package checker

import (
	"time"

	sdk "git.happydns.org/checker-sdk-go/checker"
)

// Version is the checker version reported in CheckerDefinition.Version.
var Version = "built-in"

// Definition returns the CheckerDefinition for the PTR checker.
func (p *ptrProvider) Definition() *sdk.CheckerDefinition {
	def := &sdk.CheckerDefinition{
		ID:      "ptr",
		Name:    "PTR / Reverse DNS",
		Version: Version,
		Availability: sdk.CheckerAvailability{
			ApplyToService:  true,
			LimitToServices: []string{"svcs.PTR"},
		},
		ObservationKeys: []sdk.ObservationKey{ObservationKeyPTR},
		Options: sdk.CheckerOptionsDocumentation{
			UserOpts: []sdk.CheckerOptionDocumentation{
				{
					Id:          "requireForwardMatch",
					Type:        "bool",
					Label:       "Require forward-confirmed reverse DNS (FCrDNS)",
					Description: "When enabled, a PTR whose target does not resolve back to the original IP is reported as critical (otherwise as warning). Mail servers and many SSH setups require FCrDNS.",
					Default:     true,
				},
				{
					Id:          "allowMultiplePTR",
					Type:        "bool",
					Label:       "Allow multiple PTR records on the same IP",
					Description: "When disabled, more than one PTR at the same owner name is reported as warning (RFC 1912 §2.1 recommends a single PTR per IP).",
					Default:     false,
				},
				{
					Id:          "minTTL",
					Type:        "uint",
					Label:       "Minimum PTR TTL (seconds)",
					Description: "PTR records with a TTL below this threshold are flagged as warning. Very short TTLs degrade resolver cache efficiency.",
					Default:     float64(300),
				},
				{
					Id:          "flagGenericPTR",
					Type:        "bool",
					Label:       "Flag generic-looking PTR hostnames",
					Description: "When enabled, PTR targets that embed the dotted IP or match common ISP auto-generated patterns are reported as warning.",
					Default:     true,
				},
			},
			ServiceOpts: []sdk.CheckerOptionDocumentation{
				{
					Id:       "service_type",
					Label:    "Service type",
					AutoFill: sdk.AutoFillServiceType,
				},
				{
					Id:       "service",
					Label:    "Service",
					AutoFill: sdk.AutoFillService,
				},
				{
					Id:       "domain_name",
					Label:    "Reverse zone",
					AutoFill: sdk.AutoFillDomainName,
				},
				{
					Id:       "subdomain",
					Label:    "PTR record",
					AutoFill: sdk.AutoFillSubdomain,
				},
			},
		},
		Rules:         Rules(),
		HasHTMLReport: true,
		Interval: &sdk.CheckIntervalSpec{
			Min:     5 * time.Minute,
			Max:     24 * time.Hour,
			Default: 1 * time.Hour,
		},
	}
	def.BuildRulesInfo()
	return def
}