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import { tabbable, focusable, isFocusable, isTabbable } from 'tabbable';

const activeFocusTraps = (function () {
  const trapQueue = [];
  return {
    activateTrap(trap) {
      if (trapQueue.length > 0) {
        const activeTrap = trapQueue[trapQueue.length - 1];
        if (activeTrap !== trap) {
          activeTrap.pause();
        }
      }

const trapIndex = trapQueue.indexOf(trap);
      if (trapIndex === -1) {
        trapQueue.push(trap);
      } else {
        // move this existing trap to the front of the queue
        trapQueue.splice(trapIndex, 1);
        trapQueue.push(trap);
      }
    },

deactivateTrap(trap) {
      const trapIndex = trapQueue.indexOf(trap);
      if (trapIndex !== -1) {
        trapQueue.splice(trapIndex, 1);
      }

if (trapQueue.length > 0) {
        trapQueue[trapQueue.length - 1].unpause();
      }
    },
  };
})();

const isSelectableInput = function (node) {
  return (
    node.tagName &&
    node.tagName.toLowerCase() === 'input' &&
    typeof node.select === 'function'
  );
};

const isEscapeEvent = function (e) {
  return e.key === 'Escape' || e.key === 'Esc' || e.keyCode === 27;
};

const isTabEvent = function (e) {
  return e.key === 'Tab' || e.keyCode === 9;
};

const delay = function (fn) {
  return setTimeout(fn, 0);
};

// Array.find/findIndex() are not supported on IE; this replicates enough
//  of Array.findIndex() for our needs
const findIndex = function (arr, fn) {
  let idx = -1;

arr.every(function (value, i) {
    if (fn(value)) {
      idx = i;
      return false; // break
    }

return true; // next
  });

return idx;
};

/**
 * Get an option's value when it could be a plain value, or a handler that provides
 *  the value.
 * @param {*} value Option's value to check.
 * @param {...*} [params] Any parameters to pass to the handler, if `value` is a function.
 * @returns {*} The `value`, or the handler's returned value.
 */
const valueOrHandler = function (value, ...params) {
  return typeof value === 'function' ? value(...params) : value;
};

const getActualTarget = function (event) {
  // NOTE: If the trap is _inside_ a shadow DOM, event.target will always be the
  //  shadow host. However, event.target.composedPath() will be an array of
  //  nodes "clicked" from inner-most (the actual element inside the shadow) to
  //  outer-most (the host HTML document). If we have access to composedPath(),
  //  then use its first element; otherwise, fall back to event.target (and
  //  this only works for an _open_ shadow DOM; otherwise,
  //  composedPath()[0] === event.target always).
  return event.target.shadowRoot && typeof event.composedPath === 'function'
    ? event.composedPath()[0]
    : event.target;
};

const createFocusTrap = function (elements, userOptions) {
  // SSR: a live trap shouldn't be created in this type of environment so this
  //  should be safe code to execute if the `document` option isn't specified
  const doc = userOptions?.document || document;

const config = {
    returnFocusOnDeactivate: true,
    escapeDeactivates: true,
    delayInitialFocus: true,
    ...userOptions,
  };

const state = {
    // containers given to createFocusTrap()
    // @type {Array<HTMLElement>}
    containers: [],

// list of objects identifying tabbable nodes in `containers` in the trap
    // NOTE: it's possible that a group has no tabbable nodes if nodes get removed while the trap
    //  is active, but the trap should never get to a state where there isn't at least one group
    //  with at least one tabbable node in it (that would lead to an error condition that would
    //  result in an error being thrown)
    // @type {Array<{
    //   container: HTMLElement,
    //   tabbableNodes: Array<HTMLElement>, // empty if none
    //   focusableNodes: Array<HTMLElement>, // empty if none
    //   firstTabbableNode: HTMLElement|null,
    //   lastTabbableNode: HTMLElement|null,
    //   nextTabbableNode: (node: HTMLElement, forward: boolean) => HTMLElement|undefined
    // }>}
    containerGroups: [], // same order/length as `containers` list

// references to objects in `containerGroups`, but only those that actually have
    //  tabbable nodes in them
    // NOTE: same order as `containers` and `containerGroups`, but __not necessarily__
    //  the same length
    tabbableGroups: [],

nodeFocusedBeforeActivation: null,
    mostRecentlyFocusedNode: null,
    active: false,
    paused: false,

// timer ID for when delayInitialFocus is true and initial focus in this trap
    //  has been delayed during activation
    delayInitialFocusTimer: undefined,
  };

let trap; // eslint-disable-line prefer-const -- some private functions reference it, and its methods reference private functions, so we must declare here and define later

