// -----------------------------------------------------------------------------
// Block constructor
// -----------------------------------------------------------------------------

/// Set namespaces for each block type
/// @public

$bem-block-namespaces: (
    'utility': 'u',
    'object': 'o',
    'component': 'c',
) !default;

/// Initializes a new block object
/// @private
/// @param {String} $block  - Name for the new block
/// @param {String} $type   - Block type: (utility, object or component)
/// @returns The final selector for the new block object

@function _block($name, $type) {

    // Log new block
    $new-block: _bem-log-block($name);

    // Error check
    $outside-check: _should-not-be-called-within('scope', 'block');

    // Return false in case error throwing is disabled
    @if $outside-check == false {
        @return false;
    }

    // Set namespace
    $namespace: '';

    @if $bem-use-namespaces {
        @if not map-has-key($bem-block-namespaces, $type) {
            @if $bem-throw-errors {
                @error '`#{$type}` is not a valid `$type` for `block()`';
            }

            @return false;
        }
        $namespace: map-get($bem-block-namespaces, $type) + '-';
    }

    $selector: '.' + $namespace + $name;
    $set-current: set-current-context('block', $name, $selector);

    @return $selector;
}


/// Creates a block object with the given type
/// @param {String} $block  - Name for the new block
/// @param {String} $type   - Block type: (utility, object or component)

@mixin block($name, $type) {

    // Write block selector
    @at-root #{_block($name, $type)} {
        @content;
    }

    // Clear $_bem-current-context block after creation
    $unset-current: unset-current-context('block');
}


// -----------------------------------------------------------------------------
// 2. Utility alias
// -----------------------------------------------------------------------------

@mixin utility($name) {
    @include block($name, 'utility') {
        @content;
    }
}


// -----------------------------------------------------------------------------
// 3. Object alias
// -----------------------------------------------------------------------------

@mixin object($name) {
  @include block($name, 'object') {
    @content;
  }
}


// -----------------------------------------------------------------------------
// 4. Component alias
// -----------------------------------------------------------------------------

@mixin component($name) {
  @include block($name, 'component') {
    @content;
  }
}