# All files / src/components Editor.tsx

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     import { useEffect, useState, useCallback, useMemo, useRef, memo } from 'react'
    import { BlockNoteSchema, defaultInlineContentSpecs } from '@blocknote/core'
    import { filterSuggestionItems } from '@blocknote/core/extensions'
    import { createReactInlineContentSpec, useCreateBlockNote, SuggestionMenuController } from '@blocknote/react'
    import { BlockNoteView } from '@blocknote/mantine'
    import '@blocknote/mantine/style.css'
    import { uploadImageFile, useImageDrop } from '../hooks/useImageDrop'
    import type { VaultEntry, GitCommit, NoteStatus } from '../types'
    import { Inspector, type FrontmatterValue } from './Inspector'
    import { AIChatPanel } from './AIChatPanel'
    import { DiffView } from './DiffView'
    import { ResizeHandle } from './ResizeHandle'
    import { TabBar } from './TabBar'
    import { BreadcrumbBar } from './BreadcrumbBar'
    import { useEditorTheme } from '../hooks/useTheme'
    import { splitFrontmatter, preProcessWikilinks, injectWikilinks, restoreWikilinksInBlocks, countWords } from '../utils/wikilinks'
    import { preFilterWikilinks, deduplicateByPath, disambiguateTitles, MAX_RESULTS, MIN_QUERY_LENGTH } from '../utils/wikilinkSuggestions'
    import { filterPersonMentions, PERSON_MENTION_MIN_QUERY } from '../utils/personMentionSuggestions'
    import { resolveWikilinkColor as resolveColor } from '../utils/wikilinkColors'
    import { getTypeColor } from '../utils/typeColors'
    import { WikilinkSuggestionMenu, type WikilinkSuggestionItem } from './WikilinkSuggestionMenu'
    import './Editor.css'
    import './EditorTheme.css'

    interface Tab {
      entry: VaultEntry
      content: string
    }

    interface EditorProps {
      tabs: Tab[]
      activeTabPath: string | null
      entries: VaultEntry[]
      onSwitchTab: (path: string) => void
      onCloseTab: (path: string) => void
      onReorderTabs?: (fromIndex: number, toIndex: number) => void
      onNavigateWikilink: (target: string) => void
      onLoadDiff?: (path: string) => Promise<string>
      onLoadDiffAtCommit?: (path: string, commitHash: string) => Promise<string>
      getNoteStatus?: (path: string) => NoteStatus
      onCreateNote?: () => void
      // Inspector props
      inspectorCollapsed: boolean
      onToggleInspector: () => void
      inspectorWidth: number
      onInspectorResize: (delta: number) => void
      inspectorEntry: VaultEntry | null
      inspectorContent: string | null
      allContent: Record<string, string>
      gitHistory: GitCommit[]
      onUpdateFrontmatter?: (path: string, key: string, value: FrontmatterValue) => Promise<void>
      onDeleteProperty?: (path: string, key: string) => Promise<void>
      onAddProperty?: (path: string, key: string, value: FrontmatterValue) => Promise<void>
      showAIChat?: boolean
      onToggleAIChat?: () => void
      vaultPath?: string
      onTrashNote?: (path: string) => void
      onRestoreNote?: (path: string) => void
      onArchiveNote?: (path: string) => void
      onUnarchiveNote?: (path: string) => void
      onRenameTab?: (path: string, newTitle: string) => void
      onContentChange?: (path: string, content: string) => void
      canGoBack?: boolean
      canGoForward?: boolean
      onGoBack?: () => void
      onGoForward?: () => void
    }

    // --- Custom Inline Content: WikiLink ---

    // Module-level cache so the WikiLink renderer (defined outside React) can access entries
    const _wikilinkEntriesRef: { current: VaultEntry[] } = { current: [] }

    function resolveWikilinkColor(target: string) {
      return resolveColor(_wikilinkEntriesRef.current, target)
    }

    const WikiLink = createReactInlineContentSpec(
      {
        type: "wikilink" as const,
        propSchema: {
          target: { default: "" },
        },
        content: "none",
      },
      {
        render: (props) => {
          const target = props.inlineContent.props.target
          const { color, isBroken } = resolveWikilinkColor(target)
          return (
            <span
              className={`wikilink${isBroken ? ' wikilink--broken' : ''}`}
              data-target={target}
              style={{ color }}
            >
              {target}
            </span>
          )
        },
      }
    )

