from datetime import date, time

from pydantic import BaseModel, field_validator


class TimeSlot(BaseModel):
    """A single time slot (start and end time)."""

    start_time: time
    end_time: time

    @field_validator("start_time", "end_time")
    @classmethod
    def validate_15min_boundary(cls, v: time) -> time:
        """Ensure times are on 15-minute boundaries."""
        if v.minute not in (0, 15, 30, 45):
            raise ValueError("Time must be on 15-minute boundary (:00, :15, :30, :45)")
        if v.second != 0 or v.microsecond != 0:
            raise ValueError("Time must not have seconds or microseconds")
        return v


class AvailabilityDay(BaseModel):
    """Availability for a single day."""

    date: date
    slots: list[TimeSlot]


class AvailabilityResponse(BaseModel):
    """Response model for availability query."""

    days: list[AvailabilityDay]


class SetAvailabilityRequest(BaseModel):
    """Request to set availability for a specific date."""

    date: date
    slots: list[TimeSlot]


class CopyAvailabilityRequest(BaseModel):
    """Request to copy availability from one day to others."""

    source_date: date
    target_dates: list[date]