package gitexplorer

import (
	"testing"
)

func TestValidatePath(t *testing.T) {
	tests := []struct {
		name    string
		path    string
		wantErr error
	}{
		// Valid paths
		{
			name:    "simple file",
			path:    "README.md",
			wantErr: nil,
		},
		{
			name:    "nested file",
			path:    "internal/gitexplorer/types.go",
			wantErr: nil,
		},
		{
			name:    "file with dots",
			path:    "file.test.go",
			wantErr: nil,
		},
		{
			name:    "current dir prefix",
			path:    "./README.md",
			wantErr: nil,
		},
		{
			name:    "deeply nested",
			path:    "a/b/c/d/e/f/g.txt",
			wantErr: nil,
		},

		// Invalid paths
		{
			name:    "empty path",
			path:    "",
			wantErr: ErrEmptyPath,
		},
		{
			name:    "absolute path unix",
			path:    "/etc/passwd",
			wantErr: ErrAbsolutePath,
		},
		{
			name:    "parent dir traversal simple",
			path:    "../secret.txt",
			wantErr: ErrPathTraversal,
		},
		{
			name:    "parent dir traversal nested",
			path:    "foo/../../../etc/passwd",
			wantErr: ErrPathTraversal,
		},
		{
			name:    "parent dir traversal in middle",
			path:    "foo/bar/../../../secret",
			wantErr: ErrPathTraversal,
		},
		{
			name:    "null byte",
			path:    "file\x00.txt",
			wantErr: ErrNullByte,
		},
		{
			name:    "null byte in middle",
			path:    "foo/bar\x00baz/file.txt",
			wantErr: ErrNullByte,
		},
		{
			name:    "double dot only",
			path:    "..",
			wantErr: ErrPathTraversal,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := ValidatePath(tt.path)
			if err != tt.wantErr {
				t.Errorf("ValidatePath(%q) = %v, want %v", tt.path, err, tt.wantErr)
			}
		})
	}
}