import DateRangeSelect from '@/analytics/views/Stats/components/date-range-select';
import DisabledSourcesIndicator from '@/shared/analytics/disabled-sources-indicator';
import GrowthKPIs from './components/growth-kpis';
import GrowthSources from './components/growth-sources';
import NewSubscribersCadence from './components/new-subscribers-cadence';
import PaidMembersChangeChart from './components/paid-subscription-change-chart';
import React, {useEffect, useMemo, useState} from 'react';
import SortButton from '@/analytics/views/Stats/components/sort-button';
import StatsHeader from '@/analytics/views/Stats/layout/stats-header';
import StatsLayout from '@/analytics/views/Stats/layout/stats-layout';
import StatsView from '@/analytics/views/Stats/layout/stats-view';
import {Button, Card, CardContent, CardDescription, CardHeader, CardTitle, EmptyIndicator, NavbarActions, Skeleton, Table, TableBody, TableCell, TableHead, TableHeader, TableRow, Tabs, TabsList, TabsTrigger} from '@tryghost/shade/components';
import {CONTENT_TYPES, type ContentType, getContentTitle, getGrowthContentDescription} from '@/analytics/utils/content-helpers';
import {LucideIcon, formatDisplayDate, formatNumber} from '@tryghost/shade/utils';
import {centsToDollars} from '@tryghost/shade/app';
import {getClickHandler} from '@/analytics/utils/url-helpers';
import {getPeriodText} from '@/shared/analytics/chart-helpers';
import {useAppContext} from '@tryghost/admin-x-framework';
import {useAnalytics} from '@/analytics/providers/analytics-context';
import {useAnalyticsData} from '@/shared/analytics/use-analytics-data';
import {useGrowthStats} from '@/analytics/hooks/use-growth-stats';
import {useNavigate, useSearchParams} from '@tryghost/admin-x-framework';
import {useTopPostsStatsWithRange} from '@/analytics/hooks/use-top-posts-stats-with-range';
import type {TopPostStatItem} from '@tryghost/admin-x-framework/api/stats';

// Type for unified content data that combines top content with growth metrics
interface UnifiedGrowthContentData {
    pathname?: string;
    attribution_url: string;
    attribution_type: string;
    attribution_id: string;
    title: string;
    post_id?: string;
    post_uuid?: string;
    free_members: number;
    paid_members: number;
    mrr: number;
    percentage?: number;
    published_at: string;
    url_exists?: boolean;
}

type TopPostsOrder = 'free_members desc' | 'paid_members desc' | 'mrr desc';
type SourcesOrder = 'free_members desc' | 'paid_members desc' | 'mrr desc' | 'source desc';
type UnifiedSortOrder = TopPostsOrder | SourcesOrder;

const Growth: React.FC = () => {
    const {range} = useAnalytics();
    const {site, settings} = useAnalyticsData();

    // Get site timezone from settings for displaying dates consistently
    const siteTimezone = String(settings.find(setting => setting.key === 'timezone')?.value || 'Etc/UTC');
    const navigate = useNavigate();
    const [sortBy, setSortBy] = useState<UnifiedSortOrder>('free_members desc');
    const [selectedContentType, setSelectedContentType] = useState<ContentType>(CONTENT_TYPES.POSTS_AND_PAGES);
    const [searchParams] = useSearchParams();
    const {appSettings} = useAppContext();

    // Get the initial tab from URL search parameters
    const initialTab = searchParams.get('tab') || 'total-members';

    // Track current KPI tab to conditionally show paid member charts
    const [currentKpiTab, setCurrentKpiTab] = useState(initialTab);

    // Sync currentKpiTab with URL changes (one-way: URL -> state only)
    useEffect(() => {
        if (initialTab !== currentKpiTab) {
            setCurrentKpiTab(initialTab);
        }
    }, [initialTab]);

    // Get stats from custom hook once
    const {isLoading, chartData, totals, currencySymbol, subscriptionData} = useGrowthStats(range);

    // Get growth data with post_type filtering - only call when not on Sources tab
    const {data: topPostsData, isLoading: isTopPostsLoading} = useTopPostsStatsWithRange(
        range,
        sortBy as TopPostsOrder,
        selectedContentType as 'posts' | 'pages' | 'posts_and_pages'
    );

    // Sources data is now handled by the GrowthSources component

    // Transform and deduplicate data for display
    const transformedTopPosts = useMemo<UnifiedGrowthContentData[]>(() => {
        const growthData = topPostsData?.stats || [];

