import { html, css, LitElement, PropertyValues } from "lit";
import { customElement, property, state, query } from "lit/decorators.js";
import "@shoelace-style/shoelace/dist/themes/light.css";
import { SlSelect, SlInput } from "@shoelace-style/shoelace";
import Drawflow, { DrawflowNode } from "drawflow";
import file from "@tabler/icons/outline/file.svg";
import squares from "@tabler/icons/outline/squares.svg";
import arrowsSplit2 from "@tabler/icons/outline/arrows-split-2.svg";
import search from "@tabler/icons/outline/search.svg";

import { provide, consume, createContext } from "@lit/context";
import {
  editorState,
  GamebookEditorState,
} from "../../utils/gamebook-editor-state-context";

@customElement("node-output-select")
export class NodeOutputSelect extends LitElement {
  @property({ type: Number }) accessor incomingNodeId;
  @property({ type: String }) accessor outputClass;
  @property({ type: Boolean }) accessor disabled;
  @property({ type: Boolean }) accessor required;
  @property({ type: Boolean }) accessor inOutputList;
  @property({ type: Boolean }) accessor isOpen;

  @consume({ context: editorState, subscribe: true })
  @property({ type: Object, attribute: true, reflect: false })
  public accessor editorStore = new GamebookEditorState("Default");

  @state() accessor searchTerm = "";

  @query("sl-input") accessor searchElement!: SlInput;
  @query("sl-select") accessor selectElement!: SlSelect;

  static styles = css`
    .node-option-visible {
      display: block;
    }
    .node-option-hidden {
      display: none;
    }

    :host([in-output-list]) sl-select {
      --sl-input-border-width: 0px;
      --sl-input-padding: 0px;
    }
    :host([in-output-list]) sl-select::part(listbox) {
      width: 250px;
      height: 250px;
    }

    :host([in-output-list]) sl-select::part(display-input) {
      border: none;
      font-weight: 500;
      color: #0084c7;
      font-size: 12px;
      width: 70px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      text-align: left;
    }

    sl-select::part(listbox) {
      width: 250px;
      height: 250px;
    }

    sl-select.no-value::part(combobox) {
      border: 1px solid #dc2625;
    }

    .icon-header {
      display: flex;
      align-items: center;
      gap: 7px;
    }

    .searchInput {
      --sl-input-border-width: 1px;
    }
  `;

  /*

  */
  firstUpdated() {
    const openObserver = new MutationObserver((mutations) => {
      mutations.forEach((mutation) => {
        if (
          mutation.type === "attributes" &&
          mutation.attributeName === "open"
        ) {
          this.onOpenChange(this.selectElement.hasAttribute("open"));
        }
      });
    });
    openObserver.observe(this.selectElement, { attributes: true });

    //this.hasValue = this.selectElement.value != "-1";
  }

  /*

  */
  render() {
    const data = this.editorStore.editorContent.drawflow.Home.data;
    const nodeId = this.editorStore.selectedNode.id;

    const dataFiltered = Object.keys(data).filter(
      (key) =>
        data[key].id !== nodeId && data[key].id !== Number(this.incomingNodeId)
    );

    const options = (nodeClass) =>
      Object.keys(data)
        .filter(
          (key) =>
            data[key].id !== nodeId &&
            data[key].id !== Number(this.incomingNodeId) &&
            data[key].class === nodeClass
        )
        .map(
          (key) => html`<sl-option
            value="${data[key].id}"
            class="node-option-visible ${data[key].class}"
            @mouseenter=${() => this.highlightNode(data[key].id)}
            @mouseleave=${() => this.unhighlightNode(data[key].id)}
            >${data[key].data.title}</sl-option
          >`
        );

    const hasNodesOfClass = (nodeClass) =>
      Object.keys(data).some(
        (key) =>
          data[key].id !== nodeId &&
          data[key].id !== Number(this.incomingNodeId) &&
          data[key].class === nodeClass
      );

