2 files changed, 988 insertions, 0 deletions
diff --git a/src/services/theme_data/pleromafe.js b/src/services/theme_data/pleromafe.js
new file mode 100644
index 00000000..33a2ed57
--- /dev/null
+++ b/src/services/theme_data/pleromafe.js
@@ -0,0 +1,615 @@
+import { invertLightness, brightness } from 'chromatism'
+import { alphaBlend, mixrgb } from '../color_convert/color_convert.js'
+/* This is a definition of all layer combinations
+ * each key is a topmost layer, each value represents layer underneath
+ * this is essentially a simplified tree
+ */
+export const LAYERS = {
+  undelay: null, // root
+  topBar: null, // no transparency support
+  badge: null, //  no transparency support
+  fg: null,
+  bg: 'underlay',
+  highlight: 'bg',
+  panel: 'bg',
+  popover: 'bg',
+  selectedMenu: 'popover',
+  btn: 'bg',
+  btnPanel: 'panel',
+  btnTopBar: 'topBar',
+  input: 'bg',
+  inputPanel: 'panel',
+  inputTopBar: 'topBar',
+  alert: 'bg',
+  alertPanel: 'panel',
+  poll: 'bg'
+}
+
+/* By default opacity slots have 1 as default opacity
+ * this allows redefining it to something else
+ */
+export const DEFAULT_OPACITY = {
+  alert: 0.5,
+  input: 0.5,
+  faint: 0.5,
+  underlay: 0.15
+}
+
+/**  SUBJECT TO CHANGE IN THE FUTURE, this is all beta
+ * Color and opacity slots definitions. Each key represents a slot.
+ *
+ * Short-hands:
+ * String beginning with `--` - value after dashes treated as sole
+ *     dependency - i.e. `--value` equivalent to { depends: ['value']}
+ * String beginning with `#` - value would be treated as solid color
+ *     defined in hexadecimal representation (i.e. #FFFFFF) and will be
+ *     used as default. `#FFFFFF` is equivalent to { default: '#FFFFFF'}
+ *
+ * Full definition:
+ * @property {String[]} depends - color slot names this color depends ones.
+ *   cyclic dependencies are supported to some extent but not recommended.
+ * @property {String} [opacity] - opacity slot used by this color slot.
+ *   opacity is inherited from parents. To break inheritance graph use null
+ * @property {Number} [priority] - EXPERIMENTAL. used to pre-sort slots so
+ *   that slots with higher priority come earlier
+ * @property {Function(mod, ...colors)} [color] - function that will be
+ *   used to determine the color. By default it just copies first color in
+ *   dependency list.
+ * @argument {Number} mod - `1` (light-on-dark) or `-1` (dark-on-light)
+ *   depending on background color (for textColor)/given color.
+ * @argument {...Object} deps - each argument after mod represents each
+ *   color from `depends` array. All colors take user customizations into
+ *   account and represented by { r, g, b } objects.
+ * @returns {Object} resulting color, should be in { r, g, b } form
+ *
+ * @property {Boolean|String} [textColor] - true to mark color slot as text
+ *   color. This enables automatic text color generation for the slot. Use
+ *   'preserve' string if you don't want text color to fall back to
+ *   black/white. Use 'bw' to only ever use black or white. This also makes
+ *   following properties required:
+ * @property {String} [layer] - which layer the text sit on top on - used
+ *   to account for transparency in text color calculation
+ *   layer is inherited from parents. To break inheritance graph use null
+ * @property {String} [variant] - which color slot is background (same as
+ *   above, used to account for transparency)
+ */
+export const SLOT_INHERITANCE = {
+  bg: {
+    depends: [],
+    opacity: 'bg',
+    priority: 1
+  },
+  fg: {
+    depends: [],
+    priority: 1
+  },
+  text: {
+    depends: [],
+    layer: 'bg',
+    opacity: null,
+    priority: 1
+  },
+  underlay: {
+    default: '#000000',
+    opacity: 'underlay'
+  },
