import { useTheme } from '@emotion/react';
import styled from '@emotion/styled';

import { useOpenCreateActivityDrawer } from '@/activities/hooks/useOpenCreateActivityDrawer';
import { TasksRecoilScopeContext } from '@/activities/states/recoil-scope-contexts/TasksRecoilScopeContext';
import { useTasks } from '@/activities/tasks/hooks/useTasks';
import { ActivityTargetableEntity } from '@/activities/types/ActivityTargetableEntity';
import { Button } from '@/ui/button/components/Button';
import { IconCheckbox } from '@/ui/icon';
import { activeTabIdScopedState } from '@/ui/tab/states/activeTabIdScopedState';
import { useRecoilScopedState } from '@/ui/utilities/recoil-scope/hooks/useRecoilScopedState';
import { ActivityType } from '~/generated/graphql';

import { AddTaskButton } from './AddTaskButton';
import { TaskList } from './TaskList';

type OwnProps = {
  entity?: ActivityTargetableEntity;
  showAddButton?: boolean;
};

const StyledTaskGroupEmptyContainer = styled.div`
  align-items: center;
  align-self: stretch;
  display: flex;
  flex: 1 0 0;
  flex-direction: column;
  gap: ${({ theme }) => theme.spacing(2)};
  justify-content: center;
  padding-bottom: ${({ theme }) => theme.spacing(16)};
  padding-left: ${({ theme }) => theme.spacing(4)};
  padding-right: ${({ theme }) => theme.spacing(4)};
  padding-top: ${({ theme }) => theme.spacing(3)};
`;

const StyledEmptyTaskGroupTitle = styled.div`
  color: ${({ theme }) => theme.font.color.secondary};
  font-size: ${({ theme }) => theme.font.size.xxl};
  font-weight: ${({ theme }) => theme.font.weight.semiBold};
  line-height: ${({ theme }) => theme.text.lineHeight.md};
`;

const StyledEmptyTaskGroupSubTitle = styled.div`
  color: ${({ theme }) => theme.font.color.extraLight};
  font-size: ${({ theme }) => theme.font.size.xxl};
  font-weight: ${({ theme }) => theme.font.weight.semiBold};
  line-height: ${({ theme }) => theme.text.lineHeight.md};
  margin-bottom: ${({ theme }) => theme.spacing(2)};
`;

const StyledContainer = styled.div`
  display: flex;
  flex-direction: column;
`;

export function TaskGroups({ entity, showAddButton }: OwnProps) {
  const {
    todayOrPreviousTasks,
    upcomingTasks,
    unscheduledTasks,
    completedTasks,
  } = useTasks(entity);
  const theme = useTheme();

  const openCreateActivity = useOpenCreateActivityDrawer();

  const [activeTabId] = useRecoilScopedState(
    activeTabIdScopedState,
    TasksRecoilScopeContext,
  );

  if (
    (activeTabId === 'to-do' &&
      todayOrPreviousTasks?.length === 0 &&
      upcomingTasks?.length === 0 &&
      unscheduledTasks?.length === 0) ||
    (activeTabId === 'done' && completedTasks?.length === 0)
  ) {
    return (
      <StyledTaskGroupEmptyContainer>
        <StyledEmptyTaskGroupTitle>No task yet</StyledEmptyTaskGroupTitle>
        <StyledEmptyTaskGroupSubTitle>Create one:</StyledEmptyTaskGroupSubTitle>
        <Button
          icon={<IconCheckbox size={theme.icon.size.sm} />}
          title="New task"
          variant={'secondary'}
          onClick={() =>
            openCreateActivity(ActivityType.Task, entity ? [entity] : undefined)
          }
        />
      </StyledTaskGroupEmptyContainer>
    );
  }

  return (
    <StyledContainer>
      {activeTabId === 'done' ? (
        <TaskList
          tasks={completedTasks ?? []}
          button={showAddButton && <AddTaskButton entity={entity} />}
        />
      ) : (
        <>
          <TaskList
            title="Today"
            tasks={todayOrPreviousTasks ?? []}
            button={showAddButton && <AddTaskButton entity={entity} />}
          />
          <TaskList
            title="Upcoming"
            tasks={upcomingTasks ?? []}
            button={
              showAddButton &&
              !todayOrPreviousTasks?.length && <AddTaskButton entity={entity} />
            }
          />
          <TaskList
            title="Unscheduled"
            tasks={unscheduledTasks ?? []}
            button={
              showAddButton &&
              !todayOrPreviousTasks?.length &&
              !upcomingTasks?.length && <AddTaskButton entity={entity} />
            }
          />
        </>
      )}
    </StyledContainer>
  );
}
