import {
	caret, determineNewCaretPosition,
	getBuffer, getBufferTemplate,
	getLastValidPosition, isMask,
	resetMaskSet,
	seekNext,
	seekPrevious,
	translatePosition
} from "./positioning";
import keyCode from "./keycode.json";
import { iemobile, iphone } from "./environment";
import { handleRemove, isComplete, isSelection, isValid } from "./validation";
import { applyInputValue, checkVal, clearOptionalTail, HandleNativePlaceholder, writeBuffer } from "./inputHandling";
import { getPlaceholder, getTest } from "./validation-tests";

export { EventHandlers };

var EventHandlers = {
	keydownEvent: function (e) {
		const inputmask = this.inputmask, opts = inputmask.opts, $ = inputmask.dependencyLib,
			maskset = inputmask.maskset;

		var input = this,
			$input = $(input),
			k = e.keyCode,
			pos = caret.call(inputmask, input);

		var kdResult = opts.onKeyDown.call(this, e, getBuffer.call(inputmask), pos, opts);
		if (kdResult !== undefined) return kdResult;

		//backspace, delete, and escape get special treatment
		if (k === keyCode.BACKSPACE || k === keyCode.DELETE || (iphone && k === keyCode.BACKSPACE_SAFARI) || (e.ctrlKey && k === keyCode.X && !("oncut" in input))) { //backspace/delete
			e.preventDefault(); //stop default action but allow propagation
			handleRemove.call(inputmask, input, k, pos);
			writeBuffer(input, getBuffer.call(inputmask, true), maskset.p, e, input.inputmask._valueGet() !== getBuffer.call(inputmask).join(""));
		} else if (k === keyCode.END || k === keyCode.PAGE_DOWN) { //when END or PAGE_DOWN pressed set position at lastmatch
			e.preventDefault();
			var caretPos = seekNext.call(inputmask, getLastValidPosition.call(inputmask));
			caret.call(inputmask, input, e.shiftKey ? pos.begin : caretPos, caretPos, true);
		} else if ((k === keyCode.HOME && !e.shiftKey) || k === keyCode.PAGE_UP) { //Home or page_up
			e.preventDefault();
			caret.call(inputmask, input, 0, e.shiftKey ? pos.begin : 0, true);
		} else if (((opts.undoOnEscape && k === keyCode.ESCAPE) || (false && k === keyCode.Z && e.ctrlKey)) && e.altKey !== true) { //escape && undo && #762
			checkVal(input, true, false, inputmask.undoValue.split(""));
			$input.trigger("click");
		} else if (k === keyCode.INSERT && !(e.shiftKey || e.ctrlKey) && inputmask.userOptions.insertMode === undefined) { //insert
			if (!isSelection.call(inputmask, pos)) {
				opts.insertMode = !opts.insertMode;
				caret.call(inputmask, input, pos.begin, pos.begin);
			} else opts.insertMode = !opts.insertMode;
		} else if (opts.tabThrough === true && k === keyCode.TAB) {
			if (e.shiftKey === true) {
				pos.end = seekPrevious.call(inputmask, pos.end, true);
				if (getTest.call(inputmask, pos.end - 1).match.static === true) {
					pos.end--;
				}
				pos.begin = seekPrevious.call(inputmask, pos.end, true);
				if (pos.begin >= 0 && pos.end > 0) {
					e.preventDefault();
					caret.call(inputmask, input, pos.begin, pos.end);
				}
			} else {
				pos.begin = seekNext.call(inputmask, pos.begin, true);
				pos.end = seekNext.call(inputmask, pos.begin, true);
				if (pos.end < maskset.maskLength) pos.end--;
				if (pos.begin <= maskset.maskLength) {
					e.preventDefault();
					caret.call(inputmask, input, pos.begin, pos.end);
				}
			}
		} else if (!e.shiftKey) {
			if (opts.insertModeVisual && opts.insertMode === false) {
				if (k === keyCode.RIGHT) {
					setTimeout(function () {
						var caretPos = caret.call(inputmask, input);
						caret.call(inputmask, input, caretPos.begin);
					}, 0);
				} else if (k === keyCode.LEFT) {
					setTimeout(function () {
						var caretPos = {
							begin: translatePosition.call(inputmask, input.inputmask.caretPos.begin),
							end: translatePosition.call(inputmask, input.inputmask.caretPos.end)
						};
						if (inputmask.isRTL) {
							caret.call(inputmask, input, caretPos.begin + (caretPos.begin === maskset.maskLength ? 0 : 1));
						} else {
							caret.call(inputmask, input, caretPos.begin - (caretPos.begin === 0 ? 0 : 1));
						}
					}, 0);
				}
			}
		}

