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


db = SQLAlchemy()


def utcnow():
    return datetime.now(timezone.utc)


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(120), unique=True, nullable=False)
    email = db.Column(db.String(255), unique=True, nullable=False)
    display_name = db.Column(db.String(255), nullable=False)
    password_hash = db.Column(db.String(255), nullable=False)
    role = db.Column(db.String(20), nullable=False, default='streamer')
    active = db.Column(db.Boolean, nullable=False, default=True)
    force_password_change = db.Column(db.Boolean, nullable=False, default=True)
    reset_token = db.Column(db.String(255), nullable=True)
    reset_token_expires_at = db.Column(db.DateTime(timezone=True), nullable=True)
    created_at = db.Column(db.DateTime(timezone=True), nullable=False, default=utcnow)
    updated_at = db.Column(db.DateTime(timezone=True), nullable=False, default=utcnow, onupdate=utcnow)

    stream = db.relationship('Stream', back_populates='user', uselist=False)

    def set_password(self, raw: str):
        self.password_hash = generate_password_hash(raw)

    def check_password(self, raw: str) -> bool:
        return check_password_hash(self.password_hash, raw)


class Stream(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False, unique=True)
    name = db.Column(db.String(255), nullable=False)
    slug = db.Column(db.String(120), unique=True, nullable=False)
    token = db.Column(db.String(255), nullable=False)
    chat_type = db.Column(db.String(30), nullable=False, default='none')
    chat_url = db.Column(db.Text, nullable=True)
    notes = db.Column(db.Text, nullable=True)
    active = db.Column(db.Boolean, nullable=False, default=True)
    is_live = db.Column(db.Boolean, nullable=False, default=False)
    created_at = db.Column(db.DateTime(timezone=True), nullable=False, default=utcnow)
    updated_at = db.Column(db.DateTime(timezone=True), nullable=False, default=utcnow, onupdate=utcnow)

    user = db.relationship('User', back_populates='stream')
    sessions = db.relationship('StreamSession', back_populates='stream', cascade='all, delete-orphan')
    logs = db.relationship('EventLog', back_populates='stream', cascade='all, delete-orphan')


class StreamSession(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    stream_id = db.Column(db.Integer, db.ForeignKey('stream.id'), nullable=False)
    started_at = db.Column(db.DateTime(timezone=True), nullable=False, default=utcnow)
    ended_at = db.Column(db.DateTime(timezone=True), nullable=True)
    status = db.Column(db.String(50), nullable=False, default='offline')
    source_type = db.Column(db.String(50), nullable=True)
    source_id = db.Column(db.String(120), nullable=True)
    publisher_ip = db.Column(db.String(64), nullable=True)
    video_codec = db.Column(db.String(64), nullable=True)
    audio_codec = db.Column(db.String(64), nullable=True)
    audio_channels = db.Column(db.String(32), nullable=True)
    audio_sample_rate = db.Column(db.String(32), nullable=True)
    width = db.Column(db.Integer, nullable=True)
    height = db.Column(db.Integer, nullable=True)
    fps = db.Column(db.String(32), nullable=True)
    bitrate = db.Column(db.String(64), nullable=True)

    stream = db.relationship('Stream', back_populates='sessions')


class EventLog(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    stream_id = db.Column(db.Integer, db.ForeignKey('stream.id'), nullable=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=True)
    level = db.Column(db.String(20), nullable=False, default='info')
    message = db.Column(db.Text, nullable=False)
    created_at = db.Column(db.DateTime(timezone=True), nullable=False, default=utcnow)

    stream = db.relationship('Stream', back_populates='logs')