package handlers

import (
	"fmt"
	"github.com/gorilla/mux"
	"github.com/statping/statping/types/downtimes"
	"github.com/statping/statping/types/services"
	"github.com/statping/statping/utils"
	"net/http"
	"net/url"
	"time"
)

func findDowntime(r *http.Request) (*downtimes.Downtime, error) {
	vars := mux.Vars(r)
	id := utils.ToInt(vars["id"])
	downtime, err := downtimes.Find(id)
	if err != nil {
		return nil, err
	}

	return downtime, nil
}

func convertToMap(query url.Values) map[string]string {
	vars := make(map[string]string)
	if query.Get("start") != "" {
		vars["start"] = query.Get("start")
	}
	if query.Get("end") != "" {
		vars["end"] = query.Get("end")
	}
	if query.Get("sub_status") != "" {
		vars["sub_status"] = query.Get("sub_status")
	}
	if query.Get("service_id") != "" {
		vars["service_id"] = query.Get("service_id")
	}
	if query.Get("type") != "" {
		vars["type"] = query.Get("type")
	}
	if query.Get("skip") != "" {
		vars["skip"] = query.Get("skip")
	}
	if query.Get("count") != "" {
		vars["count"] = query.Get("count")
	}
	return vars
}

type DowntimeService struct {
	Id        int64             `gorm:"primary_key;column:id" json:"id"`
	Service   *services.Service `gorm:"foreignKey:service" json:"service"`
	ServiceId int64             `gorm:"index;column:service" json:"service_id"`
	SubStatus string            `gorm:"column:sub_status" json:"sub_status"`
	Failures  int               `gorm:"column:failures" json:"failures"`
	Start     *time.Time        `gorm:"index;column:start" json:"start"`
	End       *time.Time        `gorm:"column:end" json:"end"`
	Type      string            `gorm:"default:'auto';column:type" json:"type"`
}

func apiAllDowntimes(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query()
	vars := convertToMap(query)
	downtime, err := downtimes.FindAll(vars)
	var downtimeWithService []DowntimeService
	servicesMap := services.All()
	if downtime == nil {
		sendJsonAction(downtimeWithService, "fetch", w, r)
		return
	}
	for _, dtime := range *downtime {
		var downtimeWithServiceVar DowntimeService
		downtimeWithServiceVar.Id = dtime.Id
		downtimeWithServiceVar.ServiceId = dtime.ServiceId
		downtimeWithServiceVar.SubStatus = dtime.SubStatus
		downtimeWithServiceVar.Failures = dtime.Failures
		downtimeWithServiceVar.Start = dtime.Start
		downtimeWithServiceVar.End = dtime.End
		downtimeWithServiceVar.Type = dtime.Type
		downtimeWithServiceVar.Service = servicesMap[dtime.ServiceId]
		downtimeWithService = append(downtimeWithService, downtimeWithServiceVar)
	}
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}
	sendJsonAction(downtimeWithService, "fetch", w, r)
}

func apiAllDowntimesForServiceHandler(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	serviceId := utils.ToInt(vars["service_id"])
	ninetyDaysAgo := time.Now().Add(time.Duration(-90*24) * time.Hour)

	downtime, err := downtimes.FindByServiceAndDuration(serviceId, ninetyDaysAgo, time.Now())
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}
	sendJsonAction(downtime, "fetch", w, r)
}

func apiCreateDowntimeHandler(w http.ResponseWriter, r *http.Request) {
	var downtime *downtimes.Downtime
	if err := DecodeJSON(r, &downtime); err != nil {
		sendErrorJson(err, w, r)
		return
	}

	if downtime.CheckOverlapping() {
		err := fmt.Errorf("downtime interval overlapping error")
		sendErrorJson(err, w, r)
		return
	}

	s, err := services.FindFirstFromDB(downtime.ServiceId)
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}

	downtime.Type = "manual"
	downtime.Id = zeroInt64

	if err := downtime.Create(); err != nil {
		sendErrorJson(err, w, r)
		return
	}

	if downtime.End == nil {
		updateFields := map[string]interface{}{
			"online":           false,
			"current_downtime": downtime.Id,
			"manual_downtime":  true,
		}

		if err := s.UpdateSpecificFields(updateFields); err != nil {
			sendErrorJson(err, w, r)
			return
		}
	}

	sendJsonAction(downtime, "create", w, r)
}

func apiDowntimeHandler(w http.ResponseWriter, r *http.Request) {
	downtime, err := findDowntime(r)
	if downtime == nil {
		sendErrorJson(err, w, r)
		return
	}
	sendJsonAction(downtime, "fetch", w, r)
}

func apiPatchDowntimeHandler(w http.ResponseWriter, r *http.Request) {
	downtime, err := findDowntime(r)
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}
	var req downtimes.Downtime
	if err := DecodeJSON(r, &req); err != nil {
		sendErrorJson(err, w, r)
		return
	}

	s, err := services.FindFirstFromDB(downtime.ServiceId)
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}

	if downtime.End != nil && req.End == nil {
		fmt.Errorf("Cannot reopen a downtime!")
	}

	if downtime.End == nil && req.End != nil {
		updateFields := map[string]interface{}{
			"online":           true,
			"failure_counter":  0,
			"current_downtime": 0,
			"manual_downtime":  false,
		}

		if err := s.UpdateSpecificFields(updateFields); err != nil {
			sendErrorJson(err, w, r)
			return
		}
	}

	downtime.Start = req.Start
	downtime.End = req.End
	downtime.Type = "manual"
	downtime.Failures = req.Failures
	downtime.SubStatus = req.SubStatus

	if err := downtime.Update(); err != nil {
		sendErrorJson(err, w, r)
		return
	}

	sendJsonAction(downtime, "update", w, r)
}

func apiDeleteDowntimeHandler(w http.ResponseWriter, r *http.Request) {
	downtime, err := findDowntime(r)
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}
	if downtime.End == nil {
		s2, err := services.FindFirstFromDB(downtime.ServiceId)
		if err != nil {
			fmt.Errorf("Error updating service")
		}
		s2.LastProcessingTime = zeroTime
		s2.Online = true
		s2.FailureCounter = 0
		s2.CurrentDowntime = 0
		s2.ManualDowntime = false

		if err := s2.Update(); err != nil {
			sendErrorJson(err, w, r)
			return
		}
	}

	err = downtime.Delete()
	if err != nil {
		sendErrorJson(err, w, r)
		return
	}

	sendJsonAction(downtime, "delete", w, r)
}