<template>
  <QuickNav selected="Profile" />
  <!-- CONTENT -->
  <section id="Content" class="p-6 pb-24 max-w-3xl mx-auto">
    <div class="mb-2">
      <h1 class="text-2xl text-center font-light relative px-7">
        <!-- Back -->
        <a
          class="text-lg text-center font-light px-2 py-1 absolute -left-2 -top-1"
          @click="$router.back()"
        >
          <font-awesome icon="chevron-left" class="fa-fw" />
        </a>

        Your Contact Info
      </h1>
    </div>

    <p
      v-if="!givenName"
      class="bg-amber-200 rounded-md overflow-hidden text-center px-4 py-3 mb-4"
    >
      <span class="text-red">Beware!</span>
      You aren't sharing your name, so quickly
      <br />
      <span
        class="bg-gradient-to-b from-blue-400 to-blue-700 shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-1.5 py-1 rounded-md"
        @click="openUserNameDialog"
      >
        click here to set it for them.
      </span>
    </p>

    <UserNameDialog ref="userNameDialog" />

    <div
      v-if="activeDid && activeDid.startsWith(ETHR_DID_PREFIX)"
      class="text-center"
      @click="onCopyUrlToClipboard()"
    >
      <!--
        Play with display options: https://qr-code-styling.com/
        See docs: https://www.npmjs.com/package/qr-code-generator-vue3
      -->
      <QRCodeVue3
        :value="qrValue"
        :corners-square-options="{ type: 'extra-rounded' }"
        :dots-options="{ type: 'square' }"
        class="flex justify-center"
      />
      <span>
        Click the QR code to copy your contact info to your clipboard.
      </span>
    </div>
    <div v-else-if="activeDid" class="text-center">
      <!-- Not an ETHR DID so force them to paste it. (Passkey Peer DIDs are too big.) -->
      <span class="text-blue-500" @click="onCopyDidToClipboard()">
        Click here to copy your DID to your clipboard.
      </span>
      <span>
        Then give it to them so they can paste it in their list of People.
      </span>
    </div>
    <div v-else class="text-center">
      You have no identitifiers yet, so
      <router-link
        :to="{ name: 'start' }"
        class="bg-blue-500 text-white px-1.5 py-1 rounded-md"
      >
        create your identifier.
      </router-link>
      <br />
      If you don't that first, these contacts won't see your activity.
    </div>

    <div class="text-center">
      <h1 class="text-2xl text-center font-light pt-6">Scan Contact Info</h1>
      <div v-if="isScanning" class="relative aspect-square max-w-sm mx-auto">
        <!-- Status Message -->
        <div
          class="absolute top-0 left-0 right-0 bg-black bg-opacity-50 text-white text-center py-2 z-10"
        >
          <div
            v-if="isInitializing"
            class="flex items-center justify-center space-x-2"
          >
            <svg
              class="animate-spin h-5 w-5 text-white"
              xmlns="http://www.w3.org/2000/svg"
              fill="none"
              viewBox="0 0 24 24"
            >
              <circle
                class="opacity-25"
                cx="12"
                cy="12"
                r="10"
                stroke="currentColor"
                stroke-width="4"
              ></circle>
              <path
                class="opacity-75"
                fill="currentColor"
                d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
              ></path>
            </svg>
            <span>{{ initializationStatus }}</span>
          </div>
          <p
            v-else-if="isScanning"
            class="flex items-center justify-center space-x-2"
          >
            <span
              class="inline-block w-2 h-2 bg-green-500 rounded-full animate-pulse"
            ></span>
            <span>Position QR code in the frame</span>
          </p>
          <p v-else-if="error" class="text-red-300">
            <span class="font-medium">Error:</span> {{ error }}
          </p>
          <p v-else class="flex items-center justify-center space-x-2">
            <span
              class="inline-block w-2 h-2 bg-blue-500 rounded-full"
            ></span>
            <span>Ready to scan</span>
          </p>
        </div>

