from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

from scipy import misc
import sys
import os
import argparse
#import tensorflow as tf
import numpy as np
import mxnet as mx
import random
import cv2
import sklearn
from sklearn.decomposition import PCA
from time import sleep
from easydict import EasyDict as edict
from AgeGenderDist.mtcnn_detector import MtcnnDetector
sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'src', 'common'))
import AgeGenderDist.face_image
import AgeGenderDist.face_preprocess
from pkg_resources import resource_filename


MODEL_STR = resource_filename(__name__, "model/")

def do_flip(data):
  for idx in range(data.shape[0]):
    data[idx,:,:] = np.fliplr(data[idx,:,:])

def get_model(ctx, image_size, model_str, layer):
  epoch = 0
  prefix = MODEL_STR
  print('loading',prefix, epoch)
  sym, arg_params, aux_params = mx.model.load_checkpoint(prefix, epoch)
  all_layers = sym.get_internals()
  sym = all_layers[layer+'_output']
  model = mx.mod.Module(symbol=sym, context=ctx, label_names = None)
  model.bind(data_shapes=[('data', (1, 3, image_size[0], image_size[1]))])
  model.set_params(arg_params, aux_params)
  return model

class FaceModel:
  def __init__(self, args):
    self.args = args
    if args.gpu>=0:
      ctx = mx.gpu(args.gpu)
    else:
      ctx = mx.cpu()
    _vec = args.image_size.split(',')
    assert len(_vec)==2
    image_size = (int(_vec[0]), int(_vec[1]))
    self.model = None
    if len(args.model)>0:
      self.model = get_model(ctx, image_size, args.model, 'fc1')

    self.det_minsize = 50
    self.det_threshold = [0.6,0.7,0.8]
    #self.det_factor = 0.9
    self.image_size = image_size
    mtcnn_path = os.path.join(os.path.dirname(__file__), 'mtcnn-model')
    if args.det==0:
      detector = MtcnnDetector(model_folder=mtcnn_path, ctx=ctx, num_worker=1, accurate_landmark = True, threshold=self.det_threshold)
    else:
      detector = MtcnnDetector(model_folder=mtcnn_path, ctx=ctx, num_worker=1, accurate_landmark = True, threshold=[0.0,0.0,0.2])
    self.detector = detector


  def get_input(self, face_img):
    ret = self.detector.detect_face(face_img, det_type = self.args.det)
    #print('ret',ret)
    if ret is None:
      return None
    bbox, points = ret
    if bbox.shape[0]==0:
      return None
    bbox = bbox[0,0:4]
    points = points[0,:].reshape((2,5)).T
    #print(bbox)
    #print(points)
    nimg = face_preprocess.preprocess(face_img, bbox, points, image_size='112,112')
    nimg = cv2.cvtColor(nimg, cv2.COLOR_BGR2RGB)
    aligned = np.transpose(nimg, (2,0,1))
    input_blob = np.expand_dims(aligned, axis=0)
    data = mx.nd.array(input_blob)
    db = mx.io.DataBatch(data=(data,))
    return db


  def get_ga(self, data):
    self.model.forward(data, is_train=False)
    ret = self.model.get_outputs()[0].asnumpy()
    g = ret[:,0:2].flatten()
    gender = np.argmax(g)
    a = ret[:,2:202].reshape( (100,2) )
    a = np.argmax(a, axis=1)
    age = int(sum(a))

    return gender, age

