import { testSuite, expect } from "manten";
import { Transaction } from "../../../src/transaction";
import { nrml, testCollection } from "../../common";

export default testSuite(async ({ describe, test }) => {
  describe("inserts", ({ test }) => {
    test("will insert and remove on rollback", () => {
      const collection = testCollection();
      collection.insert({ a: 1 });
      collection.insert({ a: 2 });
      collection.insert({ a: 3 });
      const original = collection.find();

      collection.transaction((t) => {
        t.insert({ a: 4 });
        const found = nrml(collection.find({ a: 4 }));
        expect(found).toEqual([{ a: 4 }]);
        t.rollback();
        const found2 = nrml(collection.find({ a: 4 }));
        expect(found2).toEqual([]);
      });

      const latest = collection.find();
      expect(latest).toEqual(original);
    });

    test("will insert many and remove all on rollback", () => {
      const collection = testCollection();
      collection.insert({ a: 1 });
      collection.insert({ a: 2 });
      collection.insert({ a: 3 });
      const original = collection.find();

      collection.transaction((t) => {
        t.insert([{ a: 4 }, { a: 5 }]);
        const found = nrml(collection.find({ a: { $gt: 3 } }));
        expect(found).toEqual([{ a: 4 }, { a: 5 }]);

        t.rollback();

        const found2 = nrml(collection.find({ a: { $gt: 3 } }));
        expect(found2).toEqual([]);
      });

      const latest = collection.find();
      expect(latest).toEqual(original);
    });
  });

  describe("updates", ({ test }) => {
    test("will update and revert on rollback", () => {
      const collection = testCollection();
      collection.insert({ a: 1 });
      collection.insert({ a: 2 });
      collection.insert({ a: 3 });
      const original = collection.find();

      collection.transaction((t) => {
        t.update({ a: 1 }, { $set: { a: 4 } });

        const found = nrml(collection.find({ a: 4 }));
        expect(found).toEqual([{ a: 4 }]);

        t.rollback();

        const found2 = nrml(collection.find({ a: 4 }));
        expect(found2).toEqual([]);

        const found3 = nrml(collection.find({ a: 1 }));
        expect(found3).toEqual([{ a: 1 }]);
      });

      const latest = collection.find();
      expect(latest).toEqual(original);
    });

    test("will update many and revert all on rollback", () => {
      const collection = testCollection();
      collection.insert({ a: 1 });
      collection.insert({ a: 2 });
      collection.insert({ a: 3 });
      const original = collection.find();

      collection.transaction((t) => {
        t.update({ a: { $gt: 1 } }, { $inc: 5 });

        const found = nrml(collection.find({ a: { $gt: 1 } }));
        expect(found).toEqual([{ a: 7 }, { a: 8 }]);

        t.rollback();

        const found2 = nrml(collection.find({ a: { $gt: 3 } }));
        expect(found2).toEqual([]);

        const found3 = nrml(collection.find({ a: { $gt: 0 } }));
        expect(found3).toEqual([{ a: 1 }, { a: 2 }, { a: 3 }]);
      });

      const latest = collection.find();
      expect(latest).toEqual(original);
    });
  });

  describe("removes", ({ test }) => {
    test("will remove and restore on rollback", () => {
      const collection = testCollection();
      collection.insert({ a: 1 });
      collection.insert({ a: 2 });
      collection.insert({ a: 3 });
      const original = collection.find();

      collection.transaction((t) => {
        t.remove({ a: 3 });

        const found = nrml(collection.find({ a: 3 }));
        expect(found).toEqual([]);

        t.rollback();

        const found2 = nrml(collection.find({ a: 3 }));
        expect(found2).toEqual([{ a: 3 }]);
      });

      const latest = collection.find();
      expect(latest).toEqual(original);
    });

    test("will remove many and restore all on rollback", () => {
      const collection = testCollection();
      collection.insert({ a: 1 });
      collection.insert({ a: 2 });
      collection.insert({ a: 3 });
      const original = collection.find();

      collection.transaction((t) => {
        t.remove({ a: { $gt: 1 } });

        const found = nrml(collection.find({ a: { $gt: 1 } }));
        expect(found).toEqual([]);

        t.rollback();

        const found2 = nrml(collection.find({ a: { $gt: 1 } }));
        expect(found2).toEqual([{ a: 2 }, { a: 3 }]);
      });

      const latest = collection.find();
      expect(latest).toEqual(original);
    });
  });

  test("throws if already in a transaction", () => {
    const collection = testCollection();

    collection.transaction((tx) => {
      expect(collection.transaction).toThrow();
    });
  });

  test("throwing inside a transaction rolls it back", () => {
    const collection = testCollection();
    collection.insert({ a: 1 });
    collection.insert({ a: 2 });
    collection.insert({ a: 3 });
    const original = collection.find();

    try {
      collection.transaction((t) => {
        t.insert({ a: 4 });
        throw new Error("test");
      });
    } catch (e) {
      // ignore
    }

    const latest = collection.find();
    expect(latest).toEqual(original);
  });

});