<?php

/**
 * Nomi d'acquisto (Mago) delle mescole — tabella mescole_supplier_names.
 *
 * GET  ?action=list&id=ID      nomi della mescola con kg acquistati, prezzo €/kg della mescola
 * GET  ?action=unmatched       descrizioni d'acquisto Mago non abbinate a nessuna mescola
 * GET  ?action=options         mescole e fornitori per le tendine
 * POST action=save             (id) idmescola, idsupplier, name
 * POST action=delete           id
 */
require_once __DIR__ . '/include/headscript.php';
require_once __DIR__ . '/class/MagoClient.php';
require_once __DIR__ . '/class/MagoMixPurchases.php';

header('Content-Type: application/json; charset=utf-8');

function nm_out(array $d)
{
    echo json_encode($d, JSON_UNESCAPED_UNICODE);
    exit;
}

try {
    $pdo = DBHandlerSelect::getInstance()->getConnection();
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $action = $_GET['action'] ?? $_POST['action'] ?? '';

    /* ---------------- elenco nomi di una mescola ---------------- */
    if ($action === 'list') {
        $id = (int)($_GET['id'] ?? 0);
        $st = $pdo->prepare("SELECT sn.id, sn.idsupplier, sn.supplier_mix_name, sn.note, s.supplier_name
                             FROM mescole_supplier_names sn LEFT JOIN suppliers s ON s.idsupplier = sn.idsupplier
                             WHERE sn.idmescola = ? ORDER BY s.supplier_name, sn.supplier_mix_name");
        $st->execute([$id]);
        $rows = $st->fetchAll(PDO::FETCH_ASSOC);
        $lines = MagoMixPurchases::lines($pdo);
        $stats = MagoMixPurchases::nameStats($pdo, $id, $lines);
        foreach ($rows as &$r) {
            $s = $stats[(int)$r['id']] ?? null;
            $r['n'] = $s['n'] ?? 0;
            $r['kg'] = $s ? round($s['kg'], 1) : 0;
            $r['last_price'] = $s && $s['last_price'] !== null ? round($s['last_price'], 4) : null;
            $r['last_date'] = $s['last_date'] ?? null;
            $r['last_desc'] = $s['last_desc'] ?? null;
        }
        unset($r);
        $prices = MagoMixPurchases::prices($pdo, MagoMixPurchases::PRICE_MONTHS, $lines);
        nm_out(['success' => true, 'rows' => $rows, 'price' => $prices[$id] ?? null, 'months' => MagoMixPurchases::PRICE_MONTHS]);
    }

    /* ---------------- descrizioni non abbinate ---------------- */
    if ($action === 'unmatched') {
        $rows = MagoMixPurchases::unmatched($pdo);
        $codes = $pdo->query("SELECT mago_code, idsupplier FROM suppliers WHERE mago_code IS NOT NULL AND mago_code <> ''")->fetchAll(PDO::FETCH_KEY_PAIR);
        foreach ($rows as &$r) $r['idsupplier'] = $codes[$r['supplier_code']] ?? null;
        unset($r);
        $dups = [];
        foreach (MagoMixPurchases::duplicateNames($pdo) as $k => $m) $dups[] = ['name' => $k, 'mescole' => array_values($m)];
        $last = $pdo->query("SELECT MAX(synced_at) FROM mago_mix_purchases")->fetchColumn();
        nm_out(['success' => true, 'rows' => $rows, 'synced_at' => $last, 'duplicates' => $dups]);
    }

    /* ---------------- tendine ---------------- */
    if ($action === 'options') {
        nm_out([
            'success' => true,
            'mescole' => $pdo->query("SELECT id, nome, nomeuscita FROM mescole WHERE is_active = 1 ORDER BY nome")->fetchAll(PDO::FETCH_ASSOC),
            'suppliers' => $pdo->query("SELECT idsupplier, supplier_name, mago_code FROM suppliers ORDER BY supplier_name")->fetchAll(PDO::FETCH_ASSOC),
        ]);
    }

    if ($_SERVER['REQUEST_METHOD'] !== 'POST') nm_out(['success' => false, 'message' => 'Azione non valida']);

    /* ---------------- salva ---------------- */
    if ($action === 'save') {
        $id = (int)($_POST['id'] ?? 0);
        $idm = (int)($_POST['idmescola'] ?? 0);
        $ids = (int)($_POST['idsupplier'] ?? 0);
        $name = trim(preg_replace('/\s+/', ' ', (string)($_POST['name'] ?? '')));
        if (!$idm || !$ids || $name === '') nm_out(['success' => false, 'message' => 'Mescola, fornitore e nome sono obbligatori']);
        $tok = MagoMixPurchases::tokens($name);
        if (!$tok) nm_out(['success' => false, 'message' => 'Il nome non contiene parole utili (es. solo "MESCOLA" o "STRISCIA")']);

        // stesso nome (stesse parole) già su un'altra mescola?
        foreach (MagoMixPurchases::names($pdo) as $n) {
            if ((int)$n['id'] === $id || (int)$n['idmescola'] === $idm) continue;
            if ($n['tokens'] == $tok) {
                nm_out(['success' => false, 'message' => "Questo nome è già usato per la mescola \"{$n['mescola']}\". Toglilo da lì prima, oppure scrivi un nome più preciso."]);
            }
        }
        if ($id) {
            $st = $pdo->prepare("UPDATE mescole_supplier_names SET idsupplier = ?, supplier_mix_name = ? WHERE id = ? AND idmescola = ?");
            $st->execute([$ids, $name, $id, $idm]);
        } else {
            $st = $pdo->prepare("INSERT IGNORE INTO mescole_supplier_names (idmescola, idsupplier, supplier_mix_name, is_preferred) VALUES (?, ?, ?, 0)");
            $st->execute([$idm, $ids, $name]);
            if (!$st->rowCount()) nm_out(['success' => false, 'message' => 'Questo nome c\'è già per la mescola e il fornitore']);
        }
        nm_out(['success' => true]);
    }

    /* ---------------- elimina ---------------- */
    if ($action === 'delete') {
        $st = $pdo->prepare("DELETE FROM mescole_supplier_names WHERE id = ?");
        $st->execute([(int)($_POST['id'] ?? 0)]);
        nm_out(['success' => true]);
    }

    nm_out(['success' => false, 'message' => 'Azione non valida']);
} catch (Throwable $e) {
    nm_out(['success' => false, 'message' => $e->getMessage()]);
}