    // --- Schema with wikilink ---

    const schema = BlockNoteSchema.create({
      inlineContentSpecs: {
        ...defaultInlineContentSpecs,
        wikilink: WikiLink,
      },
    })

    /** Single BlockNote editor view — content is swapped via replaceBlocks */
    function SingleEditorView({ editor, entries, onNavigateWikilink, onChange }: { editor: ReturnType<typeof useCreateBlockNote>; entries: VaultEntry[]; onNavigateWikilink: (target: string) => void; onChange?: () => void }) {
      const navigateRef = useRef(onNavigateWikilink)
      useEffect(() => { navigateRef.current = onNavigateWikilink }, [onNavigateWikilink])
      const { cssVars } = useEditorTheme()
      const containerRef = useRef<HTMLDivElement>(null)
      const { isDragOver } = useImageDrop({ containerRef })

      // Keep module-level ref in sync so WikiLink renderer can access vault entries
      useEffect(() => {
        _wikilinkEntriesRef.current = entries
      }, [entries])

      useEffect(() => {
        const container = document.querySelector('.editor__blocknote-container')
        Iif (!container) return
        const handler = (e: MouseEvent) => {
          const wikilink = (e.target as HTMLElement).closest('.wikilink')
          if (wikilink) {
            e.preventDefault()
            e.stopPropagation()
            const target = (wikilink as HTMLElement).dataset.target
            if (target) navigateRef.current(target)
          }
        }
        container.addEventListener('click', handler as EventListener, true)
        return () => container.removeEventListener('click', handler as EventListener, true)
      }, [editor])

      const baseItems = useMemo(
        () => deduplicateByPath(entries.map(entry => ({
          title: entry.title,
          aliases: [...new Set([entry.filename.replace(/\.md$/, ''), ...entry.aliases])],
          group: entry.isA || 'Note',
          entryTitle: entry.title,
          path: entry.path,
        }))),
        [entries]
      )

      const getWikilinkItems = useCallback(async (query: string): Promise<WikilinkSuggestionItem[]> => {
        if (query.length < MIN_QUERY_LENGTH) return []

        const candidates = preFilterWikilinks(baseItems, query)
        const items = candidates.map(item => ({
          ...item,
          onItemClick: () => {
            editor.insertInlineContent([
              {
                type: 'wikilink' as const,
                props: { target: item.entryTitle },
              },
              " ",
            ])
          },
        }))
        const filtered = filterSuggestionItems(items, query).slice(0, MAX_RESULTS)
        const final = disambiguateTitles(deduplicateByPath(filtered))
        return final.map(({ group, ...rest }) => ({
          ...rest,
          noteType: group,
          typeColor: getTypeColor(group),
        }))
      }, [baseItems, editor])

      const getPersonMentionItems = useCallback(async (query: string): Promise<WikilinkSuggestionItem[]> => {
        Iif (query.length < PERSON_MENTION_MIN_QUERY) return []

        const candidates = filterPersonMentions(baseItems, query)
        const items = candidates.map(item => ({
          ...item,
          onItemClick: () => {
            editor.insertInlineContent([
              {
                type: 'wikilink' as const,
                props: { target: item.entryTitle },
              },
              " ",
            ])
          },
        }))
        const filtered = filterSuggestionItems(items, query).slice(0, MAX_RESULTS)
        const final = disambiguateTitles(deduplicateByPath(filtered))
        return final.map(({ group, ...rest }) => ({
          ...rest,
          noteType: group,
          typeColor: getTypeColor(group),
        }))
      }, [baseItems, editor])

