/* ActiveEngineers — today's engineers grouped by working vs PTO.
 *
 * Top section: engineers with billable/work time entries today.  Each row's
 * ticket count is a button that opens a dialog listing the specific tickets
 * they logged time against (and hours per ticket).
 *
 * Bottom section: collapsible list of engineers whose only time today is on a
 * PTO/Vacation allocation code.  Empty when nobody is out. */

'use client';

import { useState } from 'react';
import { Activity, ChevronDown, Palmtree } from 'lucide-react';
import { EmptyState } from '@/components/ui/empty-state';
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
} from '@/components/ui/dialog';
import {
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
} from '@/components/ui/collapsible';
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from '@/components/ui/popover';
import { Badge } from '@/components/ui/badge';
import { cn } from '@/lib/utils';

interface Ticket {
  id: string;
  ticketNumber: string | null;
  title: string | null;
  description: string | null;
  statusLabel: string | null;
  hours: number;
}

interface Engineer {
  resourceId: string;
  name: string;
  hours: number;
  ticketsTouched: number;
  tickets: Ticket[];
  isPto: boolean;
  ptoNote: string | null;
}

interface ActiveEngineersProps {
  working: Engineer[];
  pto: Engineer[];
}

export function ActiveEngineers({ working, pto }: ActiveEngineersProps) {
  const [ticketsFor, setTicketsFor] = useState<Engineer | null>(null);
  const [ptoOpen, setPtoOpen] = useState(false);

  if (working.length === 0 && pto.length === 0) {
    return (
      <EmptyState
        icon={Activity}
        title="No time logged today"
        description="Engineers will appear here as they post time entries."
        size="sm"
      />
    );
  }

  const max = working.reduce((m, e) => Math.max(m, e.hours), 0) || 1;
  const totalHours = working.reduce((s, e) => s + e.hours, 0);
  const totalTickets = working.reduce((s, e) => s + e.ticketsTouched, 0);

  return (
    <div className="space-y-3">
      {working.length === 0 ? (
        <div className="text-xs text-muted-foreground py-2">
          No working time logged yet today.
        </div>
      ) : (
        <div className="space-y-1">
          {working.map((e) => {
            const pct = (e.hours / max) * 100;
            return (
              <div
                key={e.resourceId}
                className="grid grid-cols-[1fr_auto] items-center gap-3 py-1"
              >
                <div className="min-w-0">
                  <div className="text-sm font-medium truncate">{e.name}</div>
                  <div className="relative h-1 w-full bg-muted rounded-sm mt-1 overflow-hidden">
                    <div
                      className="absolute inset-y-0 left-0 bg-primary/70"
                      style={{ width: `${pct}%` }}
                    />
                  </div>
                </div>
                <div className="text-right shrink-0">
                  <div className="num text-sm">{e.hours.toFixed(1)}h</div>
                  <button
                    type="button"
                    onClick={() => setTicketsFor(e)}
                    disabled={e.ticketsTouched === 0}
                    className={cn(
                      'text-xs text-muted-foreground',
                      e.ticketsTouched > 0
                        ? 'hover:text-foreground hover:underline cursor-pointer'
                        : 'cursor-default',
                    )}
                  >
                    <span className="num">{e.ticketsTouched}</span>{' '}
                    ticket{e.ticketsTouched === 1 ? '' : 's'}
                  </button>
                </div>
              </div>
            );
          })}
          <div className="border-t pt-2 mt-2 flex justify-between text-xs text-muted-foreground">
            <span>Total today</span>
            <span>
              <span className="num">{totalHours.toFixed(1)}h</span>{' '}
              across <span className="num">{totalTickets}</span>{' '}
              ticket{totalTickets === 1 ? '' : 's'}
            </span>
          </div>
        </div>
      )}

