const AST = require('./ast')
const OsloError = require('./osloError')

function element(name, args) {
  return new AST.HTMLElement({
    name: name,
    attributes: args.filter(arg => arg.constructor === AST.Attribute),
    contents: args.filter(arg => arg.constructor !== AST.Attribute),
  })
}

const core = {
  '+': (a, b) => new AST.Number({ value: a.value + b.value }),
  '-': (a, b) => new AST.Number({ value: a.value - b.value }),
  '*': (a, b) => new AST.Number({ value: a.value * b.value }),
  '/': (a, b) => new AST.Number({ value: a.value / b.value }),
  '=': (a, b) => new AST.Boolean({ value: a.value === b.value }),
  '>': (a, b) => new AST.Boolean({ value: a.value > b.value }),
  '<': (a, b) => new AST.Boolean({ value: a.value < b.value }),
  '>=': (a, b) => new AST.Boolean({ value: a.value >= b.value }),
  '<=': (a, b) => new AST.Boolean({ value: a.value <= b.value }),
  list: (...args) => new AST.List({ elements: args }),
  length: xs => new AST.Number({ value: xs.elements.length }),
  cons: (x, xs) => new AST.List({ elements: [x, ...xs.elements] }),
  first: xs => xs.elements[0],
  rest: xs => new AST.List({ elements: xs.elements.slice(1) }),
}

const tags = [
  '!DOCTYPE',
  '!doctype',
  'a',
  'abbr',
  'acronym',
  'address',
  'applet',
  'area',
  'article',
  'aside',
  'audio',
  'b',
  'base',
  'basefont',
  'bdi',
  'bdo',
  'bgsound',
  'big',
  'blink',
  'blockquote',
  'body',
  'br',
  'button',
  'canvas',
  'caption',
  'center',
  'cite',
  'code',
  'col',
  'colgroup',
  'command',
  'content',
  'data',
  'datalist',
  'dd',
  'del',
  'details',
  'dfn',
  'dialog',
  'dir',
  'div',
  'dl',
  'dt',
  'element',
  'em',
  'embed',
  'fieldset',
  'figcaption',
  'figure',
  'font',
  'footer',
  'form',
  'frame',
  'frameset',
  'h1',
  'head',
  'header',
  'hgroup',
  'hr',
  'html',
  'i',
  'iframe',
  'image',
  'img',
  'input',
  'ins',
  'isindex',
  'kbd',
  'keygen',
  'label',
  'legend',
  'li',
  'link',
  'listing',
  'main',
  'map',
  'mark',
  'marquee',
  'menu',
  'menuitem',
  'meta',
  'meter',
  'multicol',
  'nav',
  'nextid',
  'nobr',
  'noembed',
  'noframes',
  'noscript',
  'object',
  'ol',
  'optgroup',
  'option',
  'output',
  'p',
  'param',
  'picture',
  'plaintext',
  'pre',
  'progress',
  'q',
  'rb',
  'rp',
  'rt',
  'rtc',
  'ruby',
  's',
  'samp',
  'script',
  'section',
  'select',
  'shadow',
  'slot',
  'small',
  'source',
  'spacer',
  'span',
  'strike',
  'strong',
  'style',
  'sub',
  'summary',
  'sup',
  'table',
  'tbody',
  'td',
  'template',
  'textarea',
  'tfoot',
  'th',
  'thead',
  'time',
  'title',
  'tr',
  'track',
  'tt',
  'u',
  'ul',
  'var',
  'video',
  'wbr',
  'xm'
]

tags.forEach(tagName => {
  core[tagName] = (...args) => element(tagName, args)
})

module.exports = core