package git_commands

import (
	"regexp"
	"strconv"
	"testing"

	"github.com/go-errors/errors"
	"github.com/jesseduffield/lazygit/pkg/app/daemon"
	"github.com/jesseduffield/lazygit/pkg/commands/git_config"
	"github.com/jesseduffield/lazygit/pkg/commands/models"
	"github.com/jesseduffield/lazygit/pkg/commands/oscommands"
	"github.com/samber/lo"
	"github.com/stretchr/testify/assert"
)

func TestRebaseRebaseBranch(t *testing.T) {
	type scenario struct {
		testName string
		arg      string
		runner   *oscommands.FakeCmdObjRunner
		test     func(error)
	}

	scenarios := []scenario{
		{
			testName: "successful rebase",
			arg:      "master",
			runner: oscommands.NewFakeRunner(t).
				Expect(`git rebase --interactive --autostash --keep-empty --empty=keep --no-autosquash master`, "", nil),
			test: func(err error) {
				assert.NoError(t, err)
			},
		},
		{
			testName: "unsuccessful rebase",
			arg:      "master",
			runner: oscommands.NewFakeRunner(t).
				Expect(`git rebase --interactive --autostash --keep-empty --empty=keep --no-autosquash master`, "", errors.New("error")),
			test: func(err error) {
				assert.Error(t, err)
			},
		},
	}

	for _, s := range scenarios {
		s := s
		t.Run(s.testName, func(t *testing.T) {
			instance := buildRebaseCommands(commonDeps{runner: s.runner})
			s.test(instance.RebaseBranch(s.arg))
		})
	}
}

// TestRebaseSkipEditorCommand confirms that SkipEditorCommand injects
// environment variables that suppress an interactive editor
func TestRebaseSkipEditorCommand(t *testing.T) {
	commandStr := "git blah"
	runner := oscommands.NewFakeRunner(t).ExpectFunc(func(cmdObj oscommands.ICmdObj) (string, error) {
		assert.Equal(t, commandStr, cmdObj.ToString())
		envVars := cmdObj.GetEnvVars()
		for _, regexStr := range []string{
			`^VISUAL=.*$`,
			`^EDITOR=.*$`,
			`^GIT_EDITOR=.*$`,
			`^GIT_SEQUENCE_EDITOR=.*$`,
			"^" + daemon.DaemonKindEnvKey + "=" + strconv.Itoa(int(daemon.DaemonKindExitImmediately)) + "$",
		} {
			regexStr := regexStr
			foundMatch := lo.ContainsBy(envVars, func(envVar string) bool {
				return regexp.MustCompile(regexStr).MatchString(envVar)
			})
			if !foundMatch {
				t.Errorf("expected environment variable %s to be set", regexStr)
			}
		}
		return "", nil
	})
	instance := buildRebaseCommands(commonDeps{runner: runner})
	err := instance.runSkipEditorCommand(instance.cmd.New(commandStr))
	assert.NoError(t, err)
	runner.CheckForMissingCalls()
}

func TestRebaseDiscardOldFileChanges(t *testing.T) {
	type scenario struct {
		testName               string
		gitConfigMockResponses map[string]string
		commits                []*models.Commit
		commitIndex            int
		fileName               string
		runner                 *oscommands.FakeCmdObjRunner
		test                   func(error)
	}

	scenarios := []scenario{
		{
			testName:               "returns error when index outside of range of commits",
			gitConfigMockResponses: nil,
			commits:                []*models.Commit{},
			commitIndex:            0,
			fileName:               "test999.txt",
			runner:                 oscommands.NewFakeRunner(t),
			test: func(err error) {
				assert.Error(t, err)
			},
		},
		{
			testName:               "returns error when using gpg",
			gitConfigMockResponses: map[string]string{"commit.gpgsign": "true"},
			commits:                []*models.Commit{{Name: "commit", Sha: "123456"}},
			commitIndex:            0,
			fileName:               "test999.txt",
			runner:                 oscommands.NewFakeRunner(t),
			test: func(err error) {
				assert.Error(t, err)
			},
		},
		{
			testName:               "checks out file if it already existed",
			gitConfigMockResponses: nil,
			commits: []*models.Commit{
				{Name: "commit", Sha: "123456"},
				{Name: "commit2", Sha: "abcdef"},
			},
			commitIndex: 0,
			fileName:    "test999.txt",
			runner: oscommands.NewFakeRunner(t).
				Expect(`git rebase --interactive --autostash --keep-empty --empty=keep --no-autosquash abcdef`, "", nil).
				Expect(`git cat-file -e HEAD^:"test999.txt"`, "", nil).
				Expect(`git checkout HEAD^ -- "test999.txt"`, "", nil).
				Expect(`git commit --amend --no-edit --allow-empty`, "", nil).
				Expect(`git rebase --continue`, "", nil),
			test: func(err error) {
				assert.NoError(t, err)
			},
		},
		// test for when the file was created within the commit requires a refactor to support proper mocks
		// currently we'd need to mock out the os.Remove function and that's gonna introduce tech debt
	}

	for _, s := range scenarios {
		s := s
		t.Run(s.testName, func(t *testing.T) {
			instance := buildRebaseCommands(commonDeps{
				runner:    s.runner,
				gitConfig: git_config.NewFakeGitConfig(s.gitConfigMockResponses),
			})

			s.test(instance.DiscardOldFileChanges(s.commits, s.commitIndex, s.fileName))
			s.runner.CheckForMissingCalls()
		})
	}
}