from datetime import datetime
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash

db = SQLAlchemy()


class User(db.Model):
    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)
    password_hash = db.Column(db.String(256), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    is_admin = db.Column(db.Boolean, default=False)

    # Relationships
    blog_posts = db.relationship('BlogPost', backref='author', lazy='dynamic')
    forum_topics = db.relationship('ForumTopic', backref='author', lazy='dynamic')
    forum_replies = db.relationship('ForumReply', backref='author', lazy='dynamic')

    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

    def __repr__(self):
        return f'<User {self.username}>'


class BlogPost(db.Model):
    __tablename__ = 'blog_posts'

    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    slug = db.Column(db.String(200), unique=True, nullable=False)
    content = db.Column(db.Text, nullable=False)
    excerpt = db.Column(db.String(500))
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    published = db.Column(db.Boolean, default=False)

    def __repr__(self):
        return f'<BlogPost {self.title}>'


class ForumCategory(db.Model):
    __tablename__ = 'forum_categories'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), nullable=False)
    slug = db.Column(db.String(100), unique=True, nullable=False)
    description = db.Column(db.String(500))
    order = db.Column(db.Integer, default=0)

    # Relationships
    topics = db.relationship('ForumTopic', backref='category', lazy='dynamic')

    def __repr__(self):
        return f'<ForumCategory {self.name}>'


class ForumTopic(db.Model):
    __tablename__ = 'forum_topics'

    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    content = db.Column(db.Text, nullable=False)
    category_id = db.Column(db.Integer, db.ForeignKey('forum_categories.id'), nullable=False)
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    is_pinned = db.Column(db.Boolean, default=False)
    is_locked = db.Column(db.Boolean, default=False)

    # Relationships
    replies = db.relationship('ForumReply', backref='topic', lazy='dynamic', order_by='ForumReply.created_at')

    @property
    def reply_count(self):
        return self.replies.count()

    @property
    def last_activity(self):
        last_reply = self.replies.order_by(ForumReply.created_at.desc()).first()
        return last_reply.created_at if last_reply else self.created_at

    def __repr__(self):
        return f'<ForumTopic {self.title}>'


class ForumReply(db.Model):
    __tablename__ = 'forum_replies'

    id = db.Column(db.Integer, primary_key=True)
    content = db.Column(db.Text, nullable=False)
    topic_id = db.Column(db.Integer, db.ForeignKey('forum_topics.id'), nullable=False)
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    def __repr__(self):
        return f'<ForumReply {self.id}>'


class ContactMessage(db.Model):
    __tablename__ = 'contact_messages'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), nullable=False)
    email = db.Column(db.String(120), nullable=False)
    subject = db.Column(db.String(200), nullable=False)
    message = db.Column(db.Text, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    read = db.Column(db.Boolean, default=False)

    def __repr__(self):
        return f'<ContactMessage {self.subject}>'