package application

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"strings"
	"time"

	formvalidators "git.coopgo.io/coopgo-apps/parcoursmob/core/utils/form-validators"
	"github.com/gorilla/mux"
	"github.com/rs/zerolog/log"
)

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 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 (h *Handler) AgendaHomeHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		today := time.Now().Truncate(24 * time.Hour)
		result, err := h.applicationHandler.GetAgendaEvents(r.Context(), &today, nil)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving agenda events")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		h.renderer.AgendaHome(w, r, result.Events, result.Groups)
	}
}

func (h *Handler) AgendaHistoryHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		result, err := h.applicationHandler.GetAgendaEvents(r.Context(), nil, nil)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving agenda events")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		h.renderer.AgendaHistory(w, r, result.Events, result.Groups)
	}
}

func (h *Handler) AgendaCreateEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if r.Method == "POST" {
			// Parse form data
			eventForm, err := parseEventsForm(r)
			if err != nil {
				log.Error().Err(err).Msg("error parsing event form")
				http.Error(w, "Bad Request", http.StatusBadRequest)
				return
			}

			// Handle file upload if present
			var file io.Reader
			var filename string
			var fileSize int64
			var documentType, documentName string

			contentType := r.Header.Get("Content-Type")
			if strings.HasPrefix(contentType, "multipart/form-data") {
				err = r.ParseMultipartForm(100 * 1024 * 1024) // 100 MB limit
				if err != nil {
					log.Error().Err(err).Msg("error parsing multipart form")
					http.Error(w, "Bad Request", http.StatusBadRequest)
					return
				}

				uploadedFile, header, err := r.FormFile("file-upload")
				if err == nil {
					defer uploadedFile.Close()
					file = uploadedFile
					filename = header.Filename
					fileSize = header.Size
					documentType = r.FormValue("file_type")
					documentName = r.FormValue("file_name")
				} else if err != http.ErrMissingFile {
					log.Error().Err(err).Msg("error retrieving file")
					http.Error(w, "Bad Request", http.StatusBadRequest)
					return
				}
			}

			eventID, err := h.applicationHandler.CreateAgendaEvent(
				r.Context(),
				eventForm.Name,
				eventForm.Type,
				eventForm.Description,
				eventForm.Address,
				eventForm.Allday,
				eventForm.Startdate,
				eventForm.Enddate,
				eventForm.Starttime,
				eventForm.Endtime,
				eventForm.MaxSubscribers,
				file,
				filename,
				fileSize,
				documentType,
				documentName,
			)
			if err != nil {
				log.Error().Err(err).Msg("error creating agenda event")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

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

		// For GET requests, render the create event form with config data
		documentTypes := h.cfg.GetStringSlice("modules.agenda.documents_types")
		fileTypes := h.cfg.GetStringMapString("storage.files.file_types")
		h.renderer.AgendaCreateEvent(w, r, documentTypes, fileTypes, nil)
	}
}

func (h *Handler) AgendaDisplayEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]

		result, err := h.applicationHandler.GetAgendaEvent(r.Context(), eventID)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving agenda event")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		documentTypes := h.cfg.GetStringSlice("modules.agenda.documents_types")
		fileTypes := h.cfg.GetStringMapString("storage.files.file_types")
		h.renderer.AgendaDisplayEvent(w, r, result.Event, result.Group, documentTypes, fileTypes, result.Documents, result.Subscribers, result.Accounts)
	}
}

func (h *Handler) AgendaUpdateEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]

		if r.Method == "POST" {
			// Parse form data
			eventForm, err := parseEventsForm(r)
			if err != nil {
				log.Error().Err(err).Msg("error parsing event form")
				http.Error(w, "Bad Request", http.StatusBadRequest)
				return
			}

			updatedEventID, err := h.applicationHandler.UpdateAgendaEvent(
				r.Context(),
				eventID,
				eventForm.Name,
				eventForm.Type,
				eventForm.Description,
				eventForm.Address,
				eventForm.Allday,
				eventForm.Startdate,
				eventForm.Enddate,
				eventForm.Starttime,
				eventForm.Endtime,
				eventForm.MaxSubscribers,
			)
			if err != nil {
				log.Error().Err(err).Msg("error updating agenda event")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

