<?php


// === Example use ===
#addVideoToFediList('https://www.youtube.com/watch?v=dQw4w9WgXcQ');

require_once('utils.php');

function isYouTubeLink($url) {
    return preg_match('#^(https?://)?(www\.)?(youtube\.com/watch\?v=|youtu\.be/)[a-zA-Z0-9_-]{11}#', $url);
}

function addVideoToFediList($videoUrl) {

    $credentialsDir = __DIR__ . '/_credentials';
    $tokenPath = "$credentialsDir/token.json";
    $playlistId = @file_get_contents("$credentialsDir/fedilist_id.txt");

    if (!$playlistId) {
        echo "‼️ Error: FediList ID not found. Make sure fedilist_id.txt exists.\n";
        return false;
    }

    // === Load client credentials ===
    $secrets = json_decode(file_get_contents("$credentialsDir/client_secret.json"), true);
    $client = $secrets['installed'] ?? $secrets['web'] ?? null;

    if (!$client || !isset($client['client_id'], $client['client_secret'])) {
        die("Error: Invalid client_secret.json format.\n");
    }

    $clientId = $client['client_id'];
    $clientSecret = $client['client_secret'];

    // === Load token ===
    $token = @json_decode(file_get_contents($tokenPath), true);
    if (!$token || !isset($token['access_token'])) {
        echo "‼️ Error: token.json missing or invalid. Authenticate first.\n";
        return false;
    }
    
    //print_r($token);

    // === Refresh token if expired ===

    // Don't let it expire, refresh if we have less than 15 minutes left
    // Google Tokens usually last 60 min, so more ore less around 45min we get a new one
    $refreshSecondMargin = 15*60;

   if (isset($token['expires_at'])) {
    $secondsLeft = $token['expires_at'] - time();
    if ($secondsLeft > $refreshSecondMargin) {
        $minutes = floor($secondsLeft / 60);
        $seconds = $secondsLeft % 60;
        echo "⏳ Token expires in $minutes minutes and $seconds seconds.\n";
    } else {
        echo "🔄 Access token expired or will expire in less than $refreshSecondMargin seconds. (Seconds Left: $secondsLeft).  Refreshing...\n";

        $refreshResponse = curlPost('https://oauth2.googleapis.com/token', [
            'client_id' => $clientId,
            'client_secret' => $clientSecret,
            'refresh_token' => $token['refresh_token'],
            'grant_type' => 'refresh_token'
        ]);

        if (isset($refreshResponse['access_token'])) {
            $token['access_token'] = $refreshResponse['access_token'];
            $token['expires_in'] = $refreshResponse['expires_in'];
            $token['expires_at'] = time() + $refreshResponse['expires_in'];
            file_put_contents($tokenPath, json_encode($token));
            echo "✅ Token refreshed.\n";
        } else {
            echo "‼️ Failed to refresh token: " . ($refreshResponse['error'] ?? 'unknown') . "\n";
            return false;
        }
    }
}


    // === Extract video ID ===
    if (!preg_match('/(?:v=|\/)([a-zA-Z0-9_-]{11})/', $videoUrl, $matches)) {
        echo "⁉️ Invalid YouTube URL: $videoUrl\n";
        return false;
    }	
    $videoId = $matches[1];

    // === Step 1: Check if video is already in playlist ===
    $checkUrl = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId={$playlistId}&maxResults=50";
    $found = false;

    do {
        $ch = curl_init($checkUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'Authorization: Bearer ' . $token['access_token'],
            'User-Agent: curl/7.64.1'
        ]);
        $response = curl_exec($ch);
        curl_close($ch);

        $data = json_decode($response, true);

        foreach ($data['items'] ?? [] as $item) {
            if (($item['snippet']['resourceId']['videoId'] ?? '') === $videoId) {
                echo "ℹ️ Video already in FediList: $videoId\n";
                return false;
            }
        }

        $checkUrl = $data['nextPageToken'] ?? false
            ? $checkUrl . '&pageToken=' . $data['nextPageToken']
            : false;

    } while ($checkUrl);

    // === Step 2: Add the video ===
    $postData = [
        'snippet' => [
            'playlistId' => $playlistId,
            'resourceId' => [
                'kind' => 'youtube#video',
                'videoId' => $videoId
            ]
        ]
    ];

    $ch = curl_init('https://www.googleapis.com/youtube/v3/playlistItems?part=snippet');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Authorization: Bearer ' . $token['access_token'],
        'Content-Type: application/json',
        'User-Agent: curl/7.64.1'
    ]);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($postData));
    $response = curl_exec($ch);
    curl_close($ch);

    $result = json_decode($response, true);

    if (isset($result['id'])) {
        echo "✅ Added video to FediList: $videoId\n";
        return true;
    } else {
        echo "‼️ Failed to add video:\n$response\n";
        return false;
    }
}

?>