from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, UserMixin
from datetime import datetime


db = SQLAlchemy()
login_manager = LoginManager()


class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    display_name = db.Column(db.String(120), nullable=False)
    password_hash = db.Column(db.String(255), nullable=False)
    role = db.Column(db.String(30), nullable=False, default='user')
    created_at = db.Column(db.DateTime, default=datetime.utcnow)


class DocumentationEntry(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    work_date = db.Column(db.Date, nullable=False)
    category = db.Column(db.String(100), nullable=False)
    system_name = db.Column(db.String(120), nullable=True)
    priority = db.Column(db.String(20), nullable=False, default='mittel')
    status = db.Column(db.String(30), nullable=False, default='offen')
    content = db.Column(db.Text, nullable=False)
    tags = db.Column(db.String(255), nullable=True)
    created_by = db.Column(db.String(120), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)


class DocumentationTemplate(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(120), nullable=False, unique=True)
    description = db.Column(db.String(255), nullable=True)
    content = db.Column(db.Text, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)


class TaskItem(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    description = db.Column(db.Text, nullable=True)
    due_date = db.Column(db.Date, nullable=True)
    status = db.Column(db.String(30), nullable=False, default='offen')
    priority = db.Column(db.String(20), nullable=False, default='mittel')
    created_at = db.Column(db.DateTime, default=datetime.utcnow)


@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))