      return (
        <div ref={containerRef} className={`editor__blocknote-container${isDragOver ? ' editor__blocknote-container--drag-over' : ''}`} style={cssVars as React.CSSProperties}>
          {isDragOver && (
            <div className="editor__drop-overlay">
              <div className="editor__drop-overlay-label">Drop image here</div>
            </div>
          )}
          <BlockNoteView
            editor={editor}
            theme="light"
            onChange={onChange}
          >
            <SuggestionMenuController
              triggerCharacter="[["
              getItems={getWikilinkItems}
              suggestionMenuComponent={WikilinkSuggestionMenu}
              onItemClick={(item: WikilinkSuggestionItem) => item.onItemClick()}
            />
            <SuggestionMenuController
              triggerCharacter="@"
              getItems={getPersonMentionItems}
              suggestionMenuComponent={WikilinkSuggestionMenu}
              onItemClick={(item: WikilinkSuggestionItem) => item.onItemClick()}
            />
          </BlockNoteView>
        </div>
      )
    }

    export const Editor = memo(function Editor({
      tabs, activeTabPath, entries, onSwitchTab, onCloseTab, onReorderTabs, onNavigateWikilink, onLoadDiff, onLoadDiffAtCommit, getNoteStatus, onCreateNote,
      inspectorCollapsed, onToggleInspector, inspectorWidth, onInspectorResize,
      inspectorEntry, inspectorContent, allContent, gitHistory,
      onUpdateFrontmatter, onDeleteProperty, onAddProperty,
      showAIChat, onToggleAIChat,
      vaultPath,
      onTrashNote, onRestoreNote,
      onArchiveNote, onUnarchiveNote,
      onRenameTab,
      onContentChange,
      canGoBack, canGoForward, onGoBack, onGoForward,
    }: EditorProps) {
      const [diffMode, setDiffMode] = useState(false)
      const [diffContent, setDiffContent] = useState<string | null>(null)
      const [diffLoading, setDiffLoading] = useState(false)

      // Ref for vaultPath so the uploadFile closure always sees the latest value
      const vaultPathRef = useRef(vaultPath)
      vaultPathRef.current = vaultPath

      // Single editor instance — reused across all tabs
      const editor = useCreateBlockNote({
        schema,
        uploadFile: (file: File) => uploadImageFile(file, vaultPathRef.current),
      })
      // Cache parsed blocks per tab path for instant switching
      // eslint-disable-next-line @typescript-eslint/no-explicit-any -- BlockNote block arrays
      const tabCacheRef = useRef<Map<string, any[]>>(new Map())
      const prevActivePathRef = useRef<string | null>(null)
      const editorMountedRef = useRef(false)
      const pendingSwapRef = useRef<(() => void) | null>(null)

      // Track editor mount state
      useEffect(() => {
        // Check if already mounted (prosemirrorView exists)
        if (editor.prosemirrorView) {
          editorMountedRef.current = true
        }
        const cleanup = editor.onMount(() => {
          editorMountedRef.current = true
          // Execute any pending content swap that was queued before mount.
          // Defer via queueMicrotask so BlockNote's internal flushSync calls
          // don't collide with React's commit phase.
          Iif (pendingSwapRef.current) {
            const swap = pendingSwapRef.current
            pendingSwapRef.current = null
            queueMicrotask(swap)
          }
        })
        return cleanup
      }, [editor])

      // Suppress onChange during programmatic content swaps (tab switching / initial load)
      const suppressChangeRef = useRef(false)

      // Keep refs to callbacks for the onChange handler
      const onContentChangeRef = useRef(onContentChange)
      onContentChangeRef.current = onContentChange
      const tabsRef = useRef(tabs)
      tabsRef.current = tabs

      // onChange handler: serialize editor blocks → markdown, reconstruct full file, call save
      const handleEditorChange = useCallback(() => {
        if (suppressChangeRef.current) return
        const path = prevActivePathRef.current
        if (!path) return

        const tab = tabsRef.current.find(t => t.entry.path === path)
        if (!tab) return

