Code refactor

config/config.go

@@ -0,0 +1,62 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"go.yaml.in/yaml/v3"
+)
+
+type Config struct {
+	BotToken                   *string `yaml:"bot_token"`
+	AdminChatId                *int64  `yaml:"admin_chat_id"`
+	AdminChatTopicId           *int    `yaml:"admin_chat_topic_id"`
+	TargetChatId               *int64  `yaml:"target_chat_id"`
+	EntryMessage               string  `yaml:"entry_message"`
+	ApprovalMessage            string  `yaml:"approval_message"`
+	DeleteRequestAfterDecision bool    `yaml:"delete_request_after_decision"`
+}
+
+func (c *Config) LoadConfig() error {
+	f, err := os.Open("config.yaml")
+	if err != nil {
+		c.CreateConfig()
+		return fmt.Errorf("config.yaml not found, a new one has been created. Please fill it out and restart the bot")
+	}
+	defer f.Close()
+
+	decoder := yaml.NewDecoder(f)
+	err = decoder.Decode(c)
+	return err
+}
+
+func (c *Config) CreateConfig() error {
+	f, err := os.Create("config.yaml")
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	defaultConfig := Config{
+		BotToken:                   StringPtr("YOUR_BOT_TOKEN_HERE"),
+		AdminChatId:                Int64Ptr(0),
+		AdminChatTopicId:           IntPtr(0),
+		TargetChatId:               Int64Ptr(0),
+		EntryMessage:               "You have requested to join the group, please write a brief message explaining why you want to join.",
+		ApprovalMessage:            "",
+		DeleteRequestAfterDecision: false,
+	}
+
+	encoder := yaml.NewEncoder(f)
+	err = encoder.Encode(defaultConfig)
+	return err
+}
+
+// StringPtr returns a pointer to the given string.
+func StringPtr(s string) *string { return &s }
+
+// Int64Ptr returns a pointer to the given int64.
+func Int64Ptr(i int64) *int64 { return &i }
+
+// IntPtr returns a pointer to the given int.
+func IntPtr(i int) *int { return &i }