import { Request, Response } from "express";

import { buildMockUser, buildYearTrend, buildNameList } from "../services/mock.service";

function toInt(value: unknown, fallback: number): number {
  if (typeof value === "number" && Number.isFinite(value)) return Math.floor(value);
  if (typeof value === "string" && value.trim() !== "") {
    const parsed = Number.parseInt(value, 10);
    if (Number.isFinite(parsed)) return parsed;
  }
  return fallback;
}

class MockController {
  getMockUser = (_req: Request, res: Response): void => {
    res.json({
      data: buildMockUser()
    });
  };
  getNames = (req: Request, res: Response): void => {
    const pageSize = Math.max(1, Math.min(200, toInt(req.query.size, 10)));
    const page = Math.max(1, toInt(req.query.page, 1));
    const start = (page - 1) * pageSize;
    const rows = buildNameList(pageSize, start);
    const total = 100000;
    res.json({
      data: {
        total,
        rows
      }
    });
  };
  getTrend = (req: Request, res: Response): void => {
    const rawYear = (req.body as { year?: unknown })?.year;
    const year = typeof rawYear === "string" ? Number.parseInt(rawYear, 10) : typeof rawYear === "number" ? rawYear : NaN;

    if (!Number.isInteger(year) || year < 1970 || year > 9999) {
      res.status(400).json({
        code: "INVALID_YEAR",
        message: "year必须是1970-9999之间的整数"
      });
      return;
    }

    const fullData = buildYearTrend(year);
    const now = new Date();
    const currentYear = now.getUTCFullYear();
    if (year === currentYear) {
      const y = currentYear;
      //const m = String(now.getUTCMonth() + 1).padStart(2, "0");
      const m = '02'
      const d = String(now.getUTCDate()).padStart(2, "0");
      const today = `${y}-${m}-${d}`;
      console.log(today);
      const truncated = fullData.filter((item) => item.label <= today);
      res.json({ data: truncated });
      return;
    }

    res.json({ data: fullData });
  };
}

export default new MockController();