/*
 *	helper functions
 */

const penalty = [0, 1, 1, 2, 2, 2, 3, 3, 3, 3, 4];
const dmg = ["", "L", "M", "S", "D"];

const damageMonitorHTML = ['<table class="bg-light damage-monitor text-center">\n',
	'<thead>\n',
		'<tr><th title="Stun damage"><img src="img/zzz.png" /></th><th title="Physical Damage"><img src="img/skull.png" /></th></tr>\n',
	'</thead>\n',
	'<tbody>\n',
		'<tr><td class="damage-stun"><button class="btn btn-sm btn-warning align-middle" title="-1">L</button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-1">L</button></td></tr>\n',
		'<tr><td class="damage-stun"><button class="btn btn-sm btn-warning align-middle" title="-1"></button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-1"></button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-2">M</button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-2">M</button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-2"></button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-2"></button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-2"></button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-2"></button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-3">S</button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-3">S</button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-3"></button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-3"></button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-3"></button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-3"></button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="-3"></button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="-3"></button></td></tr>\n',
		'<tr><td class="damage-stun"><button  class="btn btn-sm btn-warning align-middle" title="K.O.">D</button></td><td class="damage-physical"><button class="btn btn-sm btn-danger" title="dead">D</button></td></tr>\n',
	'</tbody>\n',
'</table>'].join("");

const maxIniClass = "max-ini";
const zeroIniClass = "table-secondary";


// 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);
}


// figure out whose action comes first out of two combatants a and b
function whoGoesFirst(a, b) {
	// check for K.O./death
	let tmpA = $(a).hasClass("out-of-commission") ? -1 : parseInt($(a).find(".combatantIni").text()) || 0;
	let tmpB = $(b).hasClass("out-of-commission") ? -1 : parseInt($(b).find(".combatantIni").text()) || 0;

console.log("iniA, iniB are", tmpA, tmpB); 
	// compare ini
	let comparer = tmpB - tmpA;
	if (comparer != 0) {
		return comparer;
	} else
	// tie; compare reaction
	{
		tmpA = parseInt($(a).find(".combatantRea").text()) || 0;
		tmpB = parseInt($(b).find(".combatantRea").text()) || 0
console.log("Reaction values are: ", tmpA, tmpB);
		return tmpB - tmpA;
	}
}


// add contextual classes and sort combatants by ini value
function sortTable() {
	
	// remove previous classes from rows, disable act buttons
	$(".combatantRow").removeClass(maxIniClass + " " + zeroIniClass).find(".act-button").prop("disabled", true).attr("aria-disabled", "true");

	// get ini value for every combatant; set to 0 if K.O./dead
	let iniValues = $.map( $(".combatantIni"), function(td, i) {
		return $(td).parents(".combatantRow").hasClass("out-of-commission") ? 0 : parseInt($(td).text());
	});

	// compute highest ini
	let iniMax = Math.max.apply(null, iniValues);

	// add contextual classes 
	$(".combatantRow").each( function() {
		// K.O./dead -> don't add anything
		if ( $(this).hasClass("out-of-commission") ) {
			return true;
		}		
		// ini = zero
		if ( parseInt($(this).find(".combatantIni").text()) == 0 ) {
			$(this).addClass(zeroIniClass);
		}
		// ini = max and non-zero 
		else if ( parseInt($(this).find(".combatantIni").text()) == iniMax && iniMax > 0 ) {
			$(this).addClass(maxIniClass).find(".act-button").prop("disabled", false).removeAttr("aria-disabled");
		}
	})

	// sort rows and append them in new order
	let $rows = $(".combatantRow").toArray().sort(whoGoesFirst);
	for ( var i = 0; i < $rows.length; i++ ) {
		$("#combatantsTable").append($rows[i]);
	}

	return;
}


// returns a combatant's effective ini value (modified by wound penalties)
function getEffectiveIni(value, dmgLvl1, dmgLvl2) {
	let effectiveIni;

	// was function called with 1 argument (tr jQuery object)?
	if ( arguments.length == 1 && $(value).is("tr.combatantRow") ) {
		let trueIni = parseInt($(value).attr("data-true-ini"));
		let dmgStun = parseInt($(value).attr("data-damage-stun")) || 0;
		let dmgPhysical = parseInt($(value).attr("data-damage-physical")) || 0;
		effectiveIni = trueIni - penalty[dmgStun] - penalty[dmgPhysical];
	}
	// or with 3 arguments (ini and dmg levels)?
	else if ( arguments.length == 3 ) {
		effectiveIni = parseInt(value) - penalty[parseInt(dmgLvl1)] - penalty[parseInt(dmgLvl2)];
	}
	// 
	else {
		return NaN;
	}
	return effectiveIni < 0 ? 0 : effectiveIni;
}


/*
 *	Event handler functions
 */

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

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

	// set new ini value
	$tr.attr("data-true-ini", ini);
	$tr.find(".combatantIni").text(getEffectiveIni($tr));
	
	// 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 damage buttons
function handleDamageButtonClick (e) {
	let display = $(e.target).parents(".damage-dropdown").find(".damage-monitor").css("display");
	$(e.target).parents(".damage-dropdown").find(".damage-monitor").css("display", display == "block" ? "none" : "block");
	return false;
}


// click handler for damage monitor fields
function handleDamageMonitorClick (e) {
	let $btn = $(e.target);
	let $tr = $btn.parents("tr.combatantRow");
	let damageType;
	let otherDamageLevel

