from __future__ import print_function

import numpy as np
from PIL import Image
import inspect
import re
import numpy as np
import os
import collections
import matplotlib
matplotlib.use("AGG")
import matplotlib.pyplot as plt
from scipy.ndimage.interpolation import zoom
from skimage.measure import compare_ssim
import torch
# from IPython import embed
import cv2
from datetime import datetime

def datetime_str():
    now = datetime.now()
    return '%04d-%02d-%02d-%02d-%02d-%02d'%(now.year,now.month,now.day,now.hour,now.minute,now.second)

def read_text_file(in_path):
    fid = open(in_path,'r')

    vals = []
    cur_line = fid.readline()
    while(cur_line!=''):
        vals.append(float(cur_line))
        cur_line = fid.readline()

    fid.close()
    return np.array(vals)

def bootstrap(in_vec,num_samples=100,bootfunc=np.mean):
    from astropy import stats
    return stats.bootstrap(np.array(in_vec),bootnum=num_samples,bootfunc=bootfunc)

def rand_flip(input1,input2):
    if(np.random.binomial(1,.5)==1):
        return (input1,input2)
    else:
        return (input2,input1)

def l2(p0, p1, range=255.):
    return .5*np.mean((p0 / range - p1 / range)**2)

def psnr(p0, p1, peak=255.):
    return 10*np.log10(peak**2/np.mean((1.*p0-1.*p1)**2))

def dssim(p0, p1, range=255.):
    # embed()
    return (1 - compare_ssim(p0, p1, data_range=range, multichannel=True)) / 2.

def rgb2lab(in_img,mean_cent=False):
    from skimage import color
    img_lab = color.rgb2lab(in_img)
    if(mean_cent):
        img_lab[:,:,0] = img_lab[:,:,0]-50
    return img_lab

def normalize_blob(in_feat,eps=1e-10):
    norm_factor = np.sqrt(np.sum(in_feat**2,axis=1,keepdims=True))
    return in_feat/(norm_factor+eps)

def cos_sim_blob(in0,in1):
    in0_norm = normalize_blob(in0)
    in1_norm = normalize_blob(in1)
    (N,C,X,Y) = in0_norm.shape

    return np.mean(np.mean(np.sum(in0_norm*in1_norm,axis=1),axis=1),axis=1)

def normalize_tensor(in_feat,eps=1e-10):
    # norm_factor = torch.sqrt(torch.sum(in_feat**2,dim=1)).view(in_feat.size()[0],1,in_feat.size()[2],in_feat.size()[3]).repeat(1,in_feat.size()[1],1,1)
    norm_factor = torch.sqrt(torch.sum(in_feat**2,dim=1)).view(in_feat.size()[0],1,in_feat.size()[2],in_feat.size()[3])
    return in_feat/(norm_factor.expand_as(in_feat)+eps)

def cos_sim(in0,in1):
    in0_norm = normalize_tensor(in0)
    in1_norm = normalize_tensor(in1)
    N = in0.size()[0]
    X = in0.size()[2]
    Y = in0.size()[3]

    return torch.mean(torch.mean(torch.sum(in0_norm*in1_norm,dim=1).view(N,1,X,Y),dim=2).view(N,1,1,Y),dim=3).view(N)

# Converts a Tensor into a Numpy array
# |imtype|: the desired type of the conve

def tensor2np(tensor_obj):
    # change dimension of a tensor object into a numpy array
    return tensor_obj[0].cpu().float().numpy().transpose((1,2,0))

def np2tensor(np_obj):
     # change dimenion of np array into tensor array
    return torch.Tensor(np_obj[:, :, :, np.newaxis].transpose((3, 2, 0, 1)))

def tensor2tensorlab(image_tensor,to_norm=True,mc_only=False):
    # image tensor to lab tensor
    from skimage import color

    img = tensor2im(image_tensor)
    # print('img_rgb',img.flatten())
    img_lab = color.rgb2lab(img)
    # print('img_lab',img_lab.flatten())
    if(mc_only):
        img_lab[:,:,0] = img_lab[:,:,0]-50
    if(to_norm and not mc_only):
        img_lab[:,:,0] = img_lab[:,:,0]-50
        img_lab = img_lab/100.

