@use 'ui-design-system/src/styles/semantic/index' as *;

.ui-split-button {
  // Reset and base styles
  display: inline-flex;
  align-items: center;
  position: relative;
  border-radius: $semantic-border-radius-md;
  overflow: hidden;
  
  // Size variants
  &--small {
    height: $semantic-spacing-9; // 2.25rem
    
    .ui-split-button__primary,
    .ui-split-button__dropdown {
      font-size: $semantic-typography-font-size-sm;
      line-height: $semantic-typography-line-height-tight;
    }
  }
  
  &--medium {
    height: $semantic-spacing-11; // 2.75rem
    
    .ui-split-button__primary,
    .ui-split-button__dropdown {
      font-size: $semantic-typography-font-size-md;
      line-height: $semantic-typography-line-height-normal;
    }
  }
  
  &--large {
    height: $semantic-spacing-12; // 3rem
    
    .ui-split-button__primary,
    .ui-split-button__dropdown {
      font-size: $semantic-typography-font-size-lg;
      line-height: $semantic-typography-line-height-normal;
    }
  }
  
  // Full width variant
  &--full-width {
    width: 100%;
  }
  
  // Disabled state
  &--disabled {
    opacity: 0.38;
    cursor: not-allowed;
    pointer-events: none;
  }

  // Primary button part
  &__primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    text-decoration: none;
    outline: none;
    flex: 1;
    height: 100%; // Match the container height
    
    // Default colors (filled variant)
    background-color: $semantic-color-interactive-primary;
    color: $semantic-color-on-primary;
    
    // Typography
    font-family: $semantic-typography-font-family-sans;
    font-size: $semantic-typography-font-size-md; // Default medium size
    font-weight: $semantic-typography-font-weight-medium;
    line-height: $semantic-typography-line-height-normal; // Default medium line-height
    text-align: center;
    text-transform: none;
    letter-spacing: $semantic-typography-letter-spacing-normal;
    white-space: nowrap;
    
    // Interaction states
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    box-sizing: border-box;
    
    // Transitions
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    
    // Default hover state
    &:hover:not(:disabled) {
      background-color: $semantic-color-primary;
      transform: translateY(-1px);
      box-shadow: $semantic-shadow-button-hover;
    }
    
    &:active:not(:disabled) {
      transform: scale(0.98);
      box-shadow: $semantic-shadow-button-active;
    }
    
    &:focus-visible {
      outline: 2px solid $semantic-color-primary;
      outline-offset: 2px;
    }
    
    // Size-specific padding
    .ui-split-button--small & {
      padding: 0 $semantic-spacing-3; // 0.75rem
    }
    
    .ui-split-button--medium & {
      padding: 0 $semantic-spacing-4; // 1rem
    }
    
    .ui-split-button--large & {
      padding: 0 $semantic-spacing-6; // 1.5rem
    }
  }

  // Dropdown button part
  &__dropdown {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    outline: none;
    position: relative;
    
    // Default colors (filled variant)
    background-color: $semantic-color-interactive-primary;
    color: $semantic-color-on-primary;
    
    // Typography
    font-family: $semantic-typography-font-family-sans;
    font-size: $semantic-typography-font-size-md; // Default medium size
    font-weight: $semantic-typography-font-weight-medium;
    line-height: $semantic-typography-line-height-normal; // Default medium line-height
    
    // Default size (medium) - defaults only
    width: $semantic-spacing-9; // Default to medium size
    padding: 0 $semantic-spacing-2-5; // Default medium padding
    
    // Interaction states
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    box-sizing: border-box;
    
    // Transitions
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    
    // Default hover state
    &:hover:not(:disabled) {
      background-color: $semantic-color-primary;
      transform: translateY(-1px);
      box-shadow: $semantic-shadow-button-hover;
    }
    
    &:active:not(:disabled) {
      transform: scale(0.98);
      box-shadow: $semantic-shadow-button-active;
    }
    
    &:focus-visible {
      outline: 2px solid $semantic-color-primary;
      outline-offset: 2px;
    }
    
    // Divider between buttons
    &::before {
      content: '';
      position: absolute;
      left: 0;
      top: 20%;
      height: 60%;
      width: 1px;
      background-color: currentColor;
      opacity: 0.3;
    }
  }

  // Size-specific dropdown dimensions (must come after default styles)
  &--small &__dropdown {
    width: $semantic-spacing-8; // 2rem - slightly smaller than height
    height: $semantic-spacing-9; // Match small container height
    padding: 0 $semantic-spacing-2; // 0.5rem
  }
  
  &--medium &__dropdown {
    width: $semantic-spacing-9; // 2.25rem - smaller than height 
    height: $semantic-spacing-11; // Match medium container height
    padding: 0 $semantic-spacing-2-5; // 0.625rem
  }
  
  &--large &__dropdown {
    width: $semantic-spacing-10; // 2.5rem - smaller than height
    height: $semantic-spacing-12; // Match large container height
    padding: 0 $semantic-spacing-3; // 0.75rem
  }

  // Content wrapper
  &__content {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  // Icon styles
  &__icon {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;

    &--left {
      margin-right: $semantic-spacing-2; // 0.5rem
    }

    &--right {
      margin-left: $semantic-spacing-2; // 0.5rem
    }
    
    // Size-specific adjustments
    .ui-split-button--small & {
      font-size: $semantic-typography-font-size-xs;
      
