package main

import (
	"bufio"
	"os"
	"path/filepath"
	"strings"
)

// Config holds all auth configuration.
type Config struct {
	AuthBase    string
	ClientKey   string
	CacheDir    string
	MinTTLSec   int
	APIBase     string // for business API calls, defaults to AuthBase
}

// loadConfig reads ~/.openclaw/.env and builds Config.
func loadConfig() Config {
	loadEnvFile()

	authBase := strings.TrimRight(envOrDefault("AUTH_BASE", "https://api-gw-test.yuanwei-lnc.com"), "/")
	clientKey := os.Getenv("CLIENT_KEY")

	cfg := Config{
		AuthBase:  authBase,
		ClientKey: clientKey,
		CacheDir:  envOrDefault("AUTH_CACHE_DIR", "/tmp/skill-auth-cache"),
		MinTTLSec: envOrDefaultInt("AUTH_MIN_TTL_SEC", 60),
		APIBase:   strings.TrimRight(envOrDefault("ECOM_BASE", authBase), "/"),
	}

	return cfg
}

// reloadConfig re-reads .env from disk and rebuilds config.
func reloadConfig(old Config) Config {
	loadEnvFile()
	return Config{
		AuthBase:  strings.TrimRight(envOrDefault("AUTH_BASE", "https://api-gw-test.yuanwei-lnc.com"), "/"),
		ClientKey: os.Getenv("CLIENT_KEY"),
		CacheDir:  envOrDefault("AUTH_CACHE_DIR", "/tmp/skill-auth-cache"),
		MinTTLSec: envOrDefaultInt("AUTH_MIN_TTL_SEC", 60),
		APIBase:   old.APIBase, // preserve explicit override
	}
}

// loadEnvFile reads ~/.openclaw/.env into os environment.
// File values always override existing env vars (no caching).
func loadEnvFile() {
	home, err := os.UserHomeDir()
	if err != nil {
		return
	}
	envPath := filepath.Join(home, ".openclaw", ".env")

	f, err := os.Open(envPath)
	if err != nil {
		return
	}
	defer f.Close()

	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}

		idx := strings.Index(line, "=")
		if idx < 1 {
			continue
		}

		key := strings.TrimSpace(line[:idx])
		value := strings.TrimSpace(line[idx+1:])

		// strip surrounding quotes
		if len(value) >= 2 {
			if (value[0] == '"' && value[len(value)-1] == '"') ||
				(value[0] == '\'' && value[len(value)-1] == '\'') {
				value = value[1 : len(value)-1]
			}
		}

		os.Setenv(key, value)
	}
}

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

func envOrDefaultInt(key string, def int) int {
	v := os.Getenv(key)
	if v == "" {
		return def
	}
	n := 0
	for _, c := range v {
		if c < '0' || c > '9' {
			return def
		}
		n = n*10 + int(c-'0')
	}
	return n
}