package config

import (
	"fmt"
	"strings"

	"github.com/spf13/viper"
)

// Config represents the application configuration
type Config struct {
	Server struct {
		Port                int `mapstructure:"port"`
		ReadTimeoutSeconds  int `mapstructure:"read_timeout_seconds"`
		WriteTimeoutSeconds int `mapstructure:"write_timeout_seconds"`
		IdleTimeoutSeconds  int `mapstructure:"idle_timeout_seconds"`
	} `mapstructure:"server"`

	LogLevel string `mapstructure:"log_level"`

	Google struct {
		ProjectID       string `mapstructure:"project_id"`
		Location        string `mapstructure:"location"`
		Dataset         string `mapstructure:"dataset"`
		DicomStore      string `mapstructure:"dicom_store"`
		CredentialsPath string `mapstructure:"credentials_path"`
	} `mapstructure:"google"`

	AllowedOrigins []string `mapstructure:"allowed_origins"`
}

// Load reads configuration from file and environment variables
func Load() (*Config, error) {
	viper.SetConfigName("config")
	viper.SetConfigType("yaml")
	viper.AddConfigPath("./config")
	viper.AddConfigPath(".")

	viper.AutomaticEnv()
	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))

	if err := viper.ReadInConfig(); err != nil {
		return nil, fmt.Errorf("failed to read config file: %w", err)
	}

	var cfg Config
	if err := viper.Unmarshal(&cfg); err != nil {
		return nil, fmt.Errorf("failed to unmarshal config: %w", err)
	}

	return &cfg, nil
}