<?php

namespace Tests\Unit;

use App\Services\Chain\TronSigner;
use PHPUnit\Framework\Attributes\DataProvider;
use PHPUnit\Framework\Attributes\Test;
use RuntimeException;
use Tests\TestCase;

class TronSignerTest extends TestCase
{
    private const PRIVATE_KEY = '0000000000000000000000000000000000000000000000000000000000000001';

    #[Test]
    #[DataProvider('validTxIds')]
    public function signs_valid_txid_without_stripping_leading_zeros(string $txId): void
    {
        $sig = TronSigner::signTxId(self::PRIVATE_KEY, $txId);

        $this->assertMatchesRegularExpression('/^[0-9a-f]{130}$/', $sig);
    }

    #[Test]
    public function rejects_0x_prefixed_txid(): void
    {
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/^Invalid txID \(len=/');

        TronSigner::signTxId(self::PRIVATE_KEY, '0x'.str_repeat('ab', 32));
    }

    #[Test]
    public function rejects_truncated_txid_that_old_ltrim_would_produce(): void
    {
        // Old ltrim(..., '0x') would turn "00ab..." into "ab..." (62 chars).
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessageMatches('/^Invalid txID \(len=/');

        TronSigner::signTxId(self::PRIVATE_KEY, str_repeat('ab', 31));
    }

    #[Test]
    public function stress_signs_many_leading_zero_txids(): void
    {
        for ($i = 0; $i < 200; $i++) {
            $prefixZeros = random_int(1, 8);
            $txId = str_repeat('0', $prefixZeros).bin2hex(random_bytes(32));
            $txId = substr($txId, 0, 64);
            $this->assertSame(64, strlen($txId));
            $this->assertSame('0', $txId[0]);

            $sig = TronSigner::signTxId(self::PRIVATE_KEY, $txId);
            $this->assertMatchesRegularExpression('/^[0-9a-f]{130}$/', $sig);
        }
    }

    /**
     * @return array<string, array{0: string}>
     */
    public static function validTxIds(): array
    {
        return [
            'no leading zero' => [str_repeat('ab', 32)],
            'one leading zero' => ['0'.str_repeat('a', 63)],
            'two leading zeros' => ['00'.str_repeat('b', 62)],
            'many leading zeros' => [str_pad('deadbeef', 64, '0', STR_PAD_LEFT)],
            'uppercase accepted after lower' => [strtoupper(str_repeat('cd', 32))],
        ];
    }
}