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import numpy as np
import json
import os

valid_track_infos = {'uri', 'name', 'artist_name', 'popularity', 'artist_genres', 'album',
                     'artist_popularity', 'audio_features', 'audio_analysis'}

def get_all_tracks_from_playlist_uri(sp, playlist_uri):
    # get all playlist_tracks
    offset = 0
    tracks = []
    done = False
    while not done:
        new_tracks = sp.playlist_tracks(playlist_uri, offset=offset, limit=100)["items"]
        tracks += new_tracks
        if len(new_tracks) < 100:
            done = True
        else:
            offset += 100
    return tracks

def update_data_with_audio_features(sp, uris, data):
    assert len(uris) <= 100
    tracks_audio_features = sp.audio_features(uris)
    for i in range(len(uris)):
        data[uris[i]]['track']['audio_features'] = tracks_audio_features[i]
    return data, []

def check_all_track_has_audio_features(data):
    for uri in data.keys():
        assert 'audio_features' in data[uri]['track'].keys()

def get_all_tracks_from_playlists(sp, playlist_uris, verbose=False):
    if verbose: print(f'Extracting all tracks from {len(playlist_uris)} playlists.')
    # load data
    cache_path = './cache_track_features_tmp.json'
    if True: #not os.path.exists(cache_path):
        with open(cache_path, 'w') as f:
            json.dump(dict(), f)
    with open(cache_path, 'r') as f:
        data = json.load(f)
    for k in list(data.keys()).copy():
        if k not in playlist_uris:
            data.pop(k)
        else:
            print(k)
    if verbose: print(f'\t{len(data.keys())} tracks loaded from cache')

    # for each playlist, extract all tracks, remove doubles
    if verbose: print(f'\tScanning tracks for each playlist')
    new_additions = 0
    added_uris = []
    for i_playlist, playlist_uri in enumerate(playlist_uris):
        new_tracks = get_all_tracks_from_playlist_uri(sp, playlist_uri)
        # remove doubles
        for new_track in new_tracks:
            uri = new_track['track']['uri'].split(':')[-1]
            if uri not in set(data.keys()):
                genres = sp.artist(new_track['track']['artists'][0]['uri'])['genres']
                new_track['track']['genres'] = genres
                data[uri] = new_track
                added_uris.append(uri)
                new_additions += 1
                # when 100 new added uris, compute their audio features
                if len(added_uris) == 100:
                    data, added_uris = update_data_with_audio_features(sp, added_uris, data)
                if (new_additions + 1) % 1000 == 0:
                    data, added_uris = update_data_with_audio_features(sp, added_uris, data)
                    check_all_track_has_audio_features(data)
                    with open(cache_path, 'w') as f:
                        json.dump(data, f)
        if verbose: print(f"\t\t{i_playlist + 1} playlists scanned ({new_additions} new tracks, total: {len(data.keys())} tracks)")
    if verbose: print('\tDone.')
    data, _ = update_data_with_audio_features(sp, added_uris, data)
    check_all_track_has_audio_features(data)
    with open(cache_path, 'w') as f:
        json.dump(data, f)
    return data


def get_all_tracks_from_user(sp, user_id='bkayf', verbose=False):
    if verbose: print(f'Extracting all tracks from user {user_id}.')
    # load data
    if user_id == 'bkayf':
        cache_path = '../data/bkayf/cache_track_features.json'
        if not os.path.exists(cache_path):
            with open(cache_path, 'w') as f:
                json.dump(dict(), f)
        with open(cache_path, 'r') as f:
            data = json.load(f)
    else:
        data = dict()
    if verbose: print(f'\t{len(data.keys())} tracks loaded from cache')

    # first get all playlists
    offset = 0
    done = False
    playlists = []
    if verbose: print(f'\tScanning playlists.')
    while not done:
        new_playlists = sp.user_playlists(user_id, offset=offset, limit=50)['items']
        playlists += new_playlists
        if len(new_playlists) < 50:
            done = True
            if verbose: print(f'\t\tfrom {offset} to {offset + len(new_playlists)} (complete).')
        else:
            if verbose: print(f'\t\tfrom {offset} to {offset + len(new_playlists)},')
            offset += 50