        // First deduplicate by post_id/title to handle backend duplicates
        const uniqueData = growthData.reduce((acc: Map<string, TopPostStatItem>, item: TopPostStatItem) => {
            const key = item.post_id || (item.title && item.title.trim() !== '' ? item.title : item.attribution_url);
            if (!key) {
                // Skip items that have no valid key - this should not happen with proper backend data
                return acc;
            }
            if (!acc.has(key)) {
                acc.set(key, item);
            } else {
                // If duplicate, sum the metrics
                const existing = acc.get(key)!;
                existing.free_members += item.free_members;
                existing.paid_members += item.paid_members;
                existing.mrr += item.mrr;
                acc.set(key, existing);
            }
            return acc;
        }, new Map<string, TopPostStatItem>());

        const filteredData = Array.from(uniqueData.values());

        // Calculate total metrics for the filtered dataset for percentage calculation
        const totalFreeMembers = filteredData.reduce((sum: number, item: TopPostStatItem) => sum + item.free_members, 0);
        const totalPaidMembers = filteredData.reduce((sum: number, item: TopPostStatItem) => sum + item.paid_members, 0);
        const totalMrr = filteredData.reduce((sum: number, item: TopPostStatItem) => sum + item.mrr, 0);

        // Add percentage based on current sort
        return filteredData.map((item: TopPostStatItem) => {
            let percentage = 0;
            if (sortBy.includes('free_members') && totalFreeMembers > 0) {
                percentage = item.free_members / totalFreeMembers;
            } else if (sortBy.includes('paid_members') && totalPaidMembers > 0) {
                percentage = item.paid_members / totalPaidMembers;
            } else if (sortBy.includes('mrr') && totalMrr > 0) {
                percentage = item.mrr / totalMrr;
            }

            return {
                title: item.title || item.attribution_url,
                post_id: item.post_id,
                attribution_url: item.attribution_url,
                attribution_type: item.attribution_type,
                attribution_id: item.attribution_id,
                free_members: item.free_members,
                paid_members: item.paid_members,
                mrr: item.mrr,
                percentage,
                published_at: item.published_at,
                url_exists: item.url_exists ?? true
            };
        });
    }, [topPostsData, sortBy]);

    const isPageLoading = isLoading;
    const isTableLoading = isLoading || isTopPostsLoading;

