'use client'

import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { z } from 'zod'
import { toast } from 'sonner'
import { HardDrive, Loader2, Cloud, FolderOpen } from 'lucide-react'
import { trpc } from '@/lib/trpc/client'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Checkbox } from '@/components/ui/checkbox'
import { RadioGroup, RadioGroupItem } from '@/components/ui/radio-group'
import { Label } from '@/components/ui/label'
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form'
// Note: Storage provider cache is cleared server-side when settings are updated

const COMMON_FILE_TYPES = [
  { value: 'application/pdf', label: 'PDF Documents (.pdf)' },
  { value: 'video/mp4', label: 'MP4 Video (.mp4)' },
  { value: 'video/quicktime', label: 'QuickTime Video (.mov)' },
  { value: 'image/png', label: 'PNG Images (.png)' },
  { value: 'image/jpeg', label: 'JPEG Images (.jpg, .jpeg)' },
  { value: 'image/gif', label: 'GIF Images (.gif)' },
  { value: 'image/webp', label: 'WebP Images (.webp)' },
  { value: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', label: 'Word Documents (.docx)' },
  { value: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', label: 'Excel Spreadsheets (.xlsx)' },
  { value: 'application/vnd.openxmlformats-officedocument.presentationml.presentation', label: 'PowerPoint (.pptx)' },
]

const formSchema = z.object({
  storage_provider: z.enum(['s3', 'local']),
  local_storage_path: z.string().optional(),
  max_file_size_mb: z.string().regex(/^\d+$/, 'Must be a number'),
  avatar_max_size_mb: z.string().regex(/^\d+$/, 'Must be a number'),
  allowed_file_types: z.array(z.string()).min(1, 'Select at least one file type'),
})

type FormValues = z.infer<typeof formSchema>

interface StorageSettingsFormProps {
  settings: {
    storage_provider?: string
    local_storage_path?: string
    max_file_size_mb?: string
    avatar_max_size_mb?: string
    allowed_file_types?: string
  }
}

export function StorageSettingsForm({ settings }: StorageSettingsFormProps) {
  const utils = trpc.useUtils()

  // Parse allowed file types from JSON string
  let allowedTypes: string[] = []
  try {
    allowedTypes = settings.allowed_file_types
      ? JSON.parse(settings.allowed_file_types)
      : ['application/pdf', 'video/mp4', 'video/quicktime', 'image/png', 'image/jpeg']
  } catch {
    allowedTypes = ['application/pdf', 'video/mp4', 'video/quicktime', 'image/png', 'image/jpeg']
  }

  const form = useForm<FormValues>({
    resolver: zodResolver(formSchema),
    defaultValues: {
      storage_provider: (settings.storage_provider as 's3' | 'local') || 's3',
      local_storage_path: settings.local_storage_path || './uploads',
      max_file_size_mb: settings.max_file_size_mb || '500',
      avatar_max_size_mb: settings.avatar_max_size_mb || '5',
      allowed_file_types: allowedTypes,
    },
  })

  const storageProvider = form.watch('storage_provider')

  const updateSettings = trpc.settings.updateMultiple.useMutation({
    onSuccess: () => {
      toast.success('Storage settings saved successfully')
      utils.settings.getByCategory.invalidate({ category: 'STORAGE' })
    },
    onError: (error) => {
      toast.error(`Failed to save settings: ${error.message}`)
    },
  })

  const onSubmit = (data: FormValues) => {
    updateSettings.mutate({
      settings: [
        { key: 'storage_provider', value: data.storage_provider },
        { key: 'local_storage_path', value: data.local_storage_path || './uploads' },
        { key: 'max_file_size_mb', value: data.max_file_size_mb },
        { key: 'avatar_max_size_mb', value: data.avatar_max_size_mb },
        { key: 'allowed_file_types', value: JSON.stringify(data.allowed_file_types) },
      ],
    })
  }

