package domain

import (
	"fmt"
	"math"
	"strings"
	"unicode"
)

// ComputeDailySalary calculates salary for a single day's work.
func ComputeDailySalary(workSeconds int64, hourlyRate float64) float64 {
	hours := float64(workSeconds) / SecondsPerHour
	return math.Round(hours*hourlyRate*SalaryRoundFactor) / SalaryRoundFactor
}

// CurrencySymbol extracts the first token as symbol, defaulting to "$".
func CurrencySymbol(currency string) string {
	if parts := strings.Fields(currency); len(parts) >= 1 && parts[0] != "" {
		return parts[0]
	}
	return "$"
}

// FormatSalary formats a salary estimate into a readable string.
func (e SalaryEstimate) FormatSalary(currency string) string {
	sym := CurrencySymbol(currency)
	code := "USD"
	if parts := strings.Fields(currency); len(parts) >= 2 {
		code = parts[1]
	}
	return fmt.Sprintf("%s%.2f %s", sym, e.GrossEarning, code)
}

// FormatSalaryShort returns just the symbol + amount.
func (e SalaryEstimate) FormatSalaryShort(currency string) string {
	return fmt.Sprintf("%s%.2f", CurrencySymbol(currency), e.GrossEarning)
}

// ParseCurrencyInput validates and normalizes currency input (symbol + code).
func ParseCurrencyInput(s string) (string, string) {
	parts := strings.Fields(s)
	if len(parts) < 2 {
		return "", "Please provide both symbol and code.\nUsage: /setcurrency <symbol> <code>\nExamples:\n/setcurrency $ USD\n/setcurrency T Toman\n/setcurrency IRR Rial"
	}
	for _, p := range parts[:2] {
		if len(p) > 10 || strings.ContainsFunc(p, unicode.IsControl) {
			return "", "Invalid currency. Use short printable strings like $ USD, T Toman, IRR Rial."
		}
	}
	return parts[0] + " " + parts[1], ""
}