<template>
  <!-- QUICK NAV -->
  <nav id="QuickNav" class="fixed bottom-0 left-0 right-0 bg-slate-200">
    <ul class="flex text-2xl p-2 gap-2">
      <!-- Home Feed -->
      <li class="basis-1/5 rounded-md text-slate-500">
        <router-link :to="{ name: 'home' }" class="block text-center py-3 px-1"
          ><fa icon="house-chimney" class="fa-fw"></fa
        ></router-link>
      </li>
      <!-- Search -->
      <li class="basis-1/5 rounded-md bg-slate-400 text-white">
        <router-link
          :to="{ name: 'discover' }"
          class="block text-center py-3 px-1"
          ><fa icon="magnifying-glass" class="fa-fw"></fa
        ></router-link>
      </li>
      <!-- Contacts -->
      <li class="basis-1/5 rounded-md text-slate-500">
        <router-link
          :to="{ name: 'projects' }"
          class="block text-center py-3 px-1"
          ><fa icon="folder-open" class="fa-fw"></fa
        ></router-link>
      </li>
      <!-- Contacts -->
      <li class="basis-1/5 rounded-md text-slate-500">
        <router-link
          :to="{ name: 'contacts' }"
          class="block text-center py-3 px-1"
          ><fa icon="users" class="fa-fw"></fa
        ></router-link>
      </li>
      <!-- Profile -->
      <li class="basis-1/5 rounded-md text-slate-500">
        <router-link
          :to="{ name: 'account' }"
          class="block text-center py-3 px-1"
          ><fa icon="circle-user" class="fa-fw"></fa
        ></router-link>
      </li>
    </ul>
  </nav>

  <section id="Content" class="p-6 pb-24">
    <!-- Heading -->
    <h1 id="ViewHeading" class="text-4xl text-center font-light pt-4 mb-8">
      My Contacts
    </h1>

    <!-- New Contact -->
    <div class="mb-4 flex">
      <input
        type="text"
        placeholder="DID, Name, Public Key"
        class="block w-full rounded-l border border-r-0 border-slate-400 px-3 py-2"
        v-model="contactInput"
      />
      <button
        class="px-4 rounded-r bg-slate-200 border border-l-0 border-slate-400"
        @click="onClickNewContact()"
      >
        <fa icon="plus" class="fa-fw"></fa>
      </button>
    </div>

    <div class="flex justify-between" v-if="showGiveTotals">
      <div class="w-full text-right">
        Hours to Add:
        <input
          class="border border rounded border-slate-400 w-24 text-right"
          type="text"
          placeholder="1"
          v-model="hourInput"
        />
        <br />
        <input
          class="border border rounded border-slate-400 w-48"
          type="text"
          placeholder="Description"
          v-model="hourDescriptionInput"
        />
      </div>
    </div>

    <!-- Results List -->
    <ul class="">
      <li
        class="border-b border-slate-300"
        v-for="contact in contacts"
        :key="contact.did"
      >
        <div class="grow overflow-hidden">
          <h2 class="text-base font-semibold">
            {{ contact.name || "(no name)" }}
          </h2>
          <div class="text-sm truncate">{{ contact.did }}</div>
          <div class="text-sm truncate" v-if="contact.publicKeyBase64">
            Public Key (base 64): {{ contact.publicKeyBase64 }}
          </div>
          <button @click="deleteContact(contact)">
            <fa icon="trash-can" class="text-slate-900 fa-fw ml-1" />
          </button>
          <div v-if="showGiveTotals" class="float-right">
            <div class="float-right">
              to: {{ givenByMeTotals[contact.did] || 0 }}
              <button
                class="text-md uppercase bg-slate-500 text-white px-1.5 py-2 rounded-md mb-6"
                @click="onClickAddGive(identity.did, contact.did)"
              >
                +
              </button>
              by: {{ givenToMeTotals[contact.did] || 0 }}
              <button
                class="text-md uppercase bg-slate-500 text-white px-1.5 py-2 rounded-md mb-6"
                @click="onClickAddGive(contact.did, identity.did)"
              >
                +
              </button>
            </div>
          </div>
        </div>
      </li>
    </ul>
  </section>
  <div v-bind:class="computedAlertClassNames()">
    <button
      class="close-button bg-slate-200 w-8 leading-loose rounded-full absolute top-2 right-2"
      @click="onClickClose()"
    >
      <fa icon="xmark"></fa>
    </button>
    <h4 class="font-bold pr-5">{{ alertTitle }}</h4>
    <p>{{ alertMessage }}</p>
  </div>
</template>

<script lang="ts">
import { AxiosError } from "axios";
import * as didJwt from "did-jwt";
import * as R from "ramda";
import { IIdentifier } from "@veramo/core";
import { Options, Vue } from "vue-class-component";

import { AppString } from "@/constants/app";
import { accessToken, SimpleSigner } from "@/libs/crypto";
import { accountsDB, db } from "@/db";
import { Contact } from "@/db/tables/contacts";
import { MASTER_SETTINGS_KEY } from "@/db/tables/settings";

