import { html, LitElement, css, nothing, svg } from "lit";
import { customElement, property, state, query } from "lit/decorators.js";
import { classMap } from "lit/directives/class-map.js";

/**
 * Information about a Nonprofit to show in search results.
 */
export interface Nonprofit {
  id: string;
  name: string;
  description: string;
  ein: string;
  category: string;
  icon_url: string;
  crypto: {
    solana_address: string;
    ethereum_address: string;
  };
}

/**
 * A search bar for nonprofits.
 */
@customElement("change-search-bar")
export class ChangeSearchBar extends LitElement {
  /** Path to an icon to display in the "no results" box. */
  @property() noResultsIcon!: string;

  /** Results for the current search query + filters. */
  @state()
  private searchResults: Nonprofit[] = [];

  @state()
  loading = false;

  /** The search input box. */
  @query("input[type=text]") searchInput!: HTMLInputElement;

  /** Used for cancelling search API requests */
  searchTimeout: number | undefined;

  constructor() {
    super();
  }

  render() {
    return html`
      <!-- Search box -->
      <div id="search-area">
        ${searchIcon()}
        <input
          type="text"
          placeholder="Nonprofit name or EIN"
          name="nonprofit-search"
          @input=${this.performSearch}
          class=${classMap({ "search-term": !this.noSearchTerm() })}
        ></input>
      </div>

      <!-- Search results -->
      ${
        this.noSearchTerm()
          ? nothing
          : html` <div id="backdrop">${this.renderSearchResults()}</div> `
      }
    `;
  }

  renderSearchResults() {
    return html`
      <div id="search-results" tabindex="1">
        ${this.searchResults.length !== 0
          ? html`
              ${this.searchResults.slice(0, 10).map(
                (nonprofit) => html`
                  <button
                    class="search-result"
                    @click=${() => this.handleSearchResultClick(nonprofit)}
                  >
                    <img src=${nonprofit.icon_url} />
                    <div class="name">${nonprofit.name}</div>
                    <div class="category">${nonprofit.category}</div>
                  </button>
                `
              )}
            `
          : nothing}
        ${this.searchResults.length === 0 && !this.loading
          ? html`
              <p id="no-results">
                <img src=${this.noResultsIcon} /><br /><b>No results.</b
                ><br />Are we missing a nonprofit? Email hello@getchange.io and
                we'll help!
              </p>
            `
          : nothing}
        ${this.loading
          ? html`
              <div id="loading-overlay"><span class="spinner"></span></div>
            `
          : nothing}
      </div>
    `;
  }

  clear() {
    this.searchInput.value = "";
    this.requestUpdate();
  }

  private handleSearchResultClick(nonprofit: Nonprofit) {
    this.dispatchEvent(
      new CustomEvent("select-nonprofit", {
        detail: nonprofit,
        bubbles: true,
        composed: true,
      })
    );
  }

  /**
   * Search nonprofits given the current state of the search input box and filters.
   */
  private performSearch() {
    const name = this.searchInput.value;
    if (name === "") {
      this.loading = false;
      this.searchResults = [];
      return;
    }

    this.loading = true;
    if (this.searchTimeout) {
      clearTimeout(this.searchTimeout);
    }
    this.searchTimeout = window.setTimeout(() => {
      const queryParams = new URLSearchParams();
      queryParams.append("search_term", name);

      fetch(
        `https://api.getchange.io/api/v1/nonprofit_basics?${queryParams.toString()}`,
        {
          headers: {
            "Content-Type": "application/json",
          },
        }
      )
        .then((response) => response.json())
        .then((response) => response.nonprofits as Nonprofit[])
        .then((nonprofits) => {
          this.searchResults = nonprofits;
        })
        .catch(() => {})
        .finally(() => {
          this.loading = false;
        });
    }, 200);
  }

  private noSearchTerm() {
    if (!this.searchInput) {
      return true;
    }
    const searchInputEmpty =
      this.searchInput.value === null || this.searchInput.value === "";
    return searchInputEmpty;
  }

