/**
Generic template helper definitions for HackMyResume / FluentCV.
@license MIT. See LICENSE.md for details.
@module helpers/generic-helpers
 */

(function() {
  var FS, FluentDate, GenericHelpers, H2W, HMSTATUS, LO, MD, PATH, XML, _, _fromTo, _reportError, moment, printf, skillLevelToIndex, unused;

  MD = require('marked');

  H2W = require('../utils/html-to-wpml');

  XML = require('xml-escape');

  FluentDate = require('../core/fluent-date');

  HMSTATUS = require('../core/status-codes');

  moment = require('moment');

  FS = require('fs');

  LO = require('lodash');

  PATH = require('path');

  printf = require('printf');

  _ = require('underscore');

  unused = require('../utils/string');


  /** Generic template helper function definitions. */

  GenericHelpers = module.exports = {

    /**
    Convert the input date to a specified format through Moment.js.
    If date is invalid, will return the time provided by the user,
    or default to the fallback param or 'Present' if that is set to true
    @method formatDate
     */
    formatDate: function(datetime, format, fallback) {
      var momentDate, ref, ref1;
      if (moment) {
        momentDate = moment(datetime);
        if (momentDate.isValid()) {
          return momentDate.format(format);
        }
      }
      return datetime || ((ref = typeof fallback === 'string') != null ? ref : {
        fallback: (ref1 = fallback === true) != null ? ref1 : {
          'Present': null
        }
      });
    },

    /**
    Given a resume sub-object with a start/end date, format a representation of
    the date range.
    @method dateRange
     */
    dateRange: function(obj, fmt, sep, fallback, options) {
      if (!obj) {
        return '';
      }
      return _fromTo(obj.start, obj.end, fmt, sep, fallback, options);
    },

    /**
    Format a from/to date range for display.
    @method toFrom
     */
    fromTo: function() {
      return _fromTo.apply(this, arguments);
    },

    /**
    Return a named color value as an RRGGBB string.
    @method toFrom
     */
    color: function(colorName, colorDefault) {
      var ret;
      if (!(colorName && colorName.trim())) {
        return _reportError(HMSTATUS.invalidHelperUse, {
          helper: 'fontList',
          error: HMSTATUS.missingParam,
          expected: 'name'
        });
      } else {
        if (!GenericHelpers.theme.colors) {
          return colorDefault;
        }
        ret = GenericHelpers.theme.colors[colorName];
        if (!(ret && ret.trim())) {
          return colorDefault;
        }
        return ret;
      }
    },

    /**
    Return true if the section is present on the resume and has at least one
    element.
    @method section
     */
    section: function(title, options) {
      var obj, ret;
      title = title.trim().toLowerCase();
      obj = LO.get(this.r, title);
      ret = '';
      if (obj) {
        if (_.isArray(obj)) {
          if (obj.length) {
            ret = options.fn(this);
          }
        } else if (_.isObject(obj)) {
          if ((obj.history && obj.history.length) || (obj.sets && obj.sets.length)) {
            ret = options.fn(this);
          }
        }
      }
      return ret;
    },

    /**
    Emit the size of the specified named font.
    @param key {String} A named style from the "fonts" section of the theme's
    theme.json file. For example: 'default' or 'heading1'.
     */
    fontSize: function(key, defSize, units) {
      var fontSpec, hasDef, ret;
      ret = '';
      hasDef = defSize && (String.is(defSize) || _.isNumber(defSize));
      if (!(key && key.trim())) {
        _reportError(HMSTATUS.invalidHelperUse, {
          helper: 'fontSize',
          error: HMSTATUS.missingParam,
          expected: 'key'
        });
        return ret;
      } else if (GenericHelpers.theme.fonts) {
        fontSpec = LO.get(GenericHelpers.theme.fonts, this.format + '.' + key);
        if (!fontSpec) {
          if (GenericHelpers.theme.fonts.all) {
            fontSpec = GenericHelpers.theme.fonts.all[key];
          }
        }
        if (fontSpec) {
          if (String.is(fontSpec)) {

          } else if (_.isArray(fontSpec)) {
            if (!String.is(fontSpec[0])) {
              ret = fontSpec[0].size;
            }
          } else {
            ret = fontSpec.size;
          }
        }
      }
      if (!ret) {
        if (hasDef) {
          ret = defSize;
        } else {
          _reportError(HMSTATUS.invalidHelperUse, {
            helper: 'fontSize',
            error: HMSTATUS.missingParam,
            expected: 'defSize'
          });
          ret = '';
        }
      }
      return ret;
    },

