/**
 * Form Components Demo
 * 
 * This component demonstrates how to use the new reusable form components.
 * It shows examples of all the form field types and layout components.
 */

import React from 'react';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import * as z from 'zod';
import { Button } from '@/components/ui/button';
import { Card } from '@/components/ui/card';
import {
  FormField,
  FormSelect,
  FormCheckbox,
  FormRadio,
  FormDatePicker,
  FormSection,
  FormGrid,
  FormGridItem,
  SelectOption,
  CheckboxOption,
  RadioOption,
} from './index';

// =============================================================================
// SCHEMA
// =============================================================================

const demoFormSchema = z.object({
  title: z.string().min(1, 'Title is required'),
  description: z.string().min(10, 'Description must be at least 10 characters'),
  category: z.string().min(1, 'Category is required'),
  priority: z.string().min(1, 'Priority is required'),
  tags: z.array(z.string()).min(1, 'At least one tag is required'),
  status: z.string().min(1, 'Status is required'),
  dueDate: z.date().optional(),
  isPublic: z.boolean().default(false),
  notifications: z.array(z.string()).default([]),
});

type DemoFormData = z.infer<typeof demoFormSchema>;

// =============================================================================
// OPTIONS DATA
// =============================================================================

const categoryOptions: SelectOption[] = [
  { value: 'feature', label: 'Feature Request' },
  { value: 'bug', label: 'Bug Report' },
  { value: 'improvement', label: 'Improvement' },
  { value: 'documentation', label: 'Documentation' },
];

const priorityOptions: RadioOption[] = [
  { value: 'low', label: 'Low' },
  { value: 'medium', label: 'Medium' },
  { value: 'high', label: 'High' },
  { value: 'urgent', label: 'Urgent' },
];

const tagOptions: CheckboxOption[] = [
  { value: 'frontend', label: 'Frontend' },
  { value: 'backend', label: 'Backend' },
  { value: 'ui', label: 'UI/UX' },
  { value: 'database', label: 'Database' },
  { value: 'security', label: 'Security' },
  { value: 'performance', label: 'Performance' },
];

const statusOptions: SelectOption[] = [
  { value: 'draft', label: 'Draft' },
  { value: 'in-progress', label: 'In Progress' },
  { value: 'review', label: 'Under Review' },
  { value: 'completed', label: 'Completed' },
];

const notificationOptions: CheckboxOption[] = [
  { value: 'email', label: 'Email Notifications' },
  { value: 'push', label: 'Push Notifications' },
  { value: 'sms', label: 'SMS Notifications' },
];

// =============================================================================
// COMPONENT
// =============================================================================

export function FormComponentsDemo() {
  const form = useForm<DemoFormData>({
    resolver: zodResolver(demoFormSchema),
    defaultValues: {
      title: '',
      description: '',
      category: '',
      priority: 'medium',
      tags: [],
      status: 'draft',
      dueDate: undefined,
      isPublic: false,
      notifications: ['email'],
    },
  });

  const onSubmit = (data: DemoFormData) => {
    console.log('Form submitted:', data);
    alert('Form submitted! Check console for data.');
  };

  return (
    <div className="max-w-4xl mx-auto p-6 space-y-6">
      <div className="text-center">
        <h1 className="text-3xl font-bold mb-2">Form Components Demo</h1>
        <p className="text-muted-foreground">
          Examples of using the new reusable form components
        </p>
      </div>

      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-6">
        {/* Basic Information Section */}
        <FormSection
          title="Basic Information"
          description="Enter the basic details for your item"
          variant="default"
        >
          <FormGrid cols={1} md={2} gap="md">
            <FormGridItem>
              <FormField
                control={form.control}
                name="title"
                label="Title"
                placeholder="Enter a descriptive title"
                required
                validation={{
                  required: 'Title is required',
                  minLength: { value: 3, message: 'Title must be at least 3 characters' },
                }}
              />
            </FormGridItem>

            <FormGridItem>
              <FormSelect
                control={form.control}
                name="category"
                label="Category"
                placeholder="Select a category"
                options={categoryOptions}
                required
              />
            </FormGridItem>

            <FormGridItem span={2}>
              <FormField
                control={form.control}
                name="description"
                label="Description"
                placeholder="Provide a detailed description"
                fieldType="textarea"
                required
                validation={{
                  minLength: { value: 10, message: 'Description must be at least 10 characters' },
                }}
              />
            </FormGridItem>
          </FormGrid>
        </FormSection>

        {/* Priority and Status Section */}
        <FormSection
          title="Priority & Status"
          description="Set the priority level and current status"
          variant="bordered"
        >
          <FormGrid cols={1} md={2} gap="lg">
            <FormGridItem>
              <FormRadio
                control={form.control}
                name="priority"
                label="Priority Level"
                options={priorityOptions}
                required
                layout="vertical"
              />
            </FormGridItem>

            <FormGridItem>
              <FormSelect
                control={form.control}
                name="status"
                label="Status"
                placeholder="Select current status"
                options={statusOptions}
                required
              />
            </FormGridItem>
          </FormGrid>
        </FormSection>

        {/* Tags and Settings Section */}
        <FormSection
          title="Tags & Settings"
          description="Add relevant tags and configure settings"
          variant="minimal"
          collapsible
          defaultExpanded={false}
        >
          <FormGrid cols={1} md={2} gap="md">
            <FormGridItem>
              <FormCheckbox
                control={form.control}
                name="tags"
                label="Tags"
                options={tagOptions}
                required
                layout="vertical"
                columns={2}
              />
            </FormGridItem>

            <FormGridItem>
              <FormDatePicker
                control={form.control}
                name="dueDate"
                label="Due Date"
                placeholder="Select due date"
                mode="single"
              />

              <div className="mt-4">
                <FormCheckbox
                  control={form.control}
                  name="isPublic"
                  label="Make this item public"
                  single
                />
              </div>

              <div className="mt-4">
                <FormCheckbox
                  control={form.control}
                  name="notifications"
                  label="Notification Preferences"
                  options={notificationOptions}
                  layout="vertical"
                />
              </div>
            </FormGridItem>
          </FormGrid>
        </FormSection>

        {/* Form Actions */}
        <Card className="p-4">
          <div className="flex justify-end gap-3">
            <Button
              type="button"
              variant="outline"
              onClick={() => form.reset()}
            >
              Reset Form
            </Button>
            <Button type="submit">
              Submit Form
            </Button>
          </div>
        </Card>
      </form>

      {/* Form Data Display */}
      <Card className="p-4">
        <h3 className="text-lg font-semibold mb-3">Current Form Data</h3>
        <pre className="bg-muted p-3 rounded text-sm overflow-auto">
          {JSON.stringify(form.watch(), null, 2)}
        </pre>
      </Card>
    </div>
  );
}

export default FormComponentsDemo;