'use client';

import { useCallback, useEffect, useMemo, useState } from 'react';
import { Suspense } from 'react';
import { format } from 'date-fns';
import { Bot, Download, ExternalLink, 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 { StatusPill } from '@/components/ui/status-pill';
import { useAuthGuard } from '@/hooks/use-auth-guard';
import { useTaskPoller } from '@/hooks/use-task-poller';
import { getTask, listFilings, queueFilingAnalysis, queueFilingSync } from '@/lib/api';
import type { Filing, Task } from '@/lib/types';
import { formatCompactCurrency } from '@/lib/format';

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 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 [filings, setFilings] = useState<Filing[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [syncTickerInput, setSyncTickerInput] = useState('');
  const [filterTickerInput, setFilterTickerInput] = useState('');
  const [searchTicker, setSearchTicker] = useState('');
  const [activeTask, setActiveTask] = useState<Task | 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) => {
    setLoading(true);
    setError(null);

    try {
      const response = await listFilings({ ticker, limit: 120 });
      setFilings(response.filings);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Unable to fetch filings');
    } finally {
      setLoading(false);
    }
  }, []);

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

  const polledTask = useTaskPoller({
    taskId: activeTask?.id ?? null,
    onTerminalState: async () => {
      setActiveTask(null);
      await loadFilings(searchTicker || undefined);
    }
  });

  const liveTask = polledTask ?? activeTask;

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

    try {
      const { task } = await queueFilingSync({ ticker: syncTickerInput.trim().toUpperCase(), limit: 20 });
      const latest = await getTask(task.id);
      setActiveTask(latest.task);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to queue filing sync');
    }
  };

  const triggerAnalysis = async (accessionNumber: string) => {
    try {
      const { task } = await queueFilingAnalysis(accessionNumber);
      const latest = await getTask(task.id);
      setActiveTask(latest.task);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to queue filing analysis');
    }
  };

  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]);

  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 Stream"
      subtitle="Sync SEC submissions and generate AI red-flag analysis asynchronously."
      actions={(
        <Button variant="secondary" className="w-full sm:w-auto" onClick={() => void loadFilings(searchTicker || undefined)}>
          <TimerReset className="size-4" />
          Refresh table
        </Button>
      )}
    >
      {liveTask ? (
        <Panel title="Active Task" subtitle={`${liveTask.task_type} is processing in the task engine.`}>
          <div className="flex flex-col gap-2 rounded-lg border border-[color:var(--line-weak)] bg-[color:var(--panel-soft)] px-3 py-2 sm:flex-row sm:items-center sm:justify-between">
            <p className="break-all text-sm text-[color:var(--terminal-bright)]">{liveTask.id}</p>
            <StatusPill status={liveTask.status} />
          </div>
          {liveTask.error ? <p className="mt-2 text-sm text-[#ff9898]">{liveTask.error}</p> : null}
        </Panel>
      ) : null}

      <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"
            />
            <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}` : ''}.`}>
        {error ? <p className="text-sm text-[#ffb5b5]">{error}</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 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)]">Revenue Snapshot</dt>
                        <dd className="mt-1 text-[color:var(--terminal-bright)]">{revenue ? formatCompactCurrency(revenue) : 'n/a'}</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>
                    </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 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>{revenue ? formatCompactCurrency(revenue) : 'n/a'}</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>
                          <Button
                            variant="ghost"
                            onClick={() => void triggerAnalysis(filing.accession_number)}
                            className="px-2 py-1 text-xs"
                          >
                            <Bot className="size-3" />
                            Analyze
                          </Button>
                        </td>
                      </tr>
                    );
                  })}
                </tbody>
              </table>
            </div>
          </div>
        )}
      </Panel>
    </AppShell>
  );
}