"use client";

import { useCallback, useState } from "react";
import { useDropzone } from "react-dropzone";
import { Upload, FileText, X, Loader2 } from "lucide-react";
import type { Case } from "@/lib/types";

interface ExtractionFormProps {
  cases: Case[];
  selectedCaseId: string;
  onCaseChange: (caseId: string) => void;
  onExtract: (file: File | null, text: string) => void;
  isLoading: boolean;
}

const inputClass =
  "w-full rounded-md border border-neutral-200 bg-white px-3 py-2 text-sm text-neutral-900 outline-none transition-colors focus:border-neutral-400 focus:ring-1 focus:ring-neutral-400";

export function ExtractionForm({
  cases,
  selectedCaseId,
  onCaseChange,
  onExtract,
  isLoading,
}: ExtractionFormProps) {
  const [file, setFile] = useState<File | null>(null);
  const [text, setText] = useState("");

  const onDrop = useCallback((acceptedFiles: File[]) => {
    if (acceptedFiles.length > 0) {
      setFile(acceptedFiles[0]);
      setText("");
    }
  }, []);

  const { getRootProps, getInputProps, isDragActive } = useDropzone({
    onDrop,
    accept: { "application/pdf": [".pdf"] },
    maxFiles: 1,
    disabled: isLoading,
  });

  function removeFile() {
    setFile(null);
  }

  function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    if (!selectedCaseId || (!file && !text.trim())) return;
    onExtract(file, text.trim());
  }

  const hasInput = file !== null || text.trim().length > 0;

  return (
    <form onSubmit={handleSubmit} className="space-y-5">
      {/* Case selector */}
      <div>
        <label
          htmlFor="case-select"
          className="mb-1.5 block text-sm font-medium text-neutral-700"
        >
          Akte
        </label>
        <select
          id="case-select"
          value={selectedCaseId}
          onChange={(e) => onCaseChange(e.target.value)}
          className={inputClass}
          disabled={isLoading}
        >
          <option value="">Akte auswählen...</option>
          {cases.map((c) => (
            <option key={c.id} value={c.id}>
              {c.case_number} - {c.title}
            </option>
          ))}
        </select>
      </div>

      {/* PDF dropzone */}
      <div>
        <label className="mb-1.5 block text-sm font-medium text-neutral-700">
          PDF hochladen
        </label>
        {file ? (
          <div className="flex items-center gap-3 rounded-md border border-neutral-200 bg-neutral-50 px-4 py-3">
            <FileText className="h-5 w-5 shrink-0 text-neutral-500" />
            <div className="min-w-0 flex-1">
              <p className="truncate text-sm font-medium text-neutral-900">
                {file.name}
              </p>
              <p className="text-xs text-neutral-500">
                {(file.size / 1024).toFixed(0)} KB
              </p>
            </div>
            <button
              type="button"
              onClick={removeFile}
              disabled={isLoading}
              className="rounded p-1 text-neutral-400 transition-colors hover:bg-neutral-200 hover:text-neutral-600"
            >
              <X className="h-4 w-4" />
            </button>
          </div>
        ) : (
          <div
            {...getRootProps()}
            className={`cursor-pointer rounded-md border-2 border-dashed px-6 py-8 text-center transition-colors ${
              isDragActive
                ? "border-neutral-500 bg-neutral-50"
                : "border-neutral-300 hover:border-neutral-400"
            } ${isLoading ? "pointer-events-none opacity-50" : ""}`}
          >
            <input {...getInputProps()} />
            <Upload className="mx-auto h-8 w-8 text-neutral-400" />
            <p className="mt-2 text-sm text-neutral-600">
              PDF hierher ziehen oder{" "}
              <span className="font-medium text-neutral-900">durchsuchen</span>
            </p>
            <p className="mt-1 text-xs text-neutral-400">Nur PDF-Dateien</p>
          </div>
        )}
      </div>

      {/* Divider */}
      <div className="flex items-center gap-3">
        <div className="h-px flex-1 bg-neutral-200" />
        <span className="text-xs text-neutral-400">oder</span>
        <div className="h-px flex-1 bg-neutral-200" />
      </div>

      {/* Text input */}
      <div>
        <label
          htmlFor="text-input"
          className="mb-1.5 block text-sm font-medium text-neutral-700"
        >
          Text eingeben
        </label>
        <textarea
          id="text-input"
          value={text}
          onChange={(e) => {
            setText(e.target.value);
            if (e.target.value.trim()) setFile(null);
          }}
          placeholder="Gerichtsschriftsatz, Beschluss oder sonstigen Text hier einfügen..."
          rows={6}
          disabled={isLoading}
          className={`${inputClass} resize-y placeholder:text-neutral-400 disabled:opacity-50`}
        />
      </div>

      {/* Submit */}
      <button
        type="submit"
        disabled={isLoading || !hasInput || !selectedCaseId}
        className="inline-flex items-center gap-2 rounded-md bg-neutral-900 px-4 py-2 text-sm font-medium text-white transition-colors hover:bg-neutral-800 disabled:cursor-not-allowed disabled:opacity-50"
      >
        {isLoading ? (
          <>
            <Loader2 className="h-4 w-4 animate-spin" />
            Analysiere...
          </>
        ) : (
          "Analysieren"
        )}
      </button>
    </form>
  );
}