/*
Copyright 2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// Package health implements Health checks
package health

import (
	"fmt"
)

type Info struct {
	Healthy  bool
	Source   string
	MoreInfo map[string]string
}

type Aware interface {
	Healthy() (*Info, error)
}

type Handler struct {
	version     string
	healthAware []Aware
}

type Result struct {
	Healthy bool
	Version string
	Info    []*Info
}

func (h *Handler) CheckHealth() (*Result, error) {
	healthInfo := make([]*Info, len(h.healthAware))

	healthy := true

	for idx, aware := range h.healthAware {
		info, err := aware.Healthy()
		if err != nil {
			return nil, fmt.Errorf("health check failed: %w", err)
		}

		healthInfo[idx] = info
		healthy = healthy && info.Healthy
	}

	return &Result{Healthy: healthy, Version: h.version, Info: healthInfo}, nil
}

func New(version string, healthAware ...Aware) *Handler {
	return &Handler{version: version, healthAware: healthAware}
}