// Copyright 2019 Drone.IO Inc. All rights reserved.
// Use of this source code is governed by the Drone Non-Commercial License
// that can be found in the LICENSE file.

package web

import (
	"net/http"
	"time"

	"github.com/drone/drone/core"
	"github.com/drone/go-scm/scm"
)

type varz struct {
	SCM     *scmInfo     `json:"scm"`
	License *licenseInfo `json:"license"`
}

type scmInfo struct {
	URL  string    `json:"url"`
	Rate *rateInfo `json:"rate"`
}

type rateInfo struct {
	Limit     int   `json:"limit"`
	Remaining int   `json:"remaining"`
	Reset     int64 `json:"reset"`
}

type licenseInfo struct {
	Kind       string    `json:"kind"`
	Seats      int64     `json:"seats"`
	SeatsUsed  int64     `json:"seats_used,omitempty"`
	SeatsAvail int64     `json:"seats_available,omitempty"`
	Repos      int64     `json:"repos"`
	ReposUsed  int64     `json:"repos_used,omitempty"`
	ReposAvail int64     `json:"repos_available,omitempty"`
	Expires    time.Time `json:"expire_at,omitempty"`
}

// HandleVarz creates an http.HandlerFunc that exposes internal system
// information.
func HandleVarz(client *scm.Client, license *core.License) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		rate := client.Rate()
		v := &varz{
			License: &licenseInfo{
				Kind:    license.Kind,
				Seats:   license.Users,
				Repos:   license.Repos,
				Expires: license.Expires,
			},
			SCM: &scmInfo{
				URL: client.BaseURL.String(),
				Rate: &rateInfo{
					Limit:     rate.Limit,
					Remaining: rate.Remaining,
					Reset:     rate.Reset,
				},
			},
		}
		writeJSON(w, v, 200)
	}
}