apps/api/src/personalities/dto/update-personality.dto.ts

@@ -1,4 +1,38 @@
-import { PartialType } from "@nestjs/mapped-types";
+import { IsString, IsOptional, IsBoolean, MinLength, MaxLength, IsIn } from "class-validator";
-import { CreatePersonalityDto } from "./create-personality.dto";
+import { FORMALITY_LEVELS, FormalityLevelType } from "./create-personality.dto";
 
-export class UpdatePersonalityDto extends PartialType(CreatePersonalityDto) {}
+export class UpdatePersonalityDto {
+  @IsOptional()
+  @IsString()
+  @MinLength(1)
+  @MaxLength(100)
+  name?: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(500)
+  description?: string;
+
+  @IsOptional()
+  @IsString()
+  @MinLength(1)
+  @MaxLength(50)
+  tone?: string;
+
+  @IsOptional()
+  @IsIn(FORMALITY_LEVELS)
+  formalityLevel?: FormalityLevelType;
+
+  @IsOptional()
+  @IsString()
+  @MinLength(10)
+  systemPromptTemplate?: string;
+
+  @IsOptional()
+  @IsBoolean()
+  isDefault?: boolean;
+
+  @IsOptional()
+  @IsBoolean()
+  isActive?: boolean;
+}

apps/api/src/personalities/personalities.controller.spec.ts

@@ -2,29 +2,24 @@ import { describe, it, expect, beforeEach, vi } from "vitest";
 import { Test, TestingModule } from "@nestjs/testing";
 import { PersonalitiesController } from "./personalities.controller";
 import { PersonalitiesService } from "./personalities.service";
+import { PromptFormatterService } from "./services/prompt-formatter.service";
 import { AuthGuard } from "../auth/guards/auth.guard";
-import { CreatePersonalityDto, UpdatePersonalityDto } from "./dto";
 
 describe("PersonalitiesController", () => {
   let controller: PersonalitiesController;
   let service: PersonalitiesService;
+  let promptFormatter: PromptFormatterService;
 
   const mockWorkspaceId = "workspace-123";
-  const mockUserId = "user-123";
   const mockPersonalityId = "personality-123";
-
+  const mockRequest = { user: { id: "user-123" }, workspaceId: mockWorkspaceId };
-  const mockRequest = {
-    user: { id: mockUserId },
-    workspaceId: mockWorkspaceId,
-  };
 
   const mockPersonality = {
     id: mockPersonalityId,
     workspaceId: mockWorkspaceId,
     name: "Professional",
-    description: "Professional communication style",
     tone: "professional",
-    formalityLevel: "FORMAL" as const,
+    formalityLevel: "FORMAL",
     systemPromptTemplate: "You are a professional assistant.",
     isDefault: true,
     isActive: true,
@@ -41,105 +36,82 @@ describe("PersonalitiesController", () => {
     remove: vi.fn(),
   };
 
-  const mockAuthGuard = {
+  const mockPromptFormatterService = {
-    canActivate: vi.fn().mockReturnValue(true),
+    formatPrompt: vi.fn(),
+    getFormalityLevels: vi.fn(),
   };
 
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
       controllers: [PersonalitiesController],
       providers: [
-        {
+        { provide: PersonalitiesService, useValue: mockPersonalitiesService },
-          provide: PersonalitiesService,
+        { provide: PromptFormatterService, useValue: mockPromptFormatterService },
-          useValue: mockPersonalitiesService,
-        },
       ],
     })
       .overrideGuard(AuthGuard)
-      .useValue(mockAuthGuard)
+      .useValue({ canActivate: () => true })
       .compile();
 
     controller = module.get<PersonalitiesController>(PersonalitiesController);
     service = module.get<PersonalitiesService>(PersonalitiesService);
-
+    promptFormatter = module.get<PromptFormatterService>(PromptFormatterService);
-    // Reset mocks
     vi.clearAllMocks();
   });
 