    return html`
      <sl-select
        placement="bottom"
        hoist
        class="${!this.editorStore.selectedNode?.outputs?.[this.outputClass]
          ?.connections?.[0]?.node &&
        this.required &&
        !this.disabled
          ? "no-value"
          : ""}"
        size=${this.inOutputList ? "small" : "medium"}
        placeholder="Not connected"
        clearable
        .value=${this.editorStore.selectedNode.outputs?.[this.outputClass]
          ?.connections?.[0]?.node ?? ""}
        @sl-input=${this._handleUserInputTargetPage}
        @mouseenter=${() => {
          if (!this.isOpen) {
            this.highlightConnection();
          }
        }}
        @mouseleave=${() => {
          if (!this.isOpen) {
            this.unhighlightConnection();
          }
        }}
        ?disabled=${this.disabled}
      >
        <div style="padding: 10px">
          <sl-input
            placeholder="Search..."
            @sl-input=${this.handleSearch}
            @click=${() => this.searchElement.focus()}
            @keydown=${this.handleKeydown}
            clearable
            class="searchInput"
          >
            <sl-icon src=${search} slot="prefix"></sl-icon>
          </sl-input>
        </div>
        <sl-divider></sl-divider>

        ${dataFiltered.length === 0
          ? html`<small>No nodes found</small>`
          : html`
              ${hasNodesOfClass("page") || hasNodesOfClass("origin")
                ? html`
                    <small class="icon-header" id="divider-page"
                      ><sl-icon src="${file}"></sl-icon> Pages</small
                    >
                    ${options("page")} ${options("origin")}
                    ${hasNodesOfClass("popup") || hasNodesOfClass("branch")
                      ? html`<sl-divider id="divider-page"></sl-divider>`
                      : ""}
                  `
                : ""}
              ${hasNodesOfClass("popup")
                ? html`
                    <small class="icon-header" id="divider-popup"
                      ><sl-icon src="${squares}"></sl-icon> Popup</small
                    >
                    ${options("popup")}
                    ${hasNodesOfClass("branch")
                      ? html`<sl-divider id="divider-popup"></sl-divider>`
                      : ""}
                  `
                : ""}
              ${hasNodesOfClass("branch")
                ? html`
                    <small class="icon-header" id="divider-branch"
                      ><sl-icon src="${arrowsSplit2}"></sl-icon> Branch</small
                    >
                    ${options("branch")}
                  `
                : ""}
              <small id="no-nodes-found" style="display: none"
                >No nodes found</small
              >
            `}
      </sl-select>
    `;
  }

  /*

  */
  private handleSearch(event: Event) {
    const searchTerm = (event.target as HTMLInputElement).value.toLowerCase();
    this.searchTerm = searchTerm;

    this.shadowRoot.querySelectorAll("sl-option").forEach((option) => {
      const title = option.textContent.toLowerCase();
      option.classList.toggle(
        "node-option-visible",
        title.includes(searchTerm)
      );
      option.classList.toggle(
        "node-option-hidden",
        !title.includes(searchTerm)
      );
    });

    this._toggleDividers(
      "page",
      this.hasVisibleNodesOfClass("page") ||
        this.hasVisibleNodesOfClass("origin")
    );
    this._toggleDividers("popup", this.hasVisibleNodesOfClass("popup"));
    this._toggleDividers("branch", this.hasVisibleNodesOfClass("branch"));
    (
      this.shadowRoot.querySelector("#no-nodes-found") as HTMLElement
    ).style.display = this._hasNoVisibleNodes() ? "block" : "none";
  }

  /*

  */
  private _toggleDividers(dividerId: string, shouldDisplay: boolean) {
    const displayStyle = shouldDisplay ? "flex" : "none";
    this.shadowRoot
      .querySelectorAll(`#divider-${dividerId}`)
      .forEach((element) => {
        (element as HTMLElement).style.display = displayStyle;
      });
  }

  /*

  */
  private _hasNoVisibleNodes() {
    return !(
      this.hasVisibleNodesOfClass("page") ||
      this.hasVisibleNodesOfClass("origin") ||
      this.hasVisibleNodesOfClass("popup") ||
      this.hasVisibleNodesOfClass("branch")
    );
  }

  /*

  */
  private hasVisibleNodesOfClass(nodeClass: string) {
    return (
      this.shadowRoot.querySelectorAll(`.node-option-visible.${nodeClass}`)
        .length > 0
    );
  }

