//
// Copyright 2021 Google Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

@use 'sass:list';
@use 'sass:map';

// A collection of extensions to the sass:map module
// https://sass-lang.com/documentation/modules/map

/// Splits a Map into two separate Maps: one without the provided keys and one
/// exclusively with the provided keys.
///
/// @example - scss
///   $map: (
///     focus: blue,
///     focus-within: blue,
///     hover: teal,
///     active: green,
///   );
///
///   $pair: split($map, focus, focus-within);
///   // (
///   //   (hover: teal, active: green),
///   //   (focus: blue, focus-within: blue)
///   // );
///
/// @param {Map} $map - The Map to split.
/// @param {String...} $keys - Keys to split the Map by.
/// @return {List} A List pair with two new Maps: the first with the keys
///     removed and the second exclusively with the keys.
@function split($map, $keys...) {
  $map1: ();
  $map2: ();
  @each $key, $value in $map {
    @if list.index($keys, $key) {
      $map2: map.set($map2, $key, $value);
    } @else {
      $map1: map.set($map1, $key, $value);
    }
  }

  @return ($map1, $map2);
}

/// Picks provided keys from a Map.
///
/// @example - scss
///   $map: (
///     focus: blue,
///     focus-within: blue,
///     hover: teal,
///     active: green,
///   );
///
///   pick($map, hover, active);
///   // (hover: teal, active: green),
///
///   pick($map, (hover, active)...);
///   // (hover: teal, active: green),
///
/// @param {Map} $map - The Map to pick.
/// @param {String...} $keys - Keys to pick from the Map.
/// @return {List} Map with only the keys provided.
@function pick($map, $keys...) {
  @return list.nth(split($map, $keys...), 2);
}

///
/// trim-keys returns the given map with any matching keys removed.
///
/// @example
///   trim-keys(('foo': red, 'bar': 5), ('foo')) = ('bar': 5)
///
/// @param {Map} $map - the map to rename.
/// @param {List} $keys - the key names to trim off.
/// @return {Map} the $map with any matching keys removed.
///
@function trim-keys($map, $keys) {
  $out: map.merge($map, ());
  @each $key, $value in $map {
    @if list.index($keys, $key) {
      $out: map.remove($out, $key);
    }
  }
  @return $out;
}

///
/// rename-keys returns the given map with any matching keys renamed to the
/// given name.
///
/// @example
///   rename-keys(('foo': red), ('foo': 'bar')) = ('bar': red)
///
/// @param {Map} $map - the map to rename.
/// @param {Map} $rename - the renames to apply.
/// @return {Map} the $map with any matching keys renamed per $rename.
///
@function rename-keys($map, $rename) {
  $out: trim-keys($map, map.keys($rename));
  @each $from, $to in $rename {
    @if map.has-key($map, $from) {
      $out: map.set($out, $to, map.get($map, $from));
    }
  }
  @return $out;
}

/// Useful to avoid typos in the key string when accessing a map where the
/// key is expected to exist.
///
/// @param {Map} $map - the map that contains the key.
/// @param {String} $key - the key the value of which we want to retrieve.
@function map-get-or-err($map, $key) {
  @if not map.has-key($map, $key) {
    @error 'Key #{$key} expected but not found in argument map.';
  }

  @return map.get($map, $key);
}