-- 
-- Project: Facebook Connect sample app
--
-- Date: December 24, 2010
--
-- Version: 1.3
--
-- File name: main.lua
--
-- Author: Ansca Mobile
--
-- Abstract: Presents the Facebook Connect login dialog, and then posts to the user's stream
-- (Also demonstrates the use of external libraries.)
--
-- Demonstrates: webPopup, network, Facebook library
--
-- File dependencies: ui.lua, facebook.lua, json.lua libraries (included)
--
-- Target devices: Simulator and Device
--
-- Limitations: Requires internet access; no error checking if connection fails
--
-- Update History:
--      v1.1            Layout adapted for Android/iPad/iPhone4
--  v1.2                Modified for new Facebook Connect API (from build #243)
--  v1.3                Added buttons to: Post Message, Post Photo, Show Dialog, Logout
--  v1.4                Added  ...{"publish_stream"} .. permissions setting to facebook.login() calls.
 
--
-- Comments:
-- Requires API key and application secret key from Facebook. To begin, log into your Facebook
-- account and add the "Developer" application, from which you can create additional apps.
--
-- Sample code is MIT licensed, see http://developer.anscamobile.com/code/license
-- Copyright (C) 2010 ANSCA Inc. All Rights Reserved.
--
---------------------------------------------------------------------------------------
 
-- Comment out the next line when through debugging your app.
io.output():setvbuf('no')               -- **debug: disable output buffering for Xcode Console **tjn
 
-- Load external library (should be in the same folder as main.lua)
local ui = require("ui")
local facebook = require("facebook")
local json = require("json")
 
display.setStatusBar( display.HiddenStatusBar )
        
-- Facebook Commands
local fbCommand                 -- forward reference
local LOGOUT = 1
local SHOW_DIALOG = 2
local POST_MSG = 3
local POST_PHOTO = 4
local GET_USER_INFO = 5
local GET_PLATFORM_INFO = 6
 
-- Layout Locations
local ButtonOrigY = 175
local ButtonYOffset = 45
local StatusMessageY = 420              -- position of status message
 
local background = display.newImage( "facebook_bkg.png", true ) -- flag overrides large image downscaling
background.x = display.contentWidth / 2
background.y = display.contentHeight / 2
 
-- This function is useful for debugging problems with using FB Connect's web api,
-- e.g. you passed bad parameters to the web api and get a response table back
local function printTable( t, label, level )
        if label then print( label ) end
        level = level or 1
 
        if t then
                for k,v in pairs( t ) do
                        local prefix = ""
                        for i=1,level do
                                prefix = prefix .. "\t"
                        end
 
                        print( prefix .. "[" .. tostring(k) .. "] = " .. tostring(v) )
                        if type( v ) == "table" then
                                print( prefix .. "{" )
                                printTable( v, nil, level + 1 )
                                print( prefix .. "}" )
                        end
                end
        end
end
 
local function createStatusMessage( message, x, y )
        -- Show text, using default bold font of device (Helvetica on iPhone)
        local textObject = display.newText( message, 0, 0, native.systemFontBold, 24 )
        textObject:setTextColor( 255,255,255 )
 
        -- A trick to get text to be centered
        local group = display.newGroup()
        group.x = x
        group.y = y
        group:insert( textObject, true )
 
        -- Insert rounded rect behind textObject
        local r = 10
        local roundedRect = display.newRoundedRect( 0, 0, textObject.contentWidth + 2*r, textObject.contentHeight + 2*r, r )
        roundedRect:setFillColor( 55, 55, 55, 190 )
        group:insert( 1, roundedRect, true )
 
        group.textObject = textObject
        return group
end
 
local statusMessage = createStatusMessage( "   Not connected  ", 0.5*display.contentWidth, StatusMessageY )
 
-- New Facebook Connection listener
--
local function listener( event )
 
