from __future__ import absolute_import, division, print_function

import re

import numpy as np

import pandas as pd

from sklearn.metrics import (accuracy_score, cohen_kappa_score, f1_score, precision_score, recall_score)

pd.set_option('display.max_rows', 20)

pd.set_option('precision', 4)

np.set_printoptions(precision=4)

class Mura(object):

    """`MURA <https://stanfordmlgroup.github.io/projects/mura/>`_ Dataset :

    Towards Radiologist-Level Abnormality Detection in Musculoskeletal Radiographs.

    """

    url = "https://cs.stanford.edu/group/mlgroup/mura-v1.0.zip"

    filename = "mura-v1.0.zip"

    md5_checksum = '4c36feddb7f5698c8bf291b912c438b1'

    _patient_re = re.compile(r'patient(\d+)')

    _study_re = re.compile(r'study(\d+)')

    _image_re = re.compile(r'image(\d+)')

    _study_type_re = re.compile(r'_(\w+)_patient')

    def __init__(self, image_file_names, y_true, y_pred1=None, y_pred2=None, y_pred3=None, y_pred4=None, y_pred5=None, output_path=None):

        self.imgs = image_file_names

        df_img = pd.Series(np.array(image_file_names), name='img')

        self.y_true = y_true

        df_true = pd.Series(np.array(y_true), name='y_true')

        self.y_pred1 = y_pred1

        self.y_pred2 = y_pred2

        self.y_pred3 = y_pred3

        self.y_pred4 = y_pred4

        self.y_pred5 = y_pred5

        self.output_path = output_path

        # number of unique classes

        self.patient = []

        self.study = []

        self.study_type = []

        self.image_num = []

        self.encounter = []

        self.valid =[]

        for img in image_file_names:

            self.patient.append(self._parse_patient(img))

            self.study.append(self._parse_study(img))

            self.image_num.append(self._parse_image(img))

            self.study_type.append(self._parse_study_type(img))

            self.valid.append(self._parse_valid(img))

            self.encounter.append("MURA-v1.1/{}/XR_{}/patient{}/study{}_{}".format(

                self._parse_valid(img),

                self._parse_study_type(img),

                self._parse_patient(img),

                self._parse_study(img),

                self._parse_normal(img)))

        self.classes = np.unique(self.y_true)

        df_patient = pd.Series(np.array(self.patient), name='patient')

        df_study = pd.Series(np.array(self.study), name='study')

        df_image_num = pd.Series(np.array(self.image_num), name='image_num')

        df_study_type = pd.Series(np.array(self.study_type), name='study_type')

        df_encounter = pd.Series(np.array(self.encounter), name='encounter')

        self.data = pd.concat(

            [

                df_img,

                df_encounter,

                df_true,

                df_patient,

        #        df_patient,

                df_study,

                df_image_num,

                df_study_type,

            ], axis=1)

   #     print(self.data)

        if self.y_pred1 is not None:

            self.y_pred1_probability = self.y_pred1.flatten()

            self.y_pred1 = self.y_pred1_probability.round().astype(int)

            df_y_pred1 = pd.Series(self.y_pred1, name='y_pred1')

            df_y_pred1_probability = pd.Series(self.y_pred1_probability, name='y_pred1_probs')

            self.data = pd.concat((self.data, df_y_pred1, df_y_pred1_probability), axis=1)

        if self.y_pred2 is not None:

            self.y_pred2_probability = self.y_pred2.flatten()

            self.y_pred2 = self.y_pred2_probability.round().astype(int)

            df_y_pred2 = pd.Series(self.y_pred2, name='y_pred2')

            df_y_pred2_probability = pd.Series(self.y_pred2_probability, name='y_pred2_probs')

            self.data = pd.concat((self.data, df_y_pred2, df_y_pred2_probability), axis=1)

        if self.y_pred3 is not None:

            self.y_pred3_probability = self.y_pred3.flatten()

            self.y_pred3 = self.y_pred3_probability.round().astype(int)

            df_y_pred3 = pd.Series(self.y_pred3, name='y_pred3')

            df_y_pred3_probability = pd.Series(self.y_pred3_probability, name='y_pred3_probs')

            self.data = pd.concat((self.data, df_y_pred3, df_y_pred3_probability), axis=1)

        if self.y_pred4 is not None:

            self.y_pred4_probability = self.y_pred4.flatten()

            self.y_pred4 = self.y_pred4_probability.round().astype(int)

            df_y_pred4 = pd.Series(self.y_pred4, name='y_pred4')

            df_y_pred4_probability = pd.Series(self.y_pred4_probability, name='y_pred4_probs')

            self.data = pd.concat((self.data, df_y_pred3, df_y_pred4_probability), axis=1)

