import { useEffect, useState } from 'react'
import { useForm, type Resolver } from 'react-hook-form'
import { zodResolver } from '@hookform/resolvers/zod'
import { CalendarClock, CreditCard, RefreshCw, Settings2 } from 'lucide-react'
import { useTranslation } from 'react-i18next'
import { toast } from 'sonner'
import { Button } from '@/components/ui/button'
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form'
import { Input } from '@/components/ui/input'
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/ui/select'
import {
  Sheet,
  SheetClose,
  SheetContent,
  SheetDescription,
  SheetFooter,
  SheetHeader,
  SheetTitle,
} from '@/components/ui/sheet'
import { Switch } from '@/components/ui/switch'
import { createPlan, updatePlan, getGroups } from '../api'
import { getDurationUnitOptions, getResetPeriodOptions } from '../constants'
import {
  getPlanFormSchema,
  PLAN_FORM_DEFAULTS,
  planToFormValues,
  formValuesToPlanPayload,
  type PlanFormValues,
} from '../lib'
import type { PlanRecord } from '../types'
import { useSubscriptions } from './subscriptions-provider'

interface Props {
  open: boolean
  onOpenChange: (open: boolean) => void
  currentRow?: PlanRecord
}

export function SubscriptionsMutateDrawer({
  open,
  onOpenChange,
  currentRow,
}: Props) {
  const { t } = useTranslation()
  const isEdit = !!currentRow?.plan?.id
  const { triggerRefresh } = useSubscriptions()
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [groupOptions, setGroupOptions] = useState<string[]>([])

  const schema = getPlanFormSchema(t)
  const form = useForm<PlanFormValues>({
    resolver: zodResolver(schema) as unknown as Resolver<PlanFormValues>,
    defaultValues: PLAN_FORM_DEFAULTS,
  })

  useEffect(() => {
    if (open) {
      if (currentRow?.plan) {
        form.reset(planToFormValues(currentRow.plan))
      } else {
        form.reset(PLAN_FORM_DEFAULTS)
      }
      getGroups()
        .then((res) => {
          if (res.success) setGroupOptions(res.data || [])
        })
        .catch(() => {})
    }
  }, [open, currentRow, form])

  const durationUnit = form.watch('duration_unit')
  const resetPeriod = form.watch('quota_reset_period')

  const onSubmit = async (values: PlanFormValues) => {
    setIsSubmitting(true)
    try {
      const payload = formValuesToPlanPayload(values)
      if (isEdit && currentRow?.plan?.id) {
        const res = await updatePlan(currentRow.plan.id, payload)
        if (res.success) {
          toast.success(t('Update succeeded'))
          onOpenChange(false)
          triggerRefresh()
        }
      } else {
        const res = await createPlan(payload)
        if (res.success) {
          toast.success(t('Create succeeded'))
          onOpenChange(false)
          triggerRefresh()
        }
      }
    } catch {
      toast.error(t('Request failed'))
    } finally {
      setIsSubmitting(false)
    }
  }

  const durationUnitOpts = getDurationUnitOptions(t)
  const resetPeriodOpts = getResetPeriodOptions(t)

  return (
    <Sheet
      open={open}
      onOpenChange={(v) => {
        onOpenChange(v)
        if (!v) {
          form.reset()
        }
      }}
    >
      <SheetContent className='flex w-full flex-col sm:max-w-[600px]'>
        <SheetHeader className='text-start'>
          <SheetTitle>
            {isEdit ? t('Update plan info') : t('Create new subscription plan')}
          </SheetTitle>
          <SheetDescription>
            {isEdit
              ? t('Modify existing subscription plan configuration')
              : t(
                  'Fill in the following info to create a new subscription plan'
                )}
          </SheetDescription>
        </SheetHeader>
        <Form {...form}>
          <form
            id='subscription-form'
            onSubmit={form.handleSubmit(onSubmit)}
            className='flex-1 space-y-6 overflow-y-auto px-4'
          >
            {/* Basic Info */}
            <div className='space-y-4'>
              <h3 className='flex items-center gap-2 text-sm font-medium'>
                <Settings2 className='h-4 w-4' />
                {t('Basic Info')}
              </h3>