/**
   * Gets a configuration option value.
   * @param {Object|undefined} configOverrideOptions If true, and option is defined in this set,
   *  value will be taken from this object. Otherwise, value will be taken from base configuration.
   * @param {string} optionName Name of the option whose value is sought.
   * @param {string|undefined} [configOptionName] Name of option to use __instead of__ `optionName`
   *  IIF `configOverrideOptions` is not defined. Otherwise, `optionName` is used.
   */
  const getOption = (configOverrideOptions, optionName, configOptionName) => {
    return configOverrideOptions &&
      configOverrideOptions[optionName] !== undefined
      ? configOverrideOptions[optionName]
      : config[configOptionName || optionName];
  };

/**
   * Finds the index of the container that contains the element.
   * @param {HTMLElement} element
   * @returns {number} Index of the container in either `state.containers` or
   *  `state.containerGroups` (the order/length of these lists are the same); -1
   *  if the element isn't found.
   */
  const findContainerIndex = function (element) {
    // NOTE: search `containerGroups` because it's possible a group contains no tabbable
    //  nodes, but still contains focusable nodes (e.g. if they all have `tabindex=-1`)
    //  and we still need to find the element in there
    return state.containerGroups.findIndex(
      ({ container, tabbableNodes }) =>
        container.contains(element) ||
        // fall back to explicit tabbable search which will take into consideration any
        //  web components if the `tabbableOptions.getShadowRoot` option was used for
        //  the trap, enabling shadow DOM support in tabbable (`Node.contains()` doesn't
        //  look inside web components even if open)
        tabbableNodes.find((node) => node === element)
    );
  };

/**
   * Gets the node for the given option, which is expected to be an option that
   *  can be either a DOM node, a string that is a selector to get a node, `false`
   *  (if a node is explicitly NOT given), or a function that returns any of these
   *  values.
   * @param {string} optionName
   * @returns {undefined | false | HTMLElement | SVGElement} Returns
   *  `undefined` if the option is not specified; `false` if the option
   *  resolved to `false` (node explicitly not given); otherwise, the resolved
   *  DOM node.
   * @throws {Error} If the option is set, not `false`, and is not, or does not
   *  resolve to a node.
   */
  const getNodeForOption = function (optionName, ...params) {
    let optionValue = config[optionName];

if (typeof optionValue === 'function') {
      optionValue = optionValue(...params);
    }

if (optionValue === true) {
      optionValue = undefined; // use default value
    }

if (!optionValue) {
      if (optionValue === undefined || optionValue === false) {
        return optionValue;
      }
      // else, empty string (invalid), null (invalid), 0 (invalid)

throw new Error(
        `\`${optionName}\` was specified but was not a node, or did not return a node`
      );
    }

let node = optionValue; // could be HTMLElement, SVGElement, or non-empty string at this point

if (typeof optionValue === 'string') {
      node = doc.querySelector(optionValue); // resolve to node, or null if fails
      if (!node) {
        throw new Error(
          `\`${optionName}\` as selector refers to no known node`
        );
      }
    }

return node;
  };

const getInitialFocusNode = function () {
    let node = getNodeForOption('initialFocus');

// false explicitly indicates we want no initialFocus at all
    if (node === false) {
      return false;
    }

if (node === undefined) {
      // option not specified: use fallback options
      if (findContainerIndex(doc.activeElement) >= 0) {
        node = doc.activeElement;
      } else {
        const firstTabbableGroup = state.tabbableGroups[0];
        const firstTabbableNode =
          firstTabbableGroup && firstTabbableGroup.firstTabbableNode;

// NOTE: `fallbackFocus` option function cannot return `false` (not supported)
        node = firstTabbableNode || getNodeForOption('fallbackFocus');
      }
    }

if (!node) {
      throw new Error(
        'Your focus-trap needs to have at least one focusable element'
      );
    }

return node;
  };

const updateTabbableNodes = function () {
    state.containerGroups = state.containers.map((container) => {
      const tabbableNodes = tabbable(container, config.tabbableOptions);

// NOTE: if we have tabbable nodes, we must have focusable nodes; focusable nodes
      //  are a superset of tabbable nodes
      const focusableNodes = focusable(container, config.tabbableOptions);

return {
        container,
        tabbableNodes,
        focusableNodes,
        firstTabbableNode: tabbableNodes.length > 0 ? tabbableNodes[0] : null,
        lastTabbableNode:
          tabbableNodes.length > 0
            ? tabbableNodes[tabbableNodes.length - 1]
            : null,

