/**
 * 底部 panel：左侧垂直 tab 切换四个内容区。
 *
 * - tab 1 「工单」：现有 IssueDetailPanel（基于 PropertyGrid）
 * - tab 2 「Profile」：工作区 KV 表 ProfileGrid
 * - tab 3 「会话」：ManagedSessionsPanel
 * - tab 4 「改动」：PrFilesPanel
 *
 * 四个内容始终挂载，非当前用 hidden 隐藏，避免切 tab 卸载导致阅读态（选中文件、
 * 树滚动/折叠、diff scroll）丢失。tab 状态用 useState，无持久化；激活态加左侧 2px 高亮条。
 */

import type { ClaudeProfile } from '../hooks/useIssues'
import type { ProfilesData, SessionHandoffPendingItem } from '../lib/messages'
import type { Issue, ManagedSessionsData } from '../types'
import { ClipboardList, FileDiff, Layers, MessagesSquare } from 'lucide-react'
import { useState } from 'react'
import { IssueDetailPanel } from './IssueDetailPanel'
import { ManagedSessionsPanel } from './ManagedSessionsPanel'
import { PrFilesPanel } from './PrFilesPanel'
import { ProfileGrid } from './ProfileGrid'

type TabKey = 'issue' | 'profile' | 'sessions' | 'changes'

interface BottomTabsProps {
  // Issue tab props (pass-through to IssueDetailPanel)
  issue: Issue | null
  allIssues: Issue[]
  globalAutoReview: boolean
  onOpenInBrowser: (url: string) => void
  onResumeSession: (sessionId: string, kind: 'implement' | 'brainstorm', profilePath?: string, cwd?: string, issueNumber?: number) => void
  onResumeReviewSession: (sessionId: string, issueNumber: number, cwd?: string) => void
  onStartTestSession: (issueNumber: number) => void
  onResumeTestSession: (sessionId: string, issueNumber: number, cwd?: string) => void
  onOpenFile: (path: string) => void
  onImplement: (issueNumber: number, planFile: string, profilePath?: string, sessionId?: string) => void
  onOpenPr: (pr: string) => void
  onGeneratePrDiffSummary: (issueNumber: number) => void
  isPrDiffSummaryRunning: (issueNumber: number) => boolean
  onOpenWorktree: (path: string) => void
  onDeleteWorktree: (issueNumber: number, path: string) => void
  onMergeBranch: (issueNumber: number, branch: string) => void
  onDeleteIssue?: (issueNumber: number) => void
  onCloseIssue: (issueNumber: number) => void
  onResetToTodo: (issueNumber: number) => void
  onCloseSessionTab: (issueNumber: number, kind: 'brainstorm' | 'implement' | 'review' | 'test') => void
  onContinueBrainstorm: (issueNumber: number) => void
  onUpdateAutoReview: (issueNumber: number, value: boolean) => void
  onUpdateProfilePath: (issueNumber: number, profilePath: string) => void
  onUpdateBrainstormProfilePath: (issueNumber: number, brainstormProfilePath: string) => void
  onUpdateTestProfilePath: (issueNumber: number, testProfilePath: string) => void
  onOpenLogs: () => void
  me?: string
  /** Gitea login → 头像 data URI。 */
  avatars?: Record<string, string>
  onStartHandoff: (issueNumber: number) => void
  onAcceptHandoff: (issueNumber: number) => void
  isHandoffRunning: (issueNumber: number) => boolean

  // Profile tab props
  profileData: ProfilesData
  onProfileSave: (next: ProfilesData) => void
  onProfileOpen: (value: string) => void

  // 会话管理 tab props
  managedSessions: ManagedSessionsData
  profiles: ClaudeProfile[]
  onManagedSessionCreate: (profilePath: string, name?: string, prompt?: string) => void
  onManagedSessionRename: (id: string, name: string) => void
  onManagedSessionResume: (id: string, profilePath?: string) => void
  onManagedSessionDelete: (id: string) => void
  onManagedSessionCloseTab: (id: string) => void
  importableSessions: Array<{ id: string, name: string, mtimeMs: number }>
  importableLoading: boolean
  onListImportableSessions: () => void
  onImportNamedSession: (sessionId: string, name: string) => void
  pendingHandoffs: SessionHandoffPendingItem[]
  onSessionHandoff: (sessionId: string) => void
  onAcceptSessionHandoff: (attachmentId: number) => void
}

export function BottomTabs(props: BottomTabsProps) {
  const [tab, setTab] = useState<TabKey>('issue')

  return (
    <div className="flex h-full w-full bg-[var(--vscode-editor-background)]">
      {/* 左侧垂直 tab 栏 */}
      <div className="flex w-9 shrink-0 flex-col items-stretch border-r border-[var(--vscode-panel-border)] bg-[var(--vscode-sideBar-background,var(--vscode-editor-background))]">
        <TabButton
          active={tab === 'issue'}
          onClick={() => setTab('issue')}
          icon={<ClipboardList className="size-4" />}
          title="工单"
        />
        <TabButton
          active={tab === 'profile'}
          onClick={() => setTab('profile')}
          icon={<Layers className="size-4" />}
          title="Profile"
        />
        <TabButton
          active={tab === 'sessions'}
          onClick={() => setTab('sessions')}
          icon={<MessagesSquare className="size-4" />}
          title="会话"
          badge={props.pendingHandoffs.length}
        />
        <TabButton
          active={tab === 'changes'}
          onClick={() => setTab('changes')}
          icon={<FileDiff className="size-4" />}
          title="改动"
        />
      </div>

