import numpy
import typing

from qtpy import QtCore as QC
from qtpy import QtWidgets as QW
from qtpy import QtGui as QG

from hydrus.core import HydrusConstants as HC
from hydrus.core import HydrusData
from hydrus.core import HydrusGlobals as HG
from hydrus.core import HydrusText

from hydrus.client.gui import ClientGUIDialogsMessage
from hydrus.client.gui import QtInit
from hydrus.client.gui import QtPorting as QP
from hydrus.core.files.images import HydrusImageNormalisation

def ClientToScreen( win: QW.QWidget, pos: QC.QPoint ) -> QC.QPoint:
    
    tlw = win.window()
    
    if ( win.isVisible() and tlw.isVisible() ):
        
        return win.mapToGlobal( pos )
        
    else:
        
        return QC.QPoint( 50, 50 )
        
    
def ColourIsBright( colour: QG.QColor ):
    
    it_is_bright = colour.valueF() > 0.75
    
    return it_is_bright
    
def ColourIsGreyish( colour: QG.QColor ):
    
    it_is_greyish = colour.hsvSaturationF() < 0.12
    
    return it_is_greyish
    
# OK, so we now have a fixed block for width, which we sometimes want to calculate in both directions.
# by normalising our 'one character' width, the inverse calculation uses the same coefficient and we aren't losing so much in rounding
NUM_CHARS_FOR_WIDTH_CALCULATIONS = 32
MAGIC_TEXT_PADDING = 1.1

def GetOneCharacterPixelHeight( window ) -> float:
    
    return window.fontMetrics().height() * MAGIC_TEXT_PADDING
    
def GetOneCharacterPixelWidth( window ) -> float:
    
    char_block_width = window.fontMetrics().boundingRect( NUM_CHARS_FOR_WIDTH_CALCULATIONS * 'x' ).width() * MAGIC_TEXT_PADDING
    
    one_char_width = char_block_width / NUM_CHARS_FOR_WIDTH_CALCULATIONS
    
    return one_char_width
    
def ConvertPixelsToTextWidth( window, pixels, round_down = False ) -> int:
    
    one_char_width = GetOneCharacterPixelWidth( window )
    
    if round_down:
        
        return int( pixels // one_char_width )
        
    else:
        
        return round( pixels / one_char_width )
        
    
def ConvertQtImageToNumPy( qt_image: QG.QImage, strip_useless_alpha = True ):
    
    #        _     _                          _        _                           
    #    _  | |   (_)          _             | |      | |                          
    #  _| |_| |__  _  ___    _| |_ ___   ___ | |  _   | |__   ___  _   _  ____ ___ 
    # (_   _)  _ \| |/___)  (_   _) _ \ / _ \| |_/ )  |  _ \ / _ \| | | |/ ___)___)
    #   | |_| | | | |___ |    | || |_| | |_| |  _ (   | | | | |_| | |_| | |  |___ |
    #    \__)_| |_|_(___/      \__)___/ \___/|_| \_)  |_| |_|\___/|____/|_|  (___/ 
    #
    # Ok so I don't know what is going on, but QImage 'ARGB32' bitmaps seem to actually be stored BGRA!!!
    # if you tell them to convert to RGB888, they switch their bytes around to RGB, so this is probably some internal Qt gubbins
    # The spec says they are 0xAARRGGBB, so I'm guessing it is swapped for some X-endian reason???
    # unfortunately this messes with us a little, since we rip these bits and assume we are getting RGBA
    # Ok, I figured it out, just convert to RGBA8888 (which supposedly _is_ endian ordered) and it sorts itself out
    # I guess someone on different endian-ness won't get the right answer? I'd believe it if ARGB32 wasn't reversed
    # if that is the case, we can inspect the 'PixelFormat' of the bmp and it'll say our endianness, and then I guess I reverse or something
    # probably easier, whatever the case, to do that sort of clever channel swapping once we are in numpy
    # another ultimate answer is probably to convert to rgb888 and rip the alpha too and recombine, or just ditch the alpha who cares
    
    qt_image = qt_image.copy()
    
    if qt_image.hasAlphaChannel():
        
        if qt_image.format() != QG.QImage.Format_RGBA8888:
            
            qt_image.convertTo( QG.QImage.Format_RGBA8888 )
            
        
    else:
        
        if qt_image.format() != QG.QImage.Format_RGB888:
            
            qt_image.convertTo( QG.QImage.Format_RGB888 )
            
