package application

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"sort"
	"strconv"
	"time"

	formvalidators "git.coopgo.io/coopgo-apps/parcoursmob/utils/form-validators"
	"git.coopgo.io/coopgo-apps/parcoursmob/utils/identification"
	"git.coopgo.io/coopgo-apps/parcoursmob/utils/sorting"
	agenda "git.coopgo.io/coopgo-platform/agenda/grpcapi"
	agendastorage "git.coopgo.io/coopgo-platform/agenda/storage"
	groupsmanagement "git.coopgo.io/coopgo-platform/groups-management/grpcapi"
	"git.coopgo.io/coopgo-platform/groups-management/storage"
	mobilityaccounts "git.coopgo.io/coopgo-platform/mobility-accounts/grpcapi"
	"github.com/gorilla/mux"
	"google.golang.org/protobuf/types/known/structpb"
	"google.golang.org/protobuf/types/known/timestamppb"
)

type EventsForm struct {
	Name           string     `json:"name" validate:"required"`
	Type           string     `json:"type" validate:"required"`
	Description    string     `json:"description"`
	Address        any        `json:"address,omitempty"`
	Allday         bool       `json:"allday"`
	Startdate      *time.Time `json:"startdate"`
	Enddate        *time.Time `json:"enddate"`
	Starttime      string     `json:"starttime"`
	Endtime        string     `json:"endtime"`
	MaxSubscribers int        `json:"max_subscribers"`
}

func (h *ApplicationHandler) AgendaHome(w http.ResponseWriter, r *http.Request) {
	resp, err := h.services.GRPC.Agenda.GetEvents(context.TODO(), &agenda.GetEventsRequest{
		Namespaces: []string{"parcoursmob_dispositifs"},
		Mindate:    timestamppb.New(time.Now().Add(-24 * time.Hour)),
	})

	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	responses := []agendastorage.Event{}

	groupids := []string{}
	for _, e := range resp.Events {
		groupids = append(groupids, e.Owners...)
		responses = append(responses, e.ToStorageType())
	}

	sort.Sort(sorting.EventsByStartdate(responses))

	groupsresp, err := h.services.GRPC.GroupsManagement.GetGroupsBatch(context.TODO(), &groupsmanagement.GetGroupsBatchRequest{
		Groupids: groupids,
	})
	groups := map[string]any{}

	if err == nil {
		for _, g := range groupsresp.Groups {
			groups[g.Id] = g.ToStorageType()
		}
	}
	h.Renderer.AgendaHome(w, r, responses, groups)
}

func (h *ApplicationHandler) AgendaCreateEvent(w http.ResponseWriter, r *http.Request) {
	if r.Method == "POST" {
		// Get current group
		g := r.Context().Value(identification.GroupKey)
		if g == nil {
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		group := g.(storage.Group)

		eventForm, err := parseEventsForm(r)
		if err != nil {
			fmt.Println(err)
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		data, _ := structpb.NewStruct(map[string]any{
			"address": eventForm.Address,
		})

		request := &agenda.CreateEventRequest{
			Event: &agenda.Event{
				Namespace:      "parcoursmob_dispositifs",
				Owners:         []string{group.ID},
				Type:           eventForm.Type,
				Name:           eventForm.Name,
				Description:    eventForm.Description,
				Startdate:      timestamppb.New(*eventForm.Startdate),
				Enddate:        timestamppb.New(*eventForm.Enddate),
				Starttime:      eventForm.Starttime,
				Endtime:        eventForm.Endtime,
				Allday:         eventForm.Allday,
				MaxSubscribers: int64(eventForm.MaxSubscribers),
				Data:           data,
			},
		}

		resp, err := h.services.GRPC.Agenda.CreateEvent(context.TODO(), request)

		if err != nil {
			fmt.Println(err)
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		http.Redirect(w, r, fmt.Sprintf("/app/agenda/%s", resp.Event.Id), http.StatusFound)

