from sqlalchemy import Column, String, DateTime, Boolean, Text, Date, Integer
from datetime import datetime
from backend.database import Base


class Emitter(Base):
    __tablename__ = "emitters"

    id = Column(String, primary_key=True, index=True)
    unit_type = Column(String, nullable=False)
    last_seen = Column(DateTime, default=datetime.utcnow)
    last_file = Column(String, nullable=False)
    status = Column(String, nullable=False)
    notes = Column(String, nullable=True)


class RosterUnit(Base):
    """
    Roster table: represents our *intended assignment* of a unit.
    This is editable from the GUI.

    Supports multiple device types (seismograph, modem) with type-specific fields.
    """
    __tablename__ = "roster"

    # Core fields (all device types)
    id = Column(String, primary_key=True, index=True)
    unit_type = Column(String, default="series3")  # Backward compatibility
    device_type = Column(String, default="seismograph")  # "seismograph" | "modem"
    deployed = Column(Boolean, default=True)
    retired = Column(Boolean, default=False)
    note = Column(String, nullable=True)
    project_id = Column(String, nullable=True)
    location = Column(String, nullable=True)  # Legacy field - use address/coordinates instead
    address = Column(String, nullable=True)  # Human-readable address
    coordinates = Column(String, nullable=True)  # Lat,Lon format: "34.0522,-118.2437"
    last_updated = Column(DateTime, default=datetime.utcnow)

    # Seismograph-specific fields (nullable for modems)
    last_calibrated = Column(Date, nullable=True)
    next_calibration_due = Column(Date, nullable=True)
    deployed_with_modem_id = Column(String, nullable=True)  # FK to another RosterUnit

    # Modem-specific fields (nullable for seismographs)
    ip_address = Column(String, nullable=True)
    phone_number = Column(String, nullable=True)
    hardware_model = Column(String, nullable=True)


class IgnoredUnit(Base):
    """
    Ignored units: units that report but should be filtered out from unknown emitters.
    Used to suppress noise from old projects.
    """
    __tablename__ = "ignored_units"

    id = Column(String, primary_key=True, index=True)
    reason = Column(String, nullable=True)
    ignored_at = Column(DateTime, default=datetime.utcnow)


class UnitHistory(Base):
    """
    Unit history: complete timeline of changes to each unit.
    Tracks note changes, status changes, deployment/benched events, and more.
    """
    __tablename__ = "unit_history"

    id = Column(Integer, primary_key=True, autoincrement=True)
    unit_id = Column(String, nullable=False, index=True)  # FK to RosterUnit.id
    change_type = Column(String, nullable=False)  # note_change, deployed_change, retired_change, etc.
    field_name = Column(String, nullable=True)  # Which field changed
    old_value = Column(Text, nullable=True)  # Previous value
    new_value = Column(Text, nullable=True)  # New value
    changed_at = Column(DateTime, default=datetime.utcnow, nullable=False, index=True)
    source = Column(String, default="manual")  # manual, csv_import, telemetry, offline_sync
    notes = Column(Text, nullable=True)  # Optional reason/context for the change


class UserPreferences(Base):
    """
    User preferences: persistent storage for application settings.
    Single-row table (id=1) to store global user preferences.
    """
    __tablename__ = "user_preferences"

    id = Column(Integer, primary_key=True, default=1)
    timezone = Column(String, default="America/New_York")
    theme = Column(String, default="auto")  # auto, light, dark
    auto_refresh_interval = Column(Integer, default=10)  # seconds
    date_format = Column(String, default="MM/DD/YYYY")
    table_rows_per_page = Column(Integer, default=25)
    calibration_interval_days = Column(Integer, default=365)
    calibration_warning_days = Column(Integer, default=30)
    status_ok_threshold_hours = Column(Integer, default=12)
    status_pending_threshold_hours = Column(Integer, default=24)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)