        // Convert blocks → markdown, restoring wikilinks first
        const blocks = editor.document
        const restored = restoreWikilinksInBlocks(blocks)
        const bodyMarkdown = editor.blocksToMarkdownLossy(restored as typeof blocks)

        // Reconstruct the full file: preserve original frontmatter + title heading
        const [frontmatter] = splitFrontmatter(tab.content)
        const title = tab.entry.title
        const fullContent = `${frontmatter}# ${title}\n\n${bodyMarkdown}`

        onContentChangeRef.current?.(path, fullContent)
      }, [editor])

      // Swap document content when active tab changes.
      // Uses queueMicrotask to defer BlockNote mutations outside React's commit phase,
      // avoiding flushSync-inside-lifecycle errors that silently prevent content from rendering.
      useEffect(() => {
        const cache = tabCacheRef.current
        const prevPath = prevActivePathRef.current
        const pathChanged = prevPath !== activeTabPath

        // Save current editor state for the tab we're leaving
        Iif (prevPath && pathChanged && editorMountedRef.current) {
          cache.set(prevPath, editor.document)
        }
        prevActivePathRef.current = activeTabPath

        // When tab content updates but the active tab stays the same (e.g. after
        // Cmd+S save), refresh the cache with the current editor blocks so a later
        // tab switch doesn't revert to stale content. Do NOT re-apply blocks —
        // the editor already shows the user's edits.
        if (!pathChanged) {
          Iif (activeTabPath && editorMountedRef.current) {
            cache.set(activeTabPath, editor.document)
          }
          return
        }

        Iif (!activeTabPath) return

        const tab = tabs.find(t => t.entry.path === activeTabPath)
        Iif (!tab) return

        // eslint-disable-next-line @typescript-eslint/no-explicit-any -- BlockNote's PartialBlock generic is extremely complex
        const applyBlocks = (blocks: any[]) => {
          suppressChangeRef.current = true
          try {
            const current = editor.document
            if (current.length > 0 && blocks.length > 0) {
              editor.replaceBlocks(current, blocks)
            I} else if (blocks.length > 0) {
              editor.insertBlocks(blocks, current[0], 'before')
            }
          } catch (err) {
            console.error('applyBlocks failed, trying fallback:', err)
            try {
              const html = editor.blocksToHTMLLossy(blocks)
              editor._tiptapEditor.commands.setContent(html)
            } catch (err2) {
              console.error('Fallback also failed:', err2)
            }
          } finally {
            // Re-enable change detection on next microtask, after BlockNote
            // finishes its internal state updates from the content swap
            queueMicrotask(() => { suppressChangeRef.current = false })
          }
        }

        const targetPath = activeTabPath

        const doSwap = () => {
          // Guard: bail if user switched tabs since this swap was scheduled
          Iif (prevActivePathRef.current !== targetPath) return

          Iif (cache.has(targetPath)) {
            applyBlocks(cache.get(targetPath)!)
            return
          }

          const [, rawBody] = splitFrontmatter(tab.content)
          const body = rawBody.replace(/^# [^\n]*\n?/, '').trimStart()
          const preprocessed = preProcessWikilinks(body)

          try {
            const result = editor.tryParseMarkdownToBlocks(preprocessed)
            // eslint-disable-next-line @typescript-eslint/no-explicit-any -- BlockNote block arrays
            const handleBlocks = (blocks: any[]) => {
              Iif (prevActivePathRef.current !== targetPath) return
              const withWikilinks = injectWikilinks(blocks)
              // Only cache non-empty results to avoid poisoning the cache
              if (withWikilinks.length > 0) {
                cache.set(targetPath, withWikilinks)
              }
              applyBlocks(withWikilinks)
            }
            /* eslint-disable @typescript-eslint/no-explicit-any -- tryParseMarkdownToBlocks returns sync or async BlockNote blocks */
            if (result && typeof (result as any).then === 'function') {
              (result as unknown as Promise<any[]>).then(handleBlocks).catch((err: unknown) => {
                console.error('Async markdown parse failed:', err)
              })
            } else E{
              handleBlocks(result as any[])
            }
            /* eslint-enable @typescript-eslint/no-explicit-any */
          } catch (err) {
            console.error('Failed to parse/swap editor content:', err)
          }
        }

        if (editor.prosemirrorView) {
          // Defer the swap outside React's commit phase so BlockNote's internal
          // flushSync calls don't collide with React's rendering lifecycle.
          queueMicrotask(doSwap)
        } else E{
          pendingSwapRef.current = doSwap
        }
      }, [activeTabPath, tabs, editor])

