/**
 * ---
 * title: mermaidAPI
 * order: 5
 * ---
 * # mermaidAPI
 * This is the api to be used when handling the integration with the web page instead of using the default integration
 * (mermaid.js).
 *
 * The core of this api is the **render** function that given a graph definitionas text renders the graph/diagram and
 * returns a svg element for the graph. It is is then up to the user of the API to make use of the svg, either insert it
 * somewhere in the page or something completely different.
*/
import EventEmitter from 'events'

var Logger = require('./logger')
var log = Logger.Log

var graph = require('./diagrams/flowchart/graphDb')
var utils = require('./utils')
var flowRenderer = require('./diagrams/flowchart/flowRenderer')
var seq = require('./diagrams/sequenceDiagram/sequenceRenderer')
var info = require('./diagrams/example/exampleRenderer')
var infoParser = require('./diagrams/example/parser/example')
var flowParser = require('./diagrams/flowchart/parser/flow')
var dotParser = require('./diagrams/flowchart/parser/dot')
var sequenceParser = require('./diagrams/sequenceDiagram/parser/sequenceDiagram')
var sequenceDb = require('./diagrams/sequenceDiagram/sequenceDb')
var infoDb = require('./diagrams/example/exampleDb')
var gantt = require('./diagrams/gantt/ganttRenderer')
var ganttParser = require('./diagrams/gantt/parser/gantt')
var ganttDb = require('./diagrams/gantt/ganttDb')
var classParser = require('./diagrams/classDiagram/parser/classDiagram')
var classRenderer = require('./diagrams/classDiagram/classRenderer')
var classDb = require('./diagrams/classDiagram/classDb')
var gitGraphParser = require('./diagrams/gitGraph/parser/gitGraph')
var gitGraphRenderer = require('./diagrams/gitGraph/gitGraphRenderer')
var gitGraphAst = require('./diagrams/gitGraph/gitGraphAst')
var d3 = require('./d3')

module.exports.eventEmitter = new EventEmitter()

/**
 * ## Configuration
 * These are the default options which can be overridden with the initialization call as in the example below:
 * ```
 * mermaid.initialize({
 *   flowchart:{
 *      htmlLabels: false
 *   }
 * });
 * ```
 */
var config = {
  /**
   * logLevel , decides the amount of logging to be used.
   *    * debug: 1
   *    * info: 2
   *    * warn: 3
   *    * error: 4
   *    * fatal: 5
   */
  logLevel: 5,
  /**
   * **cloneCssStyles** - This options controls whether or not the css rules should be copied into the generated svg
   */
  cloneCssStyles: true,

  /**
   * **startOnLoad** - This options controls whether or mermaid starts when the page loads
   */
  startOnLoad: true,

  /**
   * **arrowMarkerAbsolute** - This options controls whether or arrow markers in html code will be absolute paths or
   * an anchor, #. This matters if you are using base tag settings.
   */
  arrowMarkerAbsolute: false,

  /**
   * ### flowchart
   * *The object containing configurations specific for flowcharts*
   */
  flowchart: {
    /**
     * **htmlLabels** - Flag for setting whether or not a html tag should be used for rendering labels
     * on the edges
     */
    htmlLabels: true,
    /**
     * **useMaxWidth** - Flag for setting whether or not a all available width should be used for
     * the diagram.
     */
    useMaxWidth: true
  },

  /**
   * ###  sequenceDiagram
   * The object containing configurations specific for sequence diagrams
   */
  sequenceDiagram: {

    /**
     * **diagramMarginX** - margin to the right and left of the sequence diagram
     */
    diagramMarginX: 50,

    /**
     * **diagramMarginY** - margin to the over and under the sequence diagram
     */
    diagramMarginY: 10,

    /**
     * **actorMargin** - Margin between actors
     */
    actorMargin: 50,

    /**
     * **width** - Width of actor boxes
     */
    width: 150,

    /**
     * **height** - Height of actor boxes
     */
    height: 65,

    /**
     * **boxMargin** - Margin around loop boxes
     */
    boxMargin: 10,

    /**
     * **boxTextMargin** - margin around the text in loop/alt/opt boxes
     */
    boxTextMargin: 5,

