import os
import pandas as pd
from pathlib import Path
from time import strptime

code_dir = str(Path(os.getcwd()).parent)
sites_csv_path = os.path.join(code_dir, "coastsnap_sites.csv")
coastsnap_sites_csv = pd.read_csv(sites_csv_path)
images_parent_dir = coastsnap_sites_csv.parent_directory[0] 
images_dir = os.path.join(images_parent_dir, "Images")

stats_csv = pd.DataFrame(columns = ['site','# processed', '# photoshop', '# registered', 'stability', 'most recently deleted'] )

print("Retrieving snapshot for:")
for site in os.listdir(images_dir): # Loop through SITES
    i=0
    print(site)
    to_append = [site, 0, 0, 0, 0, 'None deleted']
    processed = False
    photoshop = False
    registered = False
    latest_deleted_image_found = False
    latest_registered_image_found = False
    site_path = os.path.join(images_dir, site)
    processed_path = os.path.join(site_path,'Processed')
    photoshop_path = os.path.join(site_path,'Photoshop')
    registered_path = os.path.join(site_path, 'Registered')
    try: # Check if site contains 'Processed' directory
        processed_years_list = os.listdir(processed_path)
        processed_years_list = [x for x in processed_years_list if len(x) == 4] # remove files that aren't years
        processed_years_list.reverse()
        processed = True
    except: 
        continue
    
    try: # Check if site contains 'Processed' directory
        photoshop_years_list = os.listdir(photoshop_path)
        photoshop_years_list = [x for x in photoshop_years_list if len(x) == 4] # remove files that aren't years
        photoshop_years_list.reverse()
        photoshop = True
    except: 
        continue

    try: # Check if site contains 'Processed' directory
        registered_years_list = os.listdir(registered_path)
        registered_years_list = [x for x in registered_years_list if len(x) == 4] # remove files that aren't years
        registered_years_list.reverse()
        registered = True
    except: 
        continue

    if processed:
        i=0
        for year in processed_years_list: # Loop through YEARS
            processed_year_path = os.path.join(processed_path, year)
            processed_image_list = os.listdir(processed_year_path)
            processed_image_list.reverse()
            for image_filename in processed_image_list: # Loop through IMAGES
                i += 1
        to_append[1] = i
    
    if photoshop:
        i=0
        for year in photoshop_years_list: # Loop through YEARS
            year_path = os.path.join(photoshop_path, year)
            image_list = os.listdir(year_path)
            image_list.reverse()
            for image_filename in image_list: # Loop through IMAGES
            
                year_path = year_path.replace('Photoshop', 'Registered')
                registered_image_path = year_path + '/' + image_filename[:-4] + '_registered.jpg'
                
                # Finding the Latest Deleted Image Logic:
                # Iterate through 'Images/Processed' 
                if os.path.isfile(registered_image_path):   # Find the latest registered image.
                    latest_registered_image_found = True    # This is so the latest deleted image
                                                            # isn't just the most recent image
                                                          
                if (latest_registered_image_found and       # Check if latest registered image has been found
                    not latest_deleted_image_found and      # Check if latest deleted image has already been found
                    not os.path.isfile(registered_image_path) and # Check if photoshop registered image is also in 'Images/Registered'
                    image_filename.endswith('.jpg')):       # Sanity check: Make sure the file is an image
   
                    latest_deleted_image_found = True
                    filename_list = image_filename.split(".")
                    date = filename_list[3].split("_")
                    image_date = date[0] + '-' + '{:02d}'.format(strptime(filename_list[2],'%b').tm_mon) +'-'+ filename_list[5]
                    to_append[5] = image_date

                i += 1
        to_append[2] = i
    
    if registered:
        i=0
        for year in registered_years_list: # Loop through YEARS
            registered_year_path = os.path.join(registered_path, year)
            registered_image_list = os.listdir(registered_year_path)
            registered_image_list.reverse()
            for image_filename in registered_image_list: # Loop through IMAGES
                i += 1
        to_append[3] = i
    
    stats_csv_length = len(stats_csv)
    stats_csv.loc[stats_csv_length] = to_append
    

# Add site stability data (# registered / # processed)
for i, row in stats_csv.iterrows():    
    stability = "{0:.0%}".format(stats_csv.at[i, '# registered'] / stats_csv.at[i, '# processed'])
    stats_csv.at[i,'stability'] = stability
    
stats_csv.set_index('site', inplace = True)

output_file_path = os.path.join(code_dir, 'statistics.csv')
stats_csv.to_csv(output_file_path)