        
    
    width = qt_image.width()
    height = qt_image.height()
    
    if qt_image.depth() == 1:
        
        # this is probably super wrong, but whatever for now
        depth = 1
        
    else:
        
        # 8, 24, 32 etc...
        depth = qt_image.depth() // 8
        
    
    data_bytearray = qt_image.bits()
    
    if QtInit.WE_ARE_PYSIDE:
        
        data_bytes = bytes( data_bytearray )
        
    elif QtInit.WE_ARE_PYQT:
        
        data_bytes = data_bytearray.asstring( height * width * depth )
        
    
    if qt_image.bytesPerLine() == width * depth:
        
        numpy_image = numpy.fromstring( data_bytes, dtype = 'uint8' ).reshape( ( height, width, depth ) )
        
    else:
        
        # ok bro, so in some cases a qt_image stores its lines with a bit of \x00 padding. you have a 990-pixel line that is 2970+2 bytes long
        # apparently this is system memory storage limitations blah blah blah. it can also happen when you qt_image.copy(), so I guess it makes for pleasant memory layout little-endian something
        # so far I have only encountered simple instances of this, with data up front and zero bytes at the end
        # so let's just strip it lad
        
        bytes_per_line = qt_image.bytesPerLine()
        desired_bytes_per_line = width * depth
        excess_bytes_to_trim = bytes_per_line - desired_bytes_per_line
        
        numpy_padded = numpy.fromstring( data_bytes, dtype = 'uint8' ).reshape( ( height, bytes_per_line ) )
        
        numpy_image = numpy_padded[ :, : -excess_bytes_to_trim ].reshape( ( height, width, depth ) )
        
    
    if strip_useless_alpha:
        
        numpy_image = HydrusImageNormalisation.StripOutAnyUselessAlphaChannel( numpy_image )
        
    
    return numpy_image
    
def ConvertTextToPixels( window, char_dimensions ) -> typing.Tuple[ int, int ]:
    
    ( char_cols, char_rows ) = char_dimensions
    
    one_char_width = GetOneCharacterPixelWidth( window )
    one_char_height = GetOneCharacterPixelHeight( window )
    
    return ( round( char_cols * one_char_width ), round( char_rows * one_char_height ) )
    
def ConvertTextToPixelWidth( window, char_cols ) -> int:
    
    one_char_width = GetOneCharacterPixelWidth( window )
    
    return round( char_cols * one_char_width )
    

def DialogIsOpen():
    
    tlws = QW.QApplication.topLevelWidgets()
    
    for tlw in tlws:
        
        if isinstance( tlw, QP.Dialog ) and tlw.isModal():
            
            return True
            
        
    
    return False
    

def DrawText( painter, x, y, text ):
    
    ( size, text ) = GetTextSizeFromPainter( painter, text )
    
    painter.drawText( QC.QRectF( x, y, size.width(), size.height() ), text )
    

def EscapeMnemonics( s: str ):
    
    return s.replace( "&", "&&" )
    

def GetDifferentLighterDarkerColour( colour, intensity = 3 ):
    
    new_hue = colour.hsvHueF()
    
    if new_hue == -1: # completely achromatic
        
        new_hue = 0.5
        
    else:
        
        new_hue = ( new_hue + 0.33 ) % 1.0
        
    
    new_saturation = colour.hsvSaturationF()
    
