// Solid color image
@function _solid($c) {
  @return linear-gradient(to bottom, $c, $c);
}

// Entries

@mixin entry($t) {
//
// Entries drawing function
//
// $t: entry type
//

  @if $t==normal {
  //
  // normal entry
  //
    color: $text_color;
    background-color: $entry_bg;
    box-shadow: inset 0 0 0 2px transparent;
  }

  @if $t==hover {
  //
  // hover entry
  //
    color: $text_color;
    background-color: $entry_bg;
    box-shadow: inset 0 0 0 1px rgba($borders_color, 0.05), inset 0 0 0 2px transparent;
    transition-duration: $shorter_duration * 2;
  }

  @if $t==focus {
  //
  // focused entry
  //
    color: $text_color;
    background-color: $entry_bg;
    box-shadow: inset 0 0 0 2px $entry_highlight;
    transition-duration: $longer_duration * 2;
  }

  @if $t==insensitive {
  //
  // insensitive entry
  //
    color: $disabled_fg_color;
    background-color: rgba($entry_bg, 0.02);
  }

  @if $t==header-normal {
  //
  // normal header-bar entry
  //
    color: $header_fg;
    background-color: $entry_bg;
    box-shadow: inset 0 0 0 2px transparent;

    image, image:hover { color: inherit; }
  }

  @if $t==header-hover {
  //
  // header-hover entry
  //
    color: $header_fg;
    background-color: $entry_bg;
    box-shadow: inset 0 0 0 1px rgba($borders_color, 0.05), inset 0 0 0 2px transparent;
    transition-duration: $shorter_duration * 2;
  }

  @if $t==header-focus {
  //
  // focused header-bar entry
  //
    // border-color: $selection_mode_bg;
    background-image: none;
    background-color: $entry_bg;
    box-shadow: inset 0 0 0 2px $entry_highlight;
  }

  @if $t==header-insensitive {
  //
  // insensitive header-bar entry
  //
    color: rgba($header_fg, 0.35);
    background-color: rgba($entry_bg, 0.02);
  }

  @else if $t==osd {
  //
  // normal osd entry
  //
    color: $osd_fg_color;
    border-color: $osd_entry_border;
    background-color: $osd_entry_bg;

    image, image:hover { color: inherit; }
  }

  @else if $t==osd-focus {
  //
  // active osd entry
  //
    color: $selected_fg_color;
    border-color: darken($selection_mode_bg, 5%);
    background-color: $selected_bg_color;
  }

  @else if $t==osd-insensitive {
  //
  // insensitive osd entry
  //
    color: $osd_disabled_fg_color;
    background-color: transparentize($osd_entry_bg, 0.15);
  }
}

// Buttons

@mixin button($t, $actionb_bg: red, $actionb_fg: green) {
//
// Button drawing function
//
// $t:    button type,
// $actionb_bg, $actionb_fg: used for destructive and suggested action buttons

  @if $t==normal {
  //
  // normal button
  //
    color: $fg_color;
    border-color: $button_borders;
    background-color: $button_bg;
    @if $variant=='light' { box-shadow: $shadow_3; }
    @if $variant=='dark' {
      box-shadow: inset 0 1px $button_highlight, inset 0 -1px rgba(white, 0.02), $shadow_3;
    }
  }

  @else if $t==hover {
  //
  // hovered button
  //
    color: if($variant == 'light', darken($fg_color, 10%), lighten($fg_color, 10%));
    border-color: $button_borders_hover;
    background-color: if($variant=='light', darken($button_bg, 3%), lighten($button_bg, 3%));
    @if $variant=='light' { box-shadow: none; }
    @if $variant=='dark' {
      box-shadow: inset 0 1px rgba($button_highlight, 0.12), $shadow_3;
    }
  }

  @else if $t==active {
  //
  // pushed button
  //
    color: $selected_fg_color;
    background-color: $selected_bg_color;
    border-color: if($variant=='light', $selected_bg_color, $dark_borders_color);
    @if $variant=='light' { box-shadow: none; }
  }

  @else if $t==insensitive {
  //
  // insensitive button
  //
    label, & { color: $disabled_fg_color; }

    border-color: if($variant == 'light', $button_border, $dark_borders_color);
    background-color: rgba($button_bg, 0.55);
    box-shadow: none;
  }

