// React Imports
import { useState, useEffect } from 'react'

// MUI Imports
import Button from '@mui/material/Button'
import Drawer from '@mui/material/Drawer'
import IconButton from '@mui/material/IconButton'
import MenuItem from '@mui/material/MenuItem'
import Typography from '@mui/material/Typography'
import Divider from '@mui/material/Divider'
import Grid from '@mui/material/Grid2'
import Box from '@mui/material/Box'
import Switch from '@mui/material/Switch'
import FormControlLabel from '@mui/material/FormControlLabel'
import Chip from '@mui/material/Chip'
import InputAdornment from '@mui/material/InputAdornment'
import Avatar from '@mui/material/Avatar'
import Card from '@mui/material/Card'
import CardContent from '@mui/material/CardContent'
import FormHelperText from '@mui/material/FormHelperText'

// Third-party Imports
import { useForm, Controller } from 'react-hook-form'

// Component Imports
import CustomTextField from '@core/components/mui/TextField'

// Types
export interface RewardCatalogType {
  id: string
  name: string
  description?: string
  pointCost: number
  stock?: number
  isActive: boolean
  validUntil?: Date
  imageUrl?: string
  createdAt: Date
  updatedAt: Date
}

export interface RewardRequest {
  name: string
  description?: string
  pointCost: number
  stock?: number
  isActive: boolean
  validUntil?: Date
  imageUrl?: string
  category?: string
  terms?: string
}

type Props = {
  open: boolean
  handleClose: () => void
  data?: RewardCatalogType // Data reward untuk edit (jika ada)
}

type FormValidateType = {
  name: string
  description: string
  pointCost: number
  stock: number | ''
  isActive: boolean
  validUntil: string
  imageUrl: string
  category: string
  terms: string
  hasUnlimitedStock: boolean
  hasValidUntil: boolean
}

// Initial form data
const initialData: FormValidateType = {
  name: '',
  description: '',
  pointCost: 100,
  stock: '',
  isActive: true,
  validUntil: '',
  imageUrl: '',
  category: 'voucher',
  terms: '',
  hasUnlimitedStock: false,
  hasValidUntil: false
}

// Mock mutation hooks (replace with actual hooks)
const useRewardMutation = () => {
  const createReward = {
    mutate: (data: RewardRequest, options?: { onSuccess?: () => void }) => {
      console.log('Creating reward:', data)
      setTimeout(() => options?.onSuccess?.(), 1000)
    }
  }

  const updateReward = {
    mutate: (data: { id: string; payload: RewardRequest }, options?: { onSuccess?: () => void }) => {
      console.log('Updating reward:', data)
      setTimeout(() => options?.onSuccess?.(), 1000)
    }
  }

  return { createReward, updateReward }
}

// Reward categories
const REWARD_CATEGORIES = [
  { value: 'voucher', label: 'Voucher Diskon' },
  { value: 'cashback', label: 'Cashback' },
  { value: 'shipping', label: 'Gratis Ongkir' },
  { value: 'gift_card', label: 'Gift Card' },
  { value: 'physical', label: 'Barang Fisik' },
  { value: 'experience', label: 'Pengalaman' },
  { value: 'service', label: 'Layanan' }
]

const AddEditRewardDrawer = (props: Props) => {
  // Props
  const { open, handleClose, data } = props

  // States
  const [showMore, setShowMore] = useState(false)
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [imagePreview, setImagePreview] = useState<string | null>(null)

  const { createReward, updateReward } = useRewardMutation()

  // Determine if this is edit mode
  const isEditMode = Boolean(data?.id)

  // Hooks
  const {
    control,
    reset: resetForm,
    handleSubmit,
    watch,
    setValue,
    formState: { errors }
  } = useForm<FormValidateType>({
    defaultValues: initialData
  })

  const watchedImageUrl = watch('imageUrl')
  const watchedHasUnlimitedStock = watch('hasUnlimitedStock')
  const watchedHasValidUntil = watch('hasValidUntil')
  const watchedStock = watch('stock')
  const watchedPointCost = watch('pointCost')

