import { defineStore } from 'pinia'
import { ref, computed, watch } from 'vue'
import type { NostrEvent, NostrProfile, NostrAccount, DirectMessage } from '../types/nostr'

declare global {
  interface Window {
    NostrTools: {
      getPublicKey: (privkey: string) => string
      generatePrivateKey: () => string
      nip04: {
        encrypt: (privkey: string, pubkey: string, content: string) => Promise<string>
        decrypt: (privkey: string, pubkey: string, content: string) => Promise<string>
      }
      getEventHash: (event: NostrEvent) => string
      signEvent: (event: NostrEvent, privkey: string) => Promise<string>
      getSignature: (event: NostrEvent, privkey: string) => string
      verifySignature: (event: NostrEvent) => boolean
      nip19: {
        decode: (str: string) => { type: string; data: string }
        npubEncode: (hex: string) => string
      }
      relayInit: (url: string) => {
        connect: () => Promise<void>
        sub: (filters: any[]) => {
          on: (event: string, callback: (event: NostrEvent) => void) => void
        }
        publish: (event: NostrEvent) => {
          on: (type: 'ok' | 'failed', cb: (msg?: string) => void) => void
        }
        close: () => void
      }
    }
  }
}

const DEFAULT_RELAYS = [
  'wss://nostr.atitlan.io'
]

// Get support agent's public key from environment variable
const SUPPORT_NPUB = import.meta.env.VITE_SUPPORT_NPUB

// Helper functions
async function connectToRelay(url: string) {
  console.log(`Attempting to connect to relay: ${url}`)
  const relay = window.NostrTools.relayInit(url)
  try {
    console.log(`Initializing connection to ${url}...`)
    await relay.connect()
    console.log(`Successfully connected to ${url}`)
    return relay
  } catch (err) {
    console.error(`Failed to connect to ${url}:`, err)
    if (err instanceof Error) {
      console.error('Error details:', {
        message: err.message,
        name: err.name,
        stack: err.stack
      })
    }
    return null
  }
}

async function publishEvent(event: NostrEvent, relays: { url: string }[]) {
  const promises = relays.map(async ({ url }) => {
    const relay = window.NostrTools.relayInit(url)
    try {
      await relay.connect()
      const pub = relay.publish(event)
      return new Promise((resolve, reject) => {
        pub.on('ok', () => resolve(true))
        pub.on('failed', reject)
      })
    } catch (err) {
      console.error(`Failed to publish to ${url}:`, err)
      return false
    }
  })

  await Promise.all(promises)
}

export const useNostrStore = defineStore('nostr', () => {
  // State
  const account = ref<NostrAccount | null>(JSON.parse(localStorage.getItem('nostr_account') || 'null'))
  const profiles = ref<Map<string, NostrProfile>>(new Map())
  const messages = ref<Map<string, DirectMessage[]>>(new Map())
  const activeChat = ref<string | null>(null)
  const relayPool = ref<any[]>([])
  const processedMessageIds = ref(new Set<string>())

  // Watch account changes and persist to localStorage
  watch(account, (newAccount) => {
    if (newAccount) {
      localStorage.setItem('nostr_account', JSON.stringify(newAccount))
    } else {
      localStorage.removeItem('nostr_account')
    }
  }, { deep: true })

  // Initialize store if account exists in localStorage
  if (account.value) {
    console.log('Found existing account, initializing connection...')
    init()
  }

  // Computed
  const isLoggedIn = computed(() => !!account.value)
  const currentMessages = computed(() => 
    activeChat.value ? messages.value.get(activeChat.value) || [] : []
  )

  // Initialize connection if account exists
  async function init() {
    if (account.value) {
      // Clear existing state
      messages.value.clear()
      profiles.value.clear()
      processedMessageIds.value.clear()
      
      // Close existing connections
      relayPool.value.forEach(relay => relay.close())
      relayPool.value = []

      // Connect to relays
      const connectedRelays = await Promise.all(
        account.value.relays.map(relay => connectToRelay(relay.url))
      )
      
      relayPool.value = connectedRelays.filter(relay => relay !== null)

      // Subscribe to messages and load history
      await Promise.all([
        subscribeToMessages(),
        loadProfiles()
      ])

      // Set active chat to support agent
      activeChat.value = SUPPORT_NPUB
    }
  }

  // Actions
  async function login(privkey: string) {
    const pubkey = window.NostrTools.getPublicKey(privkey)
    
    account.value = {
      pubkey,
      privkey,
      relays: DEFAULT_RELAYS.map(url => ({ url, read: true, write: true }))
    }

