'use client';

import { useState } from 'react';
import { Check, ChevronsUpDown } from 'lucide-react';
import { useQuery } from '@tanstack/react-query';

import { Button } from '@/components/ui/button';
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
} from '@/components/ui/command';
import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
import { useDebounce } from '@/hooks/use-debounce';
import { apiFetch } from '@/lib/api/client';
import { stageLabelFor } from '@/lib/constants';
import { cn } from '@/lib/utils';

interface InterestOption {
  id: string;
  clientId: string;
  clientName?: string;
  pipelineStage?: string;
  // Some list endpoints surface the linked client inline; we display whatever's
  // available with a fallback to a short id.
}

interface InterestPickerProps {
  value: string | null;
  onChange: (interestId: string | null) => void;
  placeholder?: string;
  disabled?: boolean;
}

export function InterestPicker({
  value,
  onChange,
  placeholder = 'Select interest...',
  disabled,
}: InterestPickerProps) {
  const [open, setOpen] = useState(false);
  const [search, setSearch] = useState('');
  const debounced = useDebounce(search, 300);

  const { data } = useQuery<{ data: InterestOption[] }>({
    queryKey: ['interest-picker', debounced],
    queryFn: () =>
      apiFetch(
        `/api/v1/interests?search=${encodeURIComponent(debounced)}&page=1&limit=10&order=desc&includeArchived=false`,
      ),
    enabled: open,
  });

  const options = data?.data ?? [];

  const selectedLabel = (() => {
    if (!value) return placeholder;
    const match = options.find((o) => o.id === value);
    if (!match) return `Interest ${value.slice(0, 8)}`;
    if (match.clientName) return `${match.clientName} - ${stageLabelFor(match.pipelineStage)}`;
    return `Interest ${match.id.slice(0, 8)}`;
  })();

  return (
    <Popover open={open} onOpenChange={setOpen} modal>
      <PopoverTrigger asChild>
        <Button
          variant="outline"
          role="combobox"
          disabled={disabled}
          className={cn('w-full justify-between', !value && 'text-muted-foreground')}
        >
          <span className="truncate">{selectedLabel}</span>
          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" aria-hidden />
        </Button>
      </PopoverTrigger>
      <PopoverContent className="w-[320px] p-0" align="start">
        <Command shouldFilter={false}>
          <CommandInput
            placeholder="Search by client name…"
            value={search}
            onValueChange={setSearch}
          />
          <CommandList>
            <CommandEmpty>No interests found.</CommandEmpty>
            <CommandGroup>
              {options.map((i) => (
                <CommandItem
                  key={i.id}
                  value={i.id}
                  onSelect={() => {
                    onChange(i.id);
                    setOpen(false);
                  }}
                >
                  <Check
                    className={cn('mr-2 h-4 w-4', value === i.id ? 'opacity-100' : 'opacity-0')}
                  />
                  <span className="truncate">
                    {i.clientName ?? `Interest ${i.id.slice(0, 8)}`}
                    {i.pipelineStage ? (
                      <span className="ml-2 text-xs text-muted-foreground">{i.pipelineStage}</span>
                    ) : null}
                  </span>
                </CommandItem>
              ))}
            </CommandGroup>
          </CommandList>
        </Command>
      </PopoverContent>
    </Popover>
  );
}