--- Debug Event parameters printout --------------------------------------------------
--- Prints Events received up to 20 characters. Prints "..." and total count if longer
---
        print( "Facebook Listener events:" )
        
        local maxStr = 20               -- set maximum string length
        local endStr
        
        for k,v in pairs( event ) do
                if string.len(v) > maxStr then
                        endStr = " ... #" .. tostring(string.len(v)) .. ")"
                else
                        endStr = ")"
                end
                print( "   " .. tostring( k ) .. "(" .. tostring( string.sub(v, 1, maxStr ) ) .. endStr )
        end
--- End of debug Event routine -------------------------------------------------------
 
    print( "event.name", event.name ) -- "fbconnect"
    print( "event.type:", event.type ) -- type is either "session" or "request" or "dialog"
    print( "isError: " .. tostring( event.isError ) )
    print( "didComplete: " .. tostring( event.didComplete) )
-----------------------------------------------------------------------------------------
        -- After a successful login event, send the FB command
        -- Note: If the app is already logged in, we will still get a "login" phase
        --
    if ( "session" == event.type ) then
        -- event.phase is one of: "login", "loginFailed", "loginCancelled", "logout"
                statusMessage.textObject.text = event.phase             -- tjn Added
                
                print( "Session Status: " .. event.phase )
                
                if event.phase ~= "login" then
                        -- Exit if login error
                        return
                end
                
                -- The following displays a Facebook dialog box for posting to your Facebook Wall
                if fbCommand == SHOW_DIALOG then
                        facebook.showDialog( {action="stream.publish"} )
                end
        
                -- Request the Platform information (FB information)
                if fbCommand == GET_PLATFORM_INFO then
                        facebook.request( "platform" )          -- **tjn Displays info about Facebook platform
                end
 
                -- Request the current logged in user's info
                if fbCommand == GET_USER_INFO then
                        facebook.request( "me" )
--                      facebook.request( "me/friends" )                -- Alternate request
                end
 
                -- This code posts a photo image to your Facebook Wall
                --
                if fbCommand == POST_PHOTO then
                        local attachment = {
                                name = "Developing a Facebook Connect app using the Corona SDK!",
                                link = "http://developer.anscamobile.com/forum",
                                caption = "Link caption",
                                description = "Corona SDK for developing iOS and Android apps with the same code base.",
                                picture = "http://developer.anscamobile.com/demo/Corona90x90.png",
                                actions = json.encode( { { name = "Learn More", link = "http://anscamobile.com" } } )
                        }
                
                        facebook.request( "me/feed", "POST", attachment )               -- posting the photo
                end
                
                -- This code posts a message to your Facebook Wall
                if fbCommand == POST_MSG then
                        local time = os.date("*t")
                        local postMsg = {
                                message = "Posting from Corona SDK! " ..
                                        os.date("%A, %B %e")  .. ", " .. time.hour .. ":"
                                        .. time.min .. "." .. time.sec
                        }
                
                        facebook.request( "me/feed", "POST", postMsg )          -- posting the message
                end
-----------------------------------------------------------------------------------------
 
    elseif ( "request" == event.type ) then
        -- event.response is a JSON object from the FB server
        local response = event.response
        
                if ( not event.isError ) then
                response = json.decode( event.response )
                
                if fbCommand == GET_USER_INFO then
                                statusMessage.textObject.text = response.name
                                printTable( response, "User Info", 3 )
                                print( "name", response.name )
                                
                        elseif fbCommand == POST_PHOTO then
                                printTable( response, "photo", 3 )
                                statusMessage.textObject.text = "Photo Posted"
                                                        
                        elseif fbCommand == POST_MSG then
                                printTable( response, "message", 3 )
                                statusMessage.textObject.text = "Message Posted"
                                
                        else
                                -- Unknown command response
                                print( "Unknown command response" )
                                statusMessage.textObject.text = "Unknown ?"
                        end
--[[
                        -- Display table of friends (not used at this time) ** Currently not used **
                        local friends = {}
                        local data = response.data
                        for i=1,#data do
                                local name = data[i].name
                                table.insert( friends, name )
                        end
 
                        local topBoundary = display.screenOriginY + 40
                        local bottomBoundary = display.screenOriginY + 0
                        
