let flexSpec = require('./flex-spec')
let Declaration = require('../declaration')

class AlignItems extends Declaration {
  /**
   * Change property name for 2009 and 2012 specs
   */
  prefixed (prop, prefix) {
    let spec
    ;[spec, prefix] = flexSpec(prefix)
    if (spec === 2009) {
      return prefix + 'box-align'
    }
    if (spec === 2012) {
      return prefix + 'flex-align'
    }
    return super.prefixed(prop, prefix)
  }

  /**
   * Return property name by final spec
   */
  normalize () {
    return 'align-items'
  }

  /**
   * Change value for 2009 and 2012 specs
   */
  set (decl, prefix) {
    let spec = flexSpec(prefix)[0]
    if (spec === 2009 || spec === 2012) {
      decl.value = AlignItems.oldValues[decl.value] || decl.value
    }
    return super.set(decl, prefix)
  }
}

AlignItems.names = ['align-items', 'flex-align', 'box-align']

AlignItems.oldValues = {
  'flex-end': 'end',
  'flex-start': 'start'
}

module.exports = AlignItems
