from uuid import uuid4
from datetime import datetime
import os, requests, config, json, funcs, cv2
from snapchat import get_stories, get_highlight_stories, get_all_users_data

directory = "snapchat"
data_directory = "data"

def get_existing_snap_ids(directory):
	existing_snap_ids = set()
	for root, _, files in os.walk(directory):
		for file in files:
			if '~' not in file:
				continue
			
			filename, _ = os.path.splitext(file)
			snap_id = filename.split('~')[2]
			existing_snap_ids.add(snap_id)
	return existing_snap_ids

def find_duplicate_snap(existing_snaps, snap_id, username):
	for snap in existing_snaps:
		if username == snap[2]:
			if snap_id in snap[1]:
				return snap
	return False
	
def archive_data(data, username):
	data_filename = f"{username}~{datetime.now().strftime('%Y-%m-%d_%H-%M-%S')}.json"
	data_filepath = os.path.join(data_directory, data_filename)
	with open(data_filepath, 'w') as f:
		f.write(json.dumps(data))
	print(f"Archived data for {username} at {data_filepath}")
	
def get_file_extension(url):
	response = requests.head(url)
	if response.status_code != 200:
		print(f"Failed to access media {url}")
		return None

	content_type = response.headers.get('Content-Type', '')
	if 'image' in content_type:
		return '.jpg'
	elif 'video' in content_type:
		return '.mp4'
	else:
		print(f"Unknown content type for media {url}")
		return None

def download_media(url, filepath):
	if os.path.exists(filepath):
		print(f"File {filepath} already exists. Skipping download.")
		return filepath
	
	response = requests.get(url)
	if response.status_code != 200:
		print(f"Failed to download media {url}")
		return None

	with open(filepath, 'wb') as f:
		f.write(response.content)
	return filepath

def main():
	os.makedirs(directory, exist_ok=True)
	os.makedirs(data_directory, exist_ok=True)
    
	cursor.execute("SELECT username FROM following WHERE platform = 'snapchat' ORDER BY id DESC")
	usernames = [row[0] for row in cursor.fetchall()]
	
	cursor.execute("SELECT id, filename, username FROM media WHERE filename IS NOT NULL AND platform = 'snapchat' ORDER BY id DESC")
	existing_medias = cursor.fetchall()
	
	existing_snap_ids = get_existing_snap_ids(directory)

	snapchat_users_data = get_all_users_data(usernames)

	ready_stories = []

	for username in usernames:
		print(f"Getting stories for {username}...")

		data = snapchat_users_data.get(username)
		if not data:
			print(f"Failed to get data for {username}. Skipping.")
			continue

		archive_data(data, username)
		
		print("Getting stories...")
		stories = get_stories(data)

		print("Getting highlights...")
		stories.extend(get_highlight_stories(data))

		for story in stories:
			snap_id = story['snap_id']
			url = story['url']
			timestamp = story['timestamp']
			
			duplicate_snap = find_duplicate_snap(existing_medias, snap_id, username)
			if duplicate_snap:
				print(f"Media {snap_id} already exists. Skipping download.")
				continue
			
			# Check if media already exists
			if snap_id in existing_snap_ids:
				print(f"Media {snap_id} already exists. Skipping download.")
				continue

			# Determine file extension using HEAD request.
			extension = get_file_extension(url)
			if not extension:
				continue
			
			filename = f"{username}~{timestamp}~{snap_id}{extension}"
			filepath = os.path.join(directory, filename)
			
			# Check if file already exists
			if os.path.exists(filepath):
				print(f"File {filename} already exists. Skipping download.")
				continue
			
			media = {
				'username': username,
				'timestamp': timestamp,
				'filepath': filepath,
				'snap_id': snap_id,
				'original_snap_id': story['original_snap_id'],
				'media_url': url,
			}
			
			ready_stories.append(media)
			print(f"Media {snap_id} ready for download.")
			

	for media in ready_stories:
		# Download the media
		filepath = download_media(url, filepath)
		print(f"Downloaded {filename} at {timestamp}")

		if not filepath:
			continue

		media['filepath'] = filepath

		UploadMedia(media)

def UploadMedia(media):
	username = media['username']
	timestamp = media['timestamp']
	filepath = media['filepath']
	filename = os.path.basename(filepath)
	snap_id = media['snap_id']
	original_snap_id = media['original_snap_id']
	thumbnail_url = None
	phash = None
    
	media_type = funcs.get_media_type(filename)

	file_hash = funcs.calculate_file_hash(filepath)

	post_date = datetime.fromtimestamp(int(timestamp)) if timestamp else datetime.now()

	width, height = funcs.get_media_dimensions(filepath)

	duration = funcs.get_video_duration(filepath)

	if media_type == 'image':
		phash = funcs.generate_phash(filepath)
	elif media_type == 'video':
		try:
			thumb_path = generate_thumbnail(filepath)
			obj_storage.PutFile(thumb_path, f'thumbnails/{filename}')
			thumbnail_url = f"https://storysave.b-cdn.net/thumbnails/{filename}"
			phash = funcs.generate_phash(thumb_path)
			os.remove(thumb_path)
		except:
			print('Error generating thumbnail. Skipping...')
			return False

	server_path = f'media/snaps/{username}/{filename}'
	file_url = f"https://storysave.b-cdn.net/{server_path}"

	obj_storage.PutFile(filepath, server_path)

	query = "INSERT IGNORE INTO media (username, media_type, media_url, width, height, post_type, date, hash, filename, duration, thumbnail, phash, platform, snap_id, original_snap_id) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)"
	values = (username, media_type, file_url, width, height, 'story', post_date, file_hash, filename, duration, thumbnail_url, phash, 'snapchat', snap_id, original_snap_id)

	cursor.execute(query, values)
	db.commit()
	print(f'[{cursor.rowcount}] records updated. File {filename} uploaded to {file_url}')

	os.remove(filepath)

	return True

def generate_thumbnail(filepath):
    thumb_path = f'temp/{uuid4()}.jpg'
    cap = cv2.VideoCapture(filepath)
    ret, frame = cap.read()
    cv2.imwrite(thumb_path, frame)
    cap.release()
    return thumb_path

def get_media_data(filepath):
    filename = os.path.basename(filepath)
    parts = filename.split('~')
    if len(parts) < 3:
        return False

    username = parts[0]
    timestamp = parts[1]
    snap_id = parts[2]
    snap_id = os.path.splitext(snap_id)[0]

    data = {'username': username, 'timestamp': timestamp, 'filepath': filepath, 'media_id': snap_id}

    return data

def process_snap_ids(filenames):
    snap_ids = []
    for filename in filenames:
        snap_id = filename.split('~')[2]
        snap_id = os.path.splitext(snap_id)[0]
        if snap_id not in snap_ids:
            snap_ids.append(snap_id)
            
    return snap_ids

if __name__ == '__main__':
	print('Starting snappy...')

	db, cursor = config.gen_connection()
	obj_storage = config.get_storage()

	main()

	print("Processing completed.")