    /**
     * **noteMargin** - margin around notes
     */
    noteMargin: 10,

    /**
     * **messageMargin** - Space between messages
     */
    messageMargin: 35,

    /**
     * **mirrorActors** - mirror actors under diagram
     */
    mirrorActors: true,

    /**
     * **bottomMarginAdj** - Depending on css styling this might need adjustment.
     * Prolongs the edge of the diagram downwards
     */
    bottomMarginAdj: 1,

    /**
     * **useMaxWidth** - when this flag is set the height and width is set to 100% and is then scaling with the
     * available space if not the absolute space required is used
     */
    useMaxWidth: true
  },

  /** ### gantt
   * The object containing configurations specific for gantt diagrams*
   */
  gantt: {
    /**
     * **titleTopMargin** - margin top for the text over the gantt diagram
     */
    titleTopMargin: 25,

    /**
     * **barHeight** - the height of the bars in the graph
     */
    barHeight: 20,

    /**
     * **barGap** - the margin between the different activities in the gantt diagram
     */
    barGap: 4,

    /**
     *  **topPadding** - margin between title and gantt diagram and between axis and gantt diagram.
     */
    topPadding: 50,

    /**
     *  **leftPadding** - the space allocated for the section name to the left of the activities.
     */
    leftPadding: 75,

    /**
     *  **gridLineStartPadding** - Vertical starting position of the grid lines
     */
    gridLineStartPadding: 35,

    /**
     *  **fontSize** - font size ...
     */
    fontSize: 11,

    /**
     * **fontFamily** - font family ...
     */
    fontFamily: '"Open-Sans", "sans-serif"',

    /**
     * **numberSectionStyles** - the number of alternating section styles
     */
    numberSectionStyles: 3,

    /**
     * **axisFormatter** - formatting of the axis, this might need adjustment to match your locale and preferences
     */
    axisFormatter: [

      // Within a day
      ['%I:%M', function (d) {
        return d.getHours()
      }],
      // Monday a week
      ['w. %U', function (d) {
        return d.getDay() === 1
      }],
      // Day within a week (not monday)
      ['%a %d', function (d) {
        return d.getDay() && d.getDate() !== 1
      }],
      // within a month
      ['%b %d', function (d) {
        return d.getDate() !== 1
      }],
      // Month
      ['%m-%y', function (d) {
        return d.getMonth()
      }]
    ]
  },
  classDiagram: {},
  gitGraph: {},
  info: {}
}

Logger.setLogLevel(config.logLevel)

/**
 * ## parse
 * Function that parses a mermaid diagram definition. If parsing fails the parseError callback is called and an error is
 * thrown and
 * @param text
 */
var parse = function (text) {
  var graphType = utils.detectType(text)
  var parser

  switch (graphType) {
    case 'gitGraph':
      parser = gitGraphParser
      parser.parser.yy = gitGraphAst
      break
    case 'graph':
      parser = flowParser
      parser.parser.yy = graph
      break
    case 'dotGraph':
      parser = dotParser
      parser.parser.yy = graph
      break
    case 'sequenceDiagram':
      parser = sequenceParser
      parser.parser.yy = sequenceDb
      break
    case 'info':
      parser = infoParser
      parser.parser.yy = infoDb
      break
    case 'gantt':
      parser = ganttParser
      parser.parser.yy = ganttDb
      break
    case 'classDiagram':
      parser = classParser
      parser.parser.yy = classDb
      break
  }

  parser.parser.yy.parseError = (err, hash) => {
    module.exports.eventEmitter.emit('parseError', err, hash)
  }

  try {
    parser.parse(text)
    return true
  } catch (err) {
    return false
  }
}
module.exports.parse = parse