        <qrcode-stream
          v-if="useQRReader && !isNativePlatform"
          :camera="preferredCamera"
          @decode="onDecode"
          @init="onInit"
          @detect="onDetect"
          @error="onError"
          @camera-on="onCameraOn"
          @camera-off="onCameraOff"
        />

        <!-- Scanning Frame -->
        <div
          class="absolute inset-0 border-2"
          :class="{
            'border-blue-500': !error && !isScanning,
            'border-green-500 animate-pulse': isScanning,
            'border-red-500': error,
          }"
          style="opacity: 0.5; pointer-events: none"
        ></div>

        <!-- Debug Info -->
        <div
          class="absolute bottom-16 left-0 right-0 bg-black bg-opacity-50 text-white text-xs text-center py-1"
        >
          Camera: {{ preferredCamera === "user" ? "Front" : "Back" }} |
          Status: {{ cameraStatus }}
        </div>

        <!-- Camera Switch Button -->
        <button
          class="absolute bottom-4 right-4 bg-white rounded-full p-2 shadow-lg"
          title="Switch camera"
          @click="toggleCamera"
        >
          <svg
            class="h-6 w-6 text-gray-600"
            fill="none"
            viewBox="0 0 24 24"
            stroke="currentColor"
          >
            <path
              stroke-linecap="round"
              stroke-linejoin="round"
              stroke-width="2"
              d="M3 9a2 2 0 012-2h.93a2 2 0 001.664-.89l.812-1.22A2 2 0 0110.07 4h3.86a2 2 0 011.664.89l.812 1.22A2 2 0 0018.07 7H19a2 2 0 012 2v9a2 2 0 01-2 2H5a2 2 0 01-2-2V9z"
            />
            <path
              stroke-linecap="round"
              stroke-linejoin="round"
              stroke-width="2"
              d="M15 13a3 3 0 11-6 0 3 3 0 016 0z"
            />
          </svg>
        </button>
      </div>
      <div v-else>
        <button
          v-if="isNativePlatform"
          @click="$router.push({ name: 'contact-qr-scan' })"
          class="bg-blue-500 text-white px-4 py-2 rounded-md mt-4"
        >
          Start Scanning
        </button>
        <button
          v-else
          @click="startScanning"
          class="bg-blue-500 text-white px-4 py-2 rounded-md mt-4"
        >
          Start Scanning
        </button>
      </div>
      <span v-if="error" class="text-red-500 block mt-2">{{ error }}</span>
      <span v-else class="block mt-2">
        If you do not see a scanning camera window here, check your camera
        permissions.
      </span>
    </div>
  </section>
</template>

<script lang="ts">
import { AxiosError } from "axios";
import QRCodeVue3 from "qr-code-generator-vue3";
import { Component, Vue } from "vue-facing-decorator";
import { useClipboard } from "@vueuse/core";
import { Capacitor } from "@capacitor/core";
import { QrcodeStream } from "vue-qrcode-reader";

import QuickNav from "../components/QuickNav.vue";
import UserNameDialog from "../components/UserNameDialog.vue";
import { NotificationIface } from "../constants/app";
import { db, retrieveSettingsForActiveAccount } from "../db/index";
import { Contact } from "../db/tables/contacts";
import { MASTER_SETTINGS_KEY } from "../db/tables/settings";
import { getContactJwtFromJwtUrl } from "../libs/crypto";
import {
  generateEndorserJwtUrlForAccount,
  register,
  setVisibilityUtil,
} from "../libs/endorserServer";
import { decodeEndorserJwt, ETHR_DID_PREFIX } from "../libs/crypto/vc";
import { retrieveAccountMetadata } from "../libs/util";
import { Router } from "vue-router";
import { logger } from "../utils/logger";
import { QRScannerFactory } from "@/services/QRScanner/QRScannerFactory";
import { WebInlineQRScanner } from "@/services/QRScanner/WebInlineQRScanner";

interface QRScanResult {
  rawValue?: string;
  barcode?: string;
}

interface IUserNameDialog {
  open: (callback: (name: string) => void) => void;
}

