// Mgmt
// Copyright (C) 2013-2018+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package resources

import (
	"bytes"
	"encoding/base64"
	"encoding/gob"
	"os/user"
	"reflect"
	"strconv"
	"testing"
)

func TestSort0(t *testing.T) {
	rs := []Res{}
	s := Sort(rs)

	if !reflect.DeepEqual(s, []Res{}) {
		t.Errorf("sort failed!")
		if s == nil {
			t.Logf("output is nil!")
		} else {
			str := "Got:"
			for _, r := range s {
				str += " " + r.String()
			}
			t.Errorf(str)
		}
	}
}

func TestSort1(t *testing.T) {
	r1, _ := NewNamedResource("noop", "noop1")
	r2, _ := NewNamedResource("noop", "noop2")
	r3, _ := NewNamedResource("noop", "noop3")
	r4, _ := NewNamedResource("noop", "noop4")
	r5, _ := NewNamedResource("noop", "noop5")
	r6, _ := NewNamedResource("noop", "noop6")

	rs := []Res{r3, r2, r6, r1, r5, r4}
	s := Sort(rs)

	if !reflect.DeepEqual(s, []Res{r1, r2, r3, r4, r5, r6}) {
		t.Errorf("sort failed!")
		str := "Got:"
		for _, r := range s {
			str += " " + r.String()
		}
		t.Errorf(str)
	}

	if !reflect.DeepEqual(rs, []Res{r3, r2, r6, r1, r5, r4}) {
		t.Errorf("sort modified input!")
		str := "Got:"
		for _, r := range rs {
			str += " " + r.String()
		}
		t.Errorf(str)
	}
}

func TestMiscEncodeDecode1(t *testing.T) {
	var err error

	// encode
	var input interface{} = &FileRes{}
	b1 := bytes.Buffer{}
	e := gob.NewEncoder(&b1)
	err = e.Encode(&input) // pass with &
	if err != nil {
		t.Errorf("Gob failed to Encode: %v", err)
	}
	str := base64.StdEncoding.EncodeToString(b1.Bytes())

	// decode
	var output interface{}
	bb, err := base64.StdEncoding.DecodeString(str)
	if err != nil {
		t.Errorf("Base64 failed to Decode: %v", err)
	}
	b2 := bytes.NewBuffer(bb)
	d := gob.NewDecoder(b2)
	err = d.Decode(&output) // pass with &
	if err != nil {
		t.Errorf("Gob failed to Decode: %v", err)
	}

	res1, ok := input.(Res)
	if !ok {
		t.Errorf("Input %v is not a Res", res1)
		return
	}
	res2, ok := output.(Res)
	if !ok {
		t.Errorf("Output %v is not a Res", res2)
		return
	}
	if !res1.Compare(res2) {
		t.Error("The input and output Res values do not match!")
	}
}

func TestMiscEncodeDecode2(t *testing.T) {
	var err error

	// encode
	input, err := NewNamedResource("file", "file1")
	if err != nil {
		t.Errorf("Can't create: %v", err)
		return
	}

	b64, err := ResToB64(input)
	if err != nil {
		t.Errorf("Can't encode: %v", err)
		return
	}

	output, err := B64ToRes(b64)
	if err != nil {
		t.Errorf("Can't decode: %v", err)
		return
	}

	res1, ok := input.(Res)
	if !ok {
		t.Errorf("Input %v is not a Res", res1)
		return
	}
	res2, ok := output.(Res)
	if !ok {
		t.Errorf("Output %v is not a Res", res2)
		return
	}
	if !res1.Compare(res2) {
		t.Error("The input and output Res values do not match!")
	}
}

func TestStructTagToFieldName0(t *testing.T) {
	type TestStruct struct {
		// TODO: switch this to TestRes when it is in git master
		NoopRes        // so that this struct implements `Res`
		Alpha   bool   `lang:"alpha" yaml:"nope"`
		Beta    string `yaml:"beta"`
		Gamma   string
		Delta   int `lang:"surprise"`
	}

	mapping, err := StructTagToFieldName(&TestStruct{})
	if err != nil {
		t.Errorf("failed: %+v", err)
		return
	}