+  link: {
+    depends: ['accent'],
+    priority: 1
+  },
+  accent: {
+    depends: ['link'],
+    priority: 1
+  },
+  faint: {
+    depends: ['text'],
+    opacity: 'faint'
+  },
+  faintLink: {
+    depends: ['link'],
+    opacity: 'faint'
+  },
+  postFaintLink: {
+    depends: ['postLink'],
+    opacity: 'faint'
+  },
+
+  cBlue: '#0000ff',
+  cRed: '#FF0000',
+  cGreen: '#00FF00',
+  cOrange: '#E3FF00',
+
+  highlight: {
+    depends: ['bg'],
+    color: (mod, bg) => brightness(5 * mod, bg).rgb
+  },
+  highlightLightText: {
+    depends: ['lightText'],
+    layer: 'highlight',
+    textColor: true
+  },
+  highlightPostLink: {
+    depends: ['postLink'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightFaintText: {
+    depends: ['faint'],
+    layer: 'highlight',
+    textColor: true
+  },
+  highlightFaintLink: {
+    depends: ['faintLink'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightPostFaintLink: {
+    depends: ['postFaintLink'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightText: {
+    depends: ['text'],
+    layer: 'highlight',
+    textColor: true
+  },
+  highlightLink: {
+    depends: ['link'],
+    layer: 'highlight',
+    textColor: 'preserve'
+  },
+  highlightIcon: {
+    depends: ['highlight', 'highlightText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  popover: {
+    depends: ['bg'],
+    opacity: 'popover'
+  },
+  popoverLightText: {
+    depends: ['lightText'],
+    layer: 'popover',
+    textColor: true
+  },
+  popoverPostLink: {
+    depends: ['postLink'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverFaintText: {
+    depends: ['faint'],
+    layer: 'popover',
+    textColor: true
+  },
+  popoverFaintLink: {
+    depends: ['faintLink'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverPostFaintLink: {
+    depends: ['postFaintLink'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverText: {
+    depends: ['text'],
+    layer: 'popover',
+    textColor: true
+  },
+  popoverLink: {
+    depends: ['link'],
+    layer: 'popover',
+    textColor: 'preserve'
+  },
+  popoverIcon: {
+    depends: ['popover', 'popoverText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  selectedPost: '--highlight',
+  selectedPostFaintText: {
+    depends: ['highlightFaintText'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: true
+  },
+  selectedPostLightText: {
+    depends: ['highlightLightText'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: true
+  },
+  selectedPostPostLink: {
+    depends: ['highlightPostLink'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: 'preserve'
+  },
+  selectedPostFaintLink: {
+    depends: ['highlightFaintLink'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: 'preserve'
+  },
+  selectedPostText: {
+    depends: ['highlightText'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: true
+  },
+  selectedPostLink: {
+    depends: ['highlightLink'],
+    layer: 'highlight',
+    variant: 'selectedPost',
+    textColor: 'preserve'
+  },
+  selectedPostIcon: {
+    depends: ['selectedPost', 'selectedPostText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  selectedMenu: {
+    depends: ['bg'],
+    color: (mod, bg) => brightness(5 * mod, bg).rgb
+  },
+  selectedMenuLightText: {
+    depends: ['highlightLightText'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: true
+  },
+  selectedMenuFaintText: {
+    depends: ['highlightFaintText'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: true
+  },
+  selectedMenuFaintLink: {
+    depends: ['highlightFaintLink'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: 'preserve'
+  },
+  selectedMenuText: {
+    depends: ['highlightText'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: true
+  },
