<?php

namespace ESI_PEPPOL\helpers;

class PEPPOL_Woo_Helper {

    public static function my_get_item_tax_details( \WC_Order_Item $item ): array {
        $taxes = $item->get_taxes(); // ['total' => [rate_id => amount], 'subtotal' => ...]
        $out = [];
    
        if ( ! empty( $taxes['total'] ) ) {
            foreach ( $taxes['total'] as $rate_id => $tax_amount ) {
                $tax_amount = floatval( $tax_amount );
                if ( $tax_amount == 0 ) continue;
    
                $rate = \WC_Tax::_get_tax_rate( $rate_id );
    
                $out[] = [
                    'rate_id' => (int) $rate_id,
                    'percent' => floatval( $rate['tax_rate'] ),
                    'name'    => $rate['tax_rate_name'],
                    'class'   => $rate['tax_rate_class'], // 'standard', 'reduced-rate', etc.
                    'amount'  => $tax_amount,
                    'compound'=> (bool) $rate['tax_rate_compound'],
                ];
            }
        }
    
        return $out;
    }

    public static function esi_get_order_vat_number( $order ) {

        if ( is_numeric( $order ) ) {
            $order = wc_get_order( $order );
        }

        if ( ! $order instanceof \WC_Order ) {
            return '';
        }
    
        // 1) Clés les plus courantes (ajuste/complète si besoin)
        $known_keys = [
            '_billing_vat_number',
            'billing_vat_number',
            '_vat_number',
            'vat_number',
            '_billing_vat',
            'billing_vat',
            '_billing_tva',
            'billing_tva',
            '_tva',
            'tva',
            'eu_vat_number',
            '_eu_vat_number',
            'vat_id',
            '_vat_id',
        ];
    
        foreach ( $known_keys as $key ) {
            $val = $order->get_meta( $key, true );
            if ( ! empty( $val ) ) {
                return is_string($val) ? trim($val) : $val;
            }
        }
    
        // 2) Fallback: scan des meta keys contenant vat/tva
        $vat_candidates = [];
        foreach ( $order->get_meta_data() as $meta ) {
            $k = (string) $meta->key;
            if ( preg_match('/\b(vat|tva)\b/i', $k) || preg_match('/(vat|tva)/i', $k) ) {
                $v = $meta->value;
                if ( is_string($v) ) {
                    $v = trim($v);
                }
                if ( ! empty($v) ) {
                    $vat_candidates[$k] = $v;
                }
            }
        }
    
        // Si plusieurs candidats, tu peux choisir une règle
        // Ici: si un seul => return, sinon priorise ceux qui contiennent "billing"
        if ( count($vat_candidates) === 1 ) {
            return reset($vat_candidates);
        }
        foreach ( $vat_candidates as $k => $v ) {
            if ( stripos($k, 'billing') !== false ) {
                return $v;
            }
        }
    
        // sinon le 1er trouvé
        return ! empty($vat_candidates) ? reset($vat_candidates) : '';
    }

    public static function esi_get_order_vat( $order ) {
        if ( is_numeric($order) ) {
            $order = wc_get_order($order);
        }
        if ( ! $order instanceof WC_Order ) {
            return [
                'found'  => false,
                'key'    => null,
                'value'  => null,
                'source' => null,
            ];
        }
    
        $patterns = [ 'vat','tva','btw','ust','mwst','piva','moms','mva' ];
    
        /* ==================================================
         * 1) CHECKOUT FIELDS (si présents)
         * ================================================== */
        if ( function_exists('WC') && WC()->checkout() ) {
            $fields = WC()->checkout()->get_checkout_fields();
    
            foreach ( $fields as $group_fields ) {
                foreach ( $group_fields as $key => $def ) {
                    $k = strtolower($key);
    
                    foreach ( $patterns as $p ) {
                        if ( strpos($k, $p) !== false ) {
    
                            // tentatives de lecture meta
                            foreach ( [ $key, '_' . $key ] as $meta_key ) {
                                $val = $order->get_meta($meta_key, true);
                                if ( ! empty($val) ) {
                                    return [
                                        'found'  => true,
                                        'key'    => $meta_key,
                                        'value'  => trim((string)$val),
                                        'source' => 'checkout_field',
                                    ];
                                }
                            }
                        }
                    }
    
                    // fallback label
                    $label = strtolower((string)($def['label'] ?? ''));
                    if ( $label && preg_match('/\b(vat|tva|btw|mwst|ust|piva|moms|mva)\b/i', $label) ) {
                        foreach ( [ $key, '_' . $key ] as $meta_key ) {
                            $val = $order->get_meta($meta_key, true);
                            if ( ! empty($val) ) {
                                return [
                                    'found'  => true,
                                    'key'    => $meta_key,
                                    'value'  => trim((string)$val),
                                    'source' => 'checkout_label',
                                ];
                            }
                        }
                    }
                }
            }
        }
    