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

		// For GET requests, render the update event form
		result, err := h.applicationHandler.GetAgendaEvent(r.Context(), eventID)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving agenda event")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		h.renderer.AgendaUpdateEvent(w, r, result.Event)
	}
}

func (h *Handler) AgendaDeleteEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]

		if r.Method == "POST" {
			if err := h.applicationHandler.DeleteAgendaEvent(r.Context(), eventID); err != nil {
				log.Error().Err(err).Msg("error deleting agenda event")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

			http.Redirect(w, r, "/app/agenda/", http.StatusFound)
			return
		}

		// For GET requests, render the delete confirmation form
		result, err := h.applicationHandler.GetAgendaEvent(r.Context(), eventID)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving agenda event")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		h.renderer.AgendaDeleteEvent(w, r, result.Event)
	}
}

func (h *Handler) AgendaSubscribeEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]

		if r.Method == "POST" {
			if err := r.ParseForm(); err != nil {
				log.Error().Err(err).Msg("error parsing form")
				http.Error(w, "Bad Request", http.StatusBadRequest)
				return
			}

			subscriber := r.FormValue("subscriber")

			// Get current user and group information
			current_group, err := h.currentGroup(r)
			if err != nil {
				log.Error().Err(err).Msg("error getting current group")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}
			current_user_token, current_user_claims, err := h.currentUser(r)
			if err != nil {
				log.Error().Err(err).Msg("error getting current user")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

			subscriptionData := map[string]any{
				"subscribed_by": map[string]any{
					"user": map[string]any{
						"id":           current_user_token.Subject,
						"display_name": current_user_claims["first_name"].(string) + " " + current_user_claims["last_name"].(string),
						"email":        current_user_claims["email"].(string),
					},
					"group": map[string]any{
						"id":   current_group.ID,
						"name": current_group.Data["name"],
					},
				},
			}

			if err := h.applicationHandler.SubscribeToAgendaEvent(r.Context(), eventID, subscriber, subscriptionData); err != nil {
				log.Error().Err(err).Msg("error subscribing to agenda event")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

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

		// For GET requests, redirect to event display
		http.Redirect(w, r, fmt.Sprintf("/app/agenda/%s", eventID), http.StatusFound)
	}
}

func (h *Handler) AgendaDeleteSubscribeEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]
		subscribeID := vars["subscribeid"]

		if r.Method == "POST" {
			if err := r.ParseForm(); err != nil {
				log.Error().Err(err).Msg("error parsing form")
				http.Error(w, "Bad Request", http.StatusBadRequest)
				return
			}

			motif := r.FormValue("motif")

			// Get current user and group information
			current_group, err := h.currentGroup(r)
			if err != nil {
				log.Error().Err(err).Msg("error getting current group")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}
			current_user_token, current_user_claims, err := h.currentUser(r)
			if err != nil {
				log.Error().Err(err).Msg("error getting current user")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

			if err := h.applicationHandler.UnsubscribeFromAgendaEvent(
				r.Context(),
				eventID,
				subscribeID,
				motif,
				current_user_token.Subject,
				current_user_claims["first_name"].(string)+" "+current_user_claims["last_name"].(string),
				current_user_claims["email"].(string),
				current_group.ID,
				current_group.Data["name"].(string),
			); err != nil {
				log.Error().Err(err).Msg("error unsubscribing from agenda event")
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

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

		// For GET requests, render the delete subscription form
		h.renderer.AgendaDeleteSubscribeEvent(w, r, eventID)
	}
}

func (h *Handler) AgendaHistoryEventHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]

		result, err := h.applicationHandler.GetAgendaEventHistory(r.Context(), eventID)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving agenda event history")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		h.renderer.AgendaHistoryEvent(w, r, result.Event, result.Group, result.Subscribers, result.Accounts)
	}
}

func (h *Handler) EventDocumentsHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]

		if err := r.ParseMultipartForm(100 * 1024 * 1024); err != nil { // 100 MB limit
			log.Error().Err(err).Msg("error parsing multipart form")
			http.Error(w, "Bad Request", http.StatusBadRequest)
			return
		}

		documentType := r.FormValue("type")
		documentName := r.FormValue("name")

		file, header, err := r.FormFile("file-upload")
		if err != nil {
			log.Error().Err(err).Msg("error retrieving file")
			http.Error(w, "Bad Request", http.StatusBadRequest)
			return
		}
		defer file.Close()

		if err := h.applicationHandler.AddEventDocument(r.Context(), eventID, file, header.Filename, header.Size, documentType, documentName); err != nil {
			log.Error().Err(err).Msg("error adding event document")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

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

func (h *Handler) EventDocumentDownloadHTTPHandler() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		eventID := vars["eventid"]
		document := vars["document"]

		file, info, err := h.applicationHandler.GetEventDocument(r.Context(), eventID, document)
		if err != nil {
			log.Error().Err(err).Msg("error retrieving event document")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Type", info.ContentType)
		if _, err = io.Copy(w, file); err != nil {
			log.Error().Err(err).Msg("error copying file content")
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

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