/*
 *	helper functions
 */

// roll for initiative with the given reaction and number of ini dice  
function rollForInitiative(dice, rea) {
	let ini = 0;
	for ( let i = 0; i < parseInt(dice); i++ ) {
		roll = Math.floor(Math.random() * 6) + 1;
		ini += roll;
	}
	return ini + parseInt(rea);
}

// sorts the combatants by ini value
function sortTable() {
	// sort rows
	let $rows = $(".combatantRow").toArray().sort(function(a, b) {
		return parseInt($(b).find(".combatantIni").text()) - parseInt($(a).find(".combatantIni").text());
	});

	// append rows in sorted order
	for ( var i = 0; i < $rows.length; i++ ) {
		$("#combatantsTable").append($rows[i]);
	}

	// compute highest ini 
	let iniValues = $.map( $(".combatantIni"), function(td, i) {
		return parseInt($(td).text());
	});
	let iniMax = Math.max.apply(null, iniValues);

	// add contextual classes to rows 
	$(".combatantRow").each( function() {
		// default: remove previous classes, disable act button
		$(this).removeClass("table-primary table-secondary").find(".act-button").prop("disabled", true).attr("aria-disabled", "true");
		// ini is zero: add class
		if ( parseInt($(this).find(".combatantIni").text()) == 0 ) {
			$(this).addClass("table-secondary");
		}
		// ini is max and non-zero: add class, enable act button
		else if ( parseInt($(this).find(".combatantIni").text()) == iniMax && iniMax > 0 ) {
			$(this).addClass("table-primary").find(".act-button").prop("disabled", false).removeAttr("aria-disabled");
		}
	})

	return;
}


/*
 *	Event handler functions
 */

// click handler for act buttons
function handleActButtonClick (e) {
	// find current table row
	let $tr = $(e.target).parents(".combatantRow");
	let ini = $tr.find(".combatantIni").text();

	// reduce ini by 10 but not lower than 0
	ini = Math.max(parseInt(ini) - 10, 0);

	// set new ini value
	$tr.find(".combatantIni").text(ini);
	
	// resort table
	sortTable();
}


// click handler for add buttons
function handleAddButtonClick (e) {

	// restyle modal
	$("#combatantModal .modal-title").text("Add Combatant");
	$("#combatantModalAddOkButton").show();
	$("#combatantModalEditOkButton").hide();

	// add handler for enter key
	$("#combatantModal input[id*='combatantModal']").off("keydown");
	$("#combatantModal input[id*='combatantModal']").on("keydown", function (e) {
		if ( e.which == 13 || e.which == 10 ) {
			addCombatant(e);
		}
	});

	// show modal
	$("#combatantModal").modal("show");
}


// click handler for edit buttons
function handleEditButtonClick (e) {
	// find current table row
	let $tr = $(e.target).parents(".combatantRow");

	// restyle modal
	$("#combatantModal .modal-title").text("Edit Combatant");
	$("#combatantModalAddOkButton").hide();
	$("#combatantModalEditOkButton").show();

	// populate modal with values from row
	$("#combatantModalName").val($tr.find(".combatantName").text());
	$("#combatantModalDice").val($tr.find(".combatantDice").text());
	$("#combatantModalRea").val($tr.find(".combatantRea").text());
	$("#combatantModalIni").val($tr.find(".combatantIni").text());

	// mark which row is being edited
	$("#combatantModal").attr("data-row", $(".combatantRow").index($tr));

	// add handler for enter key
	$("#combatantModal input[id*='combatantModal']").off("keydown");
	$("#combatantModal input[id*='combatantModal']").on("keydown", function (e) {
		if ( e.which == 13 || e.which == 10 ) {
			editCombatant(e);
		}
	});
	
	// show modal
	$("#combatantModal").modal("show");
}


// click handler for remove buttons
function handleRemoveButtonClick (e) {
	// remove table row
	$(e.target).parents(".combatantRow").remove();
}


/*
 *	Validation functions
 */

// validate a combatant row form by checking for all conditions, including regular HTML5 validation
function validateCombatant() {

	// get input elements
	let inputElements = {
		name: $("#combatantModalName").get(0),
		ini: $("#combatantModalIni").get(0),
		dice: $("#combatantModalDice").get(0),
		rea: $("#combatantModalRea").get(0)
	};

	// do standard HTML5 form validation first
	// (makes sure that name is not empty and that all other values are numbers within their individual ranges) 
	let valid = true;
	Object.values(inputElements).forEach(function(input) {
		if ( ! input.reportValidity() ) {
			valid = false;
		}
	})
	if ( ! valid ) {
		return false;
	}

	// now for some custom validation; first we need to get the input values
	let ini = inputElements["ini"].value.trim();
	let dice = inputElements["dice"].value.trim();
	let rea = inputElements["rea"].value.trim();

	// invalidate if ini, dice and rea are all empty
	if ( ini == "" && ( dice == "" || rea == "" ) ) {
		inputElements["ini"].setCustomValidity("Requiring values for ini dice and reaction, or initiative, or all three");
		inputElements["ini"].reportValidity();
		inputElements["ini"].setCustomValidity("");
		return false;
	}

