var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var customField = {
  _id: false,
  customField: { type: Schema.Types.ObjectId, ref: 'CustomField' },
  text: Schema.Types.Mixed,
};

var VulnerabilityDetails = {
  _id: false,
  locale: String,
  // language:       String,
  title: { type: String, unique: true, sparse: true },
  vulnType: String,
  description: String,
  observation: String,
  remediation: String,
  cwes: [String],
  references: [String],
  customFields: [customField],
};

var VulnerabilitySchema = new Schema(
  {
    cvssv3: String,
    priority: { type: Number, enum: [1, 2, 3, 4] },
    remediationComplexity: { type: Number, enum: [1, 2, 3] },
    details: [VulnerabilityDetails],
    status: { type: Number, enum: [0, 1, 2], default: 1 }, // 0: validated, 1: created, 2: updated,
    category: String,
    creator: { type: Schema.Types.ObjectId, ref: 'User' },
  },
  { timestamps: true },
);

/*
 *** Statics ***
 */

// Get all vulnerabilities
VulnerabilitySchema.statics.getAll = () => {
  return new Promise((resolve, reject) => {
    var query = Vulnerability.find();
    query.populate('creator', '-_id username');
    query
      .exec()
      .then(rows => {
        resolve(rows);
      })
      .catch(err => {
        reject(err);
      });
  });
};

// Get all vulnerabilities for download
VulnerabilitySchema.statics.export = () => {
  return new Promise((resolve, reject) => {
    var query = Vulnerability.find();
    query.select(
      'details cvssv3 priority remediationComplexity cwes references category -_id',
    );
    query
      .exec()
      .then(rows => {
        resolve(rows);
      })
      .catch(err => {
        reject(err);
      });
  });
};

// Create vulnerability
VulnerabilitySchema.statics.create = vulnerabilities => {
  return new Promise((resolve, reject) => {
    Vulnerability.insertMany(vulnerabilities, { ordered: false })
      .then(rows => {
        resolve({ created: rows.length, duplicates: 0 });
      })
      .catch(err => {
        if (err.code === 11000) {
          if (err.result.nInserted === 0)
            reject({
              fn: 'BadParameters',
              message: 'Vulnerability title already exists',
            });
          else {
            var errorMessages = [];
            err.writeErrors.forEach(e =>
              errorMessages.push(e.errmsg || 'no errmsg'),
            );
            resolve({
              created: err.result.nInserted,
              duplicates: errorMessages,
            });
          }
        } else reject(err);
      });
  });
};

// Update vulnerability
VulnerabilitySchema.statics.update = (vulnerabilityId, vulnerability) => {
  return new Promise((resolve, reject) => {
    var VulnerabilityUpdate = mongoose.model('VulnerabilityUpdate');
    var query = Vulnerability.findByIdAndUpdate(vulnerabilityId, vulnerability);
    query
      .exec()
      .then(row => {
        if (!row)
          reject({ fn: 'NotFound', message: 'Vulnerability not found' });
        else {
          var query = VulnerabilityUpdate.deleteMany({
            vulnerability: vulnerabilityId,
          });
          return query.exec();
        }
      })
      .then(row => {
        resolve('Vulnerability updated successfully');
      })
      .catch(err => {
        if (err.code === 11000)
          reject({
            fn: 'BadParameters',
            message: 'Vulnerability title already exists',
          });
        else reject(err);
      });
  });
};

// Delete all vulnerabilities
VulnerabilitySchema.statics.deleteAll = () => {
  return new Promise((resolve, reject) => {
    var query = Vulnerability.deleteMany();
    query
      .exec()
      .then(() => {
        resolve('All vulnerabilities deleted successfully');
      })
      .catch(err => {
        reject(err);
      });
  });
};

// Delete vulnerability
VulnerabilitySchema.statics.delete = vulnerabilityId => {
  return new Promise((resolve, reject) => {
    var query = Vulnerability.findByIdAndDelete(vulnerabilityId);
    query
      .exec()
      .then(rows => {
        if (rows) resolve(rows);
        else reject({ fn: 'NotFound', message: 'Vulnerability not found' });
      })
      .catch(err => {
        reject(err);
      });
  });
};

// Get vulnerabilities by language
VulnerabilitySchema.statics.getAllByLanguage = locale => {
  return new Promise((resolve, reject) => {
    var query = Vulnerability.find({ 'details.locale': locale });
    query.select('details cvssv3 priority remediationComplexity category');
    query
      .exec()
      .then(rows => {
        if (rows) {
          var result = [];
          rows.forEach(row => {
            row.details.forEach(detail => {
              if (detail.locale === locale && detail.title) {
                var temp = {};
                temp.cvssv3 = row.cvssv3;
                temp.priority = row.priority;
                temp.remediationComplexity = row.remediationComplexity;
                temp.category = row.category;
                temp.detail = detail;
                temp._id = row._id;
                result.push(temp);
              }
            });
          });
          resolve(result);
        } else
          reject({
            fn: 'NotFound',
            message: 'Locale with existing title not found',
          });
      })
      .catch(err => {
        reject(err);
      });
  });
};

VulnerabilitySchema.statics.Merge = (vulnIdPrime, vulnIdMerge, locale) => {
  return new Promise((resolve, reject) => {
    var mergeDetail = null;
    var mergeVuln = null;
    var primeVuln = null;
    var query = Vulnerability.findById(vulnIdMerge);
    query
      .exec()
      .then(row => {
        if (!row)
          reject({ fn: 'NotFound', message: 'Vulnerability not found' });
        else {
          mergeVuln = row;
          mergeDetail = row.details.find(d => d.locale === locale);
          var query = Vulnerability.findById(vulnIdPrime);
          return query.exec();
        }
      })
      .then(row => {
        if (!row)
          reject({ fn: 'NotFound', message: 'Vulnerability not found' });
        else {
          if (row.details.findIndex(d => d.locale === locale && d.title) !== -1)
            reject({
              fn: 'BadParameters',
              message: 'Language already exists in this vulnerability',
            });
          else {
            primeVuln = row;
            var removeIndex = mergeVuln.details
              .map(d => d.title)
              .indexOf(mergeDetail.title);
            mergeVuln.details.splice(removeIndex, 1);
            if (mergeVuln.details.length === 0)
              return Vulnerability.findByIdAndDelete(mergeVuln._id);
            else return mergeVuln.save();
          }
        }
      })
      .then(() => {
        var detail = {};
        detail.locale = mergeDetail.locale;
        detail.title = mergeDetail.title;
        if (mergeDetail.vulnType) detail.vulnType = mergeDetail.vulnType;
        if (mergeDetail.description)
          detail.description = mergeDetail.description;
        if (mergeDetail.observation)
          detail.observation = mergeDetail.observation;
        if (mergeDetail.remediation)
          detail.remediation = mergeDetail.remediation;
        if (mergeDetail.customFields)
          detail.customFields = mergeDetail.customFields;
        primeVuln.details.push(detail);
        return primeVuln.save();
      })
      .then(() => {
        resolve('Vulnerability merge successfull');
      })
      .catch(err => {
        reject(err);
      });
  });
};

/*
 *** Methods ***
 */

var Vulnerability = mongoose.model('Vulnerability', VulnerabilitySchema);
module.exports = Vulnerability;