    return np2tensor(img_lab)

def tensorlab2tensor(lab_tensor,return_inbnd=False):
    from skimage import color
    import warnings
    warnings.filterwarnings("ignore")

    lab = tensor2np(lab_tensor)*100.
    lab[:,:,0] = lab[:,:,0]+50
    # print('lab',lab)

    rgb_back = 255.*np.clip(color.lab2rgb(lab.astype('float')),0,1)
    # print('rgb',rgb_back)
    if(return_inbnd):
        # convert back to lab, see if we match
        lab_back = color.rgb2lab(rgb_back.astype('uint8'))
        # print('lab_back',lab_back)
        # print('lab==lab_back',np.isclose(lab_back,lab,atol=1.))
        # print('lab-lab_back',np.abs(lab-lab_back))
        mask = 1.*np.isclose(lab_back,lab,atol=2.)
        mask = np2tensor(np.prod(mask,axis=2)[:,:,np.newaxis])
        return (im2tensor(rgb_back),mask)
    else:
        return im2tensor(rgb_back)

def tensor2im(image_tensor, imtype=np.uint8, cent=1., factor=255./2.):
# def tensor2im(image_tensor, imtype=np.uint8, cent=1., factor=1.):
    image_numpy = image_tensor[0].cpu().float().numpy()
    image_numpy = (np.transpose(image_numpy, (1, 2, 0)) + cent) * factor
    return image_numpy.astype(imtype)

def im2tensor(image, imtype=np.uint8, cent=1., factor=255./2.):
# def im2tensor(image, imtype=np.uint8, cent=1., factor=1.):
    return torch.Tensor((image / factor - cent)
                        [:, :, :, np.newaxis].transpose((3, 2, 0, 1)))

def tensor2vec(vector_tensor):
    return vector_tensor.data.cpu().numpy()[:, :, 0, 0]

def diagnose_network(net, name='network'):
    mean = 0.0
    count = 0
    for param in net.parameters():
        if param.grad is not None:
            mean += torch.mean(torch.abs(param.grad.data))
            count += 1
    if count > 0:
        mean = mean / count
    print(name)
    print(mean)

def grab_patch(img_in, P, yy, xx):
    return img_in[yy:yy+P,xx:xx+P,:]

def load_image(path):
    if(path[-3:] == 'dng'):
        import rawpy
        with rawpy.imread(path) as raw:
            img = raw.postprocess()
        # img = plt.imread(path)
    elif(path[-3:]=='bmp' or path[-3:]=='jpg' or path[-3:]=='png'):
        import cv2
        return cv2.imread(path)[:,:,::-1]
    else:
        img = (255*plt.imread(path)[:,:,:3]).astype('uint8')

    return img


def resize_image(img, max_size=256):
    [Y, X] = img.shape[:2]

    # resize
    max_dim = max([Y, X])
    zoom_factor = 1. * max_size / max_dim
    img = zoom(img, [zoom_factor, zoom_factor, 1])

    return img

def resize_image_zoom(img, zoom_factor=1., order=3):
    if(zoom_factor==1):
        return img
    else:
        return zoom(img, [zoom_factor, zoom_factor, 1], order=order)

def save_image(image_numpy, image_path, ):
    image_pil = Image.fromarray(image_numpy)
    image_pil.save(image_path)


def prep_display_image(img, dtype='uint8'):
    if(dtype == 'uint8'):
        return np.clip(img, 0, 255).astype('uint8')
    else:
        return np.clip(img, 0, 1.)


