1 files changed, 125 insertions, 0 deletions
diff --git a/backend/internal/config/config.go b/backend/internal/config/config.go
new file mode 100644
index 0000000..60d176e
--- /dev/null
+++ b/backend/internal/config/config.go
@@ -0,0 +1,125 @@
+package config
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+)
+
+type Config struct {
+	Server   ServerConfig   `json:"server"`
+	Database DatabaseConfig `json:"database"`
+	Monitor  MonitorConfig  `json:"monitor"`
+	SMTP     SMTPConfig     `json:"smtp"`
+	Auth     AuthConfig     `json:"auth"`
+}
+
+type SMTPConfig struct {
+	Host     string `json:"host"`
+	Port     int    `json:"port"`
+	Username string `json:"username"`
+	Password string `json:"password"`
+	From     string `json:"from"`
+}
+
+type AuthConfig struct {
+	AdminUsername     string `json:"admin_username"`
+	AdminPasswordHash string `json:"admin_password_hash"`
+	JWTSecret         string `json:"jwt_secret"`
+}
+
+type ServerConfig struct {
+	Addr string `json:"addr"`
+}
+
+type DatabaseConfig struct {
+	URL string `json:"url"`
+}
+
+type MonitorConfig struct {
+	Interval string `json:"interval"`
+	Timeout  string `json:"timeout"`
+}
+
+func Load(path string) (*Config, error) {
+	if path == "" {
+		path = "config.json"
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("ler config %s: %w", path, err)
+	}
+
+	var cfg Config
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return nil, fmt.Errorf("parse config %s: %w", path, err)
+	}
+
+	cfg.applyDefaults()
+	return &cfg, nil
+}
+
+func (c *Config) applyDefaults() {
+	if c.Server.Addr == "" {
+		c.Server.Addr = ":8080"
+	}
+	if c.Monitor.Interval == "" {
+		c.Monitor.Interval = "60s"
+	}
+	if c.Monitor.Timeout == "" {
+		c.Monitor.Timeout = "10s"
+	}
+}
+
+func (c *Config) ServerAddr() string {
+	if v := os.Getenv("ADDR"); v != "" {
+		return v
+	}
+	return c.Server.Addr
+}
+
+func (c *Config) DatabaseURL() string {
+	if v := os.Getenv("DATABASE_URL"); v != "" {
+		return v
+	}
+	return c.Database.URL
+}
+
+func (c *Config) CheckInterval() time.Duration {
+	d, err := time.ParseDuration(c.Monitor.Interval)
+	if err != nil {
+		return 60 * time.Second
+	}
+	return d
+}
+
+func (c *Config) CheckTimeout() time.Duration {
+	d, err := time.ParseDuration(c.Monitor.Timeout)
+	if err != nil {
+		return 10 * time.Second
+	}
+	return d
+}
+
+func (c *Config) AdminUsername() string {
+	if v := os.Getenv("ADMIN_USERNAME"); v != "" {
+		return v
+	}
+	return c.Auth.AdminUsername
+}
+
+func (c *Config) AdminPasswordHash() string {
+	if v := os.Getenv("ADMIN_PASSWORD_HASH"); v != "" {
+		return v
+	}
+	return c.Auth.AdminPasswordHash
+}
+
+func (c *Config) JWTSecret() string {
+	if v := os.Getenv("JWT_SECRET"); v != "" {
+		return v
+	}
+	return c.Auth.JWTSecret
+}