MainOS?

-- Checking for required components
local function getComponentAddress(name)
    return component.list(name)() or error("Required " .. name .. " component is missing")
end

local function getComponentProxy(name)
    return component.proxy(getComponentAddress(name))
end

local EEPROMProxy, internetProxy, GPUProxy =
    getComponentProxy("eeprom"),
    getComponentProxy("internet"),
    getComponentProxy("gpu")

-- Binding GPU to screen in case it's not done yet
GPUProxy.bind(getComponentAddress("screen"))
local screenWidth, screenHeight = GPUProxy.getResolution()

local repositoryURL = "https://raw.githubusercontent.com/IgorTimofeev/MineOS/master/"
local installerURL = "Installer/"
local EFIURL = "EFI/Minified.lua"

local installerPath = "/MineOS installer/"
local installerPicturesPath = installerPath .. "Installer/Pictures/"
local OSPath = "/"

local temporaryFilesystemProxy, selectedFilesystemProxy

--------------------------------------------------------------------------------

-- Working with components directly before system libraries are downloaded & initialized
local function centrize(width)
    return math.floor(screenWidth / 2 - width / 2)
end

local function centrizedText(y, color, text)
    GPUProxy.fill(1, y, screenWidth, 1, " ")
    GPUProxy.setForeground(color)
    GPUProxy.set(centrize(#text), y, text)
end

local function title()
    local y = math.floor(screenHeight / 2 - 1)
    centrizedText(y, 0x2D2D2D, "MineOS")

    return y + 2
end

local function status(text, needWait)
    centrizedText(title(), 0x878787, text)

    if needWait then
        repeat
            needWait = computer.pullSignal()
        until needWait == "key_down" or needWait == "touch"
    end
end

local function progress(value)
    local width = 26
    local x, y, part = centrize(width), title(), math.ceil(width * value)

    GPUProxy.setForeground(0x878787)
    GPUProxy.set(x, y, string.rep("─", part))
    GPUProxy.setForeground(0xC3C3C3)
    GPUProxy.set(x + part, y, string.rep("─", width - part))
end

local function filesystemPath(path)
    return path:match("^(.+%/).") or ""
end

local function filesystemName(path)
    return path:match("%/?([^%/]+%/?)$")
end

local function filesystemHideExtension(path)
    return path:match("(.+)%..+") or path
end

local function rawRequest(url, chunkHandler)
    local internetHandle, reason = internetProxy.request(repositoryURL .. url:gsub("([^%w%-%_%.%~])", function(char)
        return string.format("%%%02X", string.byte(char))
    end))

    if internetHandle then
        local chunk, reason
        while true do
            chunk, reason = internetHandle.read(math.huge)

            if chunk then
                chunkHandler(chunk)
            else
                if reason then
                    error("Internet request failed: " .. tostring(reason))
                end

                break
            end
        end

        internetHandle.close()
    else
        error("Connection failed: " .. url)
    end
end

local function request(url)
    local data = ""

    rawRequest(url, function(chunk)
        data = data .. chunk
    end)

    return data
end

local function download(url, path)
    selectedFilesystemProxy.makeDirectory(filesystemPath(path))

    local fileHandle, reason = selectedFilesystemProxy.open(path, "wb")
    if fileHandle then
        rawRequest(url, function(chunk)
            selectedFilesystemProxy.write(fileHandle, chunk)
        end)

        selectedFilesystemProxy.close(fileHandle)
    else
        error("File opening failed: " .. tostring(reason))
    end
end

local function deserialize(text)
    local result, reason = load("return " .. text, "=string")
    if result then
        return result()
    else
        error(reason)
    end
end

-- Clearing screen
GPUProxy.setBackground(0xE1E1E1)
GPUProxy.fill(1, 1, screenWidth, screenHeight, " ")

-- Searching for appropriate temporary filesystem for storing libraries, images, etc
for address in component.list("filesystem") do
    local proxy = component.proxy(address)
    if proxy.spaceTotal() >= 2 * 1024 * 1024 then
        temporaryFilesystemProxy, selectedFilesystemProxy = proxy, proxy
        break
    end
end

-- If there's no suitable HDDs found - then meow
if not temporaryFilesystemProxy then
    status("No appropriate filesystem found", true)
    return
end

-- First, we need a big ass file list with localizations, applications, wallpapers
progress(0)
local files = deserialize(request(installerURL .. "Files.cfg"))

