<?php

namespace App\Services;

use App\Models\Config;
use Illuminate\Validation\ValidationException;

class UsdtRechargeConfigService
{
    /** 能量兑换：多少能量对应多少 TRX，两个值作为一组保存。 */
    private const ENERGY_FIELDS = ['energy_amount' => '能量数量', 'energy_trx' => '能量对应TRX数量'];

    public function get(): array
    {
        $values = Config::whereIn('field', array_merge(['public_chain'], array_keys(self::ENERGY_FIELDS)))->pluck('val', 'field');
        return [
            'public_chain' => (string)($values['public_chain'] ?? ''),
            'energy_amount' => (string)($values['energy_amount'] ?? ''),
            'energy_trx' => (string)($values['energy_trx'] ?? ''),
        ];
    }

    public function save(array $input): array
    {
        foreach (array_merge(['public_chain'], array_keys(self::ENERGY_FIELDS)) as $field) {
            if (isset($input[$field]) && is_string($input[$field])) {
                $input[$field] = trim($input[$field]);
            }
        }
        $data = validator($input, [
            'public_chain' => ['present', 'nullable', 'string', 'max:2048'],
            'energy_amount' => ['nullable', 'integer', 'min:1', 'max:4294967295'],
            'energy_trx' => ['nullable', 'numeric', 'gt:0', 'max:999999999', 'regex:/^\d+(\.\d{1,6})?$/'],
        ], [
            'energy_amount.*' => '能量数量须为正整数',
            'energy_trx.*' => 'TRX数量须大于0，最多6位小数',
        ])->validate();

        // Old pages omit both energy fields and keep the saved pair; a pair is either fully set or fully cleared.
        $energy = array_intersect_key($input, self::ENERGY_FIELDS);
        if ($energy) {
            $filled = array_filter(array_keys(self::ENERGY_FIELDS), fn ($f) => ($data[$f] ?? null) !== null && $data[$f] !== '');
            if (count($filled) === 1) {
                throw ValidationException::withMessages(['energy_amount' => '能量数量与TRX数量需同时填写或同时清空']);
            }
        }

        Config::updateOrCreate(['field' => 'public_chain'], [
            'val' => $data['public_chain'] ?? '',
            'remark' => 'Public Chain 公链地址',
            'group_id' => 1,
        ]);
        if ($energy) {
            foreach (self::ENERGY_FIELDS as $field => $remark) {
                $val = (string)($data[$field] ?? '');
                if ($val !== '') {
                    // Canonical decimal text without float rounding: "003.500" -> "3.5".
                    [$int, $dec] = array_pad(explode('.', $val, 2), 2, '');
                    $val = (ltrim($int, '0') ?: '0') . (rtrim($dec, '0') === '' ? '' : '.' . rtrim($dec, '0'));
                }
                Config::updateOrCreate(['field' => $field], ['val' => $val, 'remark' => $remark, 'group_id' => 1]);
            }
        }

        return $this->get();
    }
}