<?php
header('Content-Type: application/json');
require_once __DIR__ . '/../db/config.php';

try {
    $pdo = db();

    // 1. Data for the line chart (applications over time)
    $line_chart_stmt = $pdo->prepare(
        "SELECT DATE(created_at) as date, COUNT(*) as count 
         FROM subscriptions 
         WHERE created_at >= CURDATE() - INTERVAL 30 DAY
         GROUP BY DATE(created_at) 
         ORDER BY date ASC"
    );
    $line_chart_stmt->execute();
    $line_chart_results = $line_chart_stmt->fetchAll(PDO::FETCH_ASSOC);

    $line_chart_labels = [];
    $line_chart_data = [];
    foreach ($line_chart_results as $row) {
        $line_chart_labels[] = $row['date'];
        $line_chart_data[] = (int)$row['count'];
    }

    // 2. Data for status counts (key metrics)
    $status_stmt = $pdo->prepare("SELECT status, COUNT(*) as count FROM subscriptions GROUP BY status");
    $status_stmt->execute();
    $status_results = $status_stmt->fetchAll(PDO::FETCH_KEY_PAIR);

    $total_applications = array_sum($status_results);
    $status_counts = [
        'Total' => $total_applications,
        'Approved' => $status_results['Approved'] ?? 0,
        'Pending' => $status_results['Pending'] ?? 0,
        'Rejected' => $status_results['Rejected'] ?? 0,
    ];

    // 3. Data for insurance type distribution (pie chart)
    $type_stmt = $pdo->prepare("SELECT insuranceType, COUNT(*) as count FROM subscriptions GROUP BY insuranceType");
    $type_stmt->execute();
    $type_results = $type_stmt->fetchAll(PDO::FETCH_KEY_PAIR);

    $pie_chart_labels = array_keys($type_results);
    $pie_chart_data = array_values($type_results);

    // --- Combine all data into a single response ---
    echo json_encode([
        'success' => true,
        'line_chart' => [
            'labels' => $line_chart_labels,
            'data' => $line_chart_data,
        ],
        'key_metrics' => $status_counts,
        'pie_chart' => [
            'labels' => $pie_chart_labels,
            'data' => $pie_chart_data,
        ],
    ]);

} catch (Exception $e) {
    http_response_code(500);
    echo json_encode([
        'success' => false,
        'message' => 'Failed to fetch chart data.',
        'error' => $e->getMessage() // For debugging
    ]);
}