import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import {
  askNode as apiAskNode,
  decideApproval,
  fetchAgents,
  fetchApprovals,
  fetchFeed,
  fetchGpu,
  fetchNodeDetail,
  fetchStatus,
  fetchTerminals,
  fetchWorkload,
  probeNode as apiProbeNode,
  sendPrompt as apiSendPrompt,
} from '../lib/api'
import { AGENT_NODE, NODE_ALIASES, wsUrl } from '../lib/constants'
import { resolveInfraNode } from '../lib/infraCatalog'
import type {
  Agent,
  AgentAnim,
  Approval,
  ChatMessage,
  FeedEntry,
  GpuStatus,
  NodeDetail,
  StatusData,
  TerminalLine,
  TopologyNode,
  WorkloadData,
} from '../types'

function resolveProbeId(nodeId: string) {
  const aliased = NODE_ALIASES[nodeId] || nodeId
  const infra = resolveInfraNode(nodeId) || resolveInfraNode(aliased)
  return infra?.id || aliased
}

export function useCommandCenter() {
  const [agents, setAgents] = useState<Agent[]>([])
  const [agentsLoading, setAgentsLoading] = useState(true)
  const [status, setStatus] = useState<StatusData | null>(null)
  const [workload, setWorkload] = useState<WorkloadData | null>(null)
  const [gpu, setGpu] = useState<GpuStatus | null>(null)
  const [feed, setFeed] = useState<FeedEntry[]>([])
  const [approvals, setApprovals] = useState<Approval[]>([])
  const [chat, setChat] = useState<ChatMessage[]>([])
  const [anims, setAnims] = useState<Record<string, AgentAnim>>({})
  const [selectedAgentId, setSelectedAgentId] = useState<string | null>(null)
  const [promptBusy, setPromptBusy] = useState(false)
  const [terminals, setTerminals] = useState<Record<string, TerminalLine[]>>({})
  const [selectedNodeId, setSelectedNodeId] = useState<string | null>(null)
  const [selectedNode, setSelectedNode] = useState<TopologyNode | null>(null)
  const [nodeDetail, setNodeDetail] = useState<NodeDetail | null>(null)
  const [nodeBusy, setNodeBusy] = useState(false)
  const [mainView, setMainView] = useState<'platform' | 'approvals' | 'presentation' | 'dataquality' | 'knowledge' | 'storage'>('platform')
  const [approvalHighlight, setApprovalHighlight] = useState(false)
  const [chatExpanded, setChatExpanded] = useState(false)
  const promptTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null)
  const [terminalExpanded, setTerminalExpanded] = useState(true)

  const appendTerminal = useCallback((line: TerminalLine) => {
    setTerminals((prev) => {
      const cur = prev[line.agent_id] || []
      return { ...prev, [line.agent_id]: [...cur, line].slice(-300) }
    })
  }, [])

  const selectedAgent = useMemo(
    () => agents.find((a) => a.id === selectedAgentId) || null,
    [agents, selectedAgentId],
  )

  const reloadFast = useCallback(async () => {
    const [a, s, f, ap, g, t] = await Promise.all([
      fetchAgents(),
      fetchStatus(),
      fetchFeed(),
      fetchApprovals(),
      fetchGpu(),
      fetchTerminals(),
    ])
    setAgents(a)
    setAgentsLoading(false)
    setStatus(s)
    setGpu(g || s?.gpu || null)
    setFeed(f)
    setApprovals(ap)
    setTerminals(t)
  }, [])

  const reloadWorkload = useCallback(async () => {
    const w = await fetchWorkload()
    if (w?.zones) setWorkload(w)
  }, [])

  const reload = useCallback(async () => {
    await reloadFast()
    reloadWorkload()
  }, [reloadFast, reloadWorkload])

