'use client';

import { useState } from 'react';
import { useQuery } from '@tanstack/react-query';

import { useRealtimeInvalidation } from '@/hooks/use-realtime-invalidation';
import { usePortContext } from '@/providers/port-provider';
import { apiFetch } from '@/lib/api/client';
import { PageHeader } from '@/components/shared/page-header';
import { ActivityFeed } from './activity-feed';
import { DateRangePicker } from './date-range-picker';
import { PipelineFunnelChart } from './pipeline-funnel-chart';
import { OccupancyTimelineChart } from './occupancy-timeline-chart';
import { RevenueBreakdownChart } from './revenue-breakdown-chart';
import { LeadSourceChart } from './lead-source-chart';
import { MyRemindersRail } from './my-reminders-rail';
import { WebsiteGlanceTile } from './website-glance-tile';
import { WidgetErrorBoundary } from './widget-error-boundary';
import { AlertRail } from '@/components/alerts/alert-rail';
import { isCustomRange, type DateRange } from '@/lib/analytics/range';

const PRESET_LABELS: Record<'today' | '7d' | '30d' | '90d', string> = {
  today: 'Today',
  '7d': 'Last 7 days',
  '30d': 'Last 30 days',
  '90d': 'Last 90 days',
};

function rangeLabel(range: DateRange): string {
  if (isCustomRange(range)) {
    const fmt: Intl.DateTimeFormatOptions = {
      month: 'short',
      day: 'numeric',
      year: 'numeric',
      timeZone: 'UTC',
    };
    const from = new Date(`${range.from}T00:00:00.000Z`).toLocaleDateString('en-US', fmt);
    const to = new Date(`${range.to}T00:00:00.000Z`).toLocaleDateString('en-US', fmt);
    return `${from} – ${to}`;
  }
  return PRESET_LABELS[range];
}

interface MeData {
  data?: {
    firstName?: string | null;
    displayName?: string | null;
  };
}

function timeOfDayGreeting(): string {
  const hour = new Date().getHours();
  if (hour < 5) return 'Up late';
  if (hour < 12) return 'Good morning';
  if (hour < 18) return 'Good afternoon';
  return 'Good evening';
}

export function DashboardShell() {
  const [range, setRange] = useState<DateRange>('30d');
  const { currentPort } = usePortContext();
  const portName = currentPort?.name ?? 'this port';

  // Reuses the existing ['me'] cache (5-minute staleTime) populated by
  // useTablePreferences elsewhere — usually a cache hit, so no extra
  // request. Falls back to a generic greeting if the profile isn't
  // available yet so we never block the dashboard render.
  const me = useQuery<MeData>({
    queryKey: ['me'],
    queryFn: ({ signal }) => apiFetch<MeData>('/api/v1/me', { signal }),
    staleTime: 5 * 60_000,
  });
  const firstName = me.data?.data?.firstName?.trim();
  // Time-aware greeting line, falls back to a generic "Welcome back" when
  // we don't know the user's first name yet (e.g. profile not filled out).
  const greeting = firstName
    ? `${timeOfDayGreeting()}, ${firstName}`
    : 'Welcome back';

  // Use a partial query-key prefix (no range segment) for invalidations.
  // Reading: "any cached analytics result, regardless of range, please
  // refetch on this event." This avoids any chance that a custom-range
  // object literal hashes differently than the one stored in the cache,
  // and keeps the invalidation surface broad enough to refresh whichever
  // range the user is currently looking at.
  useRealtimeInvalidation({
    'interest:stageChanged': [
      ['analytics', 'pipeline_funnel'],
      ['analytics', 'lead_source_attribution'],
      ['dashboard', 'kpis'],
    ],
    'client:created': [['dashboard', 'kpis']],
    'berth:statusChanged': [
      ['analytics', 'occupancy_timeline'],
      ['dashboard', 'kpis'],
    ],
  });

  return (
    <div className="space-y-6">
      <PageHeader
        title={greeting}
        eyebrow="Dashboard"
        description={`Live snapshot of ${portName} activity`}
        kpiLine={<span>{rangeLabel(range)}</span>}
        variant="gradient"
        actions={<DateRangePicker value={range} onChange={setRange} />}
      />

      {/* `items-start` is critical: without it, the right-column aside is
          stretched to match the chart column's row height, which forces
          MyRemindersRail (or any other child with `h-full`) to push later
          children out of the aside's box and into the rows below where
          ActivityFeed renders. */}
      <div className="grid gap-4 grid-cols-1 items-start xl:grid-cols-[minmax(0,1fr)_320px]">
        <div className="grid gap-4 grid-cols-1 lg:grid-cols-2">
          <WidgetErrorBoundary>
            <PipelineFunnelChart range={range} />
          </WidgetErrorBoundary>
          <WidgetErrorBoundary>
            <OccupancyTimelineChart range={range} />
          </WidgetErrorBoundary>
          <WidgetErrorBoundary>
            <RevenueBreakdownChart range={range} />
          </WidgetErrorBoundary>
          <WidgetErrorBoundary>
            <LeadSourceChart range={range} />
          </WidgetErrorBoundary>
        </div>
        <aside className="min-w-0 space-y-4">
          {/* Soft-fail tile linking to /website-analytics. Hidden if Umami
              isn't configured for this port. */}
          <WidgetErrorBoundary>
            <WebsiteGlanceTile />
          </WidgetErrorBoundary>
          <WidgetErrorBoundary>
            <MyRemindersRail />
          </WidgetErrorBoundary>
          <WidgetErrorBoundary>
            <AlertRail />
          </WidgetErrorBoundary>
        </aside>
      </div>

      <ActivityFeed />
    </div>
  );
}