-- After that we could download required libraries for installer from it
for i = 1, #files.installerFiles do
    progress(i / #files.installerFiles)
    download(files.installerFiles[i], installerPath .. files.installerFiles[i])
end

-- Initializing simple package system for loading system libraries
package = {loading = {}, loaded = {}}

function require(module)
    if package.loaded[module] then
        return package.loaded[module]
    elseif package.loading[module] then
        error("already loading " .. module .. ": " .. debug.traceback())
    else
        package.loading[module] = true

        local handle, reason = temporaryFilesystemProxy.open(installerPath .. "Libraries/" .. module .. ".lua", "rb")
        if handle then
            local data, chunk = ""
            repeat
                chunk = temporaryFilesystemProxy.read(handle, math.huge)
                data = data .. (chunk or "")
            until not chunk

            temporaryFilesystemProxy.close(handle)

            local result, reason = load(data, "=" .. module)
            if result then
                package.loaded[module] = result() or true
            else
                error(reason)
            end
        else
            error("File opening failed: " .. tostring(reason))
        end

        package.loading[module] = nil

        return package.loaded[module]
    end
end

-- Initializing system libraries
local filesystem = require("Filesystem")
filesystem.setProxy(temporaryFilesystemProxy)

bit32 = bit32 or require("Bit32")
local image = require("Image")
local text = require("Text")
local number = require("Number")

local screen = require("Screen")
screen.setGPUProxy(GPUProxy)

local GUI = require("GUI")
local system = require("System")
local paths = require("Paths")

--------------------------------------------------------------------------------

-- Creating main UI workspace
local workspace = GUI.workspace()
workspace:addChild(GUI.panel(1, 1, workspace.width, workspace.height, 0x1E1E1E))

-- Main installer window
local window = workspace:addChild(GUI.window(1, 1, 80, 24))
window.localX, window.localY = math.ceil(workspace.width / 2 - window.width / 2), math.ceil(workspace.height / 2 - window.height / 2)
window:addChild(GUI.panel(1, 1, window.width, window.height, 0xE1E1E1))

-- Top menu
local menu = workspace:addChild(GUI.menu(1, 1, workspace.width, 0xF0F0F0, 0x787878, 0x3366CC, 0xE1E1E1))
local installerMenu = menu:addContextMenuItem("MineOS", 0x2D2D2D)
installerMenu:addItem("Shutdown").onTouch = function()
    computer.shutdown()
end
installerMenu:addItem("Reboot").onTouch = function()
    computer.shutdown(true)
end
installerMenu:addSeparator()
installerMenu:addItem("Exit").onTouch = function()
    workspace:stop()
end

-- Main vertical layout
local layout = window:addChild(GUI.layout(1, 1, window.width, window.height - 2, 1, 1))

local stageButtonsLayout = window:addChild(GUI.layout(1, window.height - 1, window.width, 1, 1, 1))
stageButtonsLayout:setDirection(1, 1, GUI.DIRECTION_HORIZONTAL)
stageButtonsLayout:setSpacing(1, 1, 3)

local function loadImage(name)
    return image.load(installerPicturesPath .. name .. ".pic")
end

local function newInput(...)
    return GUI.input(1, 1, 26, 1, 0xF0F0F0, 0x787878, 0xC3C3C3, 0xF0F0F0, 0x878787, "", ...)
end

local function newSwitchAndLabel(width, color, text, state)
    return GUI.switchAndLabel(1, 1, width, 6, color, 0xD2D2D2, 0xF0F0F0, 0xA5A5A5, text .. ":", state)
end

local function addTitle(color, text)
    return layout:addChild(GUI.text(1, 1, color, text))
end

local function addImage(before, after, name)
    if before > 0 then
        layout:addChild(GUI.object(1, 1, 1, before))
    end

    local picture = layout:addChild(GUI.image(1, 1, loadImage(name)))
    picture.height = picture.height + after

    return picture
end

local function addStageButton(text)
    local button = stageButtonsLayout:addChild(GUI.adaptiveRoundedButton(1, 1, 2, 0, 0xC3C3C3, 0x878787, 0xA5A5A5, 0x696969, text))
    button.colors.disabled.background = 0xD2D2D2
    button.colors.disabled.text = 0xB4B4B4

    return button
end

local prevButton = addStageButton("<")
local nextButton = addStageButton(">")