@Component({
  components: {
    QRCodeVue3,
    QuickNav,
    UserNameDialog,
    QrcodeStream,
  },
})
export default class ContactQRScanShow extends Vue {
  $notify!: (notification: NotificationIface, timeout?: number) => void;
  $router!: Router;

  activeDid = "";
  apiServer = "";
  givenName = "";
  hideRegisterPromptOnNewContact = false;
  isRegistered = false;
  qrValue = "";
  isScanning = false;
  error: string | null = null;
  isNativePlatform = Capacitor.isNativePlatform();

  // QR Scanner properties
  isInitializing = true;
  initializationStatus = "Initializing camera...";
  useQRReader = __USE_QR_READER__;
  preferredCamera: "user" | "environment" = "environment";
  cameraStatus = "Initializing";

  ETHR_DID_PREFIX = ETHR_DID_PREFIX;

  // Add new properties to track scanning state
  private lastScannedValue: string = "";
  private lastScanTime: number = 0;
  private readonly SCAN_DEBOUNCE_MS = 2000; // Prevent duplicate scans within 2 seconds

  // Add cleanup tracking
  private isCleaningUp = false;
  private isMounted = false;

  async created() {
    try {
      const settings = await retrieveSettingsForActiveAccount();
      this.activeDid = settings.activeDid || "";
      this.apiServer = settings.apiServer || "";
      this.givenName = settings.firstName || "";
      this.hideRegisterPromptOnNewContact =
        !!settings.hideRegisterPromptOnNewContact;
      this.isRegistered = !!settings.isRegistered;

      const account = await retrieveAccountMetadata(this.activeDid);
      if (account) {
        const name =
          (settings.firstName || "") +
          (settings.lastName ? ` ${settings.lastName}` : "");
        this.qrValue = await generateEndorserJwtUrlForAccount(
          account,
          !!settings.isRegistered,
          name,
          settings.profileImageUrl || "",
          false,
        );
      }
    } catch (error) {
      logger.error("Error initializing component:", {
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      this.$notify({
        group: "alert",
        type: "danger",
        title: "Initialization Error",
        text: "Failed to initialize QR scanner. Please try again.",
      });
    }
  }

  async startScanning() {
    if (this.isCleaningUp) {
      logger.debug("Cannot start scanning during cleanup");
      return;
    }

    try {
      this.error = null;
      this.isScanning = true;
      this.isInitializing = true;
      this.initializationStatus = "Initializing camera...";
      this.lastScannedValue = "";
      this.lastScanTime = 0;

      const scanner = QRScannerFactory.getInstance();

      // Check if scanning is supported first
      if (!(await scanner.isSupported())) {
        this.error =
          "Camera access requires HTTPS. Please use a secure connection.";
        this.isScanning = false;
        this.isInitializing = false;
        this.$notify(
          {
            group: "alert",
            type: "warning",
            title: "HTTPS Required",
            text: "Camera access requires a secure (HTTPS) connection",
          },
          5000,
        );
        return;
      }

      // Check permissions first
      if (!(await scanner.checkPermissions())) {
        this.initializationStatus = "Requesting camera permission...";
        const granted = await scanner.requestPermissions();
        if (!granted) {
          this.error = "Camera permission denied";
          this.isScanning = false;
          this.isInitializing = false;
          // Show notification for better visibility
          this.$notify(
            {
              group: "alert",
              type: "warning",
              title: "Camera Access Required",
              text: "Camera permission denied",
            },
            5000,
          );
          return;
        }
      }

      // For native platforms, use the scanner service
      scanner.addListener({
        onScan: this.onScanDetect,
        onError: this.onScanError,
      });

