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<?php
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namespace App\Services;
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use App\Models\Course;
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use App\Models\CourseSign;
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use App\Models\User;
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use Illuminate\Support\Facades\DB;
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class SchoolmateEnrollmentService
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{
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/**
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* 仅选择未删除、尚未成为校友且有有效审核通过报名的学员。
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* 多门课程取最早开课日期；指定课程补齐不受自动入库开关限制。
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*/
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public function pendingUsers($courses)
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{
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return User::query()
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->joinSub($this->eligibleSources($courses), 'schoolmate_sources', function ($join) {
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$join->on('users.id', '=', 'schoolmate_sources.user_id');
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})
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->whereRaw('COALESCE(users.is_schoolmate, 0) != 1')
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->select('users.*', 'schoolmate_sources.source_start_date');
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}
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private function eligibleSources($courses)
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{
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return CourseSign::query()
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->join('courses', 'courses.id', '=', 'course_signs.course_id')
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->whereNull('courses.deleted_at')
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->whereIn('courses.id', (clone $courses)->select('courses.id'))
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->where('course_signs.status', 1)
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->select('course_signs.user_id')
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->selectRaw('MIN(courses.start_date) as source_start_date')
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->groupBy('course_signs.user_id');
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}
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public function ineligibleSchoolmates($courses)
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{
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return User::query()
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->where('users.is_schoolmate', 1)
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->whereNotIn('users.id', $this->eligibleSources($courses)
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->select('course_signs.user_id')->whereNotNull('course_signs.user_id'));
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}
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/**
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* 锁定用户后重新核验，避免按批次查询时取得的旧资格更新用户。
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* 返回 1 表示入库，-1 表示取消，0 表示无需变更。
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*/
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public function reconcile(int $userId, $courses): int
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{
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return DB::transaction(function () use ($userId, $courses) {
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$user = User::whereKey($userId)->lockForUpdate()->first();
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if (!$user) {
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return 0;
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}
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$source = $this->eligibleSources($courses)
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->where('course_signs.user_id', $userId)->first();
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if ($source && $user->is_schoolmate != 1) {
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return User::batchUpdateToSchoolmate([$userId], $source->source_start_date);
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}
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if (!$source && $user->is_schoolmate == 1) {
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$user->is_schoolmate = 0;
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$user->schoolmate_time = null;
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return $user->save() ? -1 : 0;
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}
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return 0;
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});
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}
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public function automaticCourses()
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{
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// 保留开课前一天入库的原行为，同时补查历史及开课后审核通过的学员。
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return Course::where('auto_schoolmate', 1)
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->whereNotNull('start_date')
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->whereDate('start_date', '<=', now()->addDay()->toDateString());
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}
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public function promote(int $userId, string $startDate): int
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{
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return DB::transaction(function () use ($userId, $startDate) {
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// 手工补齐和自动任务同时运行时，不覆盖已有校友的入库时间。
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$user = User::whereKey($userId)->lockForUpdate()->first();
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if (!$user || $user->is_schoolmate == 1) {
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return 0;
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}
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return User::batchUpdateToSchoolmate([$userId], $startDate);
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});
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}
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}
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