/**
 * ## version
 * Function returning version information
 * @returns {string} A string containing the version info
 */
module.exports.version = function () {
  return require('../package.json').version
}

module.exports.encodeEntities = function (text) {
  var txt = text

  txt = txt.replace(/style.*:\S*#.*;/g, function (s) {
    var innerTxt = s.substring(0, s.length - 1)
    return innerTxt
  })
  txt = txt.replace(/classDef.*:\S*#.*;/g, function (s) {
    var innerTxt = s.substring(0, s.length - 1)
    return innerTxt
  })

  txt = txt.replace(/#\w+;/g, function (s) {
    var innerTxt = s.substring(1, s.length - 1)

    var isInt = /^\+?\d+$/.test(innerTxt)
    if (isInt) {
      return 'fl°°' + innerTxt + '¶ß'
    } else {
      return 'fl°' + innerTxt + '¶ß'
    }
  })

  return txt
}

module.exports.decodeEntities = function (text) {
  var txt = text

  txt = txt.replace(/fl°°/g, function () {
    return '&#'
  })
  txt = txt.replace(/fl°/g, function () {
    return '&'
  })
  txt = txt.replace(/¶ß/g, function () {
    return ';'
  })

  return txt
}
/**
 * ##render
 * Function that renders an svg with a graph from a chart definition. Usage example below.
 *
 * ```
 * mermaidAPI.initialize({
 *      startOnLoad:true
 *  });
 *  $(function(){
 *      var graphDefinition = 'graph TB\na-->b';
 *      var cb = function(svgGraph){
 *          console.log(svgGraph);
 *      };
 *      mermaidAPI.render('id1',graphDefinition,cb);
 *  });
 *```
 * @param id the id of the element to be rendered
 * @param txt the graph definition
 * @param cb callback which is called after rendering is finished with the svg code as inparam.
 * @param container selector to element in which a div with the graph temporarily will be inserted. In one is
 * provided a hidden div will be inserted in the body of the page instead. The element will be removed when rendering is
 * completed.
 */
var render = function (id, txt, cb, container) {
  if (typeof container !== 'undefined') {
    container.innerHTML = ''

    d3.select(container).append('div')
      .attr('id', 'd' + id)
      .append('svg')
      .attr('id', id)
      .attr('width', '100%')
      .attr('xmlns', 'http://www.w3.org/2000/svg')
      .append('g')
  } else {
    const element = document.querySelector('#' + 'd' + id)
    if (element) {
      element.innerHTML = ''
    }

    d3.select('body').append('div')
      .attr('id', 'd' + id)
      .append('svg')
      .attr('id', id)
      .attr('width', '100%')
      .attr('xmlns', 'http://www.w3.org/2000/svg')
      .append('g')
  }

  window.txt = txt
  txt = module.exports.encodeEntities(txt)

  var element = d3.select('#d' + id).node()
  var graphType = utils.detectType(txt)
  var classes = {}
  switch (graphType) {
    case 'gitGraph':
      config.flowchart.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      gitGraphRenderer.setConf(config.gitGraph)
      gitGraphRenderer.draw(txt, id, false)
      break
    case 'graph':
      config.flowchart.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      flowRenderer.setConf(config.flowchart)
      flowRenderer.draw(txt, id, false)
      if (config.cloneCssStyles) {
        classes = flowRenderer.getClasses(txt, false)
        utils.cloneCssStyles(element.firstChild, classes)
      }
      break
    case 'dotGraph':
      config.flowchart.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      flowRenderer.setConf(config.flowchart)
      flowRenderer.draw(txt, id, true)
      if (config.cloneCssStyles) {
        classes = flowRenderer.getClasses(txt, true)
        utils.cloneCssStyles(element.firstChild, classes)
      }
      break
    case 'sequenceDiagram':
      config.sequenceDiagram.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      seq.setConf(config.sequenceDiagram)
