'use client';

import { useEffect, useId, useState } from 'react';
import { createPortal } from 'react-dom';
import { SlidersHorizontal, Tag, X } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { cn } from '@/lib/utils';

type CategoryOption = { id: string; name: string; slug: string; icon?: string };

export type JobsBrowseSort = 'newest' | 'budget-high' | 'budget-low';

export interface JobsBrowseFilters {
  categorySlug: string;
  sort: JobsBrowseSort;
}

export const defaultJobsBrowseFilters: JobsBrowseFilters = {
  categorySlug: '',
  sort: 'newest',
};

export function countActiveJobsBrowseFilters(filters: JobsBrowseFilters) {
  let count = 0;
  if (filters.categorySlug) count += 1;
  if (filters.sort !== 'newest') count += 1;
  return count;
}

const SORT_OPTIONS: { value: JobsBrowseSort; label: string }[] = [
  { value: 'newest', label: 'Newest' },
  { value: 'budget-high', label: 'Highest budget' },
  { value: 'budget-low', label: 'Lowest budget' },
];

interface JobsBrowseFilterModalProps {
  open: boolean;
  onClose: () => void;
  filters: JobsBrowseFilters;
  onChange: (filters: JobsBrowseFilters) => void;
  categories: CategoryOption[];
  resultCount: number;
}

function FilterChip({
  active,
  onClick,
  children,
}: {
  active: boolean;
  onClick: () => void;
  children: React.ReactNode;
}) {
  return (
    <button
      type="button"
      onClick={onClick}
      className={cn(
        'rounded-full px-3.5 py-2 text-sm font-semibold transition-colors',
        active ? 'bg-primary text-white' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
      )}
    >
      {children}
    </button>
  );
}

export function JobsBrowseFilterModal({
  open,
  onClose,
  filters,
  onChange,
  categories,
  resultCount,
}: JobsBrowseFilterModalProps) {
  const [mounted, setMounted] = useState(false);
  const titleId = useId();

  useEffect(() => {
    setMounted(true);
  }, []);

  useEffect(() => {
    if (!open) return;
    const onKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    document.addEventListener('keydown', onKeyDown);
    document.body.style.overflow = 'hidden';
    return () => {
      document.removeEventListener('keydown', onKeyDown);
      document.body.style.overflow = '';
    };
  }, [open, onClose]);

  const patch = (partial: Partial<JobsBrowseFilters>) => {
    onChange({ ...filters, ...partial });
  };

  if (!open || !mounted) return null;

  return createPortal(
    <div className="fixed inset-0 z-[9999] flex items-end justify-center sm:items-center sm:p-4">
      <button
        type="button"
        className="absolute inset-0 bg-slate-900/50 backdrop-blur-[1px]"
        aria-label="Close filters"
        onClick={onClose}
      />

      <div
        role="dialog"
        aria-modal="true"
        aria-labelledby={titleId}
        className={cn(
          'relative z-[10000] flex w-full max-h-[min(88dvh,100dvh)] flex-col',
          'rounded-t-2xl border border-border bg-surface shadow-2xl sm:max-w-md sm:rounded-2xl'
        )}
      >
        <div className="flex shrink-0 items-center justify-between gap-3 border-b border-border px-5 py-4">
          <div className="flex min-w-0 items-center gap-2.5">
            <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-lg bg-primary/10 text-primary">
              <SlidersHorizontal className="h-4 w-4" />
            </div>
            <div className="min-w-0">
              <h2 id={titleId} className="text-base font-bold text-slate-900">
                Filter jobs
              </h2>
              <p className="text-xs text-muted">
                {resultCount} job{resultCount !== 1 ? 's' : ''} match
              </p>
            </div>
          </div>
          <button
            type="button"
            onClick={onClose}
            className="rounded-lg p-2 text-slate-500 hover:bg-slate-100 hover:text-slate-700"
            aria-label="Close"
          >
            <X className="h-5 w-5" />
          </button>
        </div>

        <div className="flex-1 space-y-5 overflow-y-auto px-5 py-5">
          <section className="space-y-2.5">
            <h3 className="text-xs font-semibold uppercase tracking-wide text-muted">Category</h3>
            <div className="flex items-center gap-2">
              <Tag className="h-4 w-4 shrink-0 text-slate-400" />
              <select
                value={filters.categorySlug}
                onChange={(e) => patch({ categorySlug: e.target.value })}
                className="form-select h-11 w-full text-sm"
              >
                <option value="">All categories</option>
                {categories.map((cat) => (
                  <option key={cat.id} value={cat.slug}>
                    {cat.icon ? `${cat.icon} ` : ''}
                    {cat.name}
                  </option>
                ))}
              </select>
            </div>
          </section>

          <section className="space-y-2.5">
            <h3 className="text-xs font-semibold uppercase tracking-wide text-muted">Sort by</h3>
            <div className="flex flex-wrap gap-2">
              {SORT_OPTIONS.map((option) => (
                <FilterChip
                  key={option.value}
                  active={filters.sort === option.value}
                  onClick={() => patch({ sort: option.value })}
                >
                  {option.label}
                </FilterChip>
              ))}
            </div>
          </section>
        </div>

        <div className="flex shrink-0 gap-2 border-t border-border px-5 py-4">
          <Button
            type="button"
            variant="outline"
            className="flex-1"
            onClick={() => onChange(defaultJobsBrowseFilters)}
          >
            Reset
          </Button>
          <Button type="button" className="flex-1" onClick={onClose}>
            Done
          </Button>
        </div>
      </div>
    </div>,
    document.body
  );
}

export function JobsBrowseFilterButton({
  activeCount,
  onClick,
}: {
  activeCount: number;
  onClick: () => void;
}) {
  return (
    <Button type="button" variant="outline" size="sm" onClick={onClick} className="gap-1.5 shrink-0">
      <SlidersHorizontal className="h-3.5 w-3.5" />
      Filters
      {activeCount > 0 ? (
        <span className="flex h-5 min-w-5 items-center justify-center rounded-full bg-primary px-1.5 text-[10px] font-bold text-white">
          {activeCount}
        </span>
      ) : null}
    </Button>
  );
}