    # for each playlist, extract all tracks, remove doubles
    if verbose: print(f'\tScanning tracks for each playlist')
    new_additions = 0
    added_uris = []
    for i_playlist, playlist in enumerate(playlists):
        if (i_playlist + 1) % 5 == 0:
            if verbose: print(f"\t\t{i_playlist + 1} playlists scanned ({new_additions} new tracks, total: {len(data.keys())} tracks)")
        playlist_uri = playlist['uri'].split(':')[-1]
        new_tracks = get_all_tracks_from_playlist_uri(sp, playlist_uri)
        # remove doubles
        for new_track in new_tracks:
            uri = new_track['track']['uri'].split(':')[-1]
            if uri not in set(data.keys()):
                data[uri] = new_track
                added_uris.append(uri)
                new_additions += 1
                # when 100 new added uris, compute their audio features
                if len(added_uris) == 100:
                    data, added_uris = update_data_with_audio_features(sp, added_uris, data)
                if (new_additions + 1) % 1000 == 0 and user_id == "bkayf":
                    data, added_uris = update_data_with_audio_features(sp, added_uris, data)
                    check_all_track_has_audio_features(data)
                    with open(cache_path, 'w') as f:
                        json.dump(data, f)
    if verbose: print('\tDone.')
    if user_id == "bkayf":
        data, _ = update_data_with_audio_features(sp, added_uris, data)
        check_all_track_has_audio_features(data)
        with open(cache_path, 'w') as f:
            json.dump(data, f)
    return data


def get_uri_from_link(link):
    return link.split("?")[0].split("/")[-1]




def get_track_info_from_playlist_uri(sp, playlist_uri, which_info=['uri'], verbose=False):
    output = dict()
    assert len(set(which_info) - valid_track_infos) == 0, f"Error which_info. Valid infos are: {valid_track_infos}"

    tracks = get_all_tracks_from_playlist_uri(sp, playlist_uri)
    if verbose: print(f'Playlist with {len(tracks)} tracks.')

    # prepare artist info if needed
    if any([w in which_info for w in ['artist_genres', 'artist_popularity', 'artist_name']]):
        artist_uris = [x["track"]["artists"][0]["uri"] for x in tracks]
        artist_infos = [sp.artist(artist_uri) for artist_uri in artist_uris]

    for info in which_info:
        # print(info)
        if info in ['uri', 'name', 'album', 'popularity']:
            output[info] = []
            for i_t, x in enumerate(tracks):
                print(i_t)
                output[info].append(x["track"][info])
            # output[info] = [x["track"][info] for x in tracks]
        elif info in ['artist_genres', 'artist_popularity', 'artist_name']:
            output[info] = [artist_info[info.split('_')[1]] for artist_info in artist_infos]
        elif info == 'album':
            output[info] = [x["track"][info]["name"] for x in tracks]
        elif info == 'audio_features':
            output[info] = []
            for i_t, x in enumerate(tracks):
                print(i_t)
                output[info].append(sp.audio_features(x["track"]["uri"]))
            # output[info] = [sp.audio_features(x["track"]["uri"]) for x in tracks]
        elif info == 'audio_analysis':
            output[info] = [sp.audio_analysis(x["track"]["uri"]) for x in tracks]
        else:
            raise NotImplementedError

    return output

def compute_progress_and_eta(times, iter, total, n_av=3000):
    av_time = np.mean(times[-n_av:])
    progress = int(((iter + 1) / total) * 100)
    eta_h = int(av_time * (total - iter) // 3600)
    eta_m = int((av_time * (total - iter) - (eta_h * 3600)) // 60)
    eta_s = int((av_time * (total - iter) - (eta_h * 3600) - eta_m * 60))
    eta = f"Progress: {progress}%, ETA: {eta_h}H{eta_m}M{eta_s}S."
    return eta