  /*

  */
  private handleKeydown(event: KeyboardEvent) {
    this.searchElement.focus();
    event.stopPropagation();
  }

  /*

  */
  private _handleUserInputTargetPage(event: Event) {
    if (
      event.target instanceof HTMLElement &&
      event.target.tagName.toLowerCase() === "sl-select"
    ) {
      const selectedValue = (event.target as SlSelect).value;

      const connections =
        this.editorStore.selectedNode?.outputs?.[this.outputClass]?.connections;

      //this.hasValue = selectedValue !== "";
      if (connections?.[0]?.node === undefined && selectedValue) {
        const event = new CustomEvent("createConnection", {
          detail: {
            outputNodeId: this.editorStore.selectedNode.id,
            inputNodeId: selectedValue,
            outputClass: this.outputClass,
            inputClass: "input_1",
          },
          bubbles: true,
          composed: true,
        });
        this.dispatchEvent(event);
      }
      //
      else if (connections?.[0]?.node !== undefined && selectedValue) {
        const removeEvent = new CustomEvent("deleteConnection", {
          detail: {
            outputNodeId: this.editorStore.selectedNode.id,
            inputNodeId: connections[0].node,
            outputClass: this.outputClass,
            inputClass: "input_1",
          },
          bubbles: true,
          composed: true,
        });
        this.dispatchEvent(removeEvent);

        const createEvent = new CustomEvent("createConnection", {
          detail: {
            outputNodeId: this.editorStore.selectedNode.id,
            inputNodeId: selectedValue,
            outputClass: this.outputClass,
            inputClass: "input_1",
          },
          bubbles: true,
          composed: true,
        });
        this.dispatchEvent(createEvent);
      }
      //
      else if (!selectedValue) {
        const removeEvent = new CustomEvent("deleteConnection", {
          detail: {
            outputNodeId: this.editorStore.selectedNode.id,
            inputNodeId: connections?.[0]?.node,
            outputClass: this.outputClass,
            inputClass: "input_1",
          },
          bubbles: true,
          composed: true,
        });
        this.dispatchEvent(removeEvent);
      }
    }

    this.requestUpdate();
  }

  /*

  */
  private onOpenChange(isOpen: boolean) {
    this.isOpen = isOpen;
    if (isOpen) {
      this.unhighlightConnection();
      this.dispatchEvent(
        new CustomEvent("highlightOutput", {
          detail: {
            outputNodeId: this.editorStore.selectedNode.id,
            outputClass: this.outputClass,
          },
          bubbles: true,
          composed: true,
        })
      );
    } else {
      this.unhighlightConnection();
    }
  }

  /*

  */
  private highlightConnection() {
    this.dispatchEvent(
      new CustomEvent("highlightConnection", {
        detail: {
          outputNodeId: this.editorStore.selectedNode.id,
          inputNodeId:
            this.editorStore.selectedNode?.outputs?.[this.outputClass]
              ?.connections?.[0]?.node,
          outputClass: this.outputClass,
          inputClass: "input_1",
          highlightButton: true,
        },
        bubbles: true,
        composed: true,
      })
    );
  }

  /*

  */
  private unhighlightConnection() {
    this.dispatchEvent(
      new CustomEvent("unhighlightConnection", {
        detail: {
          outputNodeId: this.editorStore.selectedNode.id,
          inputNodeId:
            this.editorStore.selectedNode?.outputs?.[this.outputClass]
              ?.connections?.[0]?.node,
          outputClass: this.outputClass,
          inputClass: "input_1",
          highlightButton: true,
        },
        bubbles: true,
        composed: true,
      })
    );
  }

  /*

  */
  private highlightNode(nodeId) {
    this.dispatchEvent(
      new CustomEvent("highlightNode", {
        detail: {
          nodeId: nodeId,
        },
        bubbles: true,
        composed: true,
      })
    );
  }

  /*

  */
  private unhighlightNode(nodeId) {
    this.dispatchEvent(
      new CustomEvent("unhighlightNode", {
        detail: {
          nodeId: nodeId,
        },
        bubbles: true,
        composed: true,
      })
    );
  }
}