const CHINESE_CODE_INITIALS = {
  产: "C",
  品: "P",
  原: "Y",
  料: "L",
  本: "B",
  体: "T",
  垃: "L",
  圾: "J",
  桶: "T",
  垫: "D",
  电: "D",
  脑: "N",
  支: "Z",
  架: "J",
  钢: "G",
  板: "B",
  卷: "J",
  铝: "L",
  合: "H",
  金: "J",
  铁: "T",
  铜: "T",
  不: "B",
  锈: "X",
  冷: "L",
  热: "R",
  轧: "Z",
  镀: "D",
  锌: "X",
  冲: "C",
  压: "Y",
  件: "J",
  片: "P",
  管: "G",
  棒: "B",
  圆: "Y",
  方: "F",
  型: "X",
  材: "C",
  外: "W",
  壳: "K",
  底: "D",
  座: "Z",
  盖: "G",
  盒: "H",
  箱: "X",
  门: "M",
  锁: "S",
  扣: "K",
  连: "L",
  接: "J"
};

function normalizeText(value) {
  return String(value || "").trim();
}

export function normalizeCodeToken(value, maxLength = 24) {
  const text = normalizeText(value).toUpperCase();
  if (!text) {
    return "";
  }

  const chunks = [];
  let current = "";
  let currentKind = "";

  const flushCurrent = () => {
    if (current) {
      chunks.push(current);
    }
    current = "";
    currentKind = "";
  };

  for (const char of text.replaceAll("×", "X").replaceAll("*", "X")) {
    let kind = "";
    let tokenChar = "";

    if (/^[A-Z0-9.]$/.test(char)) {
      kind = "LATIN";
      tokenChar = char;
    } else if (/^[\u4e00-\u9fff]$/.test(char)) {
      const mapped = CHINESE_CODE_INITIALS[char];
      if (mapped) {
        kind = "CJK";
        tokenChar = mapped;
      } else {
        kind = "CJK_RAW";
        tokenChar = char;
      }
    } else {
      flushCurrent();
      continue;
    }

    if (currentKind && currentKind !== kind) {
      flushCurrent();
    }
    currentKind = kind;
    current += tokenChar;
  }

  flushCurrent();
  return chunks.join("-").slice(0, maxLength).replace(/^[.-]+|[.-]+$/g, "");
}

function buildCodePrefix(parts, maxLength = 42) {
  const tokens = parts.map((part) => normalizeCodeToken(part)).filter(Boolean);
  if (!tokens.length) {
    return "";
  }
  return tokens.join("-").slice(0, maxLength).replace(/^[.-]+|[.-]+$/g, "");
}

export function buildNextProductSpecCode(products = []) {
  let maxNo = 0;
  for (const product of products || []) {
    const code = normalizeText(product?.item_code);
    const match = code.match(/^产品需规(\d{5})$/);
    if (match) {
      maxNo = Math.max(maxNo, Number(match[1]));
    }
  }
  return `产品需规${String(maxNo + 1).padStart(5, "0")}`;
}

export function buildProductCodePreview(form, savedCode = "", nextCode = "") {
  if (normalizeText(savedCode)) {
    return savedCode;
  }
  return normalizeText(nextCode) || "产品需规00001";
}

export function buildNextMaterialCode(materials = []) {
  let maxNo = 0;
  for (const material of materials || []) {
    const code = normalizeText(material?.item_code);
    const match = code.match(/^原材料(\d{5})$/);
    if (match) {
      maxNo = Math.max(maxNo, Number(match[1]));
    }
  }
  return `原材料${String(maxNo + 1).padStart(5, "0")}`;
}

export function buildMaterialCodePreview(form, savedCode = "", nextCode = "") {
  if (normalizeText(savedCode)) {
    return savedCode;
  }
  return normalizeText(nextCode) || "原材料00001";
}

export function buildBomCodePreview(productCode, savedCode = "") {
  if (normalizeText(savedCode)) {
    return savedCode;
  }
  const prefix = buildCodePrefix(["BOM", productCode || "产品编码"], 50) || "BOM-产品编码";
  return prefix;
}

export function buildRouteCodePreview(productCode, savedCode = "") {
  if (normalizeText(savedCode)) {
    return savedCode;
  }
  const prefix = buildCodePrefix(["ROUTE", productCode || "产品编码"], 50) || "ROUTE-产品编码";
  return prefix;
}