import { Test, TestingModule } from "@nestjs/testing";
import { AgentTasksService } from "./agent-tasks.service";
import { PrismaService } from "../prisma/prisma.service";
import { AgentTaskStatus, AgentTaskPriority } from "@prisma/client";
import { NotFoundException } from "@nestjs/common";
import { describe, it, expect, beforeEach, vi } from "vitest";

describe("AgentTasksService", () => {
  let service: AgentTasksService;
  let prisma: PrismaService;

  const mockPrismaService = {
    agentTask: {
      create: vi.fn(),
      findMany: vi.fn(),
      findUnique: vi.fn(),
      update: vi.fn(),
      delete: vi.fn(),
      count: vi.fn(),
    },
  };

  beforeEach(async () => {
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        AgentTasksService,
        {
          provide: PrismaService,
          useValue: mockPrismaService,
        },
      ],
    }).compile();

    service = module.get<AgentTasksService>(AgentTasksService);
    prisma = module.get<PrismaService>(PrismaService);

    // Reset mocks
    vi.clearAllMocks();
  });

  describe("create", () => {
    it("should create a new agent task with default values", async () => {
      const workspaceId = "workspace-1";
      const userId = "user-1";
      const createDto = {
        title: "Test Task",
        description: "Test Description",
        agentType: "test-agent",
      };

      const mockTask = {
        id: "task-1",
        workspaceId,
        title: "Test Task",
        description: "Test Description",
        status: AgentTaskStatus.PENDING,
        priority: AgentTaskPriority.MEDIUM,
        agentType: "test-agent",
        agentConfig: {},
        result: null,
        error: null,
        createdById: userId,
        createdAt: new Date(),
        updatedAt: new Date(),
        startedAt: null,
        completedAt: null,
        createdBy: {
          id: userId,
          name: "Test User",
          email: "test@example.com",
        },
      };

      mockPrismaService.agentTask.create.mockResolvedValue(mockTask);

      const result = await service.create(workspaceId, userId, createDto);

      expect(mockPrismaService.agentTask.create).toHaveBeenCalledWith({
        data: expect.objectContaining({
          title: "Test Task",
          description: "Test Description",
          agentType: "test-agent",
          workspaceId,
          createdById: userId,
          status: AgentTaskStatus.PENDING,
          priority: AgentTaskPriority.MEDIUM,
          agentConfig: {},
        }),
        include: {
          createdBy: {
            select: { id: true, name: true, email: true },
          },
        },
      });

      expect(result).toEqual(mockTask);
    });

    it("should set startedAt when status is RUNNING", async () => {
      const workspaceId = "workspace-1";
      const userId = "user-1";
      const createDto = {
        title: "Running Task",
        agentType: "test-agent",
        status: AgentTaskStatus.RUNNING,
      };

      mockPrismaService.agentTask.create.mockResolvedValue({
        id: "task-1",
        startedAt: expect.any(Date),
      });

      await service.create(workspaceId, userId, createDto);

      expect(mockPrismaService.agentTask.create).toHaveBeenCalledWith(
        expect.objectContaining({
          data: expect.objectContaining({
            startedAt: expect.any(Date),
          }),
        })
      );
    });

    it("should set completedAt when status is COMPLETED", async () => {
      const workspaceId = "workspace-1";
      const userId = "user-1";
      const createDto = {
        title: "Completed Task",
        agentType: "test-agent",
        status: AgentTaskStatus.COMPLETED,
      };

      mockPrismaService.agentTask.create.mockResolvedValue({
        id: "task-1",
        completedAt: expect.any(Date),
      });

      await service.create(workspaceId, userId, createDto);

      expect(mockPrismaService.agentTask.create).toHaveBeenCalledWith(
        expect.objectContaining({
          data: expect.objectContaining({
            startedAt: expect.any(Date),
            completedAt: expect.any(Date),
          }),
        })
      );
    });
  });

  describe("findAll", () => {
    it("should return paginated agent tasks", async () => {
      const workspaceId = "workspace-1";
      const query = { workspaceId, page: 1, limit: 10 };

      const mockTasks = [
        { id: "task-1", title: "Task 1" },
        { id: "task-2", title: "Task 2" },
      ];

      mockPrismaService.agentTask.findMany.mockResolvedValue(mockTasks);
      mockPrismaService.agentTask.count.mockResolvedValue(2);

      const result = await service.findAll(query);

      expect(result).toEqual({
        data: mockTasks,
        meta: {
          total: 2,
          page: 1,
          limit: 10,
          totalPages: 1,
        },
      });

      expect(mockPrismaService.agentTask.findMany).toHaveBeenCalledWith({
        where: { workspaceId },
        include: {
          createdBy: {
            select: { id: true, name: true, email: true },
          },
        },
        orderBy: {
          createdAt: "desc",
        },
        skip: 0,
        take: 10,
      });
    });