// eslint-disable-next-line @typescript-eslint/no-var-requires
const Buffer = require("buffer/").Buffer;

export interface GiveVerifiableCredential {
  "@context": string;
  "@type": string;
  agent: { identifier: string };
  description?: string;
  object: { amountOfThisGood: number; unitCode: string };
  recipient: { identifier: string };
}

@Options({
  components: {},
})
export default class ContactsView extends Vue {
  contacts: Array<Contact> = [];
  contactInput = "";
  // { "did:...": amount } entry for each contact
  givenByMeTotals: Record<string, number> = {};
  // { "did:...": amount } entry for each contact
  givenToMeTotals: Record<string, number> = {};
  hourDescriptionInput = "";
  hourInput = "0";
  identity: IIdentifier | null = null;
  showGiveTotals = false;

  // 'created' hook runs when the Vue instance is first created
  async created() {
    await accountsDB.open();
    const accounts = await accountsDB.accounts.toArray();
    this.identity = JSON.parse(accounts[0].identity);

    await db.open();
    const settings = await db.settings.get(MASTER_SETTINGS_KEY);
    this.showGiveTotals = !!settings?.showContactGivesInline;
    if (this.showGiveTotals) {
      this.loadGives();
    }
    const allContacts = await db.contacts.toArray();
    this.contacts = R.sort(
      (a: Contact, b) => (a.name || "").localeCompare(b.name || ""),
      allContacts
    );
  }

  async onClickNewContact(): Promise<void> {
    let did = this.contactInput;
    let name, publicKeyBase64;
    const commaPos1 = this.contactInput.indexOf(",");
    if (commaPos1 > -1) {
      did = this.contactInput.substring(0, commaPos1).trim();
      name = this.contactInput.substring(commaPos1 + 1).trim();
      const commaPos2 = this.contactInput.indexOf(",", commaPos1 + 1);
      if (commaPos2 > -1) {
        name = this.contactInput.substring(commaPos1 + 1, commaPos2).trim();
        publicKeyBase64 = this.contactInput.substring(commaPos2 + 1).trim();
      }
    }
    // help with potential mistakes while this sharing requires copy-and-paste
    if (publicKeyBase64 && /^[0-9A-Fa-f]{66}$/i.test(publicKeyBase64)) {
      // it must be all hex (compressed public key), so convert
      publicKeyBase64 = Buffer.from(publicKeyBase64, "hex").toString("base64");
    }
    const newContact = { did, name, publicKeyBase64 };
    await db.contacts.add(newContact);
    const allContacts = this.contacts.concat([newContact]);
    this.contacts = R.sort(
      (a: Contact, b) => (a.name || "").localeCompare(b.name || ""),
      allContacts
    );
  }

  async loadGives() {
    if (!this.identity) {
      console.error(
        "Attempted to load Give records with no identity available."
      );
      return;
    }

    const endorserApiServer = AppString.DEFAULT_ENDORSER_API_SERVER;

    // load all the time I have given
    try {
      const url =
        endorserApiServer +
        "/api/v2/report/gives?agentId=" +
        encodeURIComponent(this.identity?.did);
      const token = await accessToken(this.identity);
      const headers = {
        "Content-Type": "application/json",
        Authorization: "Bearer " + token,
      };
      const resp = await this.axios.get(url, { headers });
      //console.log("Server response", resp.status, resp.data);
      if (resp.status === 200) {
        const contactTotals: Record<string, number> = {};
        for (const give of resp.data.data) {
          if (give.unit == "HUR") {
            const recipDid: string = give.recipientDid;
            const prevAmount = contactTotals[recipDid] || 0;
            contactTotals[recipDid] = prevAmount + give.amount;
          }
        }
        //console.log("Done retrieving gives", contactTotals);
        this.givenByMeTotals = contactTotals;
      }
    } catch (error) {
      this.alertTitle = "Error from Server";
      this.alertMessage = error as string;
      this.isAlertVisible = true;
    }

    // load all the time I have received
    try {
      const url =
        endorserApiServer +
        "/api/v2/report/gives?recipientId=" +
        encodeURIComponent(this.identity.did);
      const token = await accessToken(this.identity);
      const headers = {
        "Content-Type": "application/json",
        Authorization: "Bearer " + token,
      };
      const resp = await this.axios.get(url, { headers });
      //console.log("Server response", resp.status, resp.data);
      if (resp.status === 200) {
        const contactTotals: Record<string, number> = {};
        for (const give of resp.data.data) {
          if (give.unit == "HUR") {
            const prevAmount = contactTotals[give.agentDid] || 0;
            contactTotals[give.agentDid] = prevAmount + give.amount;
          }
        }
        //console.log("Done retrieving receipts", contactTotals);
        this.givenToMeTotals = contactTotals;
      }
    } catch (error) {
      this.alertTitle = "Error from Server";
      this.alertMessage = error as string;
      this.isAlertVisible = true;
    }
  }

  async deleteContact(contact: Contact) {
    if (
      confirm(
        "Are you sure you want to delete " +
          this.nameForDid(this.contacts, contact.did) +
          " with DID " +
          contact.did +
          "?"
      )
    ) {
      await db.open();
      await db.contacts.delete(contact.did);
      this.contacts = R.without([contact], this.contacts);
    }
  }

