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from datetime import datetime, date
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from extensions import db


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

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False, index=True)
    email = db.Column(db.String(120), unique=True, nullable=True)
    password_hash = db.Column(db.String(256), nullable=False)
    full_name = db.Column(db.String(200), nullable=False)
    role = db.Column(db.String(20), nullable=False, default='employee')
    is_active = db.Column(db.Boolean, default=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    senior_expert_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=True)
    telegram_chat_id = db.Column(db.String(100), nullable=True)
    profile_pic = db.Column(db.String(300), nullable=True)
    grade = db.Column(db.String(50), nullable=True)
    project_start_date = db.Column(db.Date, nullable=True)
    phone = db.Column(db.String(30), nullable=True)
    telegram = db.Column(db.String(100), nullable=True)
    emergency_contact = db.Column(db.String(200), nullable=True)
    emergency_contact_phone = db.Column(db.String(30), nullable=True)
    position = db.Column(db.String(100), nullable=True)
    delegated_admin_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=True)
    previous_review_rating = db.Column(db.String(50), nullable=True)

    senior_expert = db.relationship('User', remote_side=[id], backref='subordinates', foreign_keys=[senior_expert_id])
    delegated_admin = db.relationship('User', remote_side=[id], foreign_keys=[delegated_admin_id])

    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 has_role(self, *roles):
        return self.role in roles

    def _is_admin(self):
        if self.role in ('admin', 'sm'):
            return True
        if self.position == 'руководитель':
            return True
        if self.delegated_admin_id is not None:
            return True
        return False

    def can_view_employee(self, employee):
        if not self.is_authenticated:
            return False
        if self._is_admin():
            return True
        if self.role == 'guest':
            return True
        if self.id == employee.id:
            return True
        if employee.is_active:
            return True
        return False

    def can_edit(self):
        return self._is_admin()

    def get_visible_users(self):
        if self._is_admin():
            return User.query.filter_by(is_active=True).all()
        if self.role == 'guest':
            return User.query.filter_by(is_active=True).all()
        if self.role == 'senior_expert':
            visible = [self]
            visible.extend(User.query.filter_by(senior_expert_id=self.id, is_active=True).all())
            return visible
        return [self]


class KpiDefinition(db.Model):
    __tablename__ = 'kpi_definitions'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(200), nullable=False)
    description = db.Column(db.Text, nullable=True)
    unit = db.Column(db.String(50), nullable=True)
    category = db.Column(db.String(100), nullable=True)
    target_value = db.Column(db.Float, nullable=True)
    is_active = db.Column(db.Boolean, default=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)


class KpiValue(db.Model):
    __tablename__ = 'kpi_values'

    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    kpi_id = db.Column(db.Integer, db.ForeignKey('kpi_definitions.id'), nullable=False, index=True)
    value = db.Column(db.Float, nullable=True)
    month = db.Column(db.Integer, nullable=False)
    year = db.Column(db.Integer, nullable=False)
    uploaded_file_id = db.Column(db.Integer, db.ForeignKey('uploaded_files.id'), nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    user = db.relationship('User', backref='kpi_values')
    kpi = db.relationship('KpiDefinition', backref='values')
    uploaded_file = db.relationship('UploadedFile', backref='kpi_values')


class UploadedFile(db.Model):
    __tablename__ = 'uploaded_files'

    id = db.Column(db.Integer, primary_key=True)
    filename = db.Column(db.String(300), nullable=False)
    original_name = db.Column(db.String(300), nullable=False)
    file_type = db.Column(db.String(10), nullable=False)
    file_size = db.Column(db.Integer, default=0)
    description = db.Column(db.String(500), nullable=True)
    kpi_name = db.Column(db.String(200), nullable=True)
    uploaded_by = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=True)
    upload_date = db.Column(db.DateTime, default=datetime.utcnow)

    uploader = db.relationship('User', backref='uploads')


class Notification(db.Model):
    __tablename__ = 'notifications'
    __table_args__ = (
        db.Index('ix_notif_user_read', 'user_id', 'is_read'),
    )
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    message = db.Column(db.Text, nullable=False)
    type = db.Column(db.String(50), default='info')
    is_read = db.Column(db.Boolean, default=False)
    link = db.Column(db.String(500), nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    user = db.relationship('User', backref='notifications')


class Task(db.Model):
    __tablename__ = 'tasks'

