package seccomp_test

import (
	"crypto/sha512"
	"errors"
	"io"
	"slices"
	"syscall"
	"testing"

	"git.gensokyo.uk/security/fortify/helper/seccomp"
	"git.gensokyo.uk/security/fortify/internal/fmsg"
)

func TestExport(t *testing.T) {
	testCases := []struct {
		name    string
		opts    seccomp.SyscallOpts
		want    []byte
		wantErr bool
	}{
		{"compat", 0, []byte{
			0x95, 0xec, 0x69, 0xd0, 0x17, 0x73, 0x3e, 0x07,
			0x21, 0x60, 0xe0, 0xda, 0x80, 0xfd, 0xeb, 0xec,
			0xdf, 0x27, 0xae, 0x81, 0x66, 0xf5, 0xe2, 0xa7,
			0x31, 0x27, 0x0c, 0x98, 0xea, 0x2d, 0x29, 0x46,
			0xcb, 0x52, 0x31, 0x02, 0x90, 0x63, 0x66, 0x8a,
			0xf2, 0x15, 0x87, 0x91, 0x55, 0xda, 0x21, 0xac,
			0xa7, 0x9b, 0x07, 0x0e, 0x04, 0xc0, 0xee, 0x9a,
			0xcd, 0xf5, 0x8f, 0x55, 0xcf, 0xa8, 0x15, 0xa5,
		}, false},
		{"base", seccomp.FlagExt, []byte{
			0xdc, 0x7f, 0x2e, 0x1c, 0x5e, 0x82, 0x9b, 0x79,
			0xeb, 0xb7, 0xef, 0xc7, 0x59, 0x15, 0x0f, 0x54,
			0xa8, 0x3a, 0x75, 0xc8, 0xdf, 0x6f, 0xee, 0x4d,
			0xce, 0x5d, 0xad, 0xc4, 0x73, 0x6c, 0x58, 0x5d,
			0x4d, 0xee, 0xbf, 0xeb, 0x3c, 0x79, 0x69, 0xaf,
			0x3a, 0x07, 0x7e, 0x90, 0xb7, 0x7b, 0xb4, 0x74,
			0x1d, 0xb0, 0x5d, 0x90, 0x99, 0x7c, 0x86, 0x59,
			0xb9, 0x58, 0x91, 0x20, 0x6a, 0xc9, 0x95, 0x2d,
		}, false},
		{"everything", seccomp.FlagExt |
			seccomp.FlagDenyNS | seccomp.FlagDenyTTY | seccomp.FlagDenyDevel |
			seccomp.FlagMultiarch | seccomp.FlagLinux32 | seccomp.FlagCan |
			seccomp.FlagBluetooth, []byte{
			0xe9, 0x9d, 0xd3, 0x45, 0xe1, 0x95, 0x41, 0x34,
			0x73, 0xd3, 0xcb, 0xee, 0x07, 0xb4, 0xed, 0x57,
			0xb9, 0x08, 0xbf, 0xa8, 0x9e, 0xa2, 0x07, 0x2f,
			0xe9, 0x34, 0x82, 0x84, 0x7f, 0x50, 0xb5, 0xb7,
			0x58, 0xda, 0x17, 0xe7, 0x4c, 0xa2, 0xbb, 0xc0,
			0x08, 0x13, 0xde, 0x49, 0xa2, 0xb9, 0xbf, 0x83,
			0x4c, 0x02, 0x4e, 0xd4, 0x88, 0x50, 0xbe, 0x69,
			0xb6, 0x8a, 0x9a, 0x4c, 0x5f, 0x53, 0xa9, 0xdb,
		}, false},
		{"strict", seccomp.FlagExt |
			seccomp.FlagDenyNS | seccomp.FlagDenyTTY | seccomp.FlagDenyDevel, []byte{
			0xe8, 0x80, 0x29, 0x8d, 0xf2, 0xbd, 0x67, 0x51,
			0xd0, 0x04, 0x0f, 0xc2, 0x1b, 0xc0, 0xed, 0x4c,
			0x00, 0xf9, 0x5d, 0xc0, 0xd7, 0xba, 0x50, 0x6c,
			0x24, 0x4d, 0x8b, 0x8c, 0xf6, 0x86, 0x6d, 0xba,
			0x8e, 0xf4, 0xa3, 0x32, 0x96, 0xf2, 0x87, 0xb6,
			0x6c, 0xcc, 0xc1, 0xd7, 0x8e, 0x97, 0x02, 0x65,
			0x97, 0xf8, 0x4c, 0xc7, 0xde, 0xc1, 0x57, 0x3e,
			0x14, 0x89, 0x60, 0xfb, 0xd3, 0x5c, 0xd7, 0x35,
		}, false},
		{"strict compat", 0 |
			seccomp.FlagDenyNS | seccomp.FlagDenyTTY | seccomp.FlagDenyDevel, []byte{
			0x39, 0x87, 0x1b, 0x93, 0xff, 0xaf, 0xc8, 0xb9,
			0x79, 0xfc, 0xed, 0xc0, 0xb0, 0xc3, 0x7b, 0x9e,
			0x03, 0x92, 0x2f, 0x5b, 0x02, 0x74, 0x8d, 0xc5,
			0xc3, 0xc1, 0x7c, 0x92, 0x52, 0x7f, 0x6e, 0x02,
			0x2e, 0xde, 0x1f, 0x48, 0xbf, 0xf5, 0x92, 0x46,
			0xea, 0x45, 0x2c, 0x0d, 0x1d, 0xe5, 0x48, 0x27,
			0x80, 0x8b, 0x1a, 0x6f, 0x84, 0xf3, 0x2b, 0xbd,
			0xe1, 0xaa, 0x02, 0xae, 0x30, 0xee, 0xdc, 0xfa,
		}, false},
	}

	buf := make([]byte, 8)
	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			seccomp.CPrintln = fmsg.Println
			t.Cleanup(func() { seccomp.CPrintln = nil })

			e := seccomp.New(tc.opts)
			digest := sha512.New()

			if _, err := io.CopyBuffer(digest, e, buf); (err != nil) != tc.wantErr {
				t.Errorf("Exporter: error = %v, wantErr %v", err, tc.wantErr)
				return
			}
			if err := e.Close(); err != nil {
				t.Errorf("Close: error = %v", err)
				return
			}
			if got := digest.Sum(nil); slices.Compare(got, tc.want) != 0 {
				t.Fatalf("Export() hash = %x, want %x",
					got, tc.want)
				return
			}
		})
	}

	t.Run("close without use", func(t *testing.T) {
		e := seccomp.New(0)
		if err := e.Close(); !errors.Is(err, syscall.EINVAL) {
			t.Errorf("Close: error = %v", err)
			return
		}
	})

	t.Run("close partial read", func(t *testing.T) {
		e := seccomp.New(0)
		if _, err := e.Read(make([]byte, 0)); err != nil {
			t.Errorf("Read: error = %v", err)
			return
		}
		if err := e.Close(); err == nil || err.Error() != "seccomp_export_bpf failed: operation canceled" {
			t.Errorf("Close: error = %v", err)
			return
		}
	})
}