src/app/editor/[projectId]/FlowchartEditor.tsx

@@ -201,7 +201,7 @@ function computeMigration(initialData: FlowchartData, shouldMigrate: boolean) {
 }
 
 // Inner component that uses useReactFlow hook
-function FlowchartEditorInner({ initialData, needsMigration }: FlowchartEditorProps) {
+function FlowchartEditorInner({ projectId, initialData, needsMigration }: FlowchartEditorProps) {
   // Define custom node types - memoized to prevent re-renders
   const nodeTypes: NodeTypes = useMemo(
     () => ({
@@ -431,6 +431,7 @@ function FlowchartEditorInner({ initialData, needsMigration }: FlowchartEditorPr
         </div>
         {showSettings && (
           <ProjectSettingsModal
+            projectId={projectId}
             characters={characters}
             variables={variables}
             onCharactersChange={setCharacters}

src/components/editor/ImportFromProjectModal.tsx

@@ -0,0 +1,386 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { nanoid } from 'nanoid'
+import { createClient } from '@/lib/supabase/client'
+import type { Character, Variable } from '@/types/flowchart'
+
+type ImportMode = 'characters' | 'variables'
+
+type ProjectListItem = {
+  id: string
+  name: string
+}
+
+type ImportFromProjectModalProps = {
+  mode: ImportMode
+  currentProjectId: string
+  existingCharacters: Character[]
+  existingVariables: Variable[]
+  onImportCharacters: (characters: Character[]) => void
+  onImportVariables: (variables: Variable[]) => void
+  onClose: () => void
+}
+
+export default function ImportFromProjectModal({
+  mode,
+  currentProjectId,
+  existingCharacters,
+  existingVariables,
+  onImportCharacters,
+  onImportVariables,
+  onClose,
+}: ImportFromProjectModalProps) {
+  const [projects, setProjects] = useState<ProjectListItem[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<string | null>(null)
+  const [selectedProjectId, setSelectedProjectId] = useState<string | null>(null)
+  const [sourceCharacters, setSourceCharacters] = useState<Character[]>([])
+  const [sourceVariables, setSourceVariables] = useState<Variable[]>([])
+  const [loadingSource, setLoadingSource] = useState(false)
+  const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set())
+  const [warnings, setWarnings] = useState<string[]>([])
+
+  // Load user's projects on mount
+  useEffect(() => {
+    async function fetchProjects() {
+      const supabase = createClient()
+      const { data, error: fetchError } = await supabase
+        .from('projects')
+        .select('id, name')
+        .neq('id', currentProjectId)
+        .order('name')
+
+      if (fetchError) {
+        setError('Failed to load projects')
+        setLoading(false)
+        return
+      }
+
+      setProjects(data || [])
+      setLoading(false)
+    }
+
+    fetchProjects()
+  }, [currentProjectId])
+
+  // Load source project's characters/variables when a project is selected
+  const handleSelectProject = async (projectId: string) => {
+    setSelectedProjectId(projectId)
+    setLoadingSource(true)
+    setWarnings([])
+    setSelectedIds(new Set())
+
+    const supabase = createClient()
+    const { data, error: fetchError } = await supabase
+      .from('projects')
+      .select('flowchart_data')
+      .eq('id', projectId)
+      .single()
+
+    if (fetchError || !data) {
+      setError('Failed to load project data')
+      setLoadingSource(false)
+      return
+    }
+
+    const flowchartData = data.flowchart_data || {}
+    const chars: Character[] = flowchartData.characters || []
+    const vars: Variable[] = flowchartData.variables || []
+
+    setSourceCharacters(chars)
+    setSourceVariables(vars)
+    setLoadingSource(false)
+
+    // Select all by default
+    const items = mode === 'characters' ? chars : vars
+    setSelectedIds(new Set(items.map((item) => item.id)))
+  }
+
+  const handleToggleItem = (id: string) => {
+    setSelectedIds((prev) => {
+      const next = new Set(prev)
+      if (next.has(id)) {
+        next.delete(id)
+      } else {
+        next.add(id)
+      }
+      return next
+    })
+  }
+
+  const handleSelectAll = () => {
+    const items = mode === 'characters' ? sourceCharacters : sourceVariables
+    setSelectedIds(new Set(items.map((item) => item.id)))
+  }
+
+  const handleSelectNone = () => {
+    setSelectedIds(new Set())
+  }
+
+  const handleImport = () => {
+    const importWarnings: string[] = []
+
+    if (mode === 'characters') {
+      const selectedCharacters = sourceCharacters.filter((c) => selectedIds.has(c.id))
+      const existingNames = new Set(existingCharacters.map((c) => c.name.toLowerCase()))
+      const toImport: Character[] = []
+
+      for (const char of selectedCharacters) {
+        if (existingNames.has(char.name.toLowerCase())) {
+          importWarnings.push(`Skipped "${char.name}" (already exists)`)
+        } else {
+          // Create new ID to avoid conflicts
+          toImport.push({ ...char, id: nanoid() })
+          existingNames.add(char.name.toLowerCase())
+        }
+      }
+
+      if (importWarnings.length > 0) {
+        setWarnings(importWarnings)
+      }
+
+      if (toImport.length > 0) {
+        onImportCharacters(toImport)
+      }
+
+      if (importWarnings.length === 0) {
+        onClose()
+      }
+    } else {
+      const selectedVariables = sourceVariables.filter((v) => selectedIds.has(v.id))