  static styles = [
    css`
      :host {
        display: block;
        position: relative;
        --spinner-primary-color: white;
        --spinner-secondary-color: rgba(255, 255, 255, 0.2);
      }

      input:focus ~ #icon {
        opacity: 0.8;
      }

      #search-area {
        display: flex;
        align-items: center;
        position: relative;
        z-index: 2;
      }
      #search-area svg {
        position: absolute;
        left: 0.7em;
        width: 1.5em;
      }
      input {
        width: 100%;
        border-radius: 1em;
        background: var(--input-background-color, white);
        padding: 0.8em 1.1em 0.8em 3em;
        margin: 0;
        font-family: inherit;
        border: 1px solid var(--input-border-color, transparent);
        color: var(--input-color, black);
        box-shadow: 0px 0px 21px rgba(0, 0, 0, 0.04);
      }
      input.search-term {
        border-bottom-left-radius: 0;
        border-bottom-right-radius: 0;
        box-shadow: none;
        border-bottom: 1px solid var(--input-border-color, #ddd);
      }
      input::placeholder {
        color: var(--input-placeholder-color, #999);
      }
      #no-results {
        text-align: center;
        font-size: 1.3em;
      }
      #search-results {
        padding: 1.2em;
        position: relative;
        top: 0.1em;
        box-sizing: border-box;
        min-height: 9em;
      }
      .search-result {
        display: flex;
        align-items: center;
        padding: 9px 16px;
        margin: 0 -16px;
        width: calc(100% + 32px);
        border-radius: 6px;
        border: none;
        z-index: 1;
        color: inherit;
        text-decoration: none;
        background-color: transparent;
        transition: background-color 0.1s ease-out;
        white-space: nowrap;
        text-overflow: ellipsis;
      }
      .search-result img {
        height: 1.5em;
        border-radius: 50%;
        margin-right: 0.7em;
      }
      .search-result:hover {
        background-color: var(--search-result-background-hover, #f6f7fa);
      }
      .search-result .name {
      }
      @media (max-width: 800px) {
        .search-result .name {
          flex: 1;
        }
      }
      .search-result .category {
        color: var(--color, black);
        opacity: 0.5;
        margin-left: 12px;
      }
      #loading-overlay {
        position: absolute;
        display: flex;
        justify-content: center;
        background-color: rgba(0, 0, 0, 0.1);
        align-items: center;
        z-index: 10;
        --inset: 10px;
        left: var(--inset);
        right: var(--inset);
        top: calc(0.5em + var(--inset));
        bottom: var(--inset);
        border-radius: 1em;
      }
      #backdrop {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        background-color: var(--input-background-color, white);
        padding-top: 2.2em;
        border-radius: 1em;
        box-shadow: 0px 0px 21px rgba(0, 0, 0, 0.04);
        z-index: 1;
      }

      .spinner {
        width: 48px;
        height: 48px;
        border: 5px solid var(--spinner-primary-color, rgb(134, 55, 225));
        border-bottom-color: var(
          --spinner-secondary-color,
          rgba(134, 55, 225, 0.2)
        );
        border-radius: 50%;
        display: inline-block;
        box-sizing: border-box;
        animation: rotation 1s linear infinite;
      }

      @keyframes rotation {
        0% {
          transform: rotate(0deg);
        }
        100% {
          transform: rotate(360deg);
        }
      }

      button,
      input {
        font-size: inherit;
      }
      button {
        cursor: pointer;
      }
    `,
  ];
}

function searchIcon() {
  return svg`
    <svg width="54" height="54" viewBox="0 0 54 54" fill="none" xmlns="http://www.w3.org/2000/svg">
      <path d="M24.163 41.6551C33.8263 41.6551 41.66 33.8221 41.66 24.1596C41.66 14.4971 33.8263 6.66406 24.163 6.66406C14.4997 6.66406 6.66602 14.4971 6.66602 24.1596C6.66602 33.8221 14.4997 41.6551 24.163 41.6551Z" stroke="#8A959E" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
      <path d="M36.5332 36.5322L46.6565 46.6549" stroke="#8A959E" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
    </svg>
  `;
}