import { useEffect } from 'react'
import * as z from 'zod'
import { useForm } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { useTranslation } from 'react-i18next'
import { Button } from '@/components/ui/button'
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form'
import { Switch } from '@/components/ui/switch'
import { Textarea } from '@/components/ui/textarea'
import { SettingsSection } from '../components/settings-section'
import { useUpdateOption } from '../hooks/use-update-option'

const sensitiveSchema = z.object({
  CheckSensitiveEnabled: z.boolean(),
  CheckSensitiveOnPromptEnabled: z.boolean(),
  SensitiveWords: z.string().optional(),
})

type SensitiveFormValues = z.infer<typeof sensitiveSchema>

type SensitiveWordsSectionProps = {
  defaultValues: SensitiveFormValues
}

export function SensitiveWordsSection({
  defaultValues,
}: SensitiveWordsSectionProps) {
  const { t } = useTranslation()
  const updateOption = useUpdateOption()
  const form = useForm<SensitiveFormValues>({
    resolver: zodResolver(sensitiveSchema),
    defaultValues,
  })

  useEffect(() => {
    form.reset(defaultValues)
  }, [defaultValues, form])

  const onSubmit = async (values: SensitiveFormValues) => {
    const updates = Object.entries(values).filter(
      ([key, value]) =>
        value !== defaultValues[key as keyof SensitiveFormValues]
    )

    for (const [key, value] of updates) {
      await updateOption.mutateAsync({ key, value: value ?? '' })
    }
  }

  return (
    <SettingsSection
      title={t('Sensitive Words')}
      description={t('Configure keyword filtering for prompts and responses.')}
    >
      <Form {...form}>
        <form onSubmit={form.handleSubmit(onSubmit)} className='space-y-6'>
          <div className='space-y-4'>
            <FormField
              control={form.control}
              name='CheckSensitiveEnabled'
              render={({ field }) => (
                <FormItem className='flex flex-row items-center justify-between rounded-lg border p-4'>
                  <div className='space-y-0.5'>
                    <FormLabel className='text-base'>
                      {t('Enable filtering')}
                    </FormLabel>
                    <FormDescription>
                      {t(
                        'Blocks messages when sensitive keywords are detected.'
                      )}
                    </FormDescription>
                  </div>
                  <FormControl>
                    <Switch
                      checked={field.value}
                      onCheckedChange={field.onChange}
                    />
                  </FormControl>
                </FormItem>
              )}
            />

            <FormField
              control={form.control}
              name='CheckSensitiveOnPromptEnabled'
              render={({ field }) => (
                <FormItem className='flex flex-row items-center justify-between rounded-lg border p-4'>
                  <div className='space-y-0.5'>
                    <FormLabel className='text-base'>
                      {t('Inspect user prompts')}
                    </FormLabel>
                    <FormDescription>
                      {t(
                        'When enabled, prompts are scanned before reaching upstream models.'
                      )}
                    </FormDescription>
                  </div>
                  <FormControl>
                    <Switch
                      checked={field.value}
                      onCheckedChange={field.onChange}
                    />
                  </FormControl>
                </FormItem>
              )}
            />
          </div>

          <FormField
            control={form.control}
            name='SensitiveWords'
            render={({ field }) => (
              <FormItem>
                <FormLabel>{t('Blocked keywords')}</FormLabel>
                <FormControl>
                  <Textarea
                    rows={12}
                    placeholder={t('Enter one keyword per line')}
                    {...field}
                  />
                </FormControl>
                <FormDescription>
                  {t(
                    'Each line represents one keyword. Leave blank to disable the list but keep the switch states.'
                  )}
                </FormDescription>
                <FormMessage />
              </FormItem>
            )}
          />

          <Button type='submit' disabled={updateOption.isPending}>
            {updateOption.isPending
              ? t('Saving...')
              : t('Save sensitive words')}
          </Button>
        </form>
      </Form>
    </SettingsSection>
  )
}
