import { util } from '@citation-js/core';
import config from '../config.js';
const stopWords = new Set(['the', 'a', 'an']);
const unsafeChars = /(?:<\/?.*?>|[\u0020-\u002F\u003A-\u0040\u005B-\u005E\u0060\u007B-\u007F])+/g;
const unicode = /[^\u0020-\u007F]+/g;
function firstWord(text) {
  if (!text) {
    return '';
  } else {
    return text.normalize('NFKD').replace(unicode, '').split(unsafeChars).find(word => word.length && !stopWords.has(word.toLowerCase()));
  }
}
const name = new util.Translator([{
  source: 'given',
  target: 'given'
}, {
  source: 'family',
  target: 'family'
}, {
  source: 'suffix',
  target: 'suffix'
}, {
  source: 'prefix',
  target: 'non-dropping-particle'
}, {
  source: 'family',
  target: 'literal',
  when: {
    source: false,
    target: {
      family: false,
      given: false
    }
  }
}]);
const months = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];
export const TYPE = 'BibTeX type';
export const LABEL = 'BibTeX label';
export const MONTHS = {
  jan: 1,
  feb: 2,
  mar: 3,
  apr: 4,
  may: 5,
  jun: 6,
  jul: 7,
  aug: 8,
  sep: 9,
  oct: 10,
  nov: 11,
  dec: 12,
  january: 1,
  february: 2,
  march: 3,
  april: 4,
  may: 5,
  june: 6,
  july: 7,
  august: 8,
  september: 9,
  october: 10,
  november: 11,
  december: 12
};
export const TYPE_KEYS = {
  bathesis: 'Bachelor\'s thesis',
  mathesis: 'Master\'s thesis',
  phdthesis: 'PhD thesis',
  candthesis: 'Candidate thesis',
  techreport: 'technical report',
  resreport: 'research report',
  software: 'computer software',
  datacd: 'data cd',
  audiocd: 'audio cd',
  patent: 'patent',
  patentde: 'German patent',
  patenteu: 'European patent',
  patentfr: 'French patent',
  patentuk: 'British patent',
  patentus: 'U.S. patent',
  patreq: 'patent request',
  patreqde: 'German patent request',
  patreqeu: 'European patent request',
  patreqfr: 'French patent request',
  patrequk: 'British patent request',
  patrequs: 'U.S. patent request'
};
export const STANDARD_NUMBERS_PATTERN = /(^(?:ISAN )?(?:[0-9a-f]{4}-){4}[0-9a-z](?:-(?:[0-9a-f]{4}-){2}[0-9a-z])?$)|(^(?:979-?0-?|M-?)(?:\d{9}|(?=[\d-]{11}$)\d+-\d+-\d)$)|(^ISRN .{1,36}$)|(^(?:ISWC )?T-?\d{9}-?\d$)/i;
export function parseDate(date) {
  const parts = date.split('T')[0].replace(/[?~%]$/, '').split('-');
  const year = +parts[0].replace(/^Y(?=-?\d{4}\d+)/, '').replace(/X/g, '0');
  const month = +parts[1];
  const day = +parts[2];
  if (!month || month > 20) {
    return [year];
  } else if (!day) {
    return [year, month];
  } else {
    return [year, month, day];
  }
}
export function parseMonth(value) {
  if (value == null) {
    return [];
  }
  if (+value) {
    return [parseInt(value, 10)];
  }
  value = value.trim().toLowerCase();
  if (value in MONTHS) {
    return [MONTHS[value]];
  }
  const parts = value.split(/\s+/);
  let month;
  let day;
  if (parts[0] in MONTHS) {
    month = MONTHS[parts[0]];
    day = parseInt(parts[1]);
  } else if (parts[1] in MONTHS) {
    month = MONTHS[parts[1]];
    day = parseInt(parts[0]);
  }
  return day ? [month, day] : month ? [month] : [];
}
export function formatLabel(author, issued, suffix, title) {
  let label = '';
  if (author && author[0]) {
    label += firstWord(author[0].family || author[0].literal);
  }
  if (issued && issued['date-parts'] && issued['date-parts'][0]) {
    label += issued['date-parts'][0][0];
  }
  if (suffix) {
    label += suffix;
  } else if (title) {
    label += firstWord(title);
  }
  return label;
}
export const Converters = {
  PICK: {
    toTarget(...args) {
      return args.find(Boolean);
    },
    toSource(value) {
      return [value];
    }
  },
  DATE: {
    toTarget(date) {
      const parts = date.split('/').map(part => part && part !== '..' ? parseDate(part) : undefined);
      return isNaN(parts[0][0]) ? {
        literal: date