  useEffect(() => {
    reloadFast().then(() => reloadWorkload())
    const ws = new WebSocket(wsUrl())
    ws.onmessage = (ev) => {
      const msg = JSON.parse(ev.data)
      if (msg.type === 'status') {
        setStatus(msg.data)
        if (msg.data.gpu) setGpu(msg.data.gpu)
      }
      if (msg.type === 'workload') setWorkload(msg.data)
      if (msg.type === 'terminal') appendTerminal(msg.line)
      if (msg.type === 'terminal_history' && msg.terminals) setTerminals(msg.terminals)
      if (msg.type === 'feed') setFeed((prev) => [msg.entry, ...prev].slice(0, 100))
      if (msg.type === 'agent_dispatch') {
        setSelectedAgentId(msg.agent_id)
        setAnims((p) => ({ ...p, [msg.agent_id]: { agentId: msg.agent_id, state: 'walk', zone: msg.zone } }))
      }
      if (msg.type === 'agent_fetch') {
        setAnims((p) => ({ ...p, [msg.agent_id]: { agentId: msg.agent_id, state: 'fetch', zone: msg.zone } }))
      }
      if (msg.type === 'agent_return') {
        setAnims((p) => ({ ...p, [msg.agent_id]: { agentId: msg.agent_id, state: 'return', zone: msg.zone } }))
        setTimeout(() => {
          setAnims((p) => ({ ...p, [msg.agent_id]: { agentId: msg.agent_id, state: 'idle' } }))
        }, 1200)
      }
      if (msg.type === 'prompt_result') {
        setChat((c) => [...c, { role: 'agent', text: msg.answer, agent: msg.agent_id, ts: new Date().toISOString() }])
        setPromptBusy(false)
        reloadFast()
      }
      if (msg.type === 'approval_new') {
        setApprovals((prev) => {
          if (prev.some((a) => a.id === msg.approval?.id)) return prev
          return [msg.approval, ...prev]
        })
        if (msg.approval?.status === 'pending') setApprovalHighlight(true)
      }
      if (msg.type === 'approval_update' && msg.approval) {
        setApprovals((prev) => prev.filter((a) => a.id !== msg.approval.id))
      }
      if (msg.type === 'node_ask_result') {
        setNodeBusy(false)
        if (msg.agent_id) setSelectedAgentId(msg.agent_id)
      }
    }
    const iv = setInterval(reloadFast, 15000)
    const wv = setInterval(reloadWorkload, 45000)
    return () => { ws.close(); clearInterval(iv); clearInterval(wv) }
  }, [reloadFast, reloadWorkload, appendTerminal])

  const findNodeStub = useCallback((nodeId: string): TopologyNode | null => {
    const resolved = NODE_ALIASES[nodeId] || nodeId
    const allNodes = [
      ...(workload?.topology?.nodes || []),
      ...Object.values(workload?.topologies || {}).flatMap((v) => v.nodes),
    ]
    const wn = allNodes.find((n) => n.id === nodeId) || allNodes.find((n) => n.id === resolved)
    if (wn) return wn

    const infra = resolveInfraNode(nodeId) || resolveInfraNode(resolved)
    if (infra) {
      return {
        id: infra.id,
        label: infra.label,
        vm: infra.vm,
        ip: infra.ip,
        x: 50,
        y: 50,
        color: infra.accent,
        level: 'ok',
        role: infra.description,
        apps: infra.apps.map((a) => ({ name: a.label, state: 'link', image: a.url, ports: a.port ? [a.port] : [] })),
        running: 1,
        total: 1,
      }
    }

    const agent = agents.find((a) => a.id === nodeId)
    if (agent) {
      return {
        id: agent.id, label: agent.name, vm: 'agent', ip: '10.0.21.33',
        x: 50, y: 50, color: agent.color, level: 'ok', role: agent.role, apps: [], running: 1, total: 1,
        agent_id: agent.id,
      }
    }
    const zone = workload?.zones.find((z) => z.id === nodeId || z.id === resolved)
    if (zone) {
      return {
        id: nodeId, label: zone.label, vm: zone.vm || zone.id, ip: zone.ip || '',
        x: 50, y: 50, color: zone.color, level: zone.level, role: 'zone', apps: zone.apps,
        running: zone.running, total: zone.total,
      }
    }
    return null
  }, [workload, agents])

  const probeNodeId = useCallback((nodeId: string) => {
    setNodeBusy(true)
    setTerminalExpanded(true)
    apiProbeNode(resolveProbeId(nodeId)).finally(() => setNodeBusy(false))
  }, [])