+  selectedMenuLink: {
+    depends: ['highlightLink'],
+    layer: 'selectedMenu',
+    variant: 'selectedMenu',
+    textColor: 'preserve'
+  },
+  selectedMenuIcon: {
+    depends: ['selectedMenu', 'selectedMenuText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  selectedMenuPopover: {
+    depends: ['popover'],
+    color: (mod, bg) => brightness(5 * mod, bg).rgb
+  },
+  selectedMenuPopoverLightText: {
+    depends: ['selectedMenuLightText'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: true
+  },
+  selectedMenuPopoverFaintText: {
+    depends: ['selectedMenuFaintText'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: true
+  },
+  selectedMenuPopoverFaintLink: {
+    depends: ['selectedMenuFaintLink'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: 'preserve'
+  },
+  selectedMenuPopoverText: {
+    depends: ['selectedMenuText'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: true
+  },
+  selectedMenuPopoverLink: {
+    depends: ['selectedMenuLink'],
+    layer: 'selectedMenuPopover',
+    variant: 'selectedMenuPopover',
+    textColor: 'preserve'
+  },
+  selectedMenuPopoverIcon: {
+    depends: ['selectedMenuPopover', 'selectedMenuText'],
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  lightText: {
+    depends: ['text'],
+    layer: 'bg',
+    textColor: 'preserve',
+    color: (mod, text) => brightness(20 * mod, text).rgb
+  },
+
+  postLink: {
+    depends: ['link'],
+    layer: 'bg',
+    textColor: 'preserve'
+  },
+
+  border: {
+    depends: ['fg'],
+    opacity: 'border',
+    color: (mod, fg) => brightness(2 * mod, fg).rgb
+  },
+
+  poll: {
+    depends: ['accent', 'bg'],
+    copacity: 'poll',
+    color: (mod, accent, bg) => alphaBlend(accent, 0.4, bg)
+  },
+  pollText: {
+    depends: ['text'],
+    layer: 'poll',
+    textColor: true
+  },
+
+  icon: {
+    depends: ['bg', 'text'],
+    inheritsOpacity: false,
+    color: (mod, bg, text) => mixrgb(bg, text)
+  },
+
+  // Foreground
+  fgText: {
+    depends: ['text'],
+    layer: 'fg',
+    textColor: true
+  },
+  fgLink: {
+    depends: ['link'],
+    layer: 'fg',
+    textColor: 'preserve'
+  },
+
+  // Panel header
+  panel: {
+    depends: ['fg'],
+    opacity: 'panel'
+  },
+  panelText: {
+    depends: ['text'],
+    layer: 'panel',
+    textColor: true
+  },
+  panelFaint: {
+    depends: ['fgText'],
+    layer: 'panel',
+    opacity: 'faint',
+    textColor: true
+  },
+  panelLink: {
+    depends: ['fgLink'],
+    layer: 'panel',
+    textColor: 'preserve'
+  },
+
+  // Top bar
+  topBar: '--fg',
+  topBarText: {
+    depends: ['fgText'],
+    layer: 'topBar',
+    textColor: true
+  },
+  topBarLink: {
+    depends: ['fgLink'],
+    layer: 'topBar',
+    textColor: 'preserve'
+  },
+
+  // Tabs
+  tab: {
+    depends: ['btn']
+  },
+  tabText: {
+    depends: ['btnText'],
+    layer: 'btn',
+    textColor: true
+  },
+  tabActiveText: {
+    depends: ['text'],
+    layer: 'bg',
+    textColor: true
+  },
+
+  // Buttons
+  btn: {
+    depends: ['fg'],
+    variant: 'btn',
+    opacity: 'btn'
+  },
+  btnText: {
+    depends: ['fgText'],
+    layer: 'btn',
+    textColor: true
+  },
+  btnPanelText: {
+    depends: ['btnText'],
+    layer: 'btnPanel',
+    variant: 'btn',
+    textColor: true
+  },
+  btnTopBarText: {
+    depends: ['btnText'],
+    layer: 'btnTopBar',
+    variant: 'btn',
+    textColor: true
+  },
+
+  // Buttons: pressed
+  btnPressed: {
+    depends: ['btn'],
+    layer: 'btn'
+  },
+  btnPressedText: {
+    depends: ['btnText'],
+    layer: 'btn',
+    variant: 'btnPressed',
+    textColor: true
+  },
+  btnPressedPanel: {
+    depends: ['btnPressed'],
+    layer: 'btn'
+  },
+  btnPressedPanelText: {
+    depends: ['btnPanelText'],
