for (const li of record.line_items || []) {
      const cat = classify(li.description);
      if (cat) {
        isPlumbing = true;
        category = cat;
        break;
      }
    }

    if (!isPlumbing) {
      nonPlumbing++;
      continue;
    }

    const site = extractSite(record);
    const amount = parseFloat(
      (record.line_items[0]?.total || "0").replace(/,/g, "")
    );

    if (!sites[site]) sites[site] = { pm: 0, reactive: 0, pmCount: 0, reactiveCount: 0 };

    if (category === "PM") {
      sites[site].pm += amount;
      sites[site].pmCount++;
      pmTotal += amount;
      pmCount++;
    } else {
      sites[site].reactive += amount;
      sites[site].reactiveCount++;
      reactiveTotal += amount;
      reactiveCount++;
    }

    plumbingPOs.push({ po: record.po_number, site, category, amount });
  }

  // Clear screen and print dashboard
  console.clear();
  console.log("╔══════════════════════════════════════════════════════════════╗");
  console.log("║           COUPA PO SCRAPER — LIVE PLUMBING MONITOR         ║");
  console.log("╚══════════════════════════════════════════════════════════════╝");
  console.log();
  console.log(`  Scraped: ${data.length} / 4,192 POs  (${Object.keys(progress).length} completed)`);
  console.log(`  Plumbing: ${pmCount + reactiveCount} POs  |  Non-plumbing: ${nonPlumbing}`);
  console.log();
  console.log("  ┌──────────────┬──────────────────┬──────────────────┬──────────────────┐");
  console.log("  │ Category     │ PO Count         │ Spend            │ Avg per PO       │");
  console.log("  ├──────────────┼──────────────────┼──────────────────┼──────────────────┤");
  console.log(
    `  │ PM           │ ${String(pmCount).padStart(16)} │ $${pmTotal.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │ $${(pmCount ? pmTotal / pmCount : 0).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │`
  );
  console.log(
    `  │ Reactive     │ ${String(reactiveCount).padStart(16)} │ $${reactiveTotal.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │ $${(reactiveCount ? reactiveTotal / reactiveCount : 0).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │`
  );
  const total = pmTotal + reactiveTotal;
  const totalCount = pmCount + reactiveCount;
  console.log("  ├──────────────┼──────────────────┼──────────────────┼──────────────────┤");
  console.log(
    `  │ TOTAL        │ ${String(totalCount).padStart(16)} │ $${total.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │ $${(totalCount ? total / totalCount : 0).toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │`
  );
  console.log("  └──────────────┴──────────────────┴──────────────────┴──────────────────┘");

  // Top sites
  const sortedSites = Object.entries(sites)
    .map(([site, d]) => ({ site, total: d.pm + d.reactive, ...d }))
    .sort((a, b) => b.total - a.total);

  if (sortedSites.length > 0) {
    console.log();
    console.log("  Top 15 Sites:");
    console.log("  ┌──────────┬──────────────────┬──────────────────┬──────────────────┐");
    console.log("  │ Site     │ PM Spend         │ Reactive Spend   │ Total            │");
    console.log("  ├──────────┼──────────────────┼──────────────────┼──────────────────┤");
    for (const s of sortedSites.slice(0, 15)) {
      console.log(
        `  │ ${s.site.padEnd(8)} │ $${s.pm.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │ $${s.reactive.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │ $${s.total.toLocaleString("en-US", { minimumFractionDigits: 2, maximumFractionDigits: 2 }).padStart(15)} │`
      );
    }
    console.log("  └──────────┴──────────────────┴──────────────────┴──────────────────┘");
  }

  // Last 5 plumbing POs scraped
  if (plumbingPOs.length > 0) {
    console.log();
    console.log("  Last 5 plumbing POs:");
    for (const p of plumbingPOs.slice(-5)) {
      console.log(`    ${p.po}  ${p.site.padEnd(8)}  ${p.category.padEnd(10)}  $${p.amount.toLocaleString()}`);
    }
  }

  console.log();
  console.log(`  Last updated: ${new Date().toLocaleTimeString()}`);
  console.log("  Press Ctrl+C to stop monitoring.");
}

// Run immediately, then poll
analyze();
setInterval(analyze, POLL_MS);