import bcrypt from "bcrypt-nodejs";
import crypto from "crypto";
import mongoose from "mongoose";

export type UserModel = mongoose.Document & {
  email: string,
  password: string,
  passwordResetToken: string,
  passwordResetExpires: Date,

  facebook: string,
  tokens: AuthToken[],

  profile: {
    name: string,
    gender: string,
    location: string,
    website: string,
    picture: string
  },

  comparePassword: comparePasswordFunction,
  gravatar: (size: number) => string
};

type comparePasswordFunction = (candidatePassword: string, cb: (err: any, isMatch: any) => {}) => void;

export type AuthToken = {
  accessToken: string,
  kind: string
};

const userSchema = new mongoose.Schema({
  email: { type: String, unique: true },
  password: String,
  passwordResetToken: String,
  passwordResetExpires: Date,

  facebook: String,
  twitter: String,
  google: String,
  tokens: Array,

  profile: {
    name: String,
    gender: String,
    location: String,
    website: String,
    picture: String
  }
}, { timestamps: true });

/**
 * Password hash middleware.
 */
userSchema.pre("save", function save(next) {
  const user = this;
  if (!user.isModified("password")) { return next(); }
  bcrypt.genSalt(10, (err, salt) => {
    if (err) { return next(err); }
    bcrypt.hash(user.password, salt, undefined, (err: mongoose.Error, hash) => {
      if (err) { return next(err); }
      user.password = hash;
      next();
    });
  });
});

const comparePassword: comparePasswordFunction = function (candidatePassword, cb) {
  bcrypt.compare(candidatePassword, this.password, (err: mongoose.Error, isMatch: boolean) => {
    cb(err, isMatch);
  });
};

userSchema.methods.comparePassword = comparePassword;

/**
 * Helper method for getting user's gravatar.
 */
userSchema.methods.gravatar = function (size: number) {
  if (!size) {
    size = 200;
  }
  if (!this.email) {
    return `https://gravatar.com/avatar/?s=${size}&d=retro`;
  }
  const md5 = crypto.createHash("md5").update(this.email).digest("hex");
  return `https://gravatar.com/avatar/${md5}?s=${size}&d=retro`;
};

// export const User: UserType = mongoose.model<UserType>('User', userSchema);
const User = mongoose.model("User", userSchema);
export default User;