package auth

import (
	"strings"

	"github.com/perfect-panel/server/internal/config"
)

// IsEmailDomainWhitelisted checks if the email's domain is in the comma-separated whitelist.
// Returns false if the email format is invalid.
func IsEmailDomainWhitelisted(email, whitelistCSV string) bool {
	if whitelistCSV == "" {
		return false
	}
	parts := strings.SplitN(email, "@", 2)
	if len(parts) != 2 {
		return false
	}
	domain := strings.ToLower(strings.TrimSpace(parts[1]))
	for _, d := range strings.Split(whitelistCSV, ",") {
		if strings.ToLower(strings.TrimSpace(d)) == domain {
			return true
		}
	}
	return false
}

func ShouldGrantTrialForEmail(register config.RegisterConfig, email string) bool {
	if !register.EnableTrial {
		return false
	}
	if !register.EnableTrialEmailWhitelist {
		return true
	}
	if register.TrialEmailDomainWhitelist == "" {
		return false
	}
	return IsEmailDomainWhitelisted(email, register.TrialEmailDomainWhitelist)
}