import { IconDefinition } from "@fortawesome/fontawesome-svg-core";
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import "bootstrap/dist/css/bootstrap.min.css";
import * as React from "react";
import { Nav, Navbar, NavDropdown } from "react-bootstrap";

export interface ToolbarProps<D> {
  toolbar: IToolbar<D>;
  generateData(): D;
  position?: "top" | "bottom";
  sticky?: boolean;
  bg?: "light" | "dark";
  brand?: ILink;
}

/**
 * Definition of a Toolbar.
 *
 * @export
 * @interface IToolbar
 * @template D
 */
export interface IToolbar<D> {
  /**
   * Items of the toolbar.
   *
   * @type {(Array<IAction<D> | IMenu<D> | ILink>)}
   * @memberof IToolbar
   */
  items: Array<IAction<D> | IMenu<D> | ILink>;
}

export interface IAction<D> {
  type: "action";
  /**
   * Action which should be performed if the element
   * has been clicked.
   *
   * @param {D} data
   * @memberof IAction
   */
  onClick(data: D): void;
  /**
   * Label of the Menu.
   *
   * @type {string}
   * @memberof IAction
   */
  label: string;
  /**
   * Additional Icon.
   */
  icon?: IconDefinition;
}

/**
 * A Menu of the Toolbar
 *
 * @export
 * @interface IMenu
 * @template D
 */
export interface IMenu<D> {
  type: "menu";
  /**
   * The Menu ID.
   *
   * @type {string}
   * @memberof IMenu
   */
  id: string;
  /**
   * Label of the Menu
   *
   * @type {string}
   * @memberof IMenu
   */
  label: string;
  /**
   * Items of the Menu.
   *
   * @type {(Array<IAction<D> | ILink | IDivider>)}
   * @memberof IMenu
   */
  items: Array<IAction<D> | IMenu<D> | ILink | IDivider>;
}

/**
 * A Classical Link.
 *
 * @export
 * @interface ILink
 */
export interface ILink {
  /**
   * Type of the Element.
   *
   * @type {'link'}
   * @memberof ILink
   */
  type: "link";
  /**
   * Label
   *
   * @type {string}
   * @memberof ILink
   */
  label: string;
  /**
   * Referene, where the client should be navigated on click
   *
   * @type {string}
   * @memberof ILink
   */
  ref: string;
  /**
   * Additional Icon.
   */
  icon?: IconDefinition | string;
}

/**
 * A Divider in a Menu.
 *
 * @export
 * @interface IDivider
 */
export interface IDivider {
  /**
   * Type Element
   *
   * @type {'divider'}
   * @memberof IDivider
   */
  type: "divider";
}

export type ToolbarState<D> = ToolbarProps<D>;

class Toolbar<D> extends React.Component<ToolbarProps<D>, ToolbarState<D>> {
  private _currentId = 0;

  constructor(props) {
    super(props);
    this.state = Object.assign(
      {
        bg: "dark",
        position: "top",
        sticky: true
      },
      this.props
    );
  }

  _generateId() {
    const id = this._currentId;
    this._currentId += 1;
    return id;
  }

  _renderMenuEntry(entry: IAction<D> | IMenu<D> | ILink) {
    const _this = this;

    switch (entry.type) {
      case "action":
        if (entry.icon) {
          return (
            <Nav.Link
              key={this._generateId()}
              onClick={(e) => {
                entry.onClick(this.state.generateData());
              }}
            >
              <FontAwesomeIcon icon={entry.icon} /> {entry.label}
            </Nav.Link>
          );
        }
        return (
          <Nav.Link
            key={this._generateId()}
            onClick={(e) => {
              entry.onClick(this.state.generateData());
            }}
          >
            {entry.label}
          </Nav.Link>
        );
      case "menu":
        return this._renderDropdown(entry);
      case "link":
        if (entry.icon && typeof entry.icon === "object") {
          return (
            <Nav.Link key={this._generateId()} href={entry.ref}>
              <FontAwesomeIcon icon={entry.icon} /> {entry.label}
            </Nav.Link>
          );
        } else if (entry.icon && typeof entry.icon === "string") {
          return (
            <Nav.Link key={this._generateId()} href={entry.ref}>
              <img
                src={entry.icon}
                width="30"
                height="30"
                className="d-inline-block align-top"
              />
            </Nav.Link>
          );
        }
        return (
          <Nav.Link key={this._generateId()} href={entry.ref}>
            {entry.label}
          </Nav.Link>
        );
    }
  }