	// invalidate if dice or rea is empty but not both
	if ( ( dice == "" ) != ( rea == "" ) ) {
		inputElements["dice"].setCustomValidity("Values required for both dice and reaction, or none (in which case ini is required)");
		inputElements["dice"].reportValidity();
		inputElements["dice"].setCustomValidity("");
		return false;
	}

	// ok then
	return true;
}


/*
 *	Main functions
 */

// add new combatant 
function addCombatant (e) {

	e.preventDefault();

	// validate form
	if ( ! validateCombatant() ) {
		return false;
	}

	// hide modal
	$("#combatantModal").modal("hide");

	// get values
	let name = $("#combatantModalName").val().trim();
	let ini = $("#combatantModalIni").val().trim();
	let dice =  $("#combatantModalDice").val().trim();
	let rea = $("#combatantModalRea").val().trim();

	// roll for initiative if ini is empty
	ini = (ini != "") ? ini : rollForInitiative(dice, rea);

	// construct jQuery object for table row
	let $tr = $($.parseHTML( [
		'<tr class="combatantRow">\n',
			'<td class="combatantName" title="Combatant\'s name">', name, '</td>\n',
			'<td class="combatantIni text-center" title="Initiative">', ini, '</td>\n',
			'<td>\n',
				'<div>\n',
				'<table class="table table-sm table-borderless diceandrea">\n',
					'<tr>\n',
						'<td class="combatantDice text-end" title="Number of initiative dice">', dice, '</td>\n',
						'<td class="text-center">D+</td>\n',
						'<td class="combatantRea text-start" title="Reaction">', rea, '</td>\n',
					'</tr>\n',
				'</table>\n',
				'</div>\n',
			'</td>\n',
			'<td>\n',
				'<div class="btn-group d-flex">\n',
					'<button type="button" class="btn btn-primary btn-rounded w-50 edit-button" title="Edit combatant\'s values">Edit</button>&nbsp;\n',
					'<button type="button" class="btn btn-warning btn-rounded w-50 act-button" title="Act and reduce ini by 10">-10</button>&nbsp;\n',
					'<button type="button" class="btn btn-danger btn-rounded w-50 remove-button" title="Remove combatant">X</button>\n',
				'</div>\n',
			'</td>\n',
		'</tr>'].join("")
	));

	// add handlers to table row buttons 
	$tr.find("button.edit-button").on("click", handleEditButtonClick);
	$tr.find("button.act-button").on("click", handleActButtonClick);
	$tr.find("button.remove-button").on("click", handleRemoveButtonClick);

	// add handlers to table cells (click to edit)
	$tr.find("[class*='combatant']").on("click", handleEditButtonClick);

	// add row to table and sort
	$("#combatantsTable").append($tr);
	sortTable();
}


// edit combatant values
function editCombatant (e) {
	e.preventDefault();

	// validate form
	if ( ! validateCombatant() ) {
		return false;
	}

	// hide modal
	$("#combatantModal").modal("hide");

	// get values
	let name = $("#combatantModalName").val().trim();
	let ini = $("#combatantModalIni").val().trim();
	let dice =  $("#combatantModalDice").val().trim();
	let rea = $("#combatantModalRea").val().trim();

	// roll for initiative if ini is empty
	ini = (ini != "") ? ini : rollForInitiative(dice, rea);

	// get correct row
	let index = parseInt($("#combatantModal").attr("data-row"));
	$tr = $("tr.combatantRow").eq(index);

	// set new values
	$tr.find(".combatantName").text(name);
	$tr.find(".combatantDice").text(dice);
	$tr.find(".combatantRea").text(rea);
	$tr.find(".combatantIni").text(ini);

	// sort table
	sortTable();

	// clean up
	$("#combatantModal").removeAttr("data-row");
}


// start a new combat round
function newRound() {
	// are there rows at all?
	if ( $(".combatantRow").length == 0 ) {
		return;
	}

	// reset ini values 
	$(".combatantRow").each( function() {
		let $ini = $(this).find(".combatantIni");
		let $dice = $(this).find(".combatantDice");
		if ( $dice.text() == "" ) {
			$ini.text(1);
			$ini.text(1);
		} else {
			$ini.text(rollForInitiative($dice.text(), $(this).find(".combatantRea").text()));
		}
	});

	// resort table
	sortTable();
}


/*
 *	Initialize document
 */

$(document).ready(function(){
	// add event handlers to navbar buttons
	$("#addCombatantButton").on("click", handleAddButtonClick);
	$("#newroundModalOkButton").on("click", newRound);

	// add event handlers to modal buttons
	$("#combatantModalAddOkButton").on("click", addCombatant);
	$("#combatantModalEditOkButton").on("click", editCombatant);

	// always focus name input field when combatant modal appears
	$('#combatantModal').on('shown.bs.modal', function() {
		$('#combatantModalName').focus();
	})

	// always empty input fields when combatant modal disappears
	$("#combatantModal").on('hidden.bs.modal', function (e) {
		$("#combatantModal input[id*='combatantModal']").val("");
	})

});