<template>
  <Dialog :open="isOpen" @update:open="(open) => !open && $emit('close')">
    <DialogContent class="sm:max-w-3xl max-h-[90vh] overflow-y-auto">
      <DialogHeader>
        <DialogTitle>{{ product ? 'Edit' : 'Add New' }} Product{{ stall?.name ? ` ${product ? 'in' : 'to'} ${stall.name}` : '' }}</DialogTitle>
      </DialogHeader>
      
      <form @submit="onSubmit" class="space-y-6 py-4" autocomplete="off">
        <!-- Basic Product Info -->
        <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
          <!-- Product Name -->
          <FormField v-slot="{ componentField }" name="name">
            <FormItem>
              <FormLabel>Product Name *</FormLabel>
              <FormControl>
                <Input 
                  placeholder="Enter product name"
                  :disabled="isCreating"
                  v-bind="componentField"
                />
              </FormControl>
              <FormDescription>Choose a clear, descriptive name</FormDescription>
              <FormMessage />
            </FormItem>
          </FormField>

          <!-- Price -->
          <FormField v-slot="{ componentField }" name="price">
            <FormItem>
              <FormLabel>Price * ({{ stall?.currency || 'sat' }})</FormLabel>
              <FormControl>
                <Input 
                  type="number"
                  step="0.01"
                  min="0.01"
                  placeholder="0.00"
                  :disabled="isCreating"
                  v-bind="componentField"
                />
              </FormControl>
              <FormDescription>Price in {{ stall?.currency || 'sat' }}</FormDescription>
              <FormMessage />
            </FormItem>
          </FormField>
        </div>

        <!-- Description -->
        <FormField v-slot="{ componentField }" name="description">
          <FormItem>
            <FormLabel>Description</FormLabel>
            <FormControl>
              <Textarea
                placeholder="Describe your product, its features, and benefits"
                :disabled="isCreating"
                v-bind="componentField"
                rows="4"
              />
            </FormControl>
            <FormDescription>Detailed description to help customers understand your product</FormDescription>
            <FormMessage />
          </FormItem>
        </FormField>

        <!-- Quantity and Active Status -->
        <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
          <!-- Quantity -->
          <FormField v-slot="{ componentField }" name="quantity">
            <FormItem>
              <FormLabel>Quantity *</FormLabel>
              <FormControl>
                <Input 
                  type="number"
                  min="0"
                  placeholder="1"
                  :disabled="isCreating"
                  v-bind="componentField"
                />
              </FormControl>
              <FormDescription>Available quantity (0 = unlimited)</FormDescription>
              <FormMessage />
            </FormItem>
          </FormField>

          <!-- Active Status -->
          <FormField v-slot="{ value, handleChange }" name="active">
            <FormItem>
              <div class="space-y-3">
                <FormLabel>Product Status</FormLabel>
                <FormControl>
                  <div class="flex items-center space-x-2">
                    <Checkbox
                      :checked="value"
                      @update:checked="handleChange"
                      :disabled="isCreating"
                    />
                    <Label>Product is active and visible</Label>
                  </div>
                </FormControl>
                <FormDescription>Inactive products won't be shown to customers</FormDescription>
                <FormMessage />
              </div>
            </FormItem>
          </FormField>
        </div>

        <!-- Categories -->
        <FormField v-slot="{ componentField }" name="categories">
          <FormItem>
            <FormLabel>Categories</FormLabel>
            <FormDescription>Add categories to help customers find your product</FormDescription>
            <FormControl>
              <CategoryInput
                v-bind="componentField"
                :disabled="isCreating"
                placeholder="Enter category (e.g., electronics, clothing, books...)"
                :max-categories="10"
                :show-popular-categories="true"
              />
            </FormControl>
            <FormMessage />
          </FormItem>
        </FormField>

        <!-- Images -->
        <FormField name="images">
          <FormItem>
            <FormLabel>Product Images</FormLabel>
            <FormDescription>Add images to showcase your product</FormDescription>
            <div class="text-center py-8 border-2 border-dashed rounded-lg">
              <Package class="w-8 h-8 mx-auto mb-2 text-muted-foreground" />
              <p class="text-sm text-muted-foreground">Image upload coming soon</p>
            </div>
            <FormMessage />
          </FormItem>
        </FormField>

