import { create } from 'zustand'
import type { PeerInfo, NetworkInfo, ChatMessage, FileEntry, IpcMessage, PeerConnState, CandidateType } from '../types'

export interface PeerStatus {
  connState?: PeerConnState
  candidateType?: CandidateType
  remoteAddress?: string
  lastSeen?: number
}
import { DaemonAdapter } from '../adapter/daemon'
import { BrowserAdapter } from '../adapter/browser'

type AnyAdapter = DaemonAdapter | BrowserAdapter

interface WasteState {
  // connection
  adapter: AnyAdapter | null
  adapterMode: 'daemon' | 'browser' | null
  daemonStatus: 'disconnected' | 'connecting' | 'connected'

  // identity
  masterAlias: string | null
  masterId: string | null
  localPeer: PeerInfo | null

  // networks
  networks: NetworkInfo[]
  activeNetworkId: string | null

  // peers
  connectedPeers: PeerInfo[]

  // chat — keyed by room
  messages: Record<string, ChatMessage[]>
  // rooms for which we have received history: room → ts of last history message
  historyCutoff: Record<string, number>
  activeRoom: string
  // user-created rooms, keyed by networkId
  customRooms: Record<string, string[]>

  // file listings — keyed by peer id
  fileLists: Record<string, FileEntry[]>

  // per-peer connection status (browser mode) and last-seen timestamps
  peerStatus: Record<string, PeerStatus>

  // identity backup export result (cleared when consumed)
  exportedBackup: string | null

  // file browser state
  activeFilePeer: string | null
  // shared files keyed by networkId
  sharedFilesByNetwork: Record<string, Map<string, File>>
  // incoming offers awaiting accept/reject: xid → offer info
  pendingOffers: Record<string, { peerId: string; name: string; size: number }>
  // active in-progress transfers: xid → progress
  fileProgress: Record<string, { peerId: string; name: string; received: number; total: number }>

  // actions
  connect: (url: string) => void
  connectBrowser: () => void
  disconnect: () => void
  send: (msg: IpcMessage) => void
  setActiveNetwork: (id: string) => void
  setActiveRoom: (room: string) => void
  setActiveFilePeer: (peerId: string | null) => void
  setSharedFiles: (files: Map<string, File>, networkId?: string) => void
  browseFiles: (peerId: string) => void
  sendFileTo: (peerId: string, file: File) => void
  acceptOffer: (peerId: string, xid: string, name: string, size: number) => void
  rejectOffer: (peerId: string, xid: string) => void
  cancelTransfer: (peerId: string, xid: string, direction: 'recv' | 'send') => void
  createRoom: (name: string) => void
  logout: (clearIdentity: boolean) => void
  handleEvent: (msg: IpcMessage) => void
}

export const useWaste = create<WasteState>((set, get) => ({
  adapter: null,
  adapterMode: null,
  daemonStatus: 'disconnected',
  masterAlias: null,
  masterId: null,
  localPeer: null,
  networks: [],
  activeNetworkId: null,
  connectedPeers: [],
  messages: {},
  historyCutoff: {},
  activeRoom: 'general',
  customRooms: {},
  fileLists: {},
  exportedBackup: null,
  peerStatus: {},
  activeFilePeer: null,
  sharedFilesByNetwork: {},
  pendingOffers: {},
  fileProgress: {},

  connect(url: string) {
    const adapter = new DaemonAdapter(url)
    adapter.onStatusChange = (s) => set({ daemonStatus: s })
    adapter.on((msg) => get().handleEvent(msg))
    adapter.connect()
    set({ adapter, adapterMode: 'daemon' })
  },

  connectBrowser() {
    const adapter = new BrowserAdapter()
    adapter.onStatusChange = (s) => set({ daemonStatus: s })
    adapter.on((msg) => get().handleEvent(msg))
    adapter.connect()
    set({ adapter, adapterMode: 'browser' })
  },

  disconnect() {
    const a = get().adapter
    if (a instanceof DaemonAdapter) a.disconnect()
    else if (a instanceof BrowserAdapter) a.disconnect()
    set({ adapter: null, adapterMode: null, daemonStatus: 'disconnected' })
  },

