/**
 * @author Toru Nagashima
 * @copyright 2017 Toru Nagashima. All rights reserved.
 * See LICENSE file in root directory for full license.
 */
'use strict'

// ------------------------------------------------------------------------------
// Requirements
// ------------------------------------------------------------------------------

const utils = require('../utils')

// ------------------------------------------------------------------------------
// Rule Definition
// ------------------------------------------------------------------------------

module.exports = {
  meta: {
    type: 'suggestion',
    docs: {
      description: 'enforce `v-bind` directive style',
      category: 'strongly-recommended',
      url: 'https://eslint.vuejs.org/rules/v-bind-style.html'
    },
    fixable: 'code',
    schema: [
      { enum: ['shorthand', 'longform'] }
    ]
  },

  create (context) {
    const preferShorthand = context.options[0] !== 'longform'

    return utils.defineTemplateBodyVisitor(context, {
      "VAttribute[directive=true][key.name.name='bind'][key.argument!=null]" (node) {
        const shorthandProp = node.key.name.rawName === '.'
        const shorthand = node.key.name.rawName === ':' || shorthandProp
        if (shorthand === preferShorthand) {
          return
        }

        context.report({
          node,
          loc: node.loc,
          message:
            preferShorthand ? "Unexpected 'v-bind' before ':'."
              : shorthandProp ? "Expected 'v-bind:' instead of '.'."
              /* otherwise */ : "Expected 'v-bind' before ':'.",
          * fix (fixer) {
            if (preferShorthand) {
              yield fixer.remove(node.key.name)
            } else {
              yield fixer.insertTextBefore(node, 'v-bind')

              if (shorthandProp) {
                // Replace `.` by `:`.
                yield fixer.replaceText(node.key.name, ':')

                // Insert `.prop` modifier if it doesn't exist.
                const modifier = node.key.modifiers[0]
                const isAutoGeneratedPropModifier = modifier.name === 'prop' && modifier.rawName === ''
                if (isAutoGeneratedPropModifier) {
                  yield fixer.insertTextBefore(modifier, '.prop')
                }
              }
            }
          }
        })
      }
    })
  }
}
