'use client';

import { useQueryClient } from '@tanstack/react-query';
import Link from 'next/link';
import { useCallback, useEffect, useMemo, useState } from 'react';
import { Suspense } from 'react';
import { format } from 'date-fns';
import { Bot, Download, ExternalLink, NotebookPen, Search, TimerReset } from 'lucide-react';
import { useSearchParams } from 'next/navigation';
import { AppShell } from '@/components/shell/app-shell';
import { Panel } from '@/components/ui/panel';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { useAuthGuard } from '@/hooks/use-auth-guard';
import { useLinkPrefetch } from '@/hooks/use-link-prefetch';
import {
  createResearchJournalEntry,
  queueFilingAnalysis,
  queueFilingSync
} from '@/lib/api';
import type { Filing } from '@/lib/types';
import { formatCurrencyByScale, type NumberScaleUnit } from '@/lib/format';
import { queryKeys } from '@/lib/query/keys';
import { filingsQueryOptions } from '@/lib/query/options';

const FINANCIAL_VALUE_SCALE_OPTIONS: Array<{ value: NumberScaleUnit; label: string }> = [
  { value: 'thousands', label: 'Thousands (K)' },
  { value: 'millions', label: 'Millions (M)' },
  { value: 'billions', label: 'Billions (B)' }
];

export default function FilingsPage() {
  return (
    <Suspense fallback={<div className="flex min-h-screen items-center justify-center text-sm text-[color:var(--terminal-muted)]">Opening filings stream...</div>}>
      <FilingsPageContent />
    </Suspense>
  );
}

function formatFilingDate(value: string) {
  const date = new Date(value);

  if (Number.isNaN(date.getTime())) {
    return 'Unknown';
  }

  return format(date, 'MMM dd, yyyy');
}

function hasFinancialSnapshot(filing: Filing) {
  return filing.filing_type === '10-K' || filing.filing_type === '10-Q';
}

function parseTagsInput(input: string) {
  const unique = new Set<string>();

  for (const segment of input.split(',')) {
    const tag = segment.trim();
    if (!tag) {
      continue;
    }

    unique.add(tag);
  }

  return [...unique];
}

function asScaledFinancialSnapshot(
  value: number | null | undefined,
  scale: NumberScaleUnit
) {
  if (value === null || value === undefined) {
    return 'n/a';
  }

  return formatCurrencyByScale(value, scale);
}

function resolveOriginalFilingUrl(filing: Filing) {
  if (filing.filing_url) {
    return filing.filing_url;
  }

  if (!filing.primary_document) {
    return null;
  }

  const cikDigits = filing.cik.replace(/\D/g, '');
  const cikValue = Number.parseInt(cikDigits, 10);

  if (!cikDigits || Number.isNaN(cikValue)) {
    return null;
  }

  const compactAccession = filing.accession_number.replace(/-/g, '');
  if (!compactAccession) {
    return null;
  }

  return `https://www.sec.gov/Archives/edgar/data/${cikValue}/${compactAccession}/${filing.primary_document}`;
}

type FilingExternalLinkProps = {
  href: string;
  label: string;
};

function FilingExternalLink({ href, label }: FilingExternalLinkProps) {
  return (
    <a
      href={href}
      target="_blank"
      rel="noreferrer"
      className="inline-flex items-center gap-1 rounded-md border border-[color:var(--line-weak)] px-2 py-1 text-xs text-[color:var(--accent)] transition hover:border-[color:var(--line-strong)] hover:text-[color:var(--accent-strong)]"
    >
      {label}
      <ExternalLink className="size-3" />
    </a>
  );
}

function FilingsPageContent() {
  const { isPending, isAuthenticated } = useAuthGuard();
  const searchParams = useSearchParams();
  const queryClient = useQueryClient();
  const { prefetchReport } = useLinkPrefetch();

  const [filings, setFilings] = useState<Filing[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [syncTickerInput, setSyncTickerInput] = useState('');
  const [syncCategoryInput, setSyncCategoryInput] = useState('');
  const [syncTagsInput, setSyncTagsInput] = useState('');
  const [filterTickerInput, setFilterTickerInput] = useState('');
  const [searchTicker, setSearchTicker] = useState('');
  const [financialValueScale, setFinancialValueScale] = useState<NumberScaleUnit>('millions');
  const [actionNotice, setActionNotice] = useState<string | null>(null);

  useEffect(() => {
    const ticker = searchParams.get('ticker');
    if (ticker) {
      const normalized = ticker.toUpperCase();
      setSyncTickerInput(normalized);
      setFilterTickerInput(normalized);
      setSearchTicker(normalized);
    }
  }, [searchParams]);