              <FormField
                control={form.control}
                name='title'
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t('Plan Title')}</FormLabel>
                    <FormControl>
                      <Input {...field} placeholder={t('e.g. Basic Plan')} />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <FormField
                control={form.control}
                name='subtitle'
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>{t('Plan Subtitle')}</FormLabel>
                    <FormControl>
                      <Input
                        {...field}
                        placeholder={t('e.g. Suitable for light usage')}
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <div className='grid grid-cols-2 gap-3'>
                <FormField
                  control={form.control}
                  name='price_amount'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Actual Amount')}</FormLabel>
                      <FormControl>
                        <Input
                          {...field}
                          type='number'
                          step='0.01'
                          min={0}
                          onChange={(e) =>
                            field.onChange(parseFloat(e.target.value) || 0)
                          }
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name='total_amount'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Total Quota')}</FormLabel>
                      <FormControl>
                        <Input
                          {...field}
                          type='number'
                          min={0}
                          onChange={(e) =>
                            field.onChange(parseFloat(e.target.value) || 0)
                          }
                        />
                      </FormControl>
                      <FormDescription>
                        {t('0 means unlimited')}
                      </FormDescription>
                      <FormMessage />
                    </FormItem>
                  )}
                />
              </div>

              <div className='grid grid-cols-2 gap-3'>
                <FormField
                  control={form.control}
                  name='upgrade_group'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Upgrade Group')}</FormLabel>
                      <Select
                        onValueChange={(v) =>
                          field.onChange(v === '__none__' ? '' : v)
                        }
                        value={field.value || ''}
                      >
                        <FormControl>
                          <SelectTrigger>
                            <SelectValue placeholder={t('No Upgrade')} />
                          </SelectTrigger>
                        </FormControl>
                        <SelectContent>
                          <SelectItem value='__none__'>
                            {t('No Upgrade')}
                          </SelectItem>
                          {groupOptions.map((g) => (
                            <SelectItem key={g} value={g}>
                              {g}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name='max_purchase_per_user'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Purchase Limit')}</FormLabel>
                      <FormControl>
                        <Input
                          {...field}
                          type='number'
                          min={0}
                          onChange={(e) =>
                            field.onChange(parseInt(e.target.value, 10) || 0)
                          }
                        />
                      </FormControl>
                      <FormDescription>
                        {t('0 means unlimited')}
                      </FormDescription>
                      <FormMessage />
                    </FormItem>
                  )}
                />
              </div>

              <div className='grid grid-cols-2 gap-3'>
                <FormField
                  control={form.control}
                  name='sort_order'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Sort Order')}</FormLabel>
                      <FormControl>
                        <Input
                          {...field}
                          type='number'
                          onChange={(e) =>
                            field.onChange(parseInt(e.target.value, 10) || 0)
                          }
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name='enabled'
                  render={({ field }) => (
                    <FormItem className='flex flex-row items-center gap-2 pt-8'>
                      <FormControl>
                        <Switch
                          checked={field.value}
                          onCheckedChange={field.onChange}
                        />
                      </FormControl>
                      <FormLabel className='!mt-0'>
                        {t('Enabled Status')}
                      </FormLabel>
                    </FormItem>
                  )}
                />
              </div>
            </div>

            {/* Duration Settings */}
            <div className='space-y-4'>
              <h3 className='flex items-center gap-2 text-sm font-medium'>
                <CalendarClock className='h-4 w-4' />
                {t('Duration Settings')}
              </h3>