      &--left {
        margin-right: $semantic-spacing-1-5; // 0.375rem
      }
      
      &--right {
        margin-left: $semantic-spacing-1-5; // 0.375rem
      }
    }

    .ui-split-button--medium & {
      font-size: $semantic-typography-font-size-sm;
    }

    .ui-split-button--large & {
      font-size: $semantic-typography-font-size-md;
      
      &--left {
        margin-right: $semantic-spacing-2-5; // 0.625rem
      }
      
      &--right {
        margin-left: $semantic-spacing-2-5; // 0.625rem
      }
    }
  }

  // Dropdown arrow
  &__arrow {
    display: inline-flex;
    align-items: center;
    font-size: 0.875em; // Slightly larger for better visibility
    transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
  }

  // Dropdown menu
  &__menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 100%;
    background: $semantic-color-surface-elevated;
    border: $semantic-border-width-1 solid $semantic-color-border-primary;
    border-radius: $semantic-border-radius-md;
    box-shadow: $semantic-shadow-dropdown;
    z-index: $semantic-z-index-dropdown;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-$semantic-spacing-2);
    transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
    
    &--open {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
  }

  // Menu item
  &__menu-item {
    display: flex;
    align-items: center;
    width: 100%;
    padding: $semantic-spacing-3 $semantic-spacing-4;
    border: none;
    background: transparent;
    color: $semantic-color-text-primary;
    font-family: $semantic-typography-font-family-sans;
    font-size: $semantic-typography-font-size-sm;
    font-weight: $semantic-typography-font-weight-normal;
    text-align: left;
    cursor: pointer;
    transition: background-color 200ms cubic-bezier(0.4, 0, 0.2, 1);
    
    &:hover {
      background: $semantic-color-surface-container;
    }
    
    &:first-child {
      border-top-left-radius: $semantic-border-radius-md;
      border-top-right-radius: $semantic-border-radius-md;
    }
    
    &:last-child {
      border-bottom-left-radius: $semantic-border-radius-md;
      border-bottom-right-radius: $semantic-border-radius-md;
    }
  }

  // Filled variant (primary)
  &--filled {
    .ui-split-button__primary,
    .ui-split-button__dropdown {
      background-color: $semantic-color-interactive-primary;
      color: $semantic-color-on-primary;
      
      &:hover:not(:disabled) {
        background-color: $semantic-color-primary;
        transform: translateY(-1px);
        box-shadow: $semantic-shadow-button-hover;
      }
      
      &:active:not(:disabled) {
        transform: scale(0.98);
        box-shadow: $semantic-shadow-button-active;
      }
      
      &:focus-visible {
        outline: 2px solid $semantic-color-primary;
        outline-offset: 2px;
      }
    }
    
    .ui-split-button__dropdown:hover .ui-split-button__arrow {
      transform: rotate(180deg);
    }
  }

  // Tonal variant
  &--tonal {
    .ui-split-button__primary,
    .ui-split-button__dropdown {
      background-color: $semantic-color-surface-container;
      color: $semantic-color-text-primary;
      
      &:hover:not(:disabled) {
        background-color: $semantic-color-surface-container;
        transform: translateY(-1px);
        box-shadow: $semantic-shadow-button-hover;
        filter: brightness(0.95);
      }
      
      &:active:not(:disabled) {
        transform: scale(0.98);
      }
      
      &:focus-visible {
        outline: 2px solid $semantic-color-primary;
        outline-offset: 2px;
      }
    }
    
    .ui-split-button__dropdown:hover .ui-split-button__arrow {
      transform: rotate(180deg);
    }
  }

  // Outlined variant
  &--outlined {
    border: $semantic-border-width-1 solid $semantic-color-border-primary;
    
    .ui-split-button__primary,
    .ui-split-button__dropdown {
      background-color: transparent;
      color: $semantic-color-interactive-primary;
      
      &:hover:not(:disabled) {
        background-color: $semantic-color-surface-container;
        transform: translateY(-1px);
      }
      
      &:active:not(:disabled) {
        background-color: $semantic-color-surface-container;
        transform: scale(0.98);
        filter: brightness(0.9);
      }
      
      &:focus-visible {
        outline: 2px solid $semantic-color-primary;
        outline-offset: 2px;
      }
    }
    
    .ui-split-button__dropdown:hover .ui-split-button__arrow {
      transform: rotate(180deg);
    }
  }

  // Loading state
  &--loading {
    .ui-split-button__primary {
      cursor: wait;
      
      .ui-split-button__content {
        opacity: 0;
      }
    }
    
    .ui-split-button__dropdown {
      pointer-events: none;
      opacity: 0.5;
    }
  }

  // Loader
  &__loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
  }

  &__spinner {
    width: $semantic-spacing-4; // 1rem
    height: $semantic-spacing-4; // 1rem
    border: 2px solid currentColor;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    opacity: 0.7;
  }

  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  // Ripple effect
  .ui-split-button__primary::after,
  .ui-split-button__dropdown::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
    transform: scale(0);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .ui-split-button__primary:active:not(:disabled)::after,
  .ui-split-button__dropdown:active:not(:disabled)::after {
    transform: scale(1);
    opacity: 1;
    transition: none;
  }
}