  const loadFilings = useCallback(async (ticker?: string) => {
    const options = filingsQueryOptions({ ticker, limit: 120 });

    if (!queryClient.getQueryData(options.queryKey)) {
      setLoading(true);
    }

    setError(null);

    try {
      const response = await queryClient.fetchQuery(options);
      setFilings(response.filings);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Unable to fetch filings');
    } finally {
      setLoading(false);
    }
  }, [queryClient]);

  useEffect(() => {
    if (!isPending && isAuthenticated) {
      void loadFilings(searchTicker || undefined);
    }
  }, [isPending, isAuthenticated, searchTicker, loadFilings]);

  const triggerSync = async () => {
    if (!syncTickerInput.trim()) {
      return;
    }

    try {
      await queueFilingSync({
        ticker: syncTickerInput.trim().toUpperCase(),
        limit: 20,
        category: syncCategoryInput.trim() || undefined,
        tags: parseTagsInput(syncTagsInput)
      });
      void queryClient.invalidateQueries({ queryKey: queryKeys.recentTasks(20) });
      void queryClient.invalidateQueries({ queryKey: ['filings'] });
      await loadFilings(searchTicker || undefined);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to queue filing sync');
    }
  };

  const triggerAnalysis = async (accessionNumber: string) => {
    try {
      await queueFilingAnalysis(accessionNumber);
      void queryClient.invalidateQueries({ queryKey: queryKeys.recentTasks(20) });
      void queryClient.invalidateQueries({ queryKey: ['report'] });
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to queue filing analysis');
    }
  };

  const addToJournal = async (filing: Filing) => {
    try {
      await createResearchJournalEntry({
        ticker: filing.ticker,
        accessionNumber: filing.accession_number,
        entryType: 'filing_note',
        title: `${filing.filing_type} filing note`,
        bodyMarkdown: [
          `Captured filing note for ${filing.company_name} (${filing.ticker}).`,
          `Filed: ${formatFilingDate(filing.filing_date)}`,
          `Accession: ${filing.accession_number}`,
          '',
          filing.analysis?.text ?? filing.analysis?.legacyInsights ?? 'Follow up on this filing from the stream.'
        ].join('\n')
      });
      void queryClient.invalidateQueries({ queryKey: queryKeys.researchJournal(filing.ticker) });
      void queryClient.invalidateQueries({ queryKey: queryKeys.companyAnalysis(filing.ticker) });
      void queryClient.invalidateQueries({ queryKey: queryKeys.watchlist() });
      setActionNotice(`Saved ${filing.accession_number} to the ${filing.ticker} journal.`);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to add filing to journal');
    }
  };

  const groupedByTicker = useMemo(() => {
    const counts = new Map<string, number>();

    for (const filing of filings) {
      counts.set(filing.ticker, (counts.get(filing.ticker) ?? 0) + 1);
    }

    return counts;
  }, [filings]);

  const selectedFinancialScaleLabel = useMemo(() => {
    return FINANCIAL_VALUE_SCALE_OPTIONS.find((option) => option.value === financialValueScale)?.label ?? 'Millions (M)';
  }, [financialValueScale]);

  if (isPending || !isAuthenticated) {
    return <div className="flex min-h-screen items-center justify-center text-sm text-[color:var(--terminal-muted)]">Opening filings stream...</div>;
  }

  return (
    <AppShell
      title="Filings"
      subtitle="Sync SEC submissions, keep 10-K/10-Q financial snapshots, and analyze qualitative signals from other forms."
      activeTicker={searchTicker || null}
      actions={(
        <Button
          variant="secondary"
          className="w-full sm:w-auto"
          onClick={() => {
            void queryClient.invalidateQueries({ queryKey: queryKeys.filings(searchTicker || null, 120) });
            void loadFilings(searchTicker || undefined);
          }}
        >
          <TimerReset className="size-4" />
          Refresh table
        </Button>
      )}
    >
      <div className="grid grid-cols-1 gap-5 lg:grid-cols-[1.2fr_1fr]">
        <Panel title="Sync Controller" subtitle="Queue ingestion jobs by ticker symbol.">
          <form
            className="flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-center"
            onSubmit={(event) => {
              event.preventDefault();
              void triggerSync();
            }}
          >
            <Input
              value={syncTickerInput}
              onChange={(event) => setSyncTickerInput(event.target.value.toUpperCase())}
              placeholder="Ticker (AAPL)"
              className="w-full sm:max-w-xs"
            />
            <Input
              value={syncCategoryInput}
              onChange={(event) => setSyncCategoryInput(event.target.value)}
              placeholder="Category (optional)"
              className="w-full sm:max-w-xs"
            />
            <Input
              value={syncTagsInput}
              onChange={(event) => setSyncTagsInput(event.target.value)}
              placeholder="Tags (comma-separated)"
              className="w-full sm:max-w-xs"
            />
            <Button type="submit" className="w-full sm:w-auto">
              <Download className="size-4" />
              Queue sync
            </Button>
          </form>
        </Panel>

