package config

import (
	"fmt"
	"os"
	"strings"
)

type Config struct {
	Port                      string
	BaseURL                   string
	GHLClientID               string
	GHLClientSecret           string
	GHLWebhookPublicKey       string
	GHLConversationProviderID string
	CastAPIKey                string
	CastAPIURL                string
	CastSenderID              string
	MongoURI                  string
	InboundAPIKey             string
}

func Load() (*Config, error) {
	c := &Config{
		Port:                      getEnvDefault("PORT", "3002"),
		BaseURL:                   os.Getenv("BASE_URL"),
		GHLClientID:               os.Getenv("GHL_CLIENT_ID"),
		GHLClientSecret:           os.Getenv("GHL_CLIENT_SECRET"),
		GHLWebhookPublicKey:       os.Getenv("GHL_WEBHOOK_PUBLIC_KEY"),
		GHLConversationProviderID: os.Getenv("GHL_CONVERSATION_PROVIDER_ID"),
		CastAPIKey:                os.Getenv("CAST_API_KEY"),
		CastAPIURL:                getEnvDefault("CAST_API_URL", "https://api.cast.ph"),
		CastSenderID:              os.Getenv("CAST_SENDER_ID"),
		MongoURI:                  os.Getenv("MONGO_URI"),
		InboundAPIKey:             os.Getenv("INBOUND_API_KEY"),
	}

	var missing []string
	required := map[string]string{
		"BASE_URL":                      c.BaseURL,
		"GHL_CLIENT_ID":                 c.GHLClientID,
		"GHL_CLIENT_SECRET":             c.GHLClientSecret,
		"GHL_WEBHOOK_PUBLIC_KEY":        c.GHLWebhookPublicKey,
		"GHL_CONVERSATION_PROVIDER_ID":  c.GHLConversationProviderID,
		"CAST_API_KEY":                  c.CastAPIKey,
		"MONGO_URI":                     c.MongoURI,
	}
	for key, val := range required {
		if val == "" {
			missing = append(missing, key)
		}
	}
	if len(missing) > 0 {
		return nil, fmt.Errorf("missing required environment variables: %s", strings.Join(missing, ", "))
	}
	return c, nil
}

func getEnvDefault(key, def string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return def
}