package gitinfo

import (
	"errors"
	"runtime/debug"
	"testing"
	"time"

	"github.com/matryer/is"
)

func TestReadGitInfo(t *testing.T) {
	assert := is.New(t)

	readBuildInfo = func() (*debug.BuildInfo, bool) {
		return &debug.BuildInfo{
			Settings: []debug.BuildSetting{
				{Key: "vcs", Value: "git"},
				{Key: "vcs.revision", Value: "ad1aef070cf1fd5f2f16701f84703ff1e1dd6738"},
				{Key: "vcs.time", Value: "2022-03-22T19:56:47Z"},
				{Key: "vcs.modified", Value: "true"},
			},
		}, true
	}

	expected := &GitInfo{
		Revision: "ad1aef070cf1fd5f2f16701f84703ff1e1dd6738",
		Time:     time.Date(2022, 3, 22, 19, 56, 47, 0, time.UTC),
		Modified: true,
	}

	info, err := ReadGitInfo()
	assert.NoErr(err)            // Should read build info
	assert.Equal(info, expected) // GitInfo should match expected
}

func TestNoBuildInfo(t *testing.T) {
	assert := is.New(t)

	readBuildInfo = func() (*debug.BuildInfo, bool) {
		return nil, false
	}

	_, err := ReadGitInfo()
	assert.True(errors.Is(err, ErrNoBuildInfo)) // Should not read build info
}

func TestNoGit(t *testing.T) {
	assert := is.New(t)

	readBuildInfo = func() (*debug.BuildInfo, bool) {
		return &debug.BuildInfo{
			Settings: []debug.BuildSetting{
				{Key: "vcs", Value: "svn"},
			},
		}, true
	}

	_, err := ReadGitInfo()
	assert.True(errors.Is(err, ErrNoGit)) // Should not have git info

	readBuildInfo = func() (*debug.BuildInfo, bool) {
		return &debug.BuildInfo{}, true
	}

	_, err = ReadGitInfo()
	assert.True(errors.Is(err, ErrNoGit)) // Should not have git info
}

func TestMustReadGitInfo(t *testing.T) {
	assert := is.New(t)

	readBuildInfo = func() (*debug.BuildInfo, bool) {
		return nil, false
	}

	info := MustReadGitInfo()
	assert.Equal(info.Revision, "develop") // revision should be "develop"
}