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const visit = require('unist-util-visit');

/**
 * Given the MDAST ast, look for all fenced Blockquote
 *
 * @param {object} ast
 * @param {vFile} vFile
 * @return {function}
 */
function visitBlockquote(ast) {
  return visit(ast, 'blockquote', (node, index, parent) => {
    const firstNode = node.children[0];

    if (firstNode.type === 'paragraph') {
      if (firstNode.children[0].type === 'text') {
        if (firstNode.children[0].value.startsWith('!secret')) {
          node.type = 'div';
          firstNode.children[0].value = firstNode.children[0].value.substr(7);
          let sum = '';
          if (firstNode.children[0].value.indexOf('\n') >= 0) {
            sum = firstNode.children[0].value.substr(0,
              firstNode.children[0].value.indexOf('\n'));
            firstNode.children[0].value = firstNode.children[0].value.substr(
              firstNode.children[0].value.indexOf('\n'));
          } else {
            sum = firstNode.children[0].value;
            firstNode.children[0].value = '';
          }

          const secret = {
            type: 'special-box-secret',
            children: [{
              type: 'summary',
              data: {
                hName: 'summary',
                hChildren: [{
                  type: 'text',
                  value: sum ? sum : 'Spoiler'
                }]
              }
            },
              node],
            data: {
              hName: 'details',
              hProperties: {
                className: 'special-box secret'
              }
            }
          };

          parent.children.splice(index, 1, secret);

          return node;
        } else if (firstNode.children[0].value.startsWith('!information') ||
            firstNode.children[0].value.startsWith('!good') ||
            firstNode.children[0].value.startsWith('!bad') ||
            firstNode.children[0].value.startsWith('!comment') ||
            firstNode.children[0].value.startsWith('!attention') ||
            firstNode.children[0].value.startsWith('!question')) {
          node.type = 'div';
          node.data = {
            hName: 'div',
            hProperties: {
              className: 'special-box-content'
            }
          };
          let type = '';
          if (firstNode.children[0].value.indexOf('\n') > 0) {
            type = firstNode.children[0].value.substr(1, firstNode.children[0].value.indexOf('\n'));
            firstNode.children[0].value = firstNode.children[0].value.substr(firstNode.children[0].value.indexOf('\n'));
            console.log(type);
          } else {
            type = firstNode.children[0].value.substr(1);
            firstNode.children[0].value = '';
          }

          const box = {
            type: 'special-box-div',
            children: [node],
            data: {
              hName: 'div',
              hProperties: {
                className: 'special-box ' + type
              }
            }
          };

          parent.children.splice(index, 1, box);

          return node;
        }
      }
    }
    return node;
  });
}

/**
 * Returns the transformer which acst on the MDAST tree and given VFile.
 *
 * @link https://github.com/unifiedjs/unified#function-transformernode-file-next
 * @link https://github.com/syntax-tree/mdast
 * @link https://github.com/vfile/vfile
 * @return {function}
 */
function box() {
  /**
   * @param {object} ast MDAST
   * @param {vFile} vFile
   * @param {function} next
   * @return {object}
   */
  return function (ast, vFile, next) { // Transformer
    visitBlockquote(ast);

    if (typeof next === 'function') {
      return next(null, ast, vFile);
    }

    return ast;
  };
}

module.exports = box;