import { useRef, useState } from 'react'
import { ChevronDown, ChevronUp } from 'lucide-react'
import { useClock } from './hooks/useClock'
import { useCommandCenter } from './hooks/useCommandCenter'
import { useLiveMetrics } from './hooks/useLiveMetrics'
import { SideNav } from './components/layout/SideNav'
import { TopBar } from './components/layout/TopBar'
import { AgentFleet } from './components/features/AgentFleet'
import { ApprovalInbox } from './components/features/ApprovalInbox'
import { ChatDrawer } from './components/features/ChatDrawer'
import { GpuMonitor } from './components/features/GpuMonitor'
import { InfraQuickAccess } from './components/features/InfraQuickAccess'
import { InspectorPanel } from './components/features/InspectorPanel'
import { PlatformTopology } from './components/features/PlatformTopology'
import { PresentationView } from './components/features/PresentationView'
import { DataQualityView } from './components/features/DataQualityView'
import { KnowledgeChatView } from './components/features/KnowledgeChatView'
import { StorageView } from './components/features/StorageView'
import { HdfsView } from './components/features/HdfsView'
import { SearchView } from './components/features/SearchView'
import { SshTerminal } from './components/features/SshTerminal'
import { TerminalDock } from './components/features/TerminalDock'
import { WorkbenchPanel } from './components/features/WorkbenchPanel'
import { resolveInfraNode } from './lib/infraCatalog'
import { cn } from './lib/utils'

export default function App() {
  const clock = useClock()
  const cc = useCommandCenter()
  const [gpuChatActive, setGpuChatActive] = useState(false)
  const [infraOpen, setInfraOpen] = useState(false)
  const [sshOpen, setSshOpen] = useState(false)
  const gpuBoost = gpuChatActive || cc.mainView === 'knowledge'
  const { agentLoads, gpuLive } = useLiveMetrics(cc.agents, cc.gpu, cc.anims, gpuBoost)
  const mainScrollRef = useRef<HTMLDivElement>(null)

  const isPlatform = cc.mainView === 'platform'

  const openApprovals = () => {
    cc.setMainView('approvals')
    mainScrollRef.current?.scrollTo({ top: 0, behavior: 'smooth' })
  }

  const terminalSubject = cc.terminalSubjectId
  const terminalLabel = (() => {
    if (cc.selectedAgent) return cc.selectedAgent.name.split(' ·')[0]
    const infra = resolveInfraNode(terminalSubject)
    if (infra) return infra.label
    if (cc.selectedNode) return cc.selectedNode.label
    return 'Lab'
  })()

  return (
    <div className="flex h-full flex-col overflow-hidden bg-surface">
      <TopBar
        clock={clock}
        status={cc.status}
        workload={cc.workload}
        agents={cc.agents}
        approvals={cc.approvals}
        onApprovalsClick={openApprovals}
      />

      <div className="flex min-h-0 flex-1 overflow-hidden">
        <SideNav
          workload={cc.workload}
          gpu={cc.gpu}
          gpuLive={gpuLive}
          gpuBoost={gpuBoost}
          selectedNodeId={cc.selectedNodeId}
          mainView={cc.mainView}
          approvalCount={cc.approvals.length}
          onSetMainView={cc.setMainView}
          onOpenApprovals={openApprovals}
          onSelectZone={cc.selectNode}
          onOpenSsh={() => setSshOpen(true)}
        />

        <div ref={mainScrollRef} className={cn('flex min-h-0 min-w-0 flex-1 flex-col bg-surface', isPlatform ? 'overflow-hidden' : 'scrollbar-thin overflow-y-auto')}>
          <div className={cn('flex min-h-0 flex-1', isPlatform ? '' : 'flex-col')}>
            <div className={cn('flex min-h-0 min-w-0 flex-1 flex-col', isPlatform ? 'gap-1 overflow-hidden p-1.5' : 'min-h-0 gap-2 p-3')}>
              {isPlatform && (
                <>
                  <div className="grid shrink-0 grid-cols-1 gap-2 xl:grid-cols-[1fr_auto]">
                    <AgentFleet
                      agents={cc.agents}
                      animations={cc.anims}
                      selectedId={cc.selectedAgentId}
                      loads={agentLoads}
                      approvalCount={cc.approvals.length}
                      onSelect={cc.selectAgent}
                      onOpenApprovals={openApprovals}
                    />
                    <GpuMonitor gpu={cc.gpu} live={gpuLive} />
                  </div>
                  <button
                    type="button"
                    onClick={() => setInfraOpen((v) => !v)}
                    className="flex shrink-0 items-center gap-1 self-start rounded border border-border/60 px-2 py-0.5 text-[9px] text-foreground-muted hover:border-docker/30 hover:text-docker"
                  >
                    {infraOpen ? <ChevronUp className="h-3 w-3" /> : <ChevronDown className="h-3 w-3" />}
                    Infrastructure & Apps
                  </button>
                  {infraOpen && (
                    <InfraQuickAccess
                      workload={cc.workload}
                      agents={cc.agents}
                      selectedNodeId={cc.selectedNodeId}
                      busy={cc.nodeBusy}
                      onSelectNode={cc.selectNode}
                      onSelectAgent={cc.selectAgent}
                      onProbe={cc.probeNodeId}
                      onOpenTerminal={cc.openTerminal}
                    />
                  )}
                </>
              )}

