import { useState, useRef, useEffect } from 'react'
import { Package, RefreshCw, Sparkles, FileText, Bell, Settings, FolderOpen, Check, Github, CircleDot, AlertTriangle, Loader2, GitCommitHorizontal } from 'lucide-react'
import type { LastCommitInfo, SyncStatus } from '../types'
import { openExternalUrl } from '../utils/url'

export interface VaultOption {
  label: string
  path: string
}

interface StatusBarProps {
  noteCount: number
  modifiedCount?: number
  vaultPath: string
  vaults: VaultOption[]
  onSwitchVault: (path: string) => void
  onOpenSettings?: () => void
  onOpenLocalFolder?: () => void
  onConnectGitHub?: () => void
  onClickPending?: () => void
  hasGitHub?: boolean
  syncStatus?: SyncStatus
  lastSyncTime?: number | null
  conflictCount?: number
  lastCommitInfo?: LastCommitInfo | null
  onTriggerSync?: () => void
  zoomLevel?: number
  onZoomReset?: () => void
}

function VaultMenuItem({ vault, isActive, onSelect }: { vault: VaultOption; isActive: boolean; onSelect: () => void }) {
  return (
    <div
      role="button" onClick={onSelect}
      style={{
        display: 'flex', alignItems: 'center', gap: 6, padding: '4px 8px', borderRadius: 4, cursor: 'pointer',
        background: isActive ? 'var(--hover)' : 'transparent',
        color: isActive ? 'var(--foreground)' : 'var(--muted-foreground)', fontSize: 12,
      }}
      onMouseEnter={(e) => { if (!isActive) e.currentTarget.style.background = 'var(--hover)' }}
      onMouseLeave={(e) => { if (!isActive) e.currentTarget.style.background = 'transparent' }}
    >
      {isActive ? <Check size={12} /> : <span style={{ width: 12 }} />}
      {vault.label}
    </div>
  )
}

function VaultMenu({ vaults, vaultPath, onSwitchVault, onOpenLocalFolder, onConnectGitHub, hasGitHub }: { vaults: VaultOption[]; vaultPath: string; onSwitchVault: (path: string) => void; onOpenLocalFolder?: () => void; onConnectGitHub?: () => void; hasGitHub?: boolean }) {
  const [open, setOpen] = useState(false)
  const menuRef = useRef<HTMLDivElement>(null)
  const activeVault = vaults.find((v) => v.path === vaultPath)

  useEffect(() => {
    if (!open) return
    const handleClick = (e: MouseEvent) => {
      if (menuRef.current && !menuRef.current.contains(e.target as Node)) setOpen(false)
    }
    document.addEventListener('mousedown', handleClick)
    return () => document.removeEventListener('mousedown', handleClick)
  }, [open])

