package app

import (
	"net/http"
	"testing"

	"github.com/xanzy/go-gitlab"
)

type fakeMergeCreatorClient struct {
	testBase
}

func (f fakeMergeCreatorClient) CreateMergeRequest(pid interface{}, opt *gitlab.CreateMergeRequestOptions, options ...gitlab.RequestOptionFunc) (*gitlab.MergeRequest, *gitlab.Response, error) {
	resp, err := f.handleGitlabError()
	if err != nil {
		return nil, nil, err
	}
	return &gitlab.MergeRequest{}, resp, nil
}

func TestCreateMr(t *testing.T) {
	var testCreateMrRequestData = CreateMrRequest{
		Title:        "Some title",
		Description:  "Some description",
		TargetBranch: "main",
		DeleteBranch: false,
		Squash:       false,
	}
	t.Run("Creates an MR", func(t *testing.T) {
		request := makeRequest(t, http.MethodPost, "/create_mr", testCreateMrRequestData)
		svc := mergeRequestCreatorService{testProjectData, fakeMergeCreatorClient{}}
		data := getSuccessData(t, svc, request)
		assert(t, data.Message, "MR 'Some title' created")
		assert(t, data.Status, http.StatusOK)
	})

	t.Run("Disallows non-POST methods", func(t *testing.T) {
		request := makeRequest(t, http.MethodGet, "/create_mr", testCreateMrRequestData)
		svc := mergeRequestCreatorService{testProjectData, fakeMergeCreatorClient{}}
		data := getFailData(t, svc, request)
		checkBadMethod(t, data, http.MethodPost)
	})

	t.Run("Handles errors from Gitlab client", func(t *testing.T) {
		request := makeRequest(t, http.MethodPost, "/create_mr", testCreateMrRequestData)
		svc := mergeRequestCreatorService{testProjectData, fakeMergeCreatorClient{testBase{errFromGitlab: true}}}
		data := getFailData(t, svc, request)
		checkErrorFromGitlab(t, data, "Could not create MR")
	})

	t.Run("Handles non-200s from Gitlab client", func(t *testing.T) {
		request := makeRequest(t, http.MethodPost, "/create_mr", testCreateMrRequestData)
		svc := mergeRequestCreatorService{testProjectData, fakeMergeCreatorClient{testBase{status: http.StatusSeeOther}}}
		data := getFailData(t, svc, request)
		checkNon200(t, data, "Could not create MR", "/create_mr")
	})

	t.Run("Handles missing titles", func(t *testing.T) {
		reqData := testCreateMrRequestData
		reqData.Title = ""
		request := makeRequest(t, http.MethodPost, "/create_mr", reqData)
		svc := mergeRequestCreatorService{testProjectData, fakeMergeCreatorClient{}}
		data := getFailData(t, svc, request)
		assert(t, data.Status, http.StatusBadRequest)
		assert(t, data.Message, "Could not create MR")
		assert(t, data.Details, "Title cannot be empty")
	})

	t.Run("Handles missing target branch", func(t *testing.T) {
		reqData := testCreateMrRequestData
		reqData.TargetBranch = ""
		request := makeRequest(t, http.MethodPost, "/create_mr", reqData)
		svc := mergeRequestCreatorService{testProjectData, fakeMergeCreatorClient{}}
		data := getFailData(t, svc, request)
		assert(t, data.Status, http.StatusBadRequest)
		assert(t, data.Message, "Could not create MR")
		assert(t, data.Details, "Target branch cannot be empty")
	})
}