def info(object, spacing=10, collapse=1):
    """Print methods and doc strings.
    Takes module, class, list, dictionary, or string."""
    methodList = [
        e for e in dir(object) if isinstance(
            getattr(
                object,
                e),
            collections.Callable)]
    processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s)
    print("\n".join(["%s %s" %
                     (method.ljust(spacing),
                      processFunc(str(getattr(object, method).__doc__)))
                     for method in methodList]))


def varname(p):
    for line in inspect.getframeinfo(inspect.currentframe().f_back)[3]:
        m = re.search(r'\bvarname\s*\(\s*([A-Za-z_][A-Za-z0-9_]*)\s*\)', line)
        if m:
            return m.group(1)


def print_numpy(x, val=True, shp=False):
    x = x.astype(np.float64)
    if shp:
        print('shape,', x.shape)
    if val:
        x = x.flatten()
        print(
            'mean = %3.3f, min = %3.3f, max = %3.3f, median = %3.3f, std=%3.3f' %
            (np.mean(x), np.min(x), np.max(x), np.median(x), np.std(x)))


def mkdirs(paths):
    if isinstance(paths, list) and not isinstance(paths, str):
        for path in paths:
            mkdir(path)
    else:
        mkdir(paths)


def mkdir(path):
    if not os.path.exists(path):
        os.makedirs(path)


def rgb2lab(input):
    from skimage import color
    return color.rgb2lab(input / 255.)


def montage(
    imgs,
    PAD=5,
    RATIO=16 / 9.,
    EXTRA_PAD=(
        False,
        False),
        MM=-1,
        NN=-1,
        primeDir=0,
        verbose=False,
        returnGridPos=False,
        backClr=np.array(
            (0,
             0,
             0))):
    # INPUTS
    #   imgs        YxXxMxN or YxXxN
    #   PAD         scalar              number of pixels in between
    #   RATIO       scalar              target ratio of cols/rows
    #   MM          scalar              # rows, if specified, overrides RATIO
    #   NN          scalar              # columns, if specified, overrides RATIO
    #   primeDir    scalar              0 for top-to-bottom, 1 for left-to-right
    # OUTPUTS
    #   mont_imgs   MM*Y x NN*X x M     big image with everything montaged
    # def montage(imgs, PAD=5, RATIO=16/9., MM=-1, NN=-1, primeDir=0,
    # verbose=False, forceFloat=False):
    if(imgs.ndim == 3):
        toExp = True
        imgs = imgs[:, :, np.newaxis, :]
    else:
        toExp = False

    Y = imgs.shape[0]
    X = imgs.shape[1]
    M = imgs.shape[2]
    N = imgs.shape[3]

    PADS = np.array((PAD))
    if(PADS.flatten().size == 1):
        PADY = PADS
        PADX = PADS
    else:
        PADY = PADS[0]
        PADX = PADS[1]

    if(MM == -1 and NN == -1):
        NN = np.ceil(np.sqrt(1.0 * N * RATIO))
        MM = np.ceil(1.0 * N / NN)
        NN = np.ceil(1.0 * N / MM)
    elif(MM == -1):
        MM = np.ceil(1.0 * N / NN)
    elif(NN == -1):
        NN = np.ceil(1.0 * N / MM)

    if(primeDir == 0):  # write top-to-bottom
        [grid_mm, grid_nn] = np.meshgrid(
            np.arange(MM, dtype='uint'), np.arange(NN, dtype='uint'))
    elif(primeDir == 1):  # write left-to-right
        [grid_nn, grid_mm] = np.meshgrid(
            np.arange(NN, dtype='uint'), np.arange(MM, dtype='uint'))

    grid_mm = np.uint(grid_mm.flatten()[0:N])
    grid_nn = np.uint(grid_nn.flatten()[0:N])

    EXTRA_PADY = EXTRA_PAD[0] * PADY
    EXTRA_PADX = EXTRA_PAD[0] * PADX

    # mont_imgs = np.zeros(((Y+PAD)*MM-PAD, (X+PAD)*NN-PAD, M), dtype=use_dtype)
    mont_imgs = np.zeros(
        (np.uint(
            (Y + PADY) * MM - PADY + EXTRA_PADY),
            np.uint(
            (X + PADX) * NN - PADX + EXTRA_PADX),
            M),
        dtype=imgs.dtype)
    mont_imgs = mont_imgs + \
        backClr.flatten()[np.newaxis, np.newaxis, :].astype(mont_imgs.dtype)

