local InputContainer = require("ui/widget/container/inputcontainer")
local Notification = require("ui/widget/notification")
local GestureRange = require("ui/gesturerange")
local UIManager = require("ui/uimanager")
local Screen = require("device").screen
local Device = require("device")
local logger = require("logger")
local T = require("ffi/util").template
local _ = require("gettext")

local ReaderFrontLight = InputContainer:new{
    steps = {0,1,1,1,1,2,2,2,3,4,5,6,7,8,9,10},
    gestureScale = Screen:getWidth() * FRONTLIGHT_SENSITIVITY_DECREASE,
}

function ReaderFrontLight:init()
    if Device:isTouchDevice() then
        self.ges_events = {
            Adjust = {
                GestureRange:new{
                    ges = "two_finger_pan",
                    rate = Device.model ~= 'Kobo_phoenix' and 3.0 or nil,
                }
            },
            PanRelease= {
                GestureRange:new{
                    ges = "two_finger_pan_release",
                }
            },
            Swipe = {
                GestureRange:new{
                    ges = "two_finger_swipe",
                }
            },
        }
    end

end

function ReaderFrontLight:onAdjust(arg, ges)
    if not Device:hasFrontlight() then return true end
    local powerd = Device:getPowerDevice()
    logger.dbg("frontlight intensity", powerd:frontlightIntensity())
    local step = math.ceil(#self.steps * ges.distance / self.gestureScale)
    logger.dbg("step = ", step)
    local delta_int = self.steps[step] or self.steps[#self.steps]
    logger.dbg("delta_int = ", delta_int)
    local new_intensity
    if ges.direction == "north" then
        new_intensity = powerd:frontlightIntensity() + delta_int
    elseif ges.direction == "south" then
        new_intensity = powerd:frontlightIntensity() - delta_int
    end
    if new_intensity == nil then return true end
    -- when new_intensity <=0, toggle light off
    if new_intensity <= 0 then
        powerd:turnOffFrontlight()
    else
        powerd:setIntensity(new_intensity)
    end
    if self.view.footer_visible and self.view.footer.settings.frontlight then
        self.view.footer:updateFooter()
    end
    return true
end

function ReaderFrontLight:onShowIntensity()
    if not Device:hasFrontlight() then return true end
    local powerd = Device:getPowerDevice()
    local new_text
    if powerd:isFrontlightOff() then
        new_text = _("Frontlight is off.")
    else
        new_text = T(_("Frontlight intensity is set to %1."), powerd:frontlightIntensity())
    end
    UIManager:show(Notification:new{
        text = new_text,
        timeout = 2,
    })
    return true
end

function ReaderFrontLight:onSwipe(arg, ges)
    if ges.direction == "north" or ges.direction == "south" then
        logger.dbg("onSwipe activated")
        return self:onShowIntensity()
    end
end

function ReaderFrontLight:onPanRelease(arg, ges)
    logger.dbg("onPanRelease activated")
    return self:onShowIntensity()
end

function ReaderFrontLight:onShowFlDialog()
    local FrontLightWidget = require("ui/widget/frontlightwidget")
    UIManager:show(FrontLightWidget:new{})
end

function ReaderFrontLight:close()
    self.fl_dialog:onClose()
    UIManager:close(self.fl_dialog)
end

return ReaderFrontLight