const { readPrintOptions } = require("./import-print.cjs");
const sides = new Set(["PrintTop", "PrintBottom", "PrintLeft", "PrintRight"]);

function updatePrintOptions(buffer, changes) {
  const output = Buffer.from(buffer),
    positions = new Map();
  readPrintOptions(output, (row, fields) => {
    const id = String(row.Index);
    if (positions.has(id)) throw Error("인쇄 서식 번호 중복");
    positions.set(id, fields);
  });
  for (const [id, values] of Object.entries(changes)) {
    if (
      !/^\d+$/.test(id) ||
      !positions.has(id) ||
      !values ||
      typeof values !== "object" ||
      Array.isArray(values)
    )
      throw Error(`인쇄 서식 변경 오류: ${id}`);
    for (const [name, value] of Object.entries(values)) {
      const field = positions.get(id)[name];
      if (
        sides.has(name) &&
        field?.kind === 4 &&
        field.width === 8 &&
        typeof value === "number" &&
        Number.isFinite(value) &&
        value >= 0 &&
        value <= 50
      )
        output.writeDoubleLE(value, field.at);
      else if (
        name === "PrintLineCount" &&
        field?.kind === 1 &&
        field.width === 4 &&
        Number.isInteger(value) &&
        value >= 1 &&
        value <= 100
      )
        output.writeInt32LE(value, field.at);
      else if (
        name === "PrintGongMethod" &&
        field?.kind === 1 &&
        field.width === 4 &&
        Number.isInteger(value) &&
        [0, 1, 2].includes(value)
      )
        output.writeInt32LE(value, field.at);
      else if (
        ["PrintApplyField", "PrintSumBottom"].includes(name) &&
        field?.kind === 3 &&
        field.width === 2 &&
        Number.isInteger(value) &&
        [0, 1].includes(value)
      )
        output.writeInt16LE(value, field.at);
      else throw Error(`인쇄 서식 ${id}.${name}: 저장할 수 없는 값`);
    }
  }
  const reread = new Map(readPrintOptions(output).map((row) => [String(row.Index), row]));
  for (const [id, values] of Object.entries(changes))
    for (const [key, value] of Object.entries(values))
      if (reread.get(id)?.[key] !== value) throw Error(`인쇄 서식 ${id}.${key} 검산 실패`);
  return output;
}
module.exports = { updatePrintOptions };