From cec5ba20663e4c0027080881f56037de92a4a96f Mon Sep 17 00:00:00 2001
From: Anony <73958752+anonyindian@users.noreply.github.com>
Date: Thu, 11 Aug 2022 10:19:06 +0000
Subject: [PATCH] fix some bugs and pre-commit for updater

---
 bot/client.go     |  2 +-
 changelog.json    |  2 +-
 main.go           |  2 ++
 modules/update.go | 40 +++++++++++++++++++++++
 utils/update.go   | 82 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 126 insertions(+), 2 deletions(-)
 create mode 100644 modules/update.go
 create mode 100644 utils/update.go

diff --git a/bot/client.go b/bot/client.go
index 9897681..7eb614e 100644
--- a/bot/client.go
+++ b/bot/client.go
@@ -69,5 +69,5 @@ func StartClient(l *logger.Logger, b *gotgbot.Bot) {
 			},
 		},
 	})
-	log.Println("STARTED")
+	log.ChangeLevel(logger.LevelMain).Println("STARTED")
 }
diff --git a/changelog.json b/changelog.json
index 899c33a..e0596b1 100644
--- a/changelog.json
+++ b/changelog.json
@@ -1,4 +1,4 @@
 {
     "Version": "0.0.0",
-    "Changes": []
+    "Changes": [""]
 }
\ No newline at end of file
diff --git a/main.go b/main.go
index 0cf9c30..49ffd5c 100644
--- a/main.go
+++ b/main.go
@@ -40,6 +40,7 @@ func main() {
 		// Clean Console
 		os.Stderr.Write([]byte("\n"))
 	}
+
 	if *delay != 0 {
 		l.Println("Delaying start for", *delay, "seconds")
 		time.Sleep(time.Second * time.Duration(*delay))
@@ -47,6 +48,7 @@ func main() {
 	if config.DEBUG {
 		l.ChangeMinimumLevel(logger.LevelDebug)
 	}
+	utils.InitUpdate(l)
 	config.Load(l)
 	handlers.DefaultPrefix = []rune{'.', '$'}
 	db.Load(l)
diff --git a/modules/update.go b/modules/update.go
new file mode 100644
index 0000000..756d594
--- /dev/null
+++ b/modules/update.go
@@ -0,0 +1,40 @@
+package modules
+
+import (
+	"fmt"
+
+	"github.com/anonyindian/gotgproto/dispatcher"
+	"github.com/anonyindian/gotgproto/dispatcher/handlers"
+	"github.com/anonyindian/gotgproto/ext"
+	"github.com/anonyindian/gotgproto/parsemode/entityhelper"
+	"github.com/gigauserbot/giga/utils"
+	"github.com/gotd/td/tg"
+)
+
+func (m *module) LoadUpdate(dp *dispatcher.CustomDispatcher) {
+	dp.AddHandler(handlers.NewCommand("changelog", changeLog))
+}
+
+func changeLog(ctx *ext.Context, u *ext.Update) error {
+	chat := u.EffectiveChat()
+	newUpdate, changed := utils.CheckChanges()
+	if !changed {
+		ctx.EditMessage(chat.GetID(), &tg.MessagesEditMessageRequest{
+			Message: "You're currently running the latest version.",
+			ID:      u.EffectiveMessage.ID,
+		})
+		return dispatcher.EndGroups
+	}
+	text := entityhelper.Combine("New GIGA Update", entityhelper.BoldEntity, entityhelper.UnderlineEntity)
+	text.Bold("\nVersion: ").Code(newUpdate.Version)
+	text.Bold("\nChange-log:")
+	for _, change := range newUpdate.Changes {
+		text.Plain(fmt.Sprintf("\n • %s", change))
+	}
+	ctx.EditMessage(chat.GetID(), &tg.MessagesEditMessageRequest{
+		Message:  text.String,
+		Entities: text.Entities,
+		ID:       u.EffectiveMessage.ID,
+	})
+	return dispatcher.EndGroups
+}
diff --git a/utils/update.go b/utils/update.go
new file mode 100644
index 0000000..fd8d502
--- /dev/null
+++ b/utils/update.go
@@ -0,0 +1,82 @@
+package utils
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"strconv"
+	"strings"
+
+	"github.com/anonyindian/logger"
+)
+
+var CurrentUpdate = &Update{}
+var currentVersion *version
+
+type Update struct {
+	Version string
+	Changes []string
+}
+
+func InitUpdate(l *logger.Logger) {
+	b, err := ioutil.ReadFile("changelog.json")
+	if err != nil {
+		l.ChangeLevel(logger.LevelCritical).Printlnf("Failed to open changelog.json: %s\n", err.Error())
+		return
+	}
+	err = json.Unmarshal(b, CurrentUpdate)
+	if err != nil {
+		l.ChangeLevel(logger.LevelCritical).Printlnf("Failed to parse changelog.json: %s\n", err.Error())
+		return
+	}
+	currentVersion, err = parseVersion(CurrentUpdate.Version)
+	if err != nil {
+		l.ChangeLevel(logger.LevelCritical).Printlnf("Failed to parse current version: %s\n", err.Error())
+		return
+	}
+}
+
+func CheckChanges() (*Update, bool) {
+	var u Update
+	origin := "https://raw.githubusercontent.com/GigaUserbot/GIGA/dev/changelog.json"
+	json.Unmarshal([]byte(origin), &u)
+	return &u, CompareVersion(u.Version)
+}
+
+// CompareVersion returns true if input version is greater than current one.
+func CompareVersion(version string) bool {
+	parsedVersion, err := parseVersion(version)
+	if err != nil {
+		return false
+	}
+	return currentVersion.compare(parsedVersion)
+}
+
+type version struct {
+	minor int
+	major int
+	patch int
+}
+
+func parseVersion(s string) (*version, error) {
+	v := version{}
+	for index, velem := range strings.Split(s, ".") {
+		vint, err := strconv.Atoi(velem)
+		if err != nil {
+			return nil, errors.New("failed to parse version")
+		}
+		switch index {
+		case 0:
+			v.major = vint
+		case 1:
+			v.minor = vint
+		case 2:
+			v.patch = vint
+		}
+	}
+	return &v, nil
+}
+
+func (v *version) compare(v1 *version) bool {
+	return (v1.major > v.major || v1.minor > v.minor || v1.patch > v.patch)
+}