  @else if $t==insensitive-active {
  //
  // insensitive pushed button
  //
    label, & { color: transparentize($selected_fg_color, 0.45); }

    border-color: if($variant == 'light', transparentize($selected_bg_color, 1), $dark_borders_color);
    background-color: transparentize($selected_bg_color, 0.45);
    @if $variant=='light' { box-shadow: none; }

    opacity: 0.6;
  }

  @if $t==flat-normal {
  //
  // normal button
  //
    border: none;
    background-color: transparent;
    box-shadow: none;
    background-clip: if($variant=='light', border-box, padding-box);
  }

  @else if $t==flat-hover {
  //
  // hovered button
  //
    color: darken($fg_color, 10%);
    background-color: if($variant=='light', rgba(black, 0.15), rgba(white, 0.15));
    background-image: none;
    box-shadow: none;
    // border-color: if($variant=='light', rgba(black, 0.15), rgba(white, 0.15));
  }

  @else if $t==flat-active {
  //
  // pushed button
  //
    background-image: none;
    color: $selected_fg_color;
    background-color: if($variant=='light', rgba(black, 0.5), rgba(white, 0.25));
  }

  @else if $t==flat-checked {
  //
  // pushed button
  //
    background-image: none;
    color: $selected_fg_color;
    background-color: if($variant=='light', rgba(black, 0.65), rgba(white, 0.35));
  }

  @else if $t==flat-insensitive {
  //
  // insensitive button
  //
    label, & { color: $disabled_fg_color; }

    background-color: transparent;
//    border: none;
  }

  @else if $t==flat-insensitive-active {
  //
  // insensitive pushed button
  //
    label, & { color: transparentize($selected_fg_color, 0.2); }

    background-color: lighten($fg_color, 20%);
    opacity: 0.6;
  }

  @if $t==header-normal {
  //
  // normal header-bar button
  //
    color: $header_fg;
    background-color: transparent;
    background-image: none;
    border: none;
    box-shadow: none;
  }

  @else if $t==header-hover {
  //
  // hovered header-bar button
  //
    color: darken($header_fg, 2%);
    background-color: rgba($header_fg, 0.1);
    background-image: none;
    box-shadow: none;
  }

  @else if $t==header-active {
  //
  // pushed header-bar button
  //
    color: $header_fg;
    background-color: rgba($header_fg, 0.25);
    background-image: none;
    box-shadow: none;
  }

  @else if $t==header-checked {
  //
  // pushed header-bar button
  //
    color: $header_fg;
    background-color: rgba($header_fg, 0.12);
    background-image: none;
    box-shadow: none;
  }

  @else if $t==header-insensitive {
  //
  // insensitive header-bar button
  //
    label, & { color: rgba($header_fg, 0.35); }
    background-image: none;
    background-color: transparent;
    box-shadow: none;
  }

  @else if $t==header-insensitive-active {
  //
  // header-bar insensitive pushed button
  //
    color: rgba($header_fg, 0.35);
    background-image: none;
    background-color: transparent;
  }

  @else if $t==osd {
  //
  // normal osd button
  //
    color: $osd_fg_color;
    border-color: $osd_button_border;
    background-color: $osd_button_bg;
    box-shadow: none;
  }

  @else if $t==osd-hover {
  //
  // active osd button
  //
    color: $osd_fg_color;
    border-color: $osd_button_border;
    background-color: opacify(lighten($osd_button_bg, 7%), 0.1);
    box-shadow: none;
  }

  @else if $t==osd-active {
  //
  // active osd button
  //
    color: $selected_fg_color;
    border-color: $osd_button_border;
    background-color: $selected_bg_color;
    background-image: none;
    box-shadow: none;
    background-clip: padding-box;
  }

  @else if $t==osd-insensitive {
  //
  // insensitive osd button
  //
    color: $osd_disabled_fg_color;
    border-color: $osd_button_border;
    background-color: transparentize($osd_button_bg, 0.15);
    box-shadow: none;
  }

  @else if $t==suggested_destructive {
  //
  // suggested or destructive action buttons
  //
    @if $variant == 'light' { background-clip: border-box; }

    color: $actionb_fg;
    background-color: $actionb_bg;
    border-color: if($variant == 'light', darken($actionb_bg, 6%), $dark_borders_color);
    background-image: none;
    box-shadow: if($variant=='light', none, (inset 0 1px rgba(white, 0.15), inset 0 -1px rgba(white, 0.03)));
  }

  @else if $t==undecorated {
  //
  // reset
  //
    border-color: transparent;
    background-color: transparent;
    background-image: none;
    box-shadow: none;
  }
}

