<?php
require __DIR__ . '/../../../../includes/auth.php';
require __DIR__ . '/../../../../includes/db.php'; 
require_login();

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $action = $_POST['action'] ?? '';
    
    // --- ACTION : SAUVEGARDER (AJOUT OU MODIF) ---
    if ($action === 'save') {
        $id = $_POST['id'] ?? '';
        $name = $_POST['name'];
        $category = $_POST['category'];
        $type = $_POST['type'];
        $payment_day = empty($_POST['payment_day']) ? null : (int)$_POST['payment_day'];
        $is_estimate = $_POST['is_estimate'];
        $reg_month = $_POST['reg_month'];
        $keywords = $_POST['mapping_keywords'] ?? ''; 
        $holiday_id = !empty($_POST['holiday_id']) ? (int)$_POST['holiday_id'] : null;

        // ==========================================
        // NOUVELLE NORME COMPTABLE : Dépense = Négatif
        // ==========================================
        // On récupère le montant en valeur absolue (pour éviter les erreurs si l'utilisateur a tapé un '-')
        $amount = abs((float)$_POST['amount']); 
        
        // Si c'est un frais, on l'enregistre en négatif
        if ($category === 'expense') {
            $amount = -$amount;
        }
        // ==========================================

        if ($id) {
            // UPDATE
            $stmt = $pdo->prepare("UPDATE pf_budget_items SET name=?, amount=?, category=?, type=?, payment_day=?, is_estimate=?, reg_month=?, mapping_keywords=?, holiday_id=? WHERE id=?");
            $stmt->execute([$name, $amount, $category, $type, $payment_day, $is_estimate, $reg_month, $keywords, $holiday_id, $id]);
        } else {
            // INSERT
            $stmt = $pdo->prepare("INSERT INTO pf_budget_items (name, amount, category, type, payment_day, is_estimate, reg_month, mapping_keywords, holiday_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->execute([$name, $amount, $category, $type, $payment_day, $is_estimate, $reg_month, $keywords, $holiday_id]);
        }
        
        // Redirection
        header('Location: /budget.php?tab=recap');
        exit;
    }

    // --- ACTION : COCHER/DÉCOCHER RAPIDE (VIA JS FETCH) ---
    if ($action === 'toggle-check') {
        $id     = $_POST['id'];
        $status = $_POST['status']; 
        
        $sql = "UPDATE pf_budget_items SET is_checked = ? WHERE id = ?";
        $stmt = $pdo->prepare($sql);
        $stmt->execute([$status, $id]);
        
        header('Content-Type: application/json');
        echo json_encode(['success' => true]);
        exit;
    }

    // --- ACTION : SUPPRIMER ---
    if ($action === 'delete') {
        $id = $_POST['id'];
        $pdo->prepare("DELETE FROM pf_budget_items WHERE id = ?")->execute([$id]);
        
        if (isset($_POST['ajax'])) {
            header('Content-Type: application/json');
            echo json_encode(['success' => true]);
        } else {
            header('Location: /budget.php?tab=recap');
        }
        exit;
    }

    // --- ACTION : SAUVEGARDER UNE DÉPENSE MANUELLE (FETCH) ---
    if ($action === 'save_expense_manual') {
        header('Content-Type: application/json'); // On force le retour JSON pour notre script JS
        
        try {
            $id = !empty($_POST['expense_id']) ? (int)$_POST['expense_id'] : null;
            $cat = $_POST['category'] ?? ''; 
            $amount = floatval($_POST['amount'] ?? 0); 
            $date = $_POST['date'] ?? date('Y-m-d');
            
            // Format attendu pour gestion_month (qui vient de input type="month") : YYYY-MM. On ajoute le jour.
            $gestionMonth = $_POST['gestion_month'] ?? ''; 
            if (strlen($gestionMonth) === 7) $gestionMonth .= '-01';
            
            $label = trim($_POST['label'] ?? '');
            $budgetItemId = null;
            $holidayId = !empty($_POST['holiday_id']) ? (int)$_POST['holiday_id'] : null;

            if ($cat === 'School' && !empty($_POST['label_select'])) {
                $label = trim($_POST['label_select']);
            } elseif (($cat === 'Frais' || $cat === 'Income') && !empty($_POST['budget_item_id'])) {
                $budgetItemId = (int)$_POST['budget_item_id'];
            }

            // Vérification de sécurité
            if (empty($label) || $amount <= 0) {
                echo json_encode(['success' => false, 'error' => 'Le label et un montant supérieur à 0 sont obligatoires.']);
                exit;
            }

            $is_credit = isset($_POST['is_credit']) ? (int)$_POST['is_credit'] : 0;
            $finalAmount = $is_credit ? abs($amount) : -abs($amount);
            
            if ($id) {
                // UPDATE
                $pdo->prepare("UPDATE pf_expenses SET date_exp=?, gestion_month=?, category=?, label=?, amount=?, budget_item_id=?, holiday_id=? WHERE id=?")
                    ->execute([$date, $gestionMonth, $cat, $label, $finalAmount, $budgetItemId, $holidayId, $id]);
            } else {
                // INSERT
                $uniqueRef = "MANUAL_" . uniqid();
                $pdo->prepare("INSERT INTO pf_expenses (date_exp, gestion_month, category, label, amount, import_ref, budget_item_id, holiday_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?)")
                    ->execute([$date, $gestionMonth, $cat, $label, $finalAmount, $uniqueRef, $budgetItemId, $holidayId]);
            }
            
            echo json_encode(['success' => true]);
            exit;

        } catch (PDOException $e) {
            echo json_encode(['success' => false, 'error' => 'Erreur base de données.']);
            exit;
        }
    }
}