                        -- create the list of items
                        myList = tableView.newList{
                                data=friends, 
                                default="listItemBg.png",
                                --default="listItemBg_white.png",
                                over="listItemBg_over.png",
--                              onRelease=listButtonRelease,
                                top=topBoundary,
                                bottom=bottomBoundary,
                        }
--]]
        else
                -- Post Failed
                        statusMessage.textObject.text = "Post failed"
                        printTable( event.response, "Post Failed Response", 3 )
                end
                
        elseif ( "dialog" == event.type ) then
                -- showDialog response
                --
                print( "dialog response:", event.response )
                statusMessage.textObject.text = event.response
    end
end
 
---------------------------------------------------------------------------------------------------
-- NOTE: To create a mobile app that interacts with Facebook Connect, first log into Facebook
-- and create a new Facebook application. That will give you the "API key" and "application secret" 
-- that should be used in the following lines:
 
local appId  = nil      -- Add  your App ID here
local apiKey = nil      -- Not needed at this time
---------------------------------------------------------------------------------------------------
 
 
-- NOTE: You must provide a valid application id provided from Facebook
 
if ( appId ) then
 
        -- ***
        -- ************************ Buttons Functions ********************************
        -- ***
        local function postPhoto_onRelease( event )
                -- call the login method of the FB session object, passing in a handler
                -- to be called upon successful login.
                fbCommand = POST_PHOTO
                facebook.login( appId, listener,  {"publish_stream"}  )
        end
        
        local function getInfo_onRelease( event )
                -- call the login method of the FB session object, passing in a handler
                -- to be called upon successful login.
                fbCommand = GET_USER_INFO
                facebook.login( appId, listener, {"publish_stream"}  )
        end
        
        local function postMsg_onRelease( event )
                -- call the login method of the FB session object, passing in a handler
                -- to be called upon successful login.
                fbCommand = POST_MSG
                facebook.login( appId, listener, {"publish_stream"} )
        end
        
        local function showDialog_onRelease( event )
                -- call the login method of the FB session object, passing in a handler
                -- to be called upon successful login.
                fbCommand = SHOW_DIALOG
                facebook.login( appId, listener, {"publish_stream"}  )
        end
        
        local function logOut_onRelease( event )
                -- call the login method of the FB session object, passing in a handler
                -- to be called upon successful login.
                fbCommand = LOGOUT
                facebook.logout()
        end
 
        -- ***
        -- ************************ Create Buttons ********************************
        -- ***
        
        -- "Post Photo with Facebook" button
        local fbButton = ui.newButton{
                default = "fbButton184.png",
                over = "fbButtonOver184.png",
                onRelease = postPhoto_onRelease,
                text = "  Post Photo",
                x = 160,
                y = ButtonOrigY
        }
        
        -- "Post Message with Facebook" button
        local fbButton = ui.newButton{
                default = "fbButton184.png",
                over = "fbButtonOver184.png",
                onRelease = postMsg_onRelease,
                text = "Post Msg",
                x = 160,
                y = ButtonOrigY + ButtonYOffset * 1
        }
        
        -- "Show Dialog Info with Facebook" button
        local fbButton = ui.newButton{
                default = "fbButton184.png",
                over = "fbButtonOver184.png",
                onRelease = showDialog_onRelease,
                text = "    Show Dialog",
                x = 160,
                y = ButtonOrigY + ButtonYOffset * 2
        }
        
        -- "Get User Info with Facebook" button
        local fbButton = ui.newButton{
                default = "fbButton184.png",
                over = "fbButtonOver184.png",
                onRelease = getInfo_onRelease,
                text = "Get User",
                x = 160,
                y = ButtonOrigY + ButtonYOffset * 3
        }
        
        -- "Logout with Facebook" button
        local fbButton = ui.newButton{
                default = "fbButton184.png",
                over = "fbButtonOver184.png",
                onRelease = logOut_onRelease,
                text = "Logout",
                x = 160,
                y = ButtonOrigY + ButtonYOffset * 4
        }
else
        -- Handle the response from showAlert dialog boxbox
        --
        local function onComplete( event )
                if event.index == 1 then
                        system.openURL( "http://developers.facebook.com/get_started.php" )
                end
        end
 
        native.showAlert( "Error", "To develop for Facebook Connect, you need to get an API key and application secret. This is available from Facebook's website.",
                { "Learn More", "Cancel" }, onComplete )
end