/**
 * InputDialog — replaces window.prompt().
 * Usage:
 *   <InputDialog
 *     open={open} onOpenChange={setOpen}
 *     title="Rename Category"
 *     description="Enter a new name."
 *     label="Name" defaultValue={current} placeholder="e.g. Utilities"
 *     onConfirm={(value) => handleSave(value)}
 *   />
 */
import { useState, useEffect, useRef } from 'react';
import {
  Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription, DialogFooter,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';

export function InputDialog({
  open,
  onOpenChange,
  title,
  description,
  label,
  defaultValue = '',
  placeholder = '',
  confirmLabel = 'Save',
  cancelLabel  = 'Cancel',
  validate,          // optional (value: string) => string | null  (null = valid)
  onConfirm,
  loading = false,
}) {
  const [value, setValue] = useState(defaultValue);
  const [error, setError] = useState('');
  const inputRef = useRef(null);

  // Reset value when dialog opens
  useEffect(() => {
    if (open) {
      setValue(defaultValue);
      setError('');
      // autofocus + select all after animation frame
      requestAnimationFrame(() => {
        inputRef.current?.focus();
        inputRef.current?.select();
      });
    }
  }, [open, defaultValue]);

  const handleConfirm = () => {
    const trimmed = value.trim();
    if (!trimmed) { setError('This field is required.'); return; }
    if (validate) {
      const msg = validate(trimmed);
      if (msg) { setError(msg); return; }
    }
    onConfirm?.(trimmed);
  };

  const handleKeyDown = (e) => {
    if (e.key === 'Enter') { e.preventDefault(); handleConfirm(); }
    if (e.key === 'Escape') onOpenChange?.(false);
  };

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-sm">
        <DialogHeader>
          <DialogTitle>{title}</DialogTitle>
          {description && <DialogDescription>{description}</DialogDescription>}
        </DialogHeader>

        <div className="space-y-1.5">
          {label && <Label htmlFor="input-dialog-field" className="text-xs font-medium text-muted-foreground uppercase tracking-wide">{label}</Label>}
          <Input
            id="input-dialog-field"
            ref={inputRef}
            value={value}
            onChange={(e) => { setValue(e.target.value); setError(''); }}
            onKeyDown={handleKeyDown}
            placeholder={placeholder}
            className={error ? 'border-destructive focus-visible:ring-destructive' : ''}
          />
          {error && <p className="text-xs text-destructive">{error}</p>}
        </div>

        <DialogFooter>
          <Button variant="ghost" onClick={() => onOpenChange?.(false)} disabled={loading}>
            {cancelLabel}
          </Button>
          <Button onClick={handleConfirm} disabled={loading || !value.trim()}>
            {loading ? 'Saving…' : confirmLabel}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}