<?php
// DSH PREDICT API - Aggregates opus5-predictive-cache + opus-arch-predictive-heal
// Created 18avr2026 - Opus WIRE - doctrine 59 add-only, zero écrasement
// Fetchable by any dashboard (weval-technology-platform.html, wevia-training.html, etc.)

header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');
header('Cache-Control: no-cache, must-revalidate');

$started = microtime(true);
$out = [
    'ok' => true,
    'module' => 'DSH-PREDICT',
    'version' => '1.0-opus-18avr',
    'ts' => date('c'),
    'sources' => []
];

// Helper: safe internal curl
function _fetch($url, $timeout = 5) {
    $ch = curl_init($url);
    curl_setopt_array($ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => $timeout,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => false,
    ]);
    $r = curl_exec($ch);
    $err = curl_error($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);
    if ($err || $code !== 200) return ['ok' => false, 'error' => $err ?: "http_$code"];
    $j = json_decode($r, true);
    return $j ?: ['ok' => false, 'raw' => substr((string)$r, 0, 300)];
}

// === LOAD prediction (regression) ===
$heal = _fetch('http://127.0.0.1/api/opus-arch-predictive-heal.php', 5);
$out['sources']['heal'] = ['ok' => true];
if (isset($heal['predicted_next_hour'])) {
    $out['load'] = [
        'current_metric' => $heal['metric'] ?? 'load',
        'predicted_next_hour' => $heal['predicted_next_hour'] ?? null,
        'threshold' => $heal['threshold'] ?? 5,
        'alert' => $heal['alert'] ?? false,
        'regression_slope' => $heal['regression']['slope'] ?? null,
        'n_samples' => $heal['n_samples'] ?? null,
        'recommended_actions' => $heal['recommended_actions'] ?? [],
    ];
} else {
    $out['sources']['heal']['ok'] = false;
    $out['sources']['heal']['error'] = $heal['error'] ?? 'no data';
}

// === CACHE predict stats ===
$cache = _fetch('http://127.0.0.1/api/opus5-predictive-cache.php', 5);
$out['sources']['cache'] = ['ok' => true];
if (isset($cache['stats'])) {
    $out['cache'] = [
        'gets' => $cache['stats']['gets'] ?? 0,
        'hits' => $cache['stats']['hits'] ?? 0,
        'misses' => $cache['stats']['misses'] ?? 0,
        'hit_rate_pct' => $cache['stats']['hit_rate_pct'] ?? 0,
        'patterns_count' => $cache['patterns_count'] ?? 0,
        'top_patterns' => array_slice((array)($cache['top_5_patterns'] ?? []), 0, 5, true),
    ];
} else {
    $out['sources']['cache']['ok'] = false;
    $out['sources']['cache']['error'] = $cache['error'] ?? 'no data';
}

// === Summary health badge ===
$load_p = $out['load']['predicted_next_hour'] ?? 0;
$thr = $out['load']['threshold'] ?? 5;
$hit = $out['cache']['hit_rate_pct'] ?? 0;

$out['badge'] = [
    'status' => ($load_p < $thr && !($out['load']['alert'] ?? false)) ? 'GREEN' : 'RED',
    'label' => sprintf('Load %.2f / Cache %d%%', $load_p, $hit),
    'color' => ($load_p < $thr * 0.7) ? '#10b981' : (($load_p < $thr) ? '#f59e0b' : '#ef4444'),
];

$out['elapsed_ms'] = round((microtime(true) - $started) * 1000, 1);
echo json_encode($out, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);