	}
	h.Renderer.AgendaCreateEvent(w, r)
}

func (h *ApplicationHandler) AgendaDisplayEvent(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	eventid := vars["eventid"]

	request := &agenda.GetEventRequest{
		Id: eventid,
	}

	resp, err := h.services.GRPC.Agenda.GetEvent(context.TODO(), request)
	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	grouprequest := &groupsmanagement.GetGroupRequest{
		Id: resp.Event.Owners[0],
	}

	groupresp, err := h.services.GRPC.GroupsManagement.GetGroup(context.TODO(), grouprequest)
	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	subscribers := map[string]any{}

	accids := []string{}
	for _, v := range resp.Event.Subscriptions {
		accids = append(accids, v.Subscriber)
	}

	subscriberresp, err := h.services.GRPC.MobilityAccounts.GetAccountsBatch(
		context.TODO(),
		&mobilityaccounts.GetAccountsBatchRequest{
			Accountids: accids,
		},
	)

	if err == nil {
		for _, sub := range subscriberresp.Accounts {
			subscribers[sub.Id] = sub.ToStorageType()
		}
	}

	g := r.Context().Value(identification.GroupKey)
	if g == nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	group := g.(storage.Group)

	accountids := []string{}
	for _, m := range group.Members {
		if !contains(resp.Event.Subscriptions, m) {
			accountids = append(accountids, m)
		}
	}

	accountresp, err := h.services.GRPC.MobilityAccounts.GetAccountsBatch(
		context.TODO(),
		&mobilityaccounts.GetAccountsBatchRequest{
			Accountids: accountids,
		},
	)

	accounts := []any{}

	if err == nil {
		for _, acc := range accountresp.Accounts {
			accounts = append(accounts, acc)
		}
	}

	h.Renderer.AgendaDisplayEvent(w, r, resp.Event.ToStorageType(), groupresp.Group.ToStorageType(), subscribers, accounts)
}

func (h *ApplicationHandler) AgendaSubscribeEvent(w http.ResponseWriter, r *http.Request) {
	current_group, err := h.currentGroup(r)
	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
	current_user_token, current_user_claims, err := h.currentUser(r)
	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
	vars := mux.Vars(r)
	eventid := vars["eventid"]

	if err := r.ParseForm(); err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusBadRequest)
		return
	}

	subscriber := r.FormValue("subscriber")
	data := map[string]any{
		"subscribed_by": map[string]any{
			"user": map[string]any{
				"id":           current_user_token.Subject,
				"display_name": current_user_claims["display_name"],
			},
			"group": map[string]any{
				"id":   current_group.ID,
				"name": current_group.Data["name"],
			},
		},
	}
	datapb, err := structpb.NewStruct(data)
	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	request := &agenda.SubscribeEventRequest{
		Eventid:    eventid,
		Subscriber: subscriber,
		Data:       datapb,
	}

	_, err = h.services.GRPC.Agenda.SubscribeEvent(context.TODO(), request)
	if err != nil {
		fmt.Println(err)
		w.WriteHeader(http.StatusInternalServerError)
		return
	}

	http.Redirect(w, r, fmt.Sprintf("/app/agenda/%s", eventid), http.StatusFound)
}

func parseEventsForm(r *http.Request) (*EventsForm, error) {
	if err := r.ParseForm(); err != nil {
		return nil, err
	}

	var startdate *time.Time
	var enddate *time.Time

	if r.PostFormValue("startdate") != "" {
		d, err := time.Parse("2006-01-02", r.PostFormValue("startdate"))
		if err != nil {
			return nil, err
		}
		startdate = &d
	}

	if r.PostFormValue("enddate") != "" {
		d, err := time.Parse("2006-01-02", r.PostFormValue("enddate"))
		if err != nil {
			return nil, err
		}
		enddate = &d
	}

	max_subscribers, err := strconv.Atoi(r.PostFormValue("max_subscribers"))
	if err != nil {
		return nil, err
	}

	formData := &EventsForm{
		Name:           r.PostFormValue("name"),
		Type:           r.PostFormValue("type"),
		Description:    r.PostFormValue("description"),
		Startdate:      startdate,
		Enddate:        enddate,
		Starttime:      r.PostFormValue("starttime"),
		Endtime:        r.PostFormValue("endtime"),
		MaxSubscribers: max_subscribers,
	}

	if r.PostFormValue("allday") == "true" {
		formData.Allday = true
	}

	if r.PostFormValue("address") != "" {
		var a any
		json.Unmarshal([]byte(r.PostFormValue("address")), &a)

		formData.Address = a
	}

	validate := formvalidators.New()
	if err := validate.Struct(formData); err != nil {
		return nil, err
	}

	return formData, nil
}

func contains(s []*agenda.Subscription, e string) bool {
	for _, a := range s {
		if a.Subscriber == e {
			return true
		}
	}
	return false
}

// func contains[V string](s []V, e V) bool {
// 	for _, a := range s {
// 		if a == e {
// 			return true
// 		}
// 	}
// 	return false
// }