/**
         * Finds the __tabbable__ node that follows the given node in the specified direction,
         *  in this container, if any.
         * @param {HTMLElement} node
         * @param {boolean} [forward] True if going in forward tab order; false if going
         *  in reverse.
         * @returns {HTMLElement|undefined} The next tabbable node, if any.
         */
        nextTabbableNode(node, forward = true) {
          // NOTE: If tabindex is positive (in order to manipulate the tab order separate
          //  from the DOM order), this __will not work__ because the list of focusableNodes,
          //  while it contains tabbable nodes, does not sort its nodes in any order other
          //  than DOM order, because it can't: Where would you place focusable (but not
          //  tabbable) nodes in that order? They have no order, because they aren't tabbale...
          // Support for positive tabindex is already broken and hard to manage (possibly
          //  not supportable, TBD), so this isn't going to make things worse than they
          //  already are, and at least makes things better for the majority of cases where
          //  tabindex is either 0/unset or negative.
          // FYI, positive tabindex issue: https://github.com/focus-trap/focus-trap/issues/375
          const nodeIdx = focusableNodes.findIndex((n) => n === node);
          if (nodeIdx < 0) {
            return undefined;
          }

if (forward) {
            return focusableNodes
              .slice(nodeIdx + 1)
              .find((n) => isTabbable(n, config.tabbableOptions));
          }

return focusableNodes
            .slice(0, nodeIdx)
            .reverse()
            .find((n) => isTabbable(n, config.tabbableOptions));
        },
      };
    });

state.tabbableGroups = state.containerGroups.filter(
      (group) => group.tabbableNodes.length > 0
    );

// throw if no groups have tabbable nodes and we don't have a fallback focus node either
    if (
      state.tabbableGroups.length <= 0 &&
      !getNodeForOption('fallbackFocus') // returning false not supported for this option
    ) {
      throw new Error(
        'Your focus-trap must have at least one container with at least one tabbable node in it at all times'
      );
    }
  };

const tryFocus = function (node) {
    if (node === false) {
      return;
    }

if (node === doc.activeElement) {
      return;
    }

if (!node || !node.focus) {
      tryFocus(getInitialFocusNode());
      return;
    }

node.focus({ preventScroll: !!config.preventScroll });
    state.mostRecentlyFocusedNode = node;

if (isSelectableInput(node)) {
      node.select();
    }
  };

const getReturnFocusNode = function (previousActiveElement) {
    const node = getNodeForOption('setReturnFocus', previousActiveElement);
    return node ? node : node === false ? false : previousActiveElement;
  };

// This needs to be done on mousedown and touchstart instead of click
  // so that it precedes the focus event.
  const checkPointerDown = function (e) {
    const target = getActualTarget(e);

if (findContainerIndex(target) >= 0) {
      // allow the click since it ocurred inside the trap
      return;
    }

if (valueOrHandler(config.clickOutsideDeactivates, e)) {
      // immediately deactivate the trap
      trap.deactivate({
        // if, on deactivation, we should return focus to the node originally-focused
        //  when the trap was activated (or the configured `setReturnFocus` node),
        //  then assume it's also OK to return focus to the outside node that was
        //  just clicked, causing deactivation, as long as that node is focusable;
        //  if it isn't focusable, then return focus to the original node focused
        //  on activation (or the configured `setReturnFocus` node)
        // NOTE: by setting `returnFocus: false`, deactivate() will do nothing,
        //  which will result in the outside click setting focus to the node
        //  that was clicked, whether it's focusable or not; by setting
        //  `returnFocus: true`, we'll attempt to re-focus the node originally-focused
        //  on activation (or the configured `setReturnFocus` node)
        returnFocus:
          config.returnFocusOnDeactivate &&
          !isFocusable(target, config.tabbableOptions),
      });
      return;
    }

// This is needed for mobile devices.
    // (If we'll only let `click` events through,
    // then on mobile they will be blocked anyways if `touchstart` is blocked.)
    if (valueOrHandler(config.allowOutsideClick, e)) {
      // allow the click outside the trap to take place
      return;
    }

// otherwise, prevent the click
    e.preventDefault();
  };

// In case focus escapes the trap for some strange reason, pull it back in.
  const checkFocusIn = function (e) {
    const target = getActualTarget(e);
    const targetContained = findContainerIndex(target) >= 0;

// In Firefox when you Tab out of an iframe the Document is briefly focused.
    if (targetContained || target instanceof Document) {
      if (targetContained) {
        state.mostRecentlyFocusedNode = target;
      }
    } else {
      // escaped! pull it back in to where it just left
      e.stopImmediatePropagation();
      tryFocus(state.mostRecentlyFocusedNode || getInitialFocusNode());
    }
  };

