import json
import os
import urllib.request
from django.core.management.base import BaseCommand
from django.core.files import File
from django.conf import settings
from django.utils.text import slugify
from api.models import Category, Flavor

class Command(BaseCommand):
    help = 'Adds legacy flavors from JSON files in the legacy/ folder'

    def download_image(self, url, flavor_name):
        if not url:
            return None
        try:
            safe_name = slugify(flavor_name)
            ext = url.split('.')[-1].split('?')[0].lower()
            if ext not in ['jpg', 'jpeg', 'png', 'webp', 'gif']:
                ext = 'png'
            
            filename = f"legacy_{safe_name}.{ext}"
            filepath = os.path.join(settings.MEDIA_ROOT, 'flavors', filename)
            
            os.makedirs(os.path.dirname(filepath), exist_ok=True)

            req = urllib.request.Request(url, headers={'User-Agent': 'Mozilla/5.0'})
            with urllib.request.urlopen(req, timeout=10) as response:
                content = response.read()
                
            if not content:
                return None

            if os.path.exists(filepath):
                os.remove(filepath)

            with open(filepath, 'wb') as f:
                f.write(content)
            
            return f"flavors/{filename}"
        except Exception as e:
            self.stdout.write(self.style.WARNING(f"Failed to download image for {flavor_name}: {e}"))
            return None

    def handle(self, *args, **options):
        # We no longer delete everything to preserve user data like ratings
        # Instead, we update existing entries.

        cat_map = {
            'energy': Category.objects.get_or_create(name='Energy', defaults={'slug': 'energy'})[0],
            'hydration': Category.objects.get_or_create(name='Hydration', defaults={'slug': 'hydration'})[0],
            'iced-tea': Category.objects.get_or_create(name='Iced Tea', defaults={'slug': 'iced-tea'})[0],
            'milkshake': Category.objects.get_or_create(name='Milkshake', defaults={'slug': 'milkshake'})[0],
            'packs': Category.objects.get_or_create(name='Packs and other', defaults={'slug': 'packs-and-other'})[0],
        }

        legacy_dir = os.path.join(settings.BASE_DIR, 'legacy')
        if not os.path.exists(legacy_dir):
            legacy_dir = os.path.join(settings.BASE_DIR, '..', 'legacy')
            
        if not os.path.exists(legacy_dir):
            self.stdout.write(self.style.ERROR(f"Legacy directory not found."))
            return

        json_files = [f for f in os.listdir(legacy_dir) if f.endswith('.json')]
        processed_count = 0

        for json_file in json_files:
            file_path = os.path.join(legacy_dir, json_file)
            file_lower = json_file.lower()
            
            # Determine category from filename
            if 'energy' in file_lower:
                file_cat = cat_map['energy']
            elif 'iced_tea' in file_lower or 'iced-tea' in file_lower:
                file_cat = cat_map['iced-tea']
            elif 'hydration' in file_lower:
                file_cat = cat_map['hydration']
            elif 'milkshake' in file_lower:
                file_cat = cat_map['milkshake']
            else:
                file_cat = None

            with open(file_path, 'r', encoding='utf-8') as f:
                data_list = json.load(f)
            
            for data in data_list:
                name = data.get('Name')
                desc = data.get('Beschreibung')
                taste = data.get('Geschmack')
                status_text = data.get('Status')
                image_url = data.get('Bild_URL')

                full_desc = f"**Geschmack:** {taste}\n\n{desc}\n\n**Status:** {status_text}"
                
                # Determine final category
                cat = file_cat
                if not cat:
                    # Fallback to name/desc detection if filename was ambiguous
                    if "hydration" in name.lower() or "hydration" in desc.lower():
                        cat = cat_map['hydration']
                    elif "iced tea" in name.lower() or "eistee" in name.lower():
                        cat = cat_map['iced-tea']
                    elif "milkshake" in name.lower():
                        cat = cat_map['milkshake']
                    elif any(k in name.lower() for k in ['bundle', 'set', 'box', 'probe', 'sample', 'taster', 'shaker', 'starter']):
                        cat = cat_map['packs']
                    else:
                        cat = cat_map['energy'] # Ultimate fallback

                # Try to find existing flavor by name and category
                flavor = Flavor.objects.filter(name=name, category=cat, is_legacy=True).first()
                
                if not flavor:
                    flavor = Flavor(
                        name=name,
                        category=cat,
                        is_legacy=True,
                        external_id=None
                    )
                    self.stdout.write(f"Adding new legacy flavor: {name}")
                else:
                    self.stdout.write(f"Updating legacy flavor: {name}")

                flavor.description = full_desc
                flavor.is_available = False # Legacy is always unavailable via API

                if image_url:
                    # Check if local file exists
                    file_exists = False
                    if flavor.image:
                        abs_path = os.path.join(settings.MEDIA_ROOT, flavor.image.name)
                        if os.path.exists(abs_path):
                            file_exists = True

                    # Download if missing OR if image_url changed
                    if not file_exists or flavor.image_url != image_url:
                        rel_path = self.download_image(image_url, name)
                        if rel_path:
                            flavor.image = rel_path
                            self.stdout.write(f"  -> Updated image for: {name}")
                
                flavor.image_url = image_url
                flavor.save()
                processed_count += 1

        self.stdout.write(self.style.SUCCESS(f"Finished! Processed {processed_count} legacy flavors."))