    if ColourIsGreyish( colour ):
        
        new_saturation = 0.2
        
    
    new_colour = QG.QColor.fromHsvF( new_hue, new_saturation, colour.valueF(), colour.alphaF() )
    
    return GetLighterDarkerColour( new_colour, intensity )
    
def GetDisplayPosition( window ):
    
    return window.screen().availableGeometry().topLeft()
    
def GetDisplaySize( window ):
    
    return window.screen().availableGeometry().size()
    
def GetLighterDarkerColour( colour, intensity = 3 ):
    
    if intensity is None or intensity == 0:
        
        return colour
        
    
    # darker/lighter works by multiplying value, so when it is closer to 0, lmao
    breddy_darg_made = 0.25
    
    if colour.value() < breddy_darg_made:
        
        colour = QG.QColor.fromHslF( colour.hsvHueF(), colour.hsvSaturationF(), breddy_darg_made, colour.alphaF() )
        
    
    qt_intensity = 100 + ( 20 * intensity )
    
    if ColourIsBright( colour ):
        
        return colour.darker( qt_intensity )
        
    else:
        
        return colour.lighter( qt_intensity )
        
    
def GetMouseScreen():
    
    return QW.QApplication.screenAt( QG.QCursor.pos() )
    
def GetTextSizeFromPainter( painter: QG.QPainter, text: str ):
    
    try:
        
        text_size = painter.fontMetrics().size( QC.Qt.TextSingleLine, text )
        
    except ValueError:
        
        from hydrus.client.metadata import ClientTags
        
        if not ClientTags.have_shown_invalid_tag_warning:
            
            from hydrus.core import HydrusData
            
            HydrusData.ShowText( 'Hey, I think hydrus stumbled across an invalid tag! Please run _database->check and repair->fix invalid tags_ immediately, or you may get errors!' )
            
            bad_text = repr( text )
            bad_text = HydrusText.ElideText( bad_text, 24 )
            
            HydrusData.ShowText( 'The bad text was: {}'.format( bad_text ) )
            
            ClientTags.have_shown_invalid_tag_warning = True
            
        
        text = '*****INVALID, UNDISPLAYABLE TAG, RUN DATABASE REPAIR NOW*****'
        
        text_size = painter.fontMetrics().size( QC.Qt.TextSingleLine, text )
        
    
    return ( text_size, text )
    
def GetTLWParents( widget ):
    
    widget_tlw = widget.window()        
    
    parent_tlws = []
    
    parent = widget_tlw.parentWidget()
    
    while parent is not None:
        
        parent_tlw = parent.window()
        
        parent_tlws.append( parent_tlw )
        
        parent = parent_tlw.parentWidget()
        
    
    return parent_tlws
    
def IsQtAncestor( child: QW.QWidget, ancestor: QW.QWidget, through_tlws = False ):
    
    if child is None:
        
        return False
        
    
    if child == ancestor:
        
        return True
        
    
    parent = child
    
    if through_tlws:
        
        while parent is not None:
            
            if parent == ancestor:
                
                return True
                
            
            parent = parent.parentWidget()
            
        
    else:
        
        # only works within window
        return ancestor.isAncestorOf( child )
        
    
    return False
    
def MouseIsOnMyDisplay( window ):
    
    window_handle = window.window().windowHandle()
    
    if window_handle is None:
        
        return False
        
    
    window_screen = window_handle.screen()
    
    mouse_screen = GetMouseScreen()
    
    return mouse_screen is window_screen
    
def MouseIsOverWidget( win: QW.QWidget ):
    
    # note this is different from win.underMouse(), which in different situations seems to be more complicated than just a rect test
    
