import os
import folium
import confuse
import numpy as np
from math import isnan
import geopandas as gpd
from shapely.geometry import Point
from PIL import Image
from tqdm import tqdm
import geopy
from geopy.geocoders import Nominatim
from geopy.exc import GeocoderTimedOut, GeocoderUnavailable

import random
import string
import os
from datetime import datetime, timedelta

TOKEN_FILE = "tokens.txt"
EXPIRED_FILE = "tokens_expired.txt"

def generate_random_unique_tokens(num_tokens=10, token_file=TOKEN_FILE):
    '''Generates a list of random unique tokens and saves them to a file.'''
    if not os.path.exists(token_file):
        with open(token_file, 'w') as f:
            tokens = set()
            while len(tokens) < num_tokens:
                token = ''.join(random.choices(string.ascii_lowercase + string.digits, k=32))
                tokens.add(token)
            for token in tokens:
                f.write(token + '\n')
    else:
        with open(token_file, 'r') as f:
            tokens = set(f.read().splitlines())
        with open(token_file, 'a') as f:
            while len(tokens) < num_tokens:
                token = ''.join(random.choices(string.ascii_lowercase + string.digits, k=32))
                if token not in tokens:
                    tokens.add(token)
                    f.write(token + '\n')
    return tokens

def confirm_api_token(token, token_file=TOKEN_FILE, expired_file=EXPIRED_FILE):
    '''Checks if the given token is valid and not expired.'''
    with open(token_file, 'r') as f:
        tokens = set(f.read().splitlines())
    if token in tokens:
        now = datetime.now()
        if token in load_expired_tokens(expired_file):
            if now < load_token_expiration(token, expired_file):
                return True
        else:
            expiry_date = now + timedelta(hours=1)
            save_expired_token(token, expiry_date, expired_file)
            return True
    return False

def load_expired_tokens(expired_file=EXPIRED_FILE):
    '''Loads expired tokens from the file.'''
    expired_tokens = {}
    if os.path.exists(expired_file):
        with open(expired_file, 'r') as f:
            for line in f:
                token, expiry_date = line.strip().split(',')
                expired_tokens[token] = datetime.fromisoformat(expiry_date)
    return expired_tokens

def load_token_expiration(token, expired_file=EXPIRED_FILE):
    '''Loads the expiration date for a given token.'''
    expired_tokens = load_expired_tokens(expired_file)
    return expired_tokens.get(token)

def save_expired_token(token, expiry_date, expired_file=EXPIRED_FILE):
    '''Saves expired tokens to the file.'''
    if not os.path.exists(expired_file):
        with open(expired_file, 'w') as f:
            f.write(f"{token},{expiry_date.isoformat()}\n")
    else:
        with open(expired_file, 'a') as f:
            f.write(f"{token},{expiry_date.isoformat()}\n")


def get_region_from_coordinates(latitude, longitude, max_retries=3):
    geolocator = Nominatim(user_agent="my_agent")
    
    for attempt in range(max_retries):
        try:
            location = geolocator.reverse(f"{latitude}, {longitude}")
            if location and location.raw.get('address'):
                address = location.raw['address']
                # Try to get the most relevant administrative level
                for level in ['state', 'county', 'region', 'province', 'district']:
                    if level in address:
                        return address[level]
                # If no specific region is found, return the country
                if 'country' in address:
                    return address['country']
            return "Region not found"
        except (GeocoderTimedOut, GeocoderUnavailable):
            if attempt == max_retries - 1:
                return "Geocoding service unavailable"
    
    return "Failed to retrieve region information"


# Initialzie custom basemaps for folium
basemaps = {
    'Google Maps': folium.TileLayer(
        tiles = 'https://mt1.google.com/vt/lyrs=m&x={x}&y={y}&z={z}',
        attr = 'Google',
        name = 'Google Maps',
        overlay = True,
        control = True
    ),
    'Google Satellite': folium.TileLayer(
        tiles = 'https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}',
        attr = 'Google',
        name = 'Google Satellite',
        overlay = True,
        control = True
    ),
    'Google Terrain': folium.TileLayer(
        tiles = 'https://mt1.google.com/vt/lyrs=p&x={x}&y={y}&z={z}',
        attr = 'Google',
        name = 'Google Terrain',
        overlay = True,
        control = True
    ),
    'Google Satellite Hybrid': folium.TileLayer(
        tiles = 'https://mt1.google.com/vt/lyrs=y&x={x}&y={y}&z={z}',
        attr = 'Google',
        name = 'Google Satellite',
        overlay = True,
        control = True
    ),
    'Esri Satellite': folium.TileLayer(
        tiles = 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}',
        attr = 'Esri',
        name = 'Esri Satellite',
        overlay = True,
        control = True
    ),
    'openstreetmap': folium.TileLayer('openstreetmap'),
    'cartodbdark_matter': folium.TileLayer('cartodbdark_matter')
}


