<?php
// Dev-only: merges the Xdebug dumps produced by coverage-prepend.php and
// prints per-file line coverage. Usage (from the repo root):
//
//   SHOW_MISSING=1 php api/coverage-report.php \
//       api/index.php api/router.php api/lib/Auth.php api/lib/ScoreScanner.php

$dir = sys_get_temp_dir() . '/ohmj_cov';
$files = glob($dir . '/cov_*.ser') ?: [];
$merged = [];

foreach ($files as $f) {
    $data = @unserialize(file_get_contents($f));
    if (!is_array($data)) {
        continue;
    }
    foreach ($data as $file => $lines) {
        foreach ($lines as $line => $status) {
            if (!isset($merged[$file][$line]) || $status === 1) {
                $merged[$file][$line] = ($status === 1 || ($merged[$file][$line] ?? -1) === 1) ? 1 : $status;
            }
        }
    }
}

$targets = array_slice($argv, 1);
if (!$targets) {
    $targets = array_keys($merged);
}

$grandTotal = 0;
$grandHit = 0;

foreach ($targets as $target) {
    $target = realpath($target) ?: $target;
    $lines = $merged[$target] ?? [];
    $exec = [];
    $hit = [];
    foreach ($lines as $line => $status) {
        if ($status === -2) {
            continue; // dead code
        }
        $exec[$line] = true;
        if ($status === 1) {
            $hit[$line] = true;
        }
    }
    $total = count($exec);
    $covered = count($hit);
    $grandTotal += $total;
    $grandHit += $covered;
    $pct = $total > 0 ? round($covered * 100 / $total, 1) : 0.0;
    $missing = array_diff(array_keys($exec), array_keys($hit));
    sort($missing);
    printf("%6.1f%%  %3d/%-3d  %s\n", $pct, $covered, $total, str_replace(getcwd() . '/', '', $target));
    if ($missing && getenv('SHOW_MISSING')) {
        echo '        manquantes: ' . implode(', ', $missing) . "\n";
    }
}

if ($grandTotal > 0) {
    printf("\nTOTAL: %d/%d (%.1f%%)\n", $grandHit, $grandTotal, $grandHit * 100 / $grandTotal);
}
echo 'dumps: ' . count($files) . "\n";