// Copyright 2025 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package gitrepo

import (
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestParseCommitFileStatus(t *testing.T) {
	type testcase struct {
		output   string
		added    []string
		removed  []string
		modified []string
	}

	kases := []testcase{
		{
			// Merge commit
			output: "MM\x00options/locale/locale_en-US.ini\x00",
			modified: []string{
				"options/locale/locale_en-US.ini",
			},
			added:   []string{},
			removed: []string{},
		},
		{
			// Spaces commit
			output: "D\x00b\x00D\x00b b/b\x00A\x00b b/b b/b b/b\x00A\x00b b/b b/b b/b b/b\x00",
			removed: []string{
				"b",
				"b b/b",
			},
			modified: []string{},
			added: []string{
				"b b/b b/b b/b",
				"b b/b b/b b/b b/b",
			},
		},
		{
			// larger commit
			output: "M\x00go.mod\x00M\x00go.sum\x00M\x00modules/ssh/ssh.go\x00M\x00vendor/github.com/gliderlabs/ssh/circle.yml\x00M\x00vendor/github.com/gliderlabs/ssh/context.go\x00A\x00vendor/github.com/gliderlabs/ssh/go.mod\x00A\x00vendor/github.com/gliderlabs/ssh/go.sum\x00M\x00vendor/github.com/gliderlabs/ssh/server.go\x00M\x00vendor/github.com/gliderlabs/ssh/session.go\x00M\x00vendor/github.com/gliderlabs/ssh/ssh.go\x00M\x00vendor/golang.org/x/sys/unix/mkerrors.sh\x00M\x00vendor/golang.org/x/sys/unix/syscall_darwin.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_darwin_amd64.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_darwin_arm64.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_freebsd_386.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_freebsd_amd64.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_freebsd_arm.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_freebsd_arm64.go\x00M\x00vendor/golang.org/x/sys/unix/zerrors_linux.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_darwin_amd64.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_darwin_arm64.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_dragonfly_amd64.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_freebsd_386.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_freebsd_amd64.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_freebsd_arm.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_freebsd_arm64.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_netbsd_386.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_netbsd_amd64.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_netbsd_arm.go\x00M\x00vendor/golang.org/x/sys/unix/ztypes_netbsd_arm64.go\x00M\x00vendor/modules.txt\x00",
			modified: []string{
				"go.mod",
				"go.sum",
				"modules/ssh/ssh.go",
				"vendor/github.com/gliderlabs/ssh/circle.yml",
				"vendor/github.com/gliderlabs/ssh/context.go",
				"vendor/github.com/gliderlabs/ssh/server.go",
				"vendor/github.com/gliderlabs/ssh/session.go",
				"vendor/github.com/gliderlabs/ssh/ssh.go",
				"vendor/golang.org/x/sys/unix/mkerrors.sh",
				"vendor/golang.org/x/sys/unix/syscall_darwin.go",
				"vendor/golang.org/x/sys/unix/zerrors_darwin_amd64.go",
				"vendor/golang.org/x/sys/unix/zerrors_darwin_arm64.go",
				"vendor/golang.org/x/sys/unix/zerrors_freebsd_386.go",
				"vendor/golang.org/x/sys/unix/zerrors_freebsd_amd64.go",
				"vendor/golang.org/x/sys/unix/zerrors_freebsd_arm.go",
				"vendor/golang.org/x/sys/unix/zerrors_freebsd_arm64.go",
				"vendor/golang.org/x/sys/unix/zerrors_linux.go",
				"vendor/golang.org/x/sys/unix/ztypes_darwin_amd64.go",
				"vendor/golang.org/x/sys/unix/ztypes_darwin_arm64.go",
				"vendor/golang.org/x/sys/unix/ztypes_dragonfly_amd64.go",
				"vendor/golang.org/x/sys/unix/ztypes_freebsd_386.go",
				"vendor/golang.org/x/sys/unix/ztypes_freebsd_amd64.go",
				"vendor/golang.org/x/sys/unix/ztypes_freebsd_arm.go",
				"vendor/golang.org/x/sys/unix/ztypes_freebsd_arm64.go",
				"vendor/golang.org/x/sys/unix/ztypes_netbsd_386.go",
				"vendor/golang.org/x/sys/unix/ztypes_netbsd_amd64.go",
				"vendor/golang.org/x/sys/unix/ztypes_netbsd_arm.go",
				"vendor/golang.org/x/sys/unix/ztypes_netbsd_arm64.go",
				"vendor/modules.txt",
			},
			added: []string{
				"vendor/github.com/gliderlabs/ssh/go.mod",
				"vendor/github.com/gliderlabs/ssh/go.sum",
			},
			removed: []string{},
		},
		{
			// git 1.7.2 adds an unnecessary \x00 on merge commit
			output: "\x00MM\x00options/locale/locale_en-US.ini\x00",
			modified: []string{
				"options/locale/locale_en-US.ini",
			},
			added:   []string{},
			removed: []string{},
		},
		{
			// git 1.7.2 adds an unnecessary \n on normal commit
			output: "\nD\x00b\x00D\x00b b/b\x00A\x00b b/b b/b b/b\x00A\x00b b/b b/b b/b b/b\x00",
			removed: []string{
				"b",
				"b b/b",
			},
			modified: []string{},
			added: []string{
				"b b/b b/b b/b",
				"b b/b b/b b/b b/b",
			},
		},
	}

