"""
SQLAlchemy ORM Models
Clean, focused data models for parking management
"""
from sqlalchemy import Column, String, Integer, Text, ForeignKey, Index
from sqlalchemy.orm import relationship, declarative_base

Base = declarative_base()


class User(Base):
    """Application users"""
    __tablename__ = "users"

    id = Column(Text, primary_key=True)
    email = Column(Text, unique=True, nullable=False)
    password_hash = Column(Text)
    name = Column(Text)
    role = Column(Text, nullable=False, default="employee")  # admin, manager, employee
    manager_id = Column(Text, ForeignKey("users.id"))  # Who manages this user (any user can have a manager)

    # Manager-specific fields (only relevant for role='manager')
    manager_parking_quota = Column(Integer, default=0)  # Number of spots this manager controls
    manager_spot_prefix = Column(Text)  # Letter prefix for spots: A, B, C, etc.

    # User preferences
    week_start_day = Column(Integer, default=0)  # 0=Sunday, 1=Monday, ..., 6=Saturday

    # Notification preferences
    notify_weekly_parking = Column(Integer, default=1)  # Weekly parking summary (Friday at 12)
    notify_daily_parking = Column(Integer, default=1)  # Daily parking reminder
    notify_daily_parking_hour = Column(Integer, default=8)  # Hour for daily reminder (0-23)
    notify_daily_parking_minute = Column(Integer, default=0)  # Minute for daily reminder (0-59)
    notify_parking_changes = Column(Integer, default=1)  # Immediate notification on assignment changes

    created_at = Column(Text)
    updated_at = Column(Text)

    # Relationships
    manager = relationship("User", remote_side=[id], backref="managed_users")
    presences = relationship("UserPresence", back_populates="user", cascade="all, delete-orphan")
    assignments = relationship("DailyParkingAssignment", back_populates="user", foreign_keys="DailyParkingAssignment.user_id")

    __table_args__ = (
        Index('idx_user_email', 'email'),
        Index('idx_user_manager', 'manager_id'),
    )


class UserPresence(Base):
    """Daily presence records"""
    __tablename__ = "user_presences"

    id = Column(Text, primary_key=True)
    user_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    date = Column(Text, nullable=False)  # YYYY-MM-DD
    status = Column(Text, nullable=False)  # present, remote, absent
    created_at = Column(Text)
    updated_at = Column(Text)

    # Relationships
    user = relationship("User", back_populates="presences")

    __table_args__ = (
        Index('idx_presence_user_date', 'user_id', 'date', unique=True),
        Index('idx_presence_date', 'date'),
    )


class DailyParkingAssignment(Base):
    """Parking spot assignments per day - spots belong to managers"""
    __tablename__ = "daily_parking_assignments"

    id = Column(Text, primary_key=True)
    date = Column(Text, nullable=False)  # YYYY-MM-DD
    spot_id = Column(Text, nullable=False)  # A1, A2, B1, B2, etc. (prefix from manager)
    user_id = Column(Text, ForeignKey("users.id", ondelete="SET NULL"))
    manager_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)  # Manager who owns the spot
    created_at = Column(Text)

    # Relationships
    user = relationship("User", back_populates="assignments", foreign_keys=[user_id])
    manager = relationship("User", foreign_keys=[manager_id])

    __table_args__ = (
        Index('idx_assignment_manager_date', 'manager_id', 'date'),
        Index('idx_assignment_user', 'user_id'),
        Index('idx_assignment_date_spot', 'date', 'spot_id'),
    )


class ManagerClosingDay(Base):
    """Specific date closing days for a manager's parking pool (holidays, special closures)"""
    __tablename__ = "manager_closing_days"

    id = Column(Text, primary_key=True)
    manager_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    date = Column(Text, nullable=False)  # YYYY-MM-DD
    reason = Column(Text)

    # Relationships
    manager = relationship("User")

    __table_args__ = (
        Index('idx_closing_manager_date', 'manager_id', 'date', unique=True),
    )


class ManagerWeeklyClosingDay(Base):
    """Weekly recurring closing days for a manager's parking pool (e.g., Saturday and Sunday)"""
    __tablename__ = "manager_weekly_closing_days"

    id = Column(Text, primary_key=True)
    manager_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    weekday = Column(Integer, nullable=False)  # 0=Sunday, 1=Monday, ..., 6=Saturday

    # Relationships
    manager = relationship("User")

    __table_args__ = (
        Index('idx_weekly_closing_manager_day', 'manager_id', 'weekday', unique=True),
    )


class ParkingGuarantee(Base):
    """Users guaranteed a parking spot when present (set by manager)"""
    __tablename__ = "parking_guarantees"

    id = Column(Text, primary_key=True)
    manager_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    user_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    start_date = Column(Text)  # Optional: YYYY-MM-DD (null = no start limit)
    end_date = Column(Text)    # Optional: YYYY-MM-DD (null = no end limit)
    created_at = Column(Text)

    # Relationships
    manager = relationship("User", foreign_keys=[manager_id])
    user = relationship("User", foreign_keys=[user_id])

    __table_args__ = (
        Index('idx_guarantee_manager_user', 'manager_id', 'user_id', unique=True),
    )


class ParkingExclusion(Base):
    """Users excluded from parking assignment (set by manager)"""
    __tablename__ = "parking_exclusions"

    id = Column(Text, primary_key=True)
    manager_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    user_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    start_date = Column(Text)  # Optional: YYYY-MM-DD (null = no start limit)
    end_date = Column(Text)    # Optional: YYYY-MM-DD (null = no end limit)
    created_at = Column(Text)

    # Relationships
    manager = relationship("User", foreign_keys=[manager_id])
    user = relationship("User", foreign_keys=[user_id])

    __table_args__ = (
        Index('idx_exclusion_manager_user', 'manager_id', 'user_id', unique=True),
    )


class NotificationLog(Base):
    """Log of sent notifications to prevent duplicates"""
    __tablename__ = "notification_logs"

    id = Column(Text, primary_key=True)
    user_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    notification_type = Column(Text, nullable=False)  # presence_reminder, weekly_parking, daily_parking, parking_change
    reference_date = Column(Text)  # The date/week this notification refers to (YYYY-MM-DD or YYYY-Www)
    sent_at = Column(Text, nullable=False)

    __table_args__ = (
        Index('idx_notification_user_type_date', 'user_id', 'notification_type', 'reference_date'),
    )


class NotificationQueue(Base):
    """Queue for pending notifications (for immediate parking change notifications)"""
    __tablename__ = "notification_queue"

    id = Column(Text, primary_key=True)
    user_id = Column(Text, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    notification_type = Column(Text, nullable=False)  # parking_change
    subject = Column(Text, nullable=False)
    body = Column(Text, nullable=False)
    created_at = Column(Text, nullable=False)
    sent_at = Column(Text)  # null = not sent yet

    __table_args__ = (
        Index('idx_queue_pending', 'sent_at'),
    )