import gradio as gr

import cv2

import torch

import matplotlib.pyplot as plt
from matplotlib import cm
from matplotlib import colors
from mpl_toolkits.axes_grid1 import ImageGrid

from torchvision import transforms

import fire_network

import numpy as np



from PIL import Image

# Possible Scales for multiscale inference
scales = [2.0, 1.414, 1.0, 0.707, 0.5, 0.353, 0.25] 

device = 'cpu'

# Load net
state = torch.load('fire.pth', map_location='cpu')
state['net_params']['pretrained'] = None # no need for imagenet pretrained model
net = fire_network.init_network(**state['net_params']).to(device)
net.load_state_dict(state['state_dict'])

transform = transforms.Compose([
        transforms.Resize(1024),
        transforms.ToTensor(), 
        transforms.Normalize(**dict(zip(["mean", "std"], net.runtime['mean_std'])))
        ])


# sf_idx_ = [55, 14, 5, 4, 52, 57, 40, 9]

col = plt.get_cmap('tab10')

def generate_matching_superfeatures(im1, im2, scale_id=6, threshold=50, sf_ids=''):
    print('im1:', im1.size)
    print('im2:', im2.size)
    # which sf 
    sf_idx_ = [55, 14, 5, 4, 52, 57, 40, 9]
    if sf_ids.lower().startswith('r'):
        n_sf_ids = int(sf_ids[1:])
        sf_idx_ = np.random.randint(256, size=n_sf_ids)
    elif sf_ids != '':
        sf_idx_ = map(int, sf_ids.strip().split(','))
    
    im1_tensor = transform(im1).unsqueeze(0)
    im2_tensor = transform(im2).unsqueeze(0)

    im1_cv = np.array(im1)[:, :, ::-1].copy() 
    im2_cv = np.array(im2)[:, :, ::-1].copy() 

    # extract features
    with torch.no_grad():
        output1 = net.get_superfeatures(im1_tensor.to(device), scales=[scales[scale_id]])
        feats1 = output1[0][0]
        attns1 = output1[1][0]
        strenghts1 = output1[2][0]

        output2 = net.get_superfeatures(im2_tensor.to(device), scales=[scales[scale_id]])
        feats2 = output2[0][0]
        attns2 = output2[1][0]
        strenghts2 = output2[2][0]

    print(feats1.shape, feats2.shape)
    print(attns1.shape, attns2.shape)
    print(strenghts1.shape, strenghts2.shape)
    
    # Store all binary SF att maps to show them all at once in the end
    all_att_bin1 = []
    all_att_bin2 = []
    for n, i in enumerate(sf_idx_):
        # all_atts[n].append(attn[j][scale_id][0,i,:,:].numpy())
        att_heat = np.array(attns1[0,i,:,:].numpy(), dtype=np.float32)
        att_heat = np.uint8(att_heat / np.max(att_heat[:]) * 255.0)
        att_heat_bin  = np.where(att_heat>threshold, 255, 0)
        # print(att_heat_bin)
        all_att_bin1.append(att_heat_bin)

        att_heat = np.array(attns2[0,i,:,:].numpy(), dtype=np.float32)
        att_heat = np.uint8(att_heat / np.max(att_heat[:]) * 255.0)
        att_heat_bin  = np.where(att_heat>threshold, 255, 0)
        all_att_bin2.append(att_heat_bin)

    
    fin_img = []
    img1rsz = np.copy(im1_cv)
    print('im1:', im1.size)
    print('img1rsz:', img1rsz.shape)
    for j, att in enumerate(all_att_bin1):
        att = cv2.resize(att, im1.size, interpolation=cv2.INTER_NEAREST)
        # att = cv2.resize(att, imgz[i].shape[:2][::-1], interpolation=cv2.INTER_CUBIC)
        # att = cv2.resize(att, imgz[i].shape[:2][::-1])
        # att = att.resize(shape)
        # att = resize(att, im1.size)
        mask2d = zip(*np.where(att==255))
        for m,n in mask2d:
            col_ = col.colors[j] if j < 7 else col.colors[j+1]
            if j == 0: col_ = col.colors[9]
            col_ = 255*np.array(colors.to_rgba(col_))[:3]
            img1rsz[m,n, :] = col_[::-1]   
    fin_img.append(img1rsz)
            
