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import { useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
import { Checkbox } from "@/components/ui/checkbox";
import { Search, Loader2 } from "lucide-react";
import { type SearchRequest } from "@shared/schema";

interface SearchInterfaceProps {
  onSearch: (request: SearchRequest) => void;
  isLoading?: boolean;
}

export default function SearchInterface({ onSearch, isLoading }: SearchInterfaceProps) {
  const [query, setQuery] = useState("");
  const [searchType, setSearchType] = useState<"semantic" | "keyword" | "hybrid">("semantic");
  const [sourceTypes, setSourceTypes] = useState<string[]>(["pdf", "web", "academic", "code"]);

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    if (!query.trim()) return;

    onSearch({
      query: query.trim(),
      searchType,
      filters: {
        sourceTypes: sourceTypes.length > 0 ? sourceTypes : undefined,
      },
      limit: 10,
      offset: 0,
    });
  };

  const handleSourceTypeChange = (sourceType: string, checked: boolean) => {
    setSourceTypes(prev => 
      checked 
        ? [...prev, sourceType]
        : prev.filter(type => type !== sourceType)
    );
  };

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === "Enter" && !e.shiftKey) {
      e.preventDefault();
      handleSubmit(e);
    } else if (e.key === "Escape") {
      setQuery("");
    }
  };

  return (
    <div className="bg-white dark:bg-slate-800 rounded-xl shadow-sm border border-slate-200 dark:border-slate-700 p-6 mb-6">
      <form onSubmit={handleSubmit}>
        <div className="flex flex-col lg:flex-row gap-4">
          <div className="flex-1">
            <Label htmlFor="knowledge-search" className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">
              Search Knowledge Base
            </Label>
            <div className="relative">
              <Input
                id="knowledge-search"
                type="text"
                placeholder="Enter your query to find relevant documents... (Press Enter to search, Esc to clear)"
                value={query}
                onChange={(e) => setQuery(e.target.value)}
                onKeyDown={handleKeyDown}
                className="pl-11 focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                disabled={isLoading}
                aria-label="Search knowledge base"
              />
              <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-slate-400 w-4 h-4" />
            </div>
          </div>
          
          <div className="lg:w-auto">
            <Label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">
              Search Type
            </Label>
            <Select value={searchType} onValueChange={(value: any) => setSearchType(value)}>
              <SelectTrigger className="w-full lg:w-40">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                <SelectItem value="semantic">Semantic Search</SelectItem>
                <SelectItem value="keyword">Keyword Search</SelectItem>
                <SelectItem value="hybrid">Hybrid Search</SelectItem>
              </SelectContent>
            </Select>
          </div>
          
          <div className="lg:w-auto flex items-end">
            <Button 
              type="submit" 
              disabled={!query.trim() || isLoading}
              className="px-6 py-3 bg-blue-600 hover:bg-blue-700 focus:ring-2 focus:ring-blue-600 focus:ring-offset-2"
              aria-label={isLoading ? "Searching knowledge base" : "Search knowledge base"}
            >
              {isLoading ? (
                <>
                  <Loader2 className="w-4 h-4 mr-2 animate-spin" aria-hidden="true" />
                  Searching...
                </>
              ) : (
                <>
                  <Search className="w-4 h-4 mr-2" aria-hidden="true" />
                  Search
                </>
              )}
            </Button>
          </div>
        </div>

        {/* Search Filters */}
        <div className="mt-4 pt-4 border-t border-slate-200 dark:border-slate-700">
          <div className="flex flex-wrap gap-6">
            {[
              { id: "pdf", label: "PDFs" },
              { id: "web", label: "Web Pages" },
              { id: "academic", label: "Academic Papers" },
              { id: "code", label: "Code Repositories" }
            ].map(({ id, label }) => (
              <div key={id} className="flex items-center space-x-2">
                <Checkbox
                  id={`filter-${id}`}
                  checked={sourceTypes.includes(id)}
                  onCheckedChange={(checked) => handleSourceTypeChange(id, !!checked)}
                />
                <Label 
                  htmlFor={`filter-${id}`} 
                  className="text-sm text-slate-600 dark:text-slate-400 cursor-pointer"
                >
                  {label}
                </Label>
              </div>
            ))}
          </div>
        </div>
      </form>

      {/* AI Development Tools */}
      <div className="mt-4 pt-4 border-t border-slate-200 dark:border-slate-700">
        <div className="flex flex-col sm:flex-row justify-between items-start sm:items-center gap-3">
          <div>
            <h3 className="text-sm font-medium text-slate-700 dark:text-slate-300">AI Development Tools</h3>
            <p className="text-xs text-slate-500 dark:text-slate-400">Access external AI platforms and services</p>
          </div>
          <div className="flex flex-wrap gap-2">
            <Button
              type="button"
              variant="outline"
              size="sm"
              onClick={() => window.open('https://studio.nebius.com/', '_blank')}
              className="text-xs hover:bg-blue-50 hover:border-blue-300 dark:hover:bg-blue-900/20"
            >
              πŸš€ Nebius Studio
            </Button>
            <Button
              type="button"
              variant="outline"
              size="sm"
              onClick={() => window.open('https://platform.openai.com/playground', '_blank')}
              className="text-xs hover:bg-green-50 hover:border-green-300 dark:hover:bg-green-900/20"
            >
              πŸ€– OpenAI Playground
            </Button>
            <Button
              type="button"
              variant="outline"
              size="sm"
              onClick={() => window.open('https://huggingface.co/spaces', '_blank')}
              className="text-xs hover:bg-orange-50 hover:border-orange-300 dark:hover:bg-orange-900/20"
            >
              πŸ€— HuggingFace Spaces
            </Button>
          </div>
        </div>
      </div>
    </div>
  );
}