import { ref, computed, onMounted, onUnmounted, readonly } from 'vue'
import { useNostrStore } from '@/stores/nostr'
import { useMarketStore } from '@/stores/market'
import { useRelayHub } from '@/composables/useRelayHub'
import { config } from '@/lib/config'

// Nostr event kinds for market functionality
const MARKET_EVENT_KINDS = {
  MARKET: 30019,
  STALL: 30017,
  PRODUCT: 30018,
  ORDER: 30020
} as const

export function useMarket() {
  const nostrStore = useNostrStore()
  const marketStore = useMarketStore()
  const relayHub = useRelayHub()

  // State
  const isLoading = ref(false)
  const error = ref<Error | null>(null)
  const isConnected = ref(false)
  const activeMarket = computed(() => marketStore.activeMarket)
  const markets = computed(() => marketStore.markets)
  const stalls = computed(() => marketStore.stalls)
  const products = computed(() => marketStore.products)
  const orders = computed(() => marketStore.orders)

  // Connection state
  const connectionStatus = computed(() => {
    if (isConnected.value) return 'connected'
    if (nostrStore.isConnecting) return 'connecting'
    if (nostrStore.error) return 'error'
    return 'disconnected'
  })

  // Load market from naddr
  const loadMarket = async (naddr: string) => {
    try {
      isLoading.value = true
      error.value = null

      console.log('Loading market from naddr:', naddr)

      // Parse naddr to get market data
      const marketData = {
        identifier: naddr.split(':')[2] || 'default',
        pubkey: naddr.split(':')[1] || nostrStore.account?.pubkey || ''
      }

      if (!marketData.pubkey) {
        throw new Error('No pubkey available for market')
      }

      await loadMarketData(marketData)

    } catch (err) {
      error.value = err instanceof Error ? err : new Error('Failed to load market')
      console.error('Error loading market:', err)
      throw err
    } finally {
      isLoading.value = false
    }
  }

  // Load market data from Nostr events
  const loadMarketData = async (marketData: any) => {
    try {
      console.log('Loading market data for:', marketData)

      // Fetch market configuration event
      const events = await relayHub.queryEvents([
        {
          kinds: [MARKET_EVENT_KINDS.MARKET],
          authors: [marketData.pubkey],
          '#d': [marketData.identifier]
        }
      ])

      console.log('Found market events:', events.length)

      if (events.length > 0) {
        const marketEvent = events[0]
        console.log('Market event:', marketEvent)

        const market = {
          d: marketData.identifier,
          pubkey: marketData.pubkey,
          relays: config.market.supportedRelays,
          selected: true,
          opts: JSON.parse(marketEvent.content)
        }

        marketStore.addMarket(market)
        marketStore.setActiveMarket(market)
      } else {
        console.warn('No market events found')
        // Create a default market if none exists
        const market = {
          d: marketData.identifier,
          pubkey: marketData.pubkey,
          relays: config.market.supportedRelays,
          selected: true,
          opts: {
            name: 'Ariège Market',
            description: 'A communal market to sell your goods',
            merchants: [],
            ui: {}
          }
        }

        marketStore.addMarket(market)
        marketStore.setActiveMarket(market)
      }

    } catch (err) {
      console.error('Error loading market data:', err)
      // Don't throw error, create default market instead
      const market = {
        d: marketData.identifier,
        pubkey: marketData.pubkey,
        relays: config.market.supportedRelays,
        selected: true,
        opts: {
          name: 'Default Market',
          description: 'A default market',
          merchants: [],
          ui: {}
        }
      }

      marketStore.addMarket(market)
      marketStore.setActiveMarket(market)
    }
  }

  // Load stalls from market merchants
  const loadStalls = async () => {
    try {
      // Get the active market to filter by its merchants
      const activeMarket = marketStore.activeMarket
      if (!activeMarket) {
        console.warn('No active market found')
        return
      }

      const merchants = [...(activeMarket.opts.merchants || [])]
      console.log('Loading stalls from market merchants:', merchants)

      if (merchants.length === 0) {
        console.log('No merchants in market, skipping stall loading')
        return
      }

      // Fetch stall events from market merchants only
      const events = await relayHub.queryEvents([
        {
          kinds: [MARKET_EVENT_KINDS.STALL],
          authors: merchants
        }
      ])

      console.log('Found stall events:', events.length)

      // Group events by stall ID and keep only the most recent version
      const stallGroups = new Map<string, any[]>()
      events.forEach((event: any) => {
        const stallId = event.tags.find((tag: any) => tag[0] === 'd')?.[1]
        if (stallId) {
          if (!stallGroups.has(stallId)) {
            stallGroups.set(stallId, [])
          }
          stallGroups.get(stallId)!.push(event)
        }
      })

