<?php
require_once 'db/config.php';

header('Content-Type: application/json');

$profile_id = $_GET['id'] ?? null;

if (!$profile_id) {
    echo json_encode(['error' => 'Profile ID is missing.']);
    exit;
}

// Basic AI/Rule-based KPI generation
function generate_kpi_data($profile) {
    // In a real scenario, you'd have a more complex logic or an API call to an AI model
    $kpis = [
        ['name' => 'Monthly Recurring Revenue (MRR)', 'current' => '$' . number_format(rand(5000, 15000)), 'target' => '$25,000'],
        ['name' => 'Customer Acquisition Cost (CAC)', 'current' => '$' . number_format(rand(300, 800)), 'target' => '$400'],
        ['name' => 'Net Revenue Retention (NRR)', 'current' => rand(95, 110) . '%', 'target' => '115%']
    ];

    // Generate sample data for the chart
    $labels = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun'];
    $datasets = [
        [
            'label' => 'MRR (Actual)',
            'data' => array_map(fn() => rand(5000, 18000), range(1, 6)),
            'borderColor' => '#0d6efd',
            'tension' => 0.1
        ],
        [
            'label' => 'MRR (Target)',
            'data' => array_map(fn($i) => 15000 + ($i * 1500), range(1, 6)),
            'borderColor' => '#dc3545',
            'borderDash' => [5, 5],
            'tension' => 0.1
        ]
    ];

    return [
        'kpis' => $kpis,
        'chartData' => [
            'labels' => $labels,
            'datasets' => $datasets
        ]
    ];
}

try {
    $pdo = db();
    $stmt = $pdo->prepare("SELECT * FROM gtm_profiles WHERE id = ?");
    $stmt->execute([$profile_id]);
    $profile = $stmt->fetch(PDO::FETCH_ASSOC);

    if (!$profile) {
        echo json_encode(['error' => 'Profile not found.']);
        exit;
    }

    $kpi_data = generate_kpi_data($profile);
    $kpi_data_json = json_encode($kpi_data);

    // Save the generated data to the database
    $update_stmt = $pdo->prepare("UPDATE gtm_profiles SET kpi_data = ? WHERE id = ?");
    $update_stmt->execute([$kpi_data_json, $profile_id]);

    echo json_encode(['success' => true, 'kpi_data' => $kpi_data]);

} catch (PDOException $e) {
    error_log('KPI Generation Error: ' . $e->getMessage());
    echo json_encode(['error' => 'Database error during KPI generation.']);
}