package dataswamp

import (
	"bytes"
	"fmt"
	"caj-larsson/bog/dataswamp/swampfile"
	"github.com/matryer/is"
	"github.com/spf13/afero"
	"testing"
	"time"
	"caj-larsson/bog/dataswamp/namespace"
	m_namespace "caj-larsson/bog/infrastructure/memory/namespace"
	m_swampfile "caj-larsson/bog/infrastructure/memory/swampfile"
	"caj-larsson/bog/infrastructure/system_time"
)

type TestLogger struct{}

func (t TestLogger) Debug(format string, a ...interface{}) {}
func (t TestLogger) Info(format string, a ...interface{})  {}
func (t TestLogger) Warn(format string, a ...interface{})  {}

var file_ref1 = swampfile.FileReference{"/path1", "ns1"}
var file_ref2 = swampfile.FileReference{"/path1", "ns2"}
var file_ref3 = swampfile.FileReference{"/path2", "ns1"}

func NewTestSwampFileService() SwampFileService {
	file_repo := m_swampfile.NewRepository()
	ns_repo := m_namespace.NewRepository()

	logger := TestLogger {}
	ns_svc := namespace.NewNamespaceService(
		ns_repo,
		logger,
		system_time.Clock{},
		time.Hour,
		1024,
	)

	return *NewSwampFileService(*ns_svc, file_repo, logger)
}

func TestFileDontExist(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()
	outfile, err := s.OpenOutFile(file_ref1)

	is.True(err == swampfile.ErrNotExists)
	is.True(outfile == nil)
}

func TestFileIsStored(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()

	fakefile := bytes.NewBufferString("My bog data")

	err := s.SaveFile(file_ref1, fakefile, int64(fakefile.Len()))

	is.NoErr(err)

	largefakefile := bytes.NewBufferString("")

	for largefakefile.Len() < 64000 {
		_, err = largefakefile.WriteString("A very repetitive file")
	}

	err = s.SaveFile(file_ref3, largefakefile, int64(largefakefile.Len()))

	is.Equal(err, swampfile.ErrExceedQuota)
}

func TestFileIsReadBack(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()

	infile := bytes.NewBufferString("My bog data")

	_ = s.SaveFile(file_ref1, infile, int64(infile.Len()))

	outswampfile, _ := s.OpenOutFile(file_ref1)

	outfile := bytes.NewBufferString("")
	_, _ = outfile.ReadFrom(outswampfile)

	is.Equal(outfile.String(), "My bog data")
}

func TestNSIsolation(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()

	ns1_file := bytes.NewBufferString("My bog data ns1")
	ns2_file := bytes.NewBufferString("My bog data ns2")

	_ = s.SaveFile(file_ref1, ns1_file, int64(ns1_file.Len()))
	_ = s.SaveFile(file_ref2, ns2_file, int64(ns2_file.Len()))

	outswampfile, _ := s.OpenOutFile(file_ref1)

	outfile := bytes.NewBufferString("")
	_, _ = outfile.ReadFrom(outswampfile)

	is.Equal(outfile.String(), "My bog data ns1")
}

func TestPathStrictMode(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()

	ns_file := bytes.NewBufferString("My bog data ns1")

	ref := swampfile.FileReference{
		"/path/../with/../backrefs",
		"ns1",
	}

	outfile, err := s.OpenOutFile(ref)

	is.Equal(err, swampfile.ErrUnacceptablePath)
	is.Equal(outfile, nil)

	err = s.SaveFile(ref, ns_file, int64(ns_file.Len()))
	is.Equal(err, swampfile.ErrUnacceptablePath)
}

func TestQuotaWithContenSizeLieOver(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()

	largefakefile := bytes.NewBufferString("")

	for largefakefile.Len() < 64000 {
		_, _ = largefakefile.WriteString("A very repetitive file")
	}

	err := s.SaveFile(file_ref3, largefakefile, int64(10))

	is.Equal(err, swampfile.ErrContentSizeExceeded)
}

func TestQuotaWithContenSizeLieUnder(t *testing.T) {
	is := is.New(t)
	s := NewTestSwampFileService()

	largefakefile := bytes.NewBufferString("small")

	err := s.SaveFile(file_ref3, largefakefile, int64(1024))

	is.Equal(err, swampfile.ErrContentSizeExaggerated)
}

func TestCleanUpExpired(t *testing.T) {
	is := is.New(t)

	fs := afero.NewMemMapFs()
	file_repo := m_swampfile.Repository{fs}
	ns_repo := m_namespace.NewRepository()
	logger := TestLogger{}
	ns_svc := namespace.NewNamespaceService(
		ns_repo,
		logger,
		system_time.Clock{},
		time.Hour,
		1024,
	)

	s := NewSwampFileService(*ns_svc, file_repo, logger)

	fakefile := bytes.NewBufferString("My bog")
	err := s.SaveFile(file_ref1, fakefile, int64(fakefile.Len()))
	is.NoErr(err)

	fakefile = bytes.NewBufferString("My bog")
	err = s.SaveFile(file_ref3, fakefile, int64(fakefile.Len()))
	is.NoErr(err)

	err = fs.Chtimes("1/path1", time.Now(), time.Date(2000, 1, 1, 0, 0, 0, 0, time.UTC))

	is.NoErr(s.CleanUpExpiredFiles())

	ns, err := ns_repo.GetByName("ns1")
	fmt.Printf("file final usage  %v\n", ns.FileQuota)
	is.NoErr(err)
	fmt.Printf("file\n" )
	is.Equal(ns.FileQuota.CurrentUsage, int64(len("My bog")))
}