<?php
require_once __DIR__ . '/../../inc/auth.php';
require_once __DIR__ . '/../../inc/functions.php';
$session = auth_require('owner');

if ($_SERVER['REQUEST_METHOD'] !== 'POST' || !auth_csrf_verify($_POST['csrf_token'] ?? '')) {
    header('Location: ceo.php');
    exit;
}

$pdo = getDB();
$userId = $session['user_id'];

// ---- 1. SLA Stability (с учётом severity нарушений) ----
$stmt = $pdo->query("SELECT COUNT(*) as total, SUM(CASE WHEN sla_compliant=TRUE THEN 1 ELSE 0 END) as compliant FROM tasks WHERE closed_at IS NOT NULL");
$slaData = $stmt->fetch();
$slaCompliance = $slaData['total'] > 0 ? ($slaData['compliant'] / $slaData['total']) * 100 : 100;

// Breach severity from incidents this period
$stmt = $pdo->query("SELECT severity, COUNT(*) as cnt FROM incidents WHERE created_at > NOW() - INTERVAL '30 days' GROUP BY severity");
$breaches = ['P1' => 0, 'P2' => 0, 'P3' => 0];
while ($b = $stmt->fetch()) {
    $breaches[$b['severity']] = (int)$b['cnt'];
}
$breachSeverity = calc_breach_severity($breaches['P1'], $breaches['P2'], $breaches['P3']);
$slaStability = calc_sla_stability_index($slaCompliance, $breachSeverity);

// ---- 2. Revenue Stability (через коэффициент вариации MRR за 6 месяцев) ----
$mrrHistory = [];
$stmt = $pdo->query("SELECT TO_CHAR(created_at, 'YYYY-MM') as ym, SUM(sla_price_monthly) as mrr FROM sla_contracts WHERE status='active' GROUP BY ym ORDER BY ym DESC LIMIT 6");
while ($m = $stmt->fetch()) {
    $mrrHistory[] = (float)$m->mrr;
}
$mrrHistory = array_reverse($mrrHistory);
$currentMrr = !empty($mrrHistory) ? end($mrrHistory) : 0;
$revenueStability = calc_revenue_stability_index($mrrHistory);

// ---- 3. Retention ----
$stmt = $pdo->query("SELECT COUNT(*) FROM sla_contracts WHERE status='active'");
$activeSla = (int)$stmt->fetchColumn();
$stmt = $pdo->query("SELECT COUNT(DISTINCT object_id) FROM sla_contracts WHERE status IN ('active','expired','cancelled')");
$totalEver = (int)$stmt->fetchColumn();
$retention = $totalEver > 0 ? round(($activeSla / $totalEver) * 100, 2) : 100;

// ---- 4. Engineer Performance ----
$stmt = $pdo->query("SELECT AVG(engineer_score) FROM engineer_kpi WHERE period_end > NOW() - INTERVAL '30 days'");
$avgEs = (float)$stmt->fetchColumn();
$engineerPerformance = min(100, $avgEs ?: 70);

// ---- 5. Incident Stability (с весами severity) ----
$stmt = $pdo->query("SELECT severity, COUNT(*) as cnt FROM incidents WHERE created_at > NOW() - INTERVAL '30 days' GROUP BY severity");
$incSev = ['P1' => 0, 'P2' => 0, 'P3' => 0];
while ($i = $stmt->fetch()) {
    $incSev[$i['severity']] = (int)$i['cnt'];
}
$stmt = $pdo->query("SELECT COUNT(*) FROM objects WHERE status='active'");
$objCount = max(1, (int)$stmt->fetchColumn());
$incidentStability = calc_incident_stability_index($incSev['P1'], $incSev['P2'], $incSev['P3'], $objCount);