+      const existingNames = new Set(existingVariables.map((v) => v.name.toLowerCase()))
+      const toImport: Variable[] = []
+
+      for (const variable of selectedVariables) {
+        if (existingNames.has(variable.name.toLowerCase())) {
+          importWarnings.push(`Skipped "${variable.name}" (already exists)`)
+        } else {
+          // Create new ID to avoid conflicts
+          toImport.push({ ...variable, id: nanoid() })
+          existingNames.add(variable.name.toLowerCase())
+        }
+      }
+
+      if (importWarnings.length > 0) {
+        setWarnings(importWarnings)
+      }
+
+      if (toImport.length > 0) {
+        onImportVariables(toImport)
+      }
+
+      if (importWarnings.length === 0) {
+        onClose()
+      }
+    }
+  }
+
+  const items = mode === 'characters' ? sourceCharacters : sourceVariables
+
+  return (
+    <div className="fixed inset-0 z-[60] flex items-center justify-center">
+      <div
+        className="absolute inset-0 bg-black/50"
+        onClick={onClose}
+        aria-hidden="true"
+      />
+      <div className="relative flex max-h-[80vh] w-full max-w-lg flex-col rounded-lg bg-white shadow-xl dark:bg-zinc-800">
+        {/* Header */}
+        <div className="flex items-center justify-between border-b border-zinc-200 px-6 py-4 dark:border-zinc-700">
+          <h3 className="text-base font-semibold text-zinc-900 dark:text-zinc-50">
+            Import {mode === 'characters' ? 'Characters' : 'Variables'} from Project
+          </h3>
+          <button
+            onClick={onClose}
+            className="rounded p-1 text-zinc-500 hover:bg-zinc-100 hover:text-zinc-700 dark:text-zinc-400 dark:hover:bg-zinc-700 dark:hover:text-zinc-200"
+          >
+            <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+            </svg>
+          </button>
+        </div>
+
+        {/* Content */}
+        <div className="flex-1 overflow-y-auto px-6 py-4">
+          {loading && (
+            <p className="py-8 text-center text-sm text-zinc-500 dark:text-zinc-400">
+              Loading projects...
+            </p>
+          )}
+
+          {error && (
+            <p className="py-4 text-center text-sm text-red-600 dark:text-red-400">{error}</p>
+          )}
+
+          {!loading && !error && !selectedProjectId && (
+            <>
+              {projects.length === 0 ? (
+                <p className="py-8 text-center text-sm text-zinc-400 dark:text-zinc-500">
+                  No other projects found.
+                </p>
+              ) : (
+                <div className="space-y-1">
+                  <p className="mb-3 text-sm text-zinc-600 dark:text-zinc-400">
+                    Select a project to import from:
+                  </p>
+                  {projects.map((project) => (
+                    <button
+                      key={project.id}
+                      onClick={() => handleSelectProject(project.id)}
+                      className="flex w-full items-center rounded-lg border border-zinc-200 px-4 py-3 text-left text-sm font-medium text-zinc-900 hover:bg-zinc-50 dark:border-zinc-700 dark:text-zinc-50 dark:hover:bg-zinc-700/50"
+                    >
+                      <svg className="mr-3 h-4 w-4 text-zinc-400" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z" />
+                      </svg>
+                      {project.name}
+                    </button>
+                  ))}
+                </div>
+              )}
+            </>
+          )}
+
+          {loadingSource && (
+            <p className="py-8 text-center text-sm text-zinc-500 dark:text-zinc-400">
+              Loading {mode}...
+            </p>
+          )}
+
+          {selectedProjectId && !loadingSource && (
+            <>
+              {/* Back button */}
+              <button
+                onClick={() => { setSelectedProjectId(null); setWarnings([]) }}
+                className="mb-3 flex items-center gap-1 text-sm text-zinc-600 hover:text-zinc-900 dark:text-zinc-400 dark:hover:text-zinc-50"
+              >
+                <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
+                </svg>
+                Back to projects
+              </button>
+
+              {items.length === 0 ? (
+                <p className="py-8 text-center text-sm text-zinc-400 dark:text-zinc-500">
+                  This project has no {mode} defined.
+                </p>
+              ) : (
+                <>
+                  {/* Select all/none controls */}
+                  <div className="mb-3 flex items-center gap-3">
+                    <span className="text-sm text-zinc-600 dark:text-zinc-400">
+                      {selectedIds.size} of {items.length} selected
+                    </span>
+                    <button
+                      onClick={handleSelectAll}
+                      className="text-xs text-blue-600 hover:text-blue-700 dark:text-blue-400 dark:hover:text-blue-300"
+                    >
+                      Select all
+                    </button>
+                    <button
+                      onClick={handleSelectNone}
+                      className="text-xs text-blue-600 hover:text-blue-700 dark:text-blue-400 dark:hover:text-blue-300"
+                    >
+                      Select none
+                    </button>
