package Xconfig::xfree; # $Id$

use diagnostics;
use strict;

use common;
use Xconfig::parse;

#- mostly internal only
sub new {
    my ($class, $val) = @_;
    bless $val, $class;
}

################################################################################
# I/O ##########################################################################
################################################################################
sub read {
    my ($class) = @_;
    my @files = map { "$::prefix/etc/X11/$_" } 'xorg.conf', 'XF86Config-4', 'XF86Config';
    my $file = (find { -f $_ && ! -l $_ } @files) || (find { -f $_ } @files);
    $class->new(Xconfig::parse::read_XF86Config($file));
}
sub write {
    my ($raw_X, $o_file) = @_;
    my $file = $o_file || "$::prefix/etc/X11/XF86Config";
    if (!$o_file) {
	my $xorg = "$::prefix/etc/X11/xorg.conf";
	foreach ($file, "$file-4", $xorg) {
	    if (-l $_) {
		unlink $_;
	    } else {
		rename $_, "$_.old"; #- there won't be any XF86Config-4 anymore, we want this!
	    }
	}
	symlinkf 'XF86Config', $xorg;
    }
    Xconfig::parse::write_XF86Config($raw_X, $file);
}
sub prepare_write {
    my ($raw_X) = @_;
    join('', Xconfig::parse::prepare_write_XF86Config($raw_X));
}
sub empty_config {
    my ($class) = @_;
    $class->new(Xconfig::parse::read_XF86Config_from_string(our $default_header));
}

################################################################################
# keyboard #####################################################################
################################################################################
my @keyboard_fields = qw(XkbLayout XkbModel XkbDisable XkbOptions XkbCompat);
sub get_keyboard {
    my ($raw_X) = @_;
    my $raw_kbd = first($raw_X->get_InputDevices('Keyboard')) or die "no keyboard section";
    raw_export_section($raw_kbd, \@keyboard_fields);
}
sub set_keyboard {
    my ($raw_X, $kbd) = @_;
    my $raw_kbd = first($raw_X->get_InputDevices('Keyboard')) || _new_keyboard_section($raw_X);
    raw_import_section($raw_kbd, $kbd);
    _set_Option('keyboard', $raw_kbd, keys %$kbd);
}
sub _new_keyboard_section {
    my ($raw_X) = @_;
    my $raw_kbd = { Identifier => { val => 'Keyboard1' }, Driver => { val => 'Keyboard' } };
    $raw_X->add_Section('InputDevice', $raw_kbd);

    my $layout = get_ServerLayout($raw_X)->{InputDevice} ||= [];
    push @$layout, { val => '"Keyboard1" "CoreKeyboard"' };

    $raw_kbd;
}


################################################################################
# mouse ########################################################################
################################################################################
#- example: { Protocol => 'IMPS/2', Device => '/dev/psaux', Emulate3Buttons => undef, Emulate3Timeout => 50, ZAxisMapping => [ '4 5', '6 7' ] }
my @mouse_fields = qw(Protocol Device ZAxisMapping Emulate3Buttons Emulate3Timeout); #-);
sub get_mice {
    my ($raw_X) = @_;
    my @raw_mice = $raw_X->get_InputDevices('mouse');
    map { raw_export_section($_, \@mouse_fields) } @raw_mice;
}
sub set_mice {
    my ($raw_X, @mice) = @_;
    my @raw_mice = _new_mouse_sections($raw_X, int @mice);
    mapn { 
	my ($raw_mouse, $mouse) = @_;
	raw_import_section($raw_mouse, $mouse);
	_set_Option('mouse', $raw_mouse, keys %$mouse);
    } \@raw_mice, \@mice;
}
sub _new_mouse_sections {
    my ($raw_X, $nb_new) = @_;
    $raw_X->remove_InputDevices('mouse');
    
    my $layout = get_ServerLayout($raw_X)->{InputDevice} ||= [];
    @$layout = grep { $_->{val} !~ /^"Mouse/ } @$layout;
    
