var g_tolItem = 0;

document.addEventListener('DOMContentLoaded', function () {
    console.log('我被执行了！');
    chrome.runtime.sendMessage({ from: "content_scripts" }, function (response) {
        console.log(response);
    });
});

function sleep(time) {
    return new Promise((resolve) => setTimeout(resolve, time));
}

function queryUnReadItems() {
    var doc = document.getElementById('document-filter');

    for (var i = 0; i < doc.childElementCount; i++) {
        var ctx = doc.children[i].innerText.split(" ");
        if (ctx.length > 1 && ctx[0] == "我的待阅") {
            return { index: i, nItem: parseInt(ctx[1], 10) };
        }
    }

    return 0;
}

function flushUnReadList(id, nItems) {
    var doc = document.getElementById('document-filter');

    doc.children[id].firstElementChild.click();
    var cob = document.getElementById('listpagination');
    var selectObj = cob.children[1].firstElementChild;
    console.log("Parent[1] = %o", cob.children[1]);
    console.log("Parent[2] = %o", cob.children[1].firstElementChild);

    var n = 0;// nItems / 10;

    if (n == 2) {
        selectObj.value = "20";
    } else if (n == 3) {
        selectObj.value = "30";
    } else if (n >= 4) {
        selectObj.value = "40";
    } else {
        selectObj.value = "10";
    }

    selectObj.dispatchEvent(new Event('change', { 'bubbles': true }));
    console.log("Refresh Web Pages");
}

function getUnReadList() {
    var doc = document.getElementsByClassName('tab-pane active');

    for (var i = 0; i < doc.length; i++) {
          if (doc[i].id == 'toread') {
            var tbl = doc[i].children[0].children[0].children[1];
            for (var j = 0; j < tbl.childElementCount; j++) {
                if (tbl.children[j].className != "request") {
                    /* console.log("item(%d): %s   %s", j,
                        tbl.children[j].children[0].innerText,
                        tbl.children[j].children[1].firstElementChild.href); */
                    //tbl.children[j].children[1].firstElementChild.click();
                    chrome.runtime.sendMessage({
                        from: "content_scripts",
                        action: 'create_table',
                        url: tbl.children[j].children[1].firstElementChild.href
                    }, function (response) {
                        g_tolItem = g_tolItem + 1;
                        console.log(response);
                    });

                    if (j >= 2) {
                        return j;
                    }
                }
            }

            return 0;
        }
    }

    return 0;
}

chrome.extension.onMessage.addListener(
    function (request, sender, sendResponse) {
        var msg = "Recv Commond [" + request.action + "] from (" + request.from + ")";
        sendResponse(msg);
        console.log(msg);
        if (request.action == "run_cmd") {
            if(g_tolItem >= 4) {
                console.log("------------ Cancel do");
                return;
            }
            for (var i = 0; i < 10; i++) {
                var obj = queryUnReadItems();

                if (obj.nItem > 0) {
                    var msg = "待阅处理： [" + obj.nItem + "] 条";
                    console.log(msg);
                    flushUnReadList(obj.index, obj.nItem);

                    sleep(3000).then(() => {
                        var j = 0, n = 0;
                        do {
                            n = getUnReadList();
                            console.log("Retry:%d --> %d", j++, n);
                        } while (n == 0);

                        console.log("Finish getUnReadList");
                        return;
                    });

                    return;
                }

                sleep(1000).then(() => {
                    console.log("第" + i + "次尝试获取待阅消息条数");
                });
            }

            console.log("没有待阅消息需要处理");
        } else if (request.action == "get_items") {
            getUnReadList();
        } else if (request.action == "tab_info") {
            chrome.runtime.sendMessage({ from: "content_scripts", to: "background", action: 'run_table' }, function (response) {
                console.log(response);
            });
        } else if (request.action == "read_page") {
            sendResponse("");
            var rd = document.getElementById('toRead');
            rd.click();
            console.log("Click Button:%o", rd);
            chrome.runtime.sendMessage({ from: "content_scripts", to: "background", action: 'click_table', tabId: request.tabId }, function (response) {
                console.log(response);
            });
        }
    }
);