    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(300), nullable=False)
    description = db.Column(db.Text, nullable=True)
    assigned_to = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    assigned_by = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=True)
    status = db.Column(db.String(20), default='pending')
    priority = db.Column(db.String(20), default='medium')
    due_date = db.Column(db.Date, nullable=True)
    comment = db.Column(db.Text, nullable=True)
    rework_comment = db.Column(db.Text, nullable=True)
    completed_at = db.Column(db.DateTime, nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    assignee = db.relationship('User', foreign_keys=[assigned_to], backref='assigned_tasks')
    assigner = db.relationship('User', foreign_keys=[assigned_by], backref='created_tasks')


class KpiWeeklyData(db.Model):
    __tablename__ = 'kpi_weekly_data'
    __table_args__ = (
        db.Index('ix_kwd_week_cat_metric', 'week_start', 'category', 'metric_name'),
    )
    id = db.Column(db.Integer, primary_key=True)
    category = db.Column(db.String(100), nullable=False)
    metric_name = db.Column(db.String(200), nullable=False)
    week_start = db.Column(db.Date, nullable=False, index=True)
    value = db.Column(db.String(50), nullable=True)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)


class EmployeeKpiValue(db.Model):
    __tablename__ = 'employee_kpi_values'
    __table_args__ = (
        db.Index('ix_ekv_lookup', 'user_id', 'week_start', 'category', 'metric_name'),
        db.Index('ix_ekv_week', 'week_start'),
    )
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    category = db.Column(db.String(100), nullable=False)
    metric_name = db.Column(db.String(200), nullable=False)
    week_start = db.Column(db.Date, nullable=False, index=True)
    value_date = db.Column(db.Date, nullable=True)
    plan_value = db.Column(db.String(50), nullable=True)
    fact_value = db.Column(db.String(50), nullable=True)
    aggregation = db.Column(db.String(10), default='sum')
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    user = db.relationship('User', backref='kpi_entries')


class EmployeeMapping(db.Model):
    __tablename__ = 'employee_mappings'
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, unique=True, index=True)
    rebus_login = db.Column(db.String(200), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    user = db.relationship('User', backref='rebus_mapping', uselist=False)


class Training(db.Model):
    __tablename__ = 'trainings'

    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(300), nullable=False)
    description = db.Column(db.Text, nullable=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    date = db.Column(db.Date, nullable=False, default=date.today)
    hours = db.Column(db.Float, nullable=True)
    status = db.Column(db.String(20), default='completed')
    file_path = db.Column(db.String(300), nullable=True)
    original_name = db.Column(db.String(300), nullable=True)
    file_size = db.Column(db.Integer, default=0)
    uploaded_by = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=True)
    upload_date = db.Column(db.DateTime, default=datetime.utcnow)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    user = db.relationship('User', foreign_keys=[user_id], backref='trainings')
    uploader = db.relationship('User', foreign_keys=[uploaded_by], backref='uploaded_trainings')


class Audit(db.Model):
    __tablename__ = 'audits'

    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    file_name = db.Column(db.String(300), nullable=False)
    original_name = db.Column(db.String(300), nullable=False)
    audit_type = db.Column(db.String(20), nullable=False, default='audit')
    file_size = db.Column(db.Integer, default=0)
    uploaded_by = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=True)
    upload_date = db.Column(db.DateTime, default=datetime.utcnow)

    user = db.relationship('User', foreign_keys=[user_id], backref='audits')
    uploader = db.relationship('User', foreign_keys=[uploaded_by], backref='uploaded_audits')


class ScheduleShift(db.Model):
    __tablename__ = 'schedule_shifts'

    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    date = db.Column(db.Date, nullable=False, index=True)
    shift_type = db.Column(db.String(20), nullable=False, default='shift')
    time_from = db.Column(db.String(5), nullable=True)
    time_to = db.Column(db.String(5), nullable=True)
    hours = db.Column(db.Float, nullable=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    user = db.relationship('User', backref='schedule_shifts')

    __table_args__ = (
        db.UniqueConstraint('user_id', 'date', name='uq_user_date'),
    )