/*

File: Birthdays.js

Abstract: Basic display code and plug-in interfacing for Birthdays

    example widget.

Version: 1.2

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*/

var scrollbar, scrollArea;

var DAY_ERR = "No birthdays today.";

var WEEK_ERR = "No more birthdays this week.";

var MONTH_ERR = "No more birthdays this month.";

var PLUGIN_ERR = "Birthdays plug-in could not be found";

function loaded() {

    // Create buttons

    CreateButton("today", "Today", "leftEnd", showTodaysBirthdays);

    CreateButton("thisWeek", "Week", "mid", showThisWeeksBirthdays);

    CreateButton("thisMonth", "Month", "rightEnd", showThisMonthsBirthdays);

    // Create scroll area

    scrollbar = new AppleVerticalScrollbar(document.getElementById("myScrollBar"));

    scrollArea = new AppleScrollArea(document.getElementById("parentDiv"), scrollbar);

    scrollArea.scrollsHorizontally = false;

    scrollArea.singlepressScrollPixels = 10;

    scrollArea.focus(); // for key control when first loading in Safari

    window.onfocus = function () { scrollArea.focus(); }

    window.onblur = function () { scrollArea.blur(); }

    if (window.widget) {

        widget.onshow = onShow;

    } else {

        onShow();

    }

}

var lastDay;

function onShow() {

    // If it's a new day, refresh the content

    if (lastDay) {

        var today = new Date();

        if ((today.getDate() != lastDay.getDate()) ||

            (today.getMonth() != lastDay.getMonth()) ||

            (today.getYear() != lastDay.getYear())) {

            showTodaysBirthdays();

            lastDay = today;

        }

    } else {

        // No existing date; load initial content

        showTodaysBirthdays();

        lastDay = new Date();

    }

}

var oldControl;

// Switches between the content DIVs.

function showContent(newContent) {

    document.getElementById("errorDiv").style.display = "none";

    clearResults();

    if (newContent) {

        parentDiv.appendChild(newContent);

    }

    // Resize, reposition the scrollthumb

    scrollArea.reveal(newContent);

    scrollArea.refresh();

}

function clearResults() {

    var parentDiv = document.getElementById("parentDiv");

    if (parentDiv.firstChild) {

        parentDiv.removeChild(parentDiv.firstChild);

    }

}

var lastControl = null;

// Easy hack on AppleButton to add state between the three

function updateControl(newControl) {

    if (lastControl) {

        lastControl.object._setPressed(false);

    }

    newControl.object._setPressed(true);

    lastControl = newControl;

}

/* 

 * Plug-In interface functions

 *

 * The birthdays{Today | ThisWeek | ThisMonth} functions

 * return a 2D array of people in Address Book with upcoming

 * birthdays.  Each entry of the array represents a person and

 * is itself an array of three items:

 *  -- First and Last name [0]

 *  -- Birthday in m/y format [1]

 *  -- Address Book GUID [2]

 */

function showTodaysBirthdays() {

    clearResults();

    updateControl(document.getElementById("today"));

    if (window.BirthdaysPlugIn) {

        var bdays = BirthdaysPlugIn.birthdaysToday();

        if (!bdays || bdays.length==0) {

            showError(DAY_ERR);

        } else {

            showContent(buildResultsTable(bdays));

        }

    } else {

        showError(PLUGIN_ERR);

    }

    refreshFunction = showTodaysBirthdays;

}

function showThisWeeksBirthdays(event) {

    clearResults();

    updateControl(document.getElementById("thisWeek"));

    if (window.BirthdaysPlugIn) {

        var bdays = BirthdaysPlugIn.birthdaysThisWeek();

        if (!bdays || bdays.length==0) {

            showError(WEEK_ERR);

        } else {

            showContent(buildResultsTable(bdays));

        }

    } else {

        showError(PLUGIN_ERR);

    }

    refreshFunction = showThisWeeksBirthdays;

}

function showThisMonthsBirthdays(event) {

    clearResults();

    updateControl(document.getElementById("thisMonth"));

    if (window.BirthdaysPlugIn) {

        var bdays = BirthdaysPlugIn.birthdaysThisMonth();

        if (!bdays || bdays.length==0) {

            showError(MONTH_ERR);

        } else {

            showContent(buildResultsTable(bdays));

        }

    } else {

        showError(PLUGIN_ERR);

    }

    refreshFunction = showThisMonthsBirthdays;

}

function showError(error) {

    var errorDiv = document.getElementById("errorDiv");

    if (errorDiv.firstChild) {

        errorDiv.removeChild(errorDiv.firstChild);

    }

    errorDiv.appendChild(document.createTextNode(error));

    errorDiv.style.display = "block";

}

function hideError() {

    document.getElementById("errorDiv").style.display = "block";

}

/*

 * buildResultsTable takes arrays returned from the plug-in and 

 * organizes them in a table for display in our widget

 */

function buildResultsTable(resultsArray) {      

    var resultsTable = document.createElement("div");

    resultsTable.setAttribute("class", "mainContent");

    for (var i=0; i<resultsArray.length; i++) {

        var info = resultsArray[i];

        var rowDiv = document.createElement("div");

        rowDiv.setAttribute("class", "resultsRow row" + (i % 2));

        var link = document.createElement("a");

        link.setAttribute("href", "javascript:widget.openURL('addressbook://" + info[3] + "')");

        var firstName = info[0];

        var lastName = info[1];

        if (firstName.length==0 && lastName.length==0) {

            firstName = "[No";

            lastName = "Name]";

        }

        link.appendChild(document.createTextNode(firstName + " " + lastName + " (" + info[2] + ")"));

        rowDiv.appendChild(link);

        resultsTable.appendChild(rowDiv);

    }

    return resultsTable;

}