              <div className='grid grid-cols-2 gap-3'>
                <FormField
                  control={form.control}
                  name='duration_unit'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Duration Unit')}</FormLabel>
                      <Select
                        onValueChange={field.onChange}
                        value={field.value}
                      >
                        <FormControl>
                          <SelectTrigger>
                            <SelectValue />
                          </SelectTrigger>
                        </FormControl>
                        <SelectContent>
                          {durationUnitOpts.map((o) => (
                            <SelectItem key={o.value} value={o.value}>
                              {o.label}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                {durationUnit === 'custom' ? (
                  <FormField
                    control={form.control}
                    name='custom_seconds'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Custom Seconds')}</FormLabel>
                        <FormControl>
                          <Input
                            {...field}
                            type='number'
                            min={1}
                            onChange={(e) =>
                              field.onChange(parseInt(e.target.value, 10) || 0)
                            }
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                ) : (
                  <FormField
                    control={form.control}
                    name='duration_value'
                    render={({ field }) => (
                      <FormItem>
                        <FormLabel>{t('Duration Value')}</FormLabel>
                        <FormControl>
                          <Input
                            {...field}
                            type='number'
                            min={1}
                            onChange={(e) =>
                              field.onChange(parseInt(e.target.value, 10) || 0)
                            }
                          />
                        </FormControl>
                        <FormMessage />
                      </FormItem>
                    )}
                  />
                )}
              </div>
            </div>

            {/* Quota Reset */}
            <div className='space-y-4'>
              <h3 className='flex items-center gap-2 text-sm font-medium'>
                <RefreshCw className='h-4 w-4' />
                {t('Quota Reset')}
              </h3>

              <div className='grid grid-cols-2 gap-3'>
                <FormField
                  control={form.control}
                  name='quota_reset_period'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Reset Cycle')}</FormLabel>
                      <Select
                        onValueChange={field.onChange}
                        value={field.value}
                      >
                        <FormControl>
                          <SelectTrigger>
                            <SelectValue />
                          </SelectTrigger>
                        </FormControl>
                        <SelectContent>
                          {resetPeriodOpts.map((o) => (
                            <SelectItem key={o.value} value={o.value}>
                              {o.label}
                            </SelectItem>
                          ))}
                        </SelectContent>
                      </Select>
                      <FormMessage />
                    </FormItem>
                  )}
                />

                <FormField
                  control={form.control}
                  name='quota_reset_custom_seconds'
                  render={({ field }) => (
                    <FormItem>
                      <FormLabel>{t('Custom Seconds')}</FormLabel>
                      <FormControl>
                        <Input
                          {...field}
                          type='number'
                          min={0}
                          disabled={resetPeriod !== 'custom'}
                          onChange={(e) =>
                            field.onChange(parseInt(e.target.value, 10) || 0)
                          }
                        />
                      </FormControl>
                      <FormMessage />
                    </FormItem>
                  )}
                />
              </div>
            </div>

            {/* Payment Config */}
            <div className='space-y-4'>
              <h3 className='flex items-center gap-2 text-sm font-medium'>
                <CreditCard className='h-4 w-4' />
                {t('Third-party Payment Config')}
              </h3>

              <FormField
                control={form.control}
                name='stripe_price_id'
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Stripe Price ID</FormLabel>
                    <FormControl>
                      <Input {...field} placeholder='price_...' />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />

              <FormField
                control={form.control}
                name='creem_product_id'
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>Creem Product ID</FormLabel>
                    <FormControl>
                      <Input {...field} placeholder='prod_...' />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
            </div>
          </form>
        </Form>
        <SheetFooter className='gap-2'>
          <SheetClose asChild>
            <Button variant='outline'>{t('Close')}</Button>
          </SheetClose>
          <Button
            form='subscription-form'
            type='submit'
            disabled={isSubmitting}
          >
            {isSubmitting ? t('Saving...') : t('Save changes')}
          </Button>
        </SheetFooter>
      </SheetContent>
    </Sheet>
  )
}
