package pkg_test

//go:generate env CGO_ENABLED=0 go build -tags testtool -o testdata/testtool ./testdata

import (
	_ "embed"
	"errors"
	"log"
	"os"
	"os/exec"
	"testing"

	"hakurei.app/container/check"
	"hakurei.app/container/fhs"
	"hakurei.app/container/stub"
	"hakurei.app/hst"
	"hakurei.app/internal/pkg"
	"hakurei.app/message"
)

// testtoolBin is the container test tool binary made available to the
// execArtifact for testing its curing environment.
//
//go:embed testdata/testtool
var testtoolBin []byte

func TestExec(t *testing.T) {
	t.Parallel()

	wantChecksumOffline := pkg.MustDecode(
		"GPa4aBakdSJd7Tz7LYj_VJFoojzyZinmVcG3k6M5xI6CZ821J5sXLhLDDuS47gi9",
	)

	checkWithCache(t, []cacheTestCase{
		{"offline", nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
			c.SetStrict(true)
			testtool, testtoolDestroy := newTesttool()

			msg := message.New(log.New(os.Stderr, "container: ", 0))
			msg.SwapVerbose(testing.Verbose())

			cureMany(t, c, []cureStep{
				{"container", pkg.NewExec(
					t.Context(),
					msg,
					0,
					nil,
					check.MustAbs("/work"),
					[]string{"HAKUREI_TEST=1"},
					check.MustAbs("/opt/bin/testtool"),
					[]string{"testtool"},

					pkg.MustPath("/file", newStubFile(
						pkg.KindHTTPGet,
						pkg.ID{0xfe, 0},
						nil,
						nil, nil,
					)),
					pkg.MustPath("/.hakurei", stubArtifact{
						kind:   pkg.KindTar,
						params: []byte("empty directory"),
						cure: func(c *pkg.CureContext) error {
							return os.MkdirAll(c.GetWorkDir().String(), 0700)
						},
					}),
					pkg.MustPath("/opt", testtool),
				), ignorePathname, wantChecksumOffline, nil},

				{"error passthrough", pkg.NewExec(
					t.Context(),
					msg,
					0,
					nil,
					check.MustAbs("/work"),
					[]string{"HAKUREI_TEST=1"},
					check.MustAbs("/opt/bin/testtool"),
					[]string{"testtool"},

					pkg.MustPath("/proc/nonexistent", stubArtifact{
						kind:   pkg.KindTar,
						params: []byte("doomed artifact"),
						cure: func(c *pkg.CureContext) error {
							return stub.UniqueError(0xcafe)
						},
					}),
				), nil, pkg.Checksum{}, errors.Join(stub.UniqueError(0xcafe))},

				{"invalid paths", pkg.NewExec(
					t.Context(),
					msg,
					0,
					nil,
					check.MustAbs("/work"),
					[]string{"HAKUREI_TEST=1"},
					check.MustAbs("/opt/bin/testtool"),
					[]string{"testtool"},

					pkg.ExecContainerPath{},
				), nil, pkg.Checksum{}, os.ErrInvalid},
			})

			// check init failure passthrough
			var exitError *exec.ExitError
			if _, _, err := c.Cure(pkg.NewExec(
				t.Context(),
				msg,
				0,
				nil,
				check.MustAbs("/work"),
				nil,
				check.MustAbs("/opt/bin/testtool"),
				[]string{"testtool"},
			)); !errors.As(err, &exitError) ||
				exitError.ExitCode() != hst.ExitFailure {
				t.Fatalf("Cure: error = %v, want init exit status 1", err)
			}

			testtoolDestroy(t, base, c)
		}, pkg.MustDecode("7PoPpWLjFPXIymbuIYLZAzOpCYr-2PN4CZ11jFdO-mDlnZNgFO3JyOtK8HW8Jxvm")},

		{"net", nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
			c.SetStrict(true)
			testtool, testtoolDestroy := newTesttool()

			msg := message.New(log.New(os.Stderr, "container: ", 0))
			msg.SwapVerbose(testing.Verbose())

			wantChecksum := pkg.MustDecode(
				"a1F_i9PVQI4qMcoHgTQkORuyWLkC1GLIxOhDt2JpU1NGAxWc5VJzdlfRK-PYBh3W",
			)
			cureMany(t, c, []cureStep{
				{"container", pkg.NewExec(
					t.Context(),
					msg,
					0,
					&wantChecksum,
					check.MustAbs("/work"),
					[]string{"HAKUREI_TEST=1"},
					check.MustAbs("/opt/bin/testtool"),
					[]string{"testtool", "net"},

					pkg.MustPath("/file", newStubFile(
						pkg.KindHTTPGet,
						pkg.ID{0xfe, 0},
						nil,
						nil, nil,
					)),
					pkg.MustPath("/.hakurei", stubArtifact{
						kind:   pkg.KindTar,
						params: []byte("empty directory"),
						cure: func(c *pkg.CureContext) error {
							return os.MkdirAll(c.GetWorkDir().String(), 0700)
						},
					}),
					pkg.MustPath("/opt", testtool),
				), ignorePathname, wantChecksum, nil},
			})

			testtoolDestroy(t, base, c)
		}, pkg.MustDecode("bBQVFIt0FnOulljgpLnGtuzHSFgwiCMjc4pmc4rHRqXKQ60Q5aBVYp5f6aH9VdZi")},

