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"`
	PhoneNumber string `json:"phone_number"`
	SessionPath string `json:"session_path"`
	ShowQR      bool   `json:"show_qr,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"
	}

	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)
}