    /**
    Emit the font face (such as 'Helvetica' or 'Calibri') associated with the
    provided key.
    @param key {String} A named style from the "fonts" section of the theme's
    theme.json file. For example: 'default' or 'heading1'.
    @param defFont {String} The font to use if the specified key isn't present.
    Can be any valid font-face name such as 'Helvetica Neue' or 'Calibri'.
     */
    fontFace: function(key, defFont) {
      var fontSpec, hasDef, ret;
      ret = '';
      hasDef = defFont && String.is(defFont);
      if (!(key && key.trim())) {
        _reportError(HMSTATUS.invalidHelperUse, {
          helper: 'fontFace',
          error: HMSTATUS.missingParam,
          expected: 'key'
        });
        return ret;
      } else if (GenericHelpers.theme.fonts) {
        fontSpec = LO.get(GenericHelpers.theme.fonts, this.format + '.' + key);
        if (!fontSpec) {
          if (GenericHelpers.theme.fonts.all) {
            fontSpec = GenericHelpers.theme.fonts.all[key];
          }
        }
        if (fontSpec) {
          if (String.is(fontSpec)) {
            ret = fontSpec;
          } else if (_.isArray(fontSpec)) {
            ret = String.is(fontSpec[0]) ? fontSpec[0] : fontSpec[0].name;
          } else {
            ret = fontSpec.name;
          }
        }
      }
      if (!(ret && ret.trim())) {
        ret = defFont;
        if (!hasDef) {
          _reportError(HMSTATUS.invalidHelperUse, {
            helper: 'fontFace',
            error: HMSTATUS.missingParam,
            expected: 'defFont'
          });
          ret = '';
        }
      }
      return ret;
    },

    /**
    Emit a comma-delimited list of font names suitable associated with the
    provided key.
    @param key {String} A named style from the "fonts" section of the theme's
    theme.json file. For example: 'default' or 'heading1'.
    @param defFontList {Array} The font list to use if the specified key isn't
    present. Can be an array of valid font-face name such as 'Helvetica Neue'
    or 'Calibri'.
    @param sep {String} The default separator to use in the rendered output.
    Defaults to ", " (comma with a space).
     */
    fontList: function(key, defFontList, sep) {
      var fontSpec, hasDef, ret;
      ret = '';
      hasDef = defFontList && String.is(defFontList);
      if (!(key && key.trim())) {
        _reportError(HMSTATUS.invalidHelperUse, {
          helper: 'fontList',
          error: HMSTATUS.missingParam,
          expected: 'key'
        });
      } else if (GenericHelpers.theme.fonts) {
        fontSpec = LO.get(GenericHelpers.theme.fonts, this.format + '.' + key);
        if (!fontSpec) {
          if (GenericHelpers.theme.fonts.all) {
            fontSpec = GenericHelpers.theme.fonts.all[key];
          }
        }
        if (fontSpec) {
          if (String.is(fontSpec)) {
            ret = fontSpec;
          } else if (_.isArray(fontSpec)) {
            fontSpec = fontSpec.map(function(ff) {
              return "'" + (String.is(ff) ? ff : ff.name) + "'";
            });
            ret = fontSpec.join(sep === void 0 ? ', ' : sep || '');
          } else {
            ret = fontSpec.name;
          }
        }
      }
      if (!(ret && ret.trim())) {
        if (!hasDef) {
          _reportError(HMSTATUS.invalidHelperUse, {
            helper: 'fontList',
            error: HMSTATUS.missingParam,
            expected: 'defFontList'
          });
          ret = '';
        } else {
          ret = defFontList;
        }
      }
      return ret;
    },

    /**
    Capitalize the first letter of the word.
    @method section
     */
    camelCase: function(val) {
      val = (val && val.trim()) || '';
      if (val) {
        return val.charAt(0).toUpperCase() + val.slice(1);
      } else {
        return val;
      }
    },

    /**
    Return true if the context has the property or subpropery.
    @method has
     */
    has: function(title, options) {
      title = title && title.trim().toLowerCase();
      if (LO.get(this.r, title)) {
        return options.fn(this);
      }
    },

    /**
    Generic template helper function to display a user-overridable section
    title for a FRESH resume theme. Use this in lieue of hard-coding section
    titles.
    
