<?php

declare(strict_types=1);

namespace Steuerkram\Models;

use Steuerkram\Database;
use Steuerkram\Services\Crypto;

/**
 * Einheitliche Tabelle für alle Bank-Importquellen:
 *   - type='csv'   – CSV-Importformat (Spaltenmapping, Trennzeichen, Templates)
 *   - type='api'   – Direktverbindung über REST/NVP API (PayPal)
 *   - type='fints' – Direktverbindung über FinTS (Comdirect, DKB, …)
 *
 * Beim Lesen werden die verschlüsselten Spalten (client_id_enc, secret_enc, pin_enc)
 * automatisch zu Klartext-Schlüsseln (client_id, secret, pin) entschlüsselt.
 * Außerdem wird "name" als Alias für "bezeichnung" gesetzt, damit der bestehende
 * BankImportParser-Code ($format['name'] etc.) ohne Anpassung funktioniert.
 */
class BankSource
{
    public static function all(?string $type = null): array
    {
        $sql = 'SELECT bs.*, bp.name AS provider_name, bp.verbindungstyp, bp.default_fints_url
                FROM bank_sources bs
                LEFT JOIN bank_providers bp ON bp.id = bs.provider_id';
        $params = [];
        if ($type !== null) {
            $sql .= ' WHERE bs.type = ?';
            $params[] = $type;
        }
        $sql .= ' ORDER BY bs.sort_order, bs.type, bs.bezeichnung';
        $rows = Database::fetchAll($sql, $params);
        return array_map([self::class, 'hydrate'], $rows);
    }

    public static function find(int $id): ?array
    {
        $row = Database::fetchOne(
            'SELECT bs.*, bp.name AS provider_name, bp.verbindungstyp, bp.default_fints_url
             FROM bank_sources bs
             LEFT JOIN bank_providers bp ON bp.id = bs.provider_id
             WHERE bs.id = ?',
            [$id]
        );
        return $row ? self::hydrate($row) : null;
    }

    public static function create(array $data): int
    {
        $type = $data['type'] ?? 'csv';
        $row  = self::dehydrate($data);

        $cols = array_keys($row);
        $sql  = 'INSERT INTO bank_sources (' . implode(',', array_map(fn($c) => "`$c`", $cols)) . ')
                 VALUES (' . implode(',', array_fill(0, count($cols), '?')) . ')';
        Database::execute($sql, array_values($row));
        return (int)Database::lastInsertId();
    }

    public static function update(int $id, array $data): void
    {
        $row = self::dehydrate($data);
        if (empty($row)) {
            return;
        }
        $sets = implode(', ', array_map(fn($c) => "`$c` = ?", array_keys($row)));
        $params = array_values($row);
        $params[] = $id;
        Database::execute("UPDATE bank_sources SET $sets WHERE id = ?", $params);
    }

    public static function updateField(int $id, string $field, mixed $value): void
    {
        if (in_array($field, ['client_id', 'secret', 'pin'], true)) {
            $field = $field . '_enc';
            $value = $value !== null && $value !== '' ? Crypto::encrypt((string)$value) : null;
        }
        Database::execute("UPDATE bank_sources SET `$field` = ? WHERE id = ?", [$value, $id]);
    }

    public static function delete(int $id): void
    {
        Database::execute('DELETE FROM bank_sources WHERE id = ?', [$id]);
    }

    public static function updateLastFetched(int $id): void
    {
        Database::execute('UPDATE bank_sources SET last_fetched_at = NOW() WHERE id = ?', [$id]);
    }

    /** Aktualisiert sort_order anhand der übergebenen ID-Reihenfolge (Position 0..N). */
    public static function updateOrder(array $orderedIds): void
    {
        foreach (array_values($orderedIds) as $pos => $id) {
            $id = (int)$id;
            if ($id <= 0) continue;
            Database::execute(
                'UPDATE bank_sources SET sort_order = ? WHERE id = ?',
                [$pos, $id]
            );
        }
    }

    private static function hydrate(array $row): array
    {
        $row['name']      = $row['bezeichnung'];
        $row['client_id'] = Crypto::decrypt((string)($row['client_id_enc'] ?? ''));
        $row['secret']    = Crypto::decrypt((string)($row['secret_enc']    ?? ''));
        $row['pin']       = Crypto::decrypt((string)($row['pin_enc']       ?? ''));
        return $row;
    }

    /**
     * Überführt ein Eingabe-Array in die DB-Spalten:
     *   - client_id/secret/pin → *_enc (verschlüsselt)
     *   - nur erlaubte Spalten werden zurückgegeben
     */
    private static function dehydrate(array $data): array
    {
        $allowed = [
            'type', 'provider_id', 'bezeichnung', 'kuerzel', 'farbe',
            'skip_rows', 'has_header_row', 'delimiter', 'enclosure',
            'col_buchungstag', 'col_wertstellung', 'col_vorgang', 'col_buchungstext', 'col_wert',
            'col_zahlungspflichtiger', 'col_zahlungsempfaenger', 'col_verwendungszweck',
            'date_format', 'decimal_separator', 'thousands_separator',
            'buchungstext_template_debit', 'buchungstext_template_credit',
            'sandbox', 'last_fetched_at',
            'app_name', 'client_id_enc', 'secret_enc',
            'blz', 'fints_url', 'benutzerkennung', 'pin_enc', 'account_filter',
        ];

        $out = [];
        foreach ($allowed as $col) {
            if (array_key_exists($col, $data)) {
                $out[$col] = $data[$col];
            }
        }

        // Klartext-Felder verschlüsseln
        foreach (['client_id' => 'client_id_enc', 'secret' => 'secret_enc', 'pin' => 'pin_enc'] as $plain => $enc) {
            if (array_key_exists($plain, $data)) {
                $val = $data[$plain];
                $out[$enc] = ($val === null || $val === '') ? null : Crypto::encrypt((string)$val);
            }
        }

        return $out;
    }
}