+    layer: 'btnPanel',
+    variant: 'btnPressed',
+    textColor: true
+  },
+  btnPressedTopBar: {
+    depends: ['btnPressed'],
+    layer: 'btn'
+  },
+  btnPressedTopBarText: {
+    depends: ['btnTopBarText'],
+    layer: 'btnTopBar',
+    variant: 'btnPressed',
+    textColor: true
+  },
+
+  // Buttons: toggled
+  btnToggled: {
+    depends: ['btn'],
+    layer: 'btn',
+    color: (mod, btn) => brightness(mod * 20, btn).rgb
+  },
+  btnToggledText: {
+    depends: ['btnText'],
+    layer: 'btn',
+    variant: 'btnToggled',
+    textColor: true
+  },
+  btnToggledPanelText: {
+    depends: ['btnPanelText'],
+    layer: 'btnPanel',
+    variant: 'btnToggled',
+    textColor: true
+  },
+  btnToggledTopBarText: {
+    depends: ['btnTopBarText'],
+    layer: 'btnTopBar',
+    variant: 'btnToggled',
+    textColor: true
+  },
+
+  // Buttons: disabled
+  btnDisabled: {
+    depends: ['btn', 'bg'],
+    color: (mod, btn, bg) => alphaBlend(btn, 0.25, bg)
+  },
+  btnDisabledText: {
+    depends: ['btnText', 'btnDisabled'],
+    layer: 'btn',
+    variant: 'btnDisabled',
+    color: (mod, text, btn) => alphaBlend(text, 0.25, btn)
+  },
+  btnDisabledPanelText: {
+    depends: ['btnPanelText', 'btnDisabled'],
+    layer: 'btnPanel',
+    variant: 'btnDisabled',
+    color: (mod, text, btn) => alphaBlend(text, 0.25, btn)
+  },
+  btnDisabledTopBarText: {
+    depends: ['btnTopBarText', 'btnDisabled'],
+    layer: 'btnTopBar',
+    variant: 'btnDisabled',
+    color: (mod, text, btn) => alphaBlend(text, 0.25, btn)
+  },
+
+  // Input fields
+  input: {
+    depends: ['fg'],
+    opacity: 'input'
+  },
+  inputText: {
+    depends: ['text'],
+    layer: 'input',
+    textColor: true
+  },
+  inputPanelText: {
+    depends: ['panelText'],
+    layer: 'inputPanel',
+    variant: 'input',
+    textColor: true
+  },
+  inputTopbarText: {
+    depends: ['topBarText'],
+    layer: 'inputTopBar',
+    variant: 'input',
+    textColor: true
+  },
+
+  alertError: {
+    depends: ['cRed'],
+    opacity: 'alert'
+  },
+  alertErrorText: {
+    depends: ['text'],
+    layer: 'alert',
+    variant: 'alertError',
+    textColor: true
+  },
+  alertErrorPanelText: {
+    depends: ['panelText'],
+    layer: 'alertPanel',
+    variant: 'alertError',
+    textColor: true
+  },
+
+  alertWarning: {
+    depends: ['cOrange'],
+    opacity: 'alert'
+  },
+  alertWarningText: {
+    depends: ['text'],
+    layer: 'alert',
+    variant: 'alertWarning',
+    textColor: true
+  },
+  alertWarningPanelText: {
+    depends: ['panelText'],
+    layer: 'alertPanel',
+    variant: 'alertWarning',
+    textColor: true
+  },
+
+  alertNeutral: {
+    depends: ['text'],
+    opacity: 'alert'
+  },
+  alertNeutralText: {
+    depends: ['text'],
+    layer: 'alert',
+    variant: 'alertNeutral',
+    color: (mod, text) => invertLightness(text).rgb,
+    textColor: true
+  },
+  alertNeutralPanelText: {
+    depends: ['panelText'],
+    layer: 'alertPanel',
+    variant: 'alertNeutral',
+    textColor: true
+  },
+
+  badgeNotification: '--cRed',
+  badgeNotificationText: {
+    depends: ['text', 'badgeNotification'],
+    layer: 'badge',
+    variant: 'badgeNotification',
+    textColor: 'bw'
+  }
+}
diff --git a/src/services/theme_data/theme_data.service.js b/src/services/theme_data/theme_data.service.js
new file mode 100644
index 00000000..75768795
--- /dev/null
+++ b/src/services/theme_data/theme_data.service.js
@@ -0,0 +1,373 @@
+import { convert, brightness, contrastRatio } from 'chromatism'
+import { alphaBlendLayers, getTextColor, relativeLuminance } from '../color_convert/color_convert.js'
+import { LAYERS, DEFAULT_OPACITY, SLOT_INHERITANCE } from './pleromafe.js'
+
+/*
+ * # What's all this?
