import { describe, it, expect, vi, beforeEach } from "vitest";
import type { Mock } from "vitest";

// ============================================================
// Mock 外部依赖
// ============================================================

// Mock database —— getDb 返回模拟的 db 对象
const mockDb = {
  insert: vi.fn(),
  select: vi.fn(),
  update: vi.fn(),
  delete: vi.fn(),
};

vi.mock("../../src/config/database.js", () => ({
  getDb: () => mockDb,
}));

// Mock logger（避免 pino 初始化副作用）
vi.mock("../../src/shared/observability/logger.js", () => ({
  logger: {
    info: vi.fn(),
    warn: vi.fn(),
    error: vi.fn(),
    debug: vi.fn(),
  },
}));

// 导入被测模块（在 mock 之后）
import {
  insertNotification,
  insertNotifications,
  findById,
  findByEventId,
  listByUser,
  getUnreadCount,
  markAsRead,
  batchMarkAsRead,
  markAllAsRead,
  recallByGroup,
  deleteById,
} from "../../src/notifications/notifications.repository.js";

// ============================================================
// 辅助：创建 drizzle 链式 mock
// ============================================================

/**
 * 创建一个可链式调用且可 await 的 mock 对象。
 * drizzle 查询构建器方法（from/where/limit/offset/orderBy/values/set）
 * 全部返回链本身，await 时解析为 resolveValue。
 */
function createChain(resolveValue: unknown) {
  const chain: Record<string, unknown> = {
    then(resolve: (v: unknown) => void, reject?: (e: unknown) => void) {
      return Promise.resolve(resolveValue).then(resolve, reject);
    },
  };
  for (const method of [
    "from",
    "where",
    "limit",
    "offset",
    "orderBy",
    "values",
    "set",
  ]) {
    chain[method] = vi.fn().mockReturnValue(chain);
  }
  return chain;
}

// ============================================================
// Tests
// ============================================================

describe("notifications.repository", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  // ----------------------------------------------------------
  // insertNotification
  // ----------------------------------------------------------
  describe("insertNotification", () => {
    it("应插入通知行并返回该行", async () => {
      const chain = createChain(undefined);
      (mockDb.insert as Mock).mockReturnValue(chain);

      const row = {
        id: "notif-1",
        userId: "user-1",
        type: "system" as const,
        title: "Test",
        content: "Content",
        channel: "in_app" as const,
        isRead: false,
        status: "pending" as const,
        metadata: null,
        relatedEntityType: null,
        relatedEntityId: null,
        groupId: null,
        senderId: null,
        templateId: null,
        eventId: null,
      };

      const result = await insertNotification(row);

      expect(mockDb.insert).toHaveBeenCalledTimes(1);
      expect(chain.values).toHaveBeenCalledWith(row);
      expect(result).toEqual(row);
    });
  });

  // ----------------------------------------------------------
  // insertNotifications (batch)
  // ----------------------------------------------------------
  describe("insertNotifications", () => {
    it("应批量插入多行通知", async () => {
      const chain = createChain(undefined);
      (mockDb.insert as Mock).mockReturnValue(chain);

      const rows = [
        {
          id: "notif-1",
          userId: "user-1",
          type: "system" as const,
          title: "T1",
          content: "C1",
          channel: "in_app" as const,
          isRead: false,
          status: "pending" as const,
          metadata: null,
          relatedEntityType: null,
          relatedEntityId: null,
          groupId: null,
          senderId: null,
          templateId: null,
          eventId: null,
        },
        {
          id: "notif-2",
          userId: "user-2",
          type: "exam" as const,
          title: "T2",
          content: "C2",
          channel: "in_app" as const,
          isRead: false,
          status: "pending" as const,
          metadata: null,
          relatedEntityType: null,
          relatedEntityId: null,
          groupId: null,
          senderId: null,
          templateId: null,
          eventId: null,
        },
      ];

      await insertNotifications(rows);

      expect(mockDb.insert).toHaveBeenCalledTimes(1);
      expect(chain.values).toHaveBeenCalledWith(rows);
    });

    it("空数组应直接返回，不调用 db", async () => {
      await insertNotifications([]);

      expect(mockDb.insert).not.toHaveBeenCalled();
    });
  });

