const { testDocRef } = TestHelpers.firestore;

describe('firestore()', () => {
  describe('runTransaction()', () => {
    it('should set() values', async () => {
      const firestore = firebase.firestore();
      const docRef = testDocRef('tSet');

      const updateFunction = async transaction => {
        const doc = await transaction.get(docRef);
        if (!doc.exists) {
          transaction.set(docRef, { value: 1, somethingElse: 'set' });
          return 1;
        }

        return 0;
      };

      const result = await firestore.runTransaction(updateFunction);
      should.equal(result, 1);
      const finalDoc = await docRef.get();
      finalDoc.data().value.should.equal(1);
      finalDoc.data().somethingElse.should.equal('set');
    });

    it('should update() values', async () => {
      const firestore = firebase.firestore();
      const docRef = testDocRef('tUpdate');

      await docRef.set({ value: 1 });

      const updateFunction = async transaction => {
        const doc = await transaction.get(docRef);
        if (doc.exists) {
          transaction.update(docRef, {
            value: doc.data().value + 1,
            somethingElse: 'update',
          });
          return 1;
        }

        return 0;
      };

      const result = await firestore.runTransaction(updateFunction);
      should.equal(result, 1);

      const finalDoc = await docRef.get();
      finalDoc.data().value.should.equal(2);
      finalDoc.data().somethingElse.should.equal('update');
    });

    it('should delete() values', async () => {
      const firestore = firebase.firestore();
      const docRef = testDocRef('tDelete');
      await docRef.set({ value: 1, somethingElse: 'delete' });

      const updateFunction = async transaction => {
        const doc = await transaction.get(docRef);
        if (doc.exists) {
          transaction.delete(docRef);
          return 1;
        }

        return 0;
      };

      const result = await firestore.runTransaction(updateFunction);
      should.equal(result, 1);

      const finalDoc = await docRef.get();
      finalDoc.exists.should.equal(false);
    });

    it('error if updateFn does return a promise', async () => {
      const firestore = firebase.firestore();

      // test async functions - they always return a promise in JS
      let didReject = false;
      let updateFunction = async () => 1;
      try {
        await firestore.runTransaction(updateFunction);
      } catch (e) {
        didReject = true;
      }
      should.equal(didReject, false);

      // should not error as a promise returned
      didReject = false;
      updateFunction = () => Promise.resolve();
      try {
        await firestore.runTransaction(updateFunction);
      } catch (e) {
        didReject = true;
      }
      should.equal(didReject, false);

      // should error as no promise returned
      didReject = false;
      updateFunction = () => '123456';
      try {
        await firestore.runTransaction(updateFunction);
      } catch (e) {
        didReject = true;
        e.message.includes('must return a Promise');
      }
      should.equal(didReject, true);
    });

    it('updateFn promise rejections / js exceptions handled', async () => {
      const firestore = firebase.firestore();

      // rejections
      let didReject = false;
      // eslint-disable-next-line
      let updateFunction = () => Promise.reject('shoop');
      try {
        await firestore.runTransaction(updateFunction);
      } catch (e) {
        didReject = true;
        should.equal(e, 'shoop');
      }
      should.equal(didReject, true);

      // exceptions
      didReject = false;
      updateFunction = () => {
        // eslint-disable-next-line no-throw-literal
        throw 'doop';
      };
      try {
        await firestore.runTransaction(updateFunction);
      } catch (e) {
        didReject = true;
        should.equal(e, 'doop');
      }
      should.equal(didReject, true);
    });

    it('handle native exceptions', async () => {
      const firestore = firebase.firestore();
      const docRef = testDocRef('tSet');
      const blockedRef = firestore.doc('denied/foo');

      const updateFunction = async transaction => {
        await transaction.get(docRef);
        transaction.set(blockedRef, { value: 1, somethingElse: 'set' });
        return 1;
      };

      // rejections
      let didReject = false;
      try {
        await firestore.runTransaction(updateFunction);
      } catch (e) {
        // TODO sdks are giving different errors - standardise?
        if (device.getPlatform() === 'ios') {
          e.message.should.containEql('firestore/failed-precondition');
        } else {
          e.message.should.containEql('firestore/aborted');
        }
        didReject = true;
      }
      should.equal(didReject, true);
    });
  });
});