/**
 * # 脚本 导入产品属性术语顺序（对齐原站 /shop/ 筛选列表顺序）
 * 原站 WPC 筛选按 wp_term_taxonomy 中的术语顺序展示（取证：pa_product-type 顺序
 * SoM → IoT Gateway → Wi-Fi Repeater → Router → Beacon，对应 term_id 756/764/845/846/862；
 * pa_cpu 顺序 PX30 → RK3328 → RK3588 → PX30K …）。本项目导入时按字母序写入，需要修复。
 * 做法：解析 dump 的 wp_terms（term_id→name）与 wp_term_taxonomy（插入顺序），
 * 对每个 pa_<属性 slug>，按顺序把 product_attribute_values.sort 设为序号。
 * 运行：bun scripts/import-attribute-term-order.ts
 */
import { SQL } from "bun";

const DUMP = "/home/bigcode/data/dev/sites/dusuniot/legacy/dusuniot-db-20261029.sql";
const db = new SQL("postgres://dusuniot:dusuniot@127.0.0.1:25432/dusuniot");

/** # 函数 提取某张表的 INSERT 段文本（支持多段 INSERT） */
function tableInserts(lines: string[], table: string): string[] {
  const out: string[] = [];
  let buf = "";
  let on = false;
  for (const l of lines) {
    if (l.startsWith(`INSERT INTO \`${table}\` VALUES`)) {
      on = true;
      buf = l;
    } else if (on) {
      buf += l;
    }
    if (on && l.trimEnd().endsWith(";")) {
      out.push(buf);
      buf = "";
      on = false;
    }
  }
  return out;
}

/** # 函数 解析 SQL 值元组 */
function parseTuples(s: string): string[][] {
  const out: string[][] = [];
  let p = s.indexOf("(");
  while (p >= 0 && p < s.length) {
    const values: string[] = [];
    let cur = "";
    let inQ = false;
    let esc = false;
    let depth = 0;
    p++;
    for (; p < s.length; p++) {
      const ch = s[p]!;
      if (esc) { cur += ch; esc = false; continue; }
      if (inQ) {
        if (ch === "\\") { esc = true; continue; }
        if (ch === "'") { inQ = false; continue; }
        cur += ch;
        continue;
      }
      if (ch === "'") { inQ = true; continue; }
      if (ch === "(") { depth++; cur += ch; continue; }
      if (ch === ")") {
        if (depth === 0) { values.push(cur); cur = ""; p++; break; }
        depth--;
        cur += ch;
        continue;
      }
      if (ch === "," && depth === 0) { values.push(cur); cur = ""; continue; }
      cur += ch;
    }
    out.push(values);
    p = s.indexOf("(", p);
  }
  return out;
}

const lines = (await Bun.file(DUMP).text()).split("\n");

// term_id → name
const nameById = new Map<number, string>();
for (const seg of tableInserts(lines, "wp_terms")) {
  for (const v of parseTuples(seg)) {
    if (v[0]) nameById.set(Number(v[0]), v[1] ?? "");
  }
}
console.log("terms:", nameById.size);

// taxonomy → [term names]（按 dump 插入顺序）
const byTax = new Map<string, string[]>();
for (const seg of tableInserts(lines, "wp_term_taxonomy")) {
  for (const v of parseTuples(seg)) {
    const taxonomy = v[2] ?? "";
    const termId = Number(v[1]);
    if (!taxonomy.startsWith("pa_")) continue;
    const name = nameById.get(termId);
    if (!name) continue;
    const list = byTax.get(taxonomy) ?? [];
    list.push(name);
    byTax.set(taxonomy, list);
  }
}

let updated = 0;
for (const [taxonomy, names] of byTax) {
  const attrSlug = taxonomy.slice(3);
  for (let i = 0; i < names.length; i++) {
    const res = await db`
      UPDATE product_attribute_values v SET sort = ${i}
      FROM product_attributes a
      WHERE v.attribute_id = a.id AND a.slug = ${attrSlug} AND lower(trim(v.value)) = lower(trim(${names[i]!}))`;
    updated += res.count;
  }
  console.log(taxonomy, "→", names.length, "terms");
}
console.log("updated rows:", updated);
await db.end();