import { useState } from 'react';
import { useForm } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import * as z from 'zod';
import { entitySchemas } from '@/lib/entityValidationSchemas';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Label } from '@/components/ui/label';
import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { SlugField } from '@/components/ui/slug-field';
import { Building2, Save, X } from 'lucide-react';
import { useUserRole } from '@/hooks/useUserRole';
import { HeadquartersLocationInput } from './HeadquartersLocationInput';
import { EntityMultiImageUploader } from '@/components/upload/EntityMultiImageUploader';
import { FlexibleDateInput, type DatePrecision } from '@/components/ui/flexible-date-input';
import { useAuth } from '@/hooks/useAuth';
import { toast } from 'sonner';
import { handleError } from '@/lib/errorHandler';
import { toDateOnly, parseDateOnly, toDateWithPrecision } from '@/lib/dateUtils';
import type { UploadedImage } from '@/types/company';

// Zod output type (after transformation)
type ManufacturerFormData = z.infer<typeof entitySchemas.manufacturer>;

interface ManufacturerFormProps {
  onSubmit: (data: ManufacturerFormData) => void;
  onCancel: () => void;
  initialData?: Partial<ManufacturerFormData & {
    id?: string;
    banner_image_url?: string;
    card_image_url?: string;
  }>;
}

export function ManufacturerForm({ onSubmit, onCancel, initialData }: ManufacturerFormProps): React.JSX.Element {
  const { isModerator } = useUserRole();
  const { user } = useAuth();
  const [isSubmitting, setIsSubmitting] = useState(false);
  
  const {
    register,
    handleSubmit,
    setValue,
    watch,
    formState: { errors }
  } = useForm({
    resolver: zodResolver(entitySchemas.manufacturer),
    defaultValues: {
      name: initialData?.name || '',
      slug: initialData?.slug || '',
      company_type: 'manufacturer' as const,
      description: initialData?.description || '',
      person_type: initialData?.person_type || ('company' as const),
      website_url: initialData?.website_url || '',
      founded_year: initialData?.founded_year ? String(initialData.founded_year) : '',
      founded_date: initialData?.founded_date || (initialData?.founded_year ? `${initialData.founded_year}-01-01` : undefined),
      founded_date_precision: initialData?.founded_date_precision || (initialData?.founded_year ? ('year' as const) : ('day' as const)),
      headquarters_location: initialData?.headquarters_location || '',
      source_url: initialData?.source_url || '',
      submission_notes: initialData?.submission_notes || '',
      images: initialData?.images || { uploaded: [] }
    }
  });


  return (
    <Card>
      <CardHeader>
        <CardTitle className="flex items-center gap-2">
          <Building2 className="w-5 h-5" />
          {initialData ? 'Edit Manufacturer' : 'Create New Manufacturer'}
        </CardTitle>
      </CardHeader>
      <CardContent>
        <form onSubmit={handleSubmit(async (data) => {
          if (!user) {
            toast.error('You must be logged in to submit');
            return;
          }
          
          setIsSubmitting(true);
          try {            
            const formData = {
              ...data,
              company_type: 'manufacturer' as const,
              founded_year: data.founded_year ? parseInt(String(data.founded_year)) : undefined,
              banner_image_id: undefined,
              banner_image_url: undefined,
              card_image_id: undefined,
              card_image_url: undefined,
            };
            
            await onSubmit(formData);
            
            // Only show success toast and close if not editing through moderation queue
            if (!initialData?.id) {
              toast.success('Manufacturer submitted for review');
              onCancel();
            }
          } catch (error: unknown) {
            handleError(error, {
              action: initialData?.id ? 'Update Manufacturer' : 'Create Manufacturer',
              metadata: { companyName: data.name }
            });
            
            // Re-throw so parent can handle modal closing
            throw error;
          } finally {
            setIsSubmitting(false);
          }
        })} className="space-y-6">
          {/* Basic Information */}
          <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
            <div className="space-y-2">
              <Label htmlFor="name">Name *</Label>
              <Input
                id="name"
                {...register('name')}
                placeholder="Enter manufacturer name"
              />
              {errors.name && (
                <p className="text-sm text-destructive">{errors.name.message}</p>
              )}
            </div>

            <SlugField
              name={watch('name')}
              slug={watch('slug')}
              onSlugChange={(slug) => setValue('slug', slug)}
              isModerator={isModerator()}
            />
          </div>

          {/* Description */}
          <div className="space-y-2">
            <Label htmlFor="description">Description</Label>
            <Textarea
              id="description"
              {...register('description')}
              placeholder="Describe the manufacturer..."
              rows={3}
            />
          </div>