  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-6">
        {/* Storage Provider Selection */}
        <FormField
          control={form.control}
          name="storage_provider"
          render={({ field }) => (
            <FormItem className="space-y-3">
              <FormLabel>Storage Provider</FormLabel>
              <FormControl>
                <RadioGroup
                  onValueChange={field.onChange}
                  defaultValue={field.value}
                  className="grid gap-4 md:grid-cols-2"
                >
                  <div className="flex items-start space-x-3 rounded-lg border p-4">
                    <RadioGroupItem value="s3" id="s3" className="mt-1" />
                    <Label htmlFor="s3" className="flex flex-col cursor-pointer">
                      <div className="flex items-center gap-2">
                        <Cloud className="h-4 w-4" />
                        <span className="font-medium">S3 / MinIO</span>
                      </div>
                      <span className="text-sm text-muted-foreground">
                        Store files in MinIO or S3-compatible storage. Recommended for production.
                      </span>
                    </Label>
                  </div>
                  <div className="flex items-start space-x-3 rounded-lg border p-4">
                    <RadioGroupItem value="local" id="local" className="mt-1" />
                    <Label htmlFor="local" className="flex flex-col cursor-pointer">
                      <div className="flex items-center gap-2">
                        <FolderOpen className="h-4 w-4" />
                        <span className="font-medium">Local Filesystem</span>
                      </div>
                      <span className="text-sm text-muted-foreground">
                        Store files on the local server. Good for development or single-server deployments.
                      </span>
                    </Label>
                  </div>
                </RadioGroup>
              </FormControl>
              <FormMessage />
            </FormItem>
          )}
        />

        {/* Local Storage Path (only shown when local is selected) */}
        {storageProvider === 'local' && (
          <FormField
            control={form.control}
            name="local_storage_path"
            render={({ field }) => (
              <FormItem>
                <FormLabel>Local Storage Path</FormLabel>
                <FormControl>
                  <Input placeholder="./uploads" {...field} />
                </FormControl>
                <FormDescription>
                  Directory path where files will be stored. Relative paths are from the app root.
                </FormDescription>
                <FormMessage />
              </FormItem>
            )}
          />
        )}

        <FormField
          control={form.control}
          name="max_file_size_mb"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Maximum File Size (MB)</FormLabel>
              <FormControl>
                <Input type="number" min="1" max="2000" placeholder="500" {...field} />
              </FormControl>
              <FormDescription>
                Maximum allowed file upload size in megabytes. Recommended: 500 MB for video uploads.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />

        <FormField
          control={form.control}
          name="avatar_max_size_mb"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Maximum Avatar/Logo Size (MB)</FormLabel>
              <FormControl>
                <Input type="number" min="1" max="50" placeholder="5" {...field} />
              </FormControl>
              <FormDescription>
                Maximum size for profile pictures and project logos.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />

        <FormField
          control={form.control}
          name="allowed_file_types"
          render={() => (
            <FormItem>
              <div className="mb-4">
                <FormLabel>Allowed File Types</FormLabel>
                <FormDescription>
                  Select which file types can be uploaded to the platform
                </FormDescription>
              </div>
              <div className="grid gap-3 md:grid-cols-2">
                {COMMON_FILE_TYPES.map((type) => (
                  <FormField
                    key={type.value}
                    control={form.control}
                    name="allowed_file_types"
                    render={({ field }) => {
                      return (
                        <FormItem
                          key={type.value}
                          className="flex items-start space-x-3 space-y-0"
                        >
                          <FormControl>
                            <Checkbox
                              checked={field.value?.includes(type.value)}
                              onCheckedChange={(checked) => {
                                return checked
                                  ? field.onChange([...field.value, type.value])
                                  : field.onChange(
                                      field.value?.filter(
                                        (value) => value !== type.value
                                      )
                                    )
                              }}
                            />
                          </FormControl>
                          <FormLabel className="cursor-pointer text-sm font-normal">
                            {type.label}
                          </FormLabel>
                        </FormItem>
                      )
                    }}
                  />
                ))}
              </div>
              <FormMessage />
            </FormItem>
          )}
        />

        {storageProvider === 's3' && (
          <div className="rounded-lg border border-muted bg-muted/50 p-4">
            <p className="text-sm text-muted-foreground">
              <strong>Note:</strong> MinIO connection settings (endpoint, bucket, credentials) are
              configured via environment variables for security. Set <code>MINIO_ENDPOINT</code> and{' '}
              <code>MINIO_PUBLIC_ENDPOINT</code> for external MinIO servers.
            </p>
          </div>
        )}

        {storageProvider === 'local' && (
          <div className="rounded-lg border border-amber-200 bg-amber-50 p-4 dark:border-amber-900 dark:bg-amber-950">
            <p className="text-sm text-amber-800 dark:text-amber-200">
              <strong>Warning:</strong> Local storage is not recommended for production deployments
              with multiple servers, as files will only be accessible from the server that uploaded them.
            </p>
          </div>
        )}

        <Button type="submit" disabled={updateSettings.isPending}>
          {updateSettings.isPending ? (
            <>
              <Loader2 className="mr-2 h-4 w-4 animate-spin" />
              Saving...
            </>
          ) : (
            <>
              <HardDrive className="mr-2 h-4 w-4" />
              Save Storage Settings
            </>
          )}
        </Button>
      </form>
    </Form>
  )
}