+                  </div>
+
+                  {/* Item list with checkboxes */}
+                  <div className="space-y-1">
+                    {mode === 'characters'
+                      ? sourceCharacters.map((char) => (
+                          <label
+                            key={char.id}
+                            className="flex cursor-pointer items-center gap-3 rounded-lg border border-zinc-200 px-4 py-2.5 hover:bg-zinc-50 dark:border-zinc-700 dark:hover:bg-zinc-700/50"
+                          >
+                            <input
+                              type="checkbox"
+                              checked={selectedIds.has(char.id)}
+                              onChange={() => handleToggleItem(char.id)}
+                              className="h-4 w-4 rounded border-zinc-300 text-blue-600 focus:ring-blue-500 dark:border-zinc-600"
+                            />
+                            <div
+                              className="h-3.5 w-3.5 rounded-full"
+                              style={{ backgroundColor: char.color }}
+                            />
+                            <span className="text-sm text-zinc-900 dark:text-zinc-50">
+                              {char.name}
+                            </span>
+                            {char.description && (
+                              <span className="text-xs text-zinc-500 dark:text-zinc-400">
+                                - {char.description}
+                              </span>
+                            )}
+                          </label>
+                        ))
+                      : sourceVariables.map((variable) => (
+                          <label
+                            key={variable.id}
+                            className="flex cursor-pointer items-center gap-3 rounded-lg border border-zinc-200 px-4 py-2.5 hover:bg-zinc-50 dark:border-zinc-700 dark:hover:bg-zinc-700/50"
+                          >
+                            <input
+                              type="checkbox"
+                              checked={selectedIds.has(variable.id)}
+                              onChange={() => handleToggleItem(variable.id)}
+                              className="h-4 w-4 rounded border-zinc-300 text-blue-600 focus:ring-blue-500 dark:border-zinc-600"
+                            />
+                            <span className={`rounded px-1.5 py-0.5 text-xs font-medium ${
+                              variable.type === 'numeric'
+                                ? 'bg-blue-100 text-blue-700 dark:bg-blue-900/30 dark:text-blue-300'
+                                : variable.type === 'string'
+                                ? 'bg-green-100 text-green-700 dark:bg-green-900/30 dark:text-green-300'
+                                : 'bg-purple-100 text-purple-700 dark:bg-purple-900/30 dark:text-purple-300'
+                            }`}>
+                              {variable.type}
+                            </span>
+                            <span className="text-sm text-zinc-900 dark:text-zinc-50">
+                              {variable.name}
+                            </span>
+                            <span className="text-xs text-zinc-500 dark:text-zinc-400">
+                              (initial: {String(variable.initialValue)})
+                            </span>
+                          </label>
+                        ))}
+                  </div>
+
+                  {/* Warnings */}
+                  {warnings.length > 0 && (
+                    <div className="mt-3 rounded-lg border border-orange-200 bg-orange-50 p-3 dark:border-orange-800 dark:bg-orange-900/20">
+                      <p className="mb-1 text-xs font-medium text-orange-700 dark:text-orange-300">
+                        Import warnings:
+                      </p>
+                      {warnings.map((warning, i) => (
+                        <p key={i} className="text-xs text-orange-600 dark:text-orange-400">
+                          {warning}
+                        </p>
+                      ))}
+                    </div>
+                  )}
+                </>
+              )}
+            </>
+          )}
+        </div>
+
+        {/* Footer with import button */}
+        {selectedProjectId && !loadingSource && items.length > 0 && (
+          <div className="flex items-center justify-end gap-3 border-t border-zinc-200 px-6 py-3 dark:border-zinc-700">
+            <button
+              onClick={onClose}
+              className="rounded-md border border-zinc-300 bg-white px-4 py-2 text-sm font-medium text-zinc-700 hover:bg-zinc-50 dark:border-zinc-600 dark:bg-zinc-700 dark:text-zinc-300 dark:hover:bg-zinc-600"
+            >
+              Cancel
+            </button>
+            <button
+              onClick={handleImport}
+              disabled={selectedIds.size === 0}
+              className="rounded-md bg-blue-500 px-4 py-2 text-sm font-medium text-white hover:bg-blue-600 disabled:cursor-not-allowed disabled:opacity-50 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 dark:focus:ring-offset-zinc-800"
+            >
+              Import {selectedIds.size > 0 ? `(${selectedIds.size})` : ''}
+            </button>
+          </div>
+        )}
+      </div>
+    </div>
+  )
+}