		inputmask.ignorable = opts.ignorables.includes(k);
	},
	keypressEvent: function (e, checkval, writeOut, strict, ndx) {
		const inputmask = this.inputmask || this, opts = inputmask.opts, $ = inputmask.dependencyLib,
			maskset = inputmask.maskset;

		var input = inputmask.el,
			$input = $(input),
			k = e.keyCode;

		if (checkval !== true && (!(e.ctrlKey && e.altKey) && (e.ctrlKey || e.metaKey || inputmask.ignorable))) {
			if (k === keyCode.ENTER && inputmask.undoValue !== inputmask._valueGet(true)) {
				inputmask.undoValue = inputmask._valueGet(true);
				// e.preventDefault();
				setTimeout(function () {
					$input.trigger("change");
				}, 0);
			}
			inputmask.skipInputEvent = true; //skip the input as otherwise the skipped char could be picked up for validation by the inputfallback
			return true;
		} else if (k) {
			//special treat the decimal separator
			if ((k === 44 || k === 46) && e.location === 3 && opts.radixPoint !== "") k = opts.radixPoint.charCodeAt(0);
			var pos = checkval ? {
				begin: ndx,
				end: ndx
			} : caret.call(inputmask, input),
				forwardPosition, c = String.fromCharCode(k);

			//allow for character substitution
			c = opts.substitutes[c] || c;
			maskset.writeOutBuffer = true;
			var valResult = isValid.call(inputmask, pos, c, strict, undefined, undefined, undefined, checkval);
			if (valResult !== false) {
				resetMaskSet.call(inputmask, true);
				forwardPosition = valResult.caret !== undefined ? valResult.caret : seekNext.call(inputmask, valResult.pos.begin ? valResult.pos.begin : valResult.pos);
				maskset.p = forwardPosition; //needed for checkval
			}

			forwardPosition = ((opts.numericInput && valResult.caret === undefined) ? seekPrevious.call(inputmask, forwardPosition) : forwardPosition);
			if (writeOut !== false) {

				setTimeout(function () {
					opts.onKeyValidation.call(input, k, valResult);
				}, 0);
				if (maskset.writeOutBuffer && valResult !== false) {
					var buffer = getBuffer.call(inputmask);
					writeBuffer(input, buffer, forwardPosition, e, checkval !== true);
				}
			}

			e.preventDefault();

			if (checkval) {
				if (valResult !== false) valResult.forwardPosition = forwardPosition;
				return valResult;
			}
		}
	},
	keyupEvent: function (e) {
		const inputmask = this.inputmask;

		if (inputmask.isComposing && (e.keyCode === keyCode.KEY_229 || e.keyCode === keyCode.ENTER)) {
			inputmask.$el.trigger("input");
		}
	},
	pasteEvent: function (e) {
		const inputmask = this.inputmask, opts = inputmask.opts;

		var input = this,
			inputValue = inputmask._valueGet(true),
			caretPos = caret.call(inputmask, input),
			tempValue;

		if (inputmask.isRTL) {
			tempValue = caretPos.end;
			caretPos.end = translatePosition.call(inputmask, caretPos.begin);
			caretPos.begin = translatePosition.call(inputmask, tempValue);
		}

		var valueBeforeCaret = inputValue.substr(0, caretPos.begin),
			valueAfterCaret = inputValue.substr(caretPos.end, inputValue.length);

		if (valueBeforeCaret == (inputmask.isRTL ? getBufferTemplate.call(inputmask).slice().reverse() : getBufferTemplate.call(inputmask)).slice(0, caretPos.begin).join("")) valueBeforeCaret = "";
		if (valueAfterCaret == (inputmask.isRTL ? getBufferTemplate.call(inputmask).slice().reverse() : getBufferTemplate.call(inputmask)).slice(caretPos.end).join("")) valueAfterCaret = "";

		if (window.clipboardData && window.clipboardData.getData) { // IE
			inputValue = valueBeforeCaret + window.clipboardData.getData("Text") + valueAfterCaret;
		} else if (e.clipboardData && e.clipboardData.getData) {
			inputValue = valueBeforeCaret + e.clipboardData.getData("text/plain") + valueAfterCaret;
		} else {
			return true;
		} //allow native paste event as fallback ~ masking will continue by inputfallback

