import { describe, it, expect, beforeEach } from "bun:test";
import { createTestDb } from "../helpers/db.ts";
import {
  getAllItems,
  getItemById,
  createItem,
  updateItem,
  deleteItem,
} from "../../src/server/services/item.service.ts";

describe("Item Service", () => {
  let db: ReturnType<typeof createTestDb>;

  beforeEach(() => {
    db = createTestDb();
  });

  describe("createItem", () => {
    it("creates item with all fields, returns item with id and timestamps", () => {
      const item = createItem(
        db,
        {
          name: "Tent",
          weightGrams: 1200,
          priceCents: 35000,
          categoryId: 1,
          notes: "Ultralight 2-person",
          productUrl: "https://example.com/tent",
        },
      );

      expect(item).toBeDefined();
      expect(item!.id).toBeGreaterThan(0);
      expect(item!.name).toBe("Tent");
      expect(item!.weightGrams).toBe(1200);
      expect(item!.priceCents).toBe(35000);
      expect(item!.categoryId).toBe(1);
      expect(item!.notes).toBe("Ultralight 2-person");
      expect(item!.productUrl).toBe("https://example.com/tent");
      expect(item!.createdAt).toBeDefined();
      expect(item!.updatedAt).toBeDefined();
    });

    it("only name and categoryId are required, other fields optional", () => {
      const item = createItem(db, { name: "Spork", categoryId: 1 });

      expect(item).toBeDefined();
      expect(item!.name).toBe("Spork");
      expect(item!.weightGrams).toBeNull();
      expect(item!.priceCents).toBeNull();
      expect(item!.notes).toBeNull();
      expect(item!.productUrl).toBeNull();
    });
  });

  describe("getAllItems", () => {
    it("returns all items with category info joined", () => {
      createItem(db, { name: "Tent", categoryId: 1 });
      createItem(db, { name: "Sleeping Bag", categoryId: 1 });

      const all = getAllItems(db);
      expect(all).toHaveLength(2);
      expect(all[0].categoryName).toBe("Uncategorized");
      expect(all[0].categoryEmoji).toBeDefined();
    });
  });

  describe("getItemById", () => {
    it("returns single item or null", () => {
      const created = createItem(db, { name: "Tent", categoryId: 1 });
      const found = getItemById(db, created!.id);
      expect(found).toBeDefined();
      expect(found!.name).toBe("Tent");

      const notFound = getItemById(db, 9999);
      expect(notFound).toBeNull();
    });
  });

  describe("updateItem", () => {
    it("updates specified fields, sets updatedAt", () => {
      const created = createItem(db, {
        name: "Tent",
        weightGrams: 1200,
        categoryId: 1,
      });

      const updated = updateItem(db, created!.id, {
        name: "Big Agnes Tent",
        weightGrams: 1100,
      });

      expect(updated).toBeDefined();
      expect(updated!.name).toBe("Big Agnes Tent");
      expect(updated!.weightGrams).toBe(1100);
    });

    it("returns null for non-existent id", () => {
      const result = updateItem(db, 9999, { name: "Ghost" });
      expect(result).toBeNull();
    });
  });

  describe("deleteItem", () => {
    it("removes item from DB, returns deleted item", () => {
      const created = createItem(db, {
        name: "Tent",
        categoryId: 1,
        imageFilename: "tent.jpg",
      });

      const deleted = deleteItem(db, created!.id);
      expect(deleted).toBeDefined();
      expect(deleted!.name).toBe("Tent");
      expect(deleted!.imageFilename).toBe("tent.jpg");

      // Verify it's gone
      const found = getItemById(db, created!.id);
      expect(found).toBeNull();
    });

    it("returns null for non-existent id", () => {
      const result = deleteItem(db, 9999);
      expect(result).toBeNull();
    });
  });
});