package lib

import (
	"encoding/hex"
	"fmt"
	"os"
)

// Config holds application configuration.
type Config struct {
	VaultKey        []byte // decoded from VAULT_KEY hex env
	Port            string // default "8765"
	DBPath          string // default "./clawvault.db"
	FireworksAPIKey string
	LLMModel        string // default llama-v3p3-70b-instruct
	SessionTTL      int64  // default 86400 (24 hours)
}

// LoadConfig loads configuration from environment variables.
func LoadConfig() (*Config, error) {
	vaultKeyHex := os.Getenv("VAULT_KEY")
	if vaultKeyHex == "" {
		return nil, fmt.Errorf("VAULT_KEY environment variable required")
	}
	vaultKey, err := hex.DecodeString(vaultKeyHex)
	if err != nil {
		return nil, fmt.Errorf("VAULT_KEY must be hex: %w", err)
	}
	if len(vaultKey) != 32 {
		return nil, fmt.Errorf("VAULT_KEY must be 32 bytes (64 hex chars)")
	}

	port := os.Getenv("PORT")
	if port == "" {
		port = "8765"
	}

	dbPath := os.Getenv("DB_PATH")
	if dbPath == "" {
		dbPath = "./clawvault.db"
	}

	fireworksKey := os.Getenv("FIREWORKS_API_KEY")
	llmModel := os.Getenv("LLM_MODEL")
	if llmModel == "" {
		llmModel = "accounts/fireworks/models/llama-v3p3-70b-instruct"
	}

	sessionTTL := int64(86400) // 24 hours default

	return &Config{
		VaultKey:        vaultKey,
		Port:            port,
		DBPath:          dbPath,
		FireworksAPIKey: fireworksKey,
		LLMModel:        llmModel,
		SessionTTL:      sessionTTL,
	}, nil
}