local DataTableUtils = require("Utils.DataTableUtils")
local ESlateVisibility = import("ESlateVisibility")
local SlateBlueprintLibrary = import("SlateBlueprintLibrary")
local WidgetLayoutLibrary = import("WidgetLayoutLibrary")



--- @class PreCookCenterWidget
--- @field ImgContainer table
--- @field ImgCookMaterial table
local PreCookCenterWidget = {}

function PreCookCenterWidget:ctor()
    self.mouse_tracks = {}
    self.is_pressed = false
end


function PreCookCenterWidget:OnInitialized()
    self.bHasScriptImplementedTick = true

    self.BtnMain.OnReleased:Add(function()
        -- self.bHasScriptImplementedTick = false
        self.is_pressed = false
        print("release")
    end)
    self.BtnMain.OnPressed:Add(function()
        self.mouse_tracks = {}
        self.is_pressed = true
        -- self.bHasScriptImplementedTick = true
        print("pressed")
    end)
    -- self.BtnMain.OnClicked:Add(function()
    --     print("onclicked")
    -- end)
end

function PreCookCenterWidget:Construct()
    -- self.bHasScriptImplementedTick = true
end

function PreCookCenterWidget:Destruct()

end

function PreCookCenterWidget:SetEmpty()
    self.ImgContainer:SetVisibility(ESlateVisibility.Collapsed)
    self.ImgCookMaterial:SetVisibility(ESlateVisibility.Collapsed)
end

function PreCookCenterWidget:AddContainer(pre_cook_contianer_id)
    local row = DataTableUtils.GetDataTableRow("PreCookItemConfig", pre_cook_contianer_id)
    if not row then return end
    self.ImgContainer:SetBrushFromSoftTexture(row.CenterDisplayResource, true)
    self.ImgContainer:SetVisibility(ESlateVisibility.SelfHitTestInvisible)
end

function PreCookCenterWidget:RemoveContainer()
    self.ImgContainer:SetVisibility(ESlateVisibility.Collapsed)
end

function PreCookCenterWidget:AddCookMaterial(pre_cook_material_id)
    local row = DataTableUtils.GetDataTableRow("PreCookItemConfig", pre_cook_material_id)
    if not row then return end
    self.ImgCookMaterial:SetBrushFromSoftTexture(row.CenterDisplayResource, true)
    self.ImgCookMaterial:SetVisibility(ESlateVisibility.SelfHitTestInvisible)
end


local function UpdateOldMouseTrack(old_mouse_tracks, delta_time)
    local new_mouse_tracks = {}
    -- local new_track = {x=fixed_x, y=fixed_y, remain=1.0}
    for _, track in pairs(old_mouse_tracks) do
        track.remain = track.remain - delta_time
        if track.remain > 0 then
            table.insert(new_mouse_tracks, track)
        end
    end
    return new_mouse_tracks
end

--- 将鼠标的轨迹坐标规范到以起始点到终点所连直线为x轴的坐标系下
local function NormalizeTrackParam(mouse_tracks)

end

--- 根据指定点坐标，求解三次样条参数
local function GetSplineParams(normalize_params)

end

local function UpdateCutMaskByTracks(widget, mouse_tracks)
    local FVector2D = import("Vector2D")
    local FWidgetTransform = import("WidgetTransform")
    if #mouse_tracks < 2 then return end

    local translation, scale = FVector2D(), FVector2D()
    local render_transform = FWidgetTransform()
    local first_point, last_point = mouse_tracks[1], mouse_tracks[#mouse_tracks]
    local delta_x = last_point.X - first_point.X
    local delta_y = last_point.Y - first_point.Y
    local mask_length = (delta_x^2 + delta_y^2)^0.5



    translation.X, translation.Y = first_point.X, first_point.Y
    scale.X, scale.Y = mask_length / 512, 1
    render_transform.Scale = scale
    render_transform.Translation = translation
    render_transform.Angle = (math.atan(delta_y, delta_x) / (2 * math.pi)) * 360
    -- render_transform.Scale = FVector2D(mask_length / 512, 1)
    print(render_transform.Angle, math.atan(delta_y, delta_x))

    widget:SetRenderTransform(render_transform)
--[[

	/** The amount to translate the widget in slate units */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( Delta = "1" ))
	FVector2D Translation;

	/** The scale to apply to the widget */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( UIMin = "-5", UIMax = "5", Delta = "0.05" ))
	FVector2D Scale;

	/** The amount to shear the widget in slate units */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( UIMin = "-89", ClampMin = "-89", UIMax = "89", ClampMax = "89", Delta = "1" ))
	FVector2D Shear;

	/** The angle in degrees to rotate */
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Transform, meta=( UIMin = "-180", UIMax = "180", Delta = "1" ))
	float Angle;

]]

end

function PreCookCenterWidget:Tick(geometry, delta_time)
    local size = SlateBlueprintLibrary.GetLocalSize(geometry)
    local cursor_pos = WidgetLayoutLibrary.GetMousePositionOnViewport(self)
    local left_top = SlateBlueprintLibrary.GetLocalTopLeft(geometry)
    local fixed_x = math.min(math.max(cursor_pos.X - left_top.X, 0), size.X)
    local fixed_y = math.min(math.max(cursor_pos.Y - left_top.Y, 0), size.Y)

    local mouse_tracks = UpdateOldMouseTrack(self.mouse_tracks, delta_time)

    if self.is_pressed then
        table.insert(mouse_tracks, {X=fixed_x, Y=fixed_y, remain=0.5})
    end

    -- 计算样条参数
    local normalize_params = NormalizeTrackParam(mouse_tracks)
    local A, B, C, D = GetSplineParams(normalize_params)  -- Ax^3 + Bx^2 + Cx + D

    -- 计算划痕位置

    UpdateCutMaskByTracks(self.ImgMask, mouse_tracks)

    self.mouse_tracks = mouse_tracks


    -- print(fixed_x, fixed_y, #self.mouse_tracks)
end



-- function PreCookCenterWidget:LuaMouseButtonDown()
--     print("on mouse button down")
-- end

-- function PreCookCenterWidget:LuaMouseButtonUp()
--     print("on mouse button up")
-- end


return Class(nil, nil, PreCookCenterWidget)