/// Returns the luminance of `$color` as a float (between 0 and 1)
/// 1 is pure white, 0 is pure black
/// @param {Color} $color - Color
/// @return {Number}
/// @link http://stackoverflow.com/a/596241/731172
@function luminance($color) {
  @return (0.375 * red($color) + 0.5 * green($color) + 0.125 * blue($color)) / 255;
}

/// Limits the lighten function to a maximum value
/// @param {Color} $color - Color
/// @param {Number} $amount - The amount to increase the lightness by, between 0% and 100%
/// @param {Number} $max - The maximal lightness amount
/// @return {Color}
@function lightenMax($color, $amount, $max) {
  $enlightedColor: lighten($color, $amount);
  @if lightness($enlightedColor) > $max {
    @return change-color($color, $lightness: $max);
  } @else {
    @return $enlightedColor;
  }
}

$themeColor: hsl(203,67,53);
$fontSize: 12px;
$borderRadius: 5px;

$luminance: luminance($themeColor);
$contrastTextColor: if($luminance > 0.5, inherit, white);
$baseTextColor: if($luminance < 0.2, white, black);

.zammad-chat {
  color: $baseTextColor;
  position: fixed;
  right: 30px;
  bottom: 0;
  font-size: $fontSize;
  width: 33em;
  box-shadow: 0 3px 10px rgba(0,0,0,.3);
  border-radius: $borderRadius $borderRadius 0 0;
  will-change: bottom;
  display: none;
  flex-direction: column;
}
.zammad-chat.zammad-chat-is-open {
  display: flex;
}

.zammad-chat-icon {
  height: 2em;
  fill: currentColor;
  vertical-align: top;
  margin-right: 5px;
  margin-top: 4px;
}

.zammad-chat-header {
  padding: 0.5em 2.5em 0.5em 1em;
  background: $themeColor;
  color: $contrastTextColor;
  line-height: 2.5em;
  box-shadow: 
    0 -1px darken($themeColor, 10%),
    0 1px rgba(255,255,255,.3) inset,
    0 -1px darken($themeColor, 10%) inset,
    0 1px 1px rgba(0,0,0,.13);
  position: relative;
  border-radius: $borderRadius $borderRadius 0 0;
  overflow: hidden;
  cursor: pointer;
}

.zammad-chat-welcome-text {
  font-size: 1.2em;
}

.zammad-chat-toggle {
  position: absolute;
  right: 0;
  top: 0;
  height: 100%;
  width: 3.4em;
  text-align: center;
  line-height: 3.5em;
}

.zammad-chat-toggle-icon-open,
.zammad-chat-toggle-icon-close {
  fill: currentColor;
  height: 0.85em;
}

.zammad-chat-toggle-icon-close,
.zammad-chat.zammad-chat-is-open .zammad-chat-toggle-icon-open {
  display: none;
}

.zammad-chat.zammad-chat-is-open .zammad-chat-toggle-icon-close {
  display: inline;
}

.zammad-chat-agent {
  float: left;
}

.zammad-chat-header-controls {
  float: right;
}

.zammad-chat-agent-avatar {
  border-radius: 100%;
  margin-right: 0.6em;
  float: left;
  width: 2.5em;
}

.zammad-chat-agent-name {
  font-weight: bold;
}

.zammad-chat-agent-status {
  margin: 0 1em;
  display: inline-block;
  line-height: 2em;
  padding: 0 .7em;
  border-radius: 1em;
  background: darken($themeColor, 5%);
  box-shadow: 0 0 0 1px darken($themeColor, 9%);
}

.zammad-chat-agent-status:before {
  content: "";
  background: hsl(19,90%,51%);
  display: inline-block;
  height: 0.9em;
  width: 0.9em;
  border-radius: 100%;
  position: relative;
  margin-right: 0.3em;
  box-shadow: 0 0 0 1px darken($themeColor, 9%);
}

.zammad-chat-agent-status[data-status="online"]:before {
  background: hsl(145,51%,55%);
}

.zammad-chat-agent-status[data-status="connecting"]:before {
  animation: linear connect-fade 600ms infinite alternate;
  background: hsl(41,100%,49%);
}

@keyframes connect-fade {
  from { opacity: .5; transform: scale(0.6); }
  to { opacity: 1; transform: scale(1); }
}

.zammad-chat-modal {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 3.5em;
  margin-top: 1px;
  text-align: center;
  background: radial-gradient(rgba(255,255,255,.75), rgba(255,255,255,1));
  z-index: 1;
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.zammad-chat-modal-text {
  font-size: 1.3em;
  line-height: 1.45;
  