    # I also had QWidget.underMouse() do flicker on the border edge between two lads next to each other. I guess there might be a frameGeometry vs geometry issue, but dunno. not like I test that here
    
    global_mouse_pos = QG.QCursor.pos()
    
    local_mouse_pos = win.mapFromGlobal( global_mouse_pos )
    
    return win.rect().contains( local_mouse_pos )
    
def NotebookScreenToHitTest( notebook, screen_position ):
    
    tab_pos = notebook.tabBar().mapFromGlobal( screen_position )    
    
    return notebook.tabBar().tabAt( tab_pos )
    

def PresentClipboardParseError( win: QW.QWidget, content: str, expected_content_description: str, e: Exception ):
    
    MAX_CONTENT_SIZE = 1024
    
    log_message = 'Clipboard Error!\nI was expecting: {}'.format( expected_content_description )
    
    if len( content ) > MAX_CONTENT_SIZE:
        
        log_message += '\nFirst {} of content received (total was {}):\n'.format( HydrusData.ToHumanBytes( MAX_CONTENT_SIZE ), HydrusData.ToHumanBytes( len( content ) ) ) + content[:MAX_CONTENT_SIZE]
        
    else:
        
        log_message += '\nContent received ({}):\n'.format( HydrusData.ToHumanBytes( len( content ) ) ) + content[:MAX_CONTENT_SIZE]
        
    
    HydrusData.DebugPrint( log_message )
    
    HydrusData.PrintException( e, do_wait = False )
    
    message = 'Sorry, I could not understand what was in the clipboard. I was expecting "{}" but received this text:\n\n{}\n\nMore details have been written to the log, but the general error was:\n\n{}'.format( expected_content_description, HydrusText.ElideText( content, 64 ), repr( e ) )
    
    ClientGUIDialogsMessage.ShowCritical( win, 'Clipboard Error!', message )
    

def SetBitmapButtonBitmap( button, bitmap ):
    
    # old wx stuff, but still basically relevant
    # the button's bitmap, retrieved via GetBitmap, is not the same as the one we gave it!
    # hence testing bitmap vs that won't work to save time on an update loop, so we'll just save it here custom
    # this isn't a big memory deal for our purposes since they are small and mostly if not all from the GlobalPixmaps library so shared anyway
    
    if hasattr( button, 'last_bitmap' ):
        
        if button.last_bitmap == bitmap:
            
            return
            
        
    
    button.setIcon( QG.QIcon( bitmap ) )
    button.setIconSize( bitmap.size() )
    
    button.last_bitmap = bitmap
    
def SetFocusLater( win: QW.QWidget ):
    
    HG.client_controller.CallAfterQtSafe( win, 'set focus to a window', win.setFocus, QC.Qt.OtherFocusReason )
    
def TLWIsActive( window ):
    
    return window.window() == QW.QApplication.activeWindow()
    
def TLWOrChildIsActive( win ):
    
    current_focus_tlw = QW.QApplication.activeWindow()
    
    if current_focus_tlw is None:
        
        return False
        
    
    if current_focus_tlw == win:
        
        return True
        
    
    if win in GetTLWParents( current_focus_tlw ):
        
        return True
        
    
    return False
    

def UpdateAppDisplayName():
    
    app_display_name = HG.client_controller.new_options.GetString( 'app_display_name' )
    
    QW.QApplication.instance().setApplicationDisplayName( '{} {}'.format( app_display_name, HC.SOFTWARE_VERSION ) )
    
    for tlw in QW.QApplication.topLevelWidgets():
        
        window_title = tlw.windowTitle()
        
        if window_title != '':
            
            tlw.setWindowTitle( '' )
            
            tlw.setWindowTitle( window_title )
            
        
    

def WidgetOrAnyTLWChildHasFocus( window ):
    
    active_window = QW.QApplication.activeWindow()
    
    if window == active_window:
        
        return True
        
    
    widget = QW.QApplication.focusWidget()
    
    if widget is None:
        
        # take active window in lieu of focus, if it is unavailable
        widget = active_window
        
    
    while widget is not None:
        
        if widget == window:
            
            return True
            
        
        widget = widget.parentWidget()
        
    
    return False
    
