// Process -> center text <-

export default function centertext_plugin(md: {
  inline: {
    ruler: {
      before: (arg0: string, arg1: string, arg2: (state: any, silent: any) => boolean) => void;
    };
    ruler2: {
      before: (arg0: string, arg1: string, arg2: (state: { delimiters: any; tokens?: any }) => void) => void;
    };
  };
}) {
  function tokenize(
    state: {
      posMax: any;
      pos: number;
      src: string;
      scanDelims: (arg0: any, arg1: boolean) => void;
      push: (arg0: string, arg1: string, arg2: number) => any;
      delimiters: {
        marker: any;
        jump: number;
        token: number;
        level: any;
        end: number;
        open: boolean;
        close: boolean;
      }[];
      tokens: string | any[];
      level: any;
    },
    silent: any
  ) {
    let token;
    const max = state.posMax;
    const start = state.pos;
    const marker = state.src.charCodeAt(start);
    if (start + 1 > max) {
      return false;
    }
    if (silent) {
      return false;
    } // don't run any pairs in validation mode

    if (marker === 45 /* - */ && state.src.charCodeAt(start + 1) === 62 /* > */) {
      state.scanDelims(state.pos, true);
      token = state.push('text', '', 0);
      token.content = '->';
      state.delimiters.push({
        marker: token.content,
        jump: 0,
        token: state.tokens.length - 1,
        level: state.level,
        end: -1,
        open: true,
        close: false,
      });
    } else if (marker === 60 /* < */ && state.src.charCodeAt(start + 1) === 45 /* - */) {
      // found the close marker
      state.scanDelims(state.pos, true);
      token = state.push('text', '', 0);
      token.content = '<-';
      state.delimiters.push({
        marker: token.content,
        jump: 0,
        token: state.tokens.length - 1,
        level: state.level,
        end: -1,
        open: false,
        close: true,
      });
    } else {
      // neither
      return false;
    }

    state.pos += 2; // eslint-disable-line no-param-reassign

    return true;
  }

  // Walk through delimiter list and replace text tokens with tags
  //
  function postProcess(state: { delimiters: any; tokens?: any }) {
    let i;
    let foundStart = false;
    let foundEnd = false;
    let delim;
    let token;
    const { delimiters } = state;
    const max = state.delimiters.length;

    for (i = 0; i < max; i += 1) {
      delim = delimiters[i];
      if (delim.marker === '->') {
        foundStart = true;
      } else if (delim.marker === '<-') {
        foundEnd = true;
      }
    }
    if (foundStart && foundEnd) {
      for (i = 0; i < max; i += 1) {
        delim = delimiters[i];

        if (delim.marker === '->') {
          foundStart = true;
          token = state.tokens[delim.token];
          token.type = 'centertext_open';
          token.tag = 'center';
          token.nesting = 1;
          token.markup = '->';
          token.content = '';
          // token.attrs = [['class', 'text-center']];
        } else if (delim.marker === '<-') {
          if (foundStart) {
            token = state.tokens[delim.token];
            token.type = 'centertext_close';
            token.tag = 'center';
            token.nesting = -1;
            token.markup = '<-';
            token.content = '';
          }
        }
      }
    }
  }

  md.inline.ruler.before('emphasis', 'centertext', tokenize);
  md.inline.ruler2.before('emphasis', 'centertext', postProcess);
}