      {/* 右侧内容：始终挂载，非当前 hidden，保留阅读态 */}
      <div className="relative min-w-0 flex-1 overflow-hidden">
        <div
          className={`h-full w-full ${tab === 'issue' ? '' : 'hidden'}`}
          aria-hidden={tab !== 'issue'}
          inert={tab !== 'issue' ? true : undefined}
        >
          <IssueDetailPanel
            issue={props.issue}
            allIssues={props.allIssues}
            globalAutoReview={props.globalAutoReview}
            onOpenInBrowser={props.onOpenInBrowser}
            onResumeSession={props.onResumeSession}
            onResumeReviewSession={props.onResumeReviewSession}
            onStartTestSession={props.onStartTestSession}
            onResumeTestSession={props.onResumeTestSession}
            onOpenFile={props.onOpenFile}
            onImplement={props.onImplement}
            onOpenPr={props.onOpenPr}
            onGeneratePrDiffSummary={props.onGeneratePrDiffSummary}
            isPrDiffSummaryRunning={props.isPrDiffSummaryRunning}
            onOpenWorktree={props.onOpenWorktree}
            onDeleteWorktree={props.onDeleteWorktree}
            onMergeBranch={props.onMergeBranch}
            onDeleteIssue={props.onDeleteIssue}
            onCloseIssue={props.onCloseIssue}
            onResetToTodo={props.onResetToTodo}
            onCloseSessionTab={props.onCloseSessionTab}
            onContinueBrainstorm={props.onContinueBrainstorm}
            onUpdateAutoReview={props.onUpdateAutoReview}
            onUpdateProfilePath={props.onUpdateProfilePath}
            onUpdateBrainstormProfilePath={props.onUpdateBrainstormProfilePath}
            onUpdateTestProfilePath={props.onUpdateTestProfilePath}
            profiles={props.profiles}
            onOpenLogs={props.onOpenLogs}
            me={props.me}
            avatars={props.avatars}
            onStartHandoff={props.onStartHandoff}
            onAcceptHandoff={props.onAcceptHandoff}
            isHandoffRunning={props.isHandoffRunning}
          />
        </div>
        <div
          className={`h-full w-full ${tab === 'profile' ? '' : 'hidden'}`}
          aria-hidden={tab !== 'profile'}
          inert={tab !== 'profile' ? true : undefined}
        >
          <ProfileGrid
            data={props.profileData}
            onSave={props.onProfileSave}
            onOpen={props.onProfileOpen}
          />
        </div>
        <div
          className={`h-full w-full ${tab === 'sessions' ? '' : 'hidden'}`}
          aria-hidden={tab !== 'sessions'}
          inert={tab !== 'sessions' ? true : undefined}
        >
          <ManagedSessionsPanel
            data={props.managedSessions}
            profiles={props.profiles}
            onCreate={props.onManagedSessionCreate}
            onRename={props.onManagedSessionRename}
            onResume={props.onManagedSessionResume}
            onDelete={props.onManagedSessionDelete}
            onCloseTab={props.onManagedSessionCloseTab}
            importableSessions={props.importableSessions}
            importableLoading={props.importableLoading}
            onListImportable={props.onListImportableSessions}
            onImport={props.onImportNamedSession}
            pendingHandoffs={props.pendingHandoffs}
            onHandoff={props.onSessionHandoff}
            onAcceptHandoff={props.onAcceptSessionHandoff}
          />
        </div>
        <div
          className={`h-full w-full ${tab === 'changes' ? '' : 'hidden'}`}
          aria-hidden={tab !== 'changes'}
          inert={tab !== 'changes' ? true : undefined}
        >
          <PrFilesPanel issue={props.issue} />
        </div>
      </div>
    </div>
  )
}

interface TabButtonProps {
  active: boolean
  onClick: () => void
  icon: React.ReactNode
  title: string
  badge?: number
}

function TabButton({ active, onClick, icon, title, badge }: TabButtonProps) {
  return (
    <button
      type="button"
      onClick={onClick}
      title={title}
      aria-label={title}
      aria-pressed={active}
      className={`relative flex h-9 w-full items-center justify-center transition-colors ${
        active
          ? 'text-[var(--vscode-foreground)]'
          : 'text-[var(--vscode-descriptionForeground)] hover:text-[var(--vscode-foreground)]'
      }`}
    >
      {active && (
        <span className="absolute left-0 top-0 h-full w-[2px] bg-[var(--vscode-focusBorder)]" />
      )}
      {icon}
      {badge != null && badge > 0 && (
        <span className="absolute right-0.5 top-0.5 min-w-[14px] rounded-full bg-[var(--vscode-activityBarBadge-background)] px-0.5 text-center text-[9px] leading-[14px] text-[var(--vscode-activityBarBadge-foreground)]">
          {badge > 9 ? '9+' : badge}
        </span>
      )}
    </button>
  )
}