  // ----------------------------------------------------------
  // findById
  // ----------------------------------------------------------
  describe("findById", () => {
    it("应根据 id 查询并返回通知行", async () => {
      const mockRow = { id: "notif-1", userId: "user-1", title: "Test" };
      const chain = createChain([mockRow]);
      (mockDb.select as Mock).mockReturnValue(chain);

      const result = await findById("notif-1");

      expect(mockDb.select).toHaveBeenCalledTimes(1);
      expect(chain.from).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);
      expect(chain.limit).toHaveBeenCalledWith(1);
      expect(result).toEqual(mockRow);
    });

    it("未找到时应返回 undefined", async () => {
      const chain = createChain([]);
      (mockDb.select as Mock).mockReturnValue(chain);

      const result = await findById("not-exist");

      expect(result).toBeUndefined();
    });
  });

  // ----------------------------------------------------------
  // findByEventId
  // ----------------------------------------------------------
  describe("findByEventId", () => {
    it("应根据 eventId 查询并返回通知行", async () => {
      const mockRow = { id: "notif-1", eventId: "evt-1", status: "sent" };
      const chain = createChain([mockRow]);
      (mockDb.select as Mock).mockReturnValue(chain);

      const result = await findByEventId("evt-1");

      expect(mockDb.select).toHaveBeenCalledTimes(1);
      expect(chain.from).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);
      expect(chain.limit).toHaveBeenCalledWith(1);
      expect(result).toEqual(mockRow);
    });

    it("未找到时应返回 undefined", async () => {
      const chain = createChain([]);
      (mockDb.select as Mock).mockReturnValue(chain);

      const result = await findByEventId("not-exist");

      expect(result).toBeUndefined();
    });
  });

  // ----------------------------------------------------------
  // listByUser
  // ----------------------------------------------------------
  describe("listByUser", () => {
    it("应分页查询用户通知并返回 items + total", async () => {
      const mockItems = [
        { id: "notif-1", userId: "user-1" },
        { id: "notif-2", userId: "user-1" },
      ];
      const mockCountRow = [{ value: 25 }];

      // 第一次 select → items 查询, 第二次 select → count 查询
      (mockDb.select as Mock)
        .mockReturnValueOnce(createChain(mockItems))
        .mockReturnValueOnce(createChain(mockCountRow));

      const result = await listByUser("user-1", {
        page: 2,
        pageSize: 10,
      });

      expect(result.items).toEqual(mockItems);
      expect(result.total).toBe(25);
      expect(mockDb.select).toHaveBeenCalledTimes(2);
    });

    it("onlyUnread=true 应添加未读过滤条件", async () => {
      const itemsChain = createChain([]);
      const countChain = createChain([{ value: 0 }]);

      (mockDb.select as Mock)
        .mockReturnValueOnce(itemsChain)
        .mockReturnValueOnce(countChain);

      await listByUser("user-1", {
        onlyUnread: true,
        page: 1,
        pageSize: 20,
      });

      // 两次查询都调用 where
      expect(itemsChain.where).toHaveBeenCalledTimes(1);
      expect(countChain.where).toHaveBeenCalledTimes(1);
    });

    it("type 过滤应生效", async () => {
      const itemsChain = createChain([]);
      const countChain = createChain([{ value: 0 }]);

      (mockDb.select as Mock)
        .mockReturnValueOnce(itemsChain)
        .mockReturnValueOnce(countChain);

      await listByUser("user-1", {
        type: "exam",
        page: 1,
        pageSize: 20,
      });

      expect(itemsChain.where).toHaveBeenCalledTimes(1);
      expect(countChain.where).toHaveBeenCalledTimes(1);
    });

    it("count 为 undefined 时 total 应为 0", async () => {
      const itemsChain = createChain([]);
      const countChain = createChain([undefined]);

      (mockDb.select as Mock)
        .mockReturnValueOnce(itemsChain)
        .mockReturnValueOnce(countChain);

      const result = await listByUser("user-1", {
        page: 1,
        pageSize: 10,
      });

      expect(result.total).toBe(0);
    });

    it("offset 应根据 page 和 pageSize 计算", async () => {
      const itemsChain = createChain([]);
      const countChain = createChain([{ value: 0 }]);

      (mockDb.select as Mock)
        .mockReturnValueOnce(itemsChain)
        .mockReturnValueOnce(countChain);

      await listByUser("user-1", {
        page: 3,
        pageSize: 15,
      });

      // offset = (3-1) * 15 = 30
      expect(itemsChain.offset).toHaveBeenCalledWith(30);
    });
  });