  send(msg) {
    get().adapter?.send(msg)
  },

  setActiveNetwork(id) {
    set({ activeNetworkId: id })
  },

  setActiveRoom(room) {
    set({ activeRoom: room })
  },

  setActiveFilePeer(peerId) {
    set({ activeFilePeer: peerId })
  },

  setSharedFiles(files, networkId) {
    const netId = networkId ?? get().activeNetworkId ?? ''
    if (!netId) return
    set(s => ({ sharedFilesByNetwork: { ...s.sharedFilesByNetwork, [netId]: files } }))
    const a = get().adapter
    if (a instanceof BrowserAdapter) a.setSharedFiles(files)
  },

  sendFileTo(peerId, file) {
    const a = get().adapter
    if (a instanceof BrowserAdapter) a.sendFileTo(peerId, file)
  },

  acceptOffer(peerId, xid, name, size) {
    set(s => {
      const p = { ...s.pendingOffers }; delete p[xid]
      return { pendingOffers: p, fileProgress: { ...s.fileProgress, [xid]: { peerId, name, received: 0, total: size } } }
    })
    const a = get().adapter
    if (a instanceof BrowserAdapter) a.acceptOffer(peerId, xid, name, size)
  },

  rejectOffer(peerId, xid) {
    set(s => { const p = { ...s.pendingOffers }; delete p[xid]; return { pendingOffers: p } })
    const a = get().adapter
    if (a instanceof BrowserAdapter) a.rejectOffer(peerId, xid)
  },

  cancelTransfer(peerId, xid, direction) {
    set(s => {
      const fp = { ...s.fileProgress }; delete fp[xid]
      return { fileProgress: fp }
    })
    const a = get().adapter
    if (a instanceof BrowserAdapter) a.cancelTransfer(peerId, xid, direction)
  },

  logout(clearIdentity) {
    const a = get().adapter
    if (a instanceof DaemonAdapter) a.disconnect()
    else if (a instanceof BrowserAdapter) a.disconnect()
    localStorage.removeItem('waste_last_network')
    localStorage.removeItem('waste_nick')
    localStorage.removeItem('waste_anchor_url')
    if (clearIdentity) localStorage.removeItem('waste_seed')
    window.location.reload()
  },

  createRoom(name) {
    const netId = get().activeNetworkId
    if (!netId || !name.trim()) return
    const key = name.trim().toLowerCase().replace(/\s+/g, '-')
    set(s => {
      const existing = s.customRooms[netId] ?? []
      if (existing.includes(key)) return s
      return {
        customRooms: { ...s.customRooms, [netId]: [...existing, key] },
        activeRoom: key,
      }
    })
  },

  browseFiles(peerId) {
    const a = get().adapter
    if (a instanceof BrowserAdapter) {
      a.requestBrowse(peerId)
    } else {
      get().send({ type: 'get_file_list', peer_id: peerId as unknown as import('../types').PeerID })
    }
    set({ activeFilePeer: peerId })
  },

