import { randomUUID } from "node:crypto";

const FIRST_NAMES = ["Alex", "Sam", "Taylor", "Jordan", "Morgan", "Casey", "Riley", "Avery"];
const LAST_NAMES = ["Li", "Wang", "Zhang", "Chen", "Liu", "Yang", "Zhao", "Huang"];
const DISPLAY_NAMES = ["张三", "李四", "王五", "赵六", "孙七", "周八", "吴九", "郑十"];
const ORG_NAMES = [
  "上海浦东支行",
  "北京西城支行",
  "深圳南山支行",
  "杭州西湖支行",
  "广州天河支行",
  "成都高新支行",
  "南京鼓楼支行",
  "武汉光谷支行"
];

export function buildMockUser(): { id: string; name: string; email: string; age: number; createdAt: string } {
  const firstName = pick(FIRST_NAMES);
  const lastName = pick(LAST_NAMES);
  const age = randomInt(18, 60);
  const createdAt = new Date(Date.now() - randomInt(0, 90) * 24 * 60 * 60 * 1000).toISOString();
  const name = `${firstName} ${lastName}`;
  const email = `${firstName.toLowerCase()}.${lastName.toLowerCase()}@example.com`;

  return {
    id: randomUUID(),
    name,
    email,
    age,
    createdAt
  };
}

export function buildNameList(
  count: number,
  offset = 0
): Array<{ userNo: string; displayName: string; orgId: number; orgName: string; days: number; isParty: string; userStatus: number }> {
  const list: Array<{ userNo: string; displayName: string; orgId: number; orgName: string; days: number; isParty: string; userStatus: number }> = [];
  const base = DISPLAY_NAMES;
  const baseLen = base.length || 1;
  const orgBase = ORG_NAMES;
  const orgLen = orgBase.length || 1;
  for (let i = 0; i < count; i += 1) {
    const index = offset + i;
    const dn = base[index % baseLen];
    const userNo = String(index + 1).padStart(6, "0");
    const orgId = 500000 + (index % 100000);
    const orgName = orgBase[index % orgLen];
    list.push({
      userNo,
      displayName: `${dn}${index + 1}`,
      orgId,
      orgName,
      days: 1,
      isParty: String(index % 2),
      userStatus: 1
    });
  }
  return list;
}

export function buildYearTrend(year: number): Array<{ label: string; value: number | string }> {
  const result: Array<{ label: string; value: number | string }> = [];
  let current = new Date(Date.UTC(year, 0, 1));
  while (current.getUTCFullYear() === year) {
    const y = current.getUTCFullYear();
    const m = String(current.getUTCMonth() + 1).padStart(2, "0");
    const d = String(current.getUTCDate()).padStart(2, "0");
    const label = `${y}-${m}-${d}`;
    const value = Math.random() > 0.9 ? "_" : randomInt(0, 100000000000);
    result.push({ label, value });
    current.setUTCDate(current.getUTCDate() + 1);
  }
  return result;
}

function pick<T>(items: T[]): T {
  return items[Math.floor(Math.random() * items.length)];
}

function randomInt(minInclusive: number, maxInclusive: number): number {
  const min = Math.ceil(minInclusive);
  const max = Math.floor(maxInclusive);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}