package list

import (
	"bytes"
	"io/ioutil"
	"net/http"
	"strings"
	"testing"

	"github.com/MakeNowJust/heredoc"
	"github.com/cli/cli/internal/ghrepo"
	"github.com/cli/cli/internal/run"
	"github.com/cli/cli/pkg/cmdutil"
	"github.com/cli/cli/pkg/httpmock"
	"github.com/cli/cli/pkg/iostreams"
	"github.com/cli/cli/test"
	"github.com/google/shlex"
	"github.com/stretchr/testify/assert"
)

func runCommand(rt http.RoundTripper, isTTY bool, cli string) (*test.CmdOut, error) {
	io, _, stdout, stderr := iostreams.Test()
	io.SetStdoutTTY(isTTY)
	io.SetStdinTTY(isTTY)
	io.SetStderrTTY(isTTY)

	browser := &cmdutil.TestBrowser{}
	factory := &cmdutil.Factory{
		IOStreams: io,
		Browser:   browser,
		HttpClient: func() (*http.Client, error) {
			return &http.Client{Transport: rt}, nil
		},
		BaseRepo: func() (ghrepo.Interface, error) {
			return ghrepo.New("OWNER", "REPO"), nil
		},
	}

	cmd := NewCmdList(factory, nil)

	argv, err := shlex.Split(cli)
	if err != nil {
		return nil, err
	}
	cmd.SetArgs(argv)

	cmd.SetIn(&bytes.Buffer{})
	cmd.SetOut(ioutil.Discard)
	cmd.SetErr(ioutil.Discard)

	_, err = cmd.ExecuteC()
	return &test.CmdOut{
		OutBuf:     stdout,
		ErrBuf:     stderr,
		BrowsedURL: browser.BrowsedURL(),
	}, err
}

func initFakeHTTP() *httpmock.Registry {
	return &httpmock.Registry{}
}

func TestPRList(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	http.Register(httpmock.GraphQL(`query PullRequestList\b`), httpmock.FileResponse("./fixtures/prList.json"))

	output, err := runCommand(http, true, "")
	if err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, heredoc.Doc(`

		Showing 3 of 3 open pull requests in OWNER/REPO

		#32  New feature            feature
		#29  Fixed bad bug          hubot:bug-fix
		#28  Improve documentation  docs
	`), output.String())
	assert.Equal(t, ``, output.Stderr())
}

func TestPRList_nontty(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	http.Register(httpmock.GraphQL(`query PullRequestList\b`), httpmock.FileResponse("./fixtures/prList.json"))

	output, err := runCommand(http, false, "")
	if err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, "", output.Stderr())

	assert.Equal(t, `32	New feature	feature	DRAFT
29	Fixed bad bug	hubot:bug-fix	OPEN
28	Improve documentation	docs	MERGED
`, output.String())
}

func TestPRList_filtering(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	http.Register(
		httpmock.GraphQL(`query PullRequestList\b`),
		httpmock.GraphQLQuery(`{}`, func(_ string, params map[string]interface{}) {
			assert.Equal(t, []interface{}{"OPEN", "CLOSED", "MERGED"}, params["state"].([]interface{}))
		}))

	output, err := runCommand(http, true, `-s all`)
	if err != nil {
		t.Fatal(err)
	}

	assert.Equal(t, "", output.Stderr())
	assert.Equal(t, `
No pull requests match your search in OWNER/REPO

`, output.String())
}

func TestPRList_filteringRemoveDuplicate(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	http.Register(
		httpmock.GraphQL(`query PullRequestList\b`),
		httpmock.FileResponse("./fixtures/prListWithDuplicates.json"))

	output, err := runCommand(http, true, "")
	if err != nil {
		t.Fatal(err)
	}

	out := output.String()
	idx := strings.Index(out, "New feature")
	if idx < 0 {
		t.Fatalf("text %q not found in %q", "New feature", out)
	}
	assert.Equal(t, idx, strings.LastIndex(out, "New feature"))
}

func TestPRList_filteringClosed(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	http.Register(
		httpmock.GraphQL(`query PullRequestList\b`),
		httpmock.GraphQLQuery(`{}`, func(_ string, params map[string]interface{}) {
			assert.Equal(t, []interface{}{"CLOSED", "MERGED"}, params["state"].([]interface{}))
		}))

	_, err := runCommand(http, true, `-s closed`)
	if err != nil {
		t.Fatal(err)
	}
}

func TestPRList_filteringAssignee(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	http.Register(
		httpmock.GraphQL(`query PullRequestSearch\b`),
		httpmock.GraphQLQuery(`{}`, func(_ string, params map[string]interface{}) {
			assert.Equal(t, `repo:OWNER/REPO is:pr is:merged assignee:hubot label:"needs tests" base:develop`, params["q"].(string))
		}))

	_, err := runCommand(http, true, `-s merged -l "needs tests" -a hubot -B develop`)
	if err != nil {
		t.Fatal(err)
	}
}

func TestPRList_filteringAssigneeLabels(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	_, err := runCommand(http, true, `-l one,two -a hubot`)
	if err == nil && err.Error() != "multiple labels with --assignee are not supported" {
		t.Fatal(err)
	}
}

func TestPRList_withInvalidLimitFlag(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	_, err := runCommand(http, true, `--limit=0`)
	if err == nil && err.Error() != "invalid limit: 0" {
		t.Errorf("error running command `issue list`: %v", err)
	}
}

func TestPRList_web(t *testing.T) {
	http := initFakeHTTP()
	defer http.Verify(t)

	_, cmdTeardown := run.Stub()
	defer cmdTeardown(t)

	output, err := runCommand(http, true, "--web -a peter -l bug -l docs -L 10 -s merged -B trunk")
	if err != nil {
		t.Errorf("error running command `pr list` with `--web` flag: %v", err)
	}

	assert.Equal(t, "", output.String())
	assert.Equal(t, "Opening github.com/OWNER/REPO/pulls in your browser.\n", output.Stderr())
	assert.Equal(t, "https://github.com/OWNER/REPO/pulls?q=is%3Apr+is%3Amerged+assignee%3Apeter+label%3Abug+label%3Adocs+base%3Atrunk", output.BrowsedURL)
}