// Hijack Tab events on the first and last focusable nodes of the trap,
  // in order to prevent focus from escaping. If it escapes for even a
  // moment it can end up scrolling the page and causing confusion so we
  // kind of need to capture the action at the keydown phase.
  const checkTab = function (e) {
    const target = getActualTarget(e);
    updateTabbableNodes();

let destinationNode = null;

if (state.tabbableGroups.length > 0) {
      // make sure the target is actually contained in a group
      // NOTE: the target may also be the container itself if it's focusable
      //  with tabIndex='-1' and was given initial focus
      const containerIndex = findContainerIndex(target);
      const containerGroup =
        containerIndex >= 0 ? state.containerGroups[containerIndex] : undefined;

if (containerIndex < 0) {
        // target not found in any group: quite possible focus has escaped the trap,
        //  so bring it back in to...
        if (e.shiftKey) {
          // ...the last node in the last group
          destinationNode =
            state.tabbableGroups[state.tabbableGroups.length - 1]
              .lastTabbableNode;
        } else {
          // ...the first node in the first group
          destinationNode = state.tabbableGroups[0].firstTabbableNode;
        }
      } else if (e.shiftKey) {
        // REVERSE

// is the target the first tabbable node in a group?
        let startOfGroupIndex = findIndex(
          state.tabbableGroups,
          ({ firstTabbableNode }) => target === firstTabbableNode
        );

if (
          startOfGroupIndex < 0 &&
          (containerGroup.container === target ||
            (isFocusable(target, config.tabbableOptions) &&
              !isTabbable(target, config.tabbableOptions) &&
              !containerGroup.nextTabbableNode(target, false)))
        ) {
          // an exception case where the target is either the container itself, or
          //  a non-tabbable node that was given focus (i.e. tabindex is negative
          //  and user clicked on it or node was programmatically given focus)
          //  and is not followed by any other tabbable node, in which
          //  case, we should handle shift+tab as if focus were on the container's
          //  first tabbable node, and go to the last tabbable node of the LAST group
          startOfGroupIndex = containerIndex;
        }

if (startOfGroupIndex >= 0) {
          // YES: then shift+tab should go to the last tabbable node in the
          //  previous group (and wrap around to the last tabbable node of
          //  the LAST group if it's the first tabbable node of the FIRST group)
          const destinationGroupIndex =
            startOfGroupIndex === 0
              ? state.tabbableGroups.length - 1
              : startOfGroupIndex - 1;

const destinationGroup = state.tabbableGroups[destinationGroupIndex];
          destinationNode = destinationGroup.lastTabbableNode;
        }
      } else {
        // FORWARD

// is the target the last tabbable node in a group?
        let lastOfGroupIndex = findIndex(
          state.tabbableGroups,
          ({ lastTabbableNode }) => target === lastTabbableNode
        );

if (
          lastOfGroupIndex < 0 &&
          (containerGroup.container === target ||
            (isFocusable(target, config.tabbableOptions) &&
              !isTabbable(target, config.tabbableOptions) &&
              !containerGroup.nextTabbableNode(target)))
        ) {
          // an exception case where the target is the container itself, or
          //  a non-tabbable node that was given focus (i.e. tabindex is negative
          //  and user clicked on it or node was programmatically given focus)
          //  and is not followed by any other tabbable node, in which
          //  case, we should handle tab as if focus were on the container's
          //  last tabbable node, and go to the first tabbable node of the FIRST group
          lastOfGroupIndex = containerIndex;
        }

if (lastOfGroupIndex >= 0) {
          // YES: then tab should go to the first tabbable node in the next
          //  group (and wrap around to the first tabbable node of the FIRST
          //  group if it's the last tabbable node of the LAST group)
          const destinationGroupIndex =
            lastOfGroupIndex === state.tabbableGroups.length - 1
              ? 0
              : lastOfGroupIndex + 1;

const destinationGroup = state.tabbableGroups[destinationGroupIndex];
          destinationNode = destinationGroup.firstTabbableNode;
        }
      }
    } else {
      // NOTE: the fallbackFocus option does not support returning false to opt-out
      destinationNode = getNodeForOption('fallbackFocus');
    }

if (destinationNode) {
      e.preventDefault();
      tryFocus(destinationNode);
    }
    // else, let the browser take care of [shift+]tab and move the focus
  };

const checkKey = function (e) {
    if (
      isEscapeEvent(e) &&
      valueOrHandler(config.escapeDeactivates, e) !== false
    ) {
      e.preventDefault();
      trap.deactivate();
      return;
    }

if (isTabEvent(e)) {
      checkTab(e);
      return;
    }
  };

const checkClick = function (e) {
    const target = getActualTarget(e);

if (findContainerIndex(target) >= 0) {
      return;
    }

if (valueOrHandler(config.clickOutsideDeactivates, e)) {
      return;
    }

if (valueOrHandler(config.allowOutsideClick, e)) {
      return;
    }

e.preventDefault();
    e.stopImmediatePropagation();
  };

