import { beforeEach, describe, expect, it } from "bun:test";
import { globalItems, itemGlobalLinks, items } from "../../src/db/schema.ts";
import {
	getGlobalItemWithOwnerCount,
	linkItemToGlobal,
	searchGlobalItems,
	unlinkItemFromGlobal,
} from "../../src/server/services/global-item.service.ts";
import { seedGlobalItems } from "../../src/db/seed-global-items.ts";
import { createTestDb } from "../helpers/db.ts";

type TestDb = ReturnType<typeof createTestDb>;

function insertGlobalItem(
	db: TestDb,
	data: {
		brand: string;
		model: string;
		category?: string;
		weightGrams?: number;
		priceCents?: number;
	},
) {
	return db
		.insert(globalItems)
		.values({
			brand: data.brand,
			model: data.model,
			category: data.category ?? null,
			weightGrams: data.weightGrams ?? null,
			priceCents: data.priceCents ?? null,
		})
		.returning()
		.get();
}

function insertItem(db: TestDb, name: string) {
	return db
		.insert(items)
		.values({ name, categoryId: 1 })
		.returning()
		.get();
}

describe("Global Item Service", () => {
	let db: TestDb;

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

	describe("searchGlobalItems", () => {
		it("returns all global items when no query provided", () => {
			insertGlobalItem(db, { brand: "Revelate Designs", model: "Terrapin System" });
			insertGlobalItem(db, { brand: "Apidura", model: "Handlebar Pack" });

			const results = searchGlobalItems(db);
			expect(results).toHaveLength(2);
		});

		it("returns items matching brand (case-insensitive)", () => {
			insertGlobalItem(db, { brand: "Revelate Designs", model: "Terrapin System" });
			insertGlobalItem(db, { brand: "Apidura", model: "Handlebar Pack" });

			const results = searchGlobalItems(db, "revelate");
			expect(results).toHaveLength(1);
			expect(results[0].brand).toBe("Revelate Designs");
		});

		it("returns items matching model (case-insensitive)", () => {
			insertGlobalItem(db, { brand: "Revelate Designs", model: "Terrapin System" });
			insertGlobalItem(db, { brand: "Apidura", model: "Handlebar Pack" });

			const results = searchGlobalItems(db, "HANDLEBAR");
			expect(results).toHaveLength(1);
			expect(results[0].model).toBe("Handlebar Pack");
		});

		it("does not match everything with wildcard chars", () => {
			insertGlobalItem(db, { brand: "Revelate Designs", model: "Terrapin System" });
			insertGlobalItem(db, { brand: "Apidura", model: "Handlebar Pack" });

			const results = searchGlobalItems(db, "100%");
			expect(results).toHaveLength(0);
		});
	});

	describe("getGlobalItemWithOwnerCount", () => {
		it("returns item with ownerCount 0 when no links", () => {
			const gi = insertGlobalItem(db, { brand: "MSR", model: "PocketRocket 2" });

			const result = getGlobalItemWithOwnerCount(db, gi.id);
			expect(result).not.toBeNull();
			expect(result!.ownerCount).toBe(0);
			expect(result!.brand).toBe("MSR");
		});

		it("returns ownerCount matching number of linked items", () => {
			const gi = insertGlobalItem(db, { brand: "MSR", model: "PocketRocket 2" });
			const item1 = insertItem(db, "My Stove");
			const item2 = insertItem(db, "Another Stove");

			db.insert(itemGlobalLinks)
				.values({ itemId: item1.id, globalItemId: gi.id })
				.run();
			db.insert(itemGlobalLinks)
				.values({ itemId: item2.id, globalItemId: gi.id })
				.run();

			const result = getGlobalItemWithOwnerCount(db, gi.id);
			expect(result).not.toBeNull();
			expect(result!.ownerCount).toBe(2);
		});

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

	describe("linkItemToGlobal", () => {
		it("creates link and returns link row", () => {
			const gi = insertGlobalItem(db, { brand: "MSR", model: "PocketRocket 2" });
			const item = insertItem(db, "My Stove");

			const link = linkItemToGlobal(db, item.id, gi.id);
			expect(link.itemId).toBe(item.id);
			expect(link.globalItemId).toBe(gi.id);
		});

		it("throws when item already linked", () => {
			const gi = insertGlobalItem(db, { brand: "MSR", model: "PocketRocket 2" });
			const item = insertItem(db, "My Stove");

			linkItemToGlobal(db, item.id, gi.id);
			expect(() => linkItemToGlobal(db, item.id, gi.id)).toThrow();
		});
	});

	describe("unlinkItemFromGlobal", () => {
		it("removes the link", () => {
			const gi = insertGlobalItem(db, { brand: "MSR", model: "PocketRocket 2" });
			const item = insertItem(db, "My Stove");

			linkItemToGlobal(db, item.id, gi.id);
			const deleted = unlinkItemFromGlobal(db, item.id);
			expect(deleted).toBe(1);

			// Verify link is gone
			const result = getGlobalItemWithOwnerCount(db, gi.id);
			expect(result!.ownerCount).toBe(0);
		});
	});

	describe("seedGlobalItems", () => {
		it("inserts seed data on first call", () => {
			seedGlobalItems(db);
			const all = db.select().from(globalItems).all();
			expect(all.length).toBeGreaterThan(0);
		});

		it("is idempotent on second call", () => {
			seedGlobalItems(db);
			const countAfterFirst = db.select().from(globalItems).all().length;

			seedGlobalItems(db);
			const countAfterSecond = db.select().from(globalItems).all().length;

			expect(countAfterSecond).toBe(countAfterFirst);
		});
	});
});