  return (
    <div ref={menuRef} style={{ position: 'relative' }}>
      <span role="button" onClick={() => setOpen((v) => !v)} style={{ display: 'flex', alignItems: 'center', gap: 4, cursor: 'pointer', padding: '2px 4px', borderRadius: 3, background: open ? 'var(--hover)' : 'transparent' }} title="Switch vault">
        <FolderOpen size={13} />
        {activeVault?.label ?? 'Vault'}
      </span>
      {open && (
        <div style={{ position: 'absolute', bottom: '100%', left: 0, marginBottom: 4, background: 'var(--sidebar)', border: '1px solid var(--border)', borderRadius: 6, padding: 4, minWidth: 200, boxShadow: '0 4px 12px rgba(0,0,0,0.3)', zIndex: 1000 }}>
          {vaults.map((v) => <VaultMenuItem key={v.path} vault={v} isActive={v.path === vaultPath} onSelect={() => { onSwitchVault(v.path); setOpen(false) }} />)}
          <div style={{ height: 1, background: 'var(--border)', margin: '4px 0' }} />
          {onOpenLocalFolder && (
            <div
              role="button"
              onClick={() => { onOpenLocalFolder(); setOpen(false) }}
              style={{
                display: 'flex', alignItems: 'center', gap: 6, padding: '4px 8px', borderRadius: 4,
                cursor: 'pointer', background: 'transparent',
                color: 'var(--muted-foreground)', fontSize: 12,
              }}
              onMouseEnter={e => { e.currentTarget.style.background = 'var(--hover)' }}
              onMouseLeave={e => { e.currentTarget.style.background = 'transparent' }}
              data-testid="vault-menu-open-local"
            >
              <FolderOpen size={12} />
              Open local folder
            </div>
          )}
          {onConnectGitHub && (
            <div
              role="button"
              onClick={() => { onConnectGitHub(); setOpen(false) }}
              style={{
                display: 'flex', alignItems: 'center', gap: 6, padding: '4px 8px', borderRadius: 4,
                cursor: 'pointer', background: 'transparent',
                color: hasGitHub ? 'var(--muted-foreground)' : 'var(--accent-blue)', fontSize: 12,
              }}
              onMouseEnter={e => { e.currentTarget.style.background = 'var(--hover)' }}
              onMouseLeave={e => { e.currentTarget.style.background = 'transparent' }}
              data-testid="vault-menu-connect-github"
            >
              <Github size={12} />
              Connect GitHub repo
            </div>
          )}
        </div>
      )}
    </div>
  )
}

const ICON_STYLE = { display: 'flex', alignItems: 'center', gap: 4 } as const
const DISABLED_STYLE = { display: 'flex', alignItems: 'center', opacity: 0.4, cursor: 'not-allowed' } as const
const SEP_STYLE = { color: 'var(--border)' } as const
const SYNC_ICON_MAP: Record<string, typeof RefreshCw> = { syncing: Loader2, conflict: AlertTriangle }

function formatSyncLabel(status: SyncStatus, lastSyncTime: number | null): string {
  if (status === 'syncing') return 'Syncing…'
  if (status === 'conflict') return 'Conflict'
  if (status === 'error') return 'Sync failed'
  if (!lastSyncTime) return 'Not synced'
  const elapsed = Math.round((Date.now() - lastSyncTime) / 1000)
  if (elapsed < 60) return 'Synced just now'
  const mins = Math.floor(elapsed / 60)
  return `Synced ${mins}m ago`
}

function syncIconColor(status: SyncStatus): string {
  if (status === 'conflict') return 'var(--accent-orange)'
  if (status === 'error') return 'var(--muted-foreground)'
  return 'var(--accent-green)'
}

function CommitBadge({ info }: { info: LastCommitInfo }) {
  if (info.commitUrl) {
    return (
      <span
        role="button"
        onClick={() => openExternalUrl(info.commitUrl!)}
        style={{ ...ICON_STYLE, color: 'var(--muted-foreground)', textDecoration: 'none', cursor: 'pointer', padding: '2px 4px', borderRadius: 3 }}
        title={`Open commit ${info.shortHash} on GitHub`}
        data-testid="status-commit-link"
        onMouseEnter={e => { e.currentTarget.style.color = 'var(--foreground)' }}
        onMouseLeave={e => { e.currentTarget.style.color = 'var(--muted-foreground)' }}
      >
        <GitCommitHorizontal size={13} />{info.shortHash}
      </span>
    )
  }
  return (
    <span style={ICON_STYLE} data-testid="status-commit-hash">
      <GitCommitHorizontal size={13} />{info.shortHash}
    </span>
  )
}

export function StatusBar({ noteCount, modifiedCount = 0, vaultPath, vaults, onSwitchVault, onOpenSettings, onOpenLocalFolder, onConnectGitHub, onClickPending, hasGitHub, syncStatus = 'idle', lastSyncTime = null, conflictCount = 0, lastCommitInfo, onTriggerSync, zoomLevel = 100, onZoomReset }: StatusBarProps) {
  // Force re-render every 30s to keep relative time label fresh
  const [, setTick] = useState(0)
  useEffect(() => {
    const id = setInterval(() => setTick((t) => t + 1), 30_000)
    return () => clearInterval(id)
  }, [])

