{-
  Movie Monad
  (C) 2017 David lettier
  lettier.com
-}

{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}

module Main where

import Prelude
import System.Info
import Data.IORef
import Data.Maybe
import Data.Text
import Data.GI.Base
import Data.GI.Base.Properties
import GI.GObject
import qualified GI.Gtk
import GI.Gst
import GI.GstVideo
import GI.GdkPixbuf

import qualified Records as R
import Constants
import Window
import CommandLine
import Mouse
import Keyboard
import FileChooser
import Seek
import PlayPause
import Fullscreen
import ErrorMessage
import About
import VideoSizeSelector
import Playbin
import ScreensaverAndPowerManagement (disable, enable)
import Utils

import Paths_movie_monad

-- Declare Element a type instance of IsVideoOverlay via a newtype wrapper
-- Our GStreamer element is playbin
-- Playbin implements the GStreamer VideoOverlay interface
newtype GstElement = GstElement GI.Gst.Element
instance GI.GstVideo.IsVideoOverlay GstElement

main :: IO ()
main = do
  _ <- GI.Gst.init Nothing
  _ <- GI.Gtk.init Nothing

  gladeFile <- getDataFileName "data/gui.glade"
  builder <- GI.Gtk.builderNewFromFile (pack gladeFile)

  window <- builderGetObject GI.Gtk.Window builder "window"
  fileChooserButton <- builderGetObject GI.Gtk.Button builder "file-chooser-button"
  fileChooserButtonLabel <- builderGetObject GI.Gtk.Label builder "file-chooser-button-label"
  fileChooserDialog <- builderGetObject GI.Gtk.Dialog builder "file-chooser-dialog"
  fileChooserEntry <- builderGetObject GI.Gtk.Entry builder "file-chooser-entry"
  fileChooserWidget <- builderGetObject GI.Gtk.FileChooserWidget builder "file-chooser-widget"
  fileChooserCancelButton <- builderGetObject GI.Gtk.Button builder "file-chooser-cancel-button"
  fileChooserOpenButton <- builderGetObject GI.Gtk.Button builder "file-chooser-open-button"
  videoWidgetBox <- builderGetObject GI.Gtk.Box builder "video-widget-box"
  bottomControlsGtkBox <- builderGetObject GI.Gtk.Box builder "bottom-controls-gtk-box"
  seekScale <- builderGetObject GI.Gtk.Scale builder "seek-scale"
  playPauseButton <- builderGetObject GI.Gtk.Button builder "play-pause-button"
  playImage <- builderGetObject GI.Gtk.Image builder "play-image"
  pauseImage <- builderGetObject GI.Gtk.Image builder "pause-image"
  volumeButton <- builderGetObject GI.Gtk.VolumeButton builder "volume-button"
  videoWidthSelectionComboBox <- builderGetObject GI.Gtk.ComboBoxText builder "video-width-selection-combo-box"
  fullscreenButton <- builderGetObject GI.Gtk.Button builder "fullscreen-button"
  bufferingSpinner <- builderGetObject GI.Gtk.Spinner builder "buffering-spinner"
  errorMessageDialog <- builderGetObject GI.Gtk.MessageDialog builder "error-message-dialog"
  aboutButton <- builderGetObject GI.Gtk.Button builder "about-button"
  aboutDialog <- builderGetObject GI.Gtk.AboutDialog builder "about-dialog"

  logoFile <- getDataFileName "data/movie-monad-logo.svg"
  logo <- GI.GdkPixbuf.pixbufNewFromFile (pack logoFile)
  GI.Gtk.aboutDialogSetLogo aboutDialog (Just logo)

