import mermaidAPI from '../../mermaidAPI';
import * as configApi from '../../config';
import { log } from '../../logger';

let prevActor = undefined;
let actors = {};
let messages = [];
const notes = [];
let title = '';
let titleWrapped = false;
let sequenceNumbersEnabled = false;
let wrapEnabled = false;

export const parseDirective = function (statement, context, type) {
  mermaidAPI.parseDirective(this, statement, context, type);
};

export const addActor = function (id, name, description, type) {
  // Don't allow description nulling
  const old = actors[id];
  if (old && name === old.name && description == null) return;

  // Don't allow null descriptions, either
  if (description == null || description.text == null) {
    description = { text: name, wrap: null, type };
  }
  if (type == null || description.text == null) {
    description = { text: name, wrap: null, type };
  }

  actors[id] = {
    name: name,
    description: description.text,
    wrap: (description.wrap === undefined && autoWrap()) || !!description.wrap,
    prevActor: prevActor,
    type: type || 'participant'
  };
  if (prevActor && actors[prevActor]) {
    actors[prevActor].nextActor = id;
  }

  prevActor = id;
};

const activationCount = (part) => {
  let i;
  let count = 0;
  for (i = 0; i < messages.length; i++) {
    if (messages[i].type === LINETYPE.ACTIVE_START) {
      if (messages[i].from.actor === part) {
        count++;
      }
    }
    if (messages[i].type === LINETYPE.ACTIVE_END) {
      if (messages[i].from.actor === part) {
        count--;
      }
    }
  }
  return count;
};

export const addMessage = function (idFrom, idTo, message, answer) {
  messages.push({
    from: idFrom,
    to: idTo,
    message: message.text,
    wrap: (message.wrap === undefined && autoWrap()) || !!message.wrap,
    answer: answer,
  });
};

export const addSignal = function (
  idFrom,
  idTo,
  message = { text: undefined, wrap: undefined },
  messageType
) {
  if (messageType === LINETYPE.ACTIVE_END) {
    const cnt = activationCount(idFrom.actor);
    if (cnt < 1) {
      // Bail out as there is an activation signal from an inactive participant
      let error = new Error('Trying to inactivate an inactive participant (' + idFrom.actor + ')');
      error.hash = {
        text: '->>-',
        token: '->>-',
        line: '1',
        loc: { first_line: 1, last_line: 1, first_column: 1, last_column: 1 },
        expected: ["'ACTIVE_PARTICIPANT'"],
      };
      throw error;
    }
  }
  messages.push({
    from: idFrom,
    to: idTo,
    message: message.text,
    wrap: (message.wrap === undefined && autoWrap()) || !!message.wrap,
    type: messageType,
  });
  return true;
};

export const getMessages = function () {
  return messages;
};

export const getActors = function () {
  return actors;
};
export const getActor = function (id) {
  return actors[id];
};
export const getActorKeys = function () {
  return Object.keys(actors);
};
export const getTitle = function () {
  return title;
};
export const getTitleWrapped = function () {
  return titleWrapped;
};
export const enableSequenceNumbers = function () {
  sequenceNumbersEnabled = true;
};
export const showSequenceNumbers = () => sequenceNumbersEnabled;

export const setWrap = function (wrapSetting) {
  wrapEnabled = wrapSetting;
};

export const autoWrap = () => wrapEnabled;

export const clear = function () {
  actors = {};
  messages = [];
};

export const parseMessage = function (str) {
  const _str = str.trim();
  const message = {
    text: _str.replace(/^[:]?(?:no)?wrap:/, '').trim(),
    wrap:
      _str.match(/^[:]?wrap:/) !== null
        ? true
        : _str.match(/^[:]?nowrap:/) !== null
        ? false
        : undefined,
  };
  log.debug('parseMessage:', message);
  return message;
};