    for ii in np.random.permutation(N):
        # print imgs[:,:,:,ii].shape
        # mont_imgs[grid_mm[ii]*(Y+PAD):(grid_mm[ii]*(Y+PAD)+Y), grid_nn[ii]*(X+PAD):(grid_nn[ii]*(X+PAD)+X),:]
        mont_imgs[np.uint(grid_mm[ii] *
                          (Y +
                           PADY)):np.uint((grid_mm[ii] *
                                           (Y +
                                            PADY) +
                                           Y)), np.uint(grid_nn[ii] *
                                                        (X +
                                                         PADX)):np.uint((grid_nn[ii] *
                                                                         (X +
                                                                          PADX) +
                                                                         X)), :] = imgs[:, :, :, ii]

    if(M == 1):
        imgs = imgs.reshape(imgs.shape[0], imgs.shape[1], imgs.shape[3])

    if(toExp):
        mont_imgs = mont_imgs[:, :, 0]

    if(returnGridPos):
        # return (mont_imgs,np.concatenate((grid_mm[:,:,np.newaxis]*(Y+PAD),
        # grid_nn[:,:,np.newaxis]*(X+PAD)),axis=2))
        return (mont_imgs, np.concatenate(
            (grid_mm[:, np.newaxis] * (Y + PADY), grid_nn[:, np.newaxis] * (X + PADX)), axis=1))
        # return (mont_imgs, (grid_mm,grid_nn))
    else:
        return mont_imgs

class zeroClipper(object):
    def __init__(self, frequency=1):
        self.frequency = frequency

    def __call__(self, module):
        # embed()
        if hasattr(module, 'weight'):
            # module.weight.data = torch.max(module.weight.data, 0)
            module.weight.data = torch.max(module.weight.data, 0) + 100

def flatten_nested_list(nested_list):
    # only works for list of list
    accum = []
    for sublist in nested_list:
        for item in sublist:
            accum.append(item)
    return accum

def read_file(in_path,list_lines=False):
    agg_str = ''
    f = open(in_path,'r')
    cur_line = f.readline()
    while(cur_line!=''):
        agg_str+=cur_line
        cur_line = f.readline()
    f.close()
    if(list_lines==False):
        return agg_str.replace('\n','')
    else:
        line_list = agg_str.split('\n')
        ret_list = []
        for item in line_list:
            if(item!=''):
                ret_list.append(item)
        return ret_list

def read_csv_file_as_text(in_path):
    agg_str = []
    f = open(in_path,'r')
    cur_line = f.readline()
    while(cur_line!=''):
        agg_str.append(cur_line)
        cur_line = f.readline()
    f.close()
    return agg_str

def random_swap(obj0,obj1):
    if(np.random.rand() < .5):
        return (obj0,obj1,0)
    else:
        return (obj1,obj0,1)

def voc_ap(rec, prec, use_07_metric=False):
    """ ap = voc_ap(rec, prec, [use_07_metric])
    Compute VOC AP given precision and recall.
    If use_07_metric is true, uses the
    VOC 07 11 point method (default:False).
    """
    if use_07_metric:
        # 11 point metric
        ap = 0.
        for t in np.arange(0., 1.1, 0.1):
            if np.sum(rec >= t) == 0:
                p = 0
            else:
                p = np.max(prec[rec >= t])
            ap = ap + p / 11.
    else:
        # correct AP calculation
        # first append sentinel values at the end
        mrec = np.concatenate(([0.], rec, [1.]))
        mpre = np.concatenate(([0.], prec, [0.]))

        # compute the precision envelope
        for i in range(mpre.size - 1, 0, -1):
            mpre[i - 1] = np.maximum(mpre[i - 1], mpre[i])

        # to calculate area under PR curve, look for points
        # where X axis (recall) changes value
        i = np.where(mrec[1:] != mrec[:-1])[0]

        # and sum (\Delta recall) * prec
        ap = np.sum((mrec[i + 1] - mrec[i]) * mpre[i + 1])
    return ap
