"""Feedback model"""
import os
import uuid
from datetime import datetime
import yaml
from flask import current_app


class Feedback:
    """Feedback submission model

    Attributes:
        feedback_id: Unique feedback identifier (UUID)
        product_id: Associated product ID
        submitted_at: Submission timestamp (ISO 8601)
        status: Feedback status ('new', 'analyzing', 'analyzed', 'analysis_failed', 'archived')
        content_preview: First 200 chars of feedback text
        has_attachments: Whether feedback has file attachments
        attachment_count: Number of attached files
        original_language: Detected language of feedback (set during analysis)
        category: Feedback category (set during analysis)
    """

    VALID_STATUSES = ['new', 'analyzing', 'analyzed', 'analysis_failed', 'archived']

    def __init__(self, feedback_id, product_id, submitted_at=None, status='new',
                 content_preview='', has_attachments=False, attachment_count=0,
                 original_language=None, category=None):
        self.feedback_id = feedback_id
        self.product_id = product_id
        self.submitted_at = submitted_at or datetime.utcnow().isoformat()
        self.status = status
        self.content_preview = content_preview
        self.has_attachments = has_attachments
        self.attachment_count = attachment_count
        self.original_language = original_language
        self.category = category

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

        Returns:
            dict: Feedback metadata
        """
        data = {
            'feedback_id': self.feedback_id,
            'product_id': self.product_id,
            'submitted_at': self.submitted_at,
            'status': self.status,
            'content_preview': self.content_preview,
            'has_attachments': self.has_attachments,
            'attachment_count': self.attachment_count
        }

        if self.original_language:
            data['original_language'] = self.original_language

        if self.category:
            data['category'] = self.category

        return data

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

        Args:
            data: Dictionary with feedback data

        Returns:
            Feedback: Feedback instance
        """
        return cls(
            feedback_id=data['feedback_id'],
            product_id=data['product_id'],
            submitted_at=data.get('submitted_at'),
            status=data.get('status', 'new'),
            content_preview=data.get('content_preview', ''),
            has_attachments=data.get('has_attachments', False),
            attachment_count=data.get('attachment_count', 0),
            original_language=data.get('original_language'),
            category=data.get('category')
        )

    @staticmethod
    def generate_id():
        """Generate unique feedback ID

        Returns:
            str: UUID-based feedback ID
        """
        return str(uuid.uuid4())

    @staticmethod
    def _get_feedback_dir(product_id, feedback_id):
        """Get feedback directory path

        Args:
            product_id: Product ID
            feedback_id: Feedback ID

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

    @staticmethod
    def _get_metadata_file(product_id, feedback_id):
        """Get metadata file path

        Args:
            product_id: Product ID
            feedback_id: Feedback ID

        Returns:
            str: Path to metadata.yaml
        """
        feedback_dir = Feedback._get_feedback_dir(product_id, feedback_id)
        return os.path.join(feedback_dir, 'metadata.yaml')

    @staticmethod
    def _get_content_file(product_id, feedback_id):
        """Get content file path

        Args:
            product_id: Product ID
            feedback_id: Feedback ID

        Returns:
            str: Path to content.txt
        """
        feedback_dir = Feedback._get_feedback_dir(product_id, feedback_id)
        return os.path.join(feedback_dir, 'content.txt')

    @staticmethod
    def _get_attachments_dir(product_id, feedback_id):
        """Get attachments directory path

        Args:
            product_id: Product ID
            feedback_id: Feedback ID

        Returns:
            str: Path to attachments directory
        """
        feedback_dir = Feedback._get_feedback_dir(product_id, feedback_id)
        return os.path.join(feedback_dir, 'attachments')

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

        Args:
            product_id: Product ID
            feedback_id: Feedback ID

        Returns:
            Feedback or None: Feedback instance if found, None otherwise
        """
        metadata_file = cls._get_metadata_file(product_id, feedback_id)

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

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

        return cls.from_dict(data)

    @classmethod
    def get_all_for_product(cls, product_id):
        """Get all feedback for a product

        Args:
            product_id: Product ID

        Returns:
            list: List of Feedback instances, sorted by submitted_at (newest first)
        """
        feedback_list = []
        feedback_base_dir = os.path.join(
            current_app.config['DATA_DIR'],
            'products',
            product_id,
            'feedback'
        )

        if not os.path.exists(feedback_base_dir):
            return feedback_list

        for feedback_id in os.listdir(feedback_base_dir):
            feedback_dir = os.path.join(feedback_base_dir, feedback_id)

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

            feedback = cls.get_by_id(product_id, feedback_id)
            if feedback:
                feedback_list.append(feedback)

        # Sort by submitted_at (newest first)
        feedback_list.sort(key=lambda f: f.submitted_at, reverse=True)

        return feedback_list

    def save_metadata(self):
        """Save feedback metadata to filesystem"""
        feedback_dir = self._get_feedback_dir(self.product_id, self.feedback_id)
        os.makedirs(feedback_dir, exist_ok=True)

        metadata_file = self._get_metadata_file(self.product_id, self.feedback_id)

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

    def get_content(self):
        """Load feedback content text

        Returns:
            str or None: Feedback content if exists, None otherwise
        """
        content_file = self._get_content_file(self.product_id, self.feedback_id)

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

        with open(content_file, 'r') as f:
            return f.read()

    def get_attachments(self):
        """Get list of attachment filenames

        Returns:
            list: List of attachment filenames
        """
        attachments_dir = self._get_attachments_dir(self.product_id, self.feedback_id)

        if not os.path.exists(attachments_dir):
            return []

        return [f for f in os.listdir(attachments_dir)
                if os.path.isfile(os.path.join(attachments_dir, f))]

    def validate_status(self):
        """Validate feedback status

        Returns:
            bool: True if status is valid, False otherwise
        """
        return self.status in self.VALID_STATUSES