  // Effect to populate form when editing
  useEffect(() => {
    if (isEditMode && data) {
      // Populate form with existing data
      const formData: FormValidateType = {
        name: data.name || '',
        description: data.description || '',
        pointCost: data.pointCost || 100,
        stock: data.stock ?? '',
        isActive: data.isActive ?? true,
        validUntil: data.validUntil ? new Date(data.validUntil).toISOString().split('T')[0] : '',
        imageUrl: data.imageUrl || '',
        category: 'voucher', // Default category
        terms: '',
        hasUnlimitedStock: data.stock === undefined || data.stock === null,
        hasValidUntil: Boolean(data.validUntil)
      }

      resetForm(formData)
      setShowMore(true) // Always show more for edit mode
      setImagePreview(data.imageUrl || null)
    } else {
      // Reset to initial data for add mode
      resetForm(initialData)
      setShowMore(false)
      setImagePreview(null)
    }
  }, [data, isEditMode, resetForm])

  // Handle image URL change
  useEffect(() => {
    if (watchedImageUrl) {
      setImagePreview(watchedImageUrl)
    } else {
      setImagePreview(null)
    }
  }, [watchedImageUrl])

  // Handle unlimited stock toggle
  useEffect(() => {
    if (watchedHasUnlimitedStock) {
      setValue('stock', '')
    }
  }, [watchedHasUnlimitedStock, setValue])

  // Handle valid until toggle
  useEffect(() => {
    if (!watchedHasValidUntil) {
      setValue('validUntil', '')
    }
  }, [watchedHasValidUntil, setValue])

  const handleFormSubmit = async (formData: FormValidateType) => {
    try {
      setIsSubmitting(true)

      // Create RewardRequest object
      const rewardRequest: RewardRequest = {
        name: formData.name,
        description: formData.description || undefined,
        pointCost: formData.pointCost,
        stock: formData.hasUnlimitedStock ? undefined : (formData.stock as number) || undefined,
        isActive: formData.isActive,
        validUntil: formData.hasValidUntil && formData.validUntil ? new Date(formData.validUntil) : undefined,
        imageUrl: formData.imageUrl || undefined,
        category: formData.category || undefined,
        terms: formData.terms || undefined
      }

      if (isEditMode && data?.id) {
        // Update existing reward
        updateReward.mutate(
          { id: data.id, payload: rewardRequest },
          {
            onSuccess: () => {
              handleReset()
              handleClose()
            }
          }
        )
      } else {
        // Create new reward
        createReward.mutate(rewardRequest, {
          onSuccess: () => {
            handleReset()
            handleClose()
          }
        })
      }
    } catch (error) {
      console.error('Error submitting reward:', error)
      // Handle error (show toast, etc.)
    } finally {
      setIsSubmitting(false)
    }
  }

  const handleReset = () => {
    handleClose()
    resetForm(initialData)
    setShowMore(false)
    setImagePreview(null)
  }

  const formatPoints = (value: number) => {
    return value.toLocaleString('id-ID') + ' poin'
  }

  const getStockDisplay = () => {
    if (watchedHasUnlimitedStock) return 'Unlimited'
    if (watchedStock === '' || watchedStock === 0) return 'Tidak ada stok'
    return `${watchedStock} item`
  }

  return (
    <Drawer
      open={open}
      anchor='right'
      variant='temporary'
      onClose={handleReset}
      ModalProps={{ keepMounted: true }}
      sx={{
        '& .MuiDrawer-paper': {
          width: { xs: 300, sm: 400 },
          display: 'flex',
          flexDirection: 'column',
          height: '100%'
        }
      }}
    >
      {/* Sticky Header */}
      <Box
        sx={{
          position: 'sticky',
          top: 0,
          zIndex: 10,
          backgroundColor: 'background.paper',
          borderBottom: 1,
          borderColor: 'divider'
        }}
      >
        <div className='flex items-center justify-between plb-5 pli-6'>
          <Typography variant='h5'>{isEditMode ? 'Edit Reward' : 'Tambah Reward Baru'}</Typography>
          <IconButton size='small' onClick={handleReset}>
            <i className='tabler-x text-2xl text-textPrimary' />
          </IconButton>
        </div>
      </Box>