      // Process each stall group
      stallGroups.forEach((stallEvents, stallId) => {
        // Sort by created_at and take the most recent
        const latestEvent = stallEvents.sort((a: any, b: any) => b.created_at - a.created_at)[0]
        
        try {
          const stallData = JSON.parse(latestEvent.content)
          const stall = {
            id: stallId,
            pubkey: latestEvent.pubkey,
            name: stallData.name || 'Unnamed Stall',
            description: stallData.description || '',
            created_at: latestEvent.created_at,
            ...stallData
          }
          
          marketStore.addStall(stall)
        } catch (err) {
          console.warn('Failed to parse stall data:', err)
        }
      })

    } catch (err) {
      console.error('Error loading stalls:', err)
    }
  }

  // Load products from market stalls
  const loadProducts = async () => {
    try {
      const activeMarket = marketStore.activeMarket
      if (!activeMarket) {
        console.warn('No active market found')
        return
      }

      const merchants = [...(activeMarket.opts.merchants || [])]
      if (merchants.length === 0) {
        console.log('No merchants in market, skipping product loading')
        return
      }

      // Fetch product events from market merchants
      const events = await relayHub.queryEvents([
        {
          kinds: [MARKET_EVENT_KINDS.PRODUCT],
          authors: merchants
        }
      ])

      console.log('Found product events:', events.length)

      // Group events by product ID and keep only the most recent version
      const productGroups = new Map<string, any[]>()
      events.forEach((event: any) => {
        const productId = event.tags.find((tag: any) => tag[0] === 'd')?.[1]
        if (productId) {
          if (!productGroups.has(productId)) {
            productGroups.set(productId, [])
          }
          productGroups.get(productId)!.push(event)
        }
      })

      // Process each product group
      productGroups.forEach((productEvents, productId) => {
        // Sort by created_at and take the most recent
        const latestEvent = productEvents.sort((a: any, b: any) => b.created_at - a.created_at)[0]
        
        try {
          const productData = JSON.parse(latestEvent.content)
          const product = {
            id: productId,
            stall_id: productData.stall_id || 'unknown',
            stallName: productData.stallName || 'Unknown Stall',
            name: productData.name || 'Unnamed Product',
            description: productData.description || '',
            price: productData.price || 0,
            currency: productData.currency || 'sats',
            quantity: productData.quantity || 1,
            images: productData.images || [],
            categories: productData.categories || [],
            createdAt: latestEvent.created_at,
            updatedAt: latestEvent.created_at
          }
          
          marketStore.addProduct(product)
        } catch (err) {
          console.warn('Failed to parse product data:', err)
        }
      })

    } catch (err) {
      console.error('Error loading products:', err)
    }
  }

  // Add sample products for testing
  const addSampleProducts = () => {
    const sampleProducts = [
      {
        id: 'sample-1',
        stall_id: 'sample-stall',
        stallName: 'Sample Stall',
        pubkey: nostrStore.account?.pubkey || '',
        name: 'Sample Product 1',
        description: 'This is a sample product for testing',
        price: 1000,
        currency: 'sats',
        quantity: 1,
        images: [],
        categories: [],
        createdAt: Math.floor(Date.now() / 1000),
        updatedAt: Math.floor(Date.now() / 1000)
      },
      {
        id: 'sample-2',
        stall_id: 'sample-stall',
        stallName: 'Sample Stall',
        pubkey: nostrStore.account?.pubkey || '',
        name: 'Sample Product 2',
        description: 'Another sample product for testing',
        price: 2000,
        currency: 'sats',
        quantity: 1,
        images: [],
        categories: [],
        createdAt: Math.floor(Date.now() / 1000),
        updatedAt: Math.floor(Date.now() / 1000)
      }
    ]

    sampleProducts.forEach(product => {
      marketStore.addProduct(product)
    })
  }

  // Subscribe to market updates
  const subscribeToMarketUpdates = (): (() => void) | null => {
    try {
      const activeMarket = marketStore.activeMarket
      if (!activeMarket) {
        console.warn('No active market found for subscription')
        return null
      }

      // Subscribe to market events
      const unsubscribe = relayHub.subscribe({
        id: `market-${activeMarket.d}`,
        filters: [
          { kinds: [MARKET_EVENT_KINDS.MARKET] },
          { kinds: [MARKET_EVENT_KINDS.STALL] },
          { kinds: [MARKET_EVENT_KINDS.PRODUCT] },
          { kinds: [MARKET_EVENT_KINDS.ORDER] }
        ],
        onEvent: (event: any) => {
          handleMarketEvent(event)
        }
      })

      return unsubscribe
    } catch (error) {
      console.error('Failed to subscribe to market updates:', error)
      return null
    }
  }

  // Handle incoming market events
  const handleMarketEvent = (event: any) => {
    console.log('Received market event:', event)

    switch (event.kind) {
      case MARKET_EVENT_KINDS.MARKET:
        // Handle market updates
        break
      case MARKET_EVENT_KINDS.STALL:
        // Handle stall updates
        handleStallEvent(event)
        break
      case MARKET_EVENT_KINDS.PRODUCT:
        // Handle product updates
        handleProductEvent(event)
        break
      case MARKET_EVENT_KINDS.ORDER:
        // Handle order updates
        handleOrderEvent(event)
        break
    }
  }

