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// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package integration

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"testing"

	issues_model "code.gitea.io/gitea/models/issues"
	repo_model "code.gitea.io/gitea/models/repo"
	"code.gitea.io/gitea/models/unittest"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/setting"
	api "code.gitea.io/gitea/modules/structs"
	"code.gitea.io/gitea/services/forms"
	issue_service "code.gitea.io/gitea/services/issue"
	"code.gitea.io/gitea/tests"

	"github.com/stretchr/testify/assert"
)

func TestAPIViewPulls(t *testing.T) {
	defer tests.PrepareTestEnv(t)()
	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})

	ctx := NewAPITestContext(t, "user2", repo.Name)

	req := NewRequestf(t, "GET", "/api/v1/repos/%s/%s/pulls?state=all&token="+ctx.Token, owner.Name, repo.Name)
	resp := ctx.Session.MakeRequest(t, req, http.StatusOK)

	var pulls []*api.PullRequest
	DecodeJSON(t, resp, &pulls)
	expectedLen := unittest.GetCount(t, &issues_model.Issue{RepoID: repo.ID}, unittest.Cond("is_pull = ?", true))
	assert.Len(t, pulls, expectedLen)

	pull := pulls[0]
	if assert.EqualValues(t, 5, pull.ID) {
		resp = ctx.Session.MakeRequest(t, NewRequest(t, "GET", pull.DiffURL), http.StatusOK)
		_, err := ioutil.ReadAll(resp.Body)
		assert.NoError(t, err)
		// TODO: use diff to generate stats to test against

		t.Run(fmt.Sprintf("APIGetPullFiles_%d", pull.ID),
			doAPIGetPullFiles(ctx, pull, func(t *testing.T, files []*api.ChangedFile) {
				if assert.Len(t, files, 1) {
					assert.EqualValues(t, "File-WoW", files[0].Filename)
					assert.EqualValues(t, "", files[0].PreviousFilename)
					assert.EqualValues(t, 1, files[0].Additions)
					assert.EqualValues(t, 1, files[0].Changes)
					assert.EqualValues(t, 0, files[0].Deletions)
					assert.EqualValues(t, "added", files[0].Status)
				}
			}))
	}
}

// TestAPIMergePullWIP ensures that we can't merge a WIP pull request
func TestAPIMergePullWIP(t *testing.T) {
	defer tests.PrepareTestEnv(t)()
	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
	pr := unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{Status: issues_model.PullRequestStatusMergeable}, unittest.Cond("has_merged = ?", false))
	pr.LoadIssue()
	issue_service.ChangeTitle(pr.Issue, owner, setting.Repository.PullRequest.WorkInProgressPrefixes[0]+" "+pr.Issue.Title)

	// force reload
	pr.LoadAttributes()

	assert.Contains(t, pr.Issue.Title, setting.Repository.PullRequest.WorkInProgressPrefixes[0])

	session := loginUser(t, owner.Name)
	token := getTokenForLoggedInUser(t, session)
	req := NewRequestWithJSON(t, http.MethodPost, fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d/merge?token=%s", owner.Name, repo.Name, pr.Index, token), &forms.MergePullRequestForm{
		MergeMessageField: pr.Issue.Title,
		Do:                string(repo_model.MergeStyleMerge),
	})

	session.MakeRequest(t, req, http.StatusMethodNotAllowed)
}

func TestAPICreatePullSuccess(t *testing.T) {
	defer tests.PrepareTestEnv(t)()
	repo10 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 10})
	// repo10 have code, pulls units.
	repo11 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 11})
	// repo11 only have code unit but should still create pulls
	owner10 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo10.OwnerID})
	owner11 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo11.OwnerID})

	session := loginUser(t, owner11.Name)
	token := getTokenForLoggedInUser(t, session)
	req := NewRequestWithJSON(t, http.MethodPost, fmt.Sprintf("/api/v1/repos/%s/%s/pulls?token=%s", owner10.Name, repo10.Name, token), &api.CreatePullRequestOption{
		Head:  fmt.Sprintf("%s:master", owner11.Name),
		Base:  "master",
		Title: "create a failure pr",
	})
	session.MakeRequest(t, req, http.StatusCreated)
	session.MakeRequest(t, req, http.StatusUnprocessableEntity) // second request should fail
}

func TestAPICreatePullWithFieldsSuccess(t *testing.T) {
	defer tests.PrepareTestEnv(t)()
	// repo10 have code, pulls units.
	repo10 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 10})
	owner10 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo10.OwnerID})
	// repo11 only have code unit but should still create pulls
	repo11 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 11})
	owner11 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo11.OwnerID})

	session := loginUser(t, owner11.Name)
	token := getTokenForLoggedInUser(t, session)