	// calculate new damage level and type
	let damageLevel = $btn.parent().parent().index() + 1;
	if ( $btn.parent().hasClass("damage-stun") ) {
		damageType = "stun";
		otherDamageLevel = $tr.attr("data-damage-physical") ? parseInt($tr.attr("data-damage-physical")) : 0;
	} else if ( $btn.parent().hasClass("damage-physical") ) {
		damageType = "physical";
		otherDamageLevel = $tr.attr("data-damage-stun") ? parseInt($tr.attr("data-damage-stun")) : 0;
	} else {
		return false;
	}

	// add damage level to table row as as data attribute
	$tr.attr("data-damage-" + damageType, damageLevel);
	if ( damageLevel == 10 || otherDamageLevel == 10 ) {
		$tr.addClass("out-of-commission");
	} else {
		$tr.removeClass("out-of-commission");
	}
	
	// select/unselect damage boxes 
	$btn.addClass("active");
	$btn.parent().parent().nextAll().find("td.damage-" + damageType + " button").removeClass("active");
	$btn.parent().parent().prevAll().find("td.damage-" + damageType + " button").addClass("active");

	// recalculate effective ini
	$tr.find(".combatantIni").text(getEffectiveIni($tr));	

	// add damage level badges
	if ( $tr.attr("data-damage-stun") && $tr.attr("data-damage-stun") != "0" ) {
		$tr.find(".combatantIni").append('<sup><span class="badge bg-warning position-absolute translate-middle" title="Stun damage level">' + dmg[penalty[$tr.attr("data-damage-stun")]] + '</span></sup>');
	} 
	if ( $tr.attr("data-damage-physical") && $tr.attr("data-damage-physical") != "0" ) {
		$tr.find(".combatantIni").append('<sub><span class="badge bg-danger position-absolute translate-middle">' + dmg[penalty[$tr.attr("data-damage-physical")]] + '<span class="visually-hidden">Physical damage level</span></span></sub>');
	} 

	// resort
	sortTable();
	
//	return false;
}

// 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.attr("data-true-ini"));
	//TODO: show effective ini in modal

	// 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();
	//TODO: retrieve initial damage levels 

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

	// get effective initiative value (modified by wound penalties)
	let effectiveIni = getEffectiveIni(ini, 0, 0);

	// construct jQuery object for table row
	let $tr = $($.parseHTML( [
'<tr class="combatantRow align-middle" data-true-ini="', ini, '">\n', //TODO: add data-damage-* attributes with initial damage levels
	'<td class="combatantName" title="Combatant\'s name">', name, '</td>\n',
	'<td class="combatantIni text-center" title="Effective initiative (w/ wound penalties)">', effectiveIni, '</td>\n',
	'<td class="text-center combatantDiceAndRea" title="Iniative dice and reaction"><span class="combatantDice">', dice, '</span>D+<span class="combatantRea">', rea, '</span></td>\n',
	'<td class="text-end">\n',
		'<div class="btn-group">\n',
			'<button type="button" class="btn btn-light btn-rounded mx-1 p-1 edit-button" title="Edit combatant\'s values"><img src="img/edit.png" /></button>\n',
			'<button type="button" class="btn btn-light btn-rounded mx-1 p-1 act-button" title="Act and reduce ini by 10"><img src="img/check.png" /></button>\n',
			'<div class="damage-dropdown">\n',
				'<button type="button" class="btn btn-light btn-rounded mx-1 p-1 damage-button" title="Take damage"><img src="img/explosion.png" /></button>\n',
				damageMonitorHTML + "\n",
			'</div>\n',
		'</div>\n',
	'</td>\n',
'</tr>'].join("")
	));

//TODO: mark initial damage levels with active class 

	// 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);
	$tr.find("button.damage-button").on("click", handleDamageButtonClick);

	// add handler to table cells (click to edit)
	$tr.find(".combatantName, .combatantIni, .combatantDiceAndRea").on("click", handleEditButtonClick);

	// add handler to damage monitor
	$tr.find(".damage-stun, .damage-physical").on("click", handleDamageMonitorClick);

	// 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.attr("data-true-ini", ini);
	$tr.find(".combatantIni").text(getEffectiveIni($tr));

	// 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 dice = $(this).find(".combatantDice").text();
		if ( dice == "" ) {
			$(this).attr("data-true-ini", "1");
		} else {
			$(this).attr("data-true-ini", rollForInitiative(dice, $(this).find(".combatantRea").text()));
		}
		$(this).find(".combatantIni").text(getEffectiveIni($(this)));
		let effectiveIni = $(this).find(".combatantIni").text();
	});

	// resort table
	sortTable();
}


// add test combatant for testing purposes (duh)
function addTestCombatant() {
	$("#addCombatantButton").click();
	$("#combatantModalName").val("Goon1");
	$("#combatantModalDice").val(2);
	$("#combatantModalRea").val(6);
	$("#combatantModalIni").val(12);
	setTimeout(function(){
		$("#combatantModalAddOkButton").click();
	},500);
}


/*
 *	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("");
	});

	// Hide damage monitors if mouse is clicked outside
	$("html").on("click", function(e) {
		if (! $(e.target).is("td[class*='damage-'] > button") ) {
			$(".damage-monitor:visible").css("display", "none");
		}
	});

	addTestCombatant();

});