/*
 *	constants definitions
 */

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

const COMBATANT_TABLE_ROW = [
'<tr class="combatantRow align-middle" data-true-ini="">\n', //TODO: add data-damage-* attributes with initial damage levels
	'<td class="combatantName" title="Combatant\'s name"></td>\n',
	'<td class="combatantIni text-center" title="Effective initiative (w/ wound penalties)"></td>\n',
	'<td class="text-center combatantDiceAndRea" title="Iniative dice and reaction"><span class="combatantDice"></span>D+<span class="combatantRea"></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/act.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/damage.png" /></button>\n',
			'</div>\n',
		'</div>\n',
	'</td>\n',
'</tr>'].join("");

const DAMAGE_MONITOR_HTML = [
'<table class="bg-light damage-monitor text-center align-middle d-none">\n',
	'<tr>\n',
		'<td><button class="btn btn-sm btn-warning damage-stun active" title="+/-0">0</button></td>\n',
		'<td><button class="btn btn-sm btn-danger damage-physical active" title="+/-0">0</button></td>\n',
	'</tr>\n',
	'<tr><td><button class="btn btn-sm btn-warning damage-stun" title="Light stun damage">L</button></td><td><button class="btn btn-sm btn-danger damage-physical" title="Light physical damage">L</button></td></tr>\n',
	'<tr><td><button class="btn btn-sm btn-warning damage-stun"></button></td><td><button class="btn btn-sm btn-danger damage-physical"></button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun" title="Medium stun damage">M</button></td><td><button class="btn btn-sm btn-danger damage-physical" title="Medium physical damage">M</button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun"></button></td><td><button class="btn btn-sm btn-danger damage-physical"></button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun"></button></td><td><button class="btn btn-sm btn-danger damage-physical"></button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun" title="Severe stun damage">S</button></td><td><button class="btn btn-sm btn-danger damage-physical" title="Severe physical damage">S</button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun"></button></td><td><button class="btn btn-sm btn-danger damage-physical"></button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun"></button></td><td><button class="btn btn-sm btn-danger damage-physical"></button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun"></button></td><td><button class="btn btn-sm btn-danger damage-physical"></button></td></tr>\n',
	'<tr><td><button  class="btn btn-sm btn-warning damage-stun" title="K.O."><img src="img/zzz.png" height="16" /></button></td><td><button class="btn btn-sm btn-danger damage-physical" title="dead"><img src="img/cross.png" height="16"/></button></td></tr>\n',
	'<tr><th colspan="2"><button type)"submit" class="btn btn-sm btn-light remove-button" title="Remove combatant" data-bs-toggle="modal" data-bs-target="#confirmModal"><img src="img/trash.png" /></button></th></tr>\n',
'</table>'].join("");

const STUN_BADGE_HTML = '<sup><span class="badge bg-warning position-absolute translate-middle stun-badge" title="Stun damage niveau"></span></sup>';
const PHYSICAL_BADGE_HTML = '<sub><span class="badge bg-danger position-absolute translate-middle physical-badge" title="Physical damage niveau"></span></sub>';

const CONTEXTUAL_CLASSES = {
	MAX_INI: "table-primary",
	ZERO_INI: "table-secondary",
	REGULAR_INI: "table-success",
	KO_OR_DEAD: "ko-or-dead",
};


/*
 *	helper functions
 */

// roll for initiative with the given reaction and number of ini dice  
function rollForInitiative(dice, rea) {
	let diceRolls = Array.from({length: parseInt(dice)}, () => Math.ceil(Math.random() * 6));	
	return diceRolls.reduce((a, b) => a + b, 0) + 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 = $(a).hasClass(CONTEXTUAL_CLASSES["KO_OR_DEAD"]) ? -1 : parseInt($(a).find(".combatantIni").text()) || 0;
	let tmpB = $(b).hasClass(CONTEXTUAL_CLASSES["KO_OR_DEAD"]) ? -1 : parseInt($(b).find(".combatantIni").text()) || 0;

	// compare ini
	let comparer = tmpB - tmpA;
	if (comparer != 0) {
		return comparer;
	} 
	// tie; compare reaction
	else {
		if ( $(a).find(".combatantRea").text() == "" || $(b).find(".combatantRea").text() == "" ) {
			return 0;
		} else {
			return parseInt($(b).find(".combatantRea").text()) - parseInt($(a).find(".combatantRea").text());
		}
	}
}


