from IPython.display import HTML

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import pandas as pd

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
from IPython.core.display import HTML
import warnings
warnings.filterwarnings("ignore")

INPUT_DIR = '../data/'
COLS_TO_SHOW = 130


def h(content):
    display(HTML(content))
    
def target_hist(col):
    tr[tr['diagnosis'] == 'normal'][col].plot(style='.', title='Hist ' + col, figsize=(15, 3))
    tr[tr['diagnosis'] == 'post_alzheimer'][col].plot(style='.', title='Hist ' + col, figsize=(15, 3))
    tr[tr['diagnosis'] == 'pre_alzheimer'][col].plot(style='.',figsize=(15, 3),
                                                     title=col + ' (blue=normal, orange=post_alzheimer, green=pre_alzheimer)')
    plt.show()
    
    
def _desc(data, col, label):
    d0 = data.describe().reset_index()
    d0.columns = [col, label]
    return d0.append({col:'unique values', label:data.unique().shape[0]}, ignore_index=True) \
             .append({col:'unique values / count', label:np.round(data.unique().shape[0] / data.shape[0], 4)}, ignore_index=True) \
             .append({col:'NaNs', label:data.isnull().sum()}, ignore_index=True) \
    
def desc1(col):
    d0 = _desc(tr[col], col, 'Train')
    d3 = _desc(te[col], col, 'Validation')
    dd = d0.merge(d3)
    display(dd)
    
    if col not in ['row_id']:
        h('<b>Most popular values (NaN = -999):</b>')
        N = 10
        d0 = tr[['row_id',col]].fillna(-999).groupby(col)['row_id'].count().reset_index()
        d1 = te[['row_id',col]].fillna(-999).groupby(col)['row_id'].count().reset_index()
        dd = d0.merge(d1, how='left', on=col)
        dd['Share in train'] = np.round(dd['row_id_x'] / dd['row_id_x'].sum(), 5)
        dd['Share in validation'] = np.round(dd['row_id_y'] / dd['row_id_y'].sum(), 5)
        dd = dd.sort_values('row_id_x', ascending=False).head(N).fillna(0).reset_index(drop=True)
        dd = dd.rename({'row_id_x':'Count in train (desc)','row_id_y':'Count in validation'}, axis=1)
        display(dd)

def hist1(col):
    plt.figure(figsize=(15, 3))
    plt.subplot(121)
    plt.hist(tr[col], bins=70);
    plt.title('Train histogram: ' + col);
    plt.subplot(122)
    plt.hist(te[col], bins=70);
    plt.title('Validation histogram: ' + col);
    plt.show()

def barh1(col):
    if col not in ['row_id']:
        plt.figure(figsize=(15, 3))
        plt.subplot(121)
        tr[col].value_counts().sort_values().plot(kind = 'barh')
        plt.title('Train value counts: ' + col);
        plt.subplot(122)
        te[col].value_counts().sort_values().plot(kind = 'barh')
        plt.title('Validation value counts: ' + col);
        plt.show()
        
def corr1(col):
    N = None #10000
    num_vars = [f for f in tr.columns if tr[f].dtype != 'object']
    trx = tr.head(N) if N is not None else tr.copy()
    corrs = trx[num_vars].corrwith(trx[col]).reset_index().sort_values(0, ascending=False).reset_index(drop=True).rename({'index':'Column',0:'Correlation with ' + col}, axis=1)
    h('<b>Most correlated values with ' + col + ':</b>')
    trx = pd.concat([corrs.head(6), corrs.dropna().tail(5)])
    def linkx(val):
        return '<a href="#c_{}">{}</a>'.format(val, val) if val in included_cols else val
    trx['Column'] = trx['Column'].apply(linkx)
    h(trx.to_html(escape=False))
    
def numeric(col):
    target_hist(col)
    hist1(col)
    desc1(col)
    corr1(col) 
    
def categorical(col):
    barh1(col)
    desc1(col)

def proc(col):
    h('<h3 id="c_' + col + '">' + col + '</h3>' + '<a style="font-size:11px" href="#home">(Jump to top)</a>')
    categorical(col) if tr[col].dtype == 'object' or tr[col].nunique()<=10 else numeric(col)
        
tr = pd.read_csv(INPUT_DIR + 'train.csv')
te = pd.read_csv(INPUT_DIR + 'validation.csv')

included_cols = list(tr.columns.values[:COLS_TO_SHOW])
split_on = ['row_id','missing_digit_1','1 dist from cen','diagnosis','euc_dist_digit_1','area_digit_1','height_digit_1','width_digit_1','variance_width']
h('<b>Links to column info:</b> ' + ', '.join([('<li>' if col in split_on else '') + '<a href="#c_' + col + '">' + col + '</a>' for col in included_cols]))

h('Train features shape: <b>' + str(tr.shape) + '</b>' + 
  '<br>Validation features shape: <b>' + str(te.shape) + '</b>')
h('Train features preview:')
display(tr.head(10))

for col in included_cols:
    if "diagnosis" not in col:
        proc(col)