		{"overlay root", nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
			c.SetStrict(true)
			testtool, testtoolDestroy := newTesttool()

			msg := message.New(log.New(os.Stderr, "container: ", 0))
			msg.SwapVerbose(testing.Verbose())

			cureMany(t, c, []cureStep{
				{"container", pkg.NewExec(
					t.Context(),
					msg,
					0,
					nil,
					check.MustAbs("/work"),
					[]string{"HAKUREI_TEST=1", "HAKUREI_ROOT=1"},
					check.MustAbs("/opt/bin/testtool"),
					[]string{"testtool"},

					pkg.MustPath("/", stubArtifact{
						kind:   pkg.KindTar,
						params: []byte("empty directory"),
						cure: func(c *pkg.CureContext) error {
							return os.MkdirAll(c.GetWorkDir().String(), 0700)
						},
					}),
					pkg.MustPath("/opt", testtool),
				), ignorePathname, wantChecksumOffline, nil},
			})

			testtoolDestroy(t, base, c)
		}, pkg.MustDecode("gFT9kprYBqEJKifJIl2sHn_3TgULWVLTU4DrYAHiGcRmcdFRZ0YtjiROW820cAEc")},

		{"overlay temp", nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
			c.SetStrict(true)
			testtool, testtoolDestroy := newTesttool()

			msg := message.New(log.New(os.Stderr, "container: ", 0))
			msg.SwapVerbose(testing.Verbose())

			cureMany(t, c, []cureStep{
				{"container", pkg.NewExec(
					t.Context(),
					msg,
					0,
					nil,
					check.MustAbs("/work"),
					[]string{"HAKUREI_TEST=1", "HAKUREI_ROOT=1"},
					check.MustAbs("/tmp/bin/testtool"),
					[]string{"testtool"},

					pkg.MustPath("/", stubArtifact{
						kind:   pkg.KindTar,
						params: []byte("empty directory"),
						cure: func(c *pkg.CureContext) error {
							return os.MkdirAll(c.GetWorkDir().String(), 0700)
						},
					}),
					pkg.MustPath("/tmp/", stubArtifact{
						kind:   pkg.KindTar,
						params: []byte("empty directory"),
						cure: func(c *pkg.CureContext) error {
							return os.MkdirAll(c.GetWorkDir().String(), 0700)
						},
					}),
					pkg.ExecContainerPath{
						P: fhs.AbsTmp,
						A: testtool,
					},
				), ignorePathname, wantChecksumOffline, nil},
			})

			testtoolDestroy(t, base, c)
		}, pkg.MustDecode("_r1IBeMWCkLwQ9Im9w0tV9_CWIOfQlXkkP2CogPHLmZp_AB6W3_8HVZqDV00dNAm")},
	})
}

// newTesttool returns an [Artifact] that cures into testtoolBin. The returned
// function must be called at the end of the test but not deferred.
func newTesttool() (
	testtool pkg.Artifact,
	testtoolDestroy func(t *testing.T, base *check.Absolute, c *pkg.Cache),
) {
	// testtoolBin is built during go:generate and is not deterministic
	testtool = overrideIdent{pkg.ID{0xfe, 0xff}, stubArtifact{
		kind: pkg.KindTar,
		cure: func(c *pkg.CureContext) error {
			work := c.GetWorkDir()
			if err := os.MkdirAll(
				work.Append("bin").String(),
				0700,
			); err != nil {
				return err
			}
			return os.WriteFile(c.GetWorkDir().Append(
				"bin",
				"testtool",
			).String(), testtoolBin, 0500)
		},
	}}
	testtoolDestroy = func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
		if pathname, checksum, err := c.Cure(testtool); err != nil {
			t.Fatalf("Cure: error = %v", err)
		} else if err = os.Remove(pathname.String()); err != nil {
			t.Fatal(err)
		} else {
			p := base.Append(
				"checksum",
				pkg.Encode(checksum),
			)
			if err = os.Chmod(p.Append("bin").String(), 0700); err != nil {
				t.Fatal(err)
			}
			if err = os.Chmod(p.String(), 0700); err != nil {
				t.Fatal(err)
			}
			if err = os.RemoveAll(p.String()); err != nil {
				t.Fatal(err)
			}
		}
	}
	return
}