/*
 * Copyright (C) Contributors to the Suwayomi project
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

import { Chip, Tab, Tabs, styled, Box } from '@mui/material';
import React, { useContext, useEffect, useMemo } from 'react';
import { useQueryParam, NumberParam } from 'use-query-params';
import { useTranslation } from 'react-i18next';
import requestManager from '@/lib/requests/RequestManager.ts';
import NavbarContext from '@/components/context/NavbarContext';
import EmptyView from '@/components/util/EmptyView';
import LoadingPlaceholder from '@/components/util/LoadingPlaceholder';
import TabPanel from '@/components/util/TabPanel';
import LibraryToolbarMenu from '@/components/library/LibraryToolbarMenu';
import LibraryMangaGrid from '@/components/library/LibraryMangaGrid';
import AppbarSearch from '@/components/util/AppbarSearch';
import UpdateChecker from '@/components/library/UpdateChecker';
import { useLibraryOptionsContext } from '@/components/context/LibraryOptionsContext';

const StyledGridWrapper = styled(Box)(({ theme }) => ({
    // TabsMenu height + TabsMenu bottom padding - grid item top padding
    marginTop: `calc(48px + 13px - 8px)`,
    // header height - TabsMenu height - TabsMenu bottom padding + grid item top padding
    minHeight: 'calc(100vh - 64px - 48px - 13px + 8px)',
    position: 'relative',
    [theme.breakpoints.down('sm')]: {
        // TabsMenu - 8px margin diff header height (56px) + TabsMenu bottom padding - grid item top padding
        marginTop: `calc(48px - 8px + 13px - 8px)`,
        // header height (+ 8px margin) - footer height - TabsMenu height
        minHeight: 'calc(100vh - 64px - 64px - 48px)',
    },
}));

const TabsMenu = styled(Tabs)(({ theme }) => ({
    display: 'flex',
    position: 'fixed',
    top: '64px',
    width: 'calc(100% - 64px)',
    zIndex: 1,
    backgroundColor: theme.palette.background.default,
    paddingBottom: '13px',
    [theme.breakpoints.down('sm')]: {
        top: '56px', // header height
        width: '100%',
    },
}));

const TitleWithSizeTag = styled('span')({
    display: 'flex',
    alignItems: 'center',
});

const TitleSizeTag = (props: React.ComponentProps<typeof Chip>) => (
    <Chip {...props} size="small" sx={{ marginLeft: '5px' }} />
);

export default function Library() {
    const { t } = useTranslation();

    const { options } = useLibraryOptionsContext();
    const {
        data: categoriesResponse,
        error: tabsError,
        loading: areCategoriesLoading,
    } = requestManager.useGetCategories();
    const tabsData = categoriesResponse?.categories.nodes.filter(
        (category) => category.id !== 0 || (category.id === 0 && category.mangas.totalCount),
    );
    const tabs = tabsData ?? [];
    const librarySize = useMemo(
        () => tabs.map((tab) => tab.mangas.totalCount).reduce((prev, curr) => prev + curr, 0),
        [tabs],
    );

    const [tabSearchParam, setTabSearchParam] = useQueryParam('tab', NumberParam);

    const activeTab = tabs.find((tab) => tab.order === tabSearchParam) ?? tabs[0];
    const {
        data: categoryMangaResponse,
        error: mangaError,
        loading: mangaLoading,
    } = requestManager.useGetCategoryMangas(activeTab?.id, { skip: !activeTab, nextFetchPolicy: 'cache-only' });
    const mangas = categoryMangaResponse?.category.mangas.nodes ?? [];

    const { setTitle, setAction } = useContext(NavbarContext);
    useEffect(() => {
        const title = t('library.title');
        const navBarTitle = (
            <TitleWithSizeTag>
                {title}
                {areCategoriesLoading || !options.showTabSize ? null : <TitleSizeTag label={librarySize} />}
            </TitleWithSizeTag>
        );
        setTitle(navBarTitle, title);
        setAction(
            <>
                <AppbarSearch />
                <LibraryToolbarMenu />
                <UpdateChecker />
            </>,
        );
        return () => {
            setTitle('');
            setAction(null);
        };
    }, [t, librarySize, areCategoriesLoading, options]);

    const handleTabChange = (newTab: number) => {
        setTabSearchParam(newTab);
    };

    if (tabsError != null) {
        return (
            <EmptyView
                message={t('category.error.label.request_failure')}
                messageExtra={tabsError.message ?? tabsError}
            />
        );
    }

    if (areCategoriesLoading) {
        return <LoadingPlaceholder />;
    }

    if (tabs.length === 0) {
        return <EmptyView message={t('library.error.label.empty')} />;
    }

    if (tabs.length === 1) {
        return (
            <LibraryMangaGrid
                mangas={mangas}
                message={t('library.error.label.empty')}
                isLoading={activeTab != null && mangaLoading}
            />
        );
    }

    // Visual Hack: 160px is min-width for viewport width of >600
    const scrollableTabs = window.innerWidth < tabs.length * 160;

    return (
        <StyledGridWrapper>
            <TabsMenu
                value={activeTab.order}
                onChange={(e, newTab) => handleTabChange(newTab)}
                indicatorColor="primary"
                textColor="primary"
                centered={!scrollableTabs}
                variant={scrollableTabs ? 'scrollable' : 'fullWidth'}
                scrollButtons
                allowScrollButtonsMobile
            >
                {tabs.map((tab) => (
                    <Tab
                        sx={{ display: 'flex' }}
                        key={tab.id}
                        label={
                            <TitleWithSizeTag>
                                {tab.name}
                                {options.showTabSize ? <TitleSizeTag label={tab.mangas.totalCount} /> : null}
                            </TitleWithSizeTag>
                        }
                        value={tab.order}
                    />
                ))}
            </TabsMenu>
            {tabs.map((tab) => (
                <TabPanel key={tab.order} index={tab.order} currentIndex={activeTab.order}>
                    {tab === activeTab &&
                        (mangaError ? (
                            <EmptyView
                                message={t('manga.error.label.request_failure')}
                                messageExtra={mangaError.message ?? mangaError}
                            />
                        ) : (
                            <LibraryMangaGrid
                                mangas={mangas}
                                message={t('library.error.label.empty')}
                                isLoading={mangaLoading}
                            />
                        ))}
                </TabPanel>
            ))}
        </StyledGridWrapper>
    );
}