  // Process pending products (products without stalls)
  const processPendingProducts = () => {
    const productsWithoutStalls = products.value.filter(product => {
      // Check if product has a stall tag
      return !product.stall_id
    })

    if (productsWithoutStalls.length > 0) {
      console.log('Found products without stalls:', productsWithoutStalls.length)
      // You could create default stalls or handle this as needed
    }
  }

  // Handle stall events
  const handleStallEvent = (event: any) => {
    try {
      const stallId = event.tags.find((tag: any) => tag[0] === 'd')?.[1]
      if (stallId) {
        const stallData = JSON.parse(event.content)
        const stall = {
          id: stallId,
          pubkey: event.pubkey,
          name: stallData.name || 'Unnamed Stall',
          description: stallData.description || '',
          created_at: event.created_at,
          ...stallData
        }
        
        marketStore.addStall(stall)
      }
    } catch (err) {
      console.warn('Failed to handle stall event:', err)
    }
  }

  // Handle product events
  const handleProductEvent = (event: any) => {
    try {
      const productId = event.tags.find((tag: any) => tag[0] === 'd')?.[1]
      if (productId) {
        const productData = JSON.parse(event.content)
        const product = {
          id: productId,
          stall_id: productData.stall_id || 'unknown',
          stallName: productData.stallName || 'Unknown Stall',
          pubkey: event.pubkey,
          name: productData.name || 'Unnamed Product',
          description: productData.description || '',
          price: productData.price || 0,
          currency: productData.currency || 'sats',
          quantity: productData.quantity || 1,
          images: productData.images || [],
          categories: productData.categories || [],
          createdAt: event.created_at,
          updatedAt: event.created_at
        }
        
        marketStore.addProduct(product)
      }
    } catch (err) {
      console.warn('Failed to handle product data:', err)
    }
  }

  // Handle order events
  const handleOrderEvent = (event: any) => {
    try {
      const orderData = JSON.parse(event.content)
      const order = {
        id: event.id,
        stall_id: orderData.stall_id || 'unknown',
        product_id: orderData.product_id || 'unknown',
        buyer_pubkey: event.pubkey,
        seller_pubkey: orderData.seller_pubkey || '',
        quantity: orderData.quantity || 1,
        total_price: orderData.total_price || 0,
        currency: orderData.currency || 'sats',
        status: orderData.status || 'pending',
        payment_request: orderData.payment_request,
        created_at: event.created_at,
        updated_at: event.created_at
      }
      
      // Note: addOrder method doesn't exist in the store, so we'll just log it
      console.log('Received order event:', order)
    } catch (err) {
      console.warn('Failed to handle order event:', err)
    }
  }

  // Publish a product
  const publishProduct = async (_productData: any) => {
    // Implementation would depend on your event creation logic
    console.log('Publishing product:', _productData)
  }

  // Publish a stall
  const publishStall = async (_stallData: any) => {
    // Implementation would depend on your event creation logic
    console.log('Publishing stall:', _stallData)
  }

  // Connect to market
  const connectToMarket = async () => {
    try {
      console.log('Connecting to market...')
      
      // Connect to relay hub
      await relayHub.connect()
      isConnected.value = relayHub.isConnected.value

      if (!isConnected.value) {
        throw new Error('Failed to connect to Nostr relays')
      }

      console.log('Connected to market')
      
      // Load market data
      await loadMarketData({
        identifier: 'default',
        pubkey: nostrStore.account?.pubkey || ''
      })

      // Load stalls and products
      await loadStalls()
      await loadProducts()

      // Subscribe to updates
      subscribeToMarketUpdates()

    } catch (err) {
      error.value = err instanceof Error ? err : new Error('Failed to connect to market')
      console.error('Error connecting to market:', err)
      throw err
    }
  }

  // Disconnect from market
  const disconnectFromMarket = () => {
    isConnected.value = false
    error.value = null
    console.log('Disconnected from market')
  }

  // Initialize market on mount
  onMounted(async () => {
    if (nostrStore.isConnected) {
      await connectToMarket()
    }
  })

  // Cleanup on unmount
  onUnmounted(() => {
    disconnectFromMarket()
  })

  return {
    // State
    isLoading: readonly(isLoading),
    error: readonly(error),
    isConnected: readonly(isConnected),
    connectionStatus: readonly(connectionStatus),
    activeMarket: readonly(activeMarket),
    markets: readonly(markets),
    stalls: readonly(stalls),
    products: readonly(products),
    orders: readonly(orders),

    // Actions
    loadMarket,
    connectToMarket,
    disconnectFromMarket,
    addSampleProducts,
    processPendingProducts,
    publishProduct,
    publishStall,
    subscribeToMarketUpdates
  }
}