		var pasteValue = inputValue;
		if (inputmask.isRTL) {
			pasteValue = pasteValue.split("")
			for (let c of getBufferTemplate.call(inputmask)) {
				if (pasteValue[0] === c)
					pasteValue.shift();
			}
			pasteValue = pasteValue.join("");
		}
		if (typeof opts.onBeforePaste === "function") {
			pasteValue = opts.onBeforePaste.call(inputmask, pasteValue, opts);
			if (pasteValue === false) {
				return false;
			}
			if (!pasteValue) {
				pasteValue = inputValue;
			}
		}
		checkVal(input, true, false, pasteValue.toString().split(""), e);
		e.preventDefault()
	},
	inputFallBackEvent: function (e) { //fallback when keypress is not triggered
		const inputmask = this.inputmask, opts = inputmask.opts, $ = inputmask.dependencyLib;

		function ieMobileHandler(input, inputValue, caretPos) {
			if (iemobile) { //iemobile just sets the character at the end althought the caret position is correctly set
				var inputChar = inputValue.replace(getBuffer.call(inputmask).join(""), "");
				if (inputChar.length === 1) {
					var iv = inputValue.split("");
					iv.splice(caretPos.begin, 0, inputChar);
					inputValue = iv.join("");
				}
			}
			return inputValue;
		}

		function analyseChanges(inputValue, buffer, caretPos) {
			var frontPart = inputValue.substr(0, caretPos.begin).split(""),
				backPart = inputValue.substr(caretPos.begin).split(""),
				frontBufferPart = buffer.substr(0, caretPos.begin).split(""),
				backBufferPart = buffer.substr(caretPos.begin).split("");

			var fpl = frontPart.length >= frontBufferPart.length ? frontPart.length : frontBufferPart.length,
				bpl = backPart.length >= backBufferPart.length ? backPart.length : backBufferPart.length,
				bl, i, action = "", data = [], marker = "~", placeholder;

			//align buffers
			while (frontPart.length < fpl) frontPart.push(marker);
			while (frontBufferPart.length < fpl) frontBufferPart.push(marker);
			while (backPart.length < bpl) backPart.unshift(marker);
			while (backBufferPart.length < bpl) backBufferPart.unshift(marker);

			var newBuffer = frontPart.concat(backPart);
			var oldBuffer = frontBufferPart.concat(backBufferPart);

			// console.log("N " + newBuffer);
			// console.log("O " + oldBuffer);

			for (i = 0, bl = newBuffer.length; i < bl; i++) {
				placeholder = getPlaceholder.call(inputmask, translatePosition.call(inputmask, i));
				switch (action) {
					case "insertText":
						if (oldBuffer[i - 1] === newBuffer[i] && caretPos.begin == newBuffer.length - 1) {
							data.push(newBuffer[i]);
						}
						i = bl;
						break;
					case "insertReplacementText":
						if (newBuffer[i] === marker) { //extend selection
							caretPos.end++;
						} else {
							// breakout loop
							i = bl;
						}
						break;
					case "deleteContentBackward":
						if (newBuffer[i] === marker) {
							caretPos.end++;
						} else {
							//breakout loop
							i = bl;
						}
						break;
					default:
						if (newBuffer[i] !== oldBuffer[i]) {
							if ((newBuffer[i + 1] === marker || newBuffer[i + 1] === placeholder || newBuffer[i + 1] === undefined) && ((oldBuffer[i] === placeholder && oldBuffer[i + 1] === marker) || oldBuffer[i] === marker)) {  //basic insert
								action = "insertText";
								data.push(newBuffer[i]);
								caretPos.begin--;
								caretPos.end--;
							} else if (oldBuffer[i + 1] === marker && oldBuffer[i] === newBuffer[i + 1]) { //insert between
								action = "insertText";
								data.push(newBuffer[i]);
								caretPos.begin--;
								caretPos.end--;
							} else if (newBuffer[i] !== placeholder && newBuffer[i] !== marker &&
								(newBuffer[i + 1] === marker || (oldBuffer[i] !== newBuffer[i] && oldBuffer[i + 1] === newBuffer[i + 1] /*single char replacement*/))) { //replace selection
								action = "insertReplacementText";
								data.push(newBuffer[i]);
								caretPos.begin--;
							} else if (newBuffer[i] === marker) {  //delete~backspace
								action = "deleteContentBackward";
								if (isMask.call(inputmask, translatePosition.call(inputmask, i), true) || oldBuffer[i] === opts.radixPoint) caretPos.end++;
							} else {
								i = bl;
							}
						}
						break;
				}
			}