    img2rsz = np.copy(im2_cv)
    print('im2:', im2.size)
    print('img2rsz:', img2rsz.shape)
    for j, att in enumerate(all_att_bin2):
        att = cv2.resize(att, im2.size, interpolation=cv2.INTER_NEAREST)
        # att = cv2.resize(att, imgz[i].shape[:2][::-1], interpolation=cv2.INTER_CUBIC)
        # # att = cv2.resize(att, imgz[i].shape[:2][::-1])
        # att = att.resize(im2.shape)
        # print('att:', att.shape)
        mask2d = zip(*np.where(att==255))
        for m,n in mask2d:
            col_ = col.colors[j] if j < 7 else col.colors[j+1]
            if j == 0: col_ = col.colors[9]
            col_ = 255*np.array(colors.to_rgba(col_))[:3]
            img2rsz[m,n, :] = col_[::-1]   
    fin_img.append(img2rsz)

    fig1 = plt.figure(1)
    plt.imshow(cv2.cvtColor(img1rsz, cv2.COLOR_BGR2RGB))
    ax1 = plt.gca()
    # ax1.axis('scaled')
    ax1.axis('off')
    plt.tight_layout()    
    # fig1.canvas.draw()
    
    fig2 = plt.figure(2)
    plt.imshow(cv2.cvtColor(img2rsz, cv2.COLOR_BGR2RGB))
    ax2 = plt.gca()
    # ax2.axis('scaled')
    ax2.axis('off')
    plt.tight_layout()    
    # fig2.canvas.draw()
       
    # fig = plt.figure()
    # grid = ImageGrid(fig, 111, nrows_ncols=(2, 1),  axes_pad=0.1)
    # for ax, img in zip(grid, fin_img):
    #     ax.imshow(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))
    #     ax.axis('scaled')
    #     ax.axis('off')
    # plt.tight_layout()
    # fig.suptitle("Matching SFs", fontsize=16)

    # fig.canvas.draw()
    # # Now we can save it to a numpy array.
    # data = np.frombuffer(fig.canvas.tostring_rgb(), dtype=np.uint8)
    # data = data.reshape(fig.canvas.get_width_height()[::-1] + (3,))
    return fig1, fig2, ','.join(map(str, sf_idx_))


# GRADIO APP
title = "Visualizing Super-features"
description = "This is a visualization demo for the ICLR 2022 paper <b><a href='https://github.com/naver/fire' target='_blank'>Learning Super-Features for Image Retrieval</a></p></b>" 
article = "<p style='text-align: center'><a href='https://github.com/naver/fire' target='_blank'>Original Github Repo</a></p>"


# css = ".output-image, .input-image {height: 40rem !important; width: 100% !important;}"
# css = "@media screen and (max-width: 600px) { .output_image, .input_image {height:20rem !important; width: 100% !important;} }"
# css = ".output_image, .input_image {hieght: 1000px !important}"
css = ".input_image, .input_image {height: 600px !important; width: 600px !important;} "
# css = ".output-image, .input-image {height: 40rem !important; width: 100% !important;}"


iface = gr.Interface(
    fn=generate_matching_superfeatures,
    inputs=[
#        gr.inputs.Image(shape=(1024, 1024), type="pil", label="First Image"),
#        gr.inputs.Image(shape=(1024, 1024), type="pil", label="Second Image"),
        gr.inputs.Image(type="pil", label="First Image"),
        gr.inputs.Image(type="pil", label="Second Image"),
        gr.inputs.Slider(minimum=0, maximum=6, step=1, default=2, label="Scale"),
        gr.inputs.Slider(minimum=1, maximum=255, step=25, default=100, label="Binarization Threshold"),
        gr.inputs.Textbox(lines=1, default="", label="SF IDs to show (comma separated numbers from 0-255; typing 'rX' will return X random SFs", optional=True)],
    outputs=[
        "plot", 
        "plot", 
        gr.outputs.Textbox(label="SFs")],
    # outputs=gr.outputs.Image(shape=(1024,2048), type="plot"),
    title=title,
    theme='peach',
    layout="horizontal",
    description=description,
    article=article,
    css=css,
    examples=[
        ["chateau_1.png", "chateau_2.png", 2, 100, '55,14,5,4,52,57,40,9'],
        ["anafi1.jpeg", "anafi2.jpeg", 4, 50, '99,100,142,213,236']        
    ],
)
iface.launch(enable_queue=True)