        <!-- Auto-reply Settings -->
        <div class="border-t pt-6">
          <FormField v-slot="{ value, handleChange }" name="use_autoreply">
            <FormItem>
              <div class="flex items-center space-x-2">
                <FormControl>
                  <Checkbox
                    :checked="value"
                    @update:checked="handleChange"
                    :disabled="isCreating"
                  />
                </FormControl>
                <FormLabel>Enable auto-reply to customer messages</FormLabel>
              </div>
              <FormDescription>Automatically respond to customer inquiries about this product</FormDescription>
              <FormMessage />
            </FormItem>
          </FormField>

          <FormField v-slot="{ componentField }" name="autoreply_message">
            <FormItem class="mt-4">
              <FormLabel>Auto-reply Message</FormLabel>
              <FormControl>
                <Textarea
                  placeholder="Thank you for your interest! I'll get back to you soon..."
                  :disabled="isCreating"
                  v-bind="componentField"
                  rows="3"
                />
              </FormControl>
              <FormDescription>Message sent automatically when customers inquire about this product</FormDescription>
              <FormMessage />
            </FormItem>
          </FormField>
        </div>

        <!-- Error Display -->
        <div v-if="createError" class="text-sm text-destructive">
          {{ createError }}
        </div>

        <div class="flex justify-end space-x-2 pt-4">
          <Button 
            type="button"
            @click="$emit('close')" 
            variant="outline"
            :disabled="isCreating"
          >
            Cancel
          </Button>
          <Button 
            type="submit"
            :disabled="isCreating || !isFormValid"
          >
            {{ submitButtonText }}
          </Button>
        </div>
      </form>
    </DialogContent>
  </Dialog>
</template>

<script setup lang="ts">
import { ref, computed, watch, nextTick } from 'vue'
import { useForm } from 'vee-validate'
import { toTypedSchema } from '@vee-validate/zod'
import * as z from 'zod'
import { Button } from '@/components/ui/button'
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { Textarea } from '@/components/ui/textarea'
import { Checkbox } from '@/components/ui/checkbox'
import CategoryInput from './CategoryInput.vue'
import {
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from '@/components/ui/form'
import { Package } from 'lucide-vue-next'
import type { NostrmarketAPI, Stall, Product, CreateProductRequest } from '../services/nostrmarketAPI'
import { auth } from '@/composables/useAuthService'
import { useToast } from '@/core/composables/useToast'
import { injectService, SERVICE_TOKENS } from '@/core/di-container'

// Props and emits
interface Props {
  isOpen: boolean
  stall?: Stall | null
  product?: Product | null  // For editing existing products
}

const props = defineProps<Props>()
const emit = defineEmits<{
  close: []
  created: [product: any]
  updated: [product: any]
}>()

// Services
const nostrmarketAPI = injectService(SERVICE_TOKENS.NOSTRMARKET_API) as NostrmarketAPI
const paymentService = injectService(SERVICE_TOKENS.PAYMENT_SERVICE) as any
const toast = useToast()

// Local state
const isCreating = ref(false)
const createError = ref<string | null>(null)

// Computed properties
const isEditMode = computed(() => !!props.product?.id)
const submitButtonText = computed(() => isCreating.value ? 
  (isEditMode.value ? 'Updating...' : 'Creating...') : 
  (isEditMode.value ? 'Update Product' : 'Create Product')
)

// Product form schema
const productFormSchema = toTypedSchema(z.object({
  name: z.string().min(1, "Product name is required").max(100, "Product name must be less than 100 characters"),
  description: z.string().max(1000, "Description must be less than 1000 characters"),
  price: z.number().min(0.01, "Price must be greater than 0"),
  quantity: z.number().int().min(0, "Quantity must be 0 or greater"),
  categories: z.array(z.string()).max(10, "Maximum 10 categories allowed"),
  images: z.array(z.string().url("Invalid image URL")).max(5, "Maximum 5 images allowed"),
  active: z.boolean(),
  use_autoreply: z.boolean(),
  autoreply_message: z.string().max(500, "Auto-reply message must be less than 500 characters")
}))

// Product form setup with vee-validate
const form = useForm({
  validationSchema: productFormSchema,
  initialValues: {
    name: '',
    description: '',
    price: 0,
    quantity: 1,
    categories: [] as string[],
    images: [] as string[],
    active: true,
    use_autoreply: false,
    autoreply_message: ''
  }
})

// Destructure product form methods
const { resetForm, meta } = form

// Product form validation computed
const isFormValid = computed(() => meta.value.valid)

