/**
 * Seed bank status data from BoA exports into DynamoDB.
 *
 * Usage:
 *   node scripts/seed-bank-status.js \
 *     --cleared "Bank Export.csv" \
 *     --outstanding "PrintIssuesForInquiry.csv" \
 *     --issued "Positive Pay Import original.csv"
 *
 * All flags are optional — supply whichever files you have.
 *
 * Updates existing payment records:
 *   - status:     overwritten to "Cleared" | "Outstanding" | "Issued"
 *   - paid_date:  date the check cleared (from Bank Export)
 */

import { readFileSync } from "fs";
import { parse } from "csv-parse/sync";
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import { DynamoDBDocumentClient, UpdateCommand } from "@aws-sdk/lib-dynamodb";

const TABLE_NAME = "PaymentsDashboard";
const ddb = DynamoDBDocumentClient.from(new DynamoDBClient());

function parseArgs() {
  const args = process.argv.slice(2);
  const result = {};
  for (let i = 0; i < args.length; i += 2) {
    const flag = args[i].replace(/^--/, "");
    result[flag] = args[i + 1];
  }
  return result;
}

function readCSV(filePath) {
  const text = readFileSync(filePath, "utf-8");
  return parse(text, { columns: true, skip_empty_lines: true, trim: true });
}

// Normalize short dates like "1/27/26" → "2026-01-27"
function toISODate(dateStr) {
  if (!dateStr) return null;
  dateStr = dateStr.trim();

  // Already ISO-ish: 04/13/2026
  let parts = dateStr.split("/");
  if (parts.length === 3) {
    let [mm, dd, yyyy] = parts;
    if (yyyy.length === 2) yyyy = `20${yyyy}`;
    return `${yyyy}-${mm.padStart(2, "0")}-${dd.padStart(2, "0")}`;
  }
  return null;
}

async function updateStatus(checkNumber, status, { paidDate, amount, issueDate, method } = {}) {
  const pk = `payment#${checkNumber}`;
  const expr = ["#status = :s"];
  const names = { "#status": "status" };
  const values = { ":s": status };

  if (paidDate) {
    expr.push("paid_date = :pd");
    values[":pd"] = paidDate;
  }
  if (amount != null) {
    expr.push("amount_usd = :amt");
    values[":amt"] = amount;
  }
  if (issueDate) {
    expr.push("send_payment_on = :sd");
    values[":sd"] = issueDate;
  }
  if (checkNumber) {
    expr.push("check_number = :cn");
    values[":cn"] = checkNumber;
  }
  if (method) {
    expr.push("#method = :m");
    names["#method"] = "method";
    values[":m"] = method;
  }

  await ddb.send(
    new UpdateCommand({
      TableName: TABLE_NAME,
      Key: { pk },
      UpdateExpression: `SET ${expr.join(", ")}`,
      ExpressionAttributeNames: names,
      ExpressionAttributeValues: values,
    })
  );
}

async function main() {
  const flags = parseArgs();
  const statusMap = new Map(); // checkNumber → { status, paidDate }

  // 1. Positive Pay Import (lowest priority) — "Issued"
  //    Format: check_number, date, ?, ?, amount (no headers)
  if (flags.issued) {
    console.log(`Reading positive pay import: ${flags.issued}`);
    const text = readFileSync(flags.issued, "utf-8");
    const rows = parse(text, { skip_empty_lines: true, trim: true });
    for (const row of rows) {
      const checkNumber = row[0]?.trim();
      if (!checkNumber) continue;
      const amount = parseFloat(String(row[4] || "0").replace(/,/g, ""));
      const issueDate = row[1]?.trim() || null;
      statusMap.set(checkNumber, { status: "Issued", paidDate: null, amount: isNaN(amount) ? 0 : amount, issueDate, method: "Check" });
    }
    console.log(`  ${rows.length} positive pay entries`);
  }

  // 2. Outstanding Issues (medium priority) — "Outstanding"
  if (flags.outstanding) {
    console.log(`Reading outstanding issues: ${flags.outstanding}`);
    const rows = readCSV(flags.outstanding);
    for (const row of rows) {
      const checkNumber = (row["Check Number"] || "").trim();
      if (!checkNumber) continue;
      const amount = parseFloat(String(row["Amount"] || "0").replace(/,/g, ""));
      const rawDate = (row["Issue Date"] || "").trim();
      // Normalize 2-digit year to 4-digit: "12/10/24" → "12/10/2024"
      let issueDate = rawDate || null;
      if (rawDate) {
        const parts = rawDate.split("/");
        if (parts.length === 3 && parts[2].length === 2) {
          parts[2] = `20${parts[2]}`;
          issueDate = parts.join("/");
        }
      }
      statusMap.set(checkNumber, { status: "Outstanding", paidDate: null, amount: isNaN(amount) ? 0 : amount, issueDate, method: "Check" });
    }
    console.log(`  ${rows.length} outstanding entries`);
  }

  // 3. Bank Export / Cleared (highest priority) — "Cleared"
  //    Duplicates exist (same check appears twice); just take the first paid date.
  if (flags.cleared) {
    console.log(`Reading bank export (cleared): ${flags.cleared}`);
    const rows = readCSV(flags.cleared);
    const seen = new Set();
    let deduped = 0;
    for (const row of rows) {
      const checkNumber = (row["Check Number"] || "").trim();
      if (!checkNumber) continue;
      if (seen.has(checkNumber)) {
        deduped++;
        continue;
      }
      seen.add(checkNumber);
      const paidDate = toISODate(row["Paid Date"] || row["CD Volume Number"] || "");
      const amount = parseFloat(String(row["Amount"] || "0").replace(/,/g, ""));
      statusMap.set(checkNumber, { status: "Cleared", paidDate, amount: isNaN(amount) ? 0 : amount });
    }
    console.log(`  ${seen.size} unique cleared checks (${deduped} duplicates skipped)`);
  }

  // Write to DynamoDB
  let count = 0;
  for (const [checkNumber, { status, paidDate, amount, issueDate, method }] of statusMap) {
    await updateStatus(checkNumber, status, { paidDate, amount, issueDate, method });
    count++;
  }

  console.log(`\nDone — ${count} payments updated with bank status.`);
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});