package fallbackIcons

import "bytes"
import "image"
import _ "embed"
import _ "image/png"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/data"
import "git.tebibyte.media/tomo/tomo/event"
import "git.tebibyte.media/tomo/tomo/canvas"
import "git.tebibyte.media/tomo/backend/style"
import "git.tebibyte.media/tomo/nasin/internal/util"

//go:embed assets/icons-small.png
var atlasSmallBytes []byte
//go:embed assets/icons-large.png
var atlasLargeBytes []byte

const (
	iconApplicationXGeneric    = tomo.Icon("application/x-generic")
	iconApplicationXExecutable = tomo.Icon("application/x-executable")
	iconAudioXGeneric          = tomo.Icon("audio/x-generic")
	iconFontXGeneric           = tomo.Icon("font/x-generic")
	iconImageXGeneric          = tomo.Icon("image/x-generic")
	iconModelXGeneric          = tomo.Icon("model/x-generic")
	iconPackageXGeneric        = tomo.Icon("package/x-generic")
	iconTextXGeneric           = tomo.Icon("text/x-generic")
	iconTextHtml               = tomo.Icon("text/html")
	iconTextXGenericTemplate   = tomo.Icon("text/x-generic-template")
	iconTextXScript            = tomo.Icon("text/x-script")
	iconVideoXGeneric          = tomo.Icon("video/x-generic")
	iconXOfficeAddressBook     = tomo.Icon("x-office-address-book")
	iconXOfficeCalendar        = tomo.Icon("x-office-calendar")
	iconXOfficeDocument        = tomo.Icon("x-office-document")
	iconXOfficePresentation    = tomo.Icon("x-office-presentation")
	iconXOfficeSpreadsheet     = tomo.Icon("x-office-spreadsheet")
)

func generateSource (data []byte, width int) (canvas.TextureCloser, map[tomo.Icon] canvas.Texture) {
	atlasImage, _, err := image.Decode(bytes.NewReader(data))
	if err != nil { panic(err) }
	atlasTexture := tomo.NewTexture(atlasImage)

	source := make(map[tomo.Icon] canvas.Texture)
	x := 0
	y := 0
	
	row := func () {
		x = 0
		y ++
	}
	col := func (id tomo.Icon) {
		source[id] = atlasTexture.SubTexture(image.Rect (
			x * width,
			y * width,
			(x + 1) * width,
			(y + 1) * width))
		x++
	}

	col(tomo.IconUnknown)
	col(iconApplicationXGeneric)
	col(iconApplicationXExecutable)
	col(iconAudioXGeneric)
	col(iconFontXGeneric)
	col(iconImageXGeneric)
	col(iconModelXGeneric)
	col(iconPackageXGeneric)
	col(iconTextXGeneric)
	col(iconTextHtml)
	col(iconTextXGenericTemplate)
	col(iconTextXScript)
	col(iconVideoXGeneric)
	col(iconXOfficeAddressBook)
	col(iconXOfficeCalendar)
	col(iconXOfficeDocument)
	col(iconXOfficePresentation)
	col(iconXOfficeSpreadsheet)

	row()
	// actions
	col(tomo.IconAddressBookNew)
	col(tomo.IconApplicationExit)
	col(tomo.IconAppointmentNew)
	col(tomo.IconCallStart)
	col(tomo.IconCallStop)
	col(tomo.IconContactNew)
	// actions: dialog
	col(tomo.IconDialogOkay)
	col(tomo.IconDialogCancel)
	// actions: edit
	col(tomo.IconEditClear)
	col(tomo.IconEditCopy)
	col(tomo.IconEditCut)
	col(tomo.IconEditDelete)
	col(tomo.IconEditFind)
	col(tomo.IconEditFindReplace)
	col(tomo.IconEditPaste)
	col(tomo.IconEditRedo)
	col(tomo.IconEditSelectAll)
	col(tomo.IconEditUndo)
	// actions: file
	col(tomo.IconFileNew)
	col(tomo.IconDirectoryNew)
	col(tomo.IconFileOpen)
	col(tomo.IconFileOpenRecent)
	col(tomo.IconFilePageSetup)
	col(tomo.IconFilePrint)
	col(tomo.IconFilePrintPreview)
	col(tomo.IconFilePermissions)
	col(tomo.IconFileProperties)
	col(tomo.IconFileRename)
	col(tomo.IconFileRevert)
	col(tomo.IconFileSave)
	col(tomo.IconFileSaveAs)
	col(tomo.IconFileSend)

