//== foundational variables ==//
$black: hsl(0, 0%, 4%) !default;
$white: hsl(0, 0%, 100%) !default;
$light: hsl(0, 0%, 96%) !default; // white-ter
$dark: hsl(0, 0%, 21%) !default;  // grey-darker
$link: hsl(217, 71%, 53%) !default; // blue

$grey-dark: lighten($black, 25%) !default;
$grey-light: darken($light, 25%) !default;
$grey-lighter: darken($light, 10%) !default;

//== datepicker variables ==//
$dp-background-color: $white !default;
$dp-border-color: $grey-lighter !default;
$dp-border-radius: 4px !default;
$dp-border-radius-small: 2px !default;
$dp-line-height-base: 1.5 !default;
$dp-font-size-normal: 1rem !default;
$dp-font-size-small: 0.75rem !default;
$dp-font-weight-semibold: 600 !default;
$dp-font-weight-bold: 700 !default;
$dp-dropdown-offset: 4px !default;
$dp-dropdown-shadow: 0 2px 3px rgba($black, 0.1), 0 0 0 1px rgba($black, 0.1) !default;
$dp-dropdown-z: 20 !default;

$dp-title-background-color: $light !default;

$dp-cell-size-base: 2.25rem !default;
$dp-cell-focus-background-color: darken($light, 5%) !default;
$dp-cell-prevnext-color: hsl(0, 0%, 48%) !default; // grey
$dp-cell-disabled-color: $grey-lighter !default;
$dp-cell-selected-background-color: $link !default;
$dp-cell-selected-color: #fff !default; // link(blue)-invert
$dp-cell-selected-font-weight: 600 !default;
$dp-cell-today-background-color: hsl(171, 100%, 41%) !default;  // turquoise (primary)
$dp-cell-today-color: #fff !default;  // turquoise-invert
$dp-cell-highlighted-background-color: $light !default;
$dp-range-start-end-background-color: $grey-light !default;
$dp-range-start-end-color: $dp-cell-selected-color !default;
$dp-range-background-color: $grey-lighter !default;
$dp-range-today-background-color: $dp-cell-today-background-color !default;
$dp-week-color: $grey-light !default;

$dp-footer-background-color: $light !default;

$dp-input-in-edit-border-color: darken($link, 5%) !default;
$dp-input-in-edit-focus-box-shadow-size: 0 0 0.25em 0.25em !default;

//== non-configurable variables ==//
$dp-cell-shrink-threshold: $dp-cell-size-base * 10;  // = 8 * 1.25
$dp-cell-shrinked-width: $dp-cell-size-base * 7 / 8;

//== mixins ==//
@import 'mixins';

//== styles ==//
.datepicker {
  display: none;

  &.active {
    display: block;
  }
}

.datepicker-dropdown {
  position: absolute;
  top: 0;
  left: 0;
  z-index: $dp-dropdown-z;
  padding-top: $dp-dropdown-offset;

  &.datepicker-orient-top {
    padding-top: 0;
    padding-bottom: $dp-dropdown-offset;
  }
}

.datepicker-picker {
  display: inline-block;
  border-radius: $dp-border-radius;
  background-color: $dp-background-color;

  .datepicker-dropdown & {
    box-shadow: $dp-dropdown-shadow;
  }

  span {
    display: block;
    flex: 1;
    border: 0;
    border-radius: $dp-border-radius;
    cursor: default;
    text-align: center;
    -webkit-touch-callout: none;
    user-select: none;
  }
}

.datepicker-main {
  padding: 2px;
}

.datepicker-footer {
  box-shadow: inset 0 1px 1px rgba($black, 0.1);
  background-color: $dp-footer-background-color;
}

%flex-container {
  display: flex;
}

%flex-wrap {
  flex-wrap: wrap;
}

%flex-basis-day {
  flex-basis: percentage(1 / 7);
}

%flex-basis-month-year {
  flex-basis: 25%;
}

%datepicker-cell-height {
  height: $dp-cell-size-base;
  line-height: $dp-cell-size-base;
}

.datepicker-title {
  box-shadow: inset 0 -1px 1px rgba($black, 0.1);
  background-color: $dp-title-background-color;
  padding: 0.375rem 0.75rem;
  text-align: center;
  font-weight: $dp-font-weight-bold;
}

.datepicker-controls {
  @extend %flex-container;

  .datepicker-header & {
    padding: 2px 2px 0;
  }

  @if mixin-exists(dp-button) {
    @include dp-button;
  } @else {
    .button {
      $button-color: $dark;
      $button-background-color: $white;

      $button-border-color: $grey-lighter;
      $button-border-width: 1px;

      $button-padding-vertical: calc(0.375em - #{$button-border-width});
      $button-padding-horizontal: 0.75em;

      $button-hover-color: $dark; // link-hover
      $button-hover-border-color: $grey-light;  // link-hover-border

      $button-focus-color: $dark; // link-focus
      $button-focus-border-color: $link;  // link-focus-border
      $button-focus-box-shadow-size: 0 0 0 0.125em;
      $button-focus-box-shadow-color: rgba($link, 0.25);

      $button-active-color: $dark;  // link-active
      $button-active-border-color: $grey-dark;  // link-active-border

      display: inline-flex;
      position: relative;
      align-items: center;
      justify-content: center;
      margin: 0;
      border: $button-border-width solid $button-border-color;
      border-radius: $dp-border-radius; // control-radius
      box-shadow: none;
      background-color: $button-background-color;
      cursor: pointer;
      padding: $button-padding-vertical $button-padding-horizontal;
      height: 2.25em; // control-height
      vertical-align: top;
      text-align: center;
      line-height: $dp-line-height-base;  // control-line-height
      white-space: nowrap;
      color: $button-color;
      font-size: $dp-font-size-normal;  // size-normal

