import { iphone, mobile } from "./environment";
import { EventHandlers } from "./eventhandlers";
import { EventRuler } from "./eventruler";
import {
  applyInputValue,
  clearOptionalTail,
  writeBuffer
} from "./inputHandling";
import {
  caret,
  getBuffer,
  getBufferTemplate,
  getLastValidPosition,
  resetMaskSet,
  seekNext
} from "./positioning";
import { isComplete } from "./validation";

export { mask };

// todo put on the prototype?
function mask() {
  const inputmask = this,
    opts = this.opts,
    el = this.el,
    $ = this.dependencyLib;

  function isElementTypeSupported(input, opts) {
    function patchValueProperty(npt) {
      let valueGet, valueSet;

      function patchValhook(type) {
        if (
          $.valHooks &&
          ($.valHooks[type] === undefined ||
            $.valHooks[type].inputmaskpatch !== true)
        ) {
          const valhookGet =
              $.valHooks[type] && $.valHooks[type].get
                ? $.valHooks[type].get
                : function (elem) {
                    return elem.value;
                  },
            valhookSet =
              $.valHooks[type] && $.valHooks[type].set
                ? $.valHooks[type].set
                : function (elem, value) {
                    elem.value = value;
                    return elem;
                  };

          $.valHooks[type] = {
            get: function (elem) {
              if (elem.inputmask) {
                if (elem.inputmask.opts.autoUnmask) {
                  return elem.inputmask.unmaskedvalue();
                } else {
                  const result = valhookGet(elem);
                  return getLastValidPosition.call(
                    inputmask,
                    undefined,
                    undefined,
                    elem.inputmask.maskset.validPositions
                  ) !== -1 || opts.nullable !== true
                    ? result
                    : "";
                }
              } else {
                return valhookGet(elem);
              }
            },
            set: function (elem, value) {
              const result = valhookSet(elem, value);
              if (elem.inputmask) {
                applyInputValue(elem, value);
              }
              return result;
            },
            inputmaskpatch: true
          };
        }
      }

      function getter() {
        if (this.inputmask) {
          return this.inputmask.opts.autoUnmask
            ? this.inputmask.unmaskedvalue()
            : getLastValidPosition.call(inputmask) !== -1 ||
              opts.nullable !== true
            ? (this.inputmask.shadowRoot || this.ownerDocument)
                .activeElement === this && opts.clearMaskOnLostFocus
              ? (inputmask.isRTL
                  ? clearOptionalTail
                      .call(inputmask, getBuffer.call(inputmask).slice())
                      .reverse()
                  : clearOptionalTail.call(
                      inputmask,
                      getBuffer.call(inputmask).slice()
                    )
                ).join("")
              : valueGet.call(this)
            : "";
        } else {
          return valueGet.call(this);
        }
      }

      function setter(value) {
        valueSet.call(this, value);
        if (this.inputmask) {
          applyInputValue(this, value);
        }
      }

      function installNativeValueSetFallback(npt) {
        EventRuler.on(npt, "mouseenter", function () {
          const input = this,
            value = input.inputmask._valueGet(true),
            bufferValue = (
              input.inputmask.isRTL
                ? getBuffer.call(input.inputmask).slice().reverse()
                : getBuffer.call(input.inputmask)
            ).join("");
          if (value != bufferValue) {
            applyInputValue(input, value);
          }
        });
      }

      if (!npt.inputmask.__valueGet) {
        if (opts.noValuePatching !== true) {
          if (Object.getOwnPropertyDescriptor) {
            const valueProperty = Object.getPrototypeOf
              ? Object.getOwnPropertyDescriptor(
                  Object.getPrototypeOf(npt),
                  "value"
                )
              : undefined;
            if (valueProperty && valueProperty.get && valueProperty.set) {
              valueGet = valueProperty.get;
              valueSet = valueProperty.set;
              Object.defineProperty(npt, "value", {
                get: getter,
                set: setter,
                configurable: true
              });
            } else if (npt.tagName.toLowerCase() !== "input") {
              valueGet = function () {
                return this.textContent;
              };
              valueSet = function (value) {
                this.textContent = value;
              };
              Object.defineProperty(npt, "value", {
                get: getter,
                set: setter,
                configurable: true
              });
            }
          } else if (
            document.__lookupGetter__ &&
            npt.__lookupGetter__("value")
          ) {
            valueGet = npt.__lookupGetter__("value");
            valueSet = npt.__lookupSetter__("value");

            npt.__defineGetter__("value", getter);
            npt.__defineSetter__("value", setter);
          }
          npt.inputmask.__valueGet = valueGet; // store native property getter
          npt.inputmask.__valueSet = valueSet; // store native property setter
        }
        npt.inputmask._valueGet = function (overruleRTL) {
          return inputmask.isRTL && overruleRTL !== true
            ? valueGet.call(this.el).split("").reverse().join("")
            : valueGet.call(this.el);
        };
        npt.inputmask._valueSet = function (value, overruleRTL) {
          // null check is needed for IE8 => otherwise converts to "null"
          valueSet.call(
            this.el,
            value === null || value === undefined
              ? ""
              : overruleRTL !== true && inputmask.isRTL
              ? value.split("").reverse().join("")
              : value
          );
        };

        if (valueGet === undefined) {
          // jquery.val fallback
          valueGet = function () {
            return this.value;
          };
          valueSet = function (value) {
            this.value = value;
          };
          patchValhook(npt.type);
          installNativeValueSetFallback(npt);
        }
      }
    }