	row()
	// actions: format
	col(tomo.IconFormatIndentLess)
	col(tomo.IconFormatIndentMore)
	col(tomo.IconFormatAlignCenter)
	col(tomo.IconFormatAlignEven)
	col(tomo.IconFormatAlignLeft)
	col(tomo.IconFormatAlignRight)
	col(tomo.IconFormatTextDirectionLtr)
	col(tomo.IconFormatTextDirectionRtl)
	col(tomo.IconFormatTextBold)
	col(tomo.IconFormatTextItalic)
	col(tomo.IconFormatTextUnderline)
	col(tomo.IconFormatTextStrikethrough)
	// actions: go
	col(tomo.IconGoBottom)
	col(tomo.IconGoDown)
	col(tomo.IconGoFirst)
	col(tomo.IconGoHome)
	col(tomo.IconGoJump)
	col(tomo.IconGoLast)
	col(tomo.IconGoNext)
	col(tomo.IconGoPrevious)
	col(tomo.IconGoTop)
	col(tomo.IconGoUp)
	// actions: help
	col(tomo.IconHelpAbout)
	col(tomo.IconHelpContents)
	col(tomo.IconHelpFaq)
	// actions: insert
	col(tomo.IconInsertImage)
	col(tomo.IconInsertLink)
	col(tomo.IconInsertObject)
	col(tomo.IconInsertText)

	row()
	// actions: list
	col(tomo.IconListAdd)
	col(tomo.IconListRemove)
	col(tomo.IconListChoose)
	col(tomo.IconListExpand)
	col(tomo.IconListContract)

	row()
	// actions: mail
	col(tomo.IconMailForward)
	col(tomo.IconMailMarkImportant)
	col(tomo.IconMailMarkJunk)
	col(tomo.IconMailMarkNotJunk)
	col(tomo.IconMailMarkRead)
	col(tomo.IconMailMarkUnread)
	col(tomo.IconMailMessageNew)
	col(tomo.IconMailReplyAll)
	col(tomo.IconMailReplySender)
	col(tomo.IconMailSend)
	col(tomo.IconMailReceive)
	// actions: media
	col(tomo.IconMediaEject)
	col(tomo.IconMediaPlaybackPause)
	col(tomo.IconMediaPlaybackStart)
	col(tomo.IconMediaPlaybackStop)
	col(tomo.IconMediaRecord)
	col(tomo.IconMediaSeekBackward)
	col(tomo.IconMediaSeekForward)
	col(tomo.IconMediaSkipBackward)
	col(tomo.IconMediaSkipForward)
	// actions: object
	col(tomo.IconObjectFlipHorizontal)
	col(tomo.IconObjectFlipVertical)
	col(tomo.IconObjectRotateLeft)
	col(tomo.IconObjectRotateRight)
	// actions: process
	col(tomo.IconProcessStop)
	// actions: system
	col(tomo.IconSystemLockScreen)
	col(tomo.IconSystemLogOut)
	col(tomo.IconSystemRun)
	col(tomo.IconSystemSearch)
	col(tomo.IconSystemReboot)
	col(tomo.IconSystemShutdown)