//
// Overshoot
//
@mixin overshoot($p, $t:normal, $c:$fg_color) {
//
// overshoot
//
// $p: position
// $t: type
// $c: base color
//
// possible $p values:
// top, bottom, right, left
//
// possible $t values:
// normal, backdrop
//

  $_small_gradient_length: 5%;
  $_big_gradient_length: 100%;

  $_position: center top;
  $_small_gradient_size: 100% $_small_gradient_length;
  $_big_gradient_size: 100% $_big_gradient_length;

  @if $p==bottom {
    $_position: center bottom;
    $_linear_gradient_direction: to top;
  }

  @else if $p==right {
    $_position: right center;
    $_small_gradient_size: $_small_gradient_length 100%;
    $_big_gradient_size: $_big_gradient_length 100%;
  }

  @else if $p==left {
    $_position: left center;
    $_small_gradient_size: $_small_gradient_length 100%;
    $_big_gradient_size: $_big_gradient_length 100%;
  }

  $_small_gradient_color: $c;
  $_big_gradient_color: $c;

  @if $c==$fg_color {
    $_small_gradient_color: $borders_color;
    $_big_gradient_color: $text_color;

    @if $t==backdrop { $_small_gradient_color: $fill_color; }
  }

  $_small_gradient: -gtk-gradient(radial,
                                  $_position, 0,
                                  $_position, 0.5,
                                  to($_small_gradient_color),
                                  to(rgba($_small_gradient_color, 0)));

  $_big_gradient: -gtk-gradient(radial,
                                $_position, 0,
                                $_position, 0.6,
                                from(rgba($_big_gradient_color, 0.07)),
                                to(rgba($_big_gradient_color, 0)));

  @if $t==normal {
    background-image: $_small_gradient, $_big_gradient;
    background-size: $_small_gradient_size, $_big_gradient_size;
  }

  @else if $t==backdrop {
    background-image: $_small_gradient;
    background-size: $_small_gradient_size;
  }

  background-repeat: no-repeat;
  background-position: $_position;

  background-color: transparent; // reset some properties to be sure to not inherit them somehow
  border: none;                  //
  box-shadow: none;              //
}

@mixin overshoot_alt($p) {
//
// overshoot
//
// $p: position
//
// possible $p values:
// top, bottom, right, left
//

  $_small_gradient_length: 3%;
  $_big_gradient_length: 50%;

  $_small_gradient_size: 100% $_small_gradient_length;
  $_big_gradient_size: 100% $_big_gradient_length;

  @if $p==right or $p==left {
    $_small_gradient_size: $_small_gradient_length 100%;
    $_big_gradient_size: $_big_gradient_length 100%;
  }

  $_small_gradient: radial-gradient(farthest-side at $p,
                                    gtkalpha(currentColor, 0.12) 85%,
                                    gtkalpha(currentColor, 0));

  $_big_gradient: radial-gradient(farthest-side at $p,
                                  gtkalpha(currentColor, 0.05),
                                  gtkalpha(currentColor, 0));

  background-image: $_small_gradient, $_big_gradient;
  background-size: $_small_gradient_size, $_big_gradient_size;

  background-repeat: no-repeat;
  background-position: $p;

  background-color: transparent; // reset some properties to be sure to not inherit them somehow
  border: none;                  //
  box-shadow: none;              //
}

//
// Undershoot
//
@mixin undershoot($p) {
// $p: position
//
// possible $p values:
// top, bottom, right, left
//

  $_undershoot_color_dark: transparentize(black, 0.8);
  $_undershoot_color_light: transparentize(white, 0.8);

  $_gradient_dir: left;
  $_dash_bg_size: 10px 1px;
  $_gradient_repeat: repeat-x;
  $_bg_pos: center $p;

  background-color: transparent; // shouldn't be needed, but better to be sure;

  @if ($p == left) or ($p == right) {
    $_gradient_dir: top;
    $_dash_bg_size: 1px 10px;
    $_gradient_repeat: repeat-y;
    $_bg_pos: $p center;
  }

  background-image: linear-gradient(to $_gradient_dir, // this is the dashed line
                                    $_undershoot_color_light 50%,
                                    $_undershoot_color_dark 50%);

  padding-#{$p}: 1px;
  background-size: $_dash_bg_size;
  background-repeat: $_gradient_repeat;
  background-origin: content-box;
  background-position: $_bg_pos;
  border: none;
}