package config

import (
	"crypto/rand"
	"encoding/hex"
	"os"
	"path/filepath"
)

type Config struct {
	Port          string
	GinMode       string
	DataDir       string
	SessionSecret string
}

func Load() *Config {
	cfg := &Config{
		Port:          getEnv("PORT", "8080"),
		GinMode:       getEnv("GIN_MODE", "debug"),
		DataDir:       getEnv("DATA_DIR", "data"),
		SessionSecret: getEnv("SESSION_SECRET", ""),
	}
	// Generate random session secret if not provided
	if cfg.SessionSecret == "" {
		b := make([]byte, 32)
		rand.Read(b)
		cfg.SessionSecret = hex.EncodeToString(b)
	}
	// Ensure data directories exist
	os.MkdirAll(cfg.DataDir, 0o755)
	os.MkdirAll(filepath.Join(cfg.DataDir, "repos"), 0o755)
	return cfg
}

func (c *Config) DBPath() string {
	return filepath.Join(c.DataDir, "pr-helper.db")
}

func (c *Config) ReposDir() string {
	return filepath.Join(c.DataDir, "repos")
}

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