<template>
  <section class="container section hero is-fullheight">
    <div class="hero-body" v-if="event">
      <div class="container">
        <form @submit.prevent="joinEvent" v-if="!formSent">
          <p>
            {{
              $t(
                "This Mobilizon instance and this event organizer allows anonymous participations, but requires validation through email confirmation."
              )
            }}
          </p>
          <b-message type="is-info">
            {{
              $t(
                "Your email will only be used to confirm that you're a real person and send you eventual updates for this event. It will NOT be transmitted to other instances or to the event organizer."
              )
            }}
          </b-message>
          <b-message type="is-danger" v-if="error">{{ error }}</b-message>
          <b-field :label="$t('Email address')">
            <b-input
              type="email"
              v-model="anonymousParticipation.email"
              :placeholder="$t('Your email')"
              required
            ></b-input>
          </b-field>
          <p v-if="event.joinOptions === EventJoinOptions.RESTRICTED">
            {{
              $t(
                "The event organizer manually approves participations. Since you've chosen to participate without an account, please explain why you want to participate to this event."
              )
            }}
          </p>
          <p v-else>
            {{
              $t(
                "If you want, you may send a message to the event organizer here."
              )
            }}
          </p>
          <b-field :label="$t('Message')">
            <b-input
              type="textarea"
              v-model="anonymousParticipation.message"
              minlength="10"
              :required="event.joinOptions === EventJoinOptions.RESTRICTED"
            ></b-input>
          </b-field>
          <b-field>
            <b-checkbox v-model="anonymousParticipation.saveParticipation">
              <b>{{ $t("Remember my participation in this browser") }}</b>
              <p>
                {{
                  $t(
                    "Will allow to display and manage your participation status on the event page when using this device. Uncheck if you're using a public device."
                  )
                }}
              </p>
            </b-checkbox>
          </b-field>
          <b-button
            :disabled="sendingForm"
            type="is-primary"
            native-type="submit"
            >{{ $t("Send email") }}</b-button
          >
          <div class="has-text-centered">
            <b-button
              native-type="button"
              tag="a"
              type="is-text"
              @click="$router.go(-1)"
              >{{ $t("Back to previous page") }}</b-button
            >
          </div>
        </form>
        <div v-else>
          <h1 class="title">
            {{ $t("Request for participation confirmation sent") }}
          </h1>
          <p class="content">
            <span>{{
              $t("Check your inbox (and your junk mail folder).")
            }}</span>
            <span
              class="details"
              v-if="event.joinOptions === EventJoinOptions.RESTRICTED"
            >
              {{
                $t(
                  "Your participation will be validated once you click the confirmation link into the email, and after the organizer manually validates your participation."
                )
              }} </span
            ><span class="details" v-else>{{
              $t(
                "Your participation will be validated once you click the confirmation link into the email."
              )
            }}</span>
          </p>
          <b-message type="is-warning" v-if="error">{{ error }}</b-message>
          <p class="content">
            <i18n path="You may now close this window, or {return_to_event}.">
              <router-link
                slot="return_to_event"
                :to="{ name: RouteName.EVENT, params: { uuid: event.uuid } }"
                >{{ $t("return to the event's page") }}</router-link
              >
            </i18n>
          </p>
        </div>
      </div>
    </div>
    <b-message type="is-danger" v-else-if="!$apollo.loading"
      >{{
        $t(
          "Unable to load event for participation. The error details are provided below:"
        )
      }}
      <details>
        <pre>{{ error }}</pre>
      </details>
    </b-message>
  </section>
</template>
<script lang="ts">
import { Component, Prop, Vue } from "vue-property-decorator";
import { EventModel, IEvent } from "@/types/event.model";
import { FETCH_EVENT_BASIC, JOIN_EVENT } from "@/graphql/event";
import { IConfig } from "@/types/config.model";
import { CONFIG } from "@/graphql/config";
import { addLocalUnconfirmedAnonymousParticipation } from "@/services/AnonymousParticipationStorage";
import { EventJoinOptions, ParticipantRole } from "@/types/enums";
import RouteName from "@/router/name";
import { IParticipant } from "../../types/participant.model";
import { ApolloCache, FetchResult } from "@apollo/client/core";

@Component({
  apollo: {
    event: {
      query: FETCH_EVENT_BASIC,
      variables() {
        return {
          uuid: this.uuid,
        };
      },
      error(e) {
        this.error = e;
      },
      skip() {
        return !this.uuid;
      },
      update: (data) => new EventModel(data.event),
    },
    config: CONFIG,
  },
})
export default class ParticipationWithoutAccount extends Vue {
  @Prop({ type: String, required: true }) uuid!: string;

  anonymousParticipation: {
    email: string;
    message: string;
    saveParticipation: boolean;
  } = {
    email: "",
    message: "",
    saveParticipation: true,
  };

  event!: IEvent;

  config!: IConfig;

  error: string | boolean = false;

  formSent = false;

  sendingForm = false;

  EventJoinOptions = EventJoinOptions;

  RouteName = RouteName;

  async joinEvent(): Promise<void> {
    this.error = false;
    this.sendingForm = true;
    try {
      const { data } = await this.$apollo.mutate<{ joinEvent: IParticipant }>({
        mutation: JOIN_EVENT,
        variables: {
          eventId: this.event.id,
          actorId: this.config.anonymous.actorId,
          email: this.anonymousParticipation.email,
          message: this.anonymousParticipation.message,
          locale: this.$i18n.locale,
        },
        update: (
          store: ApolloCache<{ joinEvent: IParticipant }>,
          { data: updateData }: FetchResult
        ) => {
          if (updateData == null) {
            console.error(
              "Cannot update event participant cache, because of data null value."
            );
            return;
          }

          const cachedData = store.readQuery<{ event: IEvent }>({
            query: FETCH_EVENT_BASIC,
            variables: { uuid: this.event.uuid },
          });
          if (cachedData == null) {
            console.error(
              "Cannot update event participant cache, because of cached null value."
            );
            return;
          }
          const participantStats = { ...cachedData.event.participantStats };

          if (updateData.joinEvent.role === ParticipantRole.NOT_CONFIRMED) {
            participantStats.notConfirmed += 1;
          } else {
            participantStats.going += 1;
            participantStats.participant += 1;
          }

          store.writeQuery({
            query: FETCH_EVENT_BASIC,
            variables: { uuid: this.event.uuid },
            data: {
              event: {
                ...cachedData.event,
                participantStats,
              },
            },
          });
        },
      });
      this.formSent = true;
      if (
        data &&
        data.joinEvent.metadata.cancellationToken &&
        this.anonymousParticipation.saveParticipation
      ) {
        await addLocalUnconfirmedAnonymousParticipation(
          this.event,
          data.joinEvent.metadata.cancellationToken
        );
      }
    } catch (e) {
      if (
        ["TextEncoder is not defined", "crypto.subtle is undefined"].includes(
          e.message
        )
      ) {
        this.error = this.$t(
          "Unable to save your participation in this browser."
        ) as string;
      } else if (e.graphQLErrors && e.graphQLErrors.length > 0) {
        this.error = e.graphQLErrors[0].message;
      } else if (e.networkError) {
        this.error = e.networkError.message;
      }
    }
    this.sendingForm = false;
  }
}
</script>
<style lang="scss" scoped>
section.container.section {
  background: $white;
}
</style>
