require("common.class")
local dim = require("common.dimensions")
local Page = require("components.pager.page")
local ServiceField = require("titlescreen.service.servicefield")

---@class ServicePage: Page
---@field title string|string[]
---@field selectedIndex integer
---@field footer string[]
---@field content ServiceField[]
local ServicePage = {
    SERVICE_DEFAULT_FONT_SIZE = ServiceField.SERVICE_DEFAULT_FONT_SIZE,
    SERVICE_DEFAULT_FONT_FACE = ServiceField.SERVICE_DEFAULT_FONT_FACE,
    SERVICE_DEFAULT_FONT_COLOR = ServiceField.SERVICE_DEFAULT_FONT_COLOR,
    SERVICE_DEFAULT_MARGIN = {92, 128, 0, 56}, --{left, top, right, bottom}
    SERVICE_DEFAULT_SPACING = 4,
    SERVICE_DEFAULT_FOOTER = {
        "BT-A/BT-B = UP/DOWN",
        "START = SELECT",
        "BACK = RETURN TO LAST PAGE"
    }
}

---Create a new ServicePage instance
---
---Inherits from Page
---@return ServicePage
function ServicePage:new(o)
    o = Inherit(self, Page, o)

    o.title = o.title or ""
    o.selectedIndex = o.selectedIndex or 1
    o.footer = o.footer or self.SERVICE_DEFAULT_FOOTER

    return o
end

---Add field to page
---@param field Field
function ServicePage:addField(field)
    field.posX = ServicePage.SERVICE_DEFAULT_MARGIN[1]
    field.posY = ServicePage.SERVICE_DEFAULT_MARGIN[2] + #self.content * (ServicePage.SERVICE_DEFAULT_FONT_SIZE + ServicePage.SERVICE_DEFAULT_SPACING)
    Page.addField(self, field)
end

function ServicePage:drawBackground(deltaTime)
    gfx.BeginPath()
    gfx.FillColor(0, 0, 0)
    gfx.Rect(0, 0, dim.design.width, dim.design.height)
    gfx.Fill()
end

function ServicePage:drawHeader(deltaTime)
    local pageTopTitleMargin = ServicePage.SERVICE_DEFAULT_FONT_SIZE
    local lineHeight = ServicePage.SERVICE_DEFAULT_FONT_SIZE + ServicePage.SERVICE_DEFAULT_SPACING
    gfx.BeginPath()
    gfx.FontSize(ServicePage.SERVICE_DEFAULT_FONT_SIZE)
    gfx.LoadSkinFont(ServicePage.SERVICE_DEFAULT_FONT_FACE)
    gfx.FillColor(table.unpack(ServicePage.SERVICE_DEFAULT_FONT_COLOR))
    gfx.TextAlign(gfx.TEXT_ALIGN_CENTER | gfx.TEXT_ALIGN_TOP)
    if type(self.title) == "table" then
        for index, line in ipairs(self.title) do
            gfx.Text(line, dim.design.width / 2, pageTopTitleMargin + (index-1) * lineHeight)
        end
    elseif type(self.title) == "string" then
        gfx.Text(self.title, dim.design.width / 2, pageTopTitleMargin)
    end
end

function ServicePage:drawFooter(deltaTime)
    local footer = self.content[self.selectedIndex] and self.content[self.selectedIndex].footer or self.footer

    local bottomPageMargin = ServicePage.SERVICE_DEFAULT_MARGIN[4]
    local lineHeight = ServicePage.SERVICE_DEFAULT_FONT_SIZE + ServicePage.SERVICE_DEFAULT_SPACING
    gfx.BeginPath()
    gfx.FontSize(ServicePage.SERVICE_DEFAULT_FONT_SIZE)
    gfx.LoadSkinFont(ServicePage.SERVICE_DEFAULT_FONT_FACE)
    gfx.FillColor(table.unpack(ServicePage.SERVICE_DEFAULT_FONT_COLOR))
    gfx.TextAlign(gfx.TEXT_ALIGN_CENTER | gfx.TEXT_ALIGN_BOTTOM)
    if type(footer) == "table" then
        local yFooterBase = dim.design.height - bottomPageMargin - #footer * lineHeight
        for index, line in ipairs(footer) do
            gfx.Text(line, dim.design.width / 2, yFooterBase + (index-1) * lineHeight)
        end
    elseif type(footer) == "string" then
        local yFooterBase = dim.design.height - bottomPageMargin
        gfx.Text(footer, dim.design.width / 2, yFooterBase)
    end
end

---Handle controller button input
---@param button integer
function ServicePage:handleButtonInput(button)
    local stop_processing = false
    local field = self.content[self.selectedIndex]
    if field and field.handleButtonInput then
        stop_processing = field:handleButtonInput(button)
    end

    -- default behaviour
    if not stop_processing then
        local direction = 0

        if button == game.BUTTON_BCK then
            if self.viewHandler then
                self.viewHandler:back()
            end
            return
        end

        if button == game.BUTTON_BTA then
            direction = -1
        elseif button == game.BUTTON_BTB then
            direction = 1
        end

        self.selectedIndex = (self.selectedIndex - 1 + direction) % #self.content + 1
    end
end

---Handle controller knob input
---@param knob integer
---@param delta number
function ServicePage:handleKnobInput(knob, delta)
    if self.content[self.selectedIndex] and self.content[self.selectedIndex].handleKnobInput then
        self.content[self.selectedIndex].handleKnobInput(knob, delta)
    end
end

return ServicePage