import { useState, useRef } from 'react';
import { apiPost, apiUpload } from '../lib/api';

// Per-table create form definitions
const CREATE_FORMS = {
  words: {
    title: 'Neues Wort',
    fields: [
      { key: 'titel_de', label: 'Titel DE', type: 'text', required: true, placeholder: 'z.B. Apfel' },
      { key: 'titel_en', label: 'Titel EN', type: 'text', required: false, placeholder: 'z.B. Apple' },
      { key: 'titel_sv', label: 'Titel SV', type: 'text', required: false, placeholder: 'z.B. Äpple' },
      { key: 'difficulty_level', label: 'Schwierigkeitsgrad', type: 'number', required: false, min: 1, max: 10 },
    ],
  },
  pictures: {
    title: 'Neues Bild',
    fields: [
      { key: 'design', label: 'Design', type: 'text', required: true, placeholder: 'z.B. red apple on white background' },
    ],
    hasImageUpload: true,
  },
};

export function hasCreateForm(tableKey) {
  return !!CREATE_FORMS[tableKey];
}

function FieldInput({ field, value, onChange }) {
  if (field.type === 'number') {
    return (
      <input
        type="number"
        value={value ?? ''}
        min={field.min}
        max={field.max}
        required={field.required}
        onChange={e => onChange(e.target.value === '' ? null : Number(e.target.value))}
        placeholder={field.placeholder}
        className="w-full border border-slate-300 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-400"
      />
    );
  }
  return (
    <input
      type="text"
      value={value ?? ''}
      required={field.required}
      onChange={e => onChange(e.target.value)}
      placeholder={field.placeholder}
      className="w-full border border-slate-300 rounded-lg px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-indigo-400"
    />
  );
}

export default function CreateModal({ tableKey, meta, onClose, onCreated }) {
  const formDef = CREATE_FORMS[tableKey];
  const [values, setValues] = useState({});
  const [file, setFile] = useState(null);
  const [preview, setPreview] = useState(null);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState('');
  const fileRef = useRef();

  if (!formDef) return null;

  function handleFileChange(e) {
    const f = e.target.files[0];
    if (!f) return;
    setFile(f);
    const url = URL.createObjectURL(f);
    setPreview(url);
  }

  async function handleSubmit(e) {
    e.preventDefault();
    setError('');
    setSaving(true);
    try {
      // Build payload — skip nulls/empty strings for optional fields
      const body = {};
      formDef.fields.forEach(f => {
        if (values[f.key] != null && values[f.key] !== '') {
          body[f.key] = values[f.key];
        }
      });

      // Step 1: Create record
      const created = await apiPost(meta.endpoint, body);

      // Step 2: Upload image if provided
      let final = created;
      if (formDef.hasImageUpload && file) {
        const fd = new FormData();
        fd.append('file', file);
        final = await apiUpload(`${meta.endpoint}/${created.id}/upload`, fd);
      }

      onCreated(final);
      onClose();
    } catch (err) {
      setError(err.message);
    } finally {
      setSaving(false);
    }
  }

  return (
    <div className="fixed inset-0 z-50 flex items-start justify-center bg-black/40 backdrop-blur-sm p-4 overflow-y-auto">
      <div className="bg-white rounded-2xl shadow-2xl w-full max-w-md my-8">
        {/* Header */}
        <div className="flex items-center justify-between px-6 py-4 border-b border-slate-200">
          <div>
            <span className="text-xl mr-2">{meta.icon}</span>
            <span className="font-semibold text-slate-800">{formDef.title}</span>
          </div>
          <button
            onClick={onClose}
            className="text-slate-400 hover:text-slate-600 text-2xl leading-none"
          >
            ×
          </button>
        </div>

        {/* Form */}
        <form onSubmit={handleSubmit}>
          <div className="px-6 py-5 space-y-4">
            {formDef.fields.map(field => (
              <div key={field.key}>
                <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">
                  {field.label}
                  {field.required && <span className="text-red-500 ml-1">*</span>}
                </label>
                <FieldInput
                  field={field}
                  value={values[field.key]}
                  onChange={val => setValues(prev => ({ ...prev, [field.key]: val }))}
                />
              </div>
            ))}

            {formDef.hasImageUpload && (
              <div>
                <label className="block text-xs font-semibold text-slate-500 uppercase tracking-wide mb-1">
                  Bild hochladen
                </label>
                <div
                  onClick={() => fileRef.current?.click()}
                  className="border-2 border-dashed border-slate-300 rounded-xl p-4 text-center cursor-pointer hover:border-indigo-400 hover:bg-indigo-50 transition-colors"
                >
                  {preview ? (
                    <div className="space-y-2">
                      <img
                        src={preview}
                        alt="Vorschau"
                        className="mx-auto max-h-32 rounded-lg object-contain"
                      />
                      <p className="text-xs text-slate-500">{file.name}</p>
                    </div>
                  ) : (
                    <div className="space-y-1">
                      <div className="text-3xl">🖼️</div>
                      <p className="text-sm text-slate-500">Klicken zum Auswählen</p>
                      <p className="text-xs text-slate-400">JPG, PNG, WebP · max 20 MB</p>
                    </div>
                  )}
                </div>
                <input
                  ref={fileRef}
                  type="file"
                  accept="image/*"
                  onChange={handleFileChange}
                  className="hidden"
                />
              </div>
            )}

            {error && (
              <div className="bg-red-50 text-red-700 text-sm rounded-lg px-3 py-2">{error}</div>
            )}
          </div>

          {/* Footer */}
          <div className="px-6 py-4 border-t border-slate-200 flex justify-end gap-2">
            <button
              type="button"
              onClick={onClose}
              className="px-4 py-2 text-sm text-slate-600 hover:text-slate-800 border border-slate-300 rounded-lg transition-colors"
            >
              Abbrechen
            </button>
            <button
              type="submit"
              disabled={saving}
              className="px-4 py-2 text-sm bg-indigo-600 hover:bg-indigo-700 disabled:opacity-40 text-white font-medium rounded-lg transition-colors"
            >
              {saving ? 'Anlegen…' : 'Anlegen'}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}