"use client";

import { useEffect, useState } from "react";
import { useSortable } from "@dnd-kit/sortable";
import { CSS } from "@dnd-kit/utilities";
import { GripVertical, Trash2 } from "lucide-react";

import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { cn } from "@/lib/utils";

type FormField = {
  id: string;
  label: string;
  type: string;
  required: boolean;
  placeholder?: string;
  helpText?: string;
  options?: { label: string; value: string }[];
  defaultValue?: unknown;
  mappedProperty: string | null;
  validation?: {
    min?: number;
    max?: number;
    pattern?: string;
    maxLength?: number;
  };
  conditionals?: {
    fieldId: string;
    operator: string;
    value: unknown;
    action: string;
  }[];
};

function formatTypeLabel(type: string) {
  return type
    .split("_")
    .map((w) => w.charAt(0).toUpperCase() + w.slice(1))
    .join(" ");
}

export function FormFieldCard({
  field,
  isSelected,
  onSelect,
  onChange,
  onDelete,
}: {
  field: FormField;
  isSelected: boolean;
  onSelect: () => void;
  onChange: (patch: Partial<FormField>) => void;
  onDelete: () => void;
}) {
  const {
    attributes,
    listeners,
    setNodeRef,
    transform,
    transition,
    isDragging,
  } = useSortable({ id: field.id });

  const style = {
    transform: CSS.Transform.toString(transform),
    transition,
  };

  const [editingLabel, setEditingLabel] = useState(false);
  const [labelDraft, setLabelDraft] = useState(field.label);

  useEffect(() => {
    setLabelDraft(field.label);
  }, [field.label]);

  return (
    <div
      ref={setNodeRef}
      style={style}
      className={cn(
        "flex items-stretch gap-2 rounded-lg border bg-card p-2 shadow-sm transition-shadow",
        isSelected && "ring-2 ring-ring ring-offset-2 ring-offset-background",
        isDragging && "z-10 opacity-90 shadow-md",
      )}
    >
      <button
        type="button"
        className="flex shrink-0 cursor-grab touch-none items-center rounded-md border border-transparent px-1 text-muted-foreground hover:bg-muted active:cursor-grabbing"
        aria-label="Drag to reorder"
        {...attributes}
        {...listeners}
      >
        <GripVertical className="size-4" />
      </button>

      <div
        role="button"
        tabIndex={0}
        className="min-w-0 flex-1 cursor-pointer text-left"
        onClick={onSelect}
        onKeyDown={(e) => {
          if (e.key === "Enter" || e.key === " ") {
            e.preventDefault();
            onSelect();
          }
        }}
      >
        {editingLabel ? (
          <Input
            autoFocus
            value={labelDraft}
            onChange={(e) => setLabelDraft(e.target.value)}
            onBlur={() => {
              setEditingLabel(false);
              if (labelDraft.trim() !== field.label) {
                onChange({ label: labelDraft.trim() || "Untitled" });
              }
            }}
            onKeyDown={(e) => {
              if (e.key === "Enter") (e.target as HTMLInputElement).blur();
              e.stopPropagation();
            }}
            className="h-8"
            onClick={(e) => e.stopPropagation()}
          />
        ) : (
          <button
            type="button"
            className="block w-full truncate text-left font-medium text-foreground hover:underline"
            onClick={(e) => {
              e.stopPropagation();
              setEditingLabel(true);
            }}
          >
            {field.label || "Untitled"}
          </button>
        )}
        <div className="mt-1 flex flex-wrap items-center gap-2">
          <Badge variant="secondary" className="font-normal">
            {formatTypeLabel(field.type)}
          </Badge>
          {field.required ? (
            <Badge variant="outline" className="text-xs">
              Required
            </Badge>
          ) : null}
        </div>
      </div>

      <div className="flex shrink-0 flex-col items-end justify-center gap-1">
        <label className="flex cursor-pointer items-center gap-1.5 text-xs text-muted-foreground">
          <input
            type="checkbox"
            checked={field.required}
            onChange={(e) => {
              e.stopPropagation();
              onChange({ required: e.target.checked });
            }}
            onClick={(e) => e.stopPropagation()}
            className="size-3.5 rounded border-input accent-primary"
          />
          Req.
        </label>
        <Button
          type="button"
          size="icon"
          variant="ghost"
          className="size-8 text-muted-foreground hover:text-destructive"
          aria-label="Delete field"
          onClick={(e) => {
            e.stopPropagation();
            onDelete();
          }}
        >
          <Trash2 className="size-4" />
        </Button>
      </div>
    </div>
  );
}