+ * Here be theme engine for pleromafe. All of this supposed to ease look
+ * and feel customization, making widget styles and make developer's life
+ * easier when it comes to supporting themes. Like many other theme systems
+ * it operates on color definitions, or "slots" - for example you define
+ * "button" color slot and then in UI component Button's CSS you refer to
+ * it as a CSS3 Variable.
+ *
+ * Some applications allow you to customize colors for certain things.
+ * Some UI toolkits allow you to define colors for each type of widget.
+ * Most of them are pretty barebones and have no assistance for common
+ * problems and cases, and in general themes themselves are very hard to
+ * maintain in all aspects. This theme engine tries to solve all of the
+ * common problems with themes.
+ *
+ * You don't have redefine several similar colors if you just want to
+ * change one color - all color slots are derived from other ones, so you
+ * can have at least one or two "basic" colors defined and have all other
+ * components inherit and modify basic ones.
+ *
+ * You don't have to test contrast ratio for colors or pick text color for
+ * each element even if you have light-on-dark elements in dark-on-light
+ * theme.
+ *
+ * You don't have to maintain order of code for inheriting slots from othet
+ * slots - dependency graph resolving does it for you.
+ */
+
+/* This indicates that this version of code outputs similar theme data and
+ * should be incremented if output changes - for instance if getTextColor
+ * function changes and older themes no longer render text colors as
+ * author intended previously.
+ */
+export const CURRENT_VERSION = 3
+
+export const getLayersArray = (layer, data = LAYERS) => {
+  let array = [layer]
+  let parent = data[layer]
+  while (parent) {
+    array.unshift(parent)
+    parent = data[parent]
+  }
+  return array
+}
+
+export const getLayers = (layer, variant = layer, opacitySlot, colors, opacity) => {
+  return getLayersArray(layer).map((currentLayer) => ([
+    currentLayer === layer
+      ? colors[variant]
+      : colors[currentLayer],
+    currentLayer === layer
+      ? opacity[opacitySlot] || 1
+      : opacity[currentLayer]
+  ]))
+}
+
+const getDependencies = (key, inheritance) => {
+  const data = inheritance[key]
+  if (typeof data === 'string' && data.startsWith('--')) {
+    return [data.substring(2)]
+  } else {
+    if (data === null) return []
+    const { depends, layer, variant } = data
+    const layerDeps = layer
+      ? getLayersArray(layer).map(currentLayer => {
+        return currentLayer === layer
+          ? variant || layer
+          : currentLayer
+      })
+      : []
+    if (Array.isArray(depends)) {
+      return [...depends, ...layerDeps]
+    } else {
+      return [...layerDeps]
+    }
+  }
+}
+
+/**
+ * Sorts inheritance object topologically - dependant slots come after
+ * dependencies
+ *
+ * @property {Object} inheritance - object defining the nodes
+ * @property {Function} getDeps - function that returns dependencies for
+ *   given value and inheritance object.
+ * @returns {String[]} keys of inheritance object, sorted in topological
+ *   order. Additionally, dependency-less nodes will always be first in line
+ */
+export const topoSort = (
+  inheritance = SLOT_INHERITANCE,
+  getDeps = getDependencies
+) => {
+  // This is an implementation of https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm
+
+  const allKeys = Object.keys(inheritance)
+  const whites = new Set(allKeys)
+  const grays = new Set()
+  const blacks = new Set()
+  const unprocessed = [...allKeys]
+  const output = []
+
+  const step = (node) => {
+    if (whites.has(node)) {
+      // Make node "gray"
+      whites.delete(node)
+      grays.add(node)
+      // Do step for each node connected to it (one way)
+      getDeps(node, inheritance).forEach(step)
+      // Make node "black"
+      grays.delete(node)
+      blacks.add(node)
+      // Put it into the output list
+      output.push(node)
+    } else if (grays.has(node)) {
+      console.debug('Cyclic depenency in topoSort, ignoring')
+      output.push(node)
+    } else if (blacks.has(node)) {
+      // do nothing
+    } else {
+      throw new Error('Unintended condition in topoSort!')