        if self.y_pred5 is not None:

            self.y_pred5_probability = self.y_pred5.flatten()

            self.y_pred5 = self.y_pred5_probability.round().astype(int)

            df_y_pred5 = pd.Series(self.y_pred5, name='y_pred5')

            df_y_pred5_probability = pd.Series(self.y_pred5_probability, name='y_pred5_probs')

            self.data = pd.concat((self.data, df_y_pred5, df_y_pred5_probability), axis=1)

    def __len__(self):

        return len(self.imgs)

    def _parse_normal(self, img_filename):

        return "positive" if ("abnormal" in img_filename ) else "negative"

    def _parse_valid(self, img_filename):

        return "valid" if ("valid" in img_filename ) else "test"

    def _parse_patient(self, img_filename):

        return int(self._patient_re.search(img_filename).group(1))

    def _parse_study(self, img_filename):

        return int(self._study_re.search(img_filename).group(1))

    def _parse_image(self, img_filename):

        return int(self._image_re.search(img_filename).group(1))

    def _parse_study_type(self, img_filename):

        return self._study_type_re.search(img_filename).group(1)

    def metrics(self):

        return "per image metrics:\n\taccuracy : {:.3f}\tf1 : {:.3f}\tprecision : {:.3f}\trecall : {:.3f}\tcohen_kappa : {:.3f}".format(

            accuracy_score(self.y_true, self.y_pred2),

            f1_score(self.y_true, self.y_pred2),

            precision_score(self.y_true, self.y_pred2),

            recall_score(self.y_true, self.y_pred2),

            cohen_kappa_score(self.y_true, self.y_pred2), )

    def metrics_by_encounter(self):

        y_pred1 = self.data.groupby(['encounter'])['y_pred1_probs'].mean()

        y_pred2 = self.data.groupby(['encounter'])['y_pred2_probs'].mean()

        y_pred3 = self.data.groupby(['encounter'])['y_pred3_probs'].mean()

        y_pred4 = self.data.groupby(['encounter'])['y_pred4_probs'].mean()

        y_pred5 = self.data.groupby(['encounter'])['y_pred5_probs'].mean()

        week_group  = (list( self.data.groupby(['encounter']).groups.keys()))

        y_pred = ((y_pred1 + y_pred2 + y_pred3 + y_pred4 + y_pred5)/5).round()

        y_pred_ = (y_pred + 1) % 2

        #y_pred = y_pred.round()

        df_pred = pd.Series(np.array(y_pred_, np.int32), index=week_group)

        df_pred.to_csv(self.output_path)

        self.data.to_csv("data.csv", mode="a", header=True)

    #    print(df_pred)

        #df_filename = pd.Series(np.array(week_group))

   #     self.group_data = pd.concat([df_pred])

  #      self.group_data.to_csv(self.output_path)

        y_true = self.data.groupby(['encounter'])['y_true'].mean().round()

        return "per encounter metrics:\n\taccuracy : {:.3f}\tf1 : {:.3f}\tprecision : {:.3f}\trecall : {:.3f}\tcohen_kappa : {:.3f}".format(

            accuracy_score(y_true, y_pred),

            f1_score(y_true, y_pred),

            precision_score(y_true, y_pred),

            recall_score(y_true, y_pred),

            cohen_kappa_score(y_true, y_pred), )

    def metrics_by_study_type(self):

        y_pred1 = self.data.groupby(['patient'])['y_pred1_probs'].mean()

        y_pred2 = self.data.groupby(['patient'])['y_pred2_probs'].mean()

        y_pred3 = self.data.groupby(['patient'])['y_pred3_probs'].mean()

        y_pred4 = self.data.groupby(['patient'])['y_pred4_probs'].mean()

        y_pred5 = self.data.groupby(['patient'])['y_pred5_probs'].mean()

        y_pred = ((y_pred1 + y_pred5 + y_pred3 + y_pred3 + y_pred5)/5).round()

#        y_pred = y_pred1

        y_true = self.data.groupby(['patient'])['y_true'].mean().round()

        self.data.to_csv("data.csv",mode="a",header=True)

        self.group_data =  pd.concat([self.data, y_pred, y_true,], axis=1)

        self.group_data.to_csv("group_data.csv", mode="a", header=True)

        return "per study_type metrics:\n\taccuracy : {:.3f}\tf1 : {:.3f}\tprecision : {:.3f}\trecall : {:.3f}\tcohen_kappa : {:.3f}".format(

            accuracy_score(y_true, y_pred),

            f1_score(y_true, y_pred),

            precision_score(y_true, y_pred),

            recall_score(y_true, y_pred),

            cohen_kappa_score(y_true, y_pred), )