// ---- 6. Sales Flow (аудиты → SLA конверсия) ----
$stmt = $pdo->query("SELECT COUNT(*) FROM questionnaire_sessions WHERE status='completed' AND created_at > NOW() - INTERVAL '90 days'");
$audits = (int)$stmt->fetchColumn();
$stmt = $pdo->query("SELECT COUNT(*) FROM sla_contracts WHERE created_at > NOW() - INTERVAL '90 days'");
$newSla = (int)$stmt->fetchColumn();
$salesFlow = calc_sales_flow_index($audits, $newSla);

// ---- 7. Operational Efficiency (выручка / (часы × стоимость)) ----
$stmt = $pdo->query("SELECT COUNT(*) FROM tasks WHERE closed_at IS NOT NULL AND closed_at > NOW() - INTERVAL '30 days'");
$closedTasks = (int)$stmt->fetchColumn();
$engineerHours = $closedTasks * 2; // approx 2h per task
$costPerHour = 1500; // руб/час
$operationalEfficiency = calc_operational_efficiency_index($currentMrr, $engineerHours, $costPerHour);

// ---- CEO SHS через calc_ceo_shs() ----
$ceoShsScore = calc_ceo_shs(
    $revenueStability,  /* MRR Growth proxy */
    $slaStability,      /* SLA Compliance */
    $retention,
    $engineerPerformance, /* Productivity */
    $salesFlow,          /* Conversion */
    $incidentStability
);

// ---- SHS (7-факторный) через calc_shs() ----
$shsScore = calc_shs($slaStability, $revenueStability, $retention, $engineerPerformance, $incidentStability, $salesFlow, $operationalEfficiency);
$shsStatus = shs_status($shsScore);

// ---- ΔSHS (дельта от предыдущей записи) ----
$prevRecord = $pdo->query("SELECT shs_score FROM shs_records ORDER BY id DESC LIMIT 1 OFFSET 1")->fetch();
$shsDelta = shs_delta($shsScore, $prevRecord ? (float)$prevRecord['shs_score'] : null);

// ---- Automation Rules ----
$autoAlerts = check_automation_rules($shsScore, $slaStability, $retention);

// ---- Save SHS record ----
$periodStart = date('Y-m-01');
$periodEnd = date('Y-m-t');

$stmt = $pdo->prepare("INSERT INTO shs_records (recorded_by, period_start, period_end, sla_stability, revenue_stability, retention, engineer_performance, incident_stability, sales_flow, operational_efficiency, shs_score, shs_status, components_json) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)");
$stmt->execute([
    $userId, $periodStart, $periodEnd,
    $slaStability, $revenueStability, $retention, $engineerPerformance,
    $incidentStability, $salesFlow, $operationalEfficiency,
    $shsScore, $shsStatus,
    json_encode([
        'sla_compliance_raw' => $slaCompliance,
        'breach_severity'    => $breachSeverity,
        'sla_stability'      => $slaStability,
        'revenue_stability'  => $revenueStability,
        'mrr_history'        => $mrrHistory,
        'current_mrr'        => $currentMrr,
        'retention'          => $retention,
        'active_sla'         => $activeSla,
        'total_ever_sla'     => $totalEver,
        'engineer_perf'      => $engineerPerformance,
        'incident_p1'        => $incSev['P1'],
        'incident_p2'        => $incSev['P2'],
        'incident_p3'        => $incSev['P3'],
        'object_count'       => $objCount,
        'incident_stability' => $incidentStability,
        'audits_90d'         => $audits,
        'new_sla_90d'        => $newSla,
        'sales_flow'         => $salesFlow,
        'closed_tasks_30d'   => $closedTasks,
        'engineer_hours'     => $engineerHours,
        'operational_eff'    => $operationalEfficiency,
        'shs_delta'          => $shsDelta,
        'ceo_shs_score'      => $ceoShsScore,
        'auto_alerts'        => $autoAlerts,
    ])
]);

auth_log($userId, 'shs_calc', "SHS: $shsScore ($shsStatus), CEO SHS: $ceoShsScore, Δ: " . ($shsDelta['delta'] ?? 'N/A'));

header('Location: ceo.php?calc_ok=1');
exit;