src/meeting_scheduling/json_serialization.py

from solverforge_legacy.solver.score import HardMediumSoftScore
from pydantic import (
    BaseModel,
    ConfigDict,
    PlainSerializer,
    BeforeValidator,
    ValidationInfo,
)
from pydantic.alias_generators import to_camel
from typing import Any


def make_list_item_validator(key: str):
    def validator(v: Any, info: ValidationInfo) -> Any:
        if v is None:
            return None

        if not isinstance(v, str) or not info.context:
            return v

        return info.context.get(key, {}).get(v, v)

    return BeforeValidator(validator)


# Validators for foreign key references
MeetingDeserializer = make_list_item_validator("meetings")
RoomDeserializer = make_list_item_validator("rooms")
TimeGrainDeserializer = make_list_item_validator("timeGrains")

IdSerializer = PlainSerializer(
    lambda item: item.id if item is not None else None, return_type=str | None
)
ScoreSerializer = PlainSerializer(
    lambda score: str(score) if score is not None else None, return_type=str | None
)


def validate_score(v: Any, info: ValidationInfo) -> Any:
    if isinstance(v, HardMediumSoftScore) or v is None:
        return v
    if isinstance(v, str):
        return HardMediumSoftScore.parse(v)
    raise ValueError('"score" should be a string')


ScoreValidator = BeforeValidator(validate_score)


class JsonDomainBase(BaseModel):
    model_config = ConfigDict(
        alias_generator=to_camel,
        populate_by_name=True,
        from_attributes=True,
    )