      // Clean up cache entries when tabs are closed
      const tabPathsRef = useRef<Set<string>>(new Set())
      useEffect(() => {
        const currentPaths = new Set(tabs.map(t => t.entry.path))
        for (const path of tabPathsRef.current) {
          if (!currentPaths.has(path)) {
            tabCacheRef.current.delete(path)
          }
        }
        tabPathsRef.current = currentPaths
      }, [tabs])

      // Focus editor when a new note is created (signaled via custom event)
      useEffect(() => {
        const handler = () => {
          setTimeout(() => editor.focus(), 150)
        }
        window.addEventListener('laputa:focus-editor', handler)
        return () => window.removeEventListener('laputa:focus-editor', handler)
      }, [editor])

      const activeTab = tabs.find((t) => t.entry.path === activeTabPath) ?? null
      const isLoadingNewTab = activeTabPath !== null && !activeTab
      const activeStatus = activeTab ? getNoteStatus?.(activeTab.entry.path) ?? 'clean' : 'clean'
      const showDiffToggle = activeTab && (diffMode || activeStatus === 'modified')

      useEffect(() => {
        setDiffMode(false)
        setDiffContent(null)
      }, [activeTabPath])

      const handleToggleDiff = useCallback(async () => {
        if (diffMode) {
          setDiffMode(false)
          setDiffContent(null)
          return
        }
        if (!activeTabPath || !onLoadDiff) return
        setDiffLoading(true)
        try {
          const diff = await onLoadDiff(activeTabPath)
          setDiffContent(diff)
          setDiffMode(true)
        } catch (err) {
          console.warn('Failed to load diff:', err)
        } finally {
          setDiffLoading(false)
        }
      }, [diffMode, activeTabPath, onLoadDiff])

      const handleViewCommitDiff = useCallback(async (commitHash: string) => {
        if (!activeTabPath || !onLoadDiffAtCommit) return
        setDiffLoading(true)
        try {
          const diff = await onLoadDiffAtCommit(activeTabPath, commitHash)
          setDiffContent(diff)
          setDiffMode(true)
        } catch (err) {
          console.warn('Failed to load commit diff:', err)
        } finally {
          setDiffLoading(false)
        }
      }, [activeTabPath, onLoadDiffAtCommit])

      const wordCount = activeTab ? countWords(activeTab.content) : 0

      const tabBar = (
        <TabBar
          tabs={tabs}
          activeTabPath={activeTabPath}
          getNoteStatus={getNoteStatus}
          onSwitchTab={onSwitchTab}
          onCloseTab={onCloseTab}
          onCreateNote={onCreateNote}
          onReorderTabs={onReorderTabs}
          onRenameTab={onRenameTab}
          canGoBack={canGoBack}
          canGoForward={canGoForward}
          onGoBack={onGoBack}
          onGoForward={onGoForward}
        />
      )

      const breadcrumbBar = activeTab ? (
        <BreadcrumbBar
          entry={activeTab.entry}
          wordCount={wordCount}
          noteStatus={activeStatus}
          showDiffToggle={!!showDiffToggle}
          diffMode={diffMode}
          diffLoading={diffLoading}
          onToggleDiff={handleToggleDiff}
          showAIChat={showAIChat}
          onToggleAIChat={onToggleAIChat}
          inspectorCollapsed={inspectorCollapsed}
          onToggleInspector={onToggleInspector}
          onTrash={onTrashNote ? () => onTrashNote(activeTab.entry.path) : undefined}
          onRestore={onRestoreNote ? () => onRestoreNote(activeTab.entry.path) : undefined}
          onArchive={onArchiveNote ? () => onArchiveNote(activeTab.entry.path) : undefined}
          onUnarchive={onUnarchiveNote ? () => onUnarchiveNote(activeTab.entry.path) : undefined}
        />
      ) : null

