package shared

import (
	"errors"
	"net/http"
	"net/url"
	"testing"

	"github.com/cli/cli/context"
	"github.com/cli/cli/git"
	"github.com/cli/cli/internal/ghrepo"
	"github.com/cli/cli/pkg/httpmock"
)

func TestFind(t *testing.T) {
	type args struct {
		baseRepoFn   func() (ghrepo.Interface, error)
		branchFn     func() (string, error)
		branchConfig func(string) git.BranchConfig
		remotesFn    func() (context.Remotes, error)
		selector     string
		fields       []string
		baseBranch   string
	}
	tests := []struct {
		name     string
		args     args
		httpStub func(*httpmock.Registry)
		wantPR   int
		wantRepo string
		wantErr  bool
	}{
		{
			name: "number argument",
			args: args{
				selector: "13",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestByNumber\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequest":{"number":13}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "baseRepo is error",
			args: args{
				selector: "13",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return nil, errors.New("baseRepoErr")
				},
			},
			wantErr: true,
		},
		{
			name: "blank fields is error",
			args: args{
				selector: "13",
				fields:   []string{},
			},
			wantErr: true,
		},
		{
			name: "number only",
			args: args{
				selector: "13",
				fields:   []string{"number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
			},
			httpStub: nil,
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "number with hash argument",
			args: args{
				selector: "#13",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestByNumber\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequest":{"number":13}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "URL argument",
			args: args{
				selector:   "https://example.org/OWNER/REPO/pull/13/files",
				fields:     []string{"id", "number"},
				baseRepoFn: nil,
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestByNumber\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequest":{"number":13}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://example.org/OWNER/REPO",
		},
		{
			name: "branch argument",
			args: args{
				selector: "blueberries",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestForBranch\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequests":{"nodes":[
							{
								"number": 14,
								"state": "CLOSED",
								"baseRefName": "main",
								"headRefName": "blueberries",
								"isCrossRepository": false,
								"headRepositoryOwner": {"login":"OWNER"}
							},
							{
								"number": 13,
								"state": "OPEN",
								"baseRefName": "main",
								"headRefName": "blueberries",
								"isCrossRepository": false,
								"headRepositoryOwner": {"login":"OWNER"}
							}
						]}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "branch argument with base branch",
			args: args{
				selector:   "blueberries",
				baseBranch: "main",
				fields:     []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestForBranch\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequests":{"nodes":[
							{
								"number": 14,
								"state": "OPEN",
								"baseRefName": "dev",
								"headRefName": "blueberries",
								"isCrossRepository": false,
								"headRepositoryOwner": {"login":"OWNER"}
							},
							{
								"number": 13,
								"state": "OPEN",
								"baseRefName": "main",
								"headRefName": "blueberries",
								"isCrossRepository": false,
								"headRepositoryOwner": {"login":"OWNER"}
							}
						]}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "no argument reads current branch",
			args: args{
				selector: "",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
				branchFn: func() (string, error) {
					return "blueberries", nil
				},
				branchConfig: func(branch string) (c git.BranchConfig) {
					return
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestForBranch\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequests":{"nodes":[
							{
								"number": 13,
								"state": "OPEN",
								"baseRefName": "main",
								"headRefName": "blueberries",
								"isCrossRepository": false,
								"headRepositoryOwner": {"login":"OWNER"}
							}
						]}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "current branch is error",
			args: args{
				selector: "",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
				branchFn: func() (string, error) {
					return "", errors.New("branchErr")
				},
			},
			wantErr: true,
		},
		{
			name: "current branch with upstream configuration",
			args: args{
				selector: "",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
				branchFn: func() (string, error) {
					return "blueberries", nil
				},
				branchConfig: func(branch string) (c git.BranchConfig) {
					c.MergeRef = "refs/heads/blue-upstream-berries"
					c.RemoteName = "origin"
					return
				},
				remotesFn: func() (context.Remotes, error) {
					return context.Remotes{{
						Remote: &git.Remote{Name: "origin"},
						Repo:   ghrepo.New("UPSTREAMOWNER", "REPO"),
					}}, nil
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestForBranch\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequests":{"nodes":[
							{
								"number": 13,
								"state": "OPEN",
								"baseRefName": "main",
								"headRefName": "blue-upstream-berries",
								"isCrossRepository": true,
								"headRepositoryOwner": {"login":"UPSTREAMOWNER"}
							}
						]}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "current branch with upstream configuration",
			args: args{
				selector: "",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
				branchFn: func() (string, error) {
					return "blueberries", nil
				},
				branchConfig: func(branch string) (c git.BranchConfig) {
					u, _ := url.Parse("https://github.com/UPSTREAMOWNER/REPO")
					c.MergeRef = "refs/heads/blue-upstream-berries"
					c.RemoteURL = u
					return
				},
				remotesFn: nil,
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestForBranch\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequests":{"nodes":[
							{
								"number": 13,
								"state": "OPEN",
								"baseRefName": "main",
								"headRefName": "blue-upstream-berries",
								"isCrossRepository": true,
								"headRepositoryOwner": {"login":"UPSTREAMOWNER"}
							}
						]}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
		{
			name: "current branch made by pr checkout",
			args: args{
				selector: "",
				fields:   []string{"id", "number"},
				baseRepoFn: func() (ghrepo.Interface, error) {
					return ghrepo.FromFullName("OWNER/REPO")
				},
				branchFn: func() (string, error) {
					return "blueberries", nil
				},
				branchConfig: func(branch string) (c git.BranchConfig) {
					c.MergeRef = "refs/pull/13/head"
					return
				},
			},
			httpStub: func(r *httpmock.Registry) {
				r.Register(
					httpmock.GraphQL(`query PullRequestByNumber\b`),
					httpmock.StringResponse(`{"data":{"repository":{
						"pullRequest":{"number":13}
					}}}`))
			},
			wantPR:   13,
			wantRepo: "https://github.com/OWNER/REPO",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			reg := &httpmock.Registry{}
			defer reg.Verify(t)
			if tt.httpStub != nil {
				tt.httpStub(reg)
			}

			f := finder{
				httpClient: func() (*http.Client, error) {
					return &http.Client{Transport: reg}, nil
				},
				baseRepoFn:   tt.args.baseRepoFn,
				branchFn:     tt.args.branchFn,
				branchConfig: tt.args.branchConfig,
				remotesFn:    tt.args.remotesFn,
			}

			pr, repo, err := f.Find(FindOptions{
				Selector:   tt.args.selector,
				Fields:     tt.args.fields,
				BaseBranch: tt.args.baseBranch,
			})
			if (err != nil) != tt.wantErr {
				t.Errorf("Find() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if tt.wantErr {
				if tt.wantPR > 0 {
					t.Error("wantPR field is not checked in error case")
				}
				if tt.wantRepo != "" {
					t.Error("wantRepo field is not checked in error case")
				}
				return
			}

			if pr.Number != tt.wantPR {
				t.Errorf("want pr #%d, got #%d", tt.wantPR, pr.Number)
			}
			repoURL := ghrepo.GenerateRepoURL(repo, "")
			if repoURL != tt.wantRepo {
				t.Errorf("want repo %s, got %s", tt.wantRepo, repoURL)
			}
		})
	}
}