      {pto.length > 0 && (
        <Collapsible open={ptoOpen} onOpenChange={setPtoOpen}>
          <CollapsibleTrigger
            className={cn(
              'flex w-full items-center justify-between gap-2 rounded-md border bg-muted/40',
              'px-2 py-1.5 text-xs text-muted-foreground hover:bg-muted',
            )}
          >
            <span className="flex items-center gap-1.5">
              <Palmtree className="h-3.5 w-3.5" />
              <span>
                <span className="num">{pto.length}</span> on PTO / Vacation
              </span>
            </span>
            <ChevronDown
              className={cn(
                'h-3.5 w-3.5 transition-transform',
                ptoOpen && 'rotate-180',
              )}
            />
          </CollapsibleTrigger>
          <CollapsibleContent className="pt-2">
            <ul className="space-y-1">
              {pto.map((e) => (
                <li
                  key={e.resourceId}
                  className="flex items-center justify-between gap-3 text-sm py-0.5"
                >
                  <span className="truncate">{e.name}</span>
                  {e.ptoNote ? (
                    <span
                      className="text-xs text-muted-foreground truncate max-w-[60%]"
                      title={e.ptoNote}
                    >
                      {e.ptoNote}
                    </span>
                  ) : null}
                </li>
              ))}
            </ul>
          </CollapsibleContent>
        </Collapsible>
      )}

      <Dialog open={!!ticketsFor} onOpenChange={(open) => !open && setTicketsFor(null)}>
        <DialogContent className="max-w-md">
          <DialogHeader>
            <DialogTitle>{ticketsFor?.name} · today</DialogTitle>
            <DialogDescription>
              {ticketsFor
                ? `${ticketsFor.hours.toFixed(1)}h across ${ticketsFor.ticketsTouched} ticket${
                    ticketsFor.ticketsTouched === 1 ? '' : 's'
                  }`
                : ''}
            </DialogDescription>
          </DialogHeader>
          <ul className="divide-y max-h-[60vh] overflow-y-auto">
            {ticketsFor?.tickets.map((t) => (
              <TicketRow key={t.id} ticket={t} />
            ))}
          </ul>
        </DialogContent>
      </Dialog>
    </div>
  );
}

/* Single ticket row inside the per-engineer dialog.  Hovering anywhere on the
 * row reveals a popover with the ticket's current status and description. */
function TicketRow({ ticket: t }: { ticket: Ticket }) {
  const [open, setOpen] = useState(false);
  const hasHoverDetail = !!(t.description || t.statusLabel);

  const row = (
    <li
      className="py-2 flex items-start justify-between gap-3"
      onMouseEnter={hasHoverDetail ? () => setOpen(true) : undefined}
      onMouseLeave={hasHoverDetail ? () => setOpen(false) : undefined}
    >
      <div className="min-w-0">
        <a
          href={`https://ww1.autotask.net/Mvc/ServiceDesk/TicketDetail.mvc?workspace=False&ids%5B0%5D=${t.id}&ticketId=${t.id}`}
          target="_blank"
          rel="noopener noreferrer"
          className="text-sm font-medium hover:underline"
        >
          {t.ticketNumber ?? `#${t.id}`}
        </a>
        {t.title ? (
          <div className="text-xs text-muted-foreground truncate">{t.title}</div>
        ) : null}
      </div>
      <span className="num text-sm shrink-0">{t.hours.toFixed(2)}h</span>
    </li>
  );

  if (!hasHoverDetail) return row;

  return (
    <Popover open={open} onOpenChange={setOpen}>
      <PopoverTrigger asChild>{row}</PopoverTrigger>
      <PopoverContent
        side="left"
        align="start"
        sideOffset={8}
        className="w-80"
        onOpenAutoFocus={(e) => e.preventDefault()}
      >
        <div className="space-y-2">
          {t.statusLabel ? (
            <div className="flex items-center gap-2">
              <span className="text-xs text-muted-foreground">Status</span>
              <Badge variant="secondary" className="text-xs">
                {t.statusLabel}
              </Badge>
            </div>
          ) : null}
          {t.description ? (
            <div>
              <div className="text-xs text-muted-foreground mb-1">Description</div>
              <p className="text-sm whitespace-pre-wrap break-words max-h-48 overflow-y-auto">
                {t.description}
              </p>
            </div>
          ) : (
            <div className="text-xs text-muted-foreground italic">
              No description on this ticket.
            </div>
          )}
        </div>
      </PopoverContent>
    </Popover>
  );
}