        <Panel title="Search Index" subtitle="Filter by ticker in the local filing index.">
          <form
            className="flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-center"
            onSubmit={(event) => {
              event.preventDefault();
              setSearchTicker(filterTickerInput.trim().toUpperCase());
            }}
          >
            <Input
              value={filterTickerInput}
              onChange={(event) => setFilterTickerInput(event.target.value.toUpperCase())}
              placeholder="Ticker filter"
              className="w-full sm:max-w-xs"
            />
            <Button type="submit" variant="secondary" className="w-full sm:w-auto">
              <Search className="size-4" />
              Apply
            </Button>
            <Button
              type="button"
              variant="ghost"
              className="w-full sm:w-auto"
              onClick={() => {
                setFilterTickerInput('');
                setSearchTicker('');
              }}
            >
              Clear
            </Button>
          </form>
        </Panel>
      </div>

      <Panel
        title="Filing Ledger"
        subtitle={`${filings.length} records loaded${searchTicker ? ` for ${searchTicker}` : ''}. Values shown in ${selectedFinancialScaleLabel}.`}
        actions={(
          <div className="flex flex-wrap justify-end gap-2">
            {FINANCIAL_VALUE_SCALE_OPTIONS.map((option) => (
              <Button
                key={option.value}
                type="button"
                variant={option.value === financialValueScale ? 'primary' : 'ghost'}
                className="px-2 py-1 text-xs"
                onClick={() => setFinancialValueScale(option.value)}
              >
                {option.label}
              </Button>
            ))}
          </div>
        )}
      >
        {error ? <p className="text-sm text-[#ffb5b5]">{error}</p> : null}
        {actionNotice ? <p className="mt-2 text-sm text-[color:var(--accent)]">{actionNotice}</p> : null}
        {loading ? (
          <p className="text-sm text-[color:var(--terminal-muted)]">Fetching filings...</p>
        ) : filings.length === 0 ? (
          <p className="text-sm text-[color:var(--terminal-muted)]">No filings available. Queue a sync job to ingest fresh SEC data.</p>
        ) : (
          <div className="space-y-3">
            <div className="space-y-3 lg:hidden">
              {filings.map((filing) => {
                const financialForm = hasFinancialSnapshot(filing);
                const revenue = filing.metrics?.revenue;
                const hasAnalysis = Boolean(filing.analysis?.text || filing.analysis?.legacyInsights);
                const originalFilingUrl = resolveOriginalFilingUrl(filing);

                return (
                  <article
                    key={filing.accession_number}
                    className="rounded-xl border border-[color:var(--line-weak)] bg-[color:var(--panel-soft)] p-4"
                  >
                    <div className="flex flex-wrap items-start justify-between gap-3">
                      <div>
                        <p className="text-sm font-semibold text-[color:var(--terminal-bright)]">{filing.ticker} · {filing.filing_type}</p>
                        <p className="text-xs text-[color:var(--terminal-muted)]">{formatFilingDate(filing.filing_date)}</p>
                      </div>
                      <p className="text-xs text-[color:var(--terminal-muted)]">{hasAnalysis ? 'AI ready' : 'AI pending'}</p>
                    </div>

                    <p className="mt-2 text-sm text-[color:var(--terminal-bright)]">{filing.company_name}</p>

                    <dl className="mt-3 grid grid-cols-1 gap-2 text-xs sm:grid-cols-2">
                      <div className="rounded-md border border-[color:var(--line-weak)] px-2 py-1.5">
                        <dt className="text-[color:var(--terminal-muted)]">Financial Snapshot</dt>
                        <dd className="mt-1 text-[color:var(--terminal-bright)]">
                          {financialForm ? asScaledFinancialSnapshot(revenue, financialValueScale) : 'Qualitative filing'}
                        </dd>
                      </div>
                      <div className="rounded-md border border-[color:var(--line-weak)] px-2 py-1.5">
                        <dt className="text-[color:var(--terminal-muted)]">Accession</dt>
                        <dd className="mt-1 break-all text-[color:var(--terminal-bright)]">{filing.accession_number}</dd>
                      </div>
                    </dl>