	for _, kase := range kases {
		fileStatus := NewCommitFileStatus()
		parseCommitFileStatus(fileStatus, strings.NewReader(kase.output))

		assert.Equal(t, kase.added, fileStatus.Added)
		assert.Equal(t, kase.removed, fileStatus.Removed)
		assert.Equal(t, kase.modified, fileStatus.Modified)
	}
}

func TestGetCommitFileStatusMerges(t *testing.T) {
	bareRepo6 := &mockRepository{path: "repo6_merge"}

	commitFileStatus, err := GetCommitFileStatus(t.Context(), bareRepo6, "022f4ce6214973e018f02bf363bf8a2e3691f699")
	assert.NoError(t, err)

	expected := CommitFileStatus{
		[]string{
			"add_file.txt",
		},
		[]string{
			"to_remove.txt",
		},
		[]string{
			"to_modify.txt",
		},
	}

	assert.Equal(t, expected.Added, commitFileStatus.Added)
	assert.Equal(t, expected.Removed, commitFileStatus.Removed)
	assert.Equal(t, expected.Modified, commitFileStatus.Modified)
}

func TestGetCommitFileStatusMergesSha256(t *testing.T) {
	bareRepo6Sha256 := &mockRepository{path: "repo6_merge_sha256"}

	commitFileStatus, err := GetCommitFileStatus(t.Context(), bareRepo6Sha256, "d2e5609f630dd8db500f5298d05d16def282412e3e66ed68cc7d0833b29129a1")
	assert.NoError(t, err)

	expected := CommitFileStatus{
		[]string{
			"add_file.txt",
		},
		[]string{},
		[]string{
			"to_modify.txt",
		},
	}

	assert.Equal(t, expected.Added, commitFileStatus.Added)
	assert.Equal(t, expected.Removed, commitFileStatus.Removed)
	assert.Equal(t, expected.Modified, commitFileStatus.Modified)

	expected = CommitFileStatus{
		[]string{},
		[]string{
			"to_remove.txt",
		},
		[]string{},
	}

	commitFileStatus, err = GetCommitFileStatus(t.Context(), bareRepo6Sha256, "da1ded40dc8e5b7c564171f4bf2fc8370487decfb1cb6a99ef28f3ed73d09172")
	assert.NoError(t, err)

	assert.Equal(t, expected.Added, commitFileStatus.Added)
	assert.Equal(t, expected.Removed, commitFileStatus.Removed)
	assert.Equal(t, expected.Modified, commitFileStatus.Modified)
}