          {/* Person Type */}
          <div className="space-y-2">
            <Label>Entity Type *</Label>
            <RadioGroup
              value={watch('person_type')}
              onValueChange={(value) => setValue('person_type', value as 'company' | 'individual' | 'firm' | 'organization')}
              className="grid grid-cols-2 md:grid-cols-4 gap-4"
            >
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="company" id="company" />
                <Label htmlFor="company" className="cursor-pointer">Company</Label>
              </div>
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="individual" id="individual" />
                <Label htmlFor="individual" className="cursor-pointer">Individual</Label>
              </div>
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="firm" id="firm" />
                <Label htmlFor="firm" className="cursor-pointer">Firm</Label>
              </div>
              <div className="flex items-center space-x-2">
                <RadioGroupItem value="organization" id="organization" />
                <Label htmlFor="organization" className="cursor-pointer">Organization</Label>
              </div>
            </RadioGroup>
          </div>

          {/* Additional Details */}
          <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
            <FlexibleDateInput
              value={(() => {
                const dateValue = watch('founded_date');
                if (!dateValue) return undefined;
                return parseDateOnly(dateValue);
              })()}
              precision={(watch('founded_date_precision') as DatePrecision) || 'year'}
              onChange={(date, precision) => {
                setValue('founded_date', date ? toDateWithPrecision(date, precision) : undefined, { shouldValidate: true });
                setValue('founded_date_precision', precision);
              }}
              label="Founded Date"
              placeholder="Select founded date"
              disableFuture={true}
              fromYear={1800}
            />

            <div className="space-y-2">
              <Label htmlFor="headquarters_location">Headquarters Location</Label>
              <HeadquartersLocationInput
                value={watch('headquarters_location') || ''}
                onChange={(value) => setValue('headquarters_location', value)}
              />
              <p className="text-xs text-muted-foreground">
                Search OpenStreetMap for accurate location data, or manually enter location name.
              </p>
            </div>
          </div>

          {/* Website */}
          <div className="space-y-2">
            <Label htmlFor="website_url">Website URL</Label>
            <Input
              id="website_url"
              type="url"
              {...register('website_url')}
              placeholder="https://example.com"
            />
            {errors.website_url && (
              <p className="text-sm text-destructive">{errors.website_url.message}</p>
            )}
          </div>

          {/* Submission Context - For Reviewers */}
          <div className="space-y-4 border-t pt-6">
            <div className="flex items-center gap-2 mb-4">
              <Badge variant="secondary" className="text-xs">
                For Moderator Review
              </Badge>
              <p className="text-xs text-muted-foreground">
                Help reviewers verify your submission
              </p>
            </div>
            
            <div className="space-y-2">
              <Label htmlFor="source_url" className="flex items-center gap-2">
                Source URL
                <span className="text-xs text-muted-foreground font-normal">
                  (Optional)
                </span>
              </Label>
              <Input
                id="source_url"
                type="url"
                {...register('source_url')}
                placeholder="https://example.com/article"
              />
              <p className="text-xs text-muted-foreground">
                Where did you find this information? (e.g., official website, news article, press release)
              </p>
              {errors.source_url && (
                <p className="text-sm text-destructive">{errors.source_url.message}</p>
              )}
            </div>

            <div className="space-y-2">
              <Label htmlFor="submission_notes" className="flex items-center gap-2">
                Notes for Reviewers
                <span className="text-xs text-muted-foreground font-normal">
                  (Optional)
                </span>
              </Label>
              <Textarea
                id="submission_notes"
                {...register('submission_notes')}
                placeholder="Add any context to help moderators verify this information (e.g., 'Confirmed via company website', 'Founded date approximate')"
                rows={3}
                maxLength={1000}
              />
              <p className="text-xs text-muted-foreground">
                {watch('submission_notes')?.length || 0}/1000 characters
              </p>
              {errors.submission_notes && (
                <p className="text-sm text-destructive">{errors.submission_notes.message}</p>
              )}
            </div>
          </div>

          {/* Images */}
          <EntityMultiImageUploader
            mode={initialData ? 'edit' : 'create'}
            value={watch('images') || { uploaded: [] }}
            onChange={(images) => setValue('images', images)}
            entityType="manufacturer"
            entityId={initialData?.id}
            currentBannerUrl={initialData?.banner_image_url}
            currentCardUrl={initialData?.card_image_url}
          />

          {/* Actions */}
          <div className="flex gap-3 justify-end">
            <Button 
              type="button" 
              variant="outline" 
              onClick={onCancel}
              disabled={isSubmitting}
            >
              <X className="w-4 h-4 mr-2" />
              Cancel
            </Button>
            <Button 
              type="submit"
              loading={isSubmitting}
              loadingText="Saving..."
            >
              <Save className="w-4 h-4 mr-2" />
              {initialData?.id ? 'Update Manufacturer' : 'Create Manufacturer'}
            </Button>
          </div>
        </form>
      </CardContent>
    </Card>
  );
}