<?php
header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store');

try {
    $pg = @pg_connect("host=127.0.0.1 dbname=adx_system user=admin password=admin123 connect_timeout=3");
    if (!$pg) throw new Exception("PG connect failed");
    
    // Summary
    $r = pg_query($pg, "SELECT 
        COUNT(*)::int as total_learned,
        SUM(CASE WHEN outcome_success THEN 1 ELSE 0 END)::int as success_total,
        COUNT(DISTINCT (experience->>'chatbot'))::int as bots_count,
        COALESCE(ROUND(AVG((experience->>'total_ms')::int))::int, 0) as avg_ms
      FROM ai_learning_log 
      WHERE learned_at > NOW() - interval '24 hours'");
    $summary = pg_fetch_assoc($r);
    $summary['success_pct'] = $summary['total_learned'] > 0 
        ? round(100.0 * $summary['success_total'] / $summary['total_learned']) 
        : 0;
    
    // Conversations count
    $r = pg_query($pg, "SELECT COUNT(*)::int as total, COUNT(DISTINCT session_id)::int as sessions FROM wevia_conversations");
    $c = pg_fetch_assoc($r);
    $summary['conversations'] = (int)$c['total'];
    $summary['sessions'] = (int)$c['sessions'];
    
    // Per chatbot (24h)
    $r = pg_query($pg, "SELECT 
        experience->>'chatbot' as chatbot,
        COUNT(*)::int as total,
        SUM(CASE WHEN outcome_success THEN 1 ELSE 0 END)::int as success
      FROM ai_learning_log 
      WHERE learned_at > NOW() - interval '24 hours' AND experience->>'chatbot' IS NOT NULL
      GROUP BY experience->>'chatbot'
      ORDER BY total DESC");
    $chatbots = [];
    while ($row = pg_fetch_assoc($r)) {
        $row['total'] = (int)$row['total'];
        $row['success'] = (int)$row['success'];
        $row['success_pct'] = $row['total'] > 0 ? round(100.0 * $row['success'] / $row['total']) : 0;
        $chatbots[] = $row;
    }
    
    // Intents distribution
    $r = pg_query($pg, "SELECT 
        experience->>'intent' as intent,
        COUNT(*)::int as count,
        SUM(CASE WHEN outcome_success THEN 1 ELSE 0 END)::int as success
      FROM ai_learning_log 
      WHERE learned_at > NOW() - interval '24 hours'
      GROUP BY experience->>'intent'
      ORDER BY count DESC");
    $intents = [];
    while ($row = pg_fetch_assoc($r)) {
        $row['count'] = (int)$row['count'];
        $row['success'] = (int)$row['success'];
        $row['rate'] = $row['count'] > 0 ? round(100.0 * $row['success'] / $row['count']) : 0;
        $intents[] = $row;
    }
    
    // Latest 10
    $r = pg_query($pg, "SELECT 
        learned_at,
        experience->>'chatbot' as chatbot,
        experience->>'intent' as intent,
        outcome_success as outcome
      FROM ai_learning_log 
      ORDER BY learned_at DESC LIMIT 10");
    $latest = [];
    while ($row = pg_fetch_assoc($r)) {
        $row['outcome'] = $row['outcome'] === 't';
        $latest[] = $row;
    }
    
    pg_close($pg);
    
    echo json_encode([
        'ts' => date('c'),
        'window' => '24h',
        'summary' => $summary,
        'chatbots' => $chatbots,
        'intents' => $intents,
        'latest' => $latest,
    ], JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
} catch (Throwable $e) {
    http_response_code(500);
    echo json_encode(['error' => $e->getMessage()]);
}