import { DateTime } from 'luxon';

import { Activity } from '@/activities/types/Activity';
import { ActivityTargetableEntity } from '@/activities/types/ActivityTargetableEntity';
import { useOptimisticEffect } from '@/apollo/optimistic-effect/hooks/useOptimisticEffect';
import { useObjectMetadataItem } from '@/object-metadata/hooks/useObjectMetadataItem';
import { getRecordOptimisticEffectDefinition } from '@/object-record/graphql/optimistic-effect-definition/getRecordOptimisticEffectDefinition';
import { useFindManyObjectRecords } from '@/object-record/hooks/useFindManyObjectRecords';
import { useFilter } from '@/ui/object/object-filter-dropdown/hooks/useFilter';
import { parseDate } from '~/utils/date-utils';

export const useTasks = (entity?: ActivityTargetableEntity) => {
  const { selectedFilter } = useFilter();

  const { objects: activityTargets } = useFindManyObjectRecords({
    objectNamePlural: 'activityTargets',
    filter: {
      [entity?.type === 'Company' ? 'companyId' : 'personId']: {
        eq: entity?.id,
      },
    },
  });

  const { objectMetadataItem: activityObjectMetadataItem } =
    useObjectMetadataItem({
      objectNameSingular: 'activity',
    });

  const { registerOptimisticEffect } = useOptimisticEffect({
    objectNameSingular: activityObjectMetadataItem?.nameSingular,
  });

  const { objects: completeTasksData } = useFindManyObjectRecords({
    objectNamePlural: 'activities',
    skip: !entity && !selectedFilter,
    filter: {
      completedAt: { is: 'NOT_NULL' },
      id: {
        in: activityTargets?.map((activityTarget) => activityTarget.activityId),
      },
      type: { eq: 'Task' },
    },
    orderBy: {
      createdAt: 'DescNullsFirst',
    },
    onCompleted: () => {
      if (activityObjectMetadataItem) {
        registerOptimisticEffect({
          variables: {
            filter: {
              completedAt: { is: 'NOT_NULL' },
              id: {
                in: activityTargets?.map(
                  (activityTarget) => activityTarget.activityId,
                ),
              },
              type: { eq: 'Task' },
            },
            orderBy: {
              createdAt: 'DescNullsFirst',
            },
          },
          definition: getRecordOptimisticEffectDefinition({
            objectMetadataItem: activityObjectMetadataItem,
          }),
        });
      }
    },
  });

  const { objects: incompleteTaskData } = useFindManyObjectRecords({
    objectNamePlural: 'activities',
    skip: !entity && !selectedFilter,
    filter: {
      completedAt: { is: 'NULL' },
      id: {
        in: activityTargets?.map((activityTarget) => activityTarget.activityId),
      },
      type: { eq: 'Task' },
    },
    orderBy: {
      createdAt: 'DescNullsFirst',
    },
    onCompleted: () => {
      if (activityObjectMetadataItem) {
        registerOptimisticEffect({
          variables: {
            filter: {
              completedAt: { is: 'NULL' },
              id: {
                in: activityTargets?.map(
                  (activityTarget) => activityTarget.activityId,
                ),
              },
              type: { eq: 'Task' },
            },
            orderBy: {
              createdAt: 'DescNullsFirst',
            },
          },
          definition: getRecordOptimisticEffectDefinition({
            objectMetadataItem: activityObjectMetadataItem,
          }),
        });
      }
    },
  });

  const todayOrPreviousTasks = incompleteTaskData?.filter((task) => {
    if (!task.dueAt) {
      return false;
    }
    const dueDate = parseDate(task.dueAt).toJSDate();
    const today = DateTime.now().endOf('day').toJSDate();
    return dueDate <= today;
  });

  const upcomingTasks = incompleteTaskData?.filter((task) => {
    if (!task.dueAt) {
      return false;
    }
    const dueDate = parseDate(task.dueAt).toJSDate();
    const today = DateTime.now().endOf('day').toJSDate();
    return dueDate > today;
  });

  const unscheduledTasks = incompleteTaskData?.filter((task) => {
    return !task.dueAt;
  });

  const completedTasks = completeTasksData;

  return {
    todayOrPreviousTasks: (todayOrPreviousTasks ?? []) as Activity[],
    upcomingTasks: (upcomingTasks ?? []) as Activity[],
    unscheduledTasks: (unscheduledTasks ?? []) as Activity[],
    completedTasks: (completedTasks ?? []) as Activity[],
  };
};