  // ----------------------------------------------------------
  // getUnreadCount
  // ----------------------------------------------------------
  describe("getUnreadCount", () => {
    it("应返回用户未读通知数", async () => {
      const chain = createChain([{ value: 7 }]);
      (mockDb.select as Mock).mockReturnValue(chain);

      const result = await getUnreadCount("user-1");

      expect(result).toBe(7);
      expect(mockDb.select).toHaveBeenCalledTimes(1);
      expect(chain.from).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);
    });

    it("无未读时应返回 0", async () => {
      const chain = createChain([undefined]);
      (mockDb.select as Mock).mockReturnValue(chain);

      const result = await getUnreadCount("user-1");

      expect(result).toBe(0);
    });
  });

  // ----------------------------------------------------------
  // markAsRead
  // ----------------------------------------------------------
  describe("markAsRead", () => {
    it("应将指定通知标记为已读", async () => {
      const chain = createChain(undefined);
      (mockDb.update as Mock).mockReturnValue(chain);

      await markAsRead("notif-1", "user-1");

      expect(mockDb.update).toHaveBeenCalledTimes(1);
      expect(chain.set).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);

      // 验证 set 的参数包含 isRead: true
      const setArg = (chain.set as Mock).mock.calls[0][0];
      expect(setArg.isRead).toBe(true);
      expect(setArg.status).toBe("read");
      expect(setArg.readAt).toBeInstanceOf(Date);
    });
  });

  // ----------------------------------------------------------
  // batchMarkAsRead
  // ----------------------------------------------------------
  describe("batchMarkAsRead", () => {
    it("应批量标记多条通知为已读", async () => {
      const chain = createChain(undefined);
      (mockDb.update as Mock).mockReturnValue(chain);

      await batchMarkAsRead(["notif-1", "notif-2", "notif-3"], "user-1");

      expect(mockDb.update).toHaveBeenCalledTimes(1);
      expect(chain.set).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);

      const setArg = (chain.set as Mock).mock.calls[0][0];
      expect(setArg.isRead).toBe(true);
      expect(setArg.status).toBe("read");
    });
  });

  // ----------------------------------------------------------
  // markAllAsRead
  // ----------------------------------------------------------
  describe("markAllAsRead", () => {
    it("应将用户所有未读通知标记为已读，返回受影响行数", async () => {
      const chain = createChain({ affectedRows: 5 });
      (mockDb.update as Mock).mockReturnValue(chain);

      const result = await markAllAsRead("user-1");

      expect(result).toBe(5);
      expect(mockDb.update).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);
    });

    it("before 参数应添加时间过滤条件", async () => {
      const chain = createChain({ affectedRows: 3 });
      (mockDb.update as Mock).mockReturnValue(chain);

      const before = Date.now();
      const result = await markAllAsRead("user-1", before);

      expect(result).toBe(3);
      expect(chain.where).toHaveBeenCalledTimes(1);
    });

    it("无受影响行时应返回 0", async () => {
      const chain = createChain({});
      (mockDb.update as Mock).mockReturnValue(chain);

      const result = await markAllAsRead("user-1");

      expect(result).toBe(0);
    });
  });

  // ----------------------------------------------------------
  // recallByGroup
  // ----------------------------------------------------------
  describe("recallByGroup", () => {
    it("应按 groupId 撤回通知，返回受影响行数", async () => {
      const chain = createChain({ affectedRows: 10 });
      (mockDb.update as Mock).mockReturnValue(chain);

      const result = await recallByGroup("group-1");

      expect(result).toBe(10);
      expect(mockDb.update).toHaveBeenCalledTimes(1);

      const setArg = (chain.set as Mock).mock.calls[0][0];
      expect(setArg.status).toBe("recalled");
    });

    it("无匹配行时应返回 0", async () => {
      const chain = createChain({});
      (mockDb.update as Mock).mockReturnValue(chain);

      const result = await recallByGroup("empty-group");

      expect(result).toBe(0);
    });
  });

  // ----------------------------------------------------------
  // deleteById
  // ----------------------------------------------------------
  describe("deleteById", () => {
    it("应根据 id 删除通知", async () => {
      const chain = createChain(undefined);
      (mockDb.delete as Mock).mockReturnValue(chain);

      await deleteById("notif-1");

      expect(mockDb.delete).toHaveBeenCalledTimes(1);
      expect(chain.where).toHaveBeenCalledTimes(1);
    });
  });
});