-- @docclass
UIMiniWindowContainer = extends(UIWidget, 'UIMiniWindowContainer')

function UIMiniWindowContainer.create()
    local container = UIMiniWindowContainer.internalCreate()
    container.scheduledWidgets = {}
    container:setFocusable(false)
    container:setPhantom(true)
    return container
end

-- TODO: connect to window onResize event
-- TODO: try to resize another widget?
-- TODO: try to find another panel?
function UIMiniWindowContainer:fitAll(noRemoveChild)
    if not self:isVisible() then
        return
    end

    if self.ignoreFillAll then
        return
    end

    if not noRemoveChild then
        local children = self:getChildren()
        if #children > 0 then
            noRemoveChild = children[#children]
        else
            return
        end
    end

    local sumHeight = 0
    local children = self:getChildren()
    for i = 1, #children do
        if children[i]:isVisible() then
            sumHeight = sumHeight + children[i]:getHeight()
        end
    end

    local selfHeight = self:getHeight() - (self:getPaddingTop() + self:getPaddingBottom())
    if sumHeight <= selfHeight then
        return
    end

    local removeChildren = {}

    -- try to resize noRemoveChild
    local maximumHeight = selfHeight - (sumHeight - noRemoveChild:getHeight())
    if noRemoveChild:isResizeable() and noRemoveChild:getMinimumHeight() <= maximumHeight then
        sumHeight = sumHeight - noRemoveChild:getHeight() + maximumHeight
        addEvent(function()
            noRemoveChild:setHeight(maximumHeight)
        end)
    end

    -- try to remove no-save widget
    for i = #children, 1, -1 do
        if sumHeight <= selfHeight then
            break
        end

        local child = children[i]
        if child ~= noRemoveChild and not child.save then
            local childHeight = child:getHeight()
            sumHeight = sumHeight - childHeight
            table.insert(removeChildren, child)
        end
    end

    -- try to remove save widget
    for i = #children, 1, -1 do
        if sumHeight <= selfHeight then
            break
        end

        local child = children[i]
        if child ~= noRemoveChild and child:isVisible() then
            local childHeight = child:getHeight()
            sumHeight = sumHeight - childHeight
            table.insert(removeChildren, child)
        end
    end

    -- close widgets
    for i = 1, #removeChildren do
        removeChildren[i]:close()
    end
end

function UIMiniWindowContainer:fits(child, minContentHeight, maxContentHeight)
    if self.ignoreFillAll then
        return 0
    end

    local containerPanel = child:getChildById('contentsPanel')
    local indispensableHeight = containerPanel:getMarginTop() + containerPanel:getMarginBottom() +
        containerPanel:getPaddingTop() + containerPanel:getPaddingBottom()

    local totalHeight = 0
    local children = self:getChildren()
    for i = 1, #children do
        if children[i]:isVisible() then
            totalHeight = totalHeight + children[i]:getHeight()
        end
    end

    local available = self:getHeight() - (self:getPaddingTop() + self:getPaddingBottom()) - totalHeight

    if maxContentHeight > 0 and available >= (maxContentHeight + indispensableHeight) then
        return maxContentHeight + indispensableHeight
    elseif available >= (minContentHeight + indispensableHeight) then
        return available
    else
        return -1
    end
end

function UIMiniWindowContainer:onDrop(widget, mousePos)
    if (self.onlyPhantomDrop and not (widget.moveOnlyToMain)) or (widget.moveOnlyToMain and not (self.onlyPhantomDrop)) then
        return true
    end

    if widget.UIMiniWindowContainer then
        local oldParent = widget:getParent()
        if oldParent == self then
            return true
        end

        if oldParent then
            oldParent:removeChild(widget)
        end

        if widget.movedWidget then
            local index = self:getChildIndex(widget.movedWidget)
            self:insertChild(index + widget.movedIndex, widget)
        else
            self:addChild(widget)
        end

        if widget:getId() == "botWindow" and
            (widget:getParent():getId() == "gameLeftPanel" or widget:getParent():getId() == "gameLeftExtraPanel" or
                widget:getParent():getId() == "gameRightExtraPanel") then
            widget:getParent():setWidth(190)
        end
        self:fitAll(widget)
        return true
    end
end

function UIMiniWindowContainer:swapInsert(widget, index)
    local oldParent = widget:getParent()
    local oldIndex = self:getChildIndex(widget)

    if oldParent == self and oldIndex ~= index then
        local oldWidget = self:getChildByIndex(index)
        if oldWidget then
            self:removeChild(oldWidget)
            self:insertChild(oldIndex, oldWidget)
        end
        self:removeChild(widget)
        self:insertChild(index, widget)
    end
end

function UIMiniWindowContainer:scheduleInsert(widget, index)
    if index - 1 > self:getChildCount() then
        if self.scheduledWidgets[index] then
            pdebug('replacing scheduled widget id ' .. widget:getId())
        end
        self.scheduledWidgets[index] = widget
    else
        local oldParent = widget:getParent()
        if oldParent ~= self then
            if oldParent then
                oldParent:removeChild(widget)
            end
            self:insertChild(index, widget)
        end

        while true do
            local placed = false
            for nIndex, nWidget in pairs(self.scheduledWidgets) do
                if nIndex - 1 <= self:getChildCount() then
                    local nOldParent = nWidget:getParent()
                    if nOldParent ~= self then
                        if nOldParent then
                            nOldParent:removeChild(nWidget)
                        end
                        self:insertChild(nIndex, nWidget)
                    end
                    self.scheduledWidgets[nIndex] = nil
                    placed = true
                    break
                end
            end
            if not placed then
                break
            end
        end
    end
end

function UIMiniWindowContainer:order()
    local children = self:getChildren()
    for i = 1, #children do
        if not children[i].miniLoaded then
            return
        end
    end

    for i = 1, #children do
        if children[i].miniIndex then
            self:swapInsert(children[i], children[i].miniIndex)
        end
    end
end

function UIMiniWindowContainer:saveChildren()
    local children = self:getChildren()
    local ignoreIndex = 0
    for i = 1, #children do
        if children[i].save then
            children[i]:saveParentIndex(self:getId(), i - ignoreIndex)
        else
            ignoreIndex = ignoreIndex + 1
        end
    end
end