   describe("findAll", () => {
     it("should return all personalities", async () => {
-      const mockPersonalities = [mockPersonality];
-      mockPersonalitiesService.findAll.mockResolvedValue(mockPersonalities);
-
-      const result = await controller.findAll(mockRequest as any);
-
-      expect(result).toEqual(mockPersonalities);
-      expect(service.findAll).toHaveBeenCalledWith(mockWorkspaceId, true);
-    });
-
-    it("should filter by active status", async () => {
       mockPersonalitiesService.findAll.mockResolvedValue([mockPersonality]);
-
+      const result = await controller.findAll(mockRequest);
-      await controller.findAll(mockRequest as any, false);
+      expect(result).toEqual([mockPersonality]);
-
+      expect(service.findAll).toHaveBeenCalledWith(mockWorkspaceId, undefined);
-      expect(service.findAll).toHaveBeenCalledWith(mockWorkspaceId, false);
     });
   });
 
   describe("findOne", () => {
     it("should return a personality by id", async () => {
       mockPersonalitiesService.findOne.mockResolvedValue(mockPersonality);
-
+      const result = await controller.findOne(mockRequest, mockPersonalityId);
-      const result = await controller.findOne(mockRequest as any, mockPersonalityId);
-
       expect(result).toEqual(mockPersonality);
-      expect(service.findOne).toHaveBeenCalledWith(mockWorkspaceId, mockPersonalityId);
     });
   });
 
   describe("findDefault", () => {
     it("should return the default personality", async () => {
       mockPersonalitiesService.findDefault.mockResolvedValue(mockPersonality);
-
+      const result = await controller.findDefault(mockRequest);
-      const result = await controller.findDefault(mockRequest as any);
-
       expect(result).toEqual(mockPersonality);
-      expect(service.findDefault).toHaveBeenCalledWith(mockWorkspaceId);
+    });
+  });
+
+  describe("getFormalityLevels", () => {
+    it("should return formality levels", () => {
+      const levels = [{ level: "FORMAL", description: "Professional" }];
+      mockPromptFormatterService.getFormalityLevels.mockReturnValue(levels);
+      const result = controller.getFormalityLevels();
+      expect(result).toEqual(levels);
     });
   });
 
   describe("create", () => {
-    const createDto: CreatePersonalityDto = {
-      name: "Casual",
-      description: "Casual communication style",
-      tone: "casual",
-      formalityLevel: "CASUAL",
-      systemPromptTemplate: "You are a casual assistant.",
-    };
-
     it("should create a new personality", async () => {
-      const newPersonality = { ...mockPersonality, ...createDto, id: "new-id" };
+      const createDto = {
-      mockPersonalitiesService.create.mockResolvedValue(newPersonality);
+        name: "Casual",
-
+        tone: "casual",
-      const result = await controller.create(mockRequest as any, createDto);
+        formalityLevel: "CASUAL" as const,
-
+        systemPromptTemplate: "You are a casual assistant.",
-      expect(result).toEqual(newPersonality);
+      };
+      mockPersonalitiesService.create.mockResolvedValue({ ...mockPersonality, ...createDto });
+      await controller.create(mockRequest, createDto);
       expect(service.create).toHaveBeenCalledWith(mockWorkspaceId, createDto);
     });
   });
 
