describe("Readerview module", function()
    local DocumentRegistry, Blitbuffer, ReaderUI, UIManager

    setup(function()
        require("commonrequire")
        DocumentRegistry = require("document/documentregistry")
        Blitbuffer = require("ffi/blitbuffer")
        ReaderUI = require("apps/reader/readerui")
        UIManager = require("ui/uimanager")
    end)

    it("should stop hinting on document close event", function()
        local sample_epub = "spec/front/unit/data/leaves.epub"
        local readerui = ReaderUI:new{
            document = DocumentRegistry:openDocument(sample_epub),
        }
        for i = #UIManager._task_queue, 1, -1 do
            local task = UIManager._task_queue[i]
            if task.action == readerui.view.emitHintPageEvent then
                error("UIManager's task queue should be emtpy.")
            end
        end

        local bb = Blitbuffer.new(1000, 1000)
        readerui.view:drawSinglePage(bb, 0, 0)

        local found = false
        for i = #UIManager._task_queue, 1, -1 do
            local task = UIManager._task_queue[i]
            if task.action == readerui.view.emitHintPageEvent then
                found = true
            end
        end
        assert.is.truthy(found)

        readerui:onClose()

        assert.is.falsy(readerui.view.hinting)
        for i = #UIManager._task_queue, 1, -1 do
            local task = UIManager._task_queue[i]
            if task.action == readerui.view.emitHintPageEvent then
                error("UIManager's task queue should be emtpy.")
            end
        end
    end)

    it("should return and restore view context", function()
        local sample_pdf = "spec/front/unit/data/2col.pdf"
        local readerui = ReaderUI:new{
            document = DocumentRegistry:openDocument(sample_pdf),
        }
        local view = readerui.view
        local ctx = view:getViewContext()
        local zoom = ctx[1].zoom
        ctx[1].zoom = nil
        local saved_ctx = {
            {
                page = 1,
                pos = 0,
                gamma = 1,
                offset = {
                    x = 17, y = 0,
                    h = 0, w = 0,
                },
                rotation = 0,
            },
            -- visible_area
            {
                x = 0, y = 0,
                h = 800, w = 566,
            },
            -- page_area
            {
                x = 0, y = 0,
                h = 800, w = 566,
            },
        }
        assert.are.same(ctx, saved_ctx)
        assertAlmostEquals(zoom, 0.95011876484561, 0.0001)

        assert.is.same(view.state.page, 1)
        assert.is.same(view.visible_area.x, 0)
        assert.is.same(view.visible_area.y, 0)
        saved_ctx[1].page = 2
        saved_ctx[1].zoom = zoom
        saved_ctx[2].y = 10
        view:restoreViewContext(saved_ctx)
        assert.is.same(view.state.page, 2)
        assert.is.same(view.visible_area.x, 0)
        assert.is.same(view.visible_area.y, 10)
    end)
end)