    $nb_new or return;
    
    my @l = map {
	my $h = { Identifier => { val => "Mouse$_" }, Driver => { val => 'mouse' } };
	$raw_X->add_Section('InputDevice', $h);
    } (1 .. $nb_new);
    
    push @$layout, { val => qq("Mouse1" "CorePointer") };
    push @$layout, { val => qq("Mouse$_" "SendCoreEvents") } foreach 2 .. $nb_new;
    
    @l;
}


################################################################################
# resolution ###################################################################
################################################################################
sub get_resolution {
    my ($raw_X, $o_Screen) = @_;
    my $Screen = $o_Screen || $raw_X->get_default_screen or return {};
    
    my $depth = val($Screen->{DefaultColorDepth});
    my $Display = find { !$depth || val($_->{l}{Depth}) eq $depth } @{$Screen->{Display} || []} or return {};
    $Display->{l}{Virtual} && val($Display->{l}{Virtual}) =~ /(\d+)\s+(\d+)/ or
      val($Display->{l}{Modes}) =~ /(\d+)x(\d+)/ or return {};
    { X => $1, Y => $2, Depth => val($Display->{l}{Depth}) };
}
sub set_resolution {
    my ($raw_X, $resolution, $o_Screen_) = @_;
    
    foreach my $Screen ($o_Screen_ ? $o_Screen_ : $raw_X->get_Sections('Screen')) {
	$Screen ||= $raw_X->get_default_screen or internal_error('no screen');
	
	$Screen->{DefaultColorDepth} = { val => $resolution->{Depth} eq '32' ? 24 : $resolution->{Depth} };
	$Screen->{Display} = [ map {
	    { l => { Depth => { val => $_ }, Virtual => { val => join(' ', @$resolution{'X', 'Y'}) } } };
	} 8, 15, 16, 24 ];
    }
}


################################################################################
# device #######################################################################
################################################################################
my @device_fields = qw(VendorName BoardName Driver VideoRam Screen BusID); #-);
sub get_device {
    my ($raw_X) = @_;
    first(get_devices($raw_X));
}
sub get_devices {
    my ($raw_X) = @_;
    my @raw_devices = $raw_X->get_Sections('Device');
    map {
	my $raw_device = $_;
	my $device = raw_export_section($raw_device, [ 'Identifier', @device_fields ]);
	$device->{Options} = raw_export_section($raw_device, [ grep { (deref_array($raw_device->{$_}))[0]->{Option} } keys %$raw_device ]);
	$device;
    } @raw_devices;
}
sub set_devices {
    my ($raw_X, @devices) = @_;
    my @raw_devices = _new_device_sections($raw_X, int @devices);
    mapn { 
	my ($raw_device, $device) = @_;
	my %Options  = %{$device->{Options} || {}};
	raw_import_section($raw_device, $device, \@device_fields);
	raw_import_section($raw_device, \%Options);
	$_->{Option} = 1 foreach map { deref_array($raw_device->{$_}) } keys %Options;
	$raw_device->{''} = [ { post_comment => $device->{raw_LINES} } ] if $device->{raw_LINES};
    } \@raw_devices, \@devices;
}
sub _new_device_sections {
    my ($raw_X, $nb_new) = @_;
    $raw_X->remove_Section('Device');
    map { $raw_X->add_Section('Device', { Identifier => { val => "device$_" }, DPMS => { Option => 1 } }) } (1 .. $nb_new);
}


################################################################################
# wacoms #######################################################################
################################################################################
sub set_wacoms {
    my ($raw_X, @wacoms) = @_;
    $raw_X->remove_InputDevices('wacom');
    
    my $layout = get_ServerLayout($raw_X)->{InputDevice} ||= [];
    @$layout = grep { $_->{val} !~ /^"(Stylus|Eraser|Cursor)/ } @$layout;
    