        /* ==================================================
         * 2) SCAN META (fallback ultime)
         * ================================================== */
        foreach ( $order->get_meta_data() as $meta ) {
            $k = strtolower((string)$meta->key);
    
            foreach ( $patterns as $p ) {
                if ( strpos($k, $p) !== false ) {
                    $v = $meta->value;
                    if ( is_string($v) ) $v = trim($v);
    
                    if ( ! empty($v) ) {
                        return [
                            'found'  => true,
                            'key'    => $meta->key,
                            'value'  => $v,
                            'source' => 'meta_scan',
                        ];
                    }
                }
            }
        }
    
        return [
            'found'  => false,
            'key'    => null,
            'value'  => null,
            'source' => null,
        ];
    }

    /**
     * Détecte tous les champs TVA dans une commande, limités aux groupes billing et shipping.
     * Retourne un tableau de tous les champs trouvés avec leur groupe et leur valeur.
     *
     * @param \WC_Order $order La commande à analyser
     * @return array Tableau de champs TVA trouvés : ['key' => string, 'value' => string, 'group' => 'billing'|'shipping']
     */
    public static function esi_detect_vat_fields_billing_shipping( \WC_Order $order ): array {
        $vat_fields_found = [];
        $patterns = ['vat', 'tva', 'btw', 'ust', 'mwst', 'piva', 'moms', 'mva'];
        
        // Ordre de recherche : billing d'abord, puis shipping
        $search_groups = ['billing', 'shipping'];

        foreach ($search_groups as $group) {
            // Chercher dans les meta keys du groupe (billing ou shipping)
            foreach ($order->get_meta_data() as $meta) {
                $k = (string) $meta->key;
                $k_lower = strtolower($k);
                
                // Vérifier que la clé commence par le groupe recherché (avec ou sans underscore)
                $group_prefix = $group . '_';
                $group_prefix_underscore = '_' . $group . '_';
                if (strpos($k_lower, $group_prefix) !== 0 && strpos($k_lower, $group_prefix_underscore) !== 0) {
                    continue;
                }

                // Vérifier si la clé contient un pattern TVA
                $found = false;
                
                foreach ($patterns as $p) {
                    if (strpos($k_lower, $p) !== false) {
                        $found = true;
                        break;
                    }
                }

                if ($found) {
                    $v = $meta->value;
                    if (is_string($v)) {
                        $v = trim($v);
                    }
                    if (!empty($v)) {
                        if (!isset($vat_fields_found[$k])) {
                            $vat_fields_found[$k] = [
                                'key' => $k,
                                'value' => $v,
                                'group' => $group,
                            ];
                        }
                    }
                }
            }

            // Chercher aussi dans les champs de checkout du groupe
            if (function_exists('WC') && WC()->checkout()) {
                $fields = WC()->checkout()->get_checkout_fields();
                $group_fields = $fields[$group] ?? [];

                foreach ($group_fields as $key => $def) {
                    $k = strtolower($key);
                    $found = false;

                    foreach ($patterns as $p) {
                        if (strpos($k, $p) !== false) {
                            $found = true;
                            break;
                        }
                    }

                    if (!$found) {
                        $label = strtolower((string) ($def['label'] ?? ''));
                        foreach ($patterns as $p) {
                            if (preg_match('/\b' . $p . '\b/i', $label)) {
                                $found = true;
                                break;
                            }
                        }
                    }

                    if ($found) {
                        // Essayer avec et sans préfixe underscore
                        foreach ([$key, '_' . $key] as $meta_key) {
                            $val = $order->get_meta($meta_key, true);
                            if (!empty($val)) {
                                if (!isset($vat_fields_found[$meta_key])) {
                                    $vat_fields_found[$meta_key] = [
                                        'key' => $meta_key,
                                        'value' => is_string($val) ? trim($val) : $val,
                                        'group' => $group,
                                    ];
                                }
                            }
                        }
                    }
                }
            }
        }

        // Si aucun champ n'a été trouvé dans les groupes billing/shipping,
        // chercher dans toutes les meta keys contenant un pattern
        if (empty($vat_fields_found)) {
            foreach ($order->get_meta_data() as $meta) {
                $k = (string) $meta->key;
                $k_lower = strtolower($k);
                
                // Vérifier si la clé contient un pattern TVA
                $found = false;
                foreach ($patterns as $p) {
                    if (strpos($k_lower, $p) !== false) {
                        $found = true;
                        break;
                    }
                }

                if ($found) {
                    $v = $meta->value;
                    if (is_string($v)) {
                        $v = trim($v);
                    }
                    if (!empty($v)) {
                        if (!isset($vat_fields_found[$k])) {
                            $vat_fields_found[$k] = [
                                'key' => $k,
                                'value' => $v,
                                'group' => 'other', // Groupe "other" pour les champs hors billing/shipping
                            ];
                        }
                    }
                }
            }
        }
        

        return array_values($vat_fields_found);
    }
    
}