  // from https://stackoverflow.com/a/175787/845494
  //
  private isNumeric(str: string): boolean {
    return !isNaN(+str);
  }

  private nameForDid(contacts: Array<Contact>, did: string): string {
    const contact = R.find((con) => con.did == did, contacts);
    return contact?.name || "this unnamed user";
  }

  async onClickAddGive(fromDid: string, toDid: string): Promise<void> {
    if (!this.isNumeric(this.hourInput)) {
      this.alertTitle = "Input Error";
      this.alertMessage =
        "This is not a valid number of hours: " + this.hourInput;
      this.isAlertVisible = true;
    } else if (!parseFloat(this.hourInput)) {
      this.alertTitle = "Input Error";
      this.alertMessage = "Giving 0 hours does nothing.";
      this.isAlertVisible = true;
    } else if (!this.identity) {
      this.alertTitle = "Status Error";
      this.alertMessage = "No identity is available.";
      this.isAlertVisible = true;
    } else {
      let toFrom;
      if (fromDid == this.identity?.did) {
        toFrom = "from you to " + this.nameForDid(this.contacts, toDid);
      } else {
        toFrom = "from " + this.nameForDid(this.contacts, fromDid) + " to you";
      }
      if (
        confirm(
          "Are you sure you want to record " +
            this.hourInput +
            " hours " +
            toFrom +
            "?"
        )
      ) {
        this.createAndSubmitGive(
          this.identity,
          fromDid,
          toDid,
          parseFloat(this.hourInput),
          this.hourDescriptionInput
        );
      }
    }
  }

  private async createAndSubmitGive(
    identity: IIdentifier,
    fromDid: string,
    toDid: string,
    amount: number,
    description: string
  ): Promise<void> {
    // Make a claim
    const vcClaim: GiveVerifiableCredential = {
      "@context": "https://schema.org",
      "@type": "GiveAction",
      agent: { identifier: fromDid },
      object: { amountOfThisGood: amount, unitCode: "HUR" },
      recipient: { identifier: toDid },
    };
    if (description) {
      vcClaim.description = description;
    }
    // Make a payload for the claim
    const vcPayload = {
      vc: {
        "@context": ["https://www.w3.org/2018/credentials/v1"],
        type: ["VerifiableCredential"],
        credentialSubject: vcClaim,
      },
    };
    // Create a signature using private key of identity
    if (identity.keys[0].privateKeyHex !== null) {
      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
      const privateKeyHex: string = identity.keys[0].privateKeyHex!;
      const signer = await SimpleSigner(privateKeyHex);
      const alg = undefined;
      // Create a JWT for the request
      const vcJwt: string = await didJwt.createJWT(vcPayload, {
        alg: alg,
        issuer: identity.did,
        signer: signer,
      });

      // Make the xhr request payload

      const payload = JSON.stringify({ jwtEncoded: vcJwt });
      const endorserApiServer = AppString.DEFAULT_ENDORSER_API_SERVER;
      const url = endorserApiServer + "/api/v2/claim";
      const token = await accessToken(identity);
      const headers = {
        "Content-Type": "application/json",
        Authorization: "Bearer " + token,
      };

      try {
        const resp = await this.axios.post(url, payload, { headers });
        //console.log("Got resp data:", resp.data);
        if (resp.data?.success?.handleId) {
          this.alertTitle = "";
          this.alertMessage = "";
          if (fromDid === identity.did) {
            this.givenByMeTotals[toDid] = this.givenByMeTotals[toDid] + amount;
            // do this to update the UI (is there a better way?)
            // eslint-disable-next-line no-self-assign
            this.givenByMeTotals = this.givenByMeTotals;
          } else {
            this.givenToMeTotals[fromDid] =
              this.givenToMeTotals[fromDid] + amount;
            // do this to update the UI (is there a better way?)
            // eslint-disable-next-line no-self-assign
            this.givenToMeTotals = this.givenToMeTotals;
          }
        }
      } catch (error) {
        let userMessage = "There was an error. See logs for more info.";
        const serverError = error as AxiosError;
        if (serverError) {
          if (serverError.message) {
            userMessage = serverError.message; // Info for the user
          } else {
            userMessage = JSON.stringify(serverError.toJSON());
          }
        } else {
          userMessage = error as string;
        }
        // Now set that error for the user to see.
        this.alertTitle = "Error with Server";
        this.alertMessage = userMessage;
        this.isAlertVisible = true;
      }
    }
  }

  alertTitle = "";
  alertMessage = "";
  isAlertVisible = false;

  public onClickClose() {
    this.isAlertVisible = false;
    this.alertTitle = "";
    this.alertMessage = "";
  }

  public computedAlertClassNames() {
    return {
      hidden: !this.isAlertVisible,
      "dismissable-alert": true,
      "bg-slate-100": true,
      "p-5": true,
      rounded: true,
      "drop-shadow-lg": true,
      absolute: true,
      "top-3": true,
      "inset-x-3": true,
      "transition-transform": true,
      "ease-in": true,
      "duration-300": true,
    };
  }
}
</script>
