import { describe, it, expect, beforeEach } from "bun:test";
import { createTestDb } from "../helpers/db.ts";
import {
  getAllSetups,
  getSetupWithItems,
  createSetup,
  updateSetup,
  deleteSetup,
  syncSetupItems,
  removeSetupItem,
} from "../../src/server/services/setup.service.ts";
import { createItem } from "../../src/server/services/item.service.ts";

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

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

  describe("createSetup", () => {
    it("creates setup with name, returns setup with id/timestamps", () => {
      const setup = createSetup(db, { name: "Day Hike" });

      expect(setup).toBeDefined();
      expect(setup.id).toBeGreaterThan(0);
      expect(setup.name).toBe("Day Hike");
      expect(setup.createdAt).toBeDefined();
      expect(setup.updatedAt).toBeDefined();
    });
  });

  describe("getAllSetups", () => {
    it("returns setups with itemCount, totalWeight, totalCost", () => {
      const setup = createSetup(db, { name: "Backpacking" });
      const item1 = createItem(db, {
        name: "Tent",
        categoryId: 1,
        weightGrams: 1200,
        priceCents: 30000,
      });
      const item2 = createItem(db, {
        name: "Sleeping Bag",
        categoryId: 1,
        weightGrams: 800,
        priceCents: 20000,
      });
      syncSetupItems(db, setup.id, [item1.id, item2.id]);

      const setups = getAllSetups(db);
      expect(setups).toHaveLength(1);
      expect(setups[0].name).toBe("Backpacking");
      expect(setups[0].itemCount).toBe(2);
      expect(setups[0].totalWeight).toBe(2000);
      expect(setups[0].totalCost).toBe(50000);
    });

    it("returns 0 for weight/cost when setup has no items", () => {
      createSetup(db, { name: "Empty Setup" });

      const setups = getAllSetups(db);
      expect(setups).toHaveLength(1);
      expect(setups[0].itemCount).toBe(0);
      expect(setups[0].totalWeight).toBe(0);
      expect(setups[0].totalCost).toBe(0);
    });
  });

  describe("getSetupWithItems", () => {
    it("returns setup with full item details and category info", () => {
      const setup = createSetup(db, { name: "Day Hike" });
      const item = createItem(db, {
        name: "Water Bottle",
        categoryId: 1,
        weightGrams: 200,
        priceCents: 2500,
      });
      syncSetupItems(db, setup.id, [item.id]);

      const result = getSetupWithItems(db, setup.id);
      expect(result).toBeDefined();
      expect(result!.name).toBe("Day Hike");
      expect(result!.items).toHaveLength(1);
      expect(result!.items[0].name).toBe("Water Bottle");
      expect(result!.items[0].categoryName).toBe("Uncategorized");
      expect(result!.items[0].categoryEmoji).toBeDefined();
    });

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

  describe("updateSetup", () => {
    it("updates setup name, returns updated setup", () => {
      const setup = createSetup(db, { name: "Original" });
      const updated = updateSetup(db, setup.id, { name: "Renamed" });

      expect(updated).toBeDefined();
      expect(updated!.name).toBe("Renamed");
    });

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

  describe("deleteSetup", () => {
    it("removes setup and cascades to setup_items", () => {
      const setup = createSetup(db, { name: "To Delete" });
      const item = createItem(db, { name: "Item", categoryId: 1 });
      syncSetupItems(db, setup.id, [item.id]);

      const deleted = deleteSetup(db, setup.id);
      expect(deleted).toBe(true);

      // Setup gone
      const result = getSetupWithItems(db, setup.id);
      expect(result).toBeNull();
    });

    it("returns false for non-existent setup", () => {
      const result = deleteSetup(db, 9999);
      expect(result).toBe(false);
    });
  });

  describe("syncSetupItems", () => {
    it("sets items for a setup (delete-all + re-insert)", () => {
      const setup = createSetup(db, { name: "Kit" });
      const item1 = createItem(db, { name: "Item 1", categoryId: 1 });
      const item2 = createItem(db, { name: "Item 2", categoryId: 1 });
      const item3 = createItem(db, { name: "Item 3", categoryId: 1 });

      // Initial sync
      syncSetupItems(db, setup.id, [item1.id, item2.id]);
      let result = getSetupWithItems(db, setup.id);
      expect(result!.items).toHaveLength(2);

      // Re-sync with different items
      syncSetupItems(db, setup.id, [item2.id, item3.id]);
      result = getSetupWithItems(db, setup.id);
      expect(result!.items).toHaveLength(2);
      const names = result!.items.map((i: any) => i.name).sort();
      expect(names).toEqual(["Item 2", "Item 3"]);
    });

    it("syncing with empty array clears all items", () => {
      const setup = createSetup(db, { name: "Kit" });
      const item = createItem(db, { name: "Item", categoryId: 1 });
      syncSetupItems(db, setup.id, [item.id]);

      syncSetupItems(db, setup.id, []);
      const result = getSetupWithItems(db, setup.id);
      expect(result!.items).toHaveLength(0);
    });
  });

  describe("removeSetupItem", () => {
    it("removes single item from setup", () => {
      const setup = createSetup(db, { name: "Kit" });
      const item1 = createItem(db, { name: "Item 1", categoryId: 1 });
      const item2 = createItem(db, { name: "Item 2", categoryId: 1 });
      syncSetupItems(db, setup.id, [item1.id, item2.id]);

      removeSetupItem(db, setup.id, item1.id);
      const result = getSetupWithItems(db, setup.id);
      expect(result!.items).toHaveLength(1);
      expect(result!.items[0].name).toBe("Item 2");
    });
  });

  describe("cascade behavior", () => {
    it("deleting a collection item removes it from all setups", () => {
      const setup = createSetup(db, { name: "Kit" });
      const item1 = createItem(db, { name: "Item 1", categoryId: 1 });
      const item2 = createItem(db, { name: "Item 2", categoryId: 1 });
      syncSetupItems(db, setup.id, [item1.id, item2.id]);

      // Delete item1 from collection (need direct DB access)
      const { items: itemsTable } = require("../../src/db/schema.ts");
      const { eq } = require("drizzle-orm");
      db.delete(itemsTable).where(eq(itemsTable.id, item1.id)).run();

      const result = getSetupWithItems(db, setup.id);
      expect(result!.items).toHaveLength(1);
      expect(result!.items[0].name).toBe("Item 2");
    });
  });
});