"""MinimumWorkload model — per-user workload threshold configuration.

Stores the minimum expected workload (in minutes) across four periods
(daily / weekly / monthly / yearly) and three slot categories
(work / on_call / entertainment).  Values are advisory: when a
calendar submission would leave the user below these thresholds, the
system returns a *warning* but does not block the operation.

Storage decision (BE-CAL-004): independent table with a JSON column.
This keeps the User model clean while giving each user exactly one
configuration row.  The JSON structure matches the design document:

    {
      "daily":   {"work": 0, "on_call": 0, "entertainment": 0},
      "weekly":  {"work": 0, "on_call": 0, "entertainment": 0},
      "monthly": {"work": 0, "on_call": 0, "entertainment": 0},
      "yearly":  {"work": 0, "on_call": 0, "entertainment": 0}
    }

All values are minutes in range [0, 65535].
"""

from sqlalchemy import Column, Integer, ForeignKey, JSON, DateTime
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func

from app.core.config import Base


# Default configuration — all thresholds zeroed out (no warnings).
DEFAULT_WORKLOAD_CONFIG: dict = {
    "daily":   {"work": 0, "on_call": 0, "entertainment": 0},
    "weekly":  {"work": 0, "on_call": 0, "entertainment": 0},
    "monthly": {"work": 0, "on_call": 0, "entertainment": 0},
    "yearly":  {"work": 0, "on_call": 0, "entertainment": 0},
}

PERIODS = ("daily", "weekly", "monthly", "yearly")
CATEGORIES = ("work", "on_call", "entertainment")


class MinimumWorkload(Base):
    """Per-user minimum workload configuration."""

    __tablename__ = "minimum_workloads"

    id = Column(Integer, primary_key=True, index=True)

    user_id = Column(
        Integer,
        ForeignKey("users.id"),
        nullable=False,
        unique=True,
        index=True,
        comment="One config row per user",
    )

    config = Column(
        JSON,
        nullable=False,
        default=lambda: dict(DEFAULT_WORKLOAD_CONFIG),
        comment="Workload thresholds JSON — see module docstring for schema",
    )

    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())