from . import db
from flask_login import UserMixin
from datetime import datetime

# User roles: admin, technician, customer
class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    password_hash = db.Column(db.String(128), nullable=False)
    role = db.Column(db.String(20), default='customer')
    customer = db.relationship('Customer', uselist=False, backref='user')

class Customer(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(120))
    email = db.Column(db.String(120), unique=True)
    phone = db.Column(db.String(20))
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    repairs = db.relationship('RepairJob', backref='customer')

class Technician(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(120))
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    repairs = db.relationship('RepairJob', backref='technician')

class RepairJob(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    tracking_number = db.Column(db.String(50), unique=True)
    device = db.Column(db.String(120))
    description = db.Column(db.Text)
    status = db.Column(db.String(50), default='New')
    customer_id = db.Column(db.Integer, db.ForeignKey('customer.id'))
    technician_id = db.Column(db.Integer, db.ForeignKey('technician.id'))
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    cost_estimate = db.Column(db.Float)
    final_cost = db.Column(db.Float)
    parts_used = db.relationship('RepairPart', backref='repair')
    barcode_path = db.Column(db.String(256))
    notes = db.relationship('RepairNote', backref='repair')

class RepairNote(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    repair_id = db.Column(db.Integer, db.ForeignKey('repair_job.id'))
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    note = db.Column(db.Text)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)

class RepairPart(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    repair_id = db.Column(db.Integer, db.ForeignKey('repair_job.id'))
    part_id = db.Column(db.Integer, db.ForeignKey('inventory_item.id'))
    quantity = db.Column(db.Integer)

class InventoryItem(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    part_name = db.Column(db.String(120))
    quantity = db.Column(db.Integer)
    low_stock_threshold = db.Column(db.Integer, default=1)

class AuditLog(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    action = db.Column(db.String(256))
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)
    details = db.Column(db.Text)