import { ref, computed, onUnmounted } from 'vue'
import { Accounts } from 'applesauce-accounts'
import { accountManager } from '../lib/accounts'
import { TEST_PERSONAS, TASTEMAKER_PERSONAS } from '../data/testPersonas'
import type { Subscription } from 'rxjs'

type Persona = { name: string; nsec: string; pubkey: string }

/**
 * Vue composable for Nostr account management.
 * Wraps applesauce AccountManager observables as Vue reactive refs.
 * Provides login methods for Extension, test personas, and private keys.
 */
export function useAccounts() {
  const activeAccount = ref<any>(null)
  const allAccounts = ref<any[]>([])
  const isLoggingIn = ref(false)
  const loginError = ref<string | null>(null)

  const subscriptions: Subscription[] = []

  // Subscribe to active account changes
  const activeSub = accountManager.active$.subscribe((account) => {
    activeAccount.value = account ?? null
  })
  subscriptions.push(activeSub)

  // Subscribe to all accounts changes
  const accountsSub = accountManager.accounts$.subscribe((accounts) => {
    allAccounts.value = [...accounts]
  })
  subscriptions.push(accountsSub)

  const isLoggedIn = computed(() => activeAccount.value !== null)
  const activePubkey = computed(() => activeAccount.value?.pubkey ?? null)

  const activeName = computed(() => {
    if (!activeAccount.value) return null
    // Check test personas for name
    const allPersonas: Persona[] = [
      ...(TEST_PERSONAS as unknown as Persona[]),
      ...(TASTEMAKER_PERSONAS as unknown as Persona[]),
    ]
    const match = allPersonas.find(
      (p) => p.pubkey === activeAccount.value?.pubkey,
    )
    return match?.name ?? activeAccount.value?.pubkey?.slice(0, 8) ?? 'Unknown'
  })

  /**
   * Login with a browser extension (NIP-07)
   */
  async function loginWithExtension() {
    isLoggingIn.value = true
    loginError.value = null
    try {
      const account = await Accounts.ExtensionAccount.fromExtension()
      accountManager.addAccount(account)
      accountManager.setActive(account)
    } catch (err: any) {
      loginError.value = err.message || 'Extension login failed'
      console.error('Extension login error:', err)
    } finally {
      isLoggingIn.value = false
    }
  }

  /**
   * Login with a test persona (for development)
   */
  async function loginWithPersona(persona: Persona) {
    isLoggingIn.value = true
    loginError.value = null
    try {
      const account = Accounts.PrivateKeyAccount.fromKey(persona.nsec)
      accountManager.addAccount(account)
      accountManager.setActive(account)
    } catch (err: any) {
      loginError.value = err.message || 'Persona login failed'
      console.error('Persona login error:', err)
    } finally {
      isLoggingIn.value = false
    }
  }

  /**
   * Login with a private key (nsec)
   */
  async function loginWithPrivateKey(nsec: string) {
    isLoggingIn.value = true
    loginError.value = null
    try {
      const account = Accounts.PrivateKeyAccount.fromKey(nsec)
      accountManager.addAccount(account)
      accountManager.setActive(account)
    } catch (err: any) {
      loginError.value = err.message || 'Private key login failed'
      console.error('Private key login error:', err)
    } finally {
      isLoggingIn.value = false
    }
  }

  /**
   * Logout current account
   */
  function logout() {
    const current = accountManager.active
    if (current) {
      accountManager.removeAccount(current)
    }
    accountManager.setActive(null as any)
  }

  /**
   * Get all available test personas
   */
  const testPersonas = computed(() => [
    ...(TEST_PERSONAS as unknown as Persona[]),
  ])

  const tastemakerPersonas = computed(() => [
    ...(TASTEMAKER_PERSONAS as unknown as Persona[]),
  ])

  // Cleanup on unmount
  onUnmounted(() => {
    subscriptions.forEach((sub) => sub.unsubscribe())
  })

  return {
    // State
    activeAccount,
    allAccounts,
    isLoggedIn,
    isLoggingIn,
    loginError,
    activePubkey,
    activeName,

    // Login methods
    loginWithExtension,
    loginWithPersona,
    loginWithPrivateKey,
    logout,

    // Personas for dev UI
    testPersonas,
    tastemakerPersonas,
  }
}