  handleEvent(msg) {
    switch (msg.type) {
      case 'state_snapshot': {
        const networks = msg.networks ?? []
        set({
          masterAlias: msg.master_alias ?? null,
          masterId: msg.master_id ?? null,
          localPeer: msg.local_peer ?? null,
          networks,
          connectedPeers: msg.connected_peers ?? [],
          activeNetworkId: networks[0]?.network_id ?? null,
        })
        break
      }
      case 'network_joined': {
        set(s => ({
          localPeer: s.localPeer ?? msg.local_peer ?? null,
          networks: s.networks.some(n => n.network_id === msg.network_id)
            ? s.networks
            : [...s.networks, {
                network_id: msg.network_id!,
                network_name: msg.network_name!,
                local_peer: msg.local_peer,
                share_dir: msg.share_dir,
              }],
          activeNetworkId: s.activeNetworkId ?? msg.network_id!,
        }))
        break
      }
      case 'network_left': {
        set(s => ({
          networks: s.networks.filter(n => n.network_id !== msg.network_id),
          activeNetworkId: s.activeNetworkId === msg.network_id
            ? (s.networks.find(n => n.network_id !== msg.network_id)?.network_id ?? null)
            : s.activeNetworkId,
        }))
        break
      }
      case 'peer_connected': {
        if (msg.peer) {
          set(s => ({
            connectedPeers: s.connectedPeers.some(p => p.id === msg.peer!.id)
              ? s.connectedPeers.map(p => p.id === msg.peer!.id ? { ...p, ...msg.peer } : p)
              : [...s.connectedPeers, msg.peer!],
          }))
        }
        break
      }
      case 'session_ready': {
        if (msg.peer_id && msg.nick) {
          set(s => ({
            connectedPeers: s.connectedPeers.map(p =>
              p.id === msg.peer_id ? { ...p, alias: msg.nick! } : p
            ),
          }))
        }
        break
      }
      case 'peer_disconnected': {
        set(s => ({
          connectedPeers: s.connectedPeers.filter(p => p.id !== msg.peer_id),
        }))
        break
      }
      case 'message_received': {
        if (msg.message) {
          const m = msg.message
          const room = m.room
          const fromId = String(m.from)
          set(s => {
            const existing = s.messages[room] ?? []
            if (m.mid && existing.some(e => e.mid === m.mid)) return s
            const prev = s.peerStatus[fromId] ?? {}
            return {
              messages: { ...s.messages, [room]: [...existing, m] },
              peerStatus: { ...s.peerStatus, [fromId]: { ...prev, lastSeen: m.ts } },
            }
          })
        }
        break
      }
      case 'peer_status': {
        const pid = String(msg.peer_id)
        set(s => {
          const prev = s.peerStatus[pid] ?? {}
          return {
            peerStatus: {
              ...s.peerStatus,
              [pid]: {
                ...prev,
                ...(msg.conn_state ? { connState: msg.conn_state } : {}),
                ...(msg.candidate_type ? { candidateType: msg.candidate_type } : {}),
                ...(msg.remote_address !== undefined ? { remoteAddress: msg.remote_address } : {}),
              },
            },
          }
        })
        break
      }
      case 'identity_exported': {
        if (msg.backup) set({ exportedBackup: msg.backup })
        break
      }
      case 'incoming_file': {
        if (msg.peer_id && msg.offer) {
          const { xid, name, size } = msg.offer
          set(s => ({ pendingOffers: { ...s.pendingOffers, [xid]: { peerId: String(msg.peer_id), name, size } } }))
        }
        break
      }
      case 'file_progress': {
        if (msg.transfer_id && msg.peer_id) {
          const xid = msg.transfer_id
          set(s => ({
            fileProgress: {
              ...s.fileProgress,
              [xid]: {
                peerId: String(msg.peer_id),
                name: msg.offer?.name ?? xid,
                received: msg.bytes_received ?? 0,
                total: msg.total_bytes ?? 0,
              },
            },
          }))
        }
        break
      }
      case 'file_list': {
        if (msg.peer_id && msg.files) {
          set(s => ({
            fileLists: { ...s.fileLists, [msg.peer_id!]: msg.files! },
          }))
        }
        break
      }
      case 'file_complete': {
        if (msg.path && msg.offer?.name) {
          // clear progress entry
          const xid = msg.offer.xid
          set(s => { const fp = { ...s.fileProgress }; delete fp[xid]; return { fileProgress: fp } })
          const a = document.createElement('a')
          a.href = msg.path
          a.download = msg.offer.name
          a.click()
        }
        break
      }
      case 'history_loaded': {
        const room = msg.room
        const incoming = (msg.messages ?? []) as ChatMessage[]
        if (!room || incoming.length === 0) break
        set(s => {
          const existing = s.messages[room] ?? []
          const existingMids = new Set(existing.map(m => m.mid).filter(Boolean))
          const fresh = incoming.filter(m => !m.mid || !existingMids.has(m.mid))
          if (fresh.length === 0) return s
          const merged = [...fresh, ...existing].sort((a, b) => a.ts - b.ts)
          const cutoff = fresh[fresh.length - 1]?.ts ?? 0
          return {
            messages: { ...s.messages, [room]: merged },
            historyCutoff: { ...s.historyCutoff, [room]: cutoff },
          }
        })
        break
      }
    }
  },
}))