// ---------------------------------------------------------------------------
// DataForm — pre-built form component wired to AnyDB insertOne
// ---------------------------------------------------------------------------
// PRE-INSTALLED. CodeWriterAgent just uses:
//   import { DataForm } from "@/components/DataForm"
//   <DataForm
//     collection="contact_messages"
//     fields={[
//       { name: 'name', label: 'Full Name', required: true },
//       { name: 'email', label: 'Email', type: 'email', required: true },
//       { name: 'message', label: 'Message', type: 'textarea', rows: 4 },
//     ]}
//     submitLabel="Send Message"
//     successMessage="Message sent! We'll get back to you soon."
//   />
// ---------------------------------------------------------------------------

import { useState } from "react";
import { useMutation } from "@/hooks/use-anydb";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { Button } from "@/components/ui/button";
import { Label } from "@/components/ui/label";
import { useToast } from "@/hooks/use-toast";
import { Loader2, CheckCircle } from "lucide-react";

interface FormField {
  name: string;
  label: string;
  type?: "text" | "email" | "tel" | "number" | "date" | "time" | "url" | "textarea" | "select";
  placeholder?: string;
  required?: boolean;
  options?: { value: string; label: string }[]; // For select type
  rows?: number; // For textarea
  min?: number;
  max?: number;
  defaultValue?: string | number;
  className?: string;
  gridCol?: number; // 1 or 2 — for grid layout
}

interface DataFormProps {
  collection: string;
  fields: FormField[];
  submitLabel?: string;
  successMessage?: string;
  onSuccess?: (data: any) => void;
  className?: string;
  layout?: "stack" | "grid"; // stack = vertical, grid = 2-col
}

export function DataForm({
  collection,
  fields,
  submitLabel = "Submit",
  successMessage = "Saved successfully!",
  onSuccess,
  className = "",
  layout = "stack",
}: DataFormProps) {
  const { toast } = useToast();
  const { mutate, loading } = useMutation(collection);
  const [submitted, setSubmitted] = useState(false);

  // Build initial form state from fields
  const initialState: Record<string, any> = {};
  fields.forEach(f => { initialState[f.name] = f.defaultValue || ""; });
  const [formData, setFormData] = useState(initialState);

  const handleChange = (name: string, value: any) => {
    setFormData(prev => ({ ...prev, [name]: value }));
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();

    // Basic validation
    for (const field of fields) {
      if (field.required && !formData[field.name]) {
        toast({
          title: "Required field",
          description: `Please fill in ${field.label}`,
          variant: "destructive",
        });
        return;
      }
      if (field.type === "email" && formData[field.name] && !formData[field.name].includes("@")) {
        toast({
          title: "Invalid email",
          description: "Please enter a valid email address",
          variant: "destructive",
        });
        return;
      }
    }

    try {
      const result = await mutate(formData);
      setSubmitted(true);
      toast({ title: "Success", description: successMessage });
      setFormData(initialState);
      onSuccess?.(result);

      // Reset submitted state after 3 seconds
      setTimeout(() => setSubmitted(false), 3000);
    } catch (err) {
      toast({
        title: "Error",
        description: "Something went wrong. Please try again.",
        variant: "destructive",
      });
    }
  };

  const renderField = (field: FormField) => {
    const id = `form-${collection}-${field.name}`;

    return (
      <div key={field.name} className={field.gridCol === 2 ? "col-span-2" : ""}>
        <Label htmlFor={id} className="text-sm font-medium mb-1.5 block">
          {field.label}
          {field.required && <span className="text-destructive ml-1">*</span>}
        </Label>

        {field.type === "textarea" ? (
          <Textarea
            id={id}
            placeholder={field.placeholder || `Enter ${field.label.toLowerCase()}...`}
            value={formData[field.name]}
            onChange={(e) => handleChange(field.name, e.target.value)}
            rows={field.rows || 4}
            className="resize-none focus-visible:ring-2 focus-visible:ring-primary"
            required={field.required}
            disabled={loading}
          />
        ) : field.type === "select" ? (
          <select
            id={id}
            value={formData[field.name]}
            onChange={(e) => handleChange(field.name, e.target.value)}
            className="flex h-12 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary focus-visible:ring-offset-2"
            required={field.required}
            disabled={loading}
          >
            <option value="">{field.placeholder || `Select ${field.label.toLowerCase()}`}</option>
            {field.options?.map(opt => (
              <option key={opt.value} value={opt.value}>{opt.label}</option>
            ))}
          </select>
        ) : (
          <Input
            id={id}
            type={field.type || "text"}
            placeholder={field.placeholder || `Enter ${field.label.toLowerCase()}`}
            value={formData[field.name]}
            onChange={(e) => handleChange(field.name, field.type === "number" ? Number(e.target.value) : e.target.value)}
            className="h-12 focus-visible:ring-2 focus-visible:ring-primary"
            required={field.required}
            min={field.min}
            max={field.max}
            disabled={loading}
          />
        )}
      </div>
    );
  };

  return (
    <form onSubmit={handleSubmit} className={className} aria-busy={loading}>
      <div className={layout === "grid" ? "grid grid-cols-2 gap-4" : "space-y-4"}>
        {fields.map(renderField)}
      </div>

      <Button
        type="submit"
        className="w-full h-12 text-base mt-6 transition-all duration-150 focus-visible:ring-2 focus-visible:ring-primary focus-visible:ring-offset-2"
        disabled={loading}
      >
        {loading ? (
          <>
            <Loader2 className="mr-2 h-4 w-4 animate-spin" />
            Saving...
          </>
        ) : submitted ? (
          <>
            <CheckCircle className="mr-2 h-4 w-4" />
            Sent!
          </>
        ) : (
          submitLabel
        )}
      </Button>
    </form>
  );
}