import json
import os
import time
import urllib.request
import urllib.parse
from urllib.error import HTTPError, URLError

# Configuration
DATA_FILE = os.path.join('data', 'prompts.json')
IMAGE_DIR = os.path.join('public', 'images', 'prompts')
CATEGORY_MAP = {
    'Man': 'NAM',
    'Beauty': 'NỮ',
    'Girl': 'NỮ',
    'Female': 'NỮ',
    'Woman': 'NỮ',
    'Kid': 'TRẺ EM',
    'Baby': 'TRẺ EM',
    'Couple': 'COUPLE',
    'Birthday': 'SINH NHẬT',
    'Sinh nhật': 'SINH NHẬT',
    'Halloween': 'HALLOWEEN',
    'Noel': 'NOEL',
    'Christmas': 'NOEL',
    'Tet': 'NEW YEAR',
    'New Year': 'NEW YEAR',
    'Trung thu': 'TRUNG THU',
    'Mom': 'CHA - MẸ',
    'Family': 'CHA - MẸ',
    'Maternity': 'MẸ BẦU',
    'Bau': 'MẸ BẦU',
    'Other': 'ĐẶC BIỆT'
}
DEFAULT_CATEGORY = 'ĐẶC BIỆT'

def ensure_dir(directory):
    if not os.path.exists(directory):
        os.makedirs(directory)

def download_image(url, filename):
    if not url or not url.startswith('http'):
        return None
    
    target_path = os.path.join(IMAGE_DIR, filename)
    
    # Check if already exists
    if os.path.exists(target_path):
        return f'/images/prompts/{filename}'

    try:
        print(f"Downloading {url}...")
        # Add headers to mimic browser to avoid 403s
        req = urllib.request.Request(
            url, 
            data=None, 
            headers={
                'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
            }
        )
        with urllib.request.urlopen(req) as response, open(target_path, 'wb') as out_file:
            data = response.read()
            out_file.write(data)
        return f'/images/prompts/{filename}'
    except Exception as e:
        print(f"Failed to download {url}: {e}")
        return None

def normalize_category(cat):
    if not cat:
        return DEFAULT_CATEGORY
    
    # Direct match
    if cat in CATEGORY_MAP:
        return CATEGORY_MAP[cat]
    
    # Case insensitive check
    for key, val in CATEGORY_MAP.items():
        if key.lower() == cat.lower():
            return val
            
    # Partial match heuristics
    cat_lower = cat.lower()
    if 'man' in cat_lower and 'wo' not in cat_lower: return 'NAM'
    if 'girl' in cat_lower or 'woman' in cat_lower or 'lady' in cat_lower: return 'NỮ'
    if 'kid' in cat_lower or 'baby' in cat_lower or 'boy' in cat_lower: return 'TRẺ EM'
    if 'couple' in cat_lower: return 'COUPLE'
    if 'halloween' in cat_lower: return 'HALLOWEEN'
    if 'christmas' in cat_lower or 'noel' in cat_lower: return 'NOEL'
    
    return cat.upper() # Default to uppercasing unknown ones, effectively "Other" or custom

def main():
    print("Starting processing...")
    ensure_dir(IMAGE_DIR)
    
    try:
        with open(DATA_FILE, 'r', encoding='utf-8') as f:
            data = json.load(f)
    except FileNotFoundError:
        print(f"File not found: {DATA_FILE}")
        return

    prompts = data.get('prompts', [])
    processed_count = 0
    updated_categories = 0
    downloaded_images = 0

    for p in prompts:
        # 1. Image Caching
        original_url = None
        if p.get('images') and len(p['images']) > 0:
            original_url = p['images'][0]
        elif p.get('imageUrl'):
            original_url = p['imageUrl']

        if original_url and original_url.startswith('http'):
            # Create a filename based on ID or source_url hash to avoid collisions
            # Using prompt ID is safest if it exists
            ext = '.png'
            if '.jpg' in original_url.lower(): ext = '.jpg'
            if '.jpeg' in original_url.lower(): ext = '.jpeg'
            if '.webp' in original_url.lower(): ext = '.webp'
            
            # Sanitizing ID for filename
            safe_id = str(p.get('id', 'unknown')).replace('/', '_').replace('\\', '_')
            filename = f"{safe_id}{ext}"
            
            local_path = download_image(original_url, filename)
            if local_path:
                p['images'] = [local_path]
                if 'imageUrl' in p:
                    p['imageUrl'] = local_path # Update legacy field too
                downloaded_images += 1

        # 2. Category Normalization
        old_cat = p.get('category', '')
        new_cat = normalize_category(old_cat)
        if old_cat != new_cat:
            p['category'] = new_cat
            updated_categories += 1
            
        processed_count += 1
        if processed_count % 10 == 0:
             print(f"Processed {processed_count} prompts...")

    # Update metadata
    data['categories'] = {} # Reset or rebuild logic if needed
    categories_set = set(p['category'] for p in prompts)
    data['categories']['style'] = list(categories_set)
    data['last_updated'] = time.strftime("%Y-%m-%dT%H:%M:%S.000Z", time.gmtime())

    with open(DATA_FILE, 'w', encoding='utf-8') as f:
        json.dump(data, f, indent=2, ensure_ascii=False)

    print(f"Done! Processed {processed_count} prompts.")
    print(f"Updated categories for {updated_categories} items.")
    print(f"Downloaded/Verified {downloaded_images} images.")

if __name__ == "__main__":
    main()