	row()
	// actions: tools
	col(tomo.IconToolsCheckSpelling)
	// actions: value
	col(tomo.IconValueIncrement)
	col(tomo.IconValueDecrement)
	col(tomo.IconValueReset)
	// actions: view
	col(tomo.IconViewFullscreen)
	col(tomo.IconViewRefresh)
	col(tomo.IconViewRestore)
	col(tomo.IconViewSortAscending)
	col(tomo.IconViewSortDescending)
	// actions: window
	col(tomo.IconWindowClose)
	col(tomo.IconWindowNew)
	// actions: zoom
	col(tomo.IconZoomFitBest)
	col(tomo.IconZoomIn)
	col(tomo.IconZoomOriginal)
	col(tomo.IconZoomOut)

	row()
	// applications
	// Keep these in sync with nasin.ApplicationRole!
	col(tomo.IconApplication)
	col(tomo.IconApplicationWebBrowser)
	col(tomo.IconApplicationMesssanger)
	col(tomo.IconApplicationPhone)
	col(tomo.IconApplicationMail)
	col(tomo.IconApplicationTerminalEmulator)
	col(tomo.IconApplicationFileBrowser)
	col(tomo.IconApplicationTextEditor)
	col(tomo.IconApplicationDocumentViewer)
	col(tomo.IconApplicationWordProcessor)
	col(tomo.IconApplicationSpreadsheet)
	col(tomo.IconApplicationSlideshow)
	col(tomo.IconApplicationCalculator)
	col(tomo.IconApplicationPreferences)
	col(tomo.IconApplicationProcessManager)
	col(tomo.IconApplicationSystemInformation)
	col(tomo.IconApplicationManual)
	col(tomo.IconApplicationCamera)
	col(tomo.IconApplicationImageViewer)
	col(tomo.IconApplicationMediaPlayer)
	col(tomo.IconApplicationImageEditor)
	col(tomo.IconApplicationAudioEditor)
	col(tomo.IconApplicationVideoEditor)
	col(tomo.IconApplicationClock)
	col(tomo.IconApplicationCalendar)
	col(tomo.IconApplicationChecklist)

	row()
	// categories: applications
	col(tomo.IconApplications)
	col(tomo.IconApplicationsAccessories)
	col(tomo.IconApplicationsDevelopment)
	col(tomo.IconApplicationsEngineering)
	col(tomo.IconApplicationsGames)
	col(tomo.IconApplicationsGraphics)
	col(tomo.IconApplicationsInternet)
	col(tomo.IconApplicationsMultimedia)
	col(tomo.IconApplicationsOffice)
	col(tomo.IconApplicationsScience)
	col(tomo.IconApplicationsSystem)
	col(tomo.IconApplicationsUtilities)
	// categories: preferences
	col(tomo.IconPreferences)
	col(tomo.IconPreferencesDesktop)
	col(tomo.IconPreferencesPeripherals)
	col(tomo.IconPreferencesPersonal)
	col(tomo.IconPreferencesSystem)
	col(tomo.IconPreferencesNetwork)

	row()
	// devices
	col(tomo.IconDevice)
	col(tomo.IconDeviceCamera)
	col(tomo.IconDeviceWebCamera)
	col(tomo.IconDeviceComputer)
	col(tomo.IconDevicePda)
	col(tomo.IconDevicePhone)
	col(tomo.IconDevicePrinter)
	col(tomo.IconDeviceScanner)
	col(tomo.IconDeviceMultimediaPlayer)
	col(tomo.IconDeviceVideoDisplay)
	col(tomo.IconDeviceAudioInput)
	col(tomo.IconDeviceAudioOutput)
	// devices: hardware
	col(tomo.IconHardware)
	col(tomo.IconHardwareCPU)
	col(tomo.IconHardwareGPU)
	col(tomo.IconHardwareRAM)
	col(tomo.IconHardwareSoundCard)
	col(tomo.IconHardwareNetworkAdapter)
	// devices: power
	col(tomo.IconPowerBattery)
	// devices: storage
	col(tomo.IconStorageHardDisk)
	col(tomo.IconStorageFloppyDisk)
	col(tomo.IconStorageSolidState)
	col(tomo.IconStorageOptical)
	col(tomo.IconStorageFlashStick)
	col(tomo.IconStorageFlashCard)
	col(tomo.IconStorageMagneticTape)
	// devices: input
	col(tomo.IconInputGaming)
	col(tomo.IconInputKeyboard)
	col(tomo.IconInputMouse)
	col(tomo.IconInputTablet)

