import { beforeEach, describe, expect, it } from "bun:test";
import { eq } from "drizzle-orm";
import { items } from "../../src/db/schema.ts";
import {
	createCategory,
	deleteCategory,
	getAllCategories,
	updateCategory,
} from "../../src/server/services/category.service.ts";
import { createItem } from "../../src/server/services/item.service.ts";
import { createSecondTestUser, createTestDb } from "../helpers/db.ts";

describe("Category Service", () => {
	let db: any;
	let userId: number;

	beforeEach(async () => {
		({ db, userId } = await createTestDb());
	});

	describe("createCategory", () => {
		it("creates with name and icon", async () => {
			const cat = await createCategory(db, userId, {
				name: "Shelter",
				icon: "tent",
			});

			expect(cat).toBeDefined();
			expect(cat?.id).toBeGreaterThan(0);
			expect(cat?.name).toBe("Shelter");
			expect(cat?.icon).toBe("tent");
		});

		it("uses default icon if not provided", async () => {
			const cat = await createCategory(db, userId, { name: "Cooking" });

			expect(cat).toBeDefined();
			expect(cat?.icon).toBe("package");
		});
	});

	describe("getAllCategories", () => {
		it("returns all categories", async () => {
			await createCategory(db, userId, { name: "Shelter", icon: "tent" });
			await createCategory(db, userId, {
				name: "Cooking",
				icon: "cooking-pot",
			});

			const all = await getAllCategories(db, userId);
			// Includes seeded Uncategorized + 2 new
			expect(all.length).toBeGreaterThanOrEqual(3);
		});
	});

	describe("updateCategory", () => {
		it("renames category", async () => {
			const cat = await createCategory(db, userId, {
				name: "Shelter",
				icon: "tent",
			});
			const updated = await updateCategory(db, userId, cat?.id, {
				name: "Sleep System",
			});

			expect(updated).toBeDefined();
			expect(updated?.name).toBe("Sleep System");
			expect(updated?.icon).toBe("tent");
		});

		it("changes icon", async () => {
			const cat = await createCategory(db, userId, {
				name: "Shelter",
				icon: "tent",
			});
			const updated = await updateCategory(db, userId, cat?.id, {
				icon: "home",
			});

			expect(updated).toBeDefined();
			expect(updated?.icon).toBe("home");
		});

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

	describe("deleteCategory", () => {
		it("reassigns items to Uncategorized then deletes", async () => {
			const shelter = await createCategory(db, userId, {
				name: "Shelter",
				icon: "tent",
			});
			await createItem(db, userId, {
				name: "Tent",
				categoryId: shelter?.id,
			});
			await createItem(db, userId, {
				name: "Tarp",
				categoryId: shelter?.id,
			});

			const result = await deleteCategory(db, userId, shelter?.id);
			expect(result.success).toBe(true);

			// Items should now be in the Uncategorized category (id=1 for first user)
			const reassigned = await db
				.select()
				.from(items)
				.where(eq(items.categoryId, 1));
			expect(reassigned).toHaveLength(2);
			expect(reassigned.map((i: any) => i.name).sort()).toEqual([
				"Tarp",
				"Tent",
			]);
		});

		it("cannot delete Uncategorized", async () => {
			const result = await deleteCategory(db, userId, 1);
			expect(result.success).toBe(false);
			expect(result.error).toBeDefined();
		});
	});

	describe("composite unique constraint", () => {
		it("two users can have categories with the same name", async () => {
			const userId2 = await createSecondTestUser(db);

			const cat1 = await createCategory(db, userId, {
				name: "Cycling",
				icon: "bike",
			});
			const cat2 = await createCategory(db, userId2, {
				name: "Cycling",
				icon: "bike",
			});

			expect(cat1).toBeDefined();
			expect(cat2).toBeDefined();
			expect(cat1?.name).toBe("Cycling");
			expect(cat2?.name).toBe("Cycling");
			expect(cat1?.id).not.toBe(cat2?.id);
		});
	});
});