    // Initialize connection and load messages
    await init()
  }

  async function loadProfiles() {
    if (!account.value) return

    const filter = {
      kinds: [0],
      authors: Array.from(messages.value.keys())
    }

    if (filter.authors.length === 0) return

    relayPool.value.forEach(relay => {
      const sub = relay.sub([filter])
      
      sub.on('event', (event: NostrEvent) => {
        try {
          const profile = JSON.parse(event.content)
          profiles.value.set(event.pubkey, {
            pubkey: event.pubkey,
            name: profile.name,
            picture: profile.picture,
            about: profile.about,
            nip05: profile.nip05
          })
        } catch (err) {
          console.error('Failed to parse profile:', err)
        }
      })
    })
  }

  async function logout() {
    account.value = null
    relayPool.value.forEach(relay => relay.close())
    relayPool.value = []
    messages.value.clear()
    profiles.value.clear()
    activeChat.value = null
  }

  const addMessage = async (pubkey: string, message: DirectMessage) => {
    // Skip if we've already processed this message
    if (processedMessageIds.value.has(message.id)) {
      return
    }

    // Add message ID to processed set
    processedMessageIds.value.add(message.id)

    // Add message to the map
    const userMessages = messages.value.get(pubkey) || []
    messages.value.set(pubkey, [...userMessages, message])

    // Sort messages by timestamp
    const sortedMessages = messages.value.get(pubkey) || []
    sortedMessages.sort((a, b) => a.created_at - b.created_at)
    messages.value.set(pubkey, sortedMessages)
  }

  async function sendMessage(to: string, content: string) {
    if (!account.value) return

    const encrypted = await window.NostrTools.nip04.encrypt(account.value.privkey, to, content)
    const event: NostrEvent = {
      kind: 4,
      pubkey: account.value.pubkey,
      created_at: Math.floor(Date.now() / 1000),
      tags: [['p', to]],
      content: encrypted,
      id: '',
      sig: ''
    }

    event.id = window.NostrTools.getEventHash(event)
    event.sig = await window.NostrTools.signEvent(event, account.value.privkey)

    // Add to local messages first
    const dm: DirectMessage = {
      id: event.id,
      pubkey: to,
      content,
      created_at: event.created_at,
      sent: true
    }

    await addMessage(to, dm)

    // Then publish to relays
    await publishEvent(event, account.value.relays)
  }

  const subscribeToMessages = async () => {
    if (!account.value) return

    // Filter for received messages with history
    const receivedFilter = {
      kinds: [4],
      '#p': [account.value.pubkey],
      since: 0 // Get all historical messages
    }

    // Filter for sent messages with history
    const sentFilter = {
      kinds: [4],
      authors: [account.value.pubkey],
      since: 0 // Get all historical messages
    }

    const subscribeToRelay = (relay: any) => {
      return new Promise((resolve) => {
        let eoseCount = 0

        // Subscribe to received messages
        const receivedSub = relay.sub([receivedFilter])
        
        receivedSub.on('event', async (event: NostrEvent) => {
          try {
            // Skip if we've already processed this message
            if (processedMessageIds.value.has(event.id)) {
              return
            }

            const decrypted = await window.NostrTools.nip04.decrypt(
              account.value!.privkey,
              event.pubkey,
              event.content
            )

            const dm: DirectMessage = {
              id: event.id,
              pubkey: event.pubkey,
              content: decrypted,
              created_at: event.created_at,
              sent: false
            }

            await addMessage(event.pubkey, dm)

            // Load profile if not already loaded
            if (!profiles.value.has(event.pubkey)) {
              await loadProfiles()
            }
          } catch (err) {
            console.error('Failed to decrypt received message:', err)
          }
        })

        // Subscribe to sent messages
        const sentSub = relay.sub([sentFilter])
        
        sentSub.on('event', async (event: NostrEvent) => {
          try {
            // Skip if we've already processed this message
            if (processedMessageIds.value.has(event.id)) {
              return
            }

            // Find the target pubkey from the p tag
            const targetPubkey = event.tags.find(tag => tag[0] === 'p')?.[1]
            if (!targetPubkey) return

            const decrypted = await window.NostrTools.nip04.decrypt(
              account.value!.privkey,
              targetPubkey,
              event.content
            )

            const dm: DirectMessage = {
              id: event.id,
              pubkey: targetPubkey,
              content: decrypted,
              created_at: event.created_at,
              sent: true
            }

            await addMessage(targetPubkey, dm)
          } catch (err) {
            console.error('Failed to decrypt sent message:', err)
          }
        })

        // Listen for end of stored events
        receivedSub.on('eose', () => {
          eoseCount++
          if (eoseCount >= 2) { // Both subscriptions have finished
            resolve(true)
          }
        })

        sentSub.on('eose', () => {
          eoseCount++
          if (eoseCount >= 2) { // Both subscriptions have finished
            resolve(true)
          }
        })
      })
    }

    // Wait for all relays to load their historical messages
    await Promise.all(relayPool.value.map(relay => subscribeToRelay(relay)))
  }

  return {
    account,
    profiles,
    messages,
    activeChat,
    isLoggedIn,
    currentMessages,
    init,
    login,
    logout,
    sendMessage,
    subscribeToMessages
  }
})