src/components/editor/ProjectSettingsModal.tsx

@@ -3,10 +3,14 @@
 import { useState } from 'react'
 import { nanoid } from 'nanoid'
 import type { Character, Variable } from '@/types/flowchart'
+import ImportFromProjectModal from './ImportFromProjectModal'
 
 type Tab = 'characters' | 'variables'
 
+type ImportModalState = { open: boolean; mode: 'characters' | 'variables' }
+
 type ProjectSettingsModalProps = {
+  projectId: string
   characters: Character[]
   variables: Variable[]
   onCharactersChange: (characters: Character[]) => void
@@ -26,6 +30,7 @@ function randomHexColor(): string {
 }
 
 export default function ProjectSettingsModal({
+  projectId,
   characters,
   variables,
   onCharactersChange,
@@ -35,6 +40,15 @@ export default function ProjectSettingsModal({
   getVariableUsageCount,
 }: ProjectSettingsModalProps) {
   const [activeTab, setActiveTab] = useState<Tab>('characters')
+  const [importModal, setImportModal] = useState<ImportModalState>({ open: false, mode: 'characters' })
+
+  const handleImportCharacters = (imported: Character[]) => {
+    onCharactersChange([...characters, ...imported])
+  }
+
+  const handleImportVariables = (imported: Variable[]) => {
+    onVariablesChange([...variables, ...imported])
+  }
 
   return (
     <div className="fixed inset-0 z-50 flex items-center justify-center">
@@ -90,6 +104,7 @@ export default function ProjectSettingsModal({
               characters={characters}
               onChange={onCharactersChange}
               getUsageCount={getCharacterUsageCount}
+              onImport={() => setImportModal({ open: true, mode: 'characters' })}
             />
           )}
           {activeTab === 'variables' && (
@@ -97,10 +112,23 @@ export default function ProjectSettingsModal({
               variables={variables}
               onChange={onVariablesChange}
               getUsageCount={getVariableUsageCount}
+              onImport={() => setImportModal({ open: true, mode: 'variables' })}
             />
           )}
         </div>
       </div>
+
+      {importModal.open && (
+        <ImportFromProjectModal
+          mode={importModal.mode}
+          currentProjectId={projectId}
+          existingCharacters={characters}
+          existingVariables={variables}
+          onImportCharacters={handleImportCharacters}
+          onImportVariables={handleImportVariables}
+          onClose={() => setImportModal({ open: false, mode: importModal.mode })}
+        />
+      )}
     </div>
   )
 }
@@ -110,6 +138,7 @@ type CharactersTabProps = {
   characters: Character[]
   onChange: (characters: Character[]) => void
   getUsageCount: (characterId: string) => number
+  onImport: () => void
 }
 
 type CharacterFormData = {
@@ -118,7 +147,7 @@ type CharacterFormData = {
   description: string
 }
 