	expected := map[string]string{
		"alpha":    "Alpha",
		"surprise": "Delta",
	}

	if !reflect.DeepEqual(mapping, expected) {
		t.Errorf("expected: %+v", expected)
		t.Errorf("received: %+v", mapping)
	}
}

func TestLowerStructFieldNameToFieldName0(t *testing.T) {
	type TestStruct struct {
		// TODO: switch this to TestRes when it is in git master
		NoopRes   // so that this struct implements `Res`
		Alpha     bool
		skipMe    bool
		Beta      string
		IAmACamel uint
		pass      *string
		Gamma     string
		Delta     int
	}

	mapping, err := LowerStructFieldNameToFieldName(&TestStruct{})
	if err != nil {
		t.Errorf("failed: %+v", err)
		return
	}

	expected := map[string]string{
		"noopres": "NoopRes", // TODO: switch this to TestRes when it is in git master
		"alpha":   "Alpha",
		//"skipme": "skipMe",
		"beta":      "Beta",
		"iamacamel": "IAmACamel",
		//"pass": "pass",
		"gamma": "Gamma",
		"delta": "Delta",
	}

	if !reflect.DeepEqual(mapping, expected) {
		t.Errorf("expected: %+v", expected)
		t.Errorf("received: %+v", mapping)
	}
}

func TestLowerStructFieldNameToFieldName1(t *testing.T) {
	type TestStruct struct {
		// TODO: switch this to TestRes when it is in git master
		NoopRes // so that this struct implements `Res`
		Alpha   bool
		skipMe  bool
		Beta    string
		// these two should collide
		DoubleWord bool
		Doubleword string
		IAmACamel  uint
		pass       *string
		Gamma      string
		Delta      int
	}

	mapping, err := LowerStructFieldNameToFieldName(&TestStruct{})
	if err == nil {
		t.Errorf("expected failure, but passed with: %+v", mapping)
		return
	}
}

func TestUnknownGroup(t *testing.T) {
	gid, err := GetGID("unknowngroup")
	if err == nil {
		t.Errorf("expected failure, but passed with: %d", gid)
	}
}

func TestUnknownUser(t *testing.T) {
	uid, err := GetUID("unknownuser")
	if err == nil {
		t.Errorf("expected failure, but passed with: %d", uid)
	}
}

func TestCurrentUserGroupByName(t *testing.T) {
	// get current user
	userObj, err := user.Current()
	if err != nil {
		t.Errorf("error trying to lookup current user: %s", err.Error())
	}

	currentUID := userObj.Uid
	currentGID := userObj.Gid

	var uid int
	var gid int

	// now try to get the uid/gid via our API (via username and group name)
	if uid, err = GetUID(userObj.Username); err != nil {
		t.Errorf("error trying to lookup current user UID: %s", err.Error())
	}

	if strconv.Itoa(uid) != currentUID {
		t.Errorf("uid didn't match current user's: %s vs %s", strconv.Itoa(uid), currentUID)
	}

	if gid, err = GetGID(userObj.Username); err != nil {
		t.Errorf("error trying to lookup current user UID: %s", err.Error())
	}

	if strconv.Itoa(gid) != currentGID {
		t.Errorf("gid didn't match current user's: %s vs %s", strconv.Itoa(gid), currentGID)
	}
}

func TestCurrentUserGroupById(t *testing.T) {
	// get current user
	userObj, err := user.Current()
	if err != nil {
		t.Errorf("error trying to lookup current user: %s", err.Error())
	}

	currentUID := userObj.Uid
	currentGID := userObj.Gid

	var uid int
	var gid int

	// now try to get the uid/gid via our API (via uid and gid)
	if uid, err = GetUID(currentUID); err != nil {
		t.Errorf("error trying to lookup current user UID: %s", err.Error())
	}

	if strconv.Itoa(uid) != currentUID {
		t.Errorf("uid didn't match current user's: %s vs %s", strconv.Itoa(uid), currentUID)
	}

	if gid, err = GetGID(currentGID); err != nil {
		t.Errorf("error trying to lookup current user UID: %s", err.Error())
	}

	if strconv.Itoa(gid) != currentGID {
		t.Errorf("gid didn't match current user's: %s vs %s", strconv.Itoa(gid), currentGID)
	}
}