from __future__ import annotations

from datetime import date, datetime

from sqlalchemy import Boolean, Date, DateTime, Float, ForeignKey, Index, Integer, String, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db import Base


class Device(Base):
    __tablename__ = "devices"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    device_type: Mapped[str] = mapped_column(String(64), nullable=False)
    enable_cloud_service: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    hub_device_id: Mapped[str | None] = mapped_column(String(64))
    last_seen_at: Mapped[datetime | None] = mapped_column(DateTime)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    readings: Mapped[list["Reading"]] = relationship(back_populates="device")
    scheduled_reports: Mapped[list["ScheduledReport"]] = relationship(back_populates="device")


class Reading(Base):
    __tablename__ = "readings"
    __table_args__ = (
        Index("ix_readings_device_recorded", "device_id", "recorded_at"),
        Index("ix_readings_recorded", "recorded_at"),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    device_id: Mapped[str] = mapped_column(ForeignKey("devices.id"), nullable=False)
    recorded_at: Mapped[datetime] = mapped_column(DateTime, nullable=False)
    temperature: Mapped[float | None] = mapped_column(Float)
    humidity: Mapped[float | None] = mapped_column(Float)
    battery: Mapped[int | None] = mapped_column(Integer)
    version: Mapped[str | None] = mapped_column(String(32))

    device: Mapped[Device] = relationship(back_populates="readings")


class ReportRecipient(Base):
    __tablename__ = "report_recipients"
    __table_args__ = (UniqueConstraint("email", name="uq_report_recipients_email"),)

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    email: Mapped[str] = mapped_column(String(255), nullable=False)
    name: Mapped[str | None] = mapped_column(String(255))
    active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    scheduled_reports: Mapped[list["ScheduledReport"]] = relationship(back_populates="recipient")


class ScheduledReport(Base):
    __tablename__ = "scheduled_reports"
    __table_args__ = (
        Index("ix_scheduled_reports_active_cadence", "active", "cadence"),
        UniqueConstraint(
            "recipient_id",
            "cadence",
            "send_time",
            "weekday",
            "monthday",
            "device_id",
            name="uq_scheduled_report_config",
        ),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    recipient_id: Mapped[int] = mapped_column(ForeignKey("report_recipients.id"), nullable=False)
    cadence: Mapped[str] = mapped_column(String(16), nullable=False)
    send_time: Mapped[str] = mapped_column(String(5), nullable=False, default="08:00")
    weekday: Mapped[int | None] = mapped_column(Integer)
    monthday: Mapped[int | None] = mapped_column(Integer)
    device_id: Mapped[str | None] = mapped_column(ForeignKey("devices.id"))
    active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )

    recipient: Mapped[ReportRecipient] = relationship(back_populates="scheduled_reports")
    device: Mapped[Device | None] = relationship(back_populates="scheduled_reports")
    runs: Mapped[list["ScheduledReportRun"]] = relationship(back_populates="scheduled_report")


class ScheduledReportRun(Base):
    __tablename__ = "scheduled_report_runs"
    __table_args__ = (
        UniqueConstraint(
            "scheduled_report_id",
            "period_start",
            "period_end",
            name="uq_scheduled_report_run_period",
        ),
        Index("ix_scheduled_report_runs_status", "status"),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    scheduled_report_id: Mapped[int] = mapped_column(ForeignKey("scheduled_reports.id"), nullable=False)
    period_start: Mapped[date] = mapped_column(Date, nullable=False)
    period_end: Mapped[date] = mapped_column(Date, nullable=False)
    status: Mapped[str] = mapped_column(String(16), nullable=False, default="pending")
    pdf_path: Mapped[str | None] = mapped_column(String(1024))
    error: Mapped[str | None] = mapped_column(String(1024))
    created_at: Mapped[datetime] = mapped_column(DateTime, server_default=func.now(), nullable=False)
    sent_at: Mapped[datetime | None] = mapped_column(DateTime)

    scheduled_report: Mapped[ScheduledReport] = relationship(back_populates="runs")