import {useEffect, useState} from 'react';
import {useTranslation} from 'react-i18next';
import {toast} from 'sonner';
import {RefreshCw} from 'lucide-react';

import {Button} from '@/components/ui/button';
import {Card} from '@/components/ui/card';
import {Skeleton} from '@/components/ui/skeleton';
import AchievementsCard from '../components/AchievementsCard.jsx';
import ActivityCard from '../components/ActivityCard.jsx';
import CurrentlyPlayingCard from '../components/CurrentlyPlayingCard.jsx';
import DashboardHint from '../components/DashboardHint.jsx';
import DashboardWelcomeCard from '../components/DashboardWelcomeCard.jsx';
import MostPlayedCard from '../components/MostPlayedCard.jsx';
import PileOfShameCard from '../components/PileOfShameCard.jsx';
import SteamGameCount from '../components/SteamGameCount';
import UpNextCard from '../components/UpNextCard.jsx';
import SyncChangesBanner from '../components/SyncChangesBanner.jsx';
import WhatsNewDialog from '../components/WhatsNewDialog.jsx';
import useDashboardData from '../hooks/useDashboardData.js';
import useLibrarySync from '../hooks/useLibrarySync.js';
import useForceSync from '../hooks/useForceSync.js';
import PageContainer from '../components/PageContainer.jsx';
import useSteamProfile from '../hooks/useSteamProfile.js';
import useUserStats from '../hooks/useUserStats.js';
import useSaveResponse from '../hooks/useSaveResponse.js';
import useStatCharts from '../hooks/useStatCharts.js';
import {chartProps} from '../utils/statCharts.js';
import TileGrid from '../components/TileGrid.jsx';
import {StatDrillProvider} from '../components/stats/StatDrill.jsx';
import statGroupTile from '../components/stats/statGroupTile.jsx';
import {
    DASHBOARD_TILES, DASHBOARD_TITLES, DEFAULT_DASHBOARD, normalizeLayout, PLAYING_GAMES, saveTiles, statGroup, TOP_GAMES, UP_NEXT_GAMES,
} from '../utils/tiles.js';
import {usePreferences} from '../context/PreferencesContext.jsx';
import {useCurrentUserContext} from '../context/CurrentUserContext.jsx';

const Dashboard = () => {
    const {t} = useTranslation();
    const {user: userData, updateUser} = useCurrentUserContext();
    const {
        steamData, topGames, playing, upNext, summary, summaryFailed, activity, achievements, isLoading, error,
        fetchSummary, reloadLibrary,
    } = useDashboardData();
    const [shuffling, setShuffling] = useState(false);
    const [editing, setEditing] = useState(false);
    const runSave = useSaveResponse();
    const {charts, change} = useStatCharts();
    const layout = normalizeLayout(userData?.settings?.dashboardTiles, DASHBOARD_TILES, DEFAULT_DASHBOARD);
    // The stat groups of the shown stat tiles, and TREND for the pile card and the "pile grew" hint. Waits for the
    // saved layout in /me.
    const statGroups = [...new Set([...layout.map((tile) => statGroup(tile.id)).filter(Boolean), 'TREND'])].sort();
    const stats = useUserStats(statGroups, userData != null);

    const shuffleSuggestion = async () => {
        setShuffling(true);
        if (!await fetchSummary(summary?.suggestion?.appid)) {
            toast.error(t('DASHBOARD.SUMMARY_FAILED'));
        }
        setShuffling(false);
    };

    const hasSteamId = !!userData?.steamId;
    // A PlayStation link syncs too, also without a Steam ID.
    const canSync = hasSteamId || !!steamData.canSync;
    const showLibrary = canSync || steamData.count > 0;
    const {appearance, equipped} = usePreferences();
    const steamProfile = useSteamProfile(hasSteamId);
    const bannerAppid = appearance.showBanner
        ? appearance.bannerAppid ?? activity?.recentGames?.[0]?.appid ?? null
        : null;
    const sync = useLibrarySync({
        enabled: canSync,
        expectInitialSync: canSync && steamData.count === 0,
        onComplete: () => {
            reloadLibrary();
            stats.reload();
        },
    });
    const {watch} = sync;
    const forceSync = useForceSync(watch);
    useEffect(() => {
        if (steamData.syncStarted) watch();
    }, [steamData, watch]);