      {/* Scrollable Content */}
      <Box sx={{ flex: 1, overflowY: 'auto' }}>
        <form id='reward-form' onSubmit={handleSubmit(handleFormSubmit)}>
          <div className='flex flex-col gap-6 p-6'>
            {/* Image Preview */}
            {imagePreview && (
              <Card variant='outlined' sx={{ mb: 2 }}>
                <CardContent sx={{ p: 2 }}>
                  <Typography variant='subtitle2' className='mb-2'>
                    Preview Gambar
                  </Typography>
                  <Avatar
                    src={imagePreview}
                    sx={{
                      width: 80,
                      height: 80,
                      mx: 'auto',
                      mb: 1
                    }}
                    variant='rounded'
                  >
                    <i className='tabler-gift text-2xl' />
                  </Avatar>
                </CardContent>
              </Card>
            )}

            {/* Nama Reward */}
            <div>
              <Typography variant='body2' className='mb-2'>
                Nama Reward <span className='text-red-500'>*</span>
              </Typography>
              <Controller
                name='name'
                control={control}
                rules={{ required: 'Nama reward wajib diisi' }}
                render={({ field }) => (
                  <CustomTextField
                    {...field}
                    fullWidth
                    placeholder='Masukkan nama reward'
                    error={!!errors.name}
                    helperText={errors.name?.message}
                  />
                )}
              />
            </div>

            {/* Kategori Reward */}
            <div>
              <Typography variant='body2' className='mb-2'>
                Kategori Reward <span className='text-red-500'>*</span>
              </Typography>
              <Controller
                name='category'
                control={control}
                rules={{ required: 'Kategori reward wajib dipilih' }}
                render={({ field }) => (
                  <CustomTextField
                    {...field}
                    select
                    fullWidth
                    error={!!errors.category}
                    helperText={errors.category?.message}
                  >
                    {REWARD_CATEGORIES.map(category => (
                      <MenuItem key={category.value} value={category.value}>
                        {category.label}
                      </MenuItem>
                    ))}
                  </CustomTextField>
                )}
              />
            </div>

            {/* Point Cost */}
            <div>
              <Typography variant='body2' className='mb-2'>
                Biaya Poin <span className='text-red-500'>*</span>
              </Typography>
              <Controller
                name='pointCost'
                control={control}
                rules={{
                  required: 'Biaya poin wajib diisi',
                  min: {
                    value: 1,
                    message: 'Biaya poin minimal 1'
                  }
                }}
                render={({ field }) => (
                  <CustomTextField
                    {...field}
                    fullWidth
                    type='number'
                    placeholder='100'
                    error={!!errors.pointCost}
                    helperText={errors.pointCost?.message || (field.value > 0 ? formatPoints(field.value) : '')}
                    InputProps={{
                      startAdornment: (
                        <InputAdornment position='start'>
                          <i className='tabler-star-filled text-warning' />
                        </InputAdornment>
                      )
                    }}
                    onChange={e => field.onChange(Number(e.target.value))}
                  />
                )}
              />
            </div>

            {/* Stock Management */}
            <div>
              <Typography variant='body2' className='mb-2'>
                Manajemen Stok
              </Typography>
              <Controller
                name='hasUnlimitedStock'
                control={control}
                render={({ field }) => (
                  <FormControlLabel
                    control={<Switch checked={field.value} onChange={field.onChange} color='primary' />}
                    label='Stok Unlimited'
                    className='mb-2'
                  />
                )}
              />
              {!watchedHasUnlimitedStock && (
                <Controller
                  name='stock'
                  control={control}
                  rules={{
                    required: !watchedHasUnlimitedStock ? 'Jumlah stok wajib diisi' : false,
                    min: {
                      value: 0,
                      message: 'Stok tidak boleh negatif'
                    }
                  }}
                  render={({ field }) => (
                    <CustomTextField
                      {...field}
                      fullWidth
                      type='number'
                      placeholder='0'
                      error={!!errors.stock}
                      helperText={errors.stock?.message || getStockDisplay()}
                      InputProps={{
                        startAdornment: <InputAdornment position='start'>Qty</InputAdornment>
                      }}
                      onChange={e => field.onChange(e.target.value ? Number(e.target.value) : '')}
                      value={field.value === '' ? '' : field.value}
                    />
                  )}
                />
              )}
            </div>

