package history

import (
	"encoding/json"
	"fmt"
	"time"

	"github.com/rs/zerolog/log"
	"gorm.io/gorm"
	"kumoly.io/kumoly/app/errors"
	"kumoly.io/kumoly/app/store"
)

var PROD = false

const (
	ERROR = "ERROR"
	INFO  = "INFO"
)

type History struct {
	ID        uint `gorm:"primaryKey"`
	CreatedAt time.Time
	Module    string
	Type      string
	Caller    string
	Trace     string

	Message string
	Body    interface{} `gorm:"-"`
	Issuer  string
	Group   string

	BodyJson string
}

func (h *History) BeforeCreate(tx *gorm.DB) (err error) {
	if h.Body != nil {
		body, err := json.Marshal(h.Body)
		if err != nil {
			h.BodyJson = string(body)
		}
	}
	return
}

var Tunnel chan *History
var quit chan struct{}
var started chan struct{}

func init() {
	Tunnel = make(chan *History)
	quit = make(chan struct{}, 1)
	started = make(chan struct{}, 1)
}

func Start(r Receiver) {
	select {
	case started <- struct{}{}:
	default:
		panic(errors.New(500, "history reporter has already started!"))
	}
	go func() {
		for {
			select {
			case h := <-Tunnel:
				if Interceptor != nil {
					go Interceptor(h)
				}
				r(h)
			case <-quit:
				<-started
				return
			}
		}
	}()
}

func Stop() {
	quit <- struct{}{}
}

func Send(h *History) {
	if h.Type == "" {
		h.Type = INFO
	}
	Tunnel <- h
}

type Receiver func(*History)

var Interceptor func(*History) = nil

var DBReceiver Receiver = func(h *History) {
	err := store.DB.Create(h).Error
	if err != nil {
		log.Error().Str("mod", "history").Err(err).Msg("DBReceiver error")
	}
}

var ConsoleReceiver Receiver = func(h *History) {
	fmt.Printf("%+v\n", h)
}