get_message

#!/usr/bin/env php
<?php

require_once __DIR__ . '/vendor/autoload.php';

$channel = $argv[1];
$messageNo = (int)$argv[2];

function getChannel(string $name): ?string
{
    $channelDir = __DIR__ . '/channels';
    $dirs = scandir($channelDir);

    foreach ($dirs as $dir) {
        if ($dir === '.' || $dir === '..') {
            continue;
        }

        $channelInfo = json_decode(file_get_contents($channelDir . '/' . $dir . '/channel.json'), true);

        if ($channelInfo['name'] === $name) {
            return $channelInfo['channelId'];
        }
    }

    return null;
}

function getMessage(string $id, int $messageNo): array
{
    $channelDir = __DIR__ . '/channels';
    $messages = json_decode(file_get_contents($channelDir . '/' . $id . '/messages.json'), true);
    $index = $messageNo - 1;

    return $messages[$index] ?? [];
}

$channelId = getChannel($channel);

if (!$channelId) {
    echo 'Channel not found!';
    exit(255);
}

var_dump(getMessage($channelId, $messageNo));

exit(0);