export const LINETYPE = {
  SOLID: 0,
  DOTTED: 1,
  NOTE: 2,
  SOLID_CROSS: 3,
  DOTTED_CROSS: 4,
  SOLID_OPEN: 5,
  DOTTED_OPEN: 6,
  LOOP_START: 10,
  LOOP_END: 11,
  ALT_START: 12,
  ALT_ELSE: 13,
  ALT_END: 14,
  OPT_START: 15,
  OPT_END: 16,
  ACTIVE_START: 17,
  ACTIVE_END: 18,
  PAR_START: 19,
  PAR_AND: 20,
  PAR_END: 21,
  RECT_START: 22,
  RECT_END: 23,
  SOLID_POINT: 24,
  DOTTED_POINT: 25,
};

export const ARROWTYPE = {
  FILLED: 0,
  OPEN: 1,
};

export const PLACEMENT = {
  LEFTOF: 0,
  RIGHTOF: 1,
  OVER: 2,
};

export const addNote = function (actor, placement, message) {
  const note = {
    actor: actor,
    placement: placement,
    message: message.text,
    wrap: (message.wrap === undefined && autoWrap()) || !!message.wrap,
  };

  // Coerce actor into a [to, from, ...] array
  const actors = [].concat(actor, actor);

  notes.push(note);
  messages.push({
    from: actors[0],
    to: actors[1],
    message: message.text,
    wrap: (message.wrap === undefined && autoWrap()) || !!message.wrap,
    type: LINETYPE.NOTE,
    placement: placement,
  });
};

export const setTitle = function (titleWrap) {
  title = titleWrap.text;
  titleWrapped = (titleWrap.wrap === undefined && autoWrap()) || !!titleWrap.wrap;
};

export const apply = function (param) {
  if (param instanceof Array) {
    param.forEach(function (item) {
      apply(item);
    });
  } else {
    switch (param.type) {
      case 'addParticipant':
        addActor(param.actor, param.actor, param.description, 'participant');
        break;
      case 'addActor':
        addActor(param.actor, param.actor, param.description, 'actor');
        break;
      case 'activeStart':
        addSignal(param.actor, undefined, undefined, param.signalType);
        break;
      case 'activeEnd':
        addSignal(param.actor, undefined, undefined, param.signalType);
        break;
      case 'addNote':
        addNote(param.actor, param.placement, param.text);
        break;
      case 'addMessage':
        addSignal(param.from, param.to, param.msg, param.signalType);
        break;
      case 'loopStart':
        addSignal(undefined, undefined, param.loopText, param.signalType);
        break;
      case 'loopEnd':
        addSignal(undefined, undefined, undefined, param.signalType);
        break;
      case 'rectStart':
        addSignal(undefined, undefined, param.color, param.signalType);
        break;
      case 'rectEnd':
        addSignal(undefined, undefined, undefined, param.signalType);
        break;
      case 'optStart':
        addSignal(undefined, undefined, param.optText, param.signalType);
        break;
      case 'optEnd':
        addSignal(undefined, undefined, undefined, param.signalType);
        break;
      case 'altStart':
        addSignal(undefined, undefined, param.altText, param.signalType);
        break;
      case 'else':
        addSignal(undefined, undefined, param.altText, param.signalType);
        break;
      case 'altEnd':
        addSignal(undefined, undefined, undefined, param.signalType);
        break;
      case 'setTitle':
        setTitle(param.text);
        break;
      case 'parStart':
        addSignal(undefined, undefined, param.parText, param.signalType);
        break;
      case 'and':
        addSignal(undefined, undefined, param.parText, param.signalType);
        break;
      case 'parEnd':
        addSignal(undefined, undefined, undefined, param.signalType);
        break;
    }
  }
};

export default {
  addActor,
  addMessage,
  addSignal,
  autoWrap,
  setWrap,
  enableSequenceNumbers,
  showSequenceNumbers,
  getMessages,
  getActors,
  getActor,
  getActorKeys,
  getTitle,
  parseDirective,
  getConfig: () => configApi.getConfig().sequence,
  getTitleWrapped,
  clear,
  parseMessage,
  LINETYPE,
  ARROWTYPE,
  PLACEMENT,
  addNote,
  setTitle,
  apply,
};