    Usage:
    
        {{sectionTitle "sectionName"}}
        {{sectionTitle "sectionName" "sectionTitle"}}
    
    Example:
    
        {{sectionTitle "Education"}}
        {{sectionTitle "Employment" "Project History"}}
    
    @param sect_name The name of the section being title. Must be one of the
    top-level FRESH resume sections ("info", "education", "employment", etc.).
    @param sect_title The theme-specified section title. May be replaced by the
    user.
    @method sectionTitle
     */
    sectionTitle: function(sname, stitle) {
      stitle = (stitle && String.is(stitle) && stitle) || sname;
      return (this.opts.stitles && this.opts.stitles[sname.toLowerCase().trim()]) || stitle;
    },

    /**
    Convert inline Markdown to inline WordProcessingML.
    @method wpml
     */
    wpml: function(txt, inline) {
      if (!txt) {
        return '';
      }
      inline = (inline && !inline.hash) || false;
      txt = XML(txt.trim());
      txt = inline ? MD(txt).replace(/^\s*<p>|<\/p>\s*$/gi, '') : MD(txt);
      txt = H2W(txt);
      return txt;
    },

    /**
    Emit a conditional link.
    @method link
     */
    link: function(text, url) {
      if (url && url.trim()) {
        return '<a href="' + url + '">' + text + '</a>';
      } else {
        return text;
      }
    },

    /**
    Return the last word of the specified text.
    @method lastWord
     */
    lastWord: function(txt) {
      if (txt && txt.trim()) {
        return _.last(txt.split(' '));
      } else {
        return '';
      }
    },

    /**
    Convert a skill level to an RGB color triplet. TODO: refactor
    @method skillColor
    @param lvl Input skill level. Skill level can be expressed as a string
    ("beginner", "intermediate", etc.), as an integer (1,5,etc), as a string
    integer ("1", "5", etc.), or as an RRGGBB color triplet ('#C00000',
    '#FFFFAA').
     */
    skillColor: function(lvl) {
      var idx, skillColors;
      idx = skillLevelToIndex(lvl);
      skillColors = (this.theme && this.theme.palette && this.theme.palette.skillLevels) || ['#FFFFFF', '#5CB85C', '#F1C40F', '#428BCA', '#C00000'];
      return skillColors[idx];
    },

    /**
    Return an appropriate height. TODO: refactor
    @method lastWord
     */
    skillHeight: function(lvl) {
      var idx;
      idx = skillLevelToIndex(lvl);
      return ['38.25', '30', '16', '8', '0'][idx];
    },

    /**
    Return all but the last word of the input text.
    @method initialWords
     */
    initialWords: function(txt) {
      if (txt && txt.trim()) {
        return _.initial(txt.split(' ')).join(' ');
      } else {
        return '';
      }
    },

    /**
    Trim the protocol (http or https) from a URL/
    @method trimURL
     */
    trimURL: function(url) {
      if (url && url.trim()) {
        return url.trim().replace(/^https?:\/\//i, '');
      } else {
        return '';
      }
    },

    /**
    Convert text to lowercase.
    @method toLower
     */
    toLower: function(txt) {
      if (txt && txt.trim()) {
        return txt.toLowerCase();
      } else {
        return '';
      }
    },

    /**
    Convert text to lowercase.
    @method toLower
     */
    toUpper: function(txt) {
      if (txt && txt.trim()) {
        return txt.toUpperCase();
      } else {
        return '';
      }
    },

    /**
    Return true if either value is truthy.
    @method either
     */
    either: function(lhs, rhs, options) {
      if (lhs || rhs) {
        return options.fn(this);
      }
    },

