import os
import time
import pandas as pd

predict_data_dir = './data/predict_data'
user_filename = 'user_feature.csv'
video_filename = 'video_feature.csv'


def read_csv_data(filepath):
    if os.path.exists(filepath):
        data = pd.read_csv(filepath, sep=',', engine='python', iterator=True)
        chunk_size = 1000000
        chunks = []
        loop = True
        while loop:
            try:
                chunk_data = data.get_chunk(chunk_size)
                chunks.append(chunk_data)
            except StopIteration:
                loop = False
        df = pd.concat(chunks, ignore_index=True)
        return df
    else:
        print("Don't have this file!")
        return None


if __name__ == '__main__':
    st_time = time.time()
    # 1. 获取用户特征数据
    user_filepath = f"{predict_data_dir}/{user_filename}"
    user_df = read_csv_data(filepath=user_filepath)
    user_df = user_df[user_df['mid'] != '-1']
    print(f"user_df shape: {user_df.shape}")
    # 2. 获取视频特征数据
    video_filepath = f"{predict_data_dir}/{video_filename}"
    video_df = read_csv_data(filepath=video_filepath)
    video_df = video_df[video_df['videoid' != '-1']]
    print(f"video_df shape: {video_df.shape}")
    # 3. 用户特征和视频特征进行拼接
    video_features = [
        'videoid',
        'video_preview_count_uv_30day',
        'video_preview_count_pv_30day',
        'video_view_count_uv_30day',
        'video_view_count_pv_30day',
        'video_play_count_uv_30day',
        'video_play_count_pv_30day',
        'video_share_count_uv_30day',
        'video_share_count_pv_30day',
        'video_return_count_30day',
        'video_ctr_uv_30day',
        'video_ctr_pv_30day',
        'video_share_rate_uv_30day',
        'video_share_rate_pv_30day',
        'video_return_rate_30day',
    ]
    predict_data_dir = './data/predict_data'
    file_list = [f"{predict_data_dir}/predict_data_0.csv", f"{predict_data_dir}/predict_data_1.csv"]
    for file in file_list:
        try:
            os.remove(file)
        except:
            continue
    merge_df_list = []
    for ind, row in video_df.iterrows():
        merge_df_temp = user_df.copy()
        for feature in video_features:
            merge_df_temp[feature] = row[feature]
        merge_df_list.append(merge_df_temp)
        if ind % 100 == 0:
            merge_df = pd.concat(merge_df_list, ignore_index=True)
            print(f"ind: {ind}, merge_df shape: {merge_df.shape}")
            # 4. 拼接广告特征ad_status
            for ad_status in [0, 1]:
                res_df = merge_df.copy()
                res_df['ad_status'] = ad_status
                # 写入csv
                if not os.path.exists(predict_data_dir):
                    os.makedirs(predict_data_dir)
                res_df.to_csv(f"{predict_data_dir}/predict_data_{ad_status}.csv", index=False, mode='a')
            merge_df_list = []

    if len(merge_df_list) > 0:
        merge_df = pd.concat(merge_df_list, ignore_index=True)
        print(f"merge_df shape: {merge_df.shape}")
        # 4. 拼接广告特征ad_status
        for ad_status in [0, 1]:
            res_df = merge_df.copy()
            res_df['ad_status'] = ad_status
            # 写入csv
            if not os.path.exists(predict_data_dir):
                os.makedirs(predict_data_dir)
            res_df.to_csv(f"{predict_data_dir}/predict_data_{ad_status}.csv", index=False, mode='a')

    print(f"{time.time() - st_time}s")