    // if (input.tagName.toLowerCase() !== "textarea") {
    //     opts.ignorables.push(keys.Enter);
    // }

    let elementType = input.getAttribute("type"),
      isSupported =
        (input.tagName.toLowerCase() === "input" &&
          opts.supportsInputType.includes(elementType)) ||
        input.isContentEditable ||
        input.tagName.toLowerCase() === "textarea";
    if (!isSupported) {
      if (input.tagName.toLowerCase() === "input") {
        let el = document.createElement("input");
        el.setAttribute("type", elementType);
        isSupported = el.type === "text"; // apply mask only if the type is not natively supported
        el = null;
      } else {
        isSupported = "partial";
      }
    }
    if (isSupported !== false) {
      patchValueProperty(input);
    } else {
      input.inputmask = undefined;
    }
    return isSupported;
  }

  // unbind all events - to make sure that no other mask will interfere when re-masking
  EventRuler.off(el);
  const isSupported = isElementTypeSupported(el, opts);
  if (isSupported !== false) {
    inputmask.originalPlaceholder = el.placeholder;

    // read maxlength prop from el
    inputmask.maxLength = el !== undefined ? el.maxLength : undefined;
    if (inputmask.maxLength === -1) inputmask.maxLength = undefined;
    if ("inputMode" in el && el.getAttribute("inputmode") === null) {
      el.inputMode = opts.inputmode;
      el.setAttribute("inputmode", opts.inputmode);
    }

    if (isSupported === true) {
      opts.showMaskOnFocus =
        opts.showMaskOnFocus &&
        ["cc-number", "cc-exp"].indexOf(el.autocomplete) === -1;
      if (iphone) {
        // selecting the caret shows as a selection on iphone
        opts.insertModeVisual = false;
        // disable autocorrect
        el.setAttribute("autocorrect", "off");
      }

      // bind events
      EventRuler.on(el, "submit", EventHandlers.submitEvent);
      EventRuler.on(el, "reset", EventHandlers.resetEvent);
      EventRuler.on(el, "blur", EventHandlers.blurEvent);
      EventRuler.on(el, "focus", EventHandlers.focusEvent);
      EventRuler.on(el, "invalid", EventHandlers.invalidEvent);
      EventRuler.on(el, "click", EventHandlers.clickEvent);
      EventRuler.on(el, "mouseleave", EventHandlers.mouseleaveEvent);
      EventRuler.on(el, "mouseenter", EventHandlers.mouseenterEvent);
      EventRuler.on(el, "paste", EventHandlers.pasteEvent);
      EventRuler.on(el, "cut", EventHandlers.cutEvent);
      EventRuler.on(el, "complete", opts.oncomplete);
      EventRuler.on(el, "incomplete", opts.onincomplete);
      EventRuler.on(el, "cleared", opts.oncleared);
      if (opts.inputEventOnly !== true) {
        EventRuler.on(el, "keydown", EventHandlers.keyEvent);
      }
      if (mobile || opts.inputEventOnly) {
        el.removeAttribute("maxLength");
      }
      EventRuler.on(el, "input", EventHandlers.inputFallBackEvent);
      // EventRuler.on(el, "beforeinput", EventHandlers.beforeInputEvent); //https://github.com/w3c/input-events - to implement
    }
    EventRuler.on(el, "setvalue", EventHandlers.setValueEvent);

    // apply mask
    inputmask.applyMaskHook === undefined || inputmask.applyMaskHook();

    getBufferTemplate.call(inputmask).join(""); // initialize the buffer and getmasklength
    inputmask.undoValue = inputmask._valueGet(true);
    const activeElement = (el.inputmask.shadowRoot || el.ownerDocument)
      .activeElement;
    if (
      el.inputmask._valueGet(true) !== "" ||
      opts.clearMaskOnLostFocus === false ||
      activeElement === el
    ) {
      applyInputValue(el, el.inputmask._valueGet(true), opts);
      let buffer = getBuffer.call(inputmask).slice();
      if (isComplete.call(inputmask, buffer) === false) {
        if (opts.clearIncomplete) {
          resetMaskSet.call(inputmask, false);
        }
      }
      if (opts.clearMaskOnLostFocus && activeElement !== el) {
        if (getLastValidPosition.call(inputmask) === -1) {
          buffer = [];
        } else {
          clearOptionalTail.call(inputmask, buffer);
        }
      }
      if (
        opts.clearMaskOnLostFocus === false ||
        (opts.showMaskOnFocus && activeElement === el) ||
        el.inputmask._valueGet(true) !== ""
      ) {
        writeBuffer(el, buffer);
      }
      if (activeElement === el) {
        // position the caret when in focus
        caret.call(
          inputmask,
          el,
          seekNext.call(inputmask, getLastValidPosition.call(inputmask))
        );
      }
    }
  }
}