// @flow

import configureMockStore from "redux-mock-store";
import thunk from "redux-thunk";
import fetchMock from "fetch-mock";
import {
  FETCH_CHANGESETS,
  FETCH_CHANGESETS_FAILURE,
  FETCH_CHANGESETS_PENDING,
  FETCH_CHANGESETS_SUCCESS,
  fetchChangesetsByNamespaceAndName,
  fetchChangesetsByNamespaceNameAndBranch,
  fetchChangesetsSuccess,
  getChangesets,
  getFetchChangesetsFailure,
  isFetchChangesetsPending
} from "./changesets";
import reducer from "./changesets";

const collection = {};

describe("changesets", () => {
  describe("fetching of changesets", () => {
    const DEFAULT_BRANCH_URL = "/api/rest/v2/repositories/foo/bar/changesets";
    const SPECIFIC_BRANCH_URL = "/api/rest/v2/repositories/foo/bar/branches/specific/changesets";
    const mockStore = configureMockStore([thunk]);

    afterEach(() => {
      fetchMock.reset();
      fetchMock.restore();
    });

    it("should fetch changesets for default branch", () => {
      fetchMock.getOnce(DEFAULT_BRANCH_URL, "{}");

      const expectedActions = [
        {
          type: FETCH_CHANGESETS_PENDING, payload: {namespace: "foo", name: "bar"},
          itemId: "foo/bar"
        },
        {
          type: FETCH_CHANGESETS_SUCCESS,
          payload: {collection, namespace: "foo", name: "bar"},
          itemId: "foo/bar"
        }
      ];

      const store = mockStore({});
      return store.dispatch(fetchChangesetsByNamespaceAndName("foo", "bar")).then(() => {
        expect(store.getActions()).toEqual(expectedActions);
      });
    });

    it("should fetch changesets for specific branch", () => {
      fetchMock.getOnce(SPECIFIC_BRANCH_URL, "{}");

      const expectedActions = [
        {
          type: FETCH_CHANGESETS_PENDING, payload: {namespace: "foo", name: "bar", branch: "specific"},
          itemId: "foo/bar/specific"
        },
        {
          type: FETCH_CHANGESETS_SUCCESS,
          payload: {collection, namespace: "foo", name: "bar", branch: "specific"},
          itemId: "foo/bar/specific"
        }
      ];

      const store = mockStore({});
      return store.dispatch(fetchChangesetsByNamespaceNameAndBranch("foo", "bar", "specific")).then(() => {
        expect(store.getActions()).toEqual(expectedActions);
      });
    });

    it("should fail fetching changesets on error", () => {
      fetchMock.getOnce(DEFAULT_BRANCH_URL, 500);

      const expectedActions = [
        {
          type: FETCH_CHANGESETS_PENDING, payload: {namespace: "foo", name: "bar"},
          itemId: "foo/bar"
        },
        {
          type: FETCH_CHANGESETS_SUCCESS,
          payload: {collection, namespace: "foo", name: "bar"},
          itemId: "foo/bar"
        }
      ];

      const store = mockStore({});
      return store.dispatch(fetchChangesetsByNamespaceAndName("foo", "bar")).then(() => {
        expect(store.getActions()[0]).toEqual(expectedActions[0]);
        expect(store.getActions()[1].type).toEqual(FETCH_CHANGESETS_FAILURE);
        expect(store.getActions()[1].payload).toBeDefined();
      });
    })

    it("should fail fetching changesets for specific branch on error", () => {
      fetchMock.getOnce(SPECIFIC_BRANCH_URL, 500);

      const expectedActions = [
        {
          type: FETCH_CHANGESETS_PENDING, payload: {namespace: "foo", name: "bar", branch: "specific"},
          itemId: "foo/bar/specific"
        },
        {
          type: FETCH_CHANGESETS_SUCCESS,
          payload: {collection, namespace: "foo", name: "bar", branch: "specific"},
          itemId: "foo/bar/specific"
        }
      ];

      const store = mockStore({});
      return store.dispatch(fetchChangesetsByNamespaceNameAndBranch("foo", "bar", "specific")).then(() => {
        expect(store.getActions()[0]).toEqual(expectedActions[0]);
        expect(store.getActions()[1].type).toEqual(FETCH_CHANGESETS_FAILURE);
        expect(store.getActions()[1].payload).toBeDefined();
      });
    })
  });

  describe("changesets reducer", () => {
    const responseBody = {
      _embedded: {
        changesets: [
          {id: "changeset1", author: {mail: "z@phod.com", name: "zaphod"}},
          {id: "changeset2", description: "foo"},
          {id: "changeset3", description: "bar"},
        ],
        _embedded: {
          tags: [],
          branches: [],
          parents: []
        }
      }
    };

    it("should set state to received changesets", () => {
      const newState = reducer({}, fetchChangesetsSuccess(responseBody, "foo", "bar"));
      expect(newState).toBeDefined();
      expect(newState["foo/bar"].byId["changeset1"].author.mail).toEqual("z@phod.com");
      expect(newState["foo/bar"].byId["changeset2"].description).toEqual("foo");
      expect(newState["foo/bar"].byId["changeset3"].description).toEqual("bar");
    });

    it("should not delete existing changesets from state", () => {
      const responseBody = {
        _embedded: {
          changesets: [
            {id: "changeset1", author: {mail: "z@phod.com", name: "zaphod"}},
          ],
          _embedded: {
            tags: [],
            branches: [],
            parents: []
          }
        }
      };
      const newState = reducer({
        "foo/bar": {
          byId: {
            ["changeset2"]: {
              id: "changeset2",
              author: {mail: "mail@author.com", name: "author"}
            }
          }
        }
      }, fetchChangesetsSuccess(responseBody, "foo", "bar"));
      expect(newState["foo/bar"].byId["changeset2"]).toBeDefined();
      expect(newState["foo/bar"].byId["changeset1"]).toBeDefined();
    })
  });

  describe("changeset selectors", () => {
    const error = new Error("Something went wrong");

    it("should get all changesets for a given namespace and name", () => {
      const state = {
        changesets: {
          ["foo/bar"]: {
            byId: {
              "id1": {id: "id1"},
              "id2": {id: "id2"}
            }
          }
        }
      };
      const result = getChangesets(state, "foo", "bar" );
      expect(result).toContainEqual({id: "id1"})
    });

    it("should return true, when fetching changesets is pending", () => {
      const state = {
        pending: {
          [FETCH_CHANGESETS + "/foo/bar"]: true
        }
      };

      expect(isFetchChangesetsPending(state, "foo", "bar")).toBeTruthy();
    });

    it("should return false, when fetching changesets is not pending", () => {
      expect(isFetchChangesetsPending({}, "foo", "bar")).toEqual(false);
    });

    it("should return error if fetching changesets failed", () => {
      const state = {
        failure: {
          [FETCH_CHANGESETS + "/foo/bar"]: error
        }
      };

      expect(getFetchChangesetsFailure(state, "foo", "bar")).toEqual(error);
    });

    it("should return false if fetching changesets did not fail", () => {
      expect(getFetchChangesetsFailure({}, "foo", "bar")).toBeUndefined();
    })

  });
});