// Map function
export function map (array, block) {
  var i
  var il = array.length
  var result = []

  for (i = 0; i < il; i++) {
    result.push(block(array[i]))
  }

  return result
}

// Filter function
export function filter (array, block) {
  var i
  var il = array.length
  var result = []

  for (i = 0; i < il; i++) {
    if (block(array[i])) {
      result.push(array[i])
    }
  }

  return result
}

// Degrees to radians
export function radians (d) {
  return d % 360 * Math.PI / 180
}

// Radians to degrees
export function degrees (r) {
  return r * 180 / Math.PI % 360
}

// Convert dash-separated-string to camelCase
export function camelCase (s) {
  return s.toLowerCase().replace(/-(.)/g, function (m, g) {
    return g.toUpperCase()
  })
}

// Convert camel cased string to dash seperated
export function unCamelCase (s) {
  return s.replace(/([A-Z])/g, function (m, g) {
    return '-' + g.toLowerCase()
  })
}

// Capitalize first letter of a string
export function capitalize (s) {
  return s.charAt(0).toUpperCase() + s.slice(1)
}

// Calculate proportional width and height values when necessary
export function proportionalSize (element, width, height, box) {
  if (width == null || height == null) {
    box = box || element.bbox()

    if (width == null) {
      width = box.width / box.height * height
    } else if (height == null) {
      height = box.height / box.width * width
    }
  }

  return {
    width: width,
    height: height
  }
}

/**
 * This function adds support for string origins.
 * It searches for an origin in o.origin o.ox and o.originX.
 * This way, origin: {x: 'center', y: 50} can be passed as well as ox: 'center', oy: 50
**/
export function getOrigin (o, element) {
  const origin = o.origin
  // First check if origin is in ox or originX
  let ox = o.ox != null ? o.ox
    : o.originX != null ? o.originX
    : 'center'
  let oy = o.oy != null ? o.oy
    : o.originY != null ? o.originY
    : 'center'

  // Then check if origin was used and overwrite in that case
  if (origin != null) {
    [ ox, oy ] = Array.isArray(origin) ? origin
      : typeof origin === 'object' ? [ origin.x, origin.y ]
      : [ origin, origin ]
  }

  // Make sure to only call bbox when actually needed
  const condX = typeof ox === 'string'
  const condY = typeof oy === 'string'
  if (condX || condY) {
    const { height, width, x, y } = element.bbox()

    // And only overwrite if string was passed for this specific axis
    if (condX) {
      ox = ox.includes('left') ? x
        : ox.includes('right') ? x + width
        : x + width / 2
    }

    if (condY) {
      oy = oy.includes('top') ? y
        : oy.includes('bottom') ? y + height
        : y + height / 2
    }
  }

  // Return the origin as it is if it wasn't a string
  return [ ox, oy ]
}