from dataclasses import dataclass
from flask import Flask, request, current_app, send_file
# from flask_cors import CORS
import os
import zipfile

import torch
from numpy import save, load
import temp_util.wapp_util as wapp_util
import time

import os
import sys
sys.path.insert(0, os.path.abspath('..'))
torch.manual_seed(0)

print('@@@ import successful')

app = Flask(__name__)


# it is used to collect user input and store them in the app
@app.route('/home', methods=["GET", "POST"])
def get_form_data():
    print('@@@ in Flask Home')
    # form_data = request.get_json() 
    # form_data = request.files['ds_upload'] 
    # print('@@@ form_data', form_data) 
 
    form_data = request.form
    print('@@@ this is form data', form_data)

    # required input
    ds = form_data['select_dataset'] # pick dataset (MNIST, KMNIST, FashionMNIST, CIFAR10, CIFAR100)
    IsLeNet = form_data["select_network"]   # using LeNet or EasyNet or SimpleNet ->> default 
    auto_aug_learner = form_data["select_learner"] # augmentation methods to be excluded

    print('@@@ required user input:', 'ds', ds, 'IsLeNet:', IsLeNet, 'auto_aug_leanrer:',auto_aug_learner)
    # advanced input
    if form_data['batch_size'] != 'undefined': 
        batch_size = form_data['batch_size']       # size of batch the inner NN is trained with
    else: 
        batch_size = 1 # this is for demonstration purposes
    if form_data['learning_rate'] != 'undefined': 
        learning_rate =  form_data['learning_rate']  # fix learning rate
    else: 
        learning_rate = 10-1
    if form_data['toy_size'] != 'undefined': 
        toy_size = form_data['toy_size']      # total propeortion of training and test set we use
    else: 
        toy_size = 1 # this is for demonstration purposes
    if form_data['iterations'] != 'undefined': 
        iterations = form_data['iterations']      # total iterations, should be more than the number of policies
    else: 
        iterations = 10
    exclude_method = form_data['select_action']
    print('@@@ advanced search: batch_size:', batch_size, 'learning_rate:', learning_rate, 'toy_size:', toy_size, 'iterations:', iterations, 'exclude_method', exclude_method)
    

    # default values 
    max_epochs = 10      # max number of epochs that is run if early stopping is not hit
    early_stop_num = 10   # max number of worse validation scores before early stopping is triggered
    num_policies = 5      # fix number of policies
    num_sub_policies = 5  # fix number of sub-policies in a policy
    
    
    # if user upload datasets and networks, save them in the database
    if ds == 'Other':
        ds_folder = request.files['ds_upload'] 
        print('!!!ds_folder', ds_folder)
        ds_name_zip = ds_folder.filename
        ds_name = ds_name_zip.split('.')[0]
        ds_folder.save('./datasets/'+ ds_name_zip)
        with zipfile.ZipFile('./datasets/'+ ds_name_zip, 'r') as zip_ref:
            zip_ref.extractall('./datasets/upload_dataset/')
        if not current_app.debug:
            os.remove(f'./datasets/{ds_name_zip}')
    else: 
        ds_name_zip = None
        ds_name = None

    # test if uploaded dataset meets the criteria 
    for (dirpath, dirnames, filenames) in os.walk(f'./datasets/upload_dataset/{ds_name}/'):
        for dirname in dirnames:
            if dirname[0:6] != 'class_':
                return None # neet to change render to a 'failed dataset webpage'

    # save the user uploaded network
    if IsLeNet == 'Other':
        childnetwork = request.files['network_upload']
        childnetwork.save('./child_networks/'+childnetwork.filename)
        network_name = childnetwork.filename
    else: 
        network_name = None

    
    print("@@@ user input has all stored in the app")

    data = {'ds': ds, 'ds_name': ds_name_zip, 'IsLeNet': IsLeNet, 'network_name': network_name,
            'auto_aug_learner':auto_aug_learner, 'batch_size': batch_size, 'learning_rate': learning_rate, 
            'toy_size':toy_size, 'iterations':iterations, 'exclude_method': exclude_method, }

    current_app.config['data'] = data
    
    print('@@@ all data sent', current_app.config['data'])
    return {'data': 'all stored'}




# ========================================================================
@app.route('/confirm', methods=['POST', 'GET'])
def confirm():
    print('inside confirm page')
    data = current_app.config['data']
    return data




# ========================================================================
@app.route('/training', methods=['POST', 'GET'])
def training():

    # default values 
    max_epochs = 10      # max number of epochs that is run if early stopping is not hit
    early_stop_num = 10   # max number of worse validation scores before early stopping is triggered
    num_policies = 5      # fix number of policies
    num_sub_policies = 5  # fix number of sub-policies in a policy
    data = current_app.config.get('data')

    # fake training
    print('pretend it is training')
    time.sleep(3)
    print('epoch: 1')
    time.sleep(3)
    print('epoch: 2')
    time.sleep(3) 
    print('epoch: 3')
    print('it has finished training')

    return {'status': 'Training is done!'}


# ========================================================================
@app.route('/result')
def show_result():
    file_path = "./policy.txt"
    f = open(file_path, "r")
    return send_file(file_path, as_attachment=True)



@app.route('/api')
def index():
    return {'status': 'api test'}


if __name__ == '__main__':
    app.run(debug=False, use_reloader=False)