	row()
	// devices: network
	col(tomo.IconNetworkWired)
	col(tomo.IconNetworkWireless)
	col(tomo.IconNetworkCellular)
	col(tomo.IconNetworkLocal)
	col(tomo.IconNetworkInternet)
	col(tomo.IconNetworkVPN)
	col(tomo.IconNetworkServer)
	col(tomo.IconNetworkWorkgroup)

	row()
	// emblems
	col(tomo.IconEmblemDefault)
	col(tomo.IconEmblemEncrypted)
	col(tomo.IconEmblemFavorite)
	col(tomo.IconEmblemImportant)
	col(tomo.IconEmblemReadOnly)
	col(tomo.IconEmblemShared)
	col(tomo.IconEmblemSymbolicLink)
	col(tomo.IconEmblemSynchronized)
	col(tomo.IconEmblemSystem)
	col(tomo.IconEmblemUnreadable)

	row()
	// places
	col(tomo.IconPlaceDirectory)
	col(tomo.IconPlaceRemote)
	col(tomo.IconPlaceHome)
	col(tomo.IconPlaceDownloads)
	col(tomo.IconPlaceDesktop)
	col(tomo.IconPlacePhotos)
	col(tomo.IconPlaceBooks)
	col(tomo.IconPlaceBookmarks)
	col(tomo.IconPlaceTrash)
	col(tomo.IconPlaceDocuments)
	col(tomo.IconPlaceRepositories)
	col(tomo.IconPlaceMusic)
	col(tomo.IconPlaceArchives)
	col(tomo.IconPlaceFonts)
	col(tomo.IconPlaceBinaries)
	col(tomo.IconPlaceVideos)
	col(tomo.IconPlace3DObjects)
	col(tomo.IconPlaceHistory)
	col(tomo.IconPlacePreferences)

	row()
	// status: appointments
	col(tomo.IconAppointmentMissed)
	col(tomo.IconAppointmentSoon)
	// status: dialogs
	col(tomo.IconDialogError)
	col(tomo.IconDialogInformation)
	col(tomo.IconDialogPassword)
	col(tomo.IconDialogQuestion)
	col(tomo.IconDialogWarning)
	// status: directories
	col(tomo.IconDirectoryDragAccept)
	col(tomo.IconDirectoryFull)
	col(tomo.IconDirectoryOpen)
	col(tomo.IconDirectoryVisiting)
	// status: trash
	col(tomo.IconTrashFull)
	// status: resource
	col(tomo.IconResourceLoading)
	col(tomo.IconResourceMissing)
	// status: mail
	col(tomo.IconMailAttachment)
	col(tomo.IconMailUnread)
	col(tomo.IconMailReplied)
	col(tomo.IconMailSigned)
	col(tomo.IconMailSignedVerified)