local localization
local stage = 1
local stages = {}

local usernameInput = newInput("")
local passwordInput = newInput("", false, "•")
local passwordSubmitInput = newInput("", false, "•")
local usernamePasswordText = GUI.text(1, 1, 0xCC0040, "")
local passwordSwitchAndLabel = newSwitchAndLabel(26, 0x66DB80, "", false)

local wallpapersSwitchAndLabel = newSwitchAndLabel(30, 0xFF4980, "", true)
local screensaversSwitchAndLabel = newSwitchAndLabel(30, 0xFFB600, "", true)
local applicationsSwitchAndLabel = newSwitchAndLabel(30, 0x33DB80, "", true)
local localizationsSwitchAndLabel = newSwitchAndLabel(30, 0x33B6FF, "", true)

local acceptSwitchAndLabel = newSwitchAndLabel(30, 0x9949FF, "", false)

local localizationComboBox = GUI.comboBox(1, 1, 22, 1, 0xF0F0F0, 0x969696, 0xD2D2D2, 0xB4B4B4)
for i = 1, #files.localizations do
    localizationComboBox:addItem(filesystemHideExtension(filesystemName(files.localizations[i]))).onTouch = function()
        -- Obtaining localization table
        localization = deserialize(request(installerURL .. files.localizations[i]))

        -- Filling widgets with selected localization data
        usernameInput.placeholderText = localization.username
        passwordInput.placeholderText = localization.password
        passwordSubmitInput.placeholderText = localization.submitPassword
        passwordSwitchAndLabel.label.text = localization.withoutPassword
        wallpapersSwitchAndLabel.label.text = localization.wallpapers
        screensaversSwitchAndLabel.label.text = localization.screensavers
        applicationsSwitchAndLabel.label.text = localization.applications
        localizationsSwitchAndLabel.label.text = localization.languages
        acceptSwitchAndLabel.label.text = localization.accept
    end
end

local function addStage(onTouch)
    table.insert(stages, function()
        layout:removeChildren()
        onTouch()
        workspace:draw()
    end)
end

local function loadStage()
    if stage < 1 then
        stage = 1
    elseif stage > #stages then
        stage = #stages
    end

    stages[stage]()
end

local function checkUserInputs()
    local nameEmpty = #usernameInput.text == 0
    local nameVaild = usernameInput.text:match("^%w[%w%s_]+$")
    local passValid = passwordSwitchAndLabel.switch.state or #passwordInput.text == 0 or #passwordSubmitInput.text == 0 or passwordInput.text == passwordSubmitInput.text

    if (nameEmpty or nameVaild) and passValid then
        usernamePasswordText.hidden = true
        nextButton.disabled = nameEmpty or not nameVaild or not passValid
    else
        usernamePasswordText.hidden = false
        nextButton.disabled = true

        if nameVaild then
            usernamePasswordText.text = localization.passwordsArentEqual
        else
            usernamePasswordText.text = localization.usernameInvalid
        end
    end
end

local function checkLicense()
    nextButton.disabled = not acceptSwitchAndLabel.switch.state
end

prevButton.onTouch = function()
    stage = stage - 1
    loadStage()
end

nextButton.onTouch = function()
    stage = stage + 1
    loadStage()
end

acceptSwitchAndLabel.switch.onStateChanged = function()
    checkLicense()
    workspace:draw()
end

passwordSwitchAndLabel.switch.onStateChanged = function()
    passwordInput.hidden = passwordSwitchAndLabel.switch.state
    passwordSubmitInput.hidden = passwordSwitchAndLabel.switch.state
    checkUserInputs()

    workspace:draw()
end

usernameInput.onInputFinished = function()
    checkUserInputs()
    workspace:draw()
end

passwordInput.onInputFinished = usernameInput.onInputFinished
passwordSubmitInput.onInputFinished = usernameInput.onInputFinished

-- Localization selection stage
addStage(function()
    prevButton.disabled = true

    addImage(0, 1, "Languages")
    layout:addChild(localizationComboBox)

    workspace:draw()
    localizationComboBox:getItem(1).onTouch()
end)