   describe("update", () => {
-    const updateDto: UpdatePersonalityDto = {
-      description: "Updated description",
-    };
-
     it("should update a personality", async () => {
-      const updatedPersonality = { ...mockPersonality, ...updateDto };
+      const updateDto = { description: "Updated" };
-      mockPersonalitiesService.update.mockResolvedValue(updatedPersonality);
+      mockPersonalitiesService.update.mockResolvedValue({ ...mockPersonality, ...updateDto });
-
+      await controller.update(mockRequest, mockPersonalityId, updateDto);
-      const result = await controller.update(mockRequest as any, mockPersonalityId, updateDto);
-
-      expect(result).toEqual(updatedPersonality);
       expect(service.update).toHaveBeenCalledWith(mockWorkspaceId, mockPersonalityId, updateDto);
     });
   });
@@ -147,11 +119,21 @@ describe("PersonalitiesController", () => {
   describe("remove", () => {
     it("should delete a personality", async () => {
       mockPersonalitiesService.remove.mockResolvedValue(mockPersonality);
-
+      await controller.remove(mockRequest, mockPersonalityId);
-      const result = await controller.remove(mockRequest as any, mockPersonalityId);
-
-      expect(result).toEqual(mockPersonality);
       expect(service.remove).toHaveBeenCalledWith(mockWorkspaceId, mockPersonalityId);
     });
   });
+
+  describe("previewPrompt", () => {
+    it("should return formatted system prompt", async () => {
+      const context = { userName: "John" };
+      mockPersonalitiesService.findOne.mockResolvedValue(mockPersonality);
+      mockPromptFormatterService.formatPrompt.mockReturnValue({
+        systemPrompt: "Formatted prompt",
+        metadata: {},
+      });
+      const result = await controller.previewPrompt(mockRequest, mockPersonalityId, context);
+      expect(result.systemPrompt).toBe("Formatted prompt");
+    });
+  });
 });

apps/api/src/personalities/personalities.controller.ts

@@ -9,69 +9,81 @@ import {
   Query,
   UseGuards,
   Req,
+  ParseBoolPipe,
+  HttpCode,
+  HttpStatus,
 } from "@nestjs/common";
 import { AuthGuard } from "../auth/guards/auth.guard";
 import { PersonalitiesService } from "./personalities.service";
+import { PromptFormatterService, PromptContext } from "./services/prompt-formatter.service";
 import { CreatePersonalityDto, UpdatePersonalityDto } from "./dto";
 import { Personality } from "./entities/personality.entity";
 
+interface AuthenticatedRequest {
+  user: { id: string };
+  workspaceId: string;
+}
+
 @Controller("personalities")
 @UseGuards(AuthGuard)
 export class PersonalitiesController {
-  constructor(private readonly personalitiesService: PersonalitiesService) {}
+  constructor(
+    private readonly personalitiesService: PersonalitiesService,
+    private readonly promptFormatter: PromptFormatterService,
+  ) {}
 
-  /**
-   * Get all personalities for the current workspace
-   */
   @Get()
   async findAll(
-    @Req() req: any,
+    @Req() req: AuthenticatedRequest,
-    @Query("isActive") isActive: boolean = true,
+    @Query("isActive", new ParseBoolPipe({ optional: true })) isActive?: boolean,
   ): Promise<Personality[]> {
     return this.personalitiesService.findAll(req.workspaceId, isActive);
   }
 
-  /**
-   * Get the default personality for the current workspace
-   */
   @Get("default")
-  async findDefault(@Req() req: any): Promise<Personality> {
+  async findDefault(@Req() req: AuthenticatedRequest): Promise<Personality> {
     return this.personalitiesService.findDefault(req.workspaceId);
   }
 
-  /**
+  @Get("formality-levels")
-   * Get a specific personality by ID
+  getFormalityLevels(): Array<{ level: string; description: string }> {
-   */
+    return this.promptFormatter.getFormalityLevels();
+  }
+
   @Get(":id")
-  async findOne(@Req() req: any, @Param("id") id: string): Promise<Personality> {
+  async findOne(@Req() req: AuthenticatedRequest, @Param("id") id: string): Promise<Personality> {
     return this.personalitiesService.findOne(req.workspaceId, id);
   }
 
-  /**
-   * Create a new personality
-   */
   @Post()
-  async create(@Req() req: any, @Body() dto: CreatePersonalityDto): Promise<Personality> {
+  @HttpCode(HttpStatus.CREATED)
+  async create(@Req() req: AuthenticatedRequest, @Body() dto: CreatePersonalityDto): Promise<Personality> {
     return this.personalitiesService.create(req.workspaceId, dto);
   }
 