      const rightPanel = showAIChat ? (
        <div
          className="shrink-0 flex flex-col min-h-0"
          style={{ width: inspectorWidth, height: '100%' }}
        >
          <AIChatPanel
            entry={inspectorEntry}
            allContent={allContent}
            entries={entries}
            onClose={() => onToggleAIChat?.()}
          />
        </div>
      ) : inspectorCollapsed ? null : (
        <div
          className="shrink-0 flex flex-col min-h-0"
          style={{ width: inspectorWidth, height: '100%' }}
        >
          <Inspector
            collapsed={inspectorCollapsed}
            onToggle={onToggleInspector}
            entry={inspectorEntry}
            content={inspectorContent}
            entries={entries}
            gitHistory={gitHistory}
            onNavigate={onNavigateWikilink}
            onViewCommitDiff={handleViewCommitDiff}
            onUpdateFrontmatter={onUpdateFrontmatter}
            onDeleteProperty={onDeleteProperty}
            onAddProperty={onAddProperty}
          />
        </div>
      )

      if (tabs.length === 0) {
        return (
          <div className="editor flex flex-col min-h-0 overflow-hidden bg-background text-foreground">
            {tabBar}
            <div className="flex flex-1 min-h-0">
              <div className="flex flex-1 flex-col items-center justify-center gap-2 text-center text-muted-foreground">
                <p className="m-0 text-[15px]">Select a note to start editing</p>
                <span className="text-xs text-muted-foreground">Cmd+P to search &middot; Cmd+N to create</span>
              </div>
              {(showAIChat || !inspectorCollapsed) && <ResizeHandle onResize={onInspectorResize} />}
              {rightPanel}
            </div>
          </div>
        )
      }

      return (
        <div className="editor flex flex-col min-h-0 overflow-hidden bg-background text-foreground">
          {tabBar}
          <div className="flex flex-1 min-h-0">
            <div className="flex flex-1 flex-col min-w-0 min-h-0">
              {breadcrumbBar}
              {diffMode && (
                <div className="flex-1 overflow-auto">
                  <button
                    className="flex items-center gap-1.5 px-4 py-2 text-xs text-primary bg-muted border-b border-border cursor-pointer hover:bg-accent transition-colors w-full border-t-0 border-l-0 border-r-0"
                    onClick={handleToggleDiff}
                    title="Back to editor"
                  >
                    <span style={{ fontSize: 14, lineHeight: 1 }}>&larr;</span>
                    Back to editor
                  </button>
                  <DiffView diff={diffContent ?? ''} />
                </div>
              )}
              {!diffMode && activeTab && (
                <div
                  style={{
                    display: 'flex',
                    flex: 1,
                    flexDirection: 'column',
                    minHeight: 0,
                  }}
                >
                  <SingleEditorView
                    editor={editor}
                    entries={entries}
                    onNavigateWikilink={onNavigateWikilink}
                    onChange={handleEditorChange}
                  />
                </div>
              )}
              {isLoadingNewTab && !diffMode && (
                <div className="flex flex-1 flex-col gap-3 p-8 animate-pulse" style={{ minHeight: 0 }}>
                  <div className="h-6 w-2/5 rounded bg-muted" />
                  <div className="h-4 w-4/5 rounded bg-muted" />
                  <div className="h-4 w-3/5 rounded bg-muted" />
                  <div className="h-4 w-4/5 rounded bg-muted" />
                  <div className="h-4 w-2/5 rounded bg-muted" />
                </div>
              )}
            </div>
            {(showAIChat || !inspectorCollapsed) && <ResizeHandle onResize={onInspectorResize} />}
            {rightPanel}
          </div>
        </div>
      )
    })