      &:focus,
      &:active {
        outline: none;
      }

      &:hover {
        border-color: $button-hover-border-color;
        color: $button-hover-color;
      }

      &:focus {
        border-color: $button-focus-border-color;
        color: $button-focus-color;

        &:not(:active) {
          box-shadow: $button-focus-box-shadow-size $button-focus-box-shadow-color;
        }
      }

      &:active {
        border-color: $button-active-border-color;
        color: $button-active-color;
      }

      &[disabled] {
        cursor: not-allowed;
      }

      .datepicker-header & {
        @include dp-header-button-common;

        &:hover {
          background-color: darken($white, 2.5%);
        }

        &:focus {
          &:not(:active) {
            box-shadow: 0 0 0 0.125em rgba($white, 0.25);
          }
        }

        &:active {
          background-color: darken($white, 5%);
        }

        &[disabled] {
          box-shadow: none;
        }
      }

      .datepicker-footer & {
        @include dp-footer-button-common;
      }
    }
  }

  .view-switch {
    flex: auto;
  }

  .prev-btn,
  .next-btn {
    padding-right: 0.375rem;
    padding-left: 0.375rem;
    width: $dp-cell-size-base;

    &.disabled {
      visibility: hidden;
    }
  }
}

.datepicker-view {
  @extend %flex-container;

  .days-of-week {
    @extend %flex-container;
  }

  .dow {
    @extend %flex-basis-day;
    height: $dp-font-size-normal * $dp-line-height-base;
    line-height: $dp-font-size-normal * $dp-line-height-base;
    font-size: ($dp-font-size-small + $dp-font-size-normal) / 2;
    font-weight: $dp-font-weight-bold;
  }

  .week {
    @extend %datepicker-cell-height;
    width: $dp-cell-size-base;
    color: $dp-week-color;
    font-size: $dp-font-size-small;

    @media (max-width: $dp-cell-shrink-threshold) {
      width: $dp-cell-shrinked-width;
    }
  }
}

.datepicker-grid {
  @extend %flex-container;
  @extend %flex-wrap;

  width: $dp-cell-size-base * 7;

  @media (max-width: $dp-cell-shrink-threshold) {
    .calendar-weeks + .days & {
      width: $dp-cell-shrinked-width * 7;
    }
  }
}

.datepicker-cell {
  @extend %datepicker-cell-height;

  &:not(.disabled):hover {
    background-color: darken($dp-background-color, 2.5%);
    cursor: pointer;
  }

  &.focused:not(.selected) {
    background-color: $dp-cell-focus-background-color;
  }

  &.selected {
    &,
    &:hover {
      background-color: $dp-cell-selected-background-color;
      color: $dp-cell-selected-color;
      font-weight: $dp-cell-selected-font-weight;
    }
  }

  &.disabled {
    color: $dp-cell-disabled-color;
  }

  &.prev,
  &.next {
    &:not(.disabled) {
      color: $dp-cell-prevnext-color;
    }

    &.selected {
      color: darken($dp-cell-selected-color, 10%);
    }
  }

  &.highlighted:not(.selected):not(.range):not(.today) {
    border-radius: 0;
    background-color: $dp-cell-highlighted-background-color;

    &:not(.disabled):hover {
      background-color: darken($dp-cell-highlighted-background-color, 2.5%);
    }

    &.focused {
      background-color: $dp-cell-focus-background-color;
    }
  }

  &.today {
    &:not(.selected) {
      background-color: $dp-cell-today-background-color;

      &:not(.disabled) {
        color: $dp-cell-today-color;
      }
    }

    &.focused:not(.selected) {
      background-color: darken($dp-cell-today-background-color, 2.5%);
    }
  }

  &%range-start-end-common {
    background-color: $dp-range-start-end-background-color;
    color: $dp-range-start-end-color;
  }

  &%range-start-end-focused-common {
    background-color: darken($dp-range-start-end-background-color, 2.5%);
  }

  &.range-start {
    border-radius: $dp-border-radius 0 0 $dp-border-radius;

    &:not(.selected) {
      @extend %range-start-end-common;
    }

    &.focused:not(.selected) {
      @extend %range-start-end-focused-common;
    }
  }

  &.range-end {
    border-radius: 0 $dp-border-radius $dp-border-radius 0;

    &:not(.selected) {
      @extend %range-start-end-common;
    }

    &.focused:not(.selected) {
      @extend %range-start-end-focused-common;
    }
  }

  &.range {
    border-radius: 0;
    background-color: $dp-range-background-color;

    &:not(.disabled):not(.focused):not(.today):hover {
      background-color: darken($dp-range-background-color, 2.5%);
    }

    &.disabled {
      color: darken($dp-range-background-color, 10%);
    }

    &.focused {
      background-color: darken($dp-range-background-color, 5%);
    }

    @if $dp-range-today-background-color != $dp-cell-today-background-color {
      &.today {
        background-color: $dp-range-today-background-color;
      }
    }
  }

  .datepicker-view .days & {
    @extend %flex-basis-day;
  }

  .datepicker-view.datepicker-grid & {
    @extend %flex-basis-month-year;
    height: $dp-cell-size-base * 2;
    line-height: $dp-cell-size-base * 2;
  }
}

.datepicker-input.in-edit {
  border-color: $dp-input-in-edit-border-color;

  &:focus,
  &:active {
    box-shadow: $dp-input-in-edit-focus-box-shadow-size rgba($dp-input-in-edit-border-color, 0.2);
  }
}