"""
Schemas for sorting Orion API objects.
"""

from typing import TYPE_CHECKING

from prefect.utilities.collections import AutoEnum

if TYPE_CHECKING:
    from sqlalchemy.sql.expression import ColumnElement

    from prefect.orion.database.interface import OrionDBInterface

# TOOD: Consider moving the `as_sql_sort` functions out of here since they are a
#       database model level function and do not properly separate concerns when
#       present in the schemas module


class FlowRunSort(AutoEnum):
    """Defines flow run sorting options."""

    ID_DESC = AutoEnum.auto()
    START_TIME_ASC = AutoEnum.auto()
    START_TIME_DESC = AutoEnum.auto()
    EXPECTED_START_TIME_ASC = AutoEnum.auto()
    EXPECTED_START_TIME_DESC = AutoEnum.auto()
    NAME_ASC = AutoEnum.auto()
    NAME_DESC = AutoEnum.auto()
    NEXT_SCHEDULED_START_TIME_ASC = AutoEnum.auto()
    END_TIME_DESC = AutoEnum.auto()

    def as_sql_sort(self, db: "OrionDBInterface") -> "ColumnElement":
        from sqlalchemy.sql.functions import coalesce

        """Return an expression used to sort flow runs"""
        sort_mapping = {
            "ID_DESC": db.FlowRun.id.desc(),
            "START_TIME_ASC": coalesce(
                db.FlowRun.start_time, db.FlowRun.expected_start_time
            ).asc(),
            "START_TIME_DESC": coalesce(
                db.FlowRun.start_time, db.FlowRun.expected_start_time
            ).desc(),
            "EXPECTED_START_TIME_ASC": db.FlowRun.expected_start_time.asc(),
            "EXPECTED_START_TIME_DESC": db.FlowRun.expected_start_time.desc(),
            "NAME_ASC": db.FlowRun.name.asc(),
            "NAME_DESC": db.FlowRun.name.desc(),
            "NEXT_SCHEDULED_START_TIME_ASC": db.FlowRun.next_scheduled_start_time.asc(),
            "END_TIME_DESC": db.FlowRun.end_time.desc(),
        }
        return sort_mapping[self.value]


class TaskRunSort(AutoEnum):
    """Defines task run sorting options."""

    ID_DESC = AutoEnum.auto()
    EXPECTED_START_TIME_ASC = AutoEnum.auto()
    EXPECTED_START_TIME_DESC = AutoEnum.auto()
    NAME_ASC = AutoEnum.auto()
    NAME_DESC = AutoEnum.auto()
    NEXT_SCHEDULED_START_TIME_ASC = AutoEnum.auto()
    END_TIME_DESC = AutoEnum.auto()

    def as_sql_sort(self, db: "OrionDBInterface") -> "ColumnElement":
        """Return an expression used to sort task runs"""
        sort_mapping = {
            "ID_DESC": db.TaskRun.id.desc(),
            "EXPECTED_START_TIME_ASC": db.TaskRun.expected_start_time.asc(),
            "EXPECTED_START_TIME_DESC": db.TaskRun.expected_start_time.desc(),
            "NAME_ASC": db.TaskRun.name.asc(),
            "NAME_DESC": db.TaskRun.name.desc(),
            "NEXT_SCHEDULED_START_TIME_ASC": db.TaskRun.next_scheduled_start_time.asc(),
            "END_TIME_DESC": db.TaskRun.end_time.desc(),
        }
        return sort_mapping[self.value]


class LogSort(AutoEnum):
    """Defines log sorting options."""

    TIMESTAMP_ASC = AutoEnum.auto()
    TIMESTAMP_DESC = AutoEnum.auto()
    LEVEL_ASC = AutoEnum.auto()
    LEVEL_DESC = AutoEnum.auto()
    FLOW_RUN_ID_ASC = AutoEnum.auto()
    FLOW_RUN_ID_DESC = AutoEnum.auto()
    TASK_RUN_ID_ASC = AutoEnum.auto()
    TASK_RUN_ID_DESC = AutoEnum.auto()

    def as_sql_sort(self, db: "OrionDBInterface") -> "ColumnElement":
        """Return an expression used to sort task runs"""
        sort_mapping = {
            "TIMESTAMP_ASC": db.Log.timestamp.asc(),
            "TIMESTAMP_DESC": db.Log.timestamp.desc(),
            "LEVEL_ASC": db.Log.level.asc(),
            "LEVEL_DESC": db.Log.level.desc(),
            "FLOW_RUN_ID_ASC": db.Log.flow_run_id.asc(),
            "FLOW_RUN_ID_DESC": db.Log.flow_run_id.desc(),
            "TASK_RUN_ID_ASC": db.Log.task_run_id.asc(),
            "TASK_RUN_ID_DESC": db.Log.task_run_id.desc(),
        }
        return sort_mapping[self.value]


class FlowSort(AutoEnum):
    """Defines flow sorting options."""

    CREATED_DESC = AutoEnum.auto()
    UPDATED_DESC = AutoEnum.auto()
    NAME_ASC = AutoEnum.auto()
    NAME_DESC = AutoEnum.auto()

    def as_sql_sort(self, db: "OrionDBInterface") -> "ColumnElement":
        """Return an expression used to sort flows"""
        sort_mapping = {
            "CREATED_DESC": db.Flow.created.desc(),
            "UPDATED_DESC": db.Flow.updated.desc(),
            "NAME_ASC": db.Flow.name.asc(),
            "NAME_DESC": db.Flow.name.desc(),
        }
        return sort_mapping[self.value]


class DeploymentSort(AutoEnum):
    """Defines deployment sorting options."""

    CREATED_DESC = AutoEnum.auto()
    UPDATED_DESC = AutoEnum.auto()
    NAME_ASC = AutoEnum.auto()
    NAME_DESC = AutoEnum.auto()

    def as_sql_sort(self, db: "OrionDBInterface") -> "ColumnElement":
        """Return an expression used to sort deployments"""
        sort_mapping = {
            "CREATED_DESC": db.Deployment.created.desc(),
            "UPDATED_DESC": db.Deployment.updated.desc(),
            "NAME_ASC": db.Deployment.name.asc(),
            "NAME_DESC": db.Deployment.name.desc(),
        }
        return sort_mapping[self.value]