# All files / src/_utils getAnchorPosition.ts

90.27% Statements 65/72
71.42% Branches 20/28
80% Functions 24/30
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     import { defaultRect, Rect } from './dom'
    import { Placement } from './types'

    interface Components {
      align: Placement
      edge: Placement
    }

    type Validator = (container: Rect, target: Rect, overlay: Rect) => boolean
    type Updater = (target: Rect, overlay: Rect) => object
    type ValidatorMap = { [s: string]: Validator }
    type UpdaterMap = { [s: string]: Updater }
    type PlacementMap = { [s: string]: Placement }

    interface ComponentUpdater {
      validator: ValidatorMap
      updater: UpdaterMap
    }

    interface Config {
      container: Rect
      target: Rect
      overlay: Rect
      canFlip?: boolean
      placement: Placement
    }

    const optionHeight = 36

    // UTILS

    function getComponents(placement: Placement): Components {
      const [primary, secondary] = placement.split('-')
      const edge = primary as Placement
      const align = (secondary as Placement) || 'center'
      return { edge, align }
    }

    function fromComponents({ align, edge }: Components): Placement {
      return align === 'center' ? edge : (`${edge}-${align}` as Placement)
    }

    function getContainer(): Rect {
      return {
        top: 0,
        left: 0,
        width: window.innerWidth,
        height: window.innerHeight,
        bottom: window.innerWidth,
        right: window.innerWidth,
      }
    }

    function flip(current: Placement) {
      const opposite: PlacementMap = {
        top: 'bottom',
        bottom: 'top',
        left: 'right',
        right: 'left',
        center: 'center',
      }

      return opposite[current]
    }

    // GENERIC POSITION UPDATER (Edge, Align)
    // Flip updater if validator fails and opposite passes
    function getPositionComponent({ validator, updater }: ComponentUpdater) {
      return ({
        container,
        target,
        overlay,
        placement: current,
        canFlip = true,
      }: Config) => {
        const opposite = flip(current)

        const shouldFlip =
          !validator[current](container, target, overlay) &&
          validator[opposite](container, target, overlay)

        const placement = canFlip && shouldFlip ? opposite : current

        return {
          placement,
          ...updater[placement](target, overlay),
        }
      }
    }

    // PRIMARY
    const Edge: ComponentUpdater = {
      updater: {
        left: (target, overlay) => ({
          left: target.left - overlay.width,
        }),
        right: (target, overlay) => ({ left: target.right }),
        top: (target, overlay) => ({
          top: target.top - overlay.height,
        }),
        bottom: (target, overlay) => ({
          top: target.bottom,
        }),
      },
      validator: {
        top: (container, target, overlay) =>
          target.top - container.top >= overlay.height,
        left: (container, target, overlay) =>
          target.left - container.left >= overlay.width,
        bottom: (container, target, overlay) =>
          container.height - target.bottom >= overlay.height,
        right: (container, target, overlay) =>
          container.width - target.right >= overlay.width,
      },
    }

    // SECONDARY
    export const Alignment: ComponentUpdater = {
      updater: {
        left: (target, overlay) => ({ left: target.left }),
        right: (target, overlay) => ({ left: target.right - overlay.width }),
        top: (target, overlay) => ({ top: target.top }),
        bottom: (target, overlay) => ({ top: target.bottom - overlay.height }),
        center: (target, overlay) => ({
          left: target.left + (target.width - overlay.width) / 2,
          top: target.top + (target.height - overlay.height) / 2,
        }),
      },
      validator: {
        top: (container, target, overlay) =>
          container.height - target.top >= overlay.height,
        right: (container, target, overlay) =>
          target.right - container.left >= overlay.width,
        left: (container, target, overlay) =>
          container.width - target.left >= overlay.width,
        bottom: (container, target, overlay) =>
          target.bottom - container.top >= overlay.height,
        center: () => true,
      },
    }

    export const getAlignmentPosition = getPositionComponent(Alignment)
    export const getEdgePosition = getPositionComponent(Edge)
    export const getFlyoutAlignmentPosition = getPositionComponent({
      updater: {
        ...Alignment.updater,
        left: (target, overlay) => ({ left: target.right }),
        right: (target, overlay) => ({ left: target.left - overlay.width }),
        center: (target, overlay) => ({
          left: target.right,
          top: target.top + (target.height - overlay.height) / 2,
        }),
      },
      validator: Alignment.validator,
    })

    export const getFlyoutEdgePosition = getPositionComponent({
      updater: {
        ...Edge.updater,
        bottom: (target, overlay) => ({ top: target.bottom - optionHeight }), // Aligns to height of menu option
      },
      validator: Edge.validator,
    })

    export const padding = (Ipad: number = 0, shape: Rect) => ({
      ...shape,
      width: shape.width + pad * 2,
      height: shape.height + pad * 2,
      top: shape.top - pad,
      bottom: shape.bottom + pad,
      left: shape.left - pad,
      right: shape.right + pad,
    })

    export function getAnchorPosition(
      placement: Placement,
      Ipad: number = 0,
      container: Rect = getContainer(),
      target: Rect,
      overlay: Rect,
      canFlip: boolean = true,
      isFlyout: boolean
    ): any {
      Iif (!target || !overlay) {
        return defaultRect
      }

      let components = getComponents(placement)
      const defaultConfig = {
        canFlip,
        container,
        target,
        overlay,
        placement,
      }

      const isFlyoutDefaultButton =
        target.width === 24 || target.width === 36 || target.width === 48
      const isFlyoutAdjustment = isFlyout && !isFlyoutDefaultButton

      const align = isFlyoutAdjustment
        ? getFlyoutAlignmentPosition({
            ...defaultConfig,
            placement: components.align,
          })
        : getAlignmentPosition({
            ...defaultConfig,
            placement: components.align,
          })

      const edge = isFlyoutAdjustment
        ? getFlyoutEdgePosition({
            ...defaultConfig,
            target: padding(pad, target),
            placement: components.edge,
          })
        : getEdgePosition({
            ...defaultConfig,
            target: padding(pad, target),
            placement: components.edge,
          })

      return {
        ...align,
        ...edge,
        placement: fromComponents({ align: align.placement, edge: edge.placement }),
        minWidth: target.width,
      }
    }