milinda-pitch/js/components/search-bar.js

/**
 * Search Bar Component
 * Search input with mic and search icons on the right
 * Includes speech recognition functionality
 */
import { micIcon } from "../icons/mic.js";
import { searchIcon } from "../icons/search.js";

class SearchBar extends HTMLElement {
  constructor() {
    super();
    this.attachShadow({ mode: "open" });
    this.recognition = null;
    this.isListening = false;
  }

  connectedCallback() {
    this.render();
    this.addEventListeners();
    this.initSpeechRecognition();
  }

  disconnectedCallback() {
    if (this.recognition) {
      this.recognition.stop();
    }
  }

  initSpeechRecognition() {
    // Check for browser support
    const SpeechRecognition =
      window.SpeechRecognition || window.webkitSpeechRecognition;

    if (!SpeechRecognition) {
      console.warn("Speech recognition is not supported in this browser");
      const micButton = this.shadowRoot.querySelector(".mic-button");
      if (micButton) {
        micButton.style.display = "none";
      }
      return;
    }

    this.recognition = new SpeechRecognition();
    this.recognition.continuous = false;
    this.recognition.interimResults = true;
    this.recognition.lang = "nl-NL";

    this.recognition.onstart = () => {
      this.isListening = true;
      this.updateMicButtonState();
    };

    this.recognition.onend = () => {
      this.isListening = false;
      this.updateMicButtonState();
    };

    this.recognition.onresult = (event) => {
      const input = this.shadowRoot.querySelector(".search-input");
      const transcript = Array.from(event.results)
        .map((result) => result[0].transcript)
        .join("");

      input.value = transcript;

      // Dispatch input event for live updates
      this.dispatchEvent(
        new CustomEvent("search-input", {
          detail: { query: transcript },
          bubbles: true,
          composed: true,
        })
      );

      // If final result, also dispatch search event
      if (event.results[0].isFinal) {
        this.dispatchEvent(
          new CustomEvent("search", {
            detail: { query: transcript },
            bubbles: true,
            composed: true,
          })
        );
      }
    };

    this.recognition.onerror = (event) => {
      console.error("Speech recognition error:", event.error);
      this.isListening = false;
      this.updateMicButtonState();
    };
  }

  updateMicButtonState() {
    const micButton = this.shadowRoot.querySelector(".mic-button");
    if (micButton) {
      micButton.classList.toggle("listening", this.isListening);
      micButton.setAttribute("aria-pressed", this.isListening.toString());
    }
  }

  toggleSpeechRecognition() {
    if (!this.recognition) return;

    if (this.isListening) {
      this.recognition.stop();
    } else {
      this.recognition.start();
    }
  }

  addEventListeners() {
    const input = this.shadowRoot.querySelector(".search-input");
    const form = this.shadowRoot.querySelector(".search-form");
    const micButton = this.shadowRoot.querySelector(".mic-button");
    const searchButton = this.shadowRoot.querySelector(".search-button");

    form.addEventListener("submit", (e) => {
      e.preventDefault();
      this.dispatchEvent(
        new CustomEvent("search", {
          detail: { query: input.value },
          bubbles: true,
          composed: true,
        })
      );
    });

    input.addEventListener("input", (e) => {
      this.dispatchEvent(
        new CustomEvent("search-input", {
          detail: { query: e.target.value },
          bubbles: true,
          composed: true,
        })
      );
    });

    micButton.addEventListener("click", () => {
      this.toggleSpeechRecognition();
    });

    searchButton.addEventListener("click", () => {
      this.dispatchEvent(
        new CustomEvent("search", {
          detail: { query: input.value },
          bubbles: true,
          composed: true,
        })
      );
    });
  }

  render() {
    const iconColor = "#951D51";

    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
        }

        .search-form {
          display: flex;
          align-items: center;
          height: 50px;
          padding: 8px 16px;
          background-color: #951D51;
        }

        .search-container {
          display: flex;
          align-items: center;
          width: 100%;
          height: 40px;
          background-color: #FFF;
          border-radius: 8px;
          overflow: hidden;
        }

        .search-input {
          flex: 1;
          height: 100%;
          padding: 0 16px;
          font-family: var(--font-family-base);
          font-size: var(--font-size-base, 16px);
          font-weight: var(--font-weight-light, 300);
          color: #383838;
          background-color: transparent;
          border: none;
          outline: none;
        }

        .search-input::placeholder {
          font-family: var(--font-family-base);
          font-size: var(--font-size-base, 16px);
          font-weight: var(--font-weight-light, 300);
          color: rgba(56, 56, 56, 0.5);
        }

        .icon-buttons {
          display: flex;
          align-items: center;
          gap: 4px;
          padding-right: 8px;
        }

        .icon-button {
          display: flex;
          align-items: center;
          justify-content: center;
          width: 32px;
          height: 32px;
          background: transparent;
          border: none;
          cursor: pointer;
          padding: 0;
          border-radius: 4px;
          transition: background-color 150ms ease;
        }

        .icon-button:hover {
          background-color: rgba(149, 29, 81, 0.1);
        }

        .icon-button:active {
          background-color: rgba(149, 29, 81, 0.2);
        }

        .icon-button.listening {
          background-color: rgba(149, 29, 81, 0.2);
          animation: pulse 1.5s infinite;
        }

        @keyframes pulse {
          0%, 100% {
            opacity: 1;
          }
          50% {
            opacity: 0.6;
          }
        }

        .icon-button svg {
          width: 20px;
          height: 20px;
        }
      </style>
      <form class="search-form" role="search">
        <div class="search-container">
          <input 
            type="search" 
            class="search-input" 
            placeholder="Waar ben je naar op zoek?"
            aria-label="Zoek boeken en auteurs"
          >
          <div class="icon-buttons">
            <button 
              type="button" 
              class="icon-button mic-button" 
              aria-label="Zoeken met spraak"
              aria-pressed="false"
            >
              ${micIcon({ size: 20, color: iconColor })}
            </button>
            <button 
              type="submit" 
              class="icon-button search-button" 
              aria-label="Zoeken"
            >
              ${searchIcon({ size: 20, color: iconColor })}
            </button>
          </div>
        </div>
      </form>
    `;
  }
}

customElements.define("search-bar", SearchBar);