// returns a combatant's effective ini value (modified by wound penalties)
function getEffectiveIni(tr) {
	// return -1 if combatant is K.O. or dead
	if ($(tr).hasClass(CONTEXTUAL_CLASSES["KO_OR_DEAD"]) ) {
		return -1;
	}

	// otherwise compute effective ini (true ini minus wound penalties)
	let effectiveIni = parseInt($(tr).data("true-ini")) - DAMAGE_PENALTY[parseInt($(tr).data("damage-stun")) || 0] - DAMAGE_PENALTY[parseInt($(tr).data("damage-physical")) || 0];
	return Math.max(effectiveIni, 0);
}


// add test combatant for testing purposes (duh)
function addTestCombatant() {
	// Eclipse
	$("#addCombatantButton").click();
	$("#combatantModalName").val("Eclipse");
	$("#combatantModalDice").val(3);
	$("#combatantModalRea").val(6);
//	$("#combatantModalIni").val(12);
	setTimeout(function(){
		$("#combatantModalAddOkButton").click();
	},500);
}


/*
 *	Event handler functions
 */

// click handler for act buttons; reduces ini by 10
function handleActButtonClick (e) {

	// reduce ini by 10 but not lower than 0
	let ini = Math.max(parseInt($(e.target).parents(".combatantRow").data("true-ini")) - 10, 0);

	// set new ini value
	$(e.target).parents(".combatantRow").data("true-ini", ini);
	
	// resort table
	sortTable();
}


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

	// restyle modal
	$("#combatantModal .modal-title").text("Add Combatant");
	$("#combatantModalAddOkButton").removeClass("d-none");
	$("#combatantModalEditOkButton").addClass("d-none");

	// 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; basically toggles visibility of table.damage-monitor
function handleDamageButtonClick (e) {

	// get visibility status at click time
	let hiddenAtClick = $(e.target).parents(".damage-dropdown").find(".damage-monitor").hasClass("d-none");

	// hide all damage monitors
	$(".damage-monitor:visible").addClass("d-none");

	// if targeted dm was hidden before, show it now
	if ( hiddenAtClick ) {
		$(e.target).parents(".damage-dropdown").find(".damage-monitor").removeClass("d-none");
	}
	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").addClass("d-none");
	$("#combatantModalEditOkButton").removeClass("d-none");

	// 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.data("true-ini"));

	// show effective ini in modal
	$("#penalty-stun").text(DAMAGE_PENALTY[parseInt($tr.data("damage-stun")) || 0]);
	$("#penalty-physical").text(DAMAGE_PENALTY[parseInt($tr.data("damage-physical")) || 0]);
	
	// mark which row is being edited
	$("#combatantModal").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");
}


function handleNewRoundButton (e) {
	// restyle modal
	$("#confirmModal .modal-title").text("Start new Round");
	$("#confirmModalNewRoundOkButton").removeClass("d-none");
	$("#confirmModalRemoveCombatantOkButton").addClass("d-none");

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


// click handler for remove buttons
function handleRemoveButtonClick (e) {
	// restyle modal
	$("#confirmModal .modal-title").text("Remove Combatant");
	$("#confirmModalRemoveCombatantOkButton").removeClass("d-none");
	$("#confirmModalNewRoundOkButton").addClass("d-none");

	// mark which row is being removed
	$("#confirmModal").data("row", $(".combatantRow").index($(e.target).parents(".combatantRow")));

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



/*
 *	Main functions
 */

// add new combatant 
function addCombatant (e) {

	e.preventDefault();

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

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

	// roll for initiative if necessary
	let ini = $("#combatantModalIni").val().trim();
	ini = (ini != "") ? ini : rollForInitiative($("#combatantModalDice").val(), $("#combatantModalRea").val());

	// construct jQuery object for table row
	let $tr = $($.parseHTML(COMBATANT_TABLE_ROW));
	$tr.find(".damage-dropdown").append($.parseHTML(DAMAGE_MONITOR_HTML));

	// populate table row with values from modal
	$tr.data("true-ini", ini);
	$tr.find(".combatantName").text($("#combatantModalName").val().trim());  
	$tr.find(".combatantDice").text($("#combatantModalDice").val().trim());
	$tr.find(".combatantRea").text($("#combatantModalRea").val().trim());

//TODO: retrieve initial damage levels 

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

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

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

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


// event handler for when any damage monitor is clicked
function applyDamage (e) {

	let $btn = $(e.target);

	// retrieve new damage level and type from button position and "damage-[type]" class
	let damageLevel = $btn.parent().parent().index();
	let damageType = $btn.attr("class").split(" ").filter(function(cls) {
		return cls.substr(0, 7) == "damage-" ? cls : false;
	}).toString().substr(7);

