/**
 * UI fallback: if mail_record missing customer, extract from subject bl-plus
 */
import fs from "fs";

const path = "src/components/MailBusinessSummary.tsx";
let src = fs.readFileSync(path, "utf8");

if (!src.includes("extractBlPlusFromMail")) {
  const importNeedle = `import {
  extractForecastInstructionText,
  extractMailInstructions,
} from "@/services/parse/split-instructions";`;
  const importRepl = `import { extractBlPlusFromMail } from "@/services/parse/bl-plus-template";
import {
  extractForecastInstructionText,
  extractMailInstructions,
} from "@/services/parse/split-instructions";`;
  if (!src.includes(importNeedle)) throw new Error("import block missing");
  src = src.replace(importNeedle, importRepl);
}

const oldForecast = `  const forecastValue = useMemo(() => {
    const base = buildCcForecastFormValue({
      customerName: record?.modules.customer_name,
      header,
      modules: record?.modules,
    });
    return {
      ...base,
      F_Instruction: forecastInstruction || base.F_Instruction,
    };
  }, [
    header,
    record?.modules,
    record?.modules.customer_name,
    forecastInstruction,
  ]);`;

const neuForecast = `  const blPlusModules = useMemo(
    () => extractBlPlusFromMail(mail.subject, bodyText)?.modules ?? null,
    [mail.subject, bodyText],
  );

  const forecastValue = useMemo(() => {
    const modules = {
      ...(blPlusModules || {}),
      ...(record?.modules || {}),
    };
    const base = buildCcForecastFormValue({
      customerName:
        record?.modules.customer_name ||
        blPlusModules?.customer_name ||
        undefined,
      header,
      modules,
    });
    return {
      ...base,
      F_Instruction: forecastInstruction || base.F_Instruction,
    };
  }, [
    header,
    record?.modules,
    record?.modules.customer_name,
    blPlusModules,
    forecastInstruction,
  ]);`;

if (!src.includes(oldForecast)) {
  // CRLF
  const oldC = oldForecast.replace(/\n/g, "\r\n");
  if (!src.includes(oldC)) {
    console.error("forecastValue block missing");
    process.exit(1);
  }
  src = src.replace(oldC, neuForecast.replace(/\n/g, "\r\n"));
} else {
  src = src.replace(oldForecast, neuForecast);
}

fs.writeFileSync(path, src);
console.log("MailBusinessSummary customer fallback ok");