# main imports
import sys, os, argparse
import subprocess
import time
import numpy as np

# image processing imports
from ipfml.processing import segmentation
from PIL import Image

# models imports
from sklearn.externals import joblib

# modules imports
sys.path.insert(0, '') # trick to enable import of main folder module

import custom_config as cfg
from modules.utils import data as dt


# variables and parameters
scenes_path               = cfg.dataset_path
min_max_filename          = cfg.min_max_filename_extension
threshold_expe_filename   = cfg.seuil_expe_filename

threshold_map_folder      = cfg.threshold_map_folder
threshold_map_file_prefix = cfg.threshold_map_folder + "_"

zones                     = cfg.zones_indices
normalization_choices     = cfg.normalization_choices
features_choices          = cfg.features_choices_labels

simulation_curves_zones   = "simulation_curves_zones_"
tmp_filename              = '/tmp/__model__img_to_predict.png'

current_dirpath = os.getcwd()


def main():

    p_custom = False
        
    parser = argparse.ArgumentParser(description="Script which predicts threshold using specific model")

    parser.add_argument('--solution', type=str, help='Data of solution to specify filters to use')
    parser.add_argument('--model', type=str, help='.joblib or .json file (sklearn or keras model)')
    parser.add_argument('--mode', type=str, help='Kind of normalization level wished', choices=normalization_choices)
    parser.add_argument('--feature', type=str, help='feature data choice', choices=features_choices)
    parser.add_argument('--scene', type=str, help='scene to use for simulation', choices=cfg.scenes_indices)
    #parser.add_argument('--limit_detection', type=int, help='Specify number of same prediction to stop threshold prediction', default=2)
    parser.add_argument('--custom', type=str, help='Name of custom min max file if use of renormalization of data', default=False)
    parser.add_argument('--filter', type=str, help='filter reduction solution used', choices=cfg.filter_reduction_choices)

    args = parser.parse_args()

    # keep p_interval as it is
    p_solution   = args.solution
    p_model_file = args.model
    p_mode       = args.mode
    p_feature    = args.feature
    p_scene      = args.scene
    #p_limit      = args.limit
    p_custom     = args.custom
    p_filter     = args.filter

    # get scene name using index
    
    # list all possibles choices of renderer
    scenes_list = cfg.scenes_names
    scenes_indices = cfg.scenes_indices

    scene_index = scenes_indices.index(p_scene.strip())
    scene_name = scenes_list[scene_index]

    print(scene_name)
    scene_path = os.path.join(scenes_path, scene_name)

    threshold_expes = []
    threshold_expes_found = []
    block_predictions_str = []

    # get all images of folder
    scene_images = sorted([os.path.join(scene_path, img) for img in os.listdir(scene_path) if cfg.scene_image_extension in img])

    start_quality_image = dt.get_scene_image_quality(scene_images[0])
    end_quality_image   = dt.get_scene_image_quality(scene_images[-1])
    # using first two images find the step of quality used
    quality_step_image  = dt.get_scene_image_quality(scene_images[1]) - start_quality_image

    # get zones list info
    for index in zones:
        index_str = str(index)
        if len(index_str) < 2:
            index_str = "0" + index_str
        zone_folder = "zone"+index_str

        threshold_path_file = os.path.join(os.path.join(scene_path, zone_folder), threshold_expe_filename)

        with open(threshold_path_file) as f:
            threshold = int(f.readline())
            threshold_expes.append(threshold)

            # Initialize default data to get detected model threshold found
            threshold_expes_found.append(end_quality_image) # by default use max

        block_predictions_str.append(index_str + ";" + p_model_file + ";" + str(threshold) + ";" + str(start_quality_image) + ";" + str(quality_step_image))


    # for each images
    for img_path in scene_images:

        current_img = Image.open(img_path)
        current_quality_image = dt.get_scene_image_quality(img_path)

        img_blocks = segmentation.divide_in_blocks(current_img, (200, 200))

        for id_block, block in enumerate(img_blocks):

            # check only if necessary for this scene (not already detected)
            #if not threshold_expes_detected[id_block]:

                tmp_file_path = tmp_filename.replace('__model__',  p_model_file.split('/')[-1].replace('.joblib', '_'))
                block.save(tmp_file_path)

                python_cmd_line = "python prediction/predict_noisy_image_svd_" + p_filter + ".py --image {0} --solution '{1}' --model {2} --mode {3} --feature {4}"
                python_cmd = python_cmd_line.format(tmp_file_path, p_solution, p_model_file, p_mode, p_feature) 

                # specify use of custom file for min max normalization
                if p_custom:
                    python_cmd = python_cmd + ' --custom ' + p_custom

                ## call command ##
                p = subprocess.Popen(python_cmd, stdout=subprocess.PIPE, shell=True)

                (output, err) = p.communicate()

                ## Wait for result ##
                p_status = p.wait()

                prediction = int(output)

                # save here in specific file of block all the predictions done
                block_predictions_str[id_block] = block_predictions_str[id_block] + ";" + str(prediction)

                print(str(id_block) + " : " + str(current_quality_image) + "/" + str(threshold_expes[id_block]) + " => " + str(prediction))

        print("------------------------")
        print("Scene " + str(id_scene + 1) + "/" + str(len(scenes)))
        print("------------------------")

    # end of scene => display of results

    # construct path using model name for saving threshold map folder
    model_threshold_path = os.path.join(threshold_map_folder, p_model_file.split('/')[-1].replace('.joblib', ''))

    # create threshold model path if necessary
    if not os.path.exists(model_threshold_path):
        os.makedirs(model_threshold_path)

    map_filename = os.path.join(model_threshold_path, simulation_curves_zones + folder_scene)
    f_map = open(map_filename, 'w')

    for line in block_predictions_str:
        f_map.write(line + '\n')
    f_map.close()

    print("------------------------")

    print("Model predictions are saved into %s" % map_filename)


if __name__== "__main__":
    main()