      // Start scanning
      await scanner.startScan();
    } catch (error) {
      this.error = error instanceof Error ? error.message : String(error);
      this.isScanning = false;
      this.isInitializing = false;
      logger.error("Error starting scan:", {
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
    }
  }

  async stopScanning() {
    try {
      const scanner = QRScannerFactory.getInstance();
      await scanner.stopScan();
    } catch (error) {
      logger.error("Error stopping scan:", {
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
    } finally {
      this.isScanning = false;
      this.lastScannedValue = "";
      this.lastScanTime = 0;
    }
  }

  async cleanupScanner() {
    if (this.isCleaningUp) {
      return;
    }

    this.isCleaningUp = true;
    try {
      logger.info("Cleaning up QR scanner resources");
      await this.stopScanning();
      await QRScannerFactory.cleanup();
    } catch (error) {
      logger.error("Error during scanner cleanup:", {
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
    } finally {
      this.isCleaningUp = false;
    }
  }

  danger(message: string, title: string = "Error", timeout = 5000) {
    this.$notify(
      {
        group: "alert",
        type: "danger",
        title: title,
        text: message,
      },
      timeout,
    );
  }

  /**
   * Handle QR code scan result with debouncing to prevent duplicate scans
   */
  async onScanDetect(result: string | QRScanResult) {
    try {
      // Extract raw value from different possible formats
      const rawValue =
        typeof result === "string"
          ? result
          : result?.rawValue || result?.barcode;
      if (!rawValue) {
        logger.warn("Invalid scan result - no value found:", result);
        return;
      }

      // Debounce duplicate scans
      const now = Date.now();
      if (
        rawValue === this.lastScannedValue &&
        now - this.lastScanTime < this.SCAN_DEBOUNCE_MS
      ) {
        logger.info("Ignoring duplicate scan:", rawValue);
        return;
      }

      // Update scan tracking
      this.lastScannedValue = rawValue;
      this.lastScanTime = now;

      logger.info("Processing QR code scan result:", rawValue);

      // Extract JWT
      const jwt = getContactJwtFromJwtUrl(rawValue);
      if (!jwt) {
        logger.warn("Invalid QR code format - no JWT found in URL");
        this.$notify({
          group: "alert",
          type: "danger",
          title: "Invalid QR Code",
          text: "This QR code does not contain valid contact information. Please scan a TimeSafari contact QR code.",
        });
        return;
      }

      // Process JWT and contact info
      logger.info("Decoding JWT payload from QR code");
      const decodedJwt = await decodeEndorserJwt(jwt);
      if (!decodedJwt?.payload?.own) {
        logger.warn("Invalid JWT payload - missing 'own' field");
        this.$notify({
          group: "alert",
          type: "danger",
          title: "Invalid Contact Info",
          text: "The contact information is incomplete or invalid.",
        });
        return;
      }

      const contactInfo = decodedJwt.payload.own;
      if (!contactInfo.did) {
        logger.warn("Invalid contact info - missing DID");
        this.$notify({
          group: "alert",
          type: "danger",
          title: "Invalid Contact",
          text: "The contact DID is missing.",
        });
        return;
      }

      // Create contact object
      const contact = {
        did: contactInfo.did,
        name: contactInfo.name || "",
        email: contactInfo.email || "",
        phone: contactInfo.phone || "",
        company: contactInfo.company || "",
        title: contactInfo.title || "",
        notes: contactInfo.notes || "",
      };

      // Add contact and stop scanning
      logger.info("Adding new contact to database:", {
        did: contact.did,
        name: contact.name,
      });
      await this.addNewContact(contact);
      await this.stopScanning();
    } catch (error) {
      logger.error("Error processing contact QR code:", {
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      this.$notify({
        group: "alert",
        type: "danger",
        title: "Error",
        text:
          error instanceof Error
            ? error.message
            : "Could not process QR code. Please try again.",
      });
    }
  }

  async setVisibility(contact: Contact, visibility: boolean) {
    const result = await setVisibilityUtil(
      this.activeDid,
      this.apiServer,
      this.axios,
      db,
      contact,
      visibility,
    );
    if (result.error) {
      this.danger(result.error as string, "Error Setting Visibility");
    } else if (!result.success) {
      logger.warn("Unexpected result from setting visibility:", result);
    }
  }

