package databag

import (
	"databag/internal/store"
	"errors"
	"github.com/gorilla/mux"
	"gorm.io/gorm"
	"net/http"
)

func SetChannelTopicSubject(w http.ResponseWriter, r *http.Request) {

	// scan parameters
	params := mux.Vars(r)
	topicID := params["topicID"]
	confirm := r.FormValue("confirm")

	var subject Subject
	if err := ParseRequest(r, w, &subject); err != nil {
		ErrResponse(w, http.StatusBadRequest, err)
		return
	}

	channelSlot, guid, err, code := getChannelSlot(r, true)
	if err != nil {
		ErrResponse(w, code, err)
		return
	}
	act := &channelSlot.Account

	// load topic
	var topicSlot store.TopicSlot
	if err = store.DB.Preload("Topic").Where("channel_id = ? AND topic_slot_id = ?", channelSlot.Channel.ID, topicID).First(&topicSlot).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			ErrResponse(w, http.StatusNotFound, err)
		} else {
			ErrResponse(w, http.StatusInternalServerError, err)
		}
		return
	}

	// can only update subject if creator
	if topicSlot.Topic.GUID != guid {
		ErrResponse(w, http.StatusUnauthorized, errors.New("topic not created by you"))
		return
	}

	err = store.DB.Transaction(func(tx *gorm.DB) error {

		if res := tx.Model(topicSlot.Topic).Update("data", subject.Data).Error; res != nil {
			return res
		}
		if res := tx.Model(topicSlot.Topic).Update("data_type", subject.DataType).Error; res != nil {
			return res
		}
		if confirm == "true" {
			if res := tx.Model(topicSlot.Topic).Update("status", APPTopicConfirmed).Error; res != nil {
				return res
			}
		}
		if confirm == "false" {
			if res := tx.Model(topicSlot.Topic).Update("status", APPTopicUnconfirmed).Error; res != nil {
				return res
			}
		}
		if res := tx.Model(&topicSlot.Topic).Update("detail_revision", act.ChannelRevision+1).Error; res != nil {
			return res
		}
		if res := tx.Model(&topicSlot).Update("revision", act.ChannelRevision+1).Error; res != nil {
			return res
		}
		if res := tx.Model(&channelSlot.Channel).Update("topic_revision", act.ChannelRevision+1).Error; res != nil {
			return res
		}
		if res := tx.Model(&channelSlot).Update("revision", act.ChannelRevision+1).Error; res != nil {
			return res
		}
		if res := tx.Model(act).Update("channel_revision", act.ChannelRevision+1).Error; res != nil {
			return res
		}
		return nil
	})
	if err != nil {
		ErrResponse(w, http.StatusInternalServerError, err)
		return
	}

	// determine affected contact list
	cards := make(map[string]store.Card)
	for _, card := range channelSlot.Channel.Cards {
		cards[card.GUID] = card
	}
	for _, group := range channelSlot.Channel.Groups {
		for _, card := range group.Cards {
			cards[card.GUID] = card
		}
	}

	SetStatus(act)
	for _, card := range cards {
		SetContactChannelNotification(act, &card)
	}
	WriteResponse(w, getTopicModel(&topicSlot))
}