import * as XLSX from "xlsx";
import type { AnalysisResult } from "./types.ts";

function buildRow(r: AnalysisResult) {
  const price = r.product.keepa?.currentPrice ?? r.product.spApi.estimatedSalePrice;
  const rank = r.product.keepa?.salesRank ?? r.product.record.amazonRank;

  return {
    ASIN: r.product.record.asin,
    Name: r.product.record.name,
    Brand: r.product.record.brand ?? "",
    Category: r.product.record.category ?? r.product.keepa?.categoryTree?.join(" > ") ?? "",
    "Unit Cost": r.product.record.unitCost,
    "Current Price": price ?? "",
    "Avg Price 90d": r.product.keepa?.avgPrice90 ?? "",
    "Sales Rank": rank ?? "",
    "Rank Avg 90d": r.product.keepa?.salesRankAvg90 ?? "",
    Sellers: r.product.keepa?.sellerCount ?? "",
    "Monthly Sold": r.product.keepa?.monthlySold ?? "",
    "Rank Drops 30d": r.product.keepa?.salesRankDrops30 ?? "",
    "Rank Drops 90d": r.product.keepa?.salesRankDrops90 ?? "",
    "FBA Net (sheet)": r.product.record.fbaNet ?? "",
    "Gross Profit $": r.product.record.grossProfit ?? "",
    "Gross Profit %": r.product.record.grossProfitPct ?? "",
    MOQ: r.product.record.moq ?? "",
    "MOQ Cost": r.product.record.moqCost ?? "",
    "Qty Available": r.product.record.totalQtyAvail ?? "",
    "FBA Fee": r.product.spApi.fbaFee,
    "FBM Fee": r.product.spApi.fbmFee,
    "Referral %": r.product.spApi.referralFeePercent,
    Verdict: r.verdict.verdict,
    Confidence: r.verdict.confidence,
    Reasoning: r.verdict.reasoning,
  };
}

export function printResults(results: AnalysisResult[]): void {
  const rows = results.map((r) => {
    const row = buildRow(r);
    return {
      ...row,
      Name: row.Name.slice(0, 40),
      Category: String(row.Category).slice(0, 20),
      Reasoning: row.Reasoning.slice(0, 60),
    };
  });

  console.log("\n=== Analysis Results ===\n");
  console.table(rows);

  const summary = {
    FBA: results.filter((r) => r.verdict.verdict === "FBA").length,
    FBM: results.filter((r) => r.verdict.verdict === "FBM").length,
    SKIP: results.filter((r) => r.verdict.verdict === "SKIP").length,
  };
  console.log(`\nSummary: ${summary.FBA} FBA | ${summary.FBM} FBM | ${summary.SKIP} SKIP out of ${results.length} products\n`);
}

export function writeResultsCsv(results: AnalysisResult[], outputPath: string): void {
  const rows = results.map(buildRow);

  const ws = XLSX.utils.json_to_sheet(rows);
  const wb = XLSX.utils.book_new();
  XLSX.utils.book_append_sheet(wb, ws, "Results");
  XLSX.writeFile(wb, outputPath);
  console.log(`Results written to ${outputPath}`);
}