import React, { useCallback, useEffect, useState } from 'react';
import { useHistory, useLocation, useParams } from 'react-router-dom';
import { Schedule } from '@/api/server/schedules/getServerSchedules';
import getServerSchedule from '@/api/server/schedules/getServerSchedule';
import Spinner from '@/components/elements/Spinner';
import FlashMessageRender from '@/components/FlashMessageRender';
import EditScheduleModal from '@/components/server/schedules/EditScheduleModal';
import NewTaskButton from '@/components/server/schedules/NewTaskButton';
import DeleteScheduleButton from '@/components/server/schedules/DeleteScheduleButton';
import Can from '@/components/elements/Can';
import useFlash from '@/plugins/useFlash';
import { ServerContext } from '@/state/server';
import PageContentBlock from '@/components/elements/PageContentBlock';
import tw from 'twin.macro';
import Button from '@/components/elements/Button';
import ScheduleTaskRow from '@/components/server/schedules/ScheduleTaskRow';
import isEqual from 'react-fast-compare';
import { format } from 'date-fns';
import ScheduleCronRow from '@/components/server/schedules/ScheduleCronRow';
import RunScheduleButton from '@/components/server/schedules/RunScheduleButton';

interface Params {
    id: string;
}

interface State {
    schedule?: Schedule;
}

const CronBox = ({ title, value }: { title: string; value: string }) => (
    <div css={tw`bg-neutral-700 rounded p-3`}>
        <p css={tw`text-neutral-300 text-sm`}>{title}</p>
        <p css={tw`text-xl font-medium text-neutral-100`}>{value}</p>
    </div>
);

const ActivePill = ({ active }: { active: boolean }) => (
    <span
        css={[
            tw`rounded-full px-2 py-px text-xs ml-4 uppercase`,
            active ? tw`bg-green-600 text-green-100` : tw`bg-red-600 text-red-100`,
        ]}
    >
        {active ? 'Active' : 'Inactive'}
    </span>
);

export default () => {
    const params = useParams() as Params;
    const history = useHistory();
    const state = useLocation<State>().state;

    const id = ServerContext.useStoreState(state => state.server.data!.id);
    const uuid = ServerContext.useStoreState(state => state.server.data!.uuid);

    const { clearFlashes, clearAndAddHttpError } = useFlash();
    const [ isLoading, setIsLoading ] = useState(true);
    const [ showEditModal, setShowEditModal ] = useState(false);

    const schedule = ServerContext.useStoreState(st => st.schedules.data.find(s => s.id === state.schedule?.id), isEqual);
    const appendSchedule = ServerContext.useStoreActions(actions => actions.schedules.appendSchedule);

    useEffect(() => {
        if (schedule?.id === Number(params.id)) {
            setIsLoading(false);
            return;
        }

        clearFlashes('schedules');
        getServerSchedule(uuid, Number(params.id))
            .then(schedule => appendSchedule(schedule))
            .catch(error => {
                console.error(error);
                clearAndAddHttpError({ error, key: 'schedules' });
            })
            .then(() => setIsLoading(false));
    }, [ params ]);

    const toggleEditModal = useCallback(() => {
        setShowEditModal(s => !s);
    }, []);

    return (
        <PageContentBlock>
            <FlashMessageRender byKey={'schedules'} css={tw`mb-4`}/>
            {!schedule || isLoading ?
                <Spinner size={'large'} centered/>
                :
                <>
                    <ScheduleCronRow cron={schedule.cron} css={tw`sm:hidden bg-neutral-700 rounded mb-4 p-3`}/>
                    <div css={tw`rounded shadow`}>
                        <div css={tw`sm:flex items-center bg-neutral-900 p-3 sm:p-6 border-b-4 border-neutral-600 rounded-t`}>
                            <div css={tw`flex-1`}>
                                <h3 css={tw`flex items-center text-neutral-100 text-2xl`}>
                                    {schedule.name}
                                    {schedule.isProcessing ?
                                        <span
                                            css={tw`flex items-center rounded-full px-2 py-px text-xs ml-4 uppercase bg-neutral-600 text-white`}
                                        >
                                            <Spinner css={tw`w-3! h-3! mr-2`}/>
                                            Processing
                                        </span>
                                        :
                                        <ActivePill active={schedule.isActive}/>
                                    }
                                </h3>
                                <p css={tw`mt-1 text-sm text-neutral-200`}>
                                    Last run at:&nbsp;
                                    {schedule.lastRunAt ?
                                        format(schedule.lastRunAt, 'MMM do \'at\' h:mma')
                                        :
                                        <span css={tw`text-neutral-300`}>n/a</span>
                                    }
                                    <span css={tw`ml-4 pl-4 border-l-4 border-neutral-600 py-px`}>
                                        Next run at:&nbsp;
                                        {schedule.nextRunAt ?
                                            format(schedule.nextRunAt, 'MMM do \'at\' h:mma')
                                            :
                                            <span css={tw`text-neutral-300`}>n/a</span>
                                        }
                                    </span>
                                </p>
                            </div>
                            <div css={tw`flex sm:block mt-3 sm:mt-0`}>
                                <Can action={'schedule.update'}>
                                    <Button
                                        isSecondary
                                        color={'grey'}
                                        size={'small'}
                                        css={tw`flex-1 mr-4 border-transparent`}
                                        onClick={toggleEditModal}
                                    >
                                        Edit
                                    </Button>
                                    <NewTaskButton schedule={schedule}/>
                                </Can>
                            </div>
                        </div>
                        <div css={tw`hidden sm:grid grid-cols-5 md:grid-cols-5 gap-4 mb-4 mt-4`}>
                            <CronBox title={'Minute'} value={schedule.cron.minute}/>
                            <CronBox title={'Hour'} value={schedule.cron.hour}/>
                            <CronBox title={'Day (Month)'} value={schedule.cron.dayOfMonth}/>
                            <CronBox title={'Month'} value={schedule.cron.month}/>
                            <CronBox title={'Day (Week)'} value={schedule.cron.dayOfWeek}/>
                        </div>
                        <div css={tw`bg-neutral-700 rounded-b`}>
                            {schedule.tasks.length > 0 ?
                                schedule.tasks.map(task => (
                                    <ScheduleTaskRow key={`${schedule.id}_${task.id}`} task={task} schedule={schedule}/>
                                ))
                                :
                                null
                            }
                        </div>
                    </div>
                    <EditScheduleModal visible={showEditModal} schedule={schedule} onDismissed={toggleEditModal}/>
                    <div css={tw`mt-6 flex sm:justify-end`}>
                        <Can action={'schedule.delete'}>
                            <DeleteScheduleButton
                                scheduleId={schedule.id}
                                onDeleted={() => history.push(`/server/${id}/schedules`)}
                            />
                        </Can>
                        {schedule.isActive && schedule.tasks.length > 0 &&
                        <Can action={'schedule.update'}>
                            <RunScheduleButton schedule={schedule}/>
                        </Can>
                        }
                    </div>
                </>
            }
        </PageContentBlock>
    );
};