    return (
        <StatsLayout>
            <StatsHeader>
                <NavbarActions>
                    <DateRangeSelect />
                </NavbarActions>
            </StatsHeader>
            <StatsView data={isPageLoading ? undefined : chartData} isLoading={false} loadingComponent={<></>}>
                <Card data-testid='total-members-card'>
                    <CardContent>
                        <GrowthKPIs
                            chartData={chartData}
                            currencySymbol={currencySymbol}
                            initialTab={initialTab}
                            isLoading={isPageLoading}
                            totals={totals}
                            onTabChange={setCurrentKpiTab}
                        />
                    </CardContent>
                </Card>
                {appSettings?.paidMembersEnabled && currentKpiTab === 'paid-members' && (
                    <div className='grid grid-cols-1 gap-6 lg:grid-cols-2 xl:grid-cols-[2fr_minmax(460px,1fr)]'>
                        <PaidMembersChangeChart
                            isLoading={isPageLoading}
                            memberData={chartData}
                            range={range}
                            subscriptionData={subscriptionData}
                        />
                        <NewSubscribersCadence isLoading={isPageLoading} range={range} />
                    </div>
                )}
                <Card className='w-full overflow-x-auto' data-testid='top-content-card'>
                    <CardHeader>
                        <CardTitle>{getContentTitle(selectedContentType)}</CardTitle>
                        <CardDescription>{getGrowthContentDescription(selectedContentType, range, getPeriodText)}</CardDescription>
                    </CardHeader>
                    <CardContent>
                        <Table>
                            <TableHeader>
                                <TableRow className='[&>th]:h-auto [&>th]:pt-0 [&>th]:pb-2'>
                                    <TableHead className='min-w-[320px] pl-0'>
                                        <Tabs defaultValue={selectedContentType} variant='button-sm' onValueChange={(value: string) => {
                                            setSelectedContentType(value as ContentType);
                                        }}>
                                            <TabsList>
                                                <TabsTrigger value={CONTENT_TYPES.POSTS_AND_PAGES}>Posts & pages</TabsTrigger>
                                                <TabsTrigger value={CONTENT_TYPES.POSTS}>Posts</TabsTrigger>
                                                <TabsTrigger value={CONTENT_TYPES.PAGES}>Pages</TabsTrigger>
                                                <TabsTrigger value={CONTENT_TYPES.SOURCES}>Sources</TabsTrigger>
                                            </TabsList>
                                        </Tabs>
                                    </TableHead>
                                    <TableHead className='w-[140px] text-right'>
                                        {appSettings?.paidMembersEnabled ?
                                            <SortButton activeSortBy={sortBy} setSortBy={setSortBy} sortBy='free_members desc'>
                                                Free members
                                            </SortButton>
                                            :
                                            <>Free members</>
                                        }
                                    </TableHead>
                                    {appSettings?.paidMembersEnabled &&
                                        <>
                                            <TableHead className='w-[140px] text-right'>
                                                <SortButton activeSortBy={sortBy} setSortBy={setSortBy} sortBy='paid_members desc'>
                                                    Paid members
                                                </SortButton>
                                            </TableHead>
                                            <TableHead className='w-[140px] text-right'>
                                                <SortButton activeSortBy={sortBy} setSortBy={setSortBy} sortBy='mrr desc'>
                                                    MRR impact
                                                </SortButton>
                                            </TableHead>
                                        </>
                                    }
                                </TableRow>
                            </TableHeader>
                            {selectedContentType === CONTENT_TYPES.SOURCES ?
                                <GrowthSources
                                    limit={20}
                                    range={range}
                                    setSortBy={(newSortBy: SourcesOrder) => setSortBy(newSortBy)}
                                    showViewAll={true}
                                    sortBy={sortBy}
                                />
                                :
                                <TableBody>
                                    {isTableLoading ? (
                                        <TableRow className='last:border-none'>
                                            <TableCell className='border-none py-2' colSpan={1}>
                                                <Skeleton containerClassName='space-y-2' count={5} maxWidth={75} randomize />
                                            </TableCell>
                                        </TableRow>
                                    ) : (
                                        !appSettings?.analytics.membersTrackSources ? (
                                            <TableRow className='last:border-none'>
                                                <TableCell className='border-none py-12 group-hover:bg-transparent!' colSpan={appSettings?.paidMembersEnabled ? 4 : 2}>
                                                    <DisabledSourcesIndicator />
                                                </TableCell>
                                            </TableRow>
                                        ) : transformedTopPosts.length > 0 ? (
                                            transformedTopPosts.map((post, index) => (
                                                <TableRow key={`${selectedContentType}-${post.post_id || `${post.title}-${index}`}`} className='last:border-none'>
                                                    <TableCell>
                                                        <div className='group/link inline-flex flex-col items-start gap-px'>
                                                            {post.post_id && post.attribution_type === 'post' ?
                                                                <Button
                                                                    className='h-auto p-0 text-left leading-tight font-medium whitespace-normal hover:underline!'
                                                                    title='View post analytics'
                                                                    variant='link'
                                                                    onClick={getClickHandler(post.attribution_url, post.post_id, site.url || '', navigate, post.attribution_type)}
                                                                >
                                                                    {post.title}
                                                                </Button>
                                                                :
                                                                <span className='font-medium'>
                                                                    {post.title}
                                                                </span>
                                                            }
                                                            {post.published_at && formatDisplayDate && new Date(post.published_at).getTime() > 0 && (
                                                                <span className='text-muted-foreground'>Published on {formatDisplayDate(post.published_at, siteTimezone)}</span>
                                                            )}
                                                        </div>
                                                    </TableCell>
                                                    <TableCell className='text-right font-mono text-sm'>
                                                        {(post.free_members > 0 && '+')}{formatNumber(post.free_members)}
                                                    </TableCell>
                                                    {appSettings?.paidMembersEnabled &&
                                                        <>
                                                            <TableCell className='text-right font-mono text-sm'>
                                                                {(post.paid_members > 0 && '+')}{formatNumber(post.paid_members)}
                                                            </TableCell>
                                                            <TableCell className='text-right font-mono text-sm'>
                                                                {(post.mrr > 0 && '+')}{currencySymbol}{formatNumber(centsToDollars(post.mrr))}
                                                            </TableCell>
                                                        </>
                                                    }
                                                </TableRow>
                                            ))
                                        ) : (
                                            <TableRow className='border-none'>
                                                <TableCell className='py-12 group-hover:bg-transparent!' colSpan={appSettings?.paidMembersEnabled ? 4 : 2}>
                                                    <EmptyIndicator
                                                        description='Try adjusting your date range to see more data.'
                                                        title={`No conversions ${getPeriodText(range)}`}
                                                    >
                                                        <LucideIcon.ChartColumnIncreasing strokeWidth={1.5} />
                                                    </EmptyIndicator>
                                                </TableCell>
                                            </TableRow>
                                        )
                                    )}
                                </TableBody>
                            }
                        </Table>
                    </CardContent>
                </Card>
            </StatsView>
        </StatsLayout>
    );
};

export default Growth;