-  /**
-   * Update an existing personality
-   */
   @Put(":id")
   async update(
-    @Req() req: any,
+    @Req() req: AuthenticatedRequest,
     @Param("id") id: string,
     @Body() dto: UpdatePersonalityDto,
   ): Promise<Personality> {
     return this.personalitiesService.update(req.workspaceId, id, dto);
   }
 
-  /**
-   * Delete a personality
-   */
   @Delete(":id")
-  async remove(@Req() req: any, @Param("id") id: string): Promise<Personality> {
+  @HttpCode(HttpStatus.OK)
+  async remove(@Req() req: AuthenticatedRequest, @Param("id") id: string): Promise<Personality> {
     return this.personalitiesService.remove(req.workspaceId, id);
   }
+
+  @Post(":id/preview")
+  async previewPrompt(
+    @Req() req: AuthenticatedRequest,
+    @Param("id") id: string,
+    @Body() context?: PromptContext,
+  ): Promise<{ systemPrompt: string }> {
+    const personality = await this.personalitiesService.findOne(req.workspaceId, id);
+    const { systemPrompt } = this.promptFormatter.formatPrompt(personality, context);
+    return { systemPrompt };
+  }
 }

apps/api/src/personalities/personalities.module.ts

@@ -3,11 +3,12 @@ import { PrismaModule } from "../prisma/prisma.module";
 import { AuthModule } from "../auth/auth.module";
 import { PersonalitiesService } from "./personalities.service";
 import { PersonalitiesController } from "./personalities.controller";
+import { PromptFormatterService } from "./services/prompt-formatter.service";
 
 @Module({
   imports: [PrismaModule, AuthModule],
   controllers: [PersonalitiesController],
-  providers: [PersonalitiesService],
+  providers: [PersonalitiesService, PromptFormatterService],
-  exports: [PersonalitiesService],
+  exports: [PersonalitiesService, PromptFormatterService],
 })
 export class PersonalitiesModule {}

apps/api/src/personalities/services/index.ts

@@ -0,0 +1 @@
+export * from "./prompt-formatter.service";

