package internal

import (
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"testing"

	"github.com/databricks/cli/internal/acc"
	"github.com/databricks/cli/libs/dbr"
	"github.com/databricks/cli/libs/git"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

const examplesRepoUrl = "https://github.com/databricks/bundle-examples"
const examplesRepoProvider = "gitHub"

func assertFullGitInfo(t *testing.T, expectedRoot string, info git.RepositoryInfo) {
	assert.Equal(t, "main", info.CurrentBranch)
	assert.NotEmpty(t, info.LatestCommit)
	assert.Equal(t, examplesRepoUrl, info.OriginURL)
	assert.Equal(t, expectedRoot, info.WorktreeRoot)
}

func assertEmptyGitInfo(t *testing.T, info git.RepositoryInfo) {
	assertSparseGitInfo(t, "", info)
}

func assertSparseGitInfo(t *testing.T, expectedRoot string, info git.RepositoryInfo) {
	assert.Equal(t, "", info.CurrentBranch)
	assert.Equal(t, "", info.LatestCommit)
	assert.Equal(t, "", info.OriginURL)
	assert.Equal(t, expectedRoot, info.WorktreeRoot)
}

func TestAccFetchRepositoryInfoAPI_FromRepo(t *testing.T) {
	ctx, wt := acc.WorkspaceTest(t)
	me, err := wt.W.CurrentUser.Me(ctx)
	require.NoError(t, err)

	targetPath := acc.RandomName(path.Join("/Workspace/Users", me.UserName, "/testing-clone-bundle-examples-"))
	stdout, stderr := RequireSuccessfulRun(t, "repos", "create", examplesRepoUrl, examplesRepoProvider, "--path", targetPath)
	t.Cleanup(func() {
		RequireSuccessfulRun(t, "repos", "delete", targetPath)
	})

	assert.Empty(t, stderr.String())
	assert.NotEmpty(t, stdout.String())
	ctx = dbr.MockRuntime(ctx, true)

	for _, inputPath := range []string{
		path.Join(targetPath, "knowledge_base/dashboard_nyc_taxi"),
		targetPath,
	} {
		t.Run(inputPath, func(t *testing.T) {
			info, err := git.FetchRepositoryInfo(ctx, inputPath, wt.W)
			assert.NoError(t, err)
			assertFullGitInfo(t, targetPath, info)
		})
	}
}

func TestAccFetchRepositoryInfoAPI_FromNonRepo(t *testing.T) {
	ctx, wt := acc.WorkspaceTest(t)
	me, err := wt.W.CurrentUser.Me(ctx)
	require.NoError(t, err)

	rootPath := acc.RandomName(path.Join("/Workspace/Users", me.UserName, "testing-nonrepo-"))
	_, stderr := RequireSuccessfulRun(t, "workspace", "mkdirs", path.Join(rootPath, "a/b/c"))
	t.Cleanup(func() {
		RequireSuccessfulRun(t, "workspace", "delete", "--recursive", rootPath)
	})

	assert.Empty(t, stderr.String())
	ctx = dbr.MockRuntime(ctx, true)

	tests := []struct {
		input string
		msg   string
	}{
		{
			input: path.Join(rootPath, "a/b/c"),
			msg:   "",
		},
		{
			input: rootPath,
			msg:   "",
		},
		{
			input: path.Join(rootPath, "/non-existent"),
			msg:   "doesn't exist",
		},
	}

	for _, test := range tests {
		t.Run(test.input+" <==> "+test.msg, func(t *testing.T) {
			info, err := git.FetchRepositoryInfo(ctx, test.input, wt.W)
			if test.msg == "" {
				assert.NoError(t, err)
			} else {
				assert.Error(t, err)
				assert.Contains(t, err.Error(), test.msg)
			}
			assertEmptyGitInfo(t, info)
		})
	}
}

func TestAccFetchRepositoryInfoDotGit_FromGitRepo(t *testing.T) {
	ctx, wt := acc.WorkspaceTest(t)

	repo := cloneRepoLocally(t, examplesRepoUrl)

	for _, inputPath := range []string{
		filepath.Join(repo, "knowledge_base/dashboard_nyc_taxi"),
		repo,
	} {
		t.Run(inputPath, func(t *testing.T) {
			info, err := git.FetchRepositoryInfo(ctx, inputPath, wt.W)
			assert.NoError(t, err)
			assertFullGitInfo(t, repo, info)
		})
	}
}

func cloneRepoLocally(t *testing.T, repoUrl string) string {
	tempDir := t.TempDir()
	localRoot := filepath.Join(tempDir, "repo")

	cmd := exec.Command("git", "clone", "--depth=1", examplesRepoUrl, localRoot)
	err := cmd.Run()
	require.NoError(t, err)
	return localRoot
}

func TestAccFetchRepositoryInfoDotGit_FromNonGitRepo(t *testing.T) {
	ctx, wt := acc.WorkspaceTest(t)

	tempDir := t.TempDir()
	root := filepath.Join(tempDir, "repo")
	require.NoError(t, os.MkdirAll(filepath.Join(root, "a/b/c"), 0700))

	tests := []string{
		filepath.Join(root, "a/b/c"),
		root,
		filepath.Join(root, "/non-existent"),
	}

	for _, input := range tests {
		t.Run(input, func(t *testing.T) {
			info, err := git.FetchRepositoryInfo(ctx, input, wt.W)
			assert.NoError(t, err)
			assertEmptyGitInfo(t, info)
		})
	}
}

func TestAccFetchRepositoryInfoDotGit_FromBrokenGitRepo(t *testing.T) {
	ctx, wt := acc.WorkspaceTest(t)

	tempDir := t.TempDir()
	root := filepath.Join(tempDir, "repo")
	path := filepath.Join(root, "a/b/c")
	require.NoError(t, os.MkdirAll(path, 0700))
	require.NoError(t, os.WriteFile(filepath.Join(root, ".git"), []byte(""), 0000))

	info, err := git.FetchRepositoryInfo(ctx, path, wt.W)
	assert.NoError(t, err)
	assertSparseGitInfo(t, root, info)
}