			return {
				action: action,
				data: data,
				caret: caretPos
			};
		}

		var input = this,
			inputValue = input.inputmask._valueGet(true),
			buffer = (inputmask.isRTL ? getBuffer.call(inputmask).slice().reverse() : getBuffer.call(inputmask)).join(""),
			caretPos = caret.call(inputmask, input, undefined, undefined, true);

		if (buffer !== inputValue) {
			inputValue = ieMobileHandler(input, inputValue, caretPos);

			var changes = analyseChanges(inputValue, buffer, caretPos);

			// console.log(JSON.stringify(changes));
			if ((input.inputmask.shadowRoot || input.ownerDocument).activeElement !== input) {
				input.focus();
			}
			writeBuffer(input, getBuffer.call(inputmask));
			caret.call(inputmask, input, caretPos.begin, caretPos.end, true);
			switch (changes.action) {
				case "insertText":
				case "insertReplacementText":
					changes.data.forEach(function (entry, ndx) {
						var keypress = new $.Event("keypress");
						keypress.keyCode = entry.charCodeAt(0);
						inputmask.ignorable = false; //make sure ignorable is ignored ;-)
						EventHandlers.keypressEvent.call(input, keypress);
					});
					setTimeout(function () {  //#2195 trigger keyup to help some other plugins to track changes
						inputmask.$el.trigger("keyup");
					}, 0);
					break;
				case "deleteContentBackward":
					var keydown = new $.Event("keydown");
					keydown.keyCode = keyCode.BACKSPACE;
					EventHandlers.keydownEvent.call(input, keydown);
					break;
				default:
					applyInputValue(input, inputValue);
					break;
			}

			e.preventDefault();
		}
	},
	compositionendEvent: function (e) {
		const inputmask = this.inputmask;

		inputmask.isComposing = false;
		inputmask.$el.trigger("input");
	},
	setValueEvent: function (e) {
		const inputmask = this.inputmask;
		var input = this,
			value = (e && e.detail) ? e.detail[0] : arguments[1];

		if (value === undefined) {
			value = input.inputmask._valueGet(true);
		}

		applyInputValue(input, value);

		if ((e.detail && e.detail[1] !== undefined) || arguments[2] !== undefined) {
			caret.call(inputmask, input, e.detail ? e.detail[1] : arguments[2]);
		}
	}
	,
	focusEvent: function (e) {
		const inputmask = this.inputmask, opts = inputmask.opts;
		var input = this,
			nptValue = input.inputmask._valueGet();

		if (opts.showMaskOnFocus) {
			if (nptValue !== getBuffer.call(inputmask).join("")) {
				writeBuffer(input, getBuffer.call(inputmask), seekNext.call(inputmask, getLastValidPosition.call(inputmask)));
			} /*else if (mouseEnter === false) { //only executed on focus without mouseenter
					caret(input, seekNext(getLastValidPosition()));
				}*/
		}
		if (opts.positionCaretOnTab === true && inputmask.mouseEnter === false && (!isComplete.call(inputmask, getBuffer.call(inputmask)) || getLastValidPosition.call(inputmask) === -1)) {
			EventHandlers.clickEvent.apply(input, [e, true]);
		}
		inputmask.undoValue = inputmask._valueGet(true);
	},
	invalidEvent: function (e) {
		this.inputmask.validationEvent = true;
	},
	mouseleaveEvent: function () {
		const inputmask = this.inputmask, opts = inputmask.opts;

		var input = this;
		inputmask.mouseEnter = false;
		if (opts.clearMaskOnLostFocus && (input.inputmask.shadowRoot || input.ownerDocument).activeElement !== input) {
			HandleNativePlaceholder(input, inputmask.originalPlaceholder);
		}
	},
	clickEvent: function (e, tabbed) {
		const inputmask = this.inputmask;

		var input = this;
		if ((input.inputmask.shadowRoot || input.ownerDocument).activeElement === input) {
			var newCaretPosition = determineNewCaretPosition.call(inputmask, caret.call(inputmask, input), tabbed);
			if (newCaretPosition !== undefined) {
				caret.call(inputmask, input, newCaretPosition);
			}
		}
	},
	cutEvent: function (e) {
		const inputmask = this.inputmask, maskset = inputmask.maskset;

		var input = this,
			pos = caret.call(inputmask, input);

