import { useEffect, useMemo, useState } from 'react'
import {
  INITIAL_KEY_MANAGEMENT_STATE,
  confirmReplace,
  copyToClipboard,
  handleImport,
  loadKeys,
  type KeyManagementManagerState,
  type PatchState,
} from './keyManagementController'

export interface KeyManagementManagerActions {
  onChangeImportKey: (value: string) => void
  onShowImportForm: () => void
  onCancelImport: () => void
  onImport: () => void
  onDismissReplaceWarning: () => void
  onConfirmReplace: () => void
  onCopyNpub: () => void
  onCopyPublicKey: () => void
  onCopyRecoveryPhrase: () => void
  onDoneRecovery: () => void
}

export interface UseKeyManagementManagerResult {
  state: KeyManagementManagerState
  actions: KeyManagementManagerActions
}

export function useKeyManagementManager(): UseKeyManagementManagerResult {
  const [state, setState] = useState<KeyManagementManagerState>(INITIAL_KEY_MANAGEMENT_STATE)
  const patchState = useMemo((): PatchState => createPatchState(setState), [])

  useEffect(() => {
    void loadKeys({ patchState })
  }, [patchState])

  const actions = useMemo((): KeyManagementManagerActions => createActions({ state, patchState }), [state, patchState])

  return { state, actions }
}

function createPatchState(setState: React.Dispatch<React.SetStateAction<KeyManagementManagerState>>): PatchState {
  return (patch: Partial<KeyManagementManagerState>): void => {
    setState((previous) => ({ ...previous, ...patch }))
  }
}

function createActions(params: { state: KeyManagementManagerState; patchState: PatchState }): KeyManagementManagerActions {
  return {
    onChangeImportKey: (value: string): void => {
      params.patchState({ importKey: value, error: null })
    },
    onShowImportForm: (): void => {
      params.patchState({ showImportForm: true, error: null })
    },
    onCancelImport: (): void => {
      params.patchState({ showImportForm: false, importKey: '', error: null, showReplaceWarning: false })
    },
    onImport: (): void => {
      void handleImport({ state: params.state, patchState: params.patchState })
    },
    onDismissReplaceWarning: (): void => {
      params.patchState({ showReplaceWarning: false })
    },
    onConfirmReplace: (): void => {
      void confirmReplace({ state: params.state, patchState: params.patchState })
    },
    onCopyNpub: (): void => {
      void copyNpub({ state: params.state, patchState: params.patchState })
    },
    onCopyPublicKey: (): void => {
      void copyPublicKey({ state: params.state, patchState: params.patchState })
    },
    onCopyRecoveryPhrase: (): void => {
      void copyRecoveryPhrase({ state: params.state, patchState: params.patchState })
    },
    onDoneRecovery: (): void => {
      params.patchState({ recoveryPhrase: null, newNpub: null })
      void loadKeys({ patchState: params.patchState })
    },
  }
}

async function copyNpub(params: { state: KeyManagementManagerState; patchState: PatchState }): Promise<void> {
  const npub = params.state.publicKeys?.npub
  if (!npub) {
    return
  }
  await copyToClipboard({
    text: npub,
    onCopied: () => {
      params.patchState({ copiedNpub: true })
      scheduleResetCopiedFlag(() => params.patchState({ copiedNpub: false }))
    },
    onCopyFailed: (e) => {
      console.error('[KeyManagement] Error copying npub:', e)
    },
  })
}

async function copyPublicKey(params: { state: KeyManagementManagerState; patchState: PatchState }): Promise<void> {
  const publicKey = params.state.publicKeys?.publicKey
  if (!publicKey) {
    return
  }
  await copyToClipboard({
    text: publicKey,
    onCopied: () => {
      params.patchState({ copiedPublicKey: true })
      scheduleResetCopiedFlag(() => params.patchState({ copiedPublicKey: false }))
    },
    onCopyFailed: (e) => {
      console.error('[KeyManagement] Error copying public key:', e)
    },
  })
}

async function copyRecoveryPhrase(params: { state: KeyManagementManagerState; patchState: PatchState }): Promise<void> {
  const {recoveryPhrase} = params.state
  if (!recoveryPhrase) {
    return
  }
  await copyToClipboard({
    text: recoveryPhrase.join(' '),
    onCopied: () => {
      params.patchState({ copiedRecoveryPhrase: true })
      scheduleResetCopiedFlag(() => params.patchState({ copiedRecoveryPhrase: false }))
    },
    onCopyFailed: (e) => {
      console.error('[KeyManagement] Error copying recovery phrase:', e)
    },
  })
}

function scheduleResetCopiedFlag(reset: () => void): void {
  setTimeout(() => {
    reset()
  }, 2000)
}