// This file is part of the happyDomain (R) project.
// Copyright (c) 2020-2026 happyDomain
// Authors: Pierre-Olivier Mercier, et al.
//
// This program is offered under a commercial and under the AGPL license.
// For commercial licensing, contact us at <contact@happydomain.org>.
//
// For AGPL licensing:
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package checker

import (
	"context"
	"fmt"
	"strings"

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

type ruleTCPReachable struct{}

func RuleTCPReachable() sdk.CheckRule { return &ruleTCPReachable{} }
func (ruleTCPReachable) Name() string { return "srv_tcp_reachable" }
func (ruleTCPReachable) Description() string {
	return "Every TCP SRV target:port accepts a TCP connection."
}
func (ruleTCPReachable) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
	d, cs := getData(ctx, obs)
	if cs != nil {
		return []sdk.CheckState{*cs}
	}
	total, ok, failed := countProbeResults(d, protoTCP)
	if total == 0 {
		return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_tcp_na",
			Message: "No TCP targets to test."}}
	}
	if ok == total {
		return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_tcp_ok",
			Message: fmt.Sprintf("All %d TCP target(s) reachable.", total)}}
	}
	if ok == 0 {
		return []sdk.CheckState{{Status: sdk.StatusCrit, Code: "srv_tcp_all_down",
			Message: fmt.Sprintf("All %d TCP target(s) unreachable: %s", total, strings.Join(failed, "; "))}}
	}
	return []sdk.CheckState{{Status: sdk.StatusWarn, Code: "srv_tcp_partial",
		Message: fmt.Sprintf("%d/%d TCP target(s) unreachable: %s", total-ok, total, strings.Join(failed, "; "))}}
}

type ruleUDPReachable struct{}

func RuleUDPReachable() sdk.CheckRule { return &ruleUDPReachable{} }
func (ruleUDPReachable) Name() string { return "srv_udp_reachable" }
func (ruleUDPReachable) Description() string {
	return "UDP SRV targets do not return ICMP port-unreachable."
}
func (ruleUDPReachable) Evaluate(ctx context.Context, obs sdk.ObservationGetter, _ sdk.CheckerOptions) []sdk.CheckState {
	d, cs := getData(ctx, obs)
	if cs != nil {
		return []sdk.CheckState{*cs}
	}
	total, ok, failed := countProbeResults(d, protoUDP)
	if total == 0 {
		return []sdk.CheckState{{Status: sdk.StatusUnknown, Code: "srv_udp_na",
			Message: "No UDP targets to test."}}
	}
	if ok == total {
		return []sdk.CheckState{{Status: sdk.StatusOK, Code: "srv_udp_ok",
			Message: fmt.Sprintf("All %d UDP target(s) reachable.", total)}}
	}
	return []sdk.CheckState{{Status: sdk.StatusWarn, Code: "srv_udp_issue",
		Message: fmt.Sprintf("%d/%d UDP target(s) reported port unreachable: %s", total-ok, total, strings.Join(failed, "; "))}}
}