	row()
	// status: network
	col(tomo.IconCellularSignal0)
	col(tomo.IconCellularSignal1)
	col(tomo.IconCellularSignal2)
	col(tomo.IconCellularSignal3)
	col(tomo.IconWirelessSignal0)
	col(tomo.IconWirelessSignal1)
	col(tomo.IconWirelessSignal2)
	col(tomo.IconWirelessSignal3)
	col(tomo.IconNetworkError)
	col(tomo.IconNetworkIdle)
	col(tomo.IconNetworkOffline)
	col(tomo.IconNetworkReceive)
	col(tomo.IconNetworkTransmit)
	col(tomo.IconNetworkTransmitReceive)
	// status: print
	col(tomo.IconPrintError)
	col(tomo.IconPrintPrinting)
	// status: security
	col(tomo.IconSecurityHigh)
	col(tomo.IconSecurityMedium)
	col(tomo.IconSecurityLow)
	// status: software
	col(tomo.IconSoftwareUpdateAvailable)
	col(tomo.IconSoftwareUpdateUrgent)
	col(tomo.IconSoftwareInstalling)
	// status: sync
	col(tomo.IconSyncError)
	col(tomo.IconSyncSynchronizing)
	// status: tasks
	col(tomo.IconTaskDue)
	col(tomo.IconTaskPastDue)
	// status: users
	col(tomo.IconUserAvailable)
	col(tomo.IconUserAway)
	col(tomo.IconUserIdle)
	col(tomo.IconUserOffline)

	row()
	// status: power
	col(tomo.IconBattery0)
	col(tomo.IconBattery1)
	col(tomo.IconBattery2)
	col(tomo.IconBattery3)
	col(tomo.IconBrightness0)
	col(tomo.IconBrightness1)
	col(tomo.IconBrightness2)
	col(tomo.IconBrightness3)
	// status: media
	col(tomo.IconVolume0)
	col(tomo.IconVolume1)
	col(tomo.IconVolume2)
	col(tomo.IconVolume3)
	col(tomo.IconPlaylistRepeat)
	col(tomo.IconPlaylistShuffle)
	// status: weather
	col(tomo.IconWeatherClear)
	col(tomo.IconWeatherClearNight)
	col(tomo.IconWeatherFewClouds)
	col(tomo.IconWeatherFewCloudsNight)
	col(tomo.IconWeatherFog)
	col(tomo.IconWeatherOvercast)
	col(tomo.IconWeatherSevereAlert)
	col(tomo.IconWeatherShowers)
	col(tomo.IconWeatherShowersScattered)
	col(tomo.IconWeatherSnow)
	col(tomo.IconWeatherStorm)
	
	return atlasTexture, source
}

type iconSet struct {
	atlasSmall canvas.TextureCloser
	atlasLarge canvas.TextureCloser
	texturesSmall map[tomo.Icon] canvas.Texture
	texturesLarge map[tomo.Icon] canvas.Texture
}

// New creates a new fallback icon set.
func New () (style.IconSet, event.Cookie) {
	iconSet := new(iconSet)
	return iconSet, iconSet
}

func (this *iconSet) ensure () {
	if this.texturesSmall != nil { return }
	this.atlasSmall, this.texturesSmall = generateSource(atlasSmallBytes, 16)
	this.atlasLarge, this.texturesLarge = generateSource(atlasLargeBytes, 32)
}

func (this *iconSet) selectSource (size tomo.IconSize) map[tomo.Icon] canvas.Texture {
	if size == tomo.IconSizeSmall {
		return this.texturesSmall
	} else {
		return this.texturesLarge
	}
}

func (this *iconSet) Icon (icon tomo.Icon, size tomo.IconSize) canvas.Texture {
	this.ensure()
	source := this.selectSource(size)
	if texture, ok := source[icon]; ok {
		return texture
	}
	return nil
}

func (this *iconSet) MimeIcon (mime data.Mime, size tomo.IconSize) canvas.Texture {
	this.ensure()
	source := this.selectSource(size)

	if icon, ok := source[tomo.Icon(mime.String())]; ok {
		return icon
	}

	if mime == data.M("inode", "directory") {
		return source[tomo.IconPlaceDirectory]
	} else if icon, ok := source[tomo.Icon(util.GeneralizeXDGIconMimeType(mime).String())]; ok {
		return icon
	} else {
		return source[tomo.Icon(iconApplicationXGeneric)]
	}
}

func (this *iconSet) Close () {
	if this.atlasSmall != nil {
		this.atlasSmall.Close()
	}
	if this.atlasLarge != nil {
		this.atlasLarge.Close()
	}
}