<?php

namespace App\Support;

use Carbon\Carbon;

/**
 * 课程/活动进度：1 未开始 / 2 进行中 / 3 已结束
 * 仅按开课/活动起止日期判定；报名窗口不影响进度（报名中由展示层单独处理）
 */
class ScheduleProgressStatus
{
    public static function resolve(
        ?string $periodStart,
        ?string $periodEnd,
        ?string $signupStart = null,
        ?string $signupEnd = null,
    ): int {
        $today = now()->startOfDay();

        if ($periodEnd) {
            $endDate = Carbon::parse($periodEnd)->startOfDay();
            if ($today->gt($endDate)) {
                return 3;
            }
        }

        if ($periodStart) {
            $startDate = Carbon::parse($periodStart)->startOfDay();
            if ($today->lt($startDate)) {
                return 1;
            }
            if (! $periodEnd || $today->lte(Carbon::parse($periodEnd)->startOfDay())) {
                return 2;
            }
        }

        return 1;
    }
}