apps/api/src/personalities/services/prompt-formatter.service.spec.ts

@@ -0,0 +1,108 @@
+import { describe, it, expect, beforeEach } from "vitest";
+import { Test, TestingModule } from "@nestjs/testing";
+import { PromptFormatterService, PromptContext } from "./prompt-formatter.service";
+
+describe("PromptFormatterService", () => {
+  let service: PromptFormatterService;
+
+  const mockPersonality = {
+    id: "personality-123",
+    workspaceId: "workspace-123",
+    name: "Professional",
+    description: "Professional communication style",
+    tone: "professional",
+    formalityLevel: "FORMAL" as const,
+    systemPromptTemplate: "You are a helpful assistant for {{userName}} at {{workspaceName}}.",
+    isDefault: true,
+    isActive: true,
+    createdAt: new Date(),
+    updatedAt: new Date(),
+  };
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [PromptFormatterService],
+    }).compile();
+
+    service = module.get<PromptFormatterService>(PromptFormatterService);
+  });
+
+  describe("formatPrompt", () => {
+    it("should format prompt with context variables", () => {
+      const context: PromptContext = { userName: "John", workspaceName: "Acme Corp" };
+      const result = service.formatPrompt(mockPersonality, context);
+      expect(result.systemPrompt).toContain("John");
+      expect(result.systemPrompt).toContain("Acme Corp");
+      expect(result.metadata.personalityId).toBe(mockPersonality.id);
+    });
+
+    it("should add formality modifier", () => {
+      const result = service.formatPrompt(mockPersonality);
+      expect(result.systemPrompt).toContain("professional");
+    });
+
+    it("should include metadata", () => {
+      const result = service.formatPrompt(mockPersonality);
+      expect(result.metadata.formattedAt).toBeInstanceOf(Date);
+      expect(result.metadata.tone).toBe("professional");
+    });
+
+    it("should handle custom context variables", () => {
+      const personality = { ...mockPersonality, systemPromptTemplate: "Custom: {{customVar}}" };
+      const context: PromptContext = { custom: { customVar: "test-value" } };
+      const result = service.formatPrompt(personality, context);
+      expect(result.systemPrompt).toContain("test-value");
+    });
+  });
+
+  describe("buildSystemPrompt", () => {
+    it("should build complete prompt with context", () => {
+      const context: PromptContext = { userName: "Jane" };
+      const result = service.buildSystemPrompt(mockPersonality, context);
+      expect(result).toContain("Jane");
+    });
+
+    it("should include date/time when requested", () => {
+      const context: PromptContext = { currentDate: "2024-01-29", currentTime: "14:30", timezone: "UTC" };
+      const result = service.buildSystemPrompt(mockPersonality, context, { includeDateTime: true });
+      expect(result).toContain("2024-01-29");
+      expect(result).toContain("14:30");
+    });
+
+    it("should include additional instructions", () => {
+      const result = service.buildSystemPrompt(mockPersonality, undefined, {
+        additionalInstructions: "Be concise.",
+      });
+      expect(result).toContain("Be concise.");
+    });
+  });
+
+  describe("validateTemplate", () => {
+    it("should validate known variables", () => {
+      const template = "Hello {{userName}}, welcome to {{workspaceName}}!";
+      const result = service.validateTemplate(template);
+      expect(result.valid).toBe(true);
+    });
+
+    it("should report unknown variables", () => {
+      const template = "Hello {{unknownVar}}!";
+      const result = service.validateTemplate(template);
+      expect(result.valid).toBe(false);
+      expect(result.missingVariables).toContain("unknownVar");
+    });
+
+    it("should allow custom_ prefixed variables", () => {
+      const template = "Value: {{custom_myVar}}";
+      const result = service.validateTemplate(template);
+      expect(result.valid).toBe(true);
+    });
+  });
+
+  describe("getFormalityLevels", () => {
+    it("should return all formality levels", () => {
+      const levels = service.getFormalityLevels();
+      expect(levels).toHaveLength(5);
+      expect(levels.map((l) => l.level)).toContain("FORMAL");
+    });
+  });
+});