  .zammad-chat-loading-animation {
    font-size: 0.7em;
  }
}

.zammad-chat-modal .zammad-chat-loading-animation {
  margin-right: 8px;
  vertical-align: middle;
}

.zammad-chat-body {
  padding: 0.5em 1em;
  height: 300px;
  overflow: auto;
  background: white;
}

.zammad-chat-status {
  text-align: center;
  color: hsl(0,0%,60%);
  font-size: 0.8em;
  margin: 1em 0;
}

.zammad-chat-message {
  margin: 0.5em 0;
}

.zammad-chat-message-body {
  padding: 0.6em 1em;
  border-radius: 1em;
  background: desaturate(lightenMax($themeColor, 50%, 97%), 50%);
  display: inline-block;
  max-width: 70%;
  white-space: pre;
  box-shadow:
    0 2px rgba(255,255,255,.15) inset,
    0 0 0 1px rgba(0,0,0,.08) inset,
    0 1px rgba(0,0,0,.02);
}

.zammad-chat-message--customer {
  text-align: right;
}

.zammad-chat-message--customer + .zammad-chat-message--agent,
.zammad-chat-message--agent + .zammad-chat-message--customer {
  margin-top: 1em;
}

.zammad-chat-message--customer .zammad-chat-message-body {
  background: $themeColor;
  color: $contrastTextColor;
}

.zammad-chat-message--unread {
  font-weight: bold;
}

.zammad-chat-message--typing .zammad-chat-message-body {
  white-space: normal;
}

.zammad-chat-loading-animation {
  display: inline-block;
}

.zammad-chat-loading-circle {
  background: desaturate(lightenMax($themeColor, 50%, 85%), 15%);
  border-radius: 100%;
  height: 0.72em;
  width: 0.72em;
  display: inline-block;
  animation: ease-in-out load-fade 600ms infinite alternate;
}

.zammad-chat-loading-circle + .zammad-chat-loading-circle {
  animation-delay: .13s;
}

.zammad-chat-loading-circle + .zammad-chat-loading-circle + .zammad-chat-loading-circle {
  animation-delay: .26s;
}

@keyframes load-fade {
  from { opacity: .5; transform: scale(0.6); }
  67% { opacity: 1; transform: scale(1); }
}

.zammad-chat-controls {
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  border-top: 1px solid desaturate(lightenMax($themeColor, 80%, 93%), 10%);
  padding: 0;
  line-height: 1.4em;
  box-shadow: 
    0 1px rgba(0,0,0,.01),
    0 -1px rgba(0,0,0,.02);
  position: relative;
  background: white;
}

.zammad-chat-input {
  float: left;
  font-family: inherit;
  line-height: inherit;
  font-size: inherit;
  appearance: none;
  border: none;
  background: none;
  box-shadow: none;
  padding: 1em 2em;
  outline: none;
  resize: none;
  flex: 1;
  max-height: 6em;
}

.zammad-chat-input::-webkit-input-placeholder {
  color: desaturate(lightenMax($themeColor, 25%, 85%), 50%);
}

.zammad-chat-send {
  appearance: none;
  float: right;
  font-family: inherit;
  font-size: inherit;
  background: $themeColor;
  color: $contrastTextColor;
  padding: 0.6em 1.2em;
  margin: 0.5em 1em 0.5em;
  cursor: pointer;
  border: none;
  border-radius: 1.5em;
  box-shadow:
    0 2px rgba(255,255,255,.25) inset,
    0 0 0 1px darken($themeColor, 10%) inset,
    0 1px rgba(0,0,0,.1);
  outline: none;
}

.zammad-chat-is-hidden {
  display: none;
}

.zammad-chat-is-visible {
  display: block;
}

/*

  # Flat Design
  
*/

.zammad-chat--flat .zammad-chat-header,
.zammad-chat--flat .zammad-chat-body {
  border: none;
}
.zammad-chat--flat .zammad-chat-header {
  box-shadow: 0 1px 1px rgba(0,0,0,.13);
}
.zammad-chat--flat .zammad-chat-message-body {
  box-shadow: 0 0 0 1px rgba(0,0,0,.08) inset;
}
.zammad-chat--flat .zammad-chat-agent-status,
.zammad-chat--flat .zammad-chat-send {
  box-shadow: none;
}

/*

  Mobile Design
  
*/

@media only screen and (max-width: 768px) {
  .zammad-chat {
    left: 0;
    right: 0;
    width: auto;
    height: 100vh;
  }
  .zammad-chat-body {
    height: auto;
    flex: 1;
  }
  .zammad-chat,
  .zammad-chat-header {
    border-radius: 0 !important;
  }
}