Use config from .env and update api

src/database/connection.go

@@ -2,8 +2,10 @@ package database
 
 import (
 	"log"
+	"sheetless-server/config"
 	"sheetless-server/models"
 
+	"golang.org/x/crypto/bcrypt"
 	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
 )
@@ -12,16 +14,59 @@ var DB *gorm.DB
 
 func InitDatabase() {
 	var err error
+
 	DB, err = gorm.Open(sqlite.Open("sheetless.db"), &gorm.Config{})
 	if err != nil {
 		log.Fatal("Failed to connect to database:", err)
 	}
 
+	tables, err := DB.Migrator().GetTables()
+	if err != nil {
+		log.Fatal("Failed to list tables of database:", err)
+	}
+	isNewDatabase := len(tables) == 0
+
 	// Auto migrate the schema
 	err = DB.AutoMigrate(&models.User{}, &models.Sheet{}, &models.Composer{})
 	if err != nil {
 		log.Fatal("Failed to migrate database:", err)
 	}
 
+	if isNewDatabase {
+		createDefaultAdminUser()
+	}
+
 	log.Println("Database connected and migrated successfully")
 }
+
+func createDefaultAdminUser() {
+	// Check if admin user already exists
+	var existingUser models.User
+	err := DB.Where("email = ?", config.AppConfig.Admin.Email).First(&existingUser).Error
+	if err == nil {
+		// Admin user already exists, don't recreate
+		log.Printf("Admin user already exists: %s", config.AppConfig.Admin.Email)
+		return
+	}
+
+	// Hash the admin password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(config.AppConfig.Admin.Password), bcrypt.DefaultCost)
+	if err != nil {
+		log.Printf("Failed to hash admin password: %v", err)
+		return
+	}
+
+	// Create admin user
+	adminUser := models.User{
+		Username: "admin",
+		Email:    config.AppConfig.Admin.Email,
+		Password: string(hashedPassword),
+	}
+
+	if err := DB.Create(&adminUser).Error; err != nil {
+		log.Printf("Failed to create admin user: %v", err)
+		return
+	}
+
+	log.Printf("Default admin user created with email: %s", config.AppConfig.Admin.Email)
+}