package config

import "os"

const (
	defaultHTTPAddr        = ":8080"
	defaultEnvironment     = "development"
	defaultModelKey        = "deepseek-v4-flash"
	defaultImageModelKey   = "gpt-image-v2"
	defaultThirdOneBin     = "thirdone"
	defaultWorkflowRuntime = ""
)

type Config struct {
	HTTPAddr        string
	Environment     string
	WorkflowRuntime string
	ModelKey        string
	ImageModelKey   string
	ThirdOneBin     string
}

func LoadFromEnv() Config {
	return Config{
		HTTPAddr:        envOrDefault("TUTOR_HTTP_ADDR", defaultHTTPAddr),
		Environment:     envOrDefault("TUTOR_ENV", defaultEnvironment),
		WorkflowRuntime: envOrDefault("TUTOR_WORKFLOW_RUNTIME", defaultWorkflowRuntime),
		ModelKey:        envOrDefault("TUTOR_MODEL_KEY", defaultModelKey),
		ImageModelKey:   envOrDefault("TUTOR_IMAGE_MODEL_KEY", defaultImageModelKey),
		ThirdOneBin:     envOrDefault("THIRDONE_BIN", defaultThirdOneBin),
	}
}

func envOrDefault(key string, fallback string) string {
	value := os.Getenv(key)
	if value == "" {
		return fallback
	}
	return value
}