-function CharactersTab({ characters, onChange, getUsageCount }: CharactersTabProps) {
+function CharactersTab({ characters, onChange, getUsageCount, onImport }: CharactersTabProps) {
   const [isAdding, setIsAdding] = useState(false)
   const [editingId, setEditingId] = useState<string | null>(null)
   const [formData, setFormData] = useState<CharacterFormData>({ name: '', color: randomHexColor(), description: '' })
@@ -207,12 +236,20 @@ function CharactersTab({ characters, onChange, getUsageCount }: CharactersTabPro
           Define characters that can be referenced in dialogue nodes.
         </p>
         {!isAdding && !editingId && (
-          <button
-            onClick={() => { setIsAdding(true); resetForm(); setDeleteConfirm(null) }}
-            className="rounded bg-blue-500 px-3 py-1.5 text-sm font-medium text-white hover:bg-blue-600 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 dark:focus:ring-offset-zinc-800"
-          >
-            Add Character
-          </button>
+          <div className="flex items-center gap-2">
+            <button
+              onClick={onImport}
+              className="rounded border border-zinc-300 bg-white px-3 py-1.5 text-sm font-medium text-zinc-700 hover:bg-zinc-50 dark:border-zinc-600 dark:bg-zinc-700 dark:text-zinc-300 dark:hover:bg-zinc-600"
+            >
+              Import from project
+            </button>
+            <button
+              onClick={() => { setIsAdding(true); resetForm(); setDeleteConfirm(null) }}
+              className="rounded bg-blue-500 px-3 py-1.5 text-sm font-medium text-white hover:bg-blue-600 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 dark:focus:ring-offset-zinc-800"
+            >
+              Add Character
+            </button>
+          </div>
         )}
       </div>
 
@@ -378,6 +415,7 @@ type VariablesTabProps = {
   variables: Variable[]
   onChange: (variables: Variable[]) => void
   getUsageCount: (variableId: string) => number
+  onImport: () => void
 }
 
 type VariableType = 'numeric' | 'string' | 'boolean'
@@ -406,7 +444,7 @@ function parseInitialValue(type: VariableType, raw: string): number | string | b
   }
 }
 
-function VariablesTab({ variables, onChange, getUsageCount }: VariablesTabProps) {
+function VariablesTab({ variables, onChange, getUsageCount, onImport }: VariablesTabProps) {
   const [isAdding, setIsAdding] = useState(false)
   const [editingId, setEditingId] = useState<string | null>(null)
   const [formData, setFormData] = useState<VariableFormData>({ name: '', type: 'numeric', initialValue: '0', description: '' })
@@ -503,12 +541,20 @@ function VariablesTab({ variables, onChange, getUsageCount }: VariablesTabProps)
           Define variables that can be referenced in variable nodes and edge conditions.
         </p>
         {!isAdding && !editingId && (
-          <button
-            onClick={() => { setIsAdding(true); resetForm(); setDeleteConfirm(null) }}
-            className="rounded bg-blue-500 px-3 py-1.5 text-sm font-medium text-white hover:bg-blue-600 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 dark:focus:ring-offset-zinc-800"
-          >
-            Add Variable
-          </button>
+          <div className="flex items-center gap-2">
+            <button
+              onClick={onImport}
+              className="rounded border border-zinc-300 bg-white px-3 py-1.5 text-sm font-medium text-zinc-700 hover:bg-zinc-50 dark:border-zinc-600 dark:bg-zinc-700 dark:text-zinc-300 dark:hover:bg-zinc-600"
+            >
+              Import from project
+            </button>
+            <button
+              onClick={() => { setIsAdding(true); resetForm(); setDeleteConfirm(null) }}
+              className="rounded bg-blue-500 px-3 py-1.5 text-sm font-medium text-white hover:bg-blue-600 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2 dark:focus:ring-offset-zinc-800"
+            >
+              Add Variable
+            </button>
+          </div>
         )}
       </div>