-- Filesystem selection stage
addStage(function()
    prevButton.disabled = false
    nextButton.disabled = false

    layout:addChild(GUI.object(1, 1, 1, 1))
    addTitle(0x696969, localization.select)

    local diskLayout = layout:addChild(GUI.layout(1, 1, layout.width, 11, 1, 1))
    diskLayout:setDirection(1, 1, GUI.DIRECTION_HORIZONTAL)
    diskLayout:setSpacing(1, 1, 0)

    local HDDImage = loadImage("HDD")

    local function select(proxy)
        selectedFilesystemProxy = proxy

        for i = 1, #diskLayout.children do
            diskLayout.children[i].children[1].hidden = diskLayout.children[i].proxy ~= selectedFilesystemProxy
        end
    end

    local function updateDisks()
        local function diskEventHandler(workspace, disk, e1)
            if e1 == "touch" then
                select(disk.proxy)
                workspace:draw()
            end
        end

        local function addDisk(proxy, picture, disabled)
            local disk = diskLayout:addChild(GUI.container(1, 1, 14, diskLayout.height))

            local formatContainer = disk:addChild(GUI.container(1, 1, disk.width, disk.height))
            formatContainer:addChild(GUI.panel(1, 1, formatContainer.width, formatContainer.height, 0xD2D2D2))
            formatContainer:addChild(GUI.button(1, formatContainer.height, formatContainer.width, 1, 0xCC4940, 0xE1E1E1, 0x990000, 0xE1E1E1, localization.erase)).onTouch = function()
                local list, path = proxy.list("/")
                for i = 1, #list do
                    path = "/" .. list[i]

                    if proxy.address ~= temporaryFilesystemProxy.address or path ~= installerPath then
                        proxy.remove(path)
                    end
                end

                updateDisks()
            end

            if disabled then
                picture = image.blend(picture, 0xFFFFFF, 0.4)
                disk.disabled = true
            end

            disk:addChild(GUI.image(4, 2, picture))
            disk:addChild(GUI.label(2, 7, disk.width - 2, 1, disabled and 0x969696 or 0x696969, text.limit(proxy.getLabel() or proxy.address, disk.width - 2))):setAlignment(GUI.ALIGNMENT_HORIZONTAL_CENTER, GUI.ALIGNMENT_VERTICAL_TOP)
            disk:addChild(GUI.progressBar(2, 8, disk.width - 2, disabled and 0xCCDBFF or 0x66B6FF, disabled and 0xD2D2D2 or 0xC3C3C3, disabled and 0xC3C3C3 or 0xA5A5A5, math.floor(proxy.spaceUsed() / proxy.spaceTotal() * 100), true, true, "", "% " .. localization.used))

            disk.eventHandler = diskEventHandler
            disk.proxy = proxy
        end

        diskLayout:removeChildren()

        for address in component.list("filesystem") do
            local proxy = component.proxy(address)
            if proxy.spaceTotal() >= 1 * 1024 * 1024 then
                addDisk(
                    proxy,
                    proxy.spaceTotal() < 1 * 1024 * 1024 and floppyImage or HDDImage,
                    proxy.isReadOnly() or proxy.spaceTotal() < 2 * 1024 * 1024
                )
            end
        end

        select(selectedFilesystemProxy)
    end

    updateDisks()
end)

-- User profile setup stage
addStage(function()
    checkUserInputs()

    addImage(0, 0, "User")
    addTitle(0x696969, localization.setup)

    layout:addChild(usernameInput)
    layout:addChild(passwordInput)
    layout:addChild(passwordSubmitInput)
    layout:addChild(usernamePasswordText)
    layout:addChild(passwordSwitchAndLabel)
end)

-- Downloads customization stage
addStage(function()
    nextButton.disabled = false

    addImage(0, 0, "Settings")
    addTitle(0x696969, localization.customize)

    layout:addChild(wallpapersSwitchAndLabel)
    layout:addChild(screensaversSwitchAndLabel)
    layout:addChild(applicationsSwitchAndLabel)
    layout:addChild(localizationsSwitchAndLabel)
end)

-- License acception stage
addStage(function()
    checkLicense()

    local lines = text.wrap({request("LICENSE")}, layout.width - 2)
    local textBox = layout:addChild(GUI.textBox(1, 1, layout.width, layout.height - 3, 0xF0F0F0, 0x696969, lines, 1, 1, 1))

    layout:addChild(acceptSwitchAndLabel)
end)

-- Downloading stage
addStage(function()
    stageButtonsLayout:removeChildren()

    -- Creating user profile
    layout:removeChildren()
    addImage(1, 1, "User")
    addTitle(0x969696, localization.creating)
    workspace:draw()

