fuj-management/go/internal/config/config.go

package config

import (
	"os"
	"strconv"
	"strings"
	"time"
)

// Google Sheets IDs — change in code if sheets change (not from env).
const (
	AttendanceSheetID = "1E2e_gT_K5AwSRCDLDTa2UetZTkHmBOcz0kFbBUNUNBA"
	PaymentsSheetID   = "1Om0YPoDVCH5cV8BrNz5LG5eR5MMU05ypQC7UMN1xn_Y"

	// Both attendance tabs live in the same Google Spreadsheet (AttendanceSheetID).
	// The original adult and junior attendance data lives in separate source spreadsheets,
	// but is collected into this one sheet via IMPORTRANGE — one tab per group.
	// Tabs are identified by the gid= query param in the CSV export URL.
	AttendanceAdultSheetGID = "0"          // gid=0 — adult practices tab (IMPORTRANGE'd)
	JuniorSheetGID          = "1213318614" // gid=1213318614 — junior practices tab (IMPORTRANGE'd)
)

// CacheSheetMap mirrors scripts/config.py CACHE_SHEET_MAP.
// Maps a cache key to the Google Sheet ID whose Drive modifiedTime gates it.
// Both attendance keys map to the same spreadsheet — different tabs, one Drive file.
var CacheSheetMap = map[string]string{
	"attendance_regular":    AttendanceSheetID,
	"attendance_juniors":    AttendanceSheetID,
	"exceptions_dict":       PaymentsSheetID,
	"payments_transactions": PaymentsSheetID,
}

// Config holds all runtime configuration loaded from environment variables.
// Mirrors scripts/config.py.
type Config struct {
	CredentialsPath  string
	BankAccount      string
	CacheDir         string
	CacheTTL         time.Duration
	CacheAPICheckTTL time.Duration
	DriveTimeout     time.Duration
	LogLevel         string
	FioAPIToken      string
	ServerAddr       string
}

// Load reads configuration from the environment, applying defaults that
// match the Python side.
func Load() Config {
	return Config{
		CredentialsPath:  env("CREDENTIALS_PATH", ".secret/fuj-management-bot-credentials.json"),
		BankAccount:      env("BANK_ACCOUNT", "CZ8520100000002800359168"),
		CacheDir:         env("CACHE_DIR", "tmp"),
		CacheTTL:         envDuration("CACHE_TTL_SECONDS", 300),
		CacheAPICheckTTL: envDuration("CACHE_API_CHECK_TTL_SECONDS", 300),
		DriveTimeout:     envDuration("DRIVE_TIMEOUT_SECONDS", 10),
		LogLevel:         env("LOG_LEVEL", "INFO"),
		FioAPIToken:      env("FIO_API_TOKEN", ""),
		ServerAddr:       env("SERVER_ADDR", ":8080"),
	}
}

// IBANAccountNum extracts the bare account number from a Czech IBAN.
// "CZ8520100000002800359168" → "2800359168"
// Structure: CZ(2 check)(4 bank code)(16 zero-padded account).
func IBANAccountNum(iban string) string {
	s := strings.ReplaceAll(iban, " ", "")
	if len(s) < 8 {
		return iban
	}
	raw := s[8:] // 16-digit zero-padded account portion
	n := strings.TrimLeft(raw, "0")
	if n == "" {
		return "0"
	}
	return n
}

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

func envDuration(key string, defaultSeconds int) time.Duration {
	if v := os.Getenv(key); v != "" {
		if n, err := strconv.Atoi(v); err == nil && n > 0 {
			return time.Duration(n) * time.Second
		}
	}
	return time.Duration(defaultSeconds) * time.Second
}