// Product form submit handler
const onSubmit = form.handleSubmit(async (values) => {
  await createOrUpdateProduct(values)
})

// Methods
const createOrUpdateProduct = async (formData: any) => {
  if (isEditMode.value) {
    await updateProduct(formData)
  } else {
    await createProduct(formData)
  }
}

const updateProduct = async (formData: any) => {
  const currentUser = auth.currentUser?.value
  if (!currentUser?.wallets?.length || !props.product?.id) {
    toast.error('No active store or product ID available')
    return
  }

  const { 
    name, 
    description, 
    price, 
    quantity, 
    categories, 
    images, 
    active, 
    use_autoreply, 
    autoreply_message 
  } = formData

  isCreating.value = true
  createError.value = null

  try {
    const productData: Product = {
      id: props.product.id,
      stall_id: props.product.stall_id,
      name,
      categories: categories || [],
      images: images || [],
      price: Number(price),
      quantity: Number(quantity),
      active,
      pending: false,
      config: {
        description: description || '',
        currency: props.stall?.currency || props.product.config.currency,
        use_autoreply,
        autoreply_message: use_autoreply ? autoreply_message || '' : '',
        shipping: props.product.config.shipping || []
      }
    }

    const adminKey = paymentService.getPreferredWalletAdminKey()
    if (!adminKey) {
      throw new Error('No wallet admin key available')
    }

    const updatedProduct = await nostrmarketAPI.updateProduct(
      adminKey,
      props.product.id,
      productData
    )

    // Reset form and close dialog
    resetForm()
    emit('updated', updatedProduct)
    emit('close')
    
    toast.success(`Product "${name}" updated successfully!`)
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : 'Failed to update product'
    console.error('Error updating product:', error)
    createError.value = errorMessage
    toast.error(`Failed to update product: ${errorMessage}`)
  } finally {
    isCreating.value = false
  }
}

const createProduct = async (formData: any) => {
  const currentUser = auth.currentUser?.value
  if (!currentUser?.wallets?.length || !props.stall) {
    toast.error('No active store or wallets available')
    return
  }

  const { 
    name, 
    description, 
    price, 
    quantity, 
    categories, 
    images, 
    active, 
    use_autoreply, 
    autoreply_message 
  } = formData

  isCreating.value = true
  createError.value = null

  try {
    const productData: CreateProductRequest = {
      stall_id: props.stall.id!,
      name,
      categories: categories || [],
      images: images || [],
      price: Number(price),
      quantity: Number(quantity),
      active,
      config: {
        description: description || '',
        currency: props.stall.currency,
        use_autoreply,
        autoreply_message: use_autoreply ? autoreply_message || '' : '',
        shipping: [] // Will be populated from shipping zones if needed
      }
    }

    const adminKey = paymentService.getPreferredWalletAdminKey()
    if (!adminKey) {
      throw new Error('No wallet admin key available')
    }

    const newProduct = await nostrmarketAPI.createProduct(
      adminKey,
      productData
    )

    // Reset form and close dialog
    resetForm()
    emit('created', newProduct)
    emit('close')
    
    toast.success(`Product "${name}" created successfully!`)
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : 'Failed to create product'
    console.error('Error creating product:', error)
    createError.value = errorMessage
    toast.error(`Failed to create product: ${errorMessage}`)
  } finally {
    isCreating.value = false
  }
}

// Initialize data when dialog opens
watch(() => props.isOpen, async (isOpen) => {
  if (isOpen) {
    // If editing, pre-populate with existing product data
    const initialValues = props.product ? {
      name: props.product.name || '',
      description: props.product.config?.description || '',
      price: props.product.price || 0,
      quantity: props.product.quantity || 1,
      categories: props.product.categories || [],
      images: props.product.images || [],
      active: props.product.active ?? true,
      use_autoreply: props.product.config?.use_autoreply || false,
      autoreply_message: props.product.config?.autoreply_message || ''
    } : {
      name: '',
      description: '',
      price: 0,
      quantity: 1,
      categories: [],
      images: [],
      active: true,
      use_autoreply: false,
      autoreply_message: ''
    }
    
    // Reset form with appropriate initial values
    resetForm({ values: initialValues })
    
    // Wait for reactivity
    await nextTick()
    
    // Clear any previous errors
    createError.value = null
  }
})
</script>