+    }
+  }
+  while (unprocessed.length > 0) {
+    step(unprocessed.pop())
+  }
+  return output.sort((a, b) => {
+    const depsA = getDeps(a, inheritance).length
+    const depsB = getDeps(b, inheritance).length
+
+    if (depsA === depsB || (depsB !== 0 && depsA !== 0)) return 0
+    if (depsA === 0 && depsB !== 0) return -1
+    if (depsB === 0 && depsA !== 0) return 1
+  })
+}
+
+const expandSlotValue = (value) => {
+  if (typeof value === 'object') return value
+  return {
+    depends: value.startsWith('--') ? [value.substring(2)] : [],
+    default: value.startsWith('#') ? value : undefined
+  }
+}
+/**
+ * retrieves opacity slot for given slot. This goes up the depenency graph
+ * to find which parent has opacity slot defined for it.
+ * TODO refactor this
+ */
+export const getOpacitySlot = (
+  k,
+  inheritance = SLOT_INHERITANCE,
+  getDeps = getDependencies
+) => {
+  const value = expandSlotValue(inheritance[k])
+  if (value.opacity === null) return
+  if (value.opacity) return value.opacity
+  const findInheritedOpacity = (key, visited = [k]) => {
+    const depSlot = getDeps(key, inheritance)[0]
+    if (depSlot === undefined) return
+    const dependency = inheritance[depSlot]
+    if (dependency === undefined) return
+    if (dependency.opacity || dependency === null) {
+      return dependency.opacity
+    } else if (dependency.depends && visited.includes(depSlot)) {
+      return findInheritedOpacity(depSlot, [...visited, depSlot])
+    } else {
+      return null
+    }
+  }
+  if (value.depends) {
+    return findInheritedOpacity(k)
+  }
+}
+
+/**
+ * retrieves layer slot for given slot. This goes up the depenency graph
+ * to find which parent has opacity slot defined for it.
+ * this is basically copypaste of getOpacitySlot except it checks if key is
+ * in LAYERS
+ * TODO refactor this
+ */
+export const getLayerSlot = (
+  k,
+  inheritance = SLOT_INHERITANCE,
+  getDeps = getDependencies
+) => {
+  const value = expandSlotValue(inheritance[k])
+  if (LAYERS[k]) return k
+  if (value.layer === null) return
+  if (value.layer) return value.layer
+  const findInheritedLayer = (key, visited = [k]) => {
+    const depSlot = getDeps(key, inheritance)[0]
+    if (depSlot === undefined) return
+    const dependency = inheritance[depSlot]
+    if (dependency === undefined) return
+    if (dependency.layer || dependency === null) {
+      return dependency.layer
+    } else if (dependency.depends) {
+      return findInheritedLayer(dependency, [...visited, depSlot])
+    } else {
+      return null
+    }
+  }
+  if (value.depends) {
+    return findInheritedLayer(k)
+  }
+}
+
+/**
+ * topologically sorted SLOT_INHERITANCE
+ */
+export const SLOT_ORDERED = topoSort(
+  Object.entries(SLOT_INHERITANCE)
+    .sort(([aK, aV], [bK, bV]) => ((aV && aV.priority) || 0) - ((bV && bV.priority) || 0))
+    .reduce((acc, [k, v]) => ({ ...acc, [k]: v }), {})
+)
+
+/**
+ * All opacity slots used in color slots, their default values and affected
+ * color slots.
+ */
+export const OPACITIES = Object.entries(SLOT_INHERITANCE).reduce((acc, [k, v]) => {
+  const opacity = getOpacitySlot(k, SLOT_INHERITANCE, getDependencies)
+  if (opacity) {
+    return {
+      ...acc,
+      [opacity]: {
+        defaultValue: DEFAULT_OPACITY[opacity] || 1,
+        affectedSlots: [...((acc[opacity] && acc[opacity].affectedSlots) || []), k]
+      }
+    }
+  } else {
+    return acc
+  }
+}, {})
+
+/**
+ * Handle dynamic color
+ */
+export const computeDynamicColor = (sourceColor, getColor, mod) => {
+  if (typeof sourceColor !== 'string' || !sourceColor.startsWith('--')) return sourceColor
+  let targetColor = null
+  // Color references other color
+  const [variable, modifier] = sourceColor.split(/,/g).map(str => str.trim())
+  const variableSlot = variable.substring(2)
+  targetColor = getColor(variableSlot)
+  if (modifier) {
+    targetColor = brightness(Number.parseFloat(modifier) * mod, targetColor).rgb
+  }
+  return targetColor
+}
+
+/**
+ * THE function you want to use. Takes provided colors and opacities
+ * value and uses inheritance data to figure out color needed for the slot.
