Harden published curriculum and student flows

2026-09-30 08:22:17 +03:00
parent e8163fe265
commit ce7b0fcf14
53 changed files with 4723 additions and 3317 deletions
@@ -0,0 +1,35 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Services;
+
+/** Pure watch-v1 measurement rules. This measures playback evidence, not attention. */
+final class WatchIntervalPolicy
+{
+    public static function evaluate(
+        string $previousType,
+        string $eventType,
+        int $previousPositionMs,
+        int $positionMs,
+        int $serverDeltaSeconds,
+        int $durationMs,
+        string $fundingSource
+    ): array {
+        if ($eventType !== 'heartbeat' || !in_array($previousType, ['start', 'heartbeat', 'resume'], true)) {
+            return ['seconds' => 0, 'status' => 'excluded', 'reason' => 'non_contiguous_event'];
+        }
+        if ($fundingSource === 'none') {
+            return ['seconds' => 0, 'status' => 'excluded', 'reason' => 'unfunded_session'];
+        }
+        if ($durationMs <= 0 || $positionMs > $durationMs) {
+            return ['seconds' => 0, 'status' => 'review', 'reason' => 'position_out_of_bounds'];
+        }
+        $clientDeltaMs = $positionMs - $previousPositionMs;
+        if ($clientDeltaMs < 1000 || $clientDeltaMs > 90000 || $serverDeltaSeconds < 1 || $serverDeltaSeconds > 90) {
+            return ['seconds' => 0, 'status' => 'review', 'reason' => 'implausible_delta'];
+        }
+        $seconds = min((int)floor($clientDeltaMs / 1000), $serverDeltaSeconds, 60);
+        if ($seconds <= 0) return ['seconds' => 0, 'status' => 'excluded', 'reason' => 'zero_interval'];
+        return ['seconds' => $seconds, 'status' => 'measured', 'reason' => 'contiguous_heartbeat'];
+    }
+}