  -- Glade does not allow us to use the response ID nicknames so we programmatically set them here.
  GI.Gtk.dialogAddActionWidget fileChooserDialog fileChooserCancelButton (enumToInt32 GI.Gtk.ResponseTypeCancel)
  GI.Gtk.dialogAddActionWidget fileChooserDialog fileChooserOpenButton   (enumToInt32 GI.Gtk.ResponseTypeOk)

  isWindowFullScreenRef <- newIORef False
  mouseMovedLastRef <- newIORef 0
  previousFileNamePathRef <- newIORef ""
  videoInfoRef <- newIORef R.defaultVideoInfo

  let ioRefs = R.IORefs {
        R.isWindowFullScreenRef = isWindowFullScreenRef
      , R.mouseMovedLastRef = mouseMovedLastRef
      , R.previousFileNamePathRef = previousFileNamePathRef
      , R.videoInfoRef = videoInfoRef
    }

  playbin <- fromJust <$> GI.Gst.elementFactoryMake "playbin" (Just "MultimediaPlayerPlaybin")
  maybeGtkSink <- GI.Gst.elementFactoryMake "gtksink" (Just "MultimediaPlayerGtkSink")
  videoWidget <-
    case maybeGtkSink of
      Nothing -> do
        putStrLn "Could not create a GtkSink. Please install the bad plugins, version 1.8 or higher, for GStreamer 1."
        drawingArea <- GI.Gtk.drawingAreaNew
        GI.Gtk.widgetSetName drawingArea invalidVideoWidgetName
        GI.Gtk.unsafeCastTo GI.Gtk.Widget drawingArea
      Just gtkSink ->
        fromJust <$> Data.GI.Base.Properties.getObjectPropertyObject gtkSink "widget" GI.Gtk.Widget

  Data.GI.Base.Properties.setObjectPropertyObject playbin "video-sink" maybeGtkSink
  Data.GI.Base.Properties.setObjectPropertyBool   playbin "force-aspect-ratio" True
  GI.Gtk.boxPackStart videoWidgetBox videoWidget True True 0
  GI.Gtk.widgetSetHexpand videoWidget True
  GI.Gtk.widgetSetVexpand videoWidget True
  GI.Gtk.widgetSetSensitive videoWidget True

  playbinBus <- GI.Gst.elementGetBus playbin

  let guiObjects = R.GuiObjects {
        R.window = window
      , R.fileChooserButton = fileChooserButton
      , R.fileChooserButtonLabel = fileChooserButtonLabel
      , R.fileChooserDialog = fileChooserDialog
      , R.fileChooserEntry = fileChooserEntry
      , R.fileChooserWidget = fileChooserWidget
      , R.fileChooserCancelButton = fileChooserCancelButton
      , R.fileChooserOpenButton = fileChooserOpenButton
      , R.videoWidget = videoWidget
      , R.bottomControlsGtkBox = bottomControlsGtkBox
      , R.seekScale = seekScale
      , R.playPauseButton = playPauseButton
      , R.playImage = playImage
      , R.pauseImage = pauseImage
      , R.volumeButton = volumeButton
      , R.videoWidthSelectionComboBox = videoWidthSelectionComboBox
      , R.fullscreenButton = fullscreenButton
      , R.bufferingSpinner = bufferingSpinner
      , R.errorMessageDialog = errorMessageDialog
      , R.aboutButton = aboutButton
      , R.aboutDialog = aboutDialog
    }

  let application = R.Application {
        R.guiObjects = guiObjects
      , R.ioRefs = ioRefs
      , R.playbin = playbin
      , R.playbinBus = playbinBus
    }

  addWindowHandlers application [playVideoFromCommandLineIfNeeded]
  addPlaybinHandler application
  addFileChooserHandlers application
  addPlayPauseButtonClickHandler application
  addSeekHandlers application
  addVideoSizeSelectorHandler application
  addFullscreenButtonReleaseHandler application
  addWindowMouseMoveHandlers application
  addAboutHandler application
  addKeyboardEventHandler application
  addErrorMessageDialogHandler application

  let operatingSystem = System.Info.os
  screenAndPowerManagementActions <- ScreensaverAndPowerManagement.disable operatingSystem

  GI.Gtk.widgetShowAll window
  GI.Gtk.main

  ScreensaverAndPowerManagement.enable operatingSystem screenAndPowerManagementActions

builderGetObject ::
  (GI.GObject.GObject b, GI.Gtk.IsBuilder a) =>
  (Data.GI.Base.ManagedPtr b -> b) ->
  a ->
  Prelude.String ->
  IO b
builderGetObject objectTypeClass builder objectId =
  fromJust <$> GI.Gtk.builderGetObject builder (pack objectId) >>=
    GI.Gtk.unsafeCastTo objectTypeClass