//
  // EVENT LISTENERS
  //

const addListeners = function () {
    if (!state.active) {
      return;
    }

// There can be only one listening focus trap at a time
    activeFocusTraps.activateTrap(trap);

// Delay ensures that the focused element doesn't capture the event
    // that caused the focus trap activation.
    state.delayInitialFocusTimer = config.delayInitialFocus
      ? delay(function () {
          tryFocus(getInitialFocusNode());
        })
      : tryFocus(getInitialFocusNode());

doc.addEventListener('focusin', checkFocusIn, true);
    doc.addEventListener('mousedown', checkPointerDown, {
      capture: true,
      passive: false,
    });
    doc.addEventListener('touchstart', checkPointerDown, {
      capture: true,
      passive: false,
    });
    doc.addEventListener('click', checkClick, {
      capture: true,
      passive: false,
    });
    doc.addEventListener('keydown', checkKey, {
      capture: true,
      passive: false,
    });

return trap;
  };

const removeListeners = function () {
    if (!state.active) {
      return;
    }

doc.removeEventListener('focusin', checkFocusIn, true);
    doc.removeEventListener('mousedown', checkPointerDown, true);
    doc.removeEventListener('touchstart', checkPointerDown, true);
    doc.removeEventListener('click', checkClick, true);
    doc.removeEventListener('keydown', checkKey, true);

return trap;
  };

//
  // TRAP DEFINITION
  //

trap = {
    get active() {
      return state.active;
    },

get paused() {
      return state.paused;
    },

activate(activateOptions) {
      if (state.active) {
        return this;
      }

const onActivate = getOption(activateOptions, 'onActivate');
      const onPostActivate = getOption(activateOptions, 'onPostActivate');
      const checkCanFocusTrap = getOption(activateOptions, 'checkCanFocusTrap');

if (!checkCanFocusTrap) {
        updateTabbableNodes();
      }

state.active = true;
      state.paused = false;
      state.nodeFocusedBeforeActivation = doc.activeElement;

if (onActivate) {
        onActivate();
      }

if (checkCanFocusTrap) {
        checkCanFocusTrap(state.containers.concat()).then(
          finishActivation,
          finishActivation
        );
        return this;
      }

finishActivation();
      return this;
    },

deactivate(deactivateOptions) {
      if (!state.active) {
        return this;
      }

const options = {
        onDeactivate: config.onDeactivate,
        onPostDeactivate: config.onPostDeactivate,
        checkCanReturnFocus: config.checkCanReturnFocus,
        ...deactivateOptions,
      };

clearTimeout(state.delayInitialFocusTimer); // noop if undefined
      state.delayInitialFocusTimer = undefined;

removeListeners();
      state.active = false;
      state.paused = false;

activeFocusTraps.deactivateTrap(trap);

const onDeactivate = getOption(options, 'onDeactivate');
      const onPostDeactivate = getOption(options, 'onPostDeactivate');
      const checkCanReturnFocus = getOption(options, 'checkCanReturnFocus');
      const returnFocus = getOption(
        options,
        'returnFocus',
        'returnFocusOnDeactivate'
      );

if (onDeactivate) {
        onDeactivate();
      }

if (returnFocus && checkCanReturnFocus) {
        checkCanReturnFocus(
          getReturnFocusNode(state.nodeFocusedBeforeActivation)
        ).then(finishDeactivation, finishDeactivation);
        return this;
      }

finishDeactivation();
      return this;
    },

pause() {
      if (state.paused || !state.active) {
        return this;
      }

state.paused = true;
      removeListeners();

return this;
    },

unpause() {
      if (!state.paused || !state.active) {
        return this;
      }

state.paused = false;
      updateTabbableNodes();
      addListeners();

return this;
    },

updateContainerElements(containerElements) {
      const elementsAsArray = [].concat(containerElements).filter(Boolean);

state.containers = elementsAsArray.map((element) =>
        typeof element === 'string' ? doc.querySelector(element) : element
      );

if (state.active) {
        updateTabbableNodes();
      }

return this;
    },
  };

// initialize container elements
  trap.updateContainerElements(elements);

return trap;
};

export { createFocusTrap };