export interface ModalSize {
  width: number
  height: number
}

export interface ModalOffset {
  offsetX: number
  offsetY: number
}

export interface ModalRect {
  left: number
  top: number
  width: number
  height: number
}

export interface CreateDefaultModalSizeInput {
  viewportWidth: number
  viewportHeight: number
  margin: number
  minWidth: number
  minHeight: number
}

export interface CreateDefaultModalRectInput extends CreateDefaultModalSizeInput {}

export interface ClampModalSizeInput extends ModalSize {
  minWidth: number
  minHeight: number
  maxWidth: number
  maxHeight: number
}

export interface ClampModalOffsetInput extends ModalSize {
  offsetX: number
  offsetY: number
  viewportWidth: number
  viewportHeight: number
  margin: number
}

export interface ClampModalRectInput extends ModalRect {
  minWidth: number
  minHeight: number
  viewportWidth: number
  viewportHeight: number
  margin: number
}

export function clampModalSize(input: ClampModalSizeInput): ModalSize {
  return {
    width: Math.max(input.minWidth, Math.min(input.width, input.maxWidth)),
    height: Math.max(input.minHeight, Math.min(input.height, input.maxHeight)),
  }
}

export function createDefaultModalSize(input: CreateDefaultModalSizeInput): ModalSize {
  const maxWidth = Math.max(input.minWidth, input.viewportWidth - input.margin * 2)
  const maxHeight = Math.max(input.minHeight, input.viewportHeight - input.margin * 2)
  return clampModalSize({
    width: maxWidth,
    height: maxHeight,
    minWidth: input.minWidth,
    minHeight: input.minHeight,
    maxWidth,
    maxHeight,
  })
}

export function createDefaultModalRect(input: CreateDefaultModalRectInput): ModalRect {
  const size = createDefaultModalSize(input)
  return {
    left: input.margin,
    top: input.margin,
    width: size.width,
    height: size.height,
  }
}

export function clampModalOffset(input: ClampModalOffsetInput): ModalOffset {
  const centerX = (input.viewportWidth - input.width) / 2
  const centerY = (input.viewportHeight - input.height) / 2
  const minOffsetX = input.margin - centerX
  const maxOffsetX = input.viewportWidth - input.margin - (centerX + input.width)
  const minOffsetY = input.margin - centerY
  const maxOffsetY = input.viewportHeight - input.margin - (centerY + input.height)
  return {
    offsetX: Math.max(minOffsetX, Math.min(input.offsetX, maxOffsetX)),
    offsetY: Math.max(minOffsetY, Math.min(input.offsetY, maxOffsetY)),
  }
}

export function clampModalRect(input: ClampModalRectInput): ModalRect {
  const maxWidth = Math.max(input.minWidth, input.viewportWidth - input.margin * 2)
  const maxHeight = Math.max(input.minHeight, input.viewportHeight - input.margin * 2)
  const size = clampModalSize({
    width: input.width,
    height: input.height,
    minWidth: input.minWidth,
    minHeight: input.minHeight,
    maxWidth,
    maxHeight,
  })
  const maxLeft = input.viewportWidth - input.margin - size.width
  const maxTop = input.viewportHeight - input.margin - size.height
  return {
    left: Math.max(input.margin, Math.min(input.left, maxLeft)),
    top: Math.max(input.margin, Math.min(input.top, maxTop)),
    width: size.width,
    height: size.height,
  }
}