    it("should apply filters correctly", async () => {
      const workspaceId = "workspace-1";
      const query = {
        workspaceId,
        status: AgentTaskStatus.PENDING,
        priority: AgentTaskPriority.HIGH,
        agentType: "test-agent",
      };

      mockPrismaService.agentTask.findMany.mockResolvedValue([]);
      mockPrismaService.agentTask.count.mockResolvedValue(0);

      await service.findAll(query);

      expect(mockPrismaService.agentTask.findMany).toHaveBeenCalledWith(
        expect.objectContaining({
          where: {
            workspaceId,
            status: AgentTaskStatus.PENDING,
            priority: AgentTaskPriority.HIGH,
            agentType: "test-agent",
          },
        })
      );
    });
  });

  describe("findOne", () => {
    it("should return a single agent task", async () => {
      const id = "task-1";
      const workspaceId = "workspace-1";
      const mockTask = { id, title: "Task 1", workspaceId };

      mockPrismaService.agentTask.findUnique.mockResolvedValue(mockTask);

      const result = await service.findOne(id, workspaceId);

      expect(result).toEqual(mockTask);
      expect(mockPrismaService.agentTask.findUnique).toHaveBeenCalledWith({
        where: { id, workspaceId },
        include: {
          createdBy: {
            select: { id: true, name: true, email: true },
          },
        },
      });
    });

    it("should throw NotFoundException when task not found", async () => {
      const id = "non-existent";
      const workspaceId = "workspace-1";

      mockPrismaService.agentTask.findUnique.mockResolvedValue(null);

      await expect(service.findOne(id, workspaceId)).rejects.toThrow(NotFoundException);
    });
  });

  describe("update", () => {
    it("should update an agent task", async () => {
      const id = "task-1";
      const workspaceId = "workspace-1";
      const updateDto = { title: "Updated Task" };

      const existingTask = {
        id,
        workspaceId,
        status: AgentTaskStatus.PENDING,
        startedAt: null,
      };

      const updatedTask = { ...existingTask, ...updateDto };

      mockPrismaService.agentTask.findUnique.mockResolvedValue(existingTask);
      mockPrismaService.agentTask.update.mockResolvedValue(updatedTask);

      const result = await service.update(id, workspaceId, updateDto);

      expect(result).toEqual(updatedTask);
      expect(mockPrismaService.agentTask.update).toHaveBeenCalledWith({
        where: { id, workspaceId },
        data: updateDto,
        include: {
          createdBy: {
            select: { id: true, name: true, email: true },
          },
        },
      });
    });

    it("should set startedAt when status changes to RUNNING", async () => {
      const id = "task-1";
      const workspaceId = "workspace-1";
      const updateDto = { status: AgentTaskStatus.RUNNING };

      const existingTask = {
        id,
        workspaceId,
        status: AgentTaskStatus.PENDING,
        startedAt: null,
      };

      mockPrismaService.agentTask.findUnique.mockResolvedValue(existingTask);
      mockPrismaService.agentTask.update.mockResolvedValue({
        ...existingTask,
        ...updateDto,
      });

      await service.update(id, workspaceId, updateDto);

      expect(mockPrismaService.agentTask.update).toHaveBeenCalledWith(
        expect.objectContaining({
          data: expect.objectContaining({
            startedAt: expect.any(Date),
          }),
        })
      );
    });

    it("should throw NotFoundException when task not found", async () => {
      const id = "non-existent";
      const workspaceId = "workspace-1";
      const updateDto = { title: "Updated Task" };

      mockPrismaService.agentTask.findUnique.mockResolvedValue(null);

      await expect(service.update(id, workspaceId, updateDto)).rejects.toThrow(NotFoundException);
    });
  });

  describe("remove", () => {
    it("should delete an agent task", async () => {
      const id = "task-1";
      const workspaceId = "workspace-1";
      const mockTask = { id, workspaceId, title: "Task 1" };

      mockPrismaService.agentTask.findUnique.mockResolvedValue(mockTask);
      mockPrismaService.agentTask.delete.mockResolvedValue(mockTask);

      const result = await service.remove(id, workspaceId);

      expect(result).toEqual({ message: "Agent task deleted successfully" });
      expect(mockPrismaService.agentTask.delete).toHaveBeenCalledWith({
        where: { id, workspaceId },
      });
    });

    it("should throw NotFoundException when task not found", async () => {
      const id = "non-existent";
      const workspaceId = "workspace-1";

      mockPrismaService.agentTask.findUnique.mockResolvedValue(null);

      await expect(service.remove(id, workspaceId)).rejects.toThrow(NotFoundException);
    });
  });
});