  const openTerminal = useCallback((nodeId: string) => {
    setTerminalExpanded(true)
    setSelectedNodeId(nodeId)
  }, [])

  const selectNode = useCallback(async (nodeId: string) => {
    const stub = findNodeStub(nodeId)
    if (!stub) return
    const probeId = resolveProbeId(nodeId)
    setSelectedNodeId(probeId)
    setSelectedNode({ ...stub, id: probeId })
    setNodeDetail(null)
    setTerminalExpanded(true)
    const infra = resolveInfraNode(nodeId)
    const linked = agents.find(
      (a) => a.id === nodeId || AGENT_NODE[a.id] === probeId || a.id === infra?.agentId,
    )
    if (linked) setSelectedAgentId(linked.id)
    try {
      const detail = await fetchNodeDetail(probeId)
      if (!detail.error) setNodeDetail(detail as NodeDetail)
    } catch { /* ok */ }
    probeNodeId(nodeId)
  }, [findNodeStub, agents, probeNodeId])

  const selectAgent = useCallback((id: string) => {
    setSelectedAgentId(id)
    setTerminalExpanded(true)
    const agent = agents.find((a) => a.id === id)
    if (!agent) return
    const nodeId = agent.supervisor ? id : (AGENT_NODE[id] || agent.zone)
    if (nodeId) {
      const stub = findNodeStub(nodeId)
      if (stub) {
        selectNode(nodeId)
        return
      }
    }
    setSelectedNodeId(null)
    setSelectedNode(null)
    setNodeDetail(null)
  }, [agents, findNodeStub, selectNode])

  const clearSelection = useCallback(() => {
    setSelectedNodeId(null)
    setSelectedNode(null)
    setNodeDetail(null)
    setSelectedAgentId(null)
  }, [])

  const probeNode = useCallback(() => {
    if (selectedNodeId) probeNodeId(selectedNodeId)
  }, [selectedNodeId, probeNodeId])

  const askNode = useCallback(async (message: string) => {
    if (!selectedNodeId) return
    setNodeBusy(true)
    setTerminalExpanded(true)
    await apiAskNode(resolveProbeId(selectedNodeId), message)
  }, [selectedNodeId])

  const sendPrompt = useCallback(async (message: string, agentId?: string) => {
    setPromptBusy(true)
    setChatExpanded(true)
    setChat((c) => [...c, { role: 'user', text: message, ts: new Date().toISOString() }])
    if (agentId) setSelectedAgentId(agentId)
    await apiSendPrompt(message, agentId)
  }, [])

  const decide = useCallback(async (id: string, approved: boolean, decidedBy = 'mo-commander', note = '') => {
    setApprovals((prev) => prev.filter((a) => a.id !== id))
    await decideApproval(id, approved, decidedBy, note)
    reloadFast()
  }, [reloadFast])

  const terminalSubjectId = selectedNodeId || selectedAgentId

  const inspectorLines = useMemo(() => {
    if (!terminalSubjectId) return []
    const probeId = resolveProbeId(terminalSubjectId)
    return terminals[probeId] || terminals[terminalSubjectId] || terminals[selectedAgentId || ''] || []
  }, [terminalSubjectId, terminals, selectedAgentId])

  const focusApprovals = useCallback(() => {
    setApprovalHighlight(true)
    setMainView('approvals')
  }, [])

  return {
    agents,
    agentsLoading,
    status,
    workload,
    gpu,
    feed,
    approvals,
    chat,
    anims,
    selectedAgentId,
    selectedAgent,
    promptBusy,
    selectedNodeId,
    selectedNode,
    nodeDetail,
    nodeBusy,
    mainView,
    setMainView,
    approvalHighlight,
    setApprovalHighlight,
    inspectorLines,
    terminalSubjectId,
    terminalExpanded,
    setTerminalExpanded,
    selectNode,
    selectAgent,
    clearSelection,
    probeNode,
    probeNodeId,
    openTerminal,
    askNode,
    sendPrompt,
    decide,
    focusApprovals,
    reload,
    chatExpanded,
    setChatExpanded,
  }
}