  _renderDropdown(item: IMenu<D>) {
    // Issue: Drop-Down wont display the Dropdowns after opening a modal:
    // Issue: https://github.com/react-bootstrap/react-bootstrap/issues/5409
    // Dirty Fix: onClick={e => e.stopPropagation() in the "NavDropdown"
    return (
      <NavDropdown
        key={this._generateId()}
        id={item.id}
        title={item.label}
        onClick={(e) => e.stopPropagation()}
      >
        {/* Iterate over the deteced Modules. */}
        {item.items.map((entry) => {
          switch (entry.type) {
            case "action":
              if (entry.icon) {
                return (
                  <NavDropdown.Item
                    key={this._generateId()}
                    onClick={(e) => {
                      entry.onClick(this.state.generateData());
                    }}
                  >
                    <FontAwesomeIcon icon={entry.icon} /> {entry.label}
                  </NavDropdown.Item>
                );
              }
              return (
                <Nav.Link
                  key={this._generateId()}
                  onClick={(e) => {
                    entry.onClick(this.state.generateData());
                  }}
                >
                  {entry.label}
                </Nav.Link>
              );
            case "divider":
              return <NavDropdown.Divider key={this._generateId()} />;
            case "link":
              if (entry.icon && typeof entry.icon === "object") {
                return (
                  <NavDropdown.Item key={this._generateId()} href={entry.ref}>
                    <FontAwesomeIcon icon={entry.icon} /> {entry.label}
                  </NavDropdown.Item>
                );
              }
              return (
                <NavDropdown.Item key={this._generateId()} href={entry.ref}>
                  {entry.label}
                </NavDropdown.Item>
              );
            case "menu":
              return this._renderDropdown(entry);
          }
        })}
      </NavDropdown>
    );
  }

  _renderBrand() {
    switch (typeof this.state.brand.icon) {
      case "string":
        return (
          <img
            src={this.state.brand.icon}
            height="30"
            className="d-inline-block align-top"
          />
        );
      case "object":
        return <FontAwesomeIcon icon={this.state.brand.icon as any} />;
    }
  }

  /**
   * Main Function to Render the Layout
   */
  render() {
    this._currentId = 0;

    return (
      <>
        {this.state.sticky ? (
          // Render a collapsable Navbar containing the defined Menu structure.
          <Navbar
            collapseOnSelect
            sticky={this.state.position}
            expand="lg"
            bg={this.state.bg}
            variant={this.state.bg}
          >
            {this.state.brand ? (
              <>
                <Navbar.Brand href={this.state.brand.ref}>
                  {this._renderBrand()}
                  {this.state.brand.label}
                </Navbar.Brand>
                <Navbar.Toggle aria-controls="responsive-navbar-nav" />
              </>
            ) : (
              <Navbar.Toggle aria-controls="responsive-navbar-nav" />
            )}
            <Navbar.Collapse id="responsive-navbar-nav">
              <Nav>
                {this.state.toolbar.items.map((item) =>
                  this._renderMenuEntry(item)
                )}
              </Nav>
            </Navbar.Collapse>
          </Navbar>
        ) : (
          <Navbar
            collapseOnSelect
            fixed={this.state.position}
            expand="lg"
            bg={this.state.bg}
            variant={this.state.bg}
          >
            {this.state.brand ? (
              <>
                <Navbar.Brand href={this.state.brand.ref}>
                  {this._renderBrand()}
                  {this.state.brand.label}
                </Navbar.Brand>
                <Navbar.Toggle aria-controls="responsive-navbar-nav" />
              </>
            ) : (
              <Navbar.Toggle aria-controls="responsive-navbar-nav" />
            )}
            <Navbar.Collapse id="responsive-navbar-nav">
              <Nav>
                {this.state.toolbar.items.map((item) =>
                  this._renderMenuEntry(item)
                )}
              </Nav>
            </Navbar.Collapse>
          </Navbar>
        )}
      </>
    );
  }
}

export default Toolbar;