  const syncLabel = formatSyncLabel(syncStatus, lastSyncTime)
  const SyncIcon = SYNC_ICON_MAP[syncStatus] ?? RefreshCw

  return (
    <footer style={{ height: 30, flexShrink: 0, display: 'flex', alignItems: 'center', justifyContent: 'space-between', background: 'var(--sidebar)', borderTop: '1px solid var(--border)', padding: '0 8px', fontSize: 11, color: 'var(--muted-foreground)' }}>
      <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
        <VaultMenu vaults={vaults} vaultPath={vaultPath} onSwitchVault={onSwitchVault} onOpenLocalFolder={onOpenLocalFolder} onConnectGitHub={onConnectGitHub} hasGitHub={hasGitHub} />
        <span style={SEP_STYLE}>|</span>
        <span style={ICON_STYLE}><Package size={13} />v0.4.2</span>
        <span style={SEP_STYLE}>|</span>
        <span
          role="button"
          onClick={onTriggerSync}
          style={{ ...ICON_STYLE, cursor: onTriggerSync ? 'pointer' : 'default', padding: '2px 4px', borderRadius: 3 }}
          title={syncStatus === 'syncing' ? 'Syncing…' : 'Click to sync now'}
          data-testid="status-sync"
        >
          <SyncIcon size={13} style={{ color: syncIconColor(syncStatus) }} className={syncStatus === 'syncing' ? 'animate-spin' : ''} />{syncLabel}
        </span>
        {lastCommitInfo && <CommitBadge info={lastCommitInfo} />}
        {conflictCount > 0 && (
          <>
            <span style={SEP_STYLE}>|</span>
            <span style={{ ...ICON_STYLE, color: 'var(--destructive, #e03e3e)' }} data-testid="status-conflict-count">
              <AlertTriangle size={13} />{conflictCount} conflict{conflictCount > 1 ? 's' : ''}
            </span>
          </>
        )}
        {modifiedCount > 0 && (
          <>
            <span style={SEP_STYLE}>|</span>
            <span
              role="button"
              onClick={onClickPending}
              style={{ ...ICON_STYLE, cursor: 'pointer', padding: '2px 4px', borderRadius: 3, background: 'transparent' }}
              title="View pending changes"
              onMouseEnter={e => { e.currentTarget.style.background = 'var(--hover)' }}
              onMouseLeave={e => { e.currentTarget.style.background = 'transparent' }}
              data-testid="status-modified-count"
            ><CircleDot size={13} style={{ color: 'var(--accent-orange)' }} />{modifiedCount} pending</span>
          </>
        )}
      </div>
      <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
        <span style={ICON_STYLE}><Sparkles size={13} style={{ color: 'var(--accent-purple)' }} />Claude Sonnet 4</span>
        <span style={ICON_STYLE}><FileText size={13} />{noteCount.toLocaleString()} notes</span>
        {zoomLevel !== 100 && (
          <span
            role="button"
            onClick={onZoomReset}
            style={{ ...ICON_STYLE, cursor: 'pointer', padding: '2px 4px', borderRadius: 3, background: 'transparent' }}
            title="Reset zoom (⌘0)"
            onMouseEnter={e => { e.currentTarget.style.background = 'var(--hover)' }}
            onMouseLeave={e => { e.currentTarget.style.background = 'transparent' }}
            data-testid="status-zoom"
          >{zoomLevel}%</span>
        )}
        <span style={DISABLED_STYLE} title="Coming soon"><Bell size={14} /></span>
        <span
          role="button"
          onClick={onOpenSettings}
          style={{ display: 'flex', alignItems: 'center', cursor: 'pointer', padding: '2px 4px', borderRadius: 3, background: 'transparent' }}
          title="Settings (⌘,)"
          onMouseEnter={e => { e.currentTarget.style.background = 'var(--hover)' }}
          onMouseLeave={e => { e.currentTarget.style.background = 'transparent' }}
        >
          <Settings size={14} />
        </span>
      </div>
    </footer>
  )
}