    if (isLoading) {
        return <DashboardSkeleton/>;
    }

    if (error) {
        return (
            <div className="py-24 text-center text-destructive">
                {t(error)}
            </div>
        );
    }

    const saveLayout = async (next) => {
        // The default is saved as "never changed", so a later change of the default reaches this user too.
        const tiles = JSON.stringify(next) === JSON.stringify(DEFAULT_DASHBOARD) ? null : next;
        if (!await runSave(() => saveTiles('dashboard-tiles', tiles))) return;
        updateUser((d) => ({...d, settings: {...d.settings, dashboardTiles: tiles}}));
        setEditing(false);
    };

    const renderTile = (id, size) => {
        switch (id) {
            case 'GAME_COUNT': return showLibrary && <SteamGameCount targetCount={steamData.count}/>;
            case 'MOST_PLAYED':
                return showLibrary && <MostPlayedCard games={topGames.slice(0, TOP_GAMES[size])} syncing={sync.isRunning}
                                       equipped={equipped} {...chartProps(charts, change, 'TOP_GAMES')}/>;
            case 'PLAYING':
                return showLibrary && (
                    <CurrentlyPlayingCard games={playing.slice(0, PLAYING_GAMES[size])} syncing={sync.isRunning} wide={size === 'L'}/>
                );
            case 'UP_NEXT': return showLibrary && <UpNextCard games={upNext.slice(0, UP_NEXT_GAMES[size])}/>;
            case 'PILE_OF_SHAME':
                if (!showLibrary) return null;
                if (summary) {
                    return <PileOfShameCard summary={summary} trend={stats.stats?.trend} syncing={sync.isRunning}
                                            onShuffle={shuffleSuggestion} shuffling={shuffling}/>;
                }
                return summaryFailed && (
                    <Card className="items-center justify-center gap-3 p-6 text-center text-sm text-muted-foreground">
                        {t('DASHBOARD.SUMMARY_FAILED')}
                        <Button variant="outline" size="sm" onClick={() => fetchSummary()}>
                            <RefreshCw/>{t('DASHBOARD.RETRY')}
                        </Button>
                    </Card>
                );
            case 'ACTIVITY': return canSync && activity && <ActivityCard activity={activity} charts={charts} onChart={change}/>;
            case 'ACHIEVEMENTS': return hasSteamId && achievements && <AchievementsCard summary={achievements}/>;
            default: return statGroupTile(id, stats.stats, true, charts, change);
        }
    };

    return (
        <StatDrillProvider source="own">
            <PageContainer className="p-4 md:p-8 space-y-6">
                <DashboardWelcomeCard bannerAppid={bannerAppid} avatarUrl={steamProfile?.avatarUrl}
                                      equipped={equipped}
                                      sync={sync} forceSync={forceSync} canSync={canSync} editing={editing} onCustomize={() => setEditing(true)}/>
                {canSync && <SyncChangesBanner lastSyncedAt={sync.lastSyncedAt}/>}

                <TileGrid tiles={DASHBOARD_TILES} titles={DASHBOARD_TITLES} layout={layout} renderTile={renderTile} editing={editing}
                          defaultLayout={DEFAULT_DASHBOARD} onSave={saveLayout} onCancel={() => setEditing(false)}/>
                <WhatsNewDialog/>
                {/* Last child: space-y gives every other child a bottom margin, which would move the fixed card. */}
                <DashboardHint user={userData} canSync={canSync} summary={summaryFailed ? null : summary ?? undefined}
                               trend={stats.failed ? null : stats.stats ? stats.stats.trend ?? null : undefined}/>
            </PageContainer>
        </StatDrillProvider>
    );
};

function DashboardSkeleton() {
    return (
        <PageContainer className="p-4 md:p-8 space-y-6">
            <Skeleton className="h-40 rounded-xl"/>
            <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
                <Skeleton className="h-64 rounded-xl"/>
                <Skeleton className="h-64 rounded-xl md:col-span-2"/>
            </div>
        </PageContainer>
    );
}

export default Dashboard;