package config

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

// См. официальную схему env: https://docs.rw/docs/install/subscription-page/bundled
// REMNAWAVE_PANEL_URL + REMNAWAVE_API_TOKEN (+ опционально CADDY_AUTH_API_TOKEN)

type Config struct {
	BotToken              string
	BotDebug              bool
	TelegramAdminID       int64
	RemnawaveName         string
	RemnawavePanelURL     string
	RemnawaveAPIToken     string
	CaddyAuthAPIToken     string
	RemnawaveSubscription      string
	DatabaseURL                string
	DefaultUserDays            int
	TrialUserDays              int
	DefaultExternalSquadUUID   string
	DefaultInternalSquadUUIDs  []string
}

func Load() (*Config, error) {
	token := strings.TrimSpace(os.Getenv("BOT_TOKEN"))
	if token == "" {
		return nil, fmt.Errorf("BOT_TOKEN не задан")
	}

	adminID, err := strconv.ParseInt(strings.TrimSpace(os.Getenv("TELEGRAM_ADMIN_ID")), 10, 64)
	if err != nil || adminID <= 0 {
		return nil, fmt.Errorf("TELEGRAM_ADMIN_ID не задан или неверный")
	}

	panelURL := strings.TrimRight(strings.TrimSpace(os.Getenv("REMNAWAVE_PANEL_URL")), "/")
	if panelURL == "" {
		return nil, fmt.Errorf("REMNAWAVE_PANEL_URL не задан (URL панели, см. https://docs.rw/docs/install/subscription-page/bundled)")
	}
	if !strings.HasPrefix(panelURL, "http://") && !strings.HasPrefix(panelURL, "https://") {
		return nil, fmt.Errorf("REMNAWAVE_PANEL_URL должен быть с http:// или https:// (как в документации Remnawave)")
	}

	apiToken := strings.TrimSpace(os.Getenv("REMNAWAVE_API_TOKEN"))
	if apiToken == "" {
		return nil, fmt.Errorf("REMNAWAVE_API_TOKEN не задан (Remnawave Settings → API Tokens)")
	}

	name := strings.TrimSpace(os.Getenv("REMNAWAVE_PANEL_NAME"))
	if name == "" {
		name = "Панель 1"
	}

	caddy := strings.TrimSpace(os.Getenv("CADDY_AUTH_API_TOKEN"))
	if caddy == "" {
		caddy = strings.TrimSpace(os.Getenv("REMNAWAVE_CADDY_TOKEN")) // устаревшее имя
	}

	subURL := strings.TrimRight(strings.TrimSpace(os.Getenv("REMNAWAVE_SUBSCRIPTION_URL")), "/")
	if subURL != "" && !strings.HasPrefix(subURL, "http://") && !strings.HasPrefix(subURL, "https://") {
		return nil, fmt.Errorf("REMNAWAVE_SUBSCRIPTION_URL должен начинаться с http:// или https://")
	}

	dbURL := strings.TrimSpace(os.Getenv("DATABASE_URL"))
	if dbURL == "" {
		return nil, fmt.Errorf("DATABASE_URL не задан")
	}

	days := 1
	if v := strings.TrimSpace(os.Getenv("DEFAULT_USER_DAYS")); v != "" {
		if d, err := strconv.Atoi(v); err == nil && d > 0 {
			days = d
		}
	}

	trialDays := days
	if v := strings.TrimSpace(os.Getenv("TRIAL_USER_DAYS")); v != "" {
		if d, err := strconv.Atoi(v); err == nil && d > 0 {
			trialDays = d
		}
	}

	var internalSquads []string
	if v := strings.TrimSpace(os.Getenv("DEFAULT_INTERNAL_SQUAD_UUIDS")); v != "" {
		for _, part := range strings.Split(v, ",") {
			part = strings.TrimSpace(part)
			if part != "" {
				internalSquads = append(internalSquads, part)
			}
		}
	}

	return &Config{
		BotToken:                  token,
		BotDebug:                  strings.EqualFold(strings.TrimSpace(os.Getenv("BOT_DEBUG")), "true"),
		TelegramAdminID:           adminID,
		RemnawaveName:             name,
		RemnawavePanelURL:         panelURL,
		RemnawaveAPIToken:         apiToken,
		CaddyAuthAPIToken:         caddy,
		RemnawaveSubscription:     subURL,
		DatabaseURL:               dbURL,
		DefaultUserDays:           days,
		TrialUserDays:             trialDays,
		DefaultExternalSquadUUID:  strings.TrimSpace(os.Getenv("DEFAULT_EXTERNAL_SQUAD_UUID")),
		DefaultInternalSquadUUIDs: internalSquads,
	}, nil
}