    /**
    Conditional stylesheet link. Creates a link to the specified stylesheet with
    <link> or embeds the styles inline with <style></style>, depending on the
    theme author's and user's preferences.
    @param url {String} The path to the CSS file.
    @param linkage {String} The default link method. Can be either `embed` or
    `link`. If omitted, defaults to `embed`. Can be overridden by the `--css`
    command-line switch.
     */
    styleSheet: function(url, linkage) {
      var rawCss, renderedCss, ret;
      linkage = this.opts.css || linkage || 'embed';
      ret = '';
      if (linkage === 'link') {
        ret = printf('<link href="%s" rel="stylesheet" type="text/css">', url);
      } else {
        rawCss = FS.readFileSync(PATH.join(this.opts.themeObj.folder, '/src/', url), 'utf8');
        renderedCss = this.engine.generateSimple(this, rawCss);
        ret = printf('<style>%s</style>', renderedCss);
      }
      if (this.opts.themeObj.inherits && this.opts.themeObj.inherits.html && this.format === 'html') {
        ret += linkage === 'link' ? '<link href="' + this.opts.themeObj.overrides.path + '" rel="stylesheet" type="text/css">' : '<style>' + this.opts.themeObj.overrides.data + '</style>';
      }
      return ret;
    },

    /**
    Perform a generic comparison.
    See: http://doginthehat.com.au/2012/02/comparison-block-helper-for-handlebars-templates
    @method compare
     */
    compare: function(lvalue, rvalue, options) {
      var operator, operators, result;
      if (arguments.length < 3) {
        throw new Error("Handlerbars Helper 'compare' needs 2 parameters");
      }
      operator = options.hash.operator || "==";
      operators = {
        '==': function(l, r) {
          return l === r;
        },
        '===': function(l, r) {
          return l === r;
        },
        '!=': function(l, r) {
          return l !== r;
        },
        '<': function(l, r) {
          return l < r;
        },
        '>': function(l, r) {
          return l > r;
        },
        '<=': function(l, r) {
          return l <= r;
        },
        '>=': function(l, r) {
          return l >= r;
        },
        'typeof': function(l, r) {
          return typeof l === r;
        }
      };
      if (!operators[operator]) {
        throw new Error("Handlerbars Helper 'compare' doesn't know the operator " + operator);
      }
      result = operators[operator](lvalue, rvalue);
      if (result) {
        return options.fn(this);
      } else {
        return options.inverse(this);
      }
    }
  };


  /**
  Report an error to the outside world without throwing an exception. Currently
  relies on kludging the running verb into. opts.
   */

  _reportError = function(code, params) {
    return GenericHelpers.opts.errHandler.err(code, params);
  };


  /**
  Format a from/to date range for display.
   */

  _fromTo = function(dateA, dateB, fmt, sep, fallback) {
    var dateATrim, dateBTrim, dateFrom, dateTemp, dateTo, reserved;
    if (moment.isMoment(dateA) || moment.isMoment(dateB)) {
      _reportError(HMSTATUS.invalidHelperUse, {
        helper: 'dateRange'
      });
      return '';
    }
    dateFrom = null;
    dateTo = null;
    dateTemp = null;
    dateA = dateA || '';
    dateB = dateB || '';
    dateATrim = dateA.trim().toLowerCase();
    dateBTrim = dateB.trim().toLowerCase();
    reserved = ['current', 'present', 'now', ''];
    fmt = (fmt && String.is(fmt) && fmt) || 'YYYY-MM';
    sep = (sep && String.is(sep) && sep) || ' — ';
    if (_.contains(reserved, dateATrim)) {
      dateFrom = fallback || '???';
    } else {
      dateTemp = FluentDate.fmt(dateA);
      dateFrom = dateTemp.format(fmt);
    }
    if (_.contains(reserved, dateBTrim)) {
      dateTo = fallback || 'Current';
    } else {
      dateTemp = FluentDate.fmt(dateB);
      dateTo = dateTemp.format(fmt);
    }
    if (dateFrom && dateTo) {
      return dateFrom + sep + dateTo;
    } else if (dateFrom || dateTo) {
      return dateFrom || dateTo;
    }
    return '';
  };

  skillLevelToIndex = function(lvl) {
    var idx, intVal;
    idx = 0;
    if (String.is(lvl)) {
      lvl = lvl.trim().toLowerCase();
      intVal = parseInt(lvl);
      if (isNaN(intVal)) {
        switch (lvl) {
          case 'beginner':
            idx = 1;
            break;
          case 'intermediate':
            idx = 2;
            break;
          case 'advanced':
            idx = 3;
            break;
          case 'master':
            idx = 4;
        }
      } else {
        idx = Math.min(intVal / 2, 4);
        idx = Math.max(0, idx);
      }
    } else {
      idx = Math.min(lvl / 2, 4);
      idx = Math.max(0, idx);
    }
    return idx;
  };

}).call(this);

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