    @wacoms or return;
    
    my %Modes = (Stylus => 'Absolute', Eraser => 'Absolute', Cursor => 'Relative');
    
    each_index {
	my $wacom = $_;
	foreach (keys %Modes) {
	    my $identifier = $_ . ($::i + 1);
	    my $h = { Identifier => { val => $identifier }, 
		      Driver => { val => 'wacom' },
		      Type => { val => lc $_, Option => 1 },
		      Device => { val => $wacom->{Device}, Option => 1 },
		      Mode => { val => $Modes{$_}, Option => 1 },
		      if_($wacom->{USB}, USB => { Option => 1 })
		    };
	    $raw_X->add_Section('InputDevice', $h);
	    push @$layout, { val => qq("$identifier" "AlwaysCore") };
	}
    } @wacoms;
}


################################################################################
# monitor ######################################################################
################################################################################
my @monitor_fields = qw(VendorName ModelName HorizSync VertRefresh);
sub get_monitors {
    my ($raw_X) = @_;
    my @raw_monitors = $raw_X->get_Sections('Monitor');
    map { raw_export_section($_, [ 'Identifier', @monitor_fields ]) } @raw_monitors;
}
sub set_monitors {
    my ($raw_X, @monitors) = @_;
    my @raw_monitors = _new_monitor_sections($raw_X, int @monitors);
    mapn { 
	my ($raw_monitor, $monitor) = @_;
	raw_import_section($raw_monitor, $monitor, \@monitor_fields);
    } \@raw_monitors, \@monitors;
}
sub get_or_new_monitors {
    my ($raw_X, $nb_new) = @_;
    my @monitors = $raw_X->get_monitors;

    #- ensure we have exactly $nb_new monitors;
    if ($nb_new > @monitors) {
	@monitors, ({}) x ($nb_new - @monitors);
    } else {
	splice(@monitors, 0, $nb_new);
    }
}
sub _new_monitor_sections {
    my ($raw_X, $nb_new) = @_;
    my $ModeLine = ModeLine_from_string(qq(Section "Monitor"\n) . (our $default_ModeLine) . qq(EndSection\n));
    $raw_X->remove_Section('Monitor');
    map { $raw_X->add_Section('Monitor', { Identifier => { val => "monitor$_" }, ModeLine => $ModeLine }) } (1 .. $nb_new);
}


################################################################################
# screens ######################################################################
################################################################################
sub get_default_screen {
    my ($raw_X) = @_;
    my @l = $raw_X->get_Sections('Screen');
    (find { $_->{Identifier} && val($_->{Identifier}) eq 'screen1' || 
	      $_->{Driver} && val($_->{Driver}) =~ /svga|accel/ } @l) || $l[0];
}
sub set_screens {
    my ($raw_X, @screens) = @_;
    my @raw_screens = _new_screen_sections($raw_X, int @screens);
    mapn { 
	my ($raw_screen, $screen) = @_;
	raw_import_section($raw_screen, $screen);
    } \@raw_screens, \@screens;
}
sub _new_screen_sections {
    my ($raw_X, $nb_new) = @_;
    $raw_X->remove_Section('Screen');
    my @l = map { $raw_X->add_Section('Screen', { Identifier => { val => "screen$_" } }) } (1 .. $nb_new);

    get_ServerLayout($raw_X)->{Screen} = [ 
	{ val => qq("screen1") },
	map { { val => sprintf('"screen%d" RightOf "screen%d"', $_, $_ - 1) } } (2 .. $nb_new)
    ];
    @l;
}
sub is_fbdev {
    my ($raw_X, $o_Screen) = @_;

    my $Screen = $o_Screen || $raw_X->get_default_screen or return;

    my $Device = $raw_X->get_Section_by_Identifier('Device', val($Screen->{Device})) or internal_error("no device named $Screen->{Device}");
    val($Device->{Driver}) eq 'fbdev';
}