      seq.draw(txt, id)
      if (config.cloneCssStyles) {
        utils.cloneCssStyles(element.firstChild, [])
      }
      break
    case 'gantt':
      config.gantt.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      gantt.setConf(config.gantt)
      gantt.draw(txt, id)
      if (config.cloneCssStyles) {
        utils.cloneCssStyles(element.firstChild, [])
      }
      break
    case 'classDiagram':
      config.classDiagram.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      classRenderer.setConf(config.classDiagram)
      classRenderer.draw(txt, id)
      if (config.cloneCssStyles) {
        utils.cloneCssStyles(element.firstChild, [])
      }
      break
    case 'info':
      config.info.arrowMarkerAbsolute = config.arrowMarkerAbsolute
      info.draw(txt, id, module.exports.version())
      if (config.cloneCssStyles) {
        utils.cloneCssStyles(element.firstChild, [])
      }
      break
  }

  d3.select('#d' + id).selectAll('foreignobject div').attr('xmlns', 'http://www.w3.org/1999/xhtml')

  var url = ''
  if (config.arrowMarkerAbsolute) {
    url = window.location.protocol + '//' + window.location.host + window.location.pathname + window.location.search
    url = url.replace(/\(/g, '\\(')
    url = url.replace(/\)/g, '\\)')
  }

  // Fix for when the base tag is used
  var svgCode = d3.select('#d' + id).node().innerHTML.replace(/url\(#arrowhead/g, 'url(' + url + '#arrowhead', 'g')

  svgCode = module.exports.decodeEntities(svgCode)

  if (typeof cb !== 'undefined') {
    cb(svgCode, graph.bindFunctions)
  } else {
    log.warn('CB = undefined!')
  }

  var node = d3.select('#d' + id).node()
  if (node !== null && typeof node.remove === 'function') {
    d3.select('#d' + id).node().remove()
  }

  return svgCode
}

module.exports.render = function (id, text, cb, containerElement) {
  try {
    if (arguments.length === 1) {
      text = id
      id = 'mermaidId0'
    }

    if (typeof document === 'undefined') {
      // Todo handle rendering serverside using phantomjs
    } else {
      // In browser
      return render(id, text, cb, containerElement)
    }
  } catch (e) {
    log.warn(e)
  }
}

var setConf = function (cnf) {
  // Top level initially mermaid, gflow, sequenceDiagram and gantt
  var lvl1Keys = Object.keys(cnf)
  var i
  for (i = 0; i < lvl1Keys.length; i++) {
    if (typeof cnf[lvl1Keys[i]] === 'object') {
      var lvl2Keys = Object.keys(cnf[lvl1Keys[i]])

      var j
      for (j = 0; j < lvl2Keys.length; j++) {
        log.debug('Setting conf ', lvl1Keys[i], '-', lvl2Keys[j])
        if (typeof config[lvl1Keys[i]] === 'undefined') {
          config[lvl1Keys[i]] = {}
        }
        log.debug('Setting config: ' + lvl1Keys[i] + ' ' + lvl2Keys[j] + ' to ' + cnf[lvl1Keys[i]][lvl2Keys[j]])
        config[lvl1Keys[i]][lvl2Keys[j]] = cnf[lvl1Keys[i]][lvl2Keys[j]]
      }
    } else {
      config[lvl1Keys[i]] = cnf[lvl1Keys[i]]
    }
  }
}

module.exports.initialize = function (options) {
  log.debug('Initializing mermaidAPI')
  // Update default config with options supplied at initialization
  if (typeof options === 'object') {
    setConf(options)
  }
  Logger.setLogLevel(config.logLevel)
}
module.exports.getConfig = function () {
  return config
}

module.exports.parseError = function (err, hash) {
  if (typeof mermaid !== 'undefined') {
    global.mermaid.parseError(err, hash)
  } else {
    log.debug('Mermaid Syntax error:')
    log.debug(err)
  }
}

global.mermaidAPI = {
  render: module.exports.render,
  parse: module.exports.parse,
  initialize: module.exports.initialize,
  detectType: utils.detectType,
  parseError: module.exports.parseError,
  getConfig: module.exports.getConfig,
  eventEmitter: module.exports.eventEmitter
}