	// add damage level to table row as as data attribute
	$btn.parents("tr.combatantRow").data("damage-" + damageType, damageLevel);

	// select/unselect damage buttons above/below
	$btn.addClass("active");
	$btn.parent().parent().nextAll().find("button.damage-" + damageType).removeClass("active");
	$btn.parent().parent().prevAll().find("button.damage-" + damageType).addClass("active");

	// resort
	sortTable();
}


// edit combatant
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").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.data("true-ini", ini);

	// sort table
	sortTable();

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

// remove combatant
function removeCombatant (e) {
	e.preventDefault();

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

	// remove correct row
	let index = parseInt($("#confirmModal").data("row"));
	$(".combatantRow").eq(index).remove();

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


// start a new combat round
function startNewRound (e) {
	e.preventDefault();

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

	// are there rows at all?
	if ( $(".combatantRow").length == 0 ) {
		return;
	}

	// reset ini values 
	$(".combatantRow").each( function() {
		if ( $(this).find(".combatantDice").text() == "" ) {
			$(this).data("true-ini", 1);
		} else {
			$(this).data("true-ini", rollForInitiative(parseInt($(this).find(".combatantDice").text()), parseInt($(this).find(".combatantRea").text())));
		}
	});

	// resort table
	sortTable();
}


// add contextual classes and sort combatants by ini value
function sortTable() {
	// do some clean up: remove previous classes from rows, disable act buttons, remove effective ini and damage badges
	$(".combatantRow").removeClass(Object.values(CONTEXTUAL_CLASSES).join(" "));
	$(".combatantRow").find(".act-button").prop("disabled", true).attr("aria-disabled", "true");
	$(".combatantIni").empty();

	// mark KO or death with class
	$(".combatantRow").each(function() {
		if ( parseInt($(this).data("damage-stun")) == 10 || parseInt($(this).data("damage-physical")) == 10 ) {
			$(this).addClass(CONTEXTUAL_CLASSES["KO_OR_DEAD"]);
		}
	});

	// compute highest effective ini
	let iniMax = Math.max.apply(null, $.map( $(".combatantRow"), function(tr, i) {
		// write current effective ini to table row
		$(tr).find(".combatantIni").text($(tr).hasClass(CONTEXTUAL_CLASSES["KO_OR_DEAD"]) ? 0 : getEffectiveIni($(tr)));
		return $(tr).find(".combatantIni").text();
	}));

	// add damage badges and contextual classes
	$(".combatantRow").each(function() {
		// damage badges
		if ( $(this).data("damage-stun") && $(this).data("damage-stun") != "0" ) {
			$(this).find(".combatantIni").append($.parseHTML(STUN_BADGE_HTML));
			$(this).find(".stun-badge").append(DAMAGE_NIVEAU[DAMAGE_PENALTY[$(this).data("damage-stun")]]);
		} 
		if ( $(this).data("damage-physical") && $(this).data("damage-physical") != "0" ) {
			$(this).find(".combatantIni").append($.parseHTML(PHYSICAL_BADGE_HTML));
			$(this).find(".physical-badge").append(DAMAGE_NIVEAU[DAMAGE_PENALTY[$(this).data("damage-physical")]]);
		}
		
		// K.O./dead -> don't add anything
		if ( $(this).hasClass(CONTEXTUAL_CLASSES["KO_OR_DEAD"]) ) {
			return true;
		}
		// ini = zero
		if ( parseInt($(this).find(".combatantIni").text()) == 0 ) {
			$(this).addClass(CONTEXTUAL_CLASSES["ZERO_INI"]);
			return true;
		}
		// ini = max and non-zero 
		if ( parseInt($(this).find(".combatantIni").text()) == iniMax && iniMax > 0 ) {
			$(this).addClass(CONTEXTUAL_CLASSES["MAX_INI"]).find(".act-button").prop("disabled", false).removeAttr("aria-disabled");
			return true;
		}
		// everything else
		$(this).addClass(CONTEXTUAL_CLASSES["REGULAR_INI"]);
	})

	// 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;
}


// 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;
}


/*
 *	Initialize document
 */

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

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

	// 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 after click somewhere else
	$("html").on("click", function (e) {
		if ( $(e.target).parents(".damage-monitor").length == 0 ) {
			$(".damage-monitor:visible").addClass("d-none");
		}

	});

	addTestCombatant();
});