              <div className={cn('flex min-h-0 flex-col', isPlatform ? 'min-h-0 flex-1 overflow-hidden' : 'min-h-0 flex-1')}>
                {cc.mainView === 'platform' ? (
                  <PlatformTopology
                    workload={cc.workload}
                    animations={cc.anims}
                    selectedNodeId={cc.selectedNodeId}
                    onNodeClick={cc.selectNode}
                  />
                ) : cc.mainView === 'presentation' ? (
                  <PresentationView />
                ) : cc.mainView === 'dataquality' ? (
                  <DataQualityView />
                ) : cc.mainView === 'knowledge' ? (
                  <KnowledgeChatView onGpuActivity={setGpuChatActive} />
                ) : cc.mainView === 'storage' ? (
                  <StorageView />
                ) : cc.mainView === 'hdfs' ? (
                  <HdfsView />
                ) : cc.mainView === 'search' ? (
                  <SearchView />
                ) : (
                  <ApprovalInbox agents={cc.agents} livePending={cc.approvals} onDecide={cc.decide} />
                )}
              </div>

              {isPlatform && cc.workbenchMode && (
                <WorkbenchPanel
                  mode={cc.workbenchMode}
                  agent={cc.selectedAgent}
                  lines={cc.inspectorLines}
                  busy={cc.nodeBusy || cc.promptBusy}
                  onSendPrompt={cc.sendPrompt}
                />
              )}
            </div>

            {isPlatform && (
              <div className="flex w-[280px] shrink-0 flex-col border-l border-border">
                <InspectorPanel
                  node={cc.selectedNode}
                  nodeDetail={cc.nodeDetail}
                  agent={cc.selectedAgent}
                  agents={cc.agents}
                  workload={cc.workload}
                  gpu={cc.gpu}
                  feed={cc.feed}
                  lines={cc.inspectorLines}
                  busy={cc.nodeBusy}
                  onProbe={cc.probeNode}
                  onAsk={cc.askNode}
                  onSelectAgent={cc.selectAgent}
                  onSendPrompt={cc.sendPrompt}
                  onClear={cc.clearSelection}
                  onOpenTerminal={cc.openTerminal}
                  onProbeNodeId={cc.probeNodeId}
                />
                {!cc.workbenchMode && (
                  <TerminalDock
                    subjectId={terminalSubject}
                    subjectLabel={terminalLabel}
                    lines={cc.inspectorLines}
                    busy={cc.nodeBusy || cc.promptBusy}
                    expanded={cc.terminalExpanded}
                    onToggle={() => cc.setTerminalExpanded(!cc.terminalExpanded)}
                  />
                )}
              </div>
            )}
          </div>
        </div>
      </div>

      <ChatDrawer
        expanded={cc.chatExpanded}
        onToggle={() => cc.setChatExpanded(!cc.chatExpanded)}
        chat={cc.chat}
        feed={cc.feed}
        agents={cc.agents}
        approvals={cc.approvals}
        selectedAgent={cc.selectedAgent}
        promptBusy={cc.promptBusy}
        approvalHighlight={cc.approvalHighlight}
        filterAgentId={cc.selectedAgentId}
        onSendPrompt={cc.sendPrompt}
        onDecide={cc.decide}
        onDismissHighlight={() => cc.setApprovalHighlight(false)}
      />

      <SshTerminal open={sshOpen} onClose={() => setSshOpen(false)} />
    </div>
  )
}