            {/* Status Aktif */}
            <div>
              <Controller
                name='isActive'
                control={control}
                render={({ field }) => (
                  <FormControlLabel
                    control={<Switch checked={field.value} onChange={field.onChange} color='primary' />}
                    label='Reward Aktif'
                  />
                )}
              />
            </div>

            {/* Tampilkan selengkapnya */}
            {!showMore && (
              <Button
                variant='text'
                color='primary'
                size='small'
                sx={{ textTransform: 'none', fontSize: '14px', p: 0, textAlign: 'left', width: '200px' }}
                onClick={() => setShowMore(true)}
              >
                + Tampilkan selengkapnya
              </Button>
            )}

            {/* Konten tambahan */}
            {showMore && (
              <>
                {/* Description */}
                <div>
                  <Typography variant='body2' className='mb-2'>
                    Deskripsi Reward
                  </Typography>
                  <Controller
                    name='description'
                    control={control}
                    render={({ field }) => (
                      <CustomTextField
                        {...field}
                        fullWidth
                        placeholder='Deskripsi detail tentang reward'
                        multiline
                        rows={3}
                      />
                    )}
                  />
                </div>

                {/* Image URL */}
                <div>
                  <Typography variant='body2' className='mb-2'>
                    URL Gambar
                  </Typography>
                  <Controller
                    name='imageUrl'
                    control={control}
                    render={({ field }) => (
                      <CustomTextField
                        {...field}
                        fullWidth
                        placeholder='https://example.com/image.jpg'
                        type='url'
                        InputProps={{
                          startAdornment: (
                            <InputAdornment position='start'>
                              <i className='tabler-photo' />
                            </InputAdornment>
                          )
                        }}
                      />
                    )}
                  />
                </div>

                {/* Valid Until */}
                <div>
                  <Typography variant='body2' className='mb-2'>
                    Masa Berlaku
                  </Typography>
                  <Controller
                    name='hasValidUntil'
                    control={control}
                    render={({ field }) => (
                      <FormControlLabel
                        control={<Switch checked={field.value} onChange={field.onChange} color='primary' />}
                        label='Memiliki batas waktu'
                        className='mb-2'
                      />
                    )}
                  />
                  {watchedHasValidUntil && (
                    <Controller
                      name='validUntil'
                      control={control}
                      rules={{
                        required: watchedHasValidUntil ? 'Tanggal kadaluarsa wajib diisi' : false
                      }}
                      render={({ field }) => (
                        <CustomTextField
                          {...field}
                          fullWidth
                          type='date'
                          error={!!errors.validUntil}
                          helperText={errors.validUntil?.message}
                          InputLabelProps={{
                            shrink: true
                          }}
                        />
                      )}
                    />
                  )}
                </div>

                {/* Terms & Conditions */}
                <div>
                  <Typography variant='body2' className='mb-2'>
                    Syarat & Ketentuan
                  </Typography>
                  <Controller
                    name='terms'
                    control={control}
                    render={({ field }) => (
                      <CustomTextField
                        {...field}
                        fullWidth
                        placeholder='Syarat dan ketentuan penggunaan reward'
                        multiline
                        rows={3}
                      />
                    )}
                  />
                </div>

                {/* Sembunyikan */}
                <Button
                  variant='text'
                  color='primary'
                  size='small'
                  sx={{ textTransform: 'none', fontSize: '14px', p: 0, textAlign: 'left', width: '200px' }}
                  onClick={() => setShowMore(false)}
                >
                  - Sembunyikan
                </Button>
              </>
            )}
          </div>
        </form>
      </Box>

      {/* Sticky Footer */}
      <Box
        sx={{
          position: 'sticky',
          bottom: 0,
          zIndex: 10,
          backgroundColor: 'background.paper',
          borderTop: 1,
          borderColor: 'divider',
          p: 3
        }}
      >
        <div className='flex items-center gap-4'>
          <Button variant='contained' type='submit' form='reward-form' disabled={isSubmitting}>
            {isSubmitting ? (isEditMode ? 'Mengupdate...' : 'Menyimpan...') : isEditMode ? 'Update' : 'Simpan'}
          </Button>
          <Button variant='outlined' color='error' onClick={handleReset} disabled={isSubmitting}>
            Batal
          </Button>
        </div>
      </Box>
    </Drawer>
  )
}

export default AddEditRewardDrawer