+ */
+export const getColors = (sourceColors, sourceOpacity) => SLOT_ORDERED.reduce(({ colors, opacity }, key) => {
+  const sourceColor = sourceColors[key]
+  const value = expandSlotValue(SLOT_INHERITANCE[key])
+  const deps = getDependencies(key, SLOT_INHERITANCE)
+  const isTextColor = !!value.textColor
+  const variant = value.variant || value.layer
+
+  let backgroundColor = null
+
+  if (isTextColor) {
+    backgroundColor = alphaBlendLayers(
+      { ...(colors[deps[0]] || convert(sourceColors[key] || '#FF00FF').rgb) },
+      getLayers(
+        getLayerSlot(key) || 'bg',
+        variant || 'bg',
+        getOpacitySlot(variant),
+        colors,
+        opacity
+      )
+    )
+  } else if (variant && variant !== key) {
+    backgroundColor = colors[variant] || convert(sourceColors[variant]).rgb
+  } else {
+    backgroundColor = colors.bg || convert(sourceColors.bg)
+  }
+
+  const isLightOnDark = relativeLuminance(backgroundColor) < 0.5
+  const mod = isLightOnDark ? 1 : -1
+
+  let outputColor = null
+  if (sourceColor) {
+    // Color is defined in source color
+    let targetColor = sourceColor
+    if (targetColor === 'transparent') {
+      // We take only layers below current one
+      const layers = getLayers(
+        getLayerSlot(key),
+        key,
+        getOpacitySlot(key) || key,
+        colors,
+        opacity
+      ).slice(0, -1)
+      targetColor = {
+        ...alphaBlendLayers(
+          convert('#FF00FF').rgb,
+          layers
+        ),
+        a: 0
+      }
+    } else if (typeof sourceColor === 'string' && sourceColor.startsWith('--')) {
+      targetColor = computeDynamicColor(
+        sourceColor,
+        variableSlot => colors[variableSlot] || sourceColors[variableSlot],
+        mod
+      )
+    } else if (typeof sourceColor === 'string' && sourceColor.startsWith('#')) {
+      targetColor = convert(targetColor).rgb
+    }
+    outputColor = { ...targetColor }
+  } else if (value.default) {
+    // same as above except in object form
+    outputColor = convert(value.default).rgb
+  } else {
+    // calculate color
+    const defaultColorFunc = (mod, dep) => ({ ...dep })
+    const colorFunc = value.color || defaultColorFunc
+
+    if (value.textColor) {
+      if (value.textColor === 'bw') {
+        outputColor = contrastRatio(backgroundColor).rgb
+      } else {
+        let color = { ...colors[deps[0]] }
+        if (value.color) {
+          color = colorFunc(mod, ...deps.map((dep) => ({ ...colors[dep] })))
+        }
+        outputColor = getTextColor(
+          backgroundColor,
+          { ...color },
+          value.textColor === 'preserve'
+        )
+      }
+    } else {
+      // background color case
+      outputColor = colorFunc(
+        mod,
+        ...deps.map((dep) => ({ ...colors[dep] }))
+      )
+    }
+  }
+  if (!outputColor) {
+    throw new Error('Couldn\'t generate color for ' + key)
+  }
+  const opacitySlot = getOpacitySlot(key)
+  if (opacitySlot && outputColor.a === undefined) {
+    const dependencySlot = deps[0]
+    if (dependencySlot && colors[dependencySlot] === 'transparent') {
+      outputColor.a = 0
+    } else {
+      outputColor.a = Number(sourceOpacity[opacitySlot]) || OPACITIES[opacitySlot].defaultValue || 1
+    }
+  }
+  if (opacitySlot) {
+    return {
+      colors: { ...colors, [key]: outputColor },
+      opacity: { ...opacity, [opacitySlot]: outputColor.a }
+    }
+  } else {
+    return {
+      colors: { ...colors, [key]: outputColor },
+      opacity
+    }
+  }
+}, { colors: {}, opacity: {} })