package botcfg

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

type Config struct {
	TGToken     string
	AllowedIDs  []int64
	WritePort   int
	ControlPort int
	PreferIface string
}

func Load() *Config {
	cfg := &Config{
		WritePort:   8016,
		ControlPort: 8017,
		PreferIface: "WLAN",
	}

	_, filename, _, _ := runtime.Caller(0)
	srcDir := filepath.Dir(filename)
	rootDir := filepath.Dir(filepath.Dir(filepath.Dir(srcDir)))

	envPaths := []string{
		filepath.Join(rootDir, "bot-go", ".env"),
		filepath.Join(rootDir, ".env"),
	}
	var f *os.File
	var err error
	for _, envPath := range envPaths {
		f, err = os.Open(envPath)
		if err == nil { break }
	}
	if err != nil { return cfg }
	defer f.Close()

	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())
		if line == "" || strings.HasPrefix(line, "#") { continue }
		parts := strings.SplitN(line, "=", 2)
		if len(parts) != 2 { continue }
		key := strings.TrimSpace(parts[0])
		val := strings.TrimSpace(parts[1])
		if os.Getenv(key) == "" { os.Setenv(key, val) }
	}

	cfg.TGToken = os.Getenv("TG_BOT_TOKEN")
	allowedStr := os.Getenv("TG_ALLOWED_CHAT_IDS")
	if allowedStr != "" {
		for _, s := range strings.Split(allowedStr, ",") {
			s = strings.TrimSpace(s)
			if id, err := strconv.ParseInt(s, 10, 64); err == nil { cfg.AllowedIDs = append(cfg.AllowedIDs, id) }
		}
	}
	if p := os.Getenv("WRITE_PORT"); p != "" {
		if port, err := strconv.Atoi(p); err == nil { cfg.WritePort = port }
	}
	if p := os.Getenv("BOT_PORT"); p != "" {
		if port, err := strconv.Atoi(p); err == nil { cfg.ControlPort = port }
	}
	if p := os.Getenv("PREFER_IFACE"); p != "" { cfg.PreferIface = p }

	return cfg
}