Major refactor to library

pkg/config/config.go

@@ -0,0 +1,153 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+)
+
+// Config represents the application configuration
+type Config struct {
+	Server      ServerConfig      `json:"server"`
+	WhatsApp    []WhatsAppConfig  `json:"whatsapp"`
+	Hooks       []Hook            `json:"hooks"`
+	Database    DatabaseConfig    `json:"database,omitempty"`
+	Media       MediaConfig       `json:"media"`
+	EventLogger EventLoggerConfig `json:"event_logger,omitempty"`
+	LogLevel    string            `json:"log_level"`
+}
+
+// ServerConfig holds server-specific configuration
+type ServerConfig struct {
+	Host               string `json:"host"`
+	Port               int    `json:"port"`
+	DefaultCountryCode string `json:"default_country_code,omitempty"`
+	Username           string `json:"username,omitempty"`
+	Password           string `json:"password,omitempty"`
+	AuthKey            string `json:"auth_key,omitempty"`
+}
+
+// WhatsAppConfig holds configuration for a WhatsApp account
+type WhatsAppConfig struct {
+	ID          string              `json:"id"`
+	Type        string              `json:"type"` // "whatsmeow" or "business-api"
+	PhoneNumber string              `json:"phone_number"`
+	SessionPath string              `json:"session_path,omitempty"`
+	ShowQR      bool                `json:"show_qr,omitempty"`
+	BusinessAPI *BusinessAPIConfig  `json:"business_api,omitempty"`
+}
+
+// BusinessAPIConfig holds configuration for WhatsApp Business API
+type BusinessAPIConfig struct {
+	PhoneNumberID     string `json:"phone_number_id"`
+	AccessToken       string `json:"access_token"`
+	BusinessAccountID string `json:"business_account_id,omitempty"`
+	APIVersion        string `json:"api_version,omitempty"` // Default: v21.0
+	WebhookPath       string `json:"webhook_path,omitempty"`
+	VerifyToken       string `json:"verify_token,omitempty"`
+}
+
+// Hook represents a registered webhook
+type Hook struct {
+	ID          string            `json:"id"`
+	Name        string            `json:"name"`
+	URL         string            `json:"url"`
+	Method      string            `json:"method"`
+	Headers     map[string]string `json:"headers,omitempty"`
+	Active      bool              `json:"active"`
+	Events      []string          `json:"events,omitempty"`
+	Description string            `json:"description,omitempty"`
+}
+
+// DatabaseConfig holds database connection information
+type DatabaseConfig struct {
+	Type       string `json:"type"`
+	Host       string `json:"host"`
+	Port       int    `json:"port"`
+	Username   string `json:"username"`
+	Password   string `json:"password"`
+	Database   string `json:"database"`
+	SQLitePath string `json:"sqlite_path,omitempty"` // Path to SQLite database file
+}
+
+// MediaConfig holds media storage and delivery configuration
+type MediaConfig struct {
+	DataPath string `json:"data_path"`
+	Mode     string `json:"mode"` // "base64", "link", or "both"
+	BaseURL  string `json:"base_url,omitempty"` // Base URL for media links
+}
+
+// EventLoggerConfig holds event logging configuration
+type EventLoggerConfig struct {
+	Enabled bool     `json:"enabled"`
+	Targets []string `json:"targets"` // "file", "sqlite", "postgres"
+
+	// File-based logging
+	FileDir string `json:"file_dir,omitempty"` // Base directory for event files
+
+	// Database logging (uses main Database config for connection)
+	TableName string `json:"table_name,omitempty"` // Table name for event logs (default: "event_logs")
+}
+
+// Load reads configuration from a file
+func Load(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var cfg Config
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return nil, err
+	}
+
+	// Set defaults
+	if cfg.LogLevel == "" {
+		cfg.LogLevel = "info"
+	}
+	if cfg.Server.Host == "" {
+		cfg.Server.Host = "localhost"
+	}
+	if cfg.Server.Port == 0 {
+		cfg.Server.Port = 8080
+	}
+	if cfg.Media.DataPath == "" {
+		cfg.Media.DataPath = "./data/media"
+	}
+	if cfg.Media.Mode == "" {
+		cfg.Media.Mode = "link"
+	}
+	if cfg.EventLogger.FileDir == "" {
+		cfg.EventLogger.FileDir = "./data/events"
+	}
+	if cfg.EventLogger.TableName == "" {
+		cfg.EventLogger.TableName = "event_logs"
+	}
+	if cfg.Database.SQLitePath == "" {
+		cfg.Database.SQLitePath = "./data/events.db"
+	}
+
+	// Default WhatsApp account type to whatsmeow for backwards compatibility
+	for i := range cfg.WhatsApp {
+		if cfg.WhatsApp[i].Type == "" {
+			cfg.WhatsApp[i].Type = "whatsmeow"
+		}
+		// Set default API version for Business API
+		if cfg.WhatsApp[i].Type == "business-api" && cfg.WhatsApp[i].BusinessAPI != nil {
+			if cfg.WhatsApp[i].BusinessAPI.APIVersion == "" {
+				cfg.WhatsApp[i].BusinessAPI.APIVersion = "v21.0"
+			}
+		}
+	}
+
+	return &cfg, nil
+}
+
+// Save writes configuration to a file
+func Save(path string, cfg *Config) error {
+	data, err := json.MarshalIndent(cfg, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(path, data, 0644)
+}