import defaultParams from './params.js'
import { toArray, capitalizeFirstLetter, warn } from './utils.js'

const swalStringParams = ['swal-title', 'swal-html', 'swal-footer']

export const getTemplateParams = (params) => {
  const template = typeof params.template === 'string' ? document.querySelector(params.template) : params.template
  if (!template) {
    return {}
  }
  const templateContent = template.content

  showWarningsForElements(templateContent)

  const result = Object.assign(
    getSwalParams(templateContent),
    getSwalButtons(templateContent),
    getSwalImage(templateContent),
    getSwalIcon(templateContent),
    getSwalInput(templateContent),
    getSwalStringParams(templateContent, swalStringParams),
  )
  return result
}

const getSwalParams = (templateContent) => {
  const result = {}
  toArray(templateContent.querySelectorAll('swal-param')).forEach((param) => {
    showWarningsForAttributes(param, ['name', 'value'])
    const paramName = param.getAttribute('name')
    let value = param.getAttribute('value')
    if (typeof defaultParams[paramName] === 'boolean' && value === 'false') {
      value = false
    }
    if (typeof defaultParams[paramName] === 'object') {
      value = JSON.parse(value)
    }
    result[paramName] = value
  })
  return result
}

const getSwalButtons = (templateContent) => {
  const result = {}
  toArray(templateContent.querySelectorAll('swal-button')).forEach((button) => {
    showWarningsForAttributes(button, ['type', 'color', 'aria-label'])
    const type = button.getAttribute('type')
    result[`${type}ButtonText`] = button.innerHTML
    result[`show${capitalizeFirstLetter(type)}Button`] = true
    if (button.hasAttribute('color')) {
      result[`${type}ButtonColor`] = button.getAttribute('color')
    }
    if (button.hasAttribute('aria-label')) {
      result[`${type}ButtonAriaLabel`] = button.getAttribute('aria-label')
    }
  })
  return result
}

const getSwalImage = (templateContent) => {
  const result = {}
  const image = templateContent.querySelector('swal-image')
  if (image) {
    showWarningsForAttributes(image, ['src', 'width', 'height', 'alt'])
    if (image.hasAttribute('src')) {
      result.imageUrl = image.getAttribute('src')
    }
    if (image.hasAttribute('width')) {
      result.imageWidth = image.getAttribute('width')
    }
    if (image.hasAttribute('height')) {
      result.imageHeight = image.getAttribute('height')
    }
    if (image.hasAttribute('alt')) {
      result.imageAlt = image.getAttribute('alt')
    }
  }
  return result
}

const getSwalIcon = (templateContent) => {
  const result = {}
  const icon = templateContent.querySelector('swal-icon')
  if (icon) {
    showWarningsForAttributes(icon, ['type', 'color'])
    if (icon.hasAttribute('type')) {
      result.icon = icon.getAttribute('type')
    }
    if (icon.hasAttribute('color')) {
      result.iconColor = icon.getAttribute('color')
    }
    result.iconHtml = icon.innerHTML
  }
  return result
}

const getSwalInput = (templateContent) => {
  const result = {}
  const input = templateContent.querySelector('swal-input')
  if (input) {
    showWarningsForAttributes(input, ['type', 'label', 'placeholder', 'value'])
    result.input = input.getAttribute('type') || 'text'
    if (input.hasAttribute('label')) {
      result.inputLabel = input.getAttribute('label')
    }
    if (input.hasAttribute('placeholder')) {
      result.inputPlaceholder = input.getAttribute('placeholder')
    }
    if (input.hasAttribute('value')) {
      result.inputValue = input.getAttribute('value')
    }
  }
  const inputOptions = templateContent.querySelectorAll('swal-input-option')
  if (inputOptions.length) {
    result.inputOptions = {}
    toArray(inputOptions).forEach((option) => {
      showWarningsForAttributes(option, ['value'])
      const optionValue = option.getAttribute('value')
      const optionName = option.innerHTML
      result.inputOptions[optionValue] = optionName
    })
  }
  return result
}

const getSwalStringParams = (templateContent, paramNames) => {
  const result = {}
  for (const i in paramNames) {
    const paramName = paramNames[i]
    const tag = templateContent.querySelector(paramName)
    if (tag) {
      showWarningsForAttributes(tag, [])
      result[paramName.replace(/^swal-/, '')] = tag.innerHTML.trim()
    }
  }
  return result
}

const showWarningsForElements = (template) => {
  const allowedElements = swalStringParams.concat([
    'swal-param',
    'swal-button',
    'swal-image',
    'swal-icon',
    'swal-input',
    'swal-input-option',
  ])
  toArray(template.children).forEach((el) => {
    const tagName = el.tagName.toLowerCase()
    if (allowedElements.indexOf(tagName) === -1) {
      warn(`Unrecognized element <${tagName}>`)
    }
  })
}

const showWarningsForAttributes = (el, allowedAttributes) => {
  toArray(el.attributes).forEach((attribute) => {
    if (allowedAttributes.indexOf(attribute.name) === -1) {
      warn([
        `Unrecognized attribute "${attribute.name}" on <${el.tagName.toLowerCase()}>.`,
        `${allowedAttributes.length ? `Allowed attributes are: ${allowedAttributes.join(', ')}` : 'To set the value, use HTML within the element.'}`
      ])
    }
  })
}