    -- Renaming if possible
    if not selectedFilesystemProxy.getLabel() then
        selectedFilesystemProxy.setLabel("MineOS HDD")
    end

    local function switchProxy(runnable)
        filesystem.setProxy(selectedFilesystemProxy)
        runnable()
        filesystem.setProxy(temporaryFilesystemProxy)
    end

    -- Creating system paths
    local userSettings, userPaths
    switchProxy(function()
        paths.create(paths.system)
        userSettings, userPaths = system.createUser(
            usernameInput.text,
            localizationComboBox:getItem(localizationComboBox.selectedItem).text,
            not passwordSwitchAndLabel.switch.state and passwordInput.text,
            wallpapersSwitchAndLabel.switch.state,
            screensaversSwitchAndLabel.switch.state
        )
    end)

    -- Flashing EEPROM
    layout:removeChildren()
    addImage(1, 1, "EEPROM")
    addTitle(0x969696, localization.flashing)
    workspace:draw()

    EEPROMProxy.set(request(EFIURL))
    EEPROMProxy.setLabel("MineOS EFI")
    EEPROMProxy.setData(selectedFilesystemProxy.address)

    -- Downloading files
    layout:removeChildren()
    addImage(3, 2, "Downloading")

    local container = layout:addChild(GUI.container(1, 1, layout.width - 20, 2))
    local progressBar = container:addChild(GUI.progressBar(1, 1, container.width, 0x66B6FF, 0xD2D2D2, 0xA5A5A5, 0, true, false))
    local cyka = container:addChild(GUI.label(1, 2, container.width, 1, 0x969696, "")):setAlignment(GUI.ALIGNMENT_HORIZONTAL_CENTER, GUI.ALIGNMENT_VERTICAL_TOP)

    -- Creating final filelist of things to download
    local downloadList = {}

    local function getData(item)
        if type(item) == "table" then
            return item.path, item.id, item.version, item.shortcut
        else
            return item
        end
    end

    local function addToList(state, key)
        if state then
            local selectedLocalization, path, localizationName = localizationComboBox:getItem(localizationComboBox.selectedItem).text

            for i = 1, #files[key] do
                path = getData(files[key][i])

                if filesystem.extension(path) == ".lang" then
                    localizationName = filesystem.hideExtension(filesystem.name(path))

                    if
                        -- If ALL loacalizations need to be downloaded
                        localizationsSwitchAndLabel.switch.state or
                        -- If it's required localization file
                        localizationName == selectedLocalization or
                        -- Downloading English "just in case" for non-english localizations
                        selectedLocalization ~= "English" and localizationName == "English"
                    then
                        table.insert(downloadList, files[key][i])
                    end
                else
                    table.insert(downloadList, files[key][i])
                end
            end
        end
    end

    addToList(true, "required")
    addToList(true, "localizations")
    addToList(applicationsSwitchAndLabel.switch.state, "optional")
    addToList(wallpapersSwitchAndLabel.switch.state, "wallpapers")
    addToList(screensaversSwitchAndLabel.switch.state, "screensavers")

    -- Downloading files from created list
    local versions, path, id, version, shortcut = {}
    for i = 1, #downloadList do
        path, id, version, shortcut = getData(downloadList[i])

        cyka.text = text.limit(localization.installing .. " \"" .. path .. "\"", container.width, "center")
        workspace:draw()

        -- Download file
        download(path, OSPath .. path)

        -- Adding system versions data
        if id then
            versions[id] = {
                path = OSPath .. path,
                version = version or 1,
            }
        end

        -- Create shortcut if possible
        if shortcut then
            switchProxy(function()
                system.createShortcut(
                    userPaths.desktop .. filesystem.hideExtension(filesystem.name(filesystem.path(path))),
                    OSPath .. filesystem.path(path)
                )
            end)
        end

        progressBar.value = math.floor(i / #downloadList * 100)
        workspace:draw()
    end

    -- Saving system versions
    switchProxy(function()
        filesystem.writeTable(paths.system.versions, versions, true)
    end)

    -- Done info
    layout:removeChildren()
    addImage(1, 1, "Done")
    addTitle(0x969696, localization.installed)
    addStageButton(localization.reboot).onTouch = function()
        computer.shutdown(true)
    end
    workspace:draw()

    -- Removing temporary installer directory
    temporaryFilesystemProxy.remove(installerPath)
end)

--------------------------------------------------------------------------------

loadStage()
workspace:start()