################################################################################
# modules ######################################################################
################################################################################
sub get_modules {
    my ($raw_X) = @_;
    my $raw_Module = $raw_X->get_Section('Module') or return;
    my $Module = raw_export_section($raw_Module, ['Load']);
    @{$Module->{Load} || []};
}
sub add_load_module {
    my ($raw_X, $module) = @_;
    my $raw_Module = $raw_X->get_Section('Module') || $raw_X->add_Section('Module', {});

    my %load_modules_comment = (
	dbe => 'Double-Buffering Extension',
	v4l => 'Video for Linux',
	dri => 'direct rendering',
	glx => '3D layer',
	'glx-3.so' => '3D layer',
    );
    my $comment = $load_modules_comment{$module};
    push @{$raw_Module->{Load}}, { val => $module,
				   comment_on_line => $comment && " # $comment",
				 } if !member($module, $raw_X->get_modules);
}
sub remove_load_module {
    my ($raw_X, $module) = @_;
    my $raw_Module = $raw_X->get_Section('Module') or return;
    if (my @l = grep { $_->{val} ne $module } @{$raw_Module->{Load}}) {
	$raw_Module->{Load} = \@l;
    } else {
	$raw_X->remove_Section('Module');
    }
}
sub set_load_module {
    my ($raw_X, $module, $bool) = @_;
    $bool ? add_load_module($raw_X, $module) : remove_load_module($raw_X, $module);
}


#-##############################################################################
#- helpers
#-##############################################################################
sub _set_Option {
    my ($category, $node, @names) = @_;
    
    if (member($category, 'keyboard', 'mouse')) {
	#- everything we export is an Option
	$_->{Option} = 1 foreach map { deref_array($node->{$_}) } @names;
    }
}

sub get_InputDevices {
    my ($raw_X, $Driver) = @_;
    $raw_X->get_Sections('InputDevice', sub { val($_[0]{Driver}) eq $Driver });
}
sub remove_InputDevices {    
    my ($raw_X, $Driver) = @_;
    $raw_X->remove_Section('InputDevice', sub { val($_[0]{Driver}) ne $Driver });
}

sub get_ServerLayout {
    my ($raw_X) = @_;
    $raw_X->get_Section('ServerLayout') ||
      $raw_X->add_Section('ServerLayout', { Identifier => { val => 'layout1' } });
}

#-##############################################################################
#- helpers
#-##############################################################################
sub raw_export_section {
    my ($section, $fields) = @_;

    my $export_name = sub {
	my ($name) = @_;
	my $h = $section->{$name} or return;

	my @l = map { if_(!$_->{commented}, $_->{val}) } deref_array($h) or return;    
	$name => (ref($h) eq 'ARRAY' ? \@l : $l[0]);
    };

    my %h = map { $export_name->($_) } @$fields;
    \%h;
}

sub raw_import_section {
    my ($section, $h, $o_fields) = @_;
    foreach ($o_fields ? grep { exists $h->{$_} } @$o_fields : keys %$h) {
	my @l = map { ref($_) eq 'HASH' ? $_ : { val => $_ } } deref_array($h->{$_});
	$section->{$_} = (ref($h->{$_}) eq 'ARRAY' ? \@l : $l[0]);
    }
}

sub add_Section {
    my ($raw_X, $Section, $h) = @_;
    my @suggested_ordering = qw(Files ServerFlags Module DRI Keyboard Pointer XInput InputDevice Monitor Device Screen ServerLayout);
    my %order = map_index { { lc($_) => $::i } } @suggested_ordering;
    my $e = { name => $Section, l => $h };
    my $added;
    @$raw_X = map { 
	if ($order{lc $_->{name}} > $order{lc $Section} && !$added) {
	    $added = 1;
	    ($e, $_);
	} else { $_ }
    } @$raw_X;
    push @$raw_X, $e if !$added;
    $h;
}
sub remove_Section {
    my ($raw_X, $Section, $o_when) = @_;
    @$raw_X = grep { $_->{name} ne $Section || $o_when && $o_when->($_->{l}) } @$raw_X;
    $raw_X;
}
sub get_Sections {
    my ($raw_X, $Section, $o_when) = @_;
    map { if_($_->{name} eq $Section && (!$o_when || $o_when->($_->{l})), $_->{l}) } @$raw_X;
}
sub get_Section {
    my ($raw_X, $Section, $o_when) = @_;
    my @l = get_Sections($raw_X, $Section, $o_when);
    @l > 1 and log::l("Xconfig: found more than one Section $Section");
    $l[0];
}
sub get_Section_by_Identifier {
    my ($raw_X, $Section, $Identifier) = @_;
    my @l = get_Sections($raw_X, $Section, sub { val($_[0]{Identifier}) eq $Identifier });
    @l > 1 and die "more than one Section $Section has Identifier $Identifier";
    $l[0];
}