	opts := &api.CreatePullRequestOption{
		Head:      fmt.Sprintf("%s:master", owner11.Name),
		Base:      "master",
		Title:     "create a failure pr",
		Body:      "foobaaar",
		Milestone: 5,
		Assignees: []string{owner10.Name},
		Labels:    []int64{5},
	}

	req := NewRequestWithJSON(t, http.MethodPost, fmt.Sprintf("/api/v1/repos/%s/%s/pulls?token=%s", owner10.Name, repo10.Name, token), opts)

	res := session.MakeRequest(t, req, http.StatusCreated)
	pull := new(api.PullRequest)
	DecodeJSON(t, res, pull)

	assert.NotNil(t, pull.Milestone)
	assert.EqualValues(t, opts.Milestone, pull.Milestone.ID)
	if assert.Len(t, pull.Assignees, 1) {
		assert.EqualValues(t, opts.Assignees[0], owner10.Name)
	}
	assert.NotNil(t, pull.Labels)
	assert.EqualValues(t, opts.Labels[0], pull.Labels[0].ID)
}

func TestAPICreatePullWithFieldsFailure(t *testing.T) {
	defer tests.PrepareTestEnv(t)()
	// repo10 have code, pulls units.
	repo10 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 10})
	owner10 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo10.OwnerID})
	// repo11 only have code unit but should still create pulls
	repo11 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 11})
	owner11 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo11.OwnerID})

	session := loginUser(t, owner11.Name)
	token := getTokenForLoggedInUser(t, session)

	opts := &api.CreatePullRequestOption{
		Head: fmt.Sprintf("%s:master", owner11.Name),
		Base: "master",
	}

	req := NewRequestWithJSON(t, http.MethodPost, fmt.Sprintf("/api/v1/repos/%s/%s/pulls?token=%s", owner10.Name, repo10.Name, token), opts)
	session.MakeRequest(t, req, http.StatusUnprocessableEntity)
	opts.Title = "is required"

	opts.Milestone = 666
	session.MakeRequest(t, req, http.StatusUnprocessableEntity)
	opts.Milestone = 5

	opts.Assignees = []string{"qweruqweroiuyqweoiruywqer"}
	session.MakeRequest(t, req, http.StatusUnprocessableEntity)
	opts.Assignees = []string{owner10.LoginName}

	opts.Labels = []int64{55555}
	session.MakeRequest(t, req, http.StatusUnprocessableEntity)
	opts.Labels = []int64{5}
}

func TestAPIEditPull(t *testing.T) {
	defer tests.PrepareTestEnv(t)()
	repo10 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 10})
	owner10 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo10.OwnerID})

	session := loginUser(t, owner10.Name)
	token := getTokenForLoggedInUser(t, session)
	req := NewRequestWithJSON(t, http.MethodPost, fmt.Sprintf("/api/v1/repos/%s/%s/pulls?token=%s", owner10.Name, repo10.Name, token), &api.CreatePullRequestOption{
		Head:  "develop",
		Base:  "master",
		Title: "create a success pr",
	})
	pull := new(api.PullRequest)
	resp := session.MakeRequest(t, req, http.StatusCreated)
	DecodeJSON(t, resp, pull)
	assert.EqualValues(t, "master", pull.Base.Name)

	req = NewRequestWithJSON(t, http.MethodPatch, fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d?token=%s", owner10.Name, repo10.Name, pull.Index, token), &api.EditPullRequestOption{
		Base:  "feature/1",
		Title: "edit a this pr",
	})
	resp = session.MakeRequest(t, req, http.StatusCreated)
	DecodeJSON(t, resp, pull)
	assert.EqualValues(t, "feature/1", pull.Base.Name)

	req = NewRequestWithJSON(t, http.MethodPatch, fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d?token=%s", owner10.Name, repo10.Name, pull.Index, token), &api.EditPullRequestOption{
		Base: "not-exist",
	})
	session.MakeRequest(t, req, http.StatusNotFound)
}

func doAPIGetPullFiles(ctx APITestContext, pr *api.PullRequest, callback func(*testing.T, []*api.ChangedFile)) func(*testing.T) {
	return func(t *testing.T) {
		url := fmt.Sprintf("/api/v1/repos/%s/%s/pulls/%d/files?token=%s", ctx.Username, ctx.Reponame, pr.Index, ctx.Token)

		req := NewRequest(t, http.MethodGet, url)
		if ctx.ExpectedCode == 0 {
			ctx.ExpectedCode = http.StatusOK
		}
		resp := ctx.Session.MakeRequest(t, req, ctx.ExpectedCode)

		files := make([]*api.ChangedFile, 0, 1)
		DecodeJSON(t, resp, &files)

		if callback != nil {
			callback(t, files)
		}
	}
}