apps/api/src/personalities/services/prompt-formatter.service.ts

@@ -0,0 +1,137 @@
+import { Injectable } from "@nestjs/common";
+import { FormalityLevel } from "@prisma/client";
+import { Personality } from "../entities/personality.entity";
+
+export interface PromptContext {
+  userName?: string;
+  workspaceName?: string;
+  currentDate?: string;
+  currentTime?: string;
+  timezone?: string;
+  custom?: Record<string, string>;
+}
+
+export interface FormattedPrompt {
+  systemPrompt: string;
+  metadata: {
+    personalityId: string;
+    personalityName: string;
+    tone: string;
+    formalityLevel: FormalityLevel;
+    formattedAt: Date;
+  };
+}
+
+const FORMALITY_MODIFIERS: Record<FormalityLevel, string> = {
+  VERY_CASUAL: "Be extremely relaxed and friendly. Use casual language, contractions, and even emojis when appropriate.",
+  CASUAL: "Be friendly and approachable. Use conversational language and a warm tone.",
+  NEUTRAL: "Be professional yet approachable. Balance formality with friendliness.",
+  FORMAL: "Be professional and respectful. Use proper grammar and formal language.",
+  VERY_FORMAL: "Be highly professional and formal. Use precise language and maintain a respectful, business-like demeanor.",
+};
+
+@Injectable()
+export class PromptFormatterService {
+  formatPrompt(personality: Personality, context?: PromptContext): FormattedPrompt {
+    let prompt = personality.systemPromptTemplate;
+    prompt = this.interpolateVariables(prompt, context);
+
+    if (!prompt.toLowerCase().includes("formality") && !prompt.toLowerCase().includes(personality.formalityLevel.toLowerCase())) {
+      const modifier = FORMALITY_MODIFIERS[personality.formalityLevel];
+      prompt = `${prompt}\n\n${modifier}`;
+    }
+
+    if (!prompt.toLowerCase().includes(personality.tone.toLowerCase())) {
+      prompt = `${prompt}\n\nMaintain a ${personality.tone} tone throughout the conversation.`;
+    }
+
+    return {
+      systemPrompt: prompt.trim(),
+      metadata: {
+        personalityId: personality.id,
+        personalityName: personality.name,
+        tone: personality.tone,
+        formalityLevel: personality.formalityLevel,
+        formattedAt: new Date(),
+      },
+    };
+  }
+
+  buildSystemPrompt(
+    personality: Personality,
+    context?: PromptContext,
+    options?: { includeDateTime?: boolean; additionalInstructions?: string },
+  ): string {
+    const { systemPrompt } = this.formatPrompt(personality, context);
+    const parts: string[] = [systemPrompt];
+
+    if (options?.includeDateTime === true) {
+      const now = new Date();
+      const dateStr = context?.currentDate ?? now.toISOString().split("T")[0];
+      const timeStr = context?.currentTime ?? now.toTimeString().slice(0, 5);
+      const tzStr = context?.timezone ?? Intl.DateTimeFormat().resolvedOptions().timeZone;
+      parts.push(`Current date: ${dateStr}, Time: ${timeStr} (${tzStr})`);
+    }
+
+    if (options?.additionalInstructions !== undefined && options.additionalInstructions.length > 0) {
+      parts.push(options.additionalInstructions);
+    }
+
+    return parts.join("\n\n");
+  }
+
+  private interpolateVariables(template: string, context?: PromptContext): string {
+    if (context === undefined) {
+      return template;
+    }
+
+    let result = template;
+
+    if (context.userName !== undefined) {
+      result = result.replace(/\{\{userName\}\}/g, context.userName);
+    }
+    if (context.workspaceName !== undefined) {
+      result = result.replace(/\{\{workspaceName\}\}/g, context.workspaceName);
+    }
+    if (context.currentDate !== undefined) {
+      result = result.replace(/\{\{currentDate\}\}/g, context.currentDate);
+    }
+    if (context.currentTime !== undefined) {
+      result = result.replace(/\{\{currentTime\}\}/g, context.currentTime);
+    }
+    if (context.timezone !== undefined) {
+      result = result.replace(/\{\{timezone\}\}/g, context.timezone);
+    }
+
+    if (context.custom !== undefined) {
+      for (const [key, value] of Object.entries(context.custom)) {
+        const regex = new RegExp(`\\{\\{${key}\\}\\}`, "g");
+        result = result.replace(regex, value);
+      }
+    }
+
+    return result;
+  }
+
+  validateTemplate(template: string): { valid: boolean; missingVariables: string[] } {
+    const variablePattern = /\{\{(\w+)\}\}/g;
+    const matches = template.matchAll(variablePattern);
+    const variables = Array.from(matches, (m) => m[1]);
+
+    const allowedVariables = new Set(["userName", "workspaceName", "currentDate", "currentTime", "timezone"]);
+
+    const unknownVariables = variables.filter((v) => !allowedVariables.has(v) && !v.startsWith("custom_"));
+
+    return {
+      valid: unknownVariables.length === 0,
+      missingVariables: unknownVariables,
+    };
+  }
+
+  getFormalityLevels(): Array<{ level: FormalityLevel; description: string }> {
+    return Object.entries(FORMALITY_MODIFIERS).map(([level, description]) => ({
+      level: level as FormalityLevel,
+      description,
+    }));
+  }
+}