<?php

namespace NoccyLabs\React\Protocol\Json;

use PHPUnit\Framework\Attributes\CoversClass;
use React\Stream\CompositeStream;
use React\Stream\ThroughStream;

#[CoversClass(JsonProtocol::class)]
class JsonProtocolTest extends \PHPUnit\Framework\TestCase
{

    public function testFrameSeparators()
    {
        $proto = new JsonProtocol("\0");
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("{\"foo\":\"bar\"}\0", $packed);

        $proto = new JsonProtocol("\n");
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("{\"foo\":\"bar\"}\n", $packed);

    }

    public function testFrameSizePrefixes()
    {
        $proto = new JsonProtocol(prependSizeBytes: 1);
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("\x0E{\"foo\":\"bar\"}\0", $packed);

        $proto = new JsonProtocol(prependSizeBytes: 2, prependSizeEndian: 'l');
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("\x0E\x00{\"foo\":\"bar\"}\0", $packed);

        $proto = new JsonProtocol(prependSizeBytes: 2, prependSizeEndian: 'b');
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("\x00\x0E{\"foo\":\"bar\"}\0", $packed);

        $proto = new JsonProtocol(prependSizeBytes: 4, prependSizeEndian: 'l');
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("\x0E\x00\x00\x00{\"foo\":\"bar\"}\0", $packed);

        $proto = new JsonProtocol(prependSizeBytes: 4, prependSizeEndian: 'b');
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("\x00\x00\x00\x0E{\"foo\":\"bar\"}\0", $packed);

    }

    public function testPackingCallbacks()
    {
        $proto = new JsonProtocol(
            prependSizeBytes: 0,
            beforePackCb: function (array $data) {
                $data['a'] = true;
                return $data;
            },
            afterPackCb: function (string $data) {
                return $data."a";
            },
        );
        $packed = $proto->packFrame(['foo' => 'bar']);
        $this->assertEquals("{\"foo\":\"bar\",\"a\":true}\0a", $packed);
    }

    public function testUnpackingCallbacks()
    {
        $proto = new JsonProtocol(
            prependSizeBytes: 0,
            beforeUnpackCb: function (string $data) {
                return strtolower($data);
            },
            afterUnpackCb: function (array $data) {
                unset($data['a']);
                return $data;
            },
        );
        $unpacked = $proto->unpackFrame("{\"FOO\":\"bar\",\"a\":true}\0");
        $expect = ['foo' => 'bar'];
        $this->assertEquals($expect, $unpacked);
    }

    public function testConsumingFrames()
    {
        $proto = new JsonProtocol(
            frameSeparator: "\n"
        );

        $buffer = '{"foo":true}'."\n".'{"bar":false}'."\n";
        $msg1 = $proto->consumeFrame($buffer);
        $msg2 = $proto->consumeFrame($buffer);

        $this->assertEquals(['foo'=>true], $msg1);
        $this->assertEquals(['bar'=>false], $msg2);

        $proto = new JsonProtocol(
            frameSeparator: "\n",
            prependSizeBytes: 4,
            prependSizeEndian: 'l',
        );

        $buffer = "\x0c\x00\x00\x00".'{"foo":true}'."\n"."\x0d\x00\x00\x00".'{"bar":false}'."\n";
        $msg1 = $proto->consumeFrame($buffer);
        $msg2 = $proto->consumeFrame($buffer);

        $this->assertEquals(['foo'=>true], $msg1);
        $this->assertEquals(['bar'=>false], $msg2);

    }
}