# Dictionary of JavaScript files (More Readable)
scripts_dir = './scripts/'
scripts_files = [f for f in os.listdir(scripts_dir) if f.endswith('.js')]
Scripts = {}
for f in scripts_files:
    key = f.split('.')[0].upper()
    with open(scripts_dir + f) as f:
        Scripts[key] = f.read()

def calculate_bbox(df, field):
    '''
    Calculate the bounding box of a specfic field  ID in a  given data frame
    '''
    bbox = df.loc[df['name'] == field].bounds
    r = bbox.iloc[0]
    return [r.minx, r.miny, r.maxx, r.maxy]

def tiff_to_geodataframe(im, metric, date, crs):
    '''
    Convert a tiff image to a geodataframe
    '''
    x_cords = im.coords['x'].values
    y_cords = im.coords['y'].values
    vals = im.values
    dims = vals.shape
    points = []
    v_s = []
    for lat in range(dims[1]):
        y = y_cords[lat]
        for lon in range(dims[2]):
            x = x_cords[lon]
            v = vals[:,lat,lon]
            if isnan(v[0]):
                continue
            points.append(Point(x,y))
            v_s.append(v.item())   
    d = {f'{metric}_{date}': v_s, 'geometry': points} 
    df = gpd.GeoDataFrame(d, crs = crs)
    return df

def get_bearer_token_headers(bearer_token):
    '''
    Get the bearer token headers to be used in the request to the SentinelHub API
    '''
    headers = {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer '+ bearer_token,
    }
    return headers

def get_downloaded_location_img_path(clientName, metric, date, field, extension='tiff'):
    '''
    Get the path of the downloaded image in TIFF based on the:
    '''
    date_dir = f'./data/{clientName}/raw/{metric}/{date}/field_{field}/'
    print(f'True Color Date Dir: {date_dir}')
    os.makedirs(date_dir, exist_ok=True)
    intermediate_dirs = os.listdir(date_dir)
    print(f'Intermediate Dirs: {intermediate_dirs}')
    if len(intermediate_dirs) == 0:
        return None
    imagePath = f'{date_dir}{os.listdir(date_dir)[0]}/response.{extension}'
    print(f'Image Path: {imagePath}')
    if not os.path.exists(imagePath):
        return None
    print(f'Image Path: {imagePath}')
    return imagePath

def get_masked_location_img_path(clientName, metric, date, field):
    '''
    Get the path of the downloaded image after applying the mask in TIFF based on the:
    '''
    date_dir = f'./data/{clientName}/processed/{metric}/{date}/field_{field}/'
    imagePath = date_dir + 'masked.tiff'
    return imagePath

def get_curated_location_img_path(clientName, metric, date, field):
    '''
    Get the path of the downloaded image after applying the mask and converting it to geojson formay based on the:
    '''
    date_dir = f'./data/{clientName}/curated/{metric}/{date}/field_{field}/'
    imagePath = date_dir + 'masked.geojson'

    if os.path.exists(imagePath):
        return imagePath
    else:
        return None

def parse_app_config(path=r'config-fgm-dev.yaml'):
    config = confuse.Configuration('CropHealth', __name__)
    config.set_file(path)
    return config


def fix_image(img):
    def normalize(band):
        band_min, band_max = (band.min(), band.max())
        return ((band-band_min)/((band_max - band_min)))
    def brighten(band):
        alpha=3
        beta=0
        return np.clip(alpha*band+beta, 0,255)
    def gammacorr(band):
        gamma=0.9
        return np.power(band, 1/gamma)
    red   = img[:, :, 0]
    green = img[:, :, 1]
    blue  = img[:, :, 2]
    red_b=brighten(red)
    blue_b=brighten(blue)
    green_b=brighten(green)
    red_bg=gammacorr(red_b)
    blue_bg=gammacorr(blue_b)
    green_bg=gammacorr(green_b)
    red_bgn = normalize(red_bg)
    green_bgn = normalize(green_bg)
    blue_bgn = normalize(blue_bg)
    rgb_composite_bgn= np.dstack((red_b, green_b, blue_b))
    return rgb_composite_bgn


def creat_gif(dataset, gif_name, duration=50):
    '''
    Create a gif from a list of images
    '''
    imgs = [Image.fromarray((255*img).astype(np.uint8)) for img in dataset]
    # duration is the number of milliseconds between frames; this is 40 frames per second
    imgs[0].save(gif_name, save_all=True, append_images=imgs[1:], duration=duration, loop=1)


def add_lat_lon_to_gdf_from_geometry(gdf):
    gdf['Lat'] = gdf['geometry'].apply(lambda p: p.x)
    gdf['Lon'] = gdf['geometry'].apply(lambda p: p.y)
    return gdf

def gdf_column_to_one_band_array(gdf, column_name):
    gdf = gdf.sort_values(by=['Lat', 'Lon'])
    gdf = gdf.reset_index(drop=True)
    unique_lats_count = gdf['Lat'].nunique()
    unique_lons_count = gdf['Lon'].nunique()
    rows_arr = [[] for i in range(unique_lats_count)]
    column_values = gdf[column_name].values
    for i in tqdm(range(len(column_values))):
        row_index = i // unique_lons_count
        rows_arr[row_index].append(column_values[i])

    max_row_length = max([len(row) for row in rows_arr])
    for row in rows_arr:
        while len(row) < max_row_length:
            row.append(0)

    rows_arr = np.array(rows_arr)
    return rows_arr