  async register(contact: Contact) {
    logger.info("Submitting contact registration", {
      did: contact.did,
      name: contact.name,
    });
    this.$notify(
      {
        group: "alert",
        type: "toast",
        text: "",
        title: "Registration submitted...",
      },
      1000,
    );

    try {
      const regResult = await register(
        this.activeDid,
        this.apiServer,
        this.axios,
        contact,
      );
      if (regResult.success) {
        contact.registered = true;
        db.contacts.update(contact.did, { registered: true });
        logger.info("Contact registration successful", { did: contact.did });

        this.$notify(
          {
            group: "alert",
            type: "success",
            title: "Registration Success",
            text:
              (contact.name || "That unnamed person") + " has been registered.",
          },
          5000,
        );
      } else {
        this.$notify(
          {
            group: "alert",
            type: "danger",
            title: "Registration Error",
            text:
              (regResult.error as string) ||
              "Something went wrong during registration.",
          },
          5000,
        );
      }
    } catch (error) {
      logger.error("Error registering contact:", {
        did: contact.did,
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      let userMessage = "There was an error.";
      const serverError = error as AxiosError;
      if (serverError) {
        if (
          serverError.response?.data &&
          typeof serverError.response.data === "object" &&
          "message" in serverError.response.data
        ) {
          userMessage = (serverError.response.data as { message: string })
            .message;
        } else 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.$notify(
        {
          group: "alert",
          type: "danger",
          title: "Registration Error",
          text: userMessage,
        },
        5000,
      );
    }
  }

  onScanError(error: Error) {
    this.error = error.message;
    logger.error("QR code scan error:", {
      error: error.message,
      stack: error.stack,
    });
  }

  onCopyUrlToClipboard() {
    //this.onScanDetect([{ rawValue: this.qrValue }]); // good for testing
    useClipboard()
      .copy(this.qrValue)
      .then(() => {
        // console.log("Contact URL:", this.qrValue);
        this.$notify(
          {
            group: "alert",
            type: "toast",
            title: "Copied",
            text: "Contact URL was copied to clipboard.",
          },
          2000,
        );
      });
  }

  onCopyDidToClipboard() {
    //this.onScanDetect([{ rawValue: this.qrValue }]); // good for testing
    useClipboard()
      .copy(this.activeDid)
      .then(() => {
        this.$notify(
          {
            group: "alert",
            type: "info",
            title: "Copied",
            text: "Your DID was copied to the clipboard. Have them paste it in the box on their 'People' screen to add you.",
          },
          5000,
        );
      });
  }

  openUserNameDialog() {
    (this.$refs.userNameDialog as IUserNameDialog).open((name: string) => {
      this.givenName = name;
    });
  }

  // Lifecycle hooks
  mounted() {
    this.isMounted = true;
    document.addEventListener("pause", this.handleAppPause);
    document.addEventListener("resume", this.handleAppResume);
  }

  beforeDestroy() {
    this.isMounted = false;
    document.removeEventListener("pause", this.handleAppPause);
    document.removeEventListener("resume", this.handleAppResume);
    this.cleanupScanner();
  }

  async handleAppPause() {
    if (!this.isMounted) return;

    logger.info("App paused, stopping scanner");
    await this.stopScanning();
  }

  handleAppResume() {
    if (!this.isMounted) return;

    logger.info("App resumed, scanner can be restarted by user");
    this.isScanning = false;
  }

  async addNewContact(contact: Contact) {
    try {
      logger.info("Opening database connection for new contact");
      await db.open();

      // Check if contact already exists
      const existingContacts = await db.contacts.toArray();
      const existingContact = existingContacts.find(
        (c) => c.did === contact.did,
      );

      if (existingContact) {
        logger.info("Contact already exists", { did: contact.did });
        this.$notify(
          {
            group: "alert",
            type: "warning",
            title: "Contact Exists",
            text: "This contact has already been added to your list.",
          },
          3000,
        );
        return;
      }