		//correct clipboardData
		var clipData = inputmask.isRTL ? getBuffer.call(inputmask).slice(pos.end, pos.begin) : getBuffer.call(inputmask).slice(pos.begin, pos.end),
			clipDataText = inputmask.isRTL ? clipData.reverse().join("") : clipData.join("");
		if (window.navigator.clipboard) window.navigator.clipboard.writeText(clipDataText);
		else if (window.clipboardData && window.clipboardData.getData) { // IE
			window.clipboardData.setData("Text", clipDataText);
		}
		handleRemove.call(inputmask, input, keyCode.DELETE, pos);
		writeBuffer(input, getBuffer.call(inputmask), maskset.p, e, inputmask.undoValue !== inputmask._valueGet(true));
	},
	blurEvent: function (e) {
		const inputmask = this.inputmask, opts = inputmask.opts, $ = inputmask.dependencyLib;

		var $input = $(this),
			input = this;
		if (input.inputmask) {
			HandleNativePlaceholder(input, inputmask.originalPlaceholder);
			var nptValue = input.inputmask._valueGet(),
				buffer = getBuffer.call(inputmask).slice();

			if (nptValue !== "") {
				if (opts.clearMaskOnLostFocus) {
					if (getLastValidPosition.call(inputmask) === -1 && nptValue === getBufferTemplate.call(inputmask).join("")) {
						buffer = [];
					} else { //clearout optional tail of the mask
						clearOptionalTail.call(inputmask, buffer);
					}
				}
				if (isComplete.call(inputmask, buffer) === false) {
					setTimeout(function () {
						$input.trigger("incomplete");
					}, 0);
					if (opts.clearIncomplete) {
						resetMaskSet.call(inputmask);
						if (opts.clearMaskOnLostFocus) {
							buffer = [];
						} else {
							buffer = getBufferTemplate.call(inputmask).slice();
						}

					}
				}

				writeBuffer(input, buffer, undefined, e);
			}

			if (inputmask.undoValue !== inputmask._valueGet(true)) {
				inputmask.undoValue = inputmask._valueGet(true);
				$input.trigger("change");
			}
		}
	}
	,
	mouseenterEvent: function () {
		const inputmask = this.inputmask, opts = inputmask.opts;

		var input = this;
		inputmask.mouseEnter = true;
		if ((input.inputmask.shadowRoot || input.ownerDocument).activeElement !== input) {
			var bufferTemplate = (inputmask.isRTL ? getBufferTemplate.call(inputmask).slice().reverse() : getBufferTemplate.call(inputmask)).join("");
			if (inputmask.placeholder !== bufferTemplate && input.placeholder !== inputmask.originalPlaceholder) {
				inputmask.originalPlaceholder = input.placeholder;
			}
			if (opts.showMaskOnHover) {
				HandleNativePlaceholder(input, bufferTemplate);
			}
		}
	}
	,
	submitEvent: function () { //trigger change on submit if any
		const inputmask = this.inputmask, opts = inputmask.opts;

		if (inputmask.undoValue !== inputmask._valueGet(true)) {
			inputmask.$el.trigger("change");
		}
		if (/*opts.clearMaskOnLostFocus && */getLastValidPosition.call(inputmask) === -1 && inputmask._valueGet && inputmask._valueGet() === getBufferTemplate.call(inputmask).join("")) {
			inputmask._valueSet(""); //clear masktemplete on submit and still has focus
		}
		if (opts.clearIncomplete && isComplete.call(inputmask, getBuffer.call(inputmask)) === false) {
			inputmask._valueSet("");
		}
		if (opts.removeMaskOnSubmit) {
			inputmask._valueSet(inputmask.unmaskedvalue(), true);
			setTimeout(function () {
				writeBuffer(inputmask.el, getBuffer.call(inputmask));
			}, 0);
		}
	}
	,
	resetEvent: function () {
		const inputmask = this.inputmask;

		inputmask.refreshValue = true; //indicate a forced refresh when there is a call to the value before leaving the triggering event fn
		setTimeout(function () {
			applyInputValue(inputmask.el, inputmask._valueGet(true));
		}, 0);
	}
};
