"""Product model"""
import os
import yaml
from flask import current_app


class Product:
    """Product/Service model

    Attributes:
        product_id: Unique product identifier
        name: Product/service name
        submission_url_slug: URL slug for submission form
        owner_language: Preferred language for product owner
        assigned_owner_ids: List of product owner user IDs
        status: Product status ('active' or 'archived')
    """

    def __init__(self, product_id, name, submission_url_slug, owner_language,
                 assigned_owner_ids, status='active'):
        self.product_id = product_id
        self.name = name
        self.submission_url_slug = submission_url_slug
        self.owner_language = owner_language
        self.assigned_owner_ids = assigned_owner_ids or []
        self.status = status

    def to_dict(self):
        """Convert product to dictionary

        Returns:
            dict: Product data
        """
        return {
            'product_id': self.product_id,
            'name': self.name,
            'submission_url_slug': self.submission_url_slug,
            'owner_language': self.owner_language,
            'assigned_owner_ids': self.assigned_owner_ids,
            'status': self.status
        }

    @classmethod
    def from_dict(cls, data):
        """Create product from dictionary

        Args:
            data: Dictionary with product data

        Returns:
            Product: Product instance
        """
        return cls(
            product_id=data['product_id'],
            name=data['name'],
            submission_url_slug=data['submission_url_slug'],
            owner_language=data['owner_language'],
            assigned_owner_ids=data.get('assigned_owner_ids', []),
            status=data.get('status', 'active')
        )

    @staticmethod
    def _get_product_dir(product_id):
        """Get product directory path

        Args:
            product_id: Product ID

        Returns:
            str: Path to product directory
        """
        return os.path.join(current_app.config['DATA_DIR'], 'products', product_id)

    @staticmethod
    def _get_config_file(product_id):
        """Get product config file path

        Args:
            product_id: Product ID

        Returns:
            str: Path to config.yaml
        """
        product_dir = Product._get_product_dir(product_id)
        return os.path.join(product_dir, 'config.yaml')

    @classmethod
    def get_by_id(cls, product_id):
        """Load product by ID

        Args:
            product_id: Product ID to load

        Returns:
            Product or None: Product instance if found, None otherwise
        """
        config_file = cls._get_config_file(product_id)

        if not os.path.exists(config_file):
            return None

        with open(config_file, 'r') as f:
            data = yaml.safe_load(f)

        return cls.from_dict(data)

    @classmethod
    def get_by_slug(cls, slug):
        """Load product by submission URL slug

        Args:
            slug: Submission URL slug

        Returns:
            Product or None: Product instance if found, None otherwise
        """
        # Scan all product directories
        products_dir = os.path.join(current_app.config['DATA_DIR'], 'products')

        if not os.path.exists(products_dir):
            return None

        for product_id in os.listdir(products_dir):
            product_dir = os.path.join(products_dir, product_id)

            if not os.path.isdir(product_dir):
                continue

            config_file = os.path.join(product_dir, 'config.yaml')

            if not os.path.exists(config_file):
                continue

            with open(config_file, 'r') as f:
                data = yaml.safe_load(f)

            if data.get('submission_url_slug') == slug:
                return cls.from_dict(data)

        return None

    @classmethod
    def get_all(cls):
        """Get all products

        Returns:
            list: List of Product instances
        """
        products = []
        products_dir = os.path.join(current_app.config['DATA_DIR'], 'products')

        if not os.path.exists(products_dir):
            return products

        for product_id in os.listdir(products_dir):
            product = cls.get_by_id(product_id)
            if product:
                products.append(product)

        return products

    @classmethod
    def load_active(cls):
        """Load all active products, sorted alphabetically by name then product_id

        Returns:
            list[Product]: Active products with valid submission_url_slug, sorted by:
                           1. name (case-insensitive alphabetical)
                           2. product_id (alphabetical) as tiebreaker

        Products with missing/invalid submission_url_slug are excluded.
        """
        all_products = cls.get_all()
        active = [p for p in all_products
                  if p.status == 'active' and p.submission_url_slug]
        return sorted(active, key=lambda p: (p.name.lower(), p.product_id))

    def save(self):
        """Save product to filesystem"""
        product_dir = self._get_product_dir(self.product_id)
        os.makedirs(product_dir, exist_ok=True)

        config_file = self._get_config_file(self.product_id)

        with open(config_file, 'w') as f:
            yaml.dump(self.to_dict(), f, default_flow_style=False)

    def delete(self):
        """Delete product (not implemented - use archive instead)"""
        raise NotImplementedError("Products should be archived, not deleted")

    def is_active(self):
        """Check if product is active

        Returns:
            bool: True if status is 'active', False otherwise
        """
        return self.status == 'active'

    def is_archived(self):
        """Check if product is archived

        Returns:
            bool: True if status is 'archived', False otherwise
        """
        return self.status == 'archived'