                    <div className="mt-3 flex flex-wrap items-center gap-2">
                      {originalFilingUrl ? (
                        <FilingExternalLink href={originalFilingUrl} label="Original filing" />
                      ) : (
                        <span className="text-xs text-[color:var(--terminal-muted)]">Original filing unavailable</span>
                      )}
                      {filing.submission_url ? (
                        <FilingExternalLink href={filing.submission_url} label="Submission" />
                      ) : null}
                      <Button
                        variant="ghost"
                        onClick={() => void triggerAnalysis(filing.accession_number)}
                        className="px-2 py-1 text-xs"
                      >
                        <Bot className="size-3" />
                        Analyze
                      </Button>
                      <Button
                        variant="ghost"
                        onClick={() => void addToJournal(filing)}
                        className="px-2 py-1 text-xs"
                      >
                        <NotebookPen className="size-3" />
                        Add to journal
                      </Button>
                      {hasAnalysis ? (
                        <Link
                          href={`/analysis/reports/${filing.ticker}/${encodeURIComponent(filing.accession_number)}`}
                          onMouseEnter={() => prefetchReport(filing.ticker, filing.accession_number)}
                          onFocus={() => prefetchReport(filing.ticker, filing.accession_number)}
                          className="inline-flex items-center rounded-md border border-[color:var(--line-weak)] px-2 py-1 text-xs text-[color:var(--accent)] transition hover:border-[color:var(--line-strong)] hover:text-[color:var(--accent-strong)]"
                        >
                          Open summary
                        </Link>
                      ) : null}
                    </div>
                  </article>
                );
              })}
            </div>

            <div className="hidden overflow-x-auto lg:block">
              <table className="data-table w-full">
                <thead>
                  <tr>
                    <th>Ticker</th>
                    <th>Type</th>
                    <th>Filed</th>
                    <th>Revenue Snapshot</th>
                    <th>Company</th>
                    <th>AI</th>
                    <th>Links</th>
                    <th>Action</th>
                  </tr>
                </thead>
                <tbody>
                  {filings.map((filing) => {
                    const financialForm = hasFinancialSnapshot(filing);
                    const revenue = filing.metrics?.revenue;
                    const hasAnalysis = Boolean(filing.analysis?.text || filing.analysis?.legacyInsights);
                    const originalFilingUrl = resolveOriginalFilingUrl(filing);

                    return (
                      <tr key={filing.accession_number}>
                        <td>
                          <div className="font-medium text-[color:var(--terminal-bright)]">{filing.ticker}</div>
                          <div className="text-xs text-[color:var(--terminal-muted)]">{groupedByTicker.get(filing.ticker)} filings</div>
                        </td>
                        <td>{filing.filing_type}</td>
                        <td>{formatFilingDate(filing.filing_date)}</td>
                        <td>{financialForm ? asScaledFinancialSnapshot(revenue, financialValueScale) : 'Qualitative filing'}</td>
                        <td className="max-w-[18rem]">{filing.company_name}</td>
                        <td>{hasAnalysis ? 'Ready' : 'Not generated'}</td>
                        <td>
                          <div className="flex flex-wrap items-center gap-2">
                            {originalFilingUrl ? (
                              <FilingExternalLink href={originalFilingUrl} label="Original" />
                            ) : (
                              <span className="text-xs text-[color:var(--terminal-muted)]">Unavailable</span>
                            )}
                            {filing.submission_url ? (
                              <FilingExternalLink href={filing.submission_url} label="Submission" />
                            ) : null}
                          </div>
                        </td>
                        <td>
                          <div className="flex flex-wrap items-center gap-2">
                            <Button
                              variant="ghost"
                              onClick={() => void triggerAnalysis(filing.accession_number)}
                              className="px-2 py-1 text-xs"
                            >
                              <Bot className="size-3" />
                              Analyze
                            </Button>
                            <Button
                              variant="ghost"
                              onClick={() => void addToJournal(filing)}
                              className="px-2 py-1 text-xs"
                            >
                              <NotebookPen className="size-3" />
                              Journal
                            </Button>
                            {hasAnalysis ? (
                              <Link
                                href={`/analysis/reports/${filing.ticker}/${encodeURIComponent(filing.accession_number)}`}
                                onMouseEnter={() => prefetchReport(filing.ticker, filing.accession_number)}
                                onFocus={() => prefetchReport(filing.ticker, filing.accession_number)}
                                className="inline-flex items-center rounded-md border border-[color:var(--line-weak)] px-2 py-1 text-xs text-[color:var(--accent)] transition hover:border-[color:var(--line-strong)] hover:text-[color:var(--accent-strong)]"
                              >
                                Summary
                              </Link>
                            ) : null}
                          </div>
                        </td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </div>
          </div>
        )}
      </Panel>
    </AppShell>
  );
}
