<?php

    require 'secrets.php';
    
    const BASE_URL = 'https://api.spotify.com/v1/';
    const AUTH_URL = 'https://accounts.spotify.com/';
    #TODO correctly get tracks only for current month as well as only new tracks
    const MONTHS = [];
    
    $code = $_GET['code'];
    
    if (!$code) {
        exit(1);
    }
    
    #Handle Spotify Token Authorization
    
    $token_data = [
        'grant_type' => 'authorization_code',
        'code' => $code,
        'redirect_uri' => REDIRECT_URI
    ];
    $token_data = http_build_query($token_data);
    
    $token_opts = [
        'http' => [
            'method' => 'POST',
            /*'header' => "Content-type: application/x-www-form-urlencoded\r\n"
                     . "Content-Length: " . strlen($token_data) . "\r\n"
                     . "Authorization: Basic " . base64_encode('868e2cba00de4819900dd8a647a7ba7d:' . CLIENT_SECRET) . "\r\n",*/
            'header' => "Authorization: Basic " . base64_encode('868e2cba00de4819900dd8a647a7ba7d:' . CLIENT_SECRET) . " \r\n",
            'content' => $token_data
        ]
    ];
        
    $token_context = stream_context_create($token_opts);
    
    $spot_req = file_get_contents(AUTH_URL . 'api/token', false, $token_context);
    
    echo $spot_req;
    $spot_json = json_decode($spot_req, true);

    $spot_token = $spot_json['access_token'];
    
    $me_opts = [
        'http' => [
            'method' => 'GET',
            'header' => 'Authorization: Bearer ' . $spot_token . "\r\n"
        ]
    ];
    
    $me_context = stream_context_create($me_opts);
    
    $me_resp = file_get_contents(BASE_URL . 'me', false, $me_context);
    $me_json = json_decode($me_resp, true);
    $me_id = $me_json['id'];
    
    echo '<br />';
    print_r($me_resp);
        
    $html = file_get_contents('https://www.marketplace.org/latest-music');
    $DOM = new DOMDocument;
    $DOM->loadHTML($html);
    $headers = $DOM->getElementsByTagName('h2');
    $divs = $DOM->getElementsByTagName('div');
    
    $date_headers = [];
    $music_group = [];
    
    foreach ($headers as $header) {
        if ($header->hasAttribute('class') && $header->getAttribute('class') === 'river--hed') {
            $date_headers[] = $header->nodeValue;
        }
    }
    foreach ($divs as $div) {
        if ($div->hasAttribute('class') && $div->getAttribute('class') === 'episode-music') {
            $songs = [];
            foreach ($div->childNodes as $row) {
                $children = $row->childNodes[0]->childNodes;
                $songs[] = [
                    'title' => $children[0]->nodeValue,
                    'artist' => $children[1]->nodeValue
                ];
            }
            $music_group[] = $songs;
        }
    }

    echo '<br />';

    print_r($date_headers);
    
    echo '<br />';
    print_r($music_group);
    
    #TODO Check if this month's playlist exists first
    
    $playlist_data = [
        'name' => 'March Marketplace Tracks'
    ];
    
    $playlist_opts = [
        'http' => [
            'method' => 'POST',
            'header' => 'Authorization: Bearer ' . $spot_token . "\r\n"
                     . 'Content-Type application/json \r\n',
            'content' => json_encode($playlist_data)
        ]
    ];
    
    $playlist_context = stream_context_create($playlist_opts);
    
    $playlist_req = file_get_contents(BASE_URL . 'users/' . $me_id . '/playlists', false, $playlist_context);
    
    $playlist_json = json_decode($playlist_req, true);
    
    $playlist_id = $playlist_json['id'];
    
    echo '<br />' . $playlist_id;
    
    $uris = [];
    
    for ($i = count($music_group) - 1; $i >= 0; $i--) {
        
    $track_opts = [
        'http' => [
            'method' => 'GET',
            'header' => 'Authorization: Bearer ' . $spot_token . "\r\n"
        ]
    ];
    
    $track_context = stream_context_create($track_opts);
    
        foreach ($music_group[$i] as $song_info) {
    
            $track_search_url = BASE_URL . 'search?q=track:' . urlencode($song_info['title']) . '+artist:' . urlencode($song_info['artist']) . '&type=track';
             
            echo '<br />' . $track_search_url;
            echo '<br />';
            
            $track_req = file_get_contents($track_search_url, false, $track_context);
            $track_json = json_decode($track_req, true);
            
            print_r($track_json);
            
            $uris[] = $track_json['tracks']['items'][0]['uri'];
            
            #rate limit
            sleep(1);
    
        }
    
    }
    
    $update_data = [
        'uris' => array_values(array_filter($uris, function($uri) {return !is_null($uri);} ))
    ];
    
    echo '<br /> update_data <br />';
    print_r($update_data);
    
    $update_opts = [
        'http' => [
            'method' => 'POST',
            'header' => 'Authorization: Bearer ' . $spot_token . "\r\n"
                     . 'Content-Type application/json \r\n',
            'content' => json_encode($update_data)
        ]
    ];
    
    $update_context = stream_context_create($update_opts);
    $update_url = BASE_URL . 'users/' . $me_id . '/playlists/' . $playlist_id . '/tracks';
    echo '<br />' . $update_url;
    echo '<br />';
    echo '<br />' . count($uris);
    echo '<br />';
    print_r(json_encode($update_data));
    $update_req = file_get_contents(BASE_URL . 'users/' . $me_id . '/playlists/' . $playlist_id . '/tracks', false, $update_context);