      // Add new contact
      await db.contacts.add(contact);

      if (this.activeDid) {
        logger.info("Setting contact visibility", { did: contact.did });
        await this.setVisibility(contact, true);
        contact.seesMe = true;
      }

      this.$notify(
        {
          group: "alert",
          type: "success",
          title: "Contact Added",
          text: this.activeDid
            ? "They were added, and your activity is visible to them."
            : "They were added.",
        },
        3000,
      );

      if (
        this.isRegistered &&
        !this.hideRegisterPromptOnNewContact &&
        !contact.registered
      ) {
        setTimeout(() => {
          this.$notify(
            {
              group: "modal",
              type: "confirm",
              title: "Register",
              text: "Do you want to register them?",
              onCancel: async (stopAsking?: boolean) => {
                if (stopAsking) {
                  await db.settings.update(MASTER_SETTINGS_KEY, {
                    hideRegisterPromptOnNewContact: stopAsking,
                  });
                  this.hideRegisterPromptOnNewContact = stopAsking;
                }
              },
              onNo: async (stopAsking?: boolean) => {
                if (stopAsking) {
                  await db.settings.update(MASTER_SETTINGS_KEY, {
                    hideRegisterPromptOnNewContact: stopAsking,
                  });
                  this.hideRegisterPromptOnNewContact = stopAsking;
                }
              },
              onYes: async () => {
                await this.register(contact);
              },
              promptToStopAsking: true,
            },
            -1,
          );
        }, 500);
      }
    } catch (error) {
      logger.error("Error saving contact to database:", {
        did: contact.did,
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      this.$notify(
        {
          group: "alert",
          type: "danger",
          title: "Contact Error",
          text: "Could not save contact. Check if it already exists.",
        },
        5000,
      );
    }
  }

  async onInit(promise: Promise<void>): Promise<void> {
    logger.log("[QRScanner] onInit called");
    if (this.isNativePlatform) {
      logger.log("Skipping QR scanner initialization on native platform");
      return;
    }

    try {
      await promise;
      this.isInitializing = false;
      this.cameraStatus = "Ready";
    } catch (error) {
      const wrappedError = error instanceof Error ? error : new Error(String(error));
      this.error = wrappedError.message;
      this.cameraStatus = "Error";
      this.isInitializing = false;
      logger.error("Error during QR scanner initialization:", {
        error: wrappedError.message,
        stack: wrappedError.stack,
      });
    }
  }

  onCameraOn(): void {
    this.cameraStatus = "Active";
    this.isInitializing = false;
  }

  onCameraOff(): void {
    this.cameraStatus = "Off";
  }

  onDetect(result: any): void {
    this.isScanning = true;
    this.cameraStatus = "Detecting";
    try {
      let rawValue: string | undefined;
      if (Array.isArray(result) && result.length > 0 && "rawValue" in result[0]) {
        rawValue = result[0].rawValue;
      } else if (result && typeof result === "object" && "rawValue" in result) {
        rawValue = result.rawValue;
      }
      if (rawValue) {
        this.isInitializing = false;
        this.initializationStatus = "QR code captured!";
        this.onScanDetect(rawValue);
      }
    } catch (error) {
      this.handleError(error);
    } finally {
      this.isScanning = false;
      this.cameraStatus = "Active";
    }
  }

  onDecode(result: string): void {
    try {
      this.isInitializing = false;
      this.initializationStatus = "QR code captured!";
      this.onScanDetect(result);
    } catch (error) {
      this.handleError(error);
    }
  }

  toggleCamera(): void {
    this.preferredCamera = this.preferredCamera === "user" ? "environment" : "user";
  }

  private handleError(error: unknown): void {
    const wrappedError = error instanceof Error ? error : new Error(String(error));
    this.error = wrappedError.message;
    this.cameraStatus = "Error";
  }

  onError(error: Error): void {
    this.error = error.message;
    this.cameraStatus = "Error";
    logger.error("QR code scan error:", {
      error: error.message,
      stack: error.stack,
    });
  }
}
</script>

<style scoped>
.aspect-square {
  aspect-ratio: 1 / 1;
}
</style>
