(function () {
    "use strict";

    var currentRow = 0;
    var lastRow = 0;

    function rows() {
        return Array.prototype.slice.call(document.querySelectorAll("#casetable tbody tr"));
    }

    function rowNumber(row) {
        return Number((row.id || "").replace("row", "")) || 0;
    }

    function setActiveRow(row) {
        if (!row) {
            return;
        }
        rows().forEach(function (item) {
            item.classList.remove("rowhover");
        });
        row.classList.add("rowhover");
        currentRow = rowNumber(row);
        lastRow = currentRow;
        row.focus();
    }

    function hiddenValue(row, suffix) {
        var input = document.getElementById(row.id + suffix);
        return input ? input.value : "";
    }

    function submitForm(action, target, formId) {
        if (typeof SubmitForm === "function") {
            SubmitForm(action, target, formId);
            return;
        }
        var form = document.getElementById(formId);
        if (!form) {
            return;
        }
        form.action = action;
        form.target = target;
        form.submit();
    }

    function openRow(row) {
        if (!row) {
            return;
        }
        var uuid = hiddenValue(row, "uuid");
        var portfolioId = hiddenValue(row, "portid");
        if (!uuid || !portfolioId) {
            return;
        }
        document.getElementById("uuid").value = uuid;
        document.getElementById("portlist").value = portfolioId;
        submitForm("caseedit", "_parent", "caseGrid");
    }

    function moveSelection(direction) {
        var allRows = rows();
        if (allRows.length === 0) {
            return;
        }
        var nextIndex = currentRow > 0 ? currentRow - 1 + direction : 0;
        if (nextIndex < 0) {
            nextIndex = allRows.length - 1;
        }
        if (nextIndex >= allRows.length) {
            nextIndex = 0;
        }
        setActiveRow(allRows[nextIndex]);
    }

    function handleKeydown(event) {
        var row = event.target && event.target.closest ? event.target.closest("#casetable tbody tr") : null;
        if (event.key === "Enter" && row) {
            event.preventDefault();
            openRow(row);
            return;
        }
        if (event.key === "ArrowDown") {
            event.preventDefault();
            moveSelection(1);
            return;
        }
        if (event.key === "ArrowUp") {
            event.preventDefault();
            moveSelection(-1);
        }
    }

    function init() {
        rows().forEach(function (row) {
            row.addEventListener("mouseenter", function () {
                setActiveRow(row);
            });
            row.addEventListener("click", function () {
                openRow(row);
            });
        });
        document.addEventListener("keydown", handleKeydown, false);
    }

    window.CygnusEditCases = {
        init: init,
        openRow: openRow
    };

    window.InitPage = init;
}());