--[[ This script tries to create a rectangular-selection Object mask, using
the same settings as from the equivalent preset. When executed, it creates
a mask that requires updating. After updating, this error will be 
displayed: "Unable to select an object in this photo". ]]

local LrTasks = import "LrTasks"
local catalog = import "LrApplication".activeCatalog ()

local settings = {--table: 1
    Exposure2012 = 4,
    EnableMaskGroupBasedCorrections = true, 
    MaskGroupBasedCorrections = {--table: 2
        [1] = {--table: 3
            CorrectionActive = true, 
            CorrectionAmount = 2, 
            CorrectionID = "DEA95CD2-B5A3-4919-A417-BE8B8916586A", 
            CorrectionMasks = {--table: 4
                [1] = {--table: 5
                    ErrorReason = 0, 
                    Gesture = {--table: 6
                        [1] = {--table: 7
                            MaskActive = true, 
                            MaskBlendMode = 0, 
                            MaskInverted = false, 
                            MaskSyncID = "90DF60099A3A4680952D322868176114", 
                            MaskValue = 1, 
                            Points = {--table: 8
                                [1] = {--table: 9
                                    x = 0.815645, 
                                    y = 0.05768}, 
                                [2] = {--table: 10
                                    x = 0.952747, 
                                    y = 0.054489}, 
                                [3] = {--table: 11
                                    x = 0.814009, 
                                    y = 0.34825}, 
                                [4] = {--table: 12
                                    x = 0.9503, 
                                    y = 0.34719}}, 
                            What = "Mask/Polygon"}}, 
                    MaskActive = true, 
                    MaskBlendMode = 0, 
                    MaskInverted = false, 
                    MaskName = "Object 1", 
                    MaskSubType = 0, 
                    MaskSyncID = "3A055BCB575B42C58C6824C8E762D82A", 
                    MaskValue = 1, 
                    MaskVersion = 1, 
                    ReferencePoint = "0.500000 0.500000", 
                    What = "Mask/Image"}}, 
            CorrectionName = "Mask 1", 
            CorrectionReferenceX = 0.877928, 
            CorrectionReferenceY = 0.23867, 
            CorrectionSyncID = "AFB7C41A81BE4F918E394F0D7BFE3CF4", 
            LocalBlacks2012 = 0, 
            LocalBrightness = 0, 
            LocalClarity = 0, 
            LocalClarity2012 = 0, 
            LocalContrast = 0, 
            LocalContrast2012 = 0, 
            LocalDefringe = 0, 
            LocalDehaze = 0, 
            LocalExposure = 0, 
            LocalExposure2012 = -1, 
            LocalHighlights2012 = 0, 
            LocalHue = 0, 
            LocalLuminanceNoise = 0, 
            LocalMoire = 0, 
            LocalSaturation = 0, 
            LocalShadows2012 = 0, 
            LocalSharpness = 0, 
            LocalTemperature = 0, 
            LocalTexture = 0, 
            LocalTint = 0, 
            LocalToningHue = 240, 
            LocalToningSaturation = 0, 
            LocalWhites2012 = 0, 
            What = "Correction"}}}

LrTasks.startAsyncTask (function ()
    local photo = catalog:getTargetPhoto ()
    catalog:withWriteAccessDo ("Test", function ()
        photo:applyDevelopSettings (settings) end)
    end)