      } : {
        'date-parts': parts
      };
    },
    toSource(date) {
      if ('date-parts' in date) {
        return date['date-parts'].map(datePart => datePart.map(datePart => datePart.toString().padStart(2, '0')).join('-')).join('/');
      }
    }
  },
  YEAR_MONTH: {
    toTarget(year, month, day) {
      if (isNaN(+year)) {
        return {
          literal: year
        };
      } else if (!isNaN(+day) && !isNaN(+month)) {
        return {
          'date-parts': [[+year, +month, +day]]
        };
      } else {
        return {
          'date-parts': [[+year, ...parseMonth(month)]]
        };
      }
    },
    toSource(date) {
      if ('date-parts' in date) {
        const [year, month, day] = date['date-parts'][0];
        return [year.toString(), month ? day ? `${months[month - 1]} ${day}` : month : undefined];
      } else {
        return [];
      }
    }
  },
  EPRINT: {
    toTarget(id, type) {
      if (type === 'pubmed') {
        return id;
      }
    },
    toSource(id) {
      return [id, 'pubmed'];
    }
  },
  EVENT_TITLE: {
    toTarget(title, addon) {
      if (addon) {
        title += ' (' + addon + ')';
      }
      return title;
    },
    toSource(title) {
      return title.match(/^(.+)(?: \((.+)\))?$/).slice(1, 3);
    }
  },
  HOW_PUBLISHED: {
    toTarget(howPublished) {
      if (howPublished.startsWith('http')) {
        return howPublished;
      }
    }
  },
  KEYWORDS: {
    toTarget(list) {
      return list.join(',');
    },
    toSource(list) {
      return list.split(',');
    }
  },
  LABEL: {
    toTarget(label) {
      return [label, label];
    },
    toSource(id, label, author, issued, suffix, title) {
      let safeId;
      if (id === null) {
        safeId = 'null';
      } else if (id === undefined) {
        safeId = 'undefined';
      } else {
        safeId = id.toString().replace(unsafeChars, '');
      }
      if (config.format.useIdAsLabel) {
        return safeId;
      }
      if (label && !unsafeChars.test(label)) {
        return label;
      } else {
        return formatLabel(author, issued, suffix, title) || safeId;
      }
    }
  },
  NAMES: {
    toTarget(list) {
      return list.map(name.convertToTarget);
    },
    toSource(list) {
      return list.map(name.convertToSource);
    }
  },
  NAMES_ORCID: {
    toTarget(list, orcid) {
      return list.map((inputName, i) => {
        var _orcid$item;
        const outputName = name.convertToTarget(inputName);
        if (typeof (orcid === null || orcid === void 0 || (_orcid$item = orcid.item) === null || _orcid$item === void 0 ? void 0 : _orcid$item[i]) === 'string') {
          outputName._orcid = orcid.item[i];
        }
        return outputName;
      });
    },
    toSource(list) {
      const names = [];
      const orcid = [];
      for (let i = 0; i < list.length; i++) {
        names.push(name.convertToSource(list[i]));
        if (list[i]._orcid) {
          orcid[i] = list[i]._orcid;
        }
      }
      return [names, orcid.length ? {
        item: orcid
      } : undefined];
    }
  },
  PAGES: {
    toTarget(pages) {
      return pages.replace(/[–—]/, '-');
    },
    toSource(pages) {
      return pages.replace('-', '--');
    }
  },
  STANDARD_NUMBERS: {
    toTarget(...args) {
      return args.find(Boolean);
    },
    toSource(number) {
      const match = number.toString().match(STANDARD_NUMBERS_PATTERN);
      return match ? match.slice(1, 5) : [];
    }
  },
  STATUS: {
    toSource(state) {
      if (/^(inpreparation|submitted|forthcoming|inpress|prepublished)$/i.test(state)) {
        return state;
      }
    }
  },
  TITLE: {
    toTarget(title, subtitle, addon) {
      if (subtitle) {
        title += ': ' + subtitle;
      }
      return title;
    },
    toSource(title) {
      return [title];
    }
  }
};