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

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

$response = ['success' => false, 'error' => 'Invalid request'];

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $project_id = $_POST['projectId'] ?? null;
    $month = $_POST['month'] ?? null;

    $metrics = [
        'wip' => $_POST['wip'] ?? null,
        'opening_balance' => $_POST['openingBalance'] ?? null,
        'billings' => $_POST['billings'] ?? null,
        'expenses' => $_POST['expenses'] ?? null,
    ];

    if ($project_id && $month && !in_array(null, $metrics, true)) {
        try {
            $pdo = db();
            $sql = "INSERT INTO projectFinanceMonthly (projectId, month, metricName, value, is_overridden) 
                    VALUES (:pid, :m, :metric, :val, 1)
                    ON DUPLICATE KEY UPDATE value = :val, is_overridden = 1";
            
            $stmt = $pdo->prepare($sql);

            foreach ($metrics as $metricName => $value) {
                $processedValue = ($value === '' || $value === null) ? 0.00 : $value;
                $stmt->execute([
                    ':pid' => $project_id,
                    ':m' => $month,
                    ':metric' => $metricName,
                    ':val' => $processedValue
                ]);
            }

            $response = ['success' => true];

        } catch (PDOException $e) {
            $response['error'] = 'Database error: ' . $e->getMessage();
            error_log($e->getMessage());
        }
    } else {
        $response['error'] = 'Missing required fields.';
    }
}

echo json_encode($response);