sub val {
    my ($ref) = @_;
    $ref && $ref->{val};
}


sub ModeLine_from_string {
    my ($s) = @_;
    my $raw_X_for_ModeLine = Xconfig::parse::read_XF86Config_from_string($s);
    get_Section($raw_X_for_ModeLine, 'Monitor')->{ModeLine};
}



our @resolutions = (
    '640x480', 
    '800x600', 
    '1024x480', '1024x768', 
    '1152x768', '1152x864', 
    '1280x960', '1280x1024', 
    '1400x1050', 
    '1600x1200', 
    '1920x1200', '1920x1440', 
    '2048x1536',
);

our $default_header = <<'END';
# File generated by XFdrake.

# **********************************************************************
# Refer to the XF86Config man page for details about the format of
# this file.
# **********************************************************************

Section "Files"
    # Multiple FontPath entries are allowed (they are concatenated together)
    # By default, Mandrake 6.0 and later now use a font server independent of
    # the X server to render fonts.
    FontPath "unix/:-1"
EndSection

Section "ServerFlags"
    #DontZap # disable <Crtl><Alt><BS> (server abort)
    #DontZoom # disable <Crtl><Alt><KP_+>/<KP_-> (resolution switching)
    AllowMouseOpenFail # allows the server to start up even if the mouse doesn't work
EndSection
END

our $default_ModeLine = arch() =~ /ppc/ ? <<'END_PPC' : <<'END';
    # Apple iMac modes
    ModeLine "1024x768"   78.525 1024 1049 1145 1312   768  769  772  800 +hsync +vsync
    ModeLine "800x600"    62.357  800  821  901 1040   600  601  604  632 +hsync +vsync
    ModeLine "640x480"    49.886  640  661  725  832   480  481  484  514 +hsync +vsync
    # Apple monitors tend to do 832x624
    ModeLine "832x624"    57      832  876  940 1152   624  625  628  667 -hsync -vsync
    # Apple PowerBook G3
    ModeLine "800x600"    100     800  816  824  840   600  616  624  640 -hsync -vsync
    # Apple TI Powerbook 
    ModeLine "1152x768"   78.741 1152 1173 1269 1440   768  769  772  800 +vsync +vsync
    # Pismo Firewire G3   
    ModeLine "1024x768"   65     1024 1032 1176 1344   768  771  777  806 -hsync -vsync
    # iBook2
    ModeLine "1024x768"   65     1024 1048 1184 1344   768  771  777  806 -hsync -vsync
    # 17" Apple Studio Display
    ModeLine "1024x768"   112.62 1024 1076 1248 1420 768 768 780 808 +hsync +vsync
    # HiRes Apple Studio Display
    ModeLine "1280x1024"  135    1280 1288 1392 1664  1024 1027 1030 1064
    # Another variation
    ModeLine "1280x1024"  134.989 1280 1317 1429 1688  1024 1025 1028 1066 +hsync +vsync
END_PPC
    # Sony Vaio C1(X,XS,VE,VN)?
    # 1024x480 @ 85.6 Hz, 48 kHz hsync
    ModeLine "1024x480"    65.00 1024 1032 1176 1344   480  488  494  563 -hsync -vsync
    
    # TV fullscreen mode or DVD fullscreen output.
    # 768x576 @ 79 Hz, 50 kHz hsync
    ModeLine "768x576"     50.00  768  832  846 1000   576  590  595  630
    # 768x576 @ 100 Hz, 61.6 kHz hsync
    ModeLine "768x576"     63.07  768  800  960 1024   576  578  590  616
END

1;