var Redis = require("ioredis");
var redis = new Redis();
var auth_gen = require("./../utils/auth-keys.js");
var permissions_controller = require("./permissions-controller.js");

module.exports = {
  get_password: function (user, complete) {
    var user_key = "user:" + user;

    redis.hget(user_key, "password", function (err, password) {
      if (password) {
        complete(password);
      } else {
        complete("");
      }
    });
  },

  get_public_user_info: function (user, complete) {
    var user_key = "user:" + user;

    redis.hgetall(user_key, function(err, result) {
      if (result.password) {

        var public = {};
        public.username = user;
        public.societies = JSON.parse(result.societies) || [];
        var society_controller = require("./society-controller.js");
        var soc_names = [];
        for (var ii = 0; ii < public.societies.length; ii++) {
          society_controller.get_society(public.societies[ii], function (response) {
            soc_names.push(response.society.name);
            if (soc_names.length === public.societies.length) {
              public.societies = soc_names;
              public.friends = JSON.parse(result.friends) || [];
              public.accepted_events = JSON.parse(result.accepted_events) || [];
              public.declined_events = JSON.parse(result.declined_events) || [];
              complete({
                "user": public,
                "error": 0
              });
            }
          });
        }
        if (public.societies.length === 0) {
          public.friends = JSON.parse(result.friends) || [];
          public.accepted_events = JSON.parse(result.accepted_events) || [];
          public.declined_events = JSON.parse(result.declined_events) || [];
          complete({
            "user": public,
            "error": 0
          });
        }
      } else {
        complete({
          "user": {},
          "error": 1
        });
      }
    });
  },

  get_raw_user: function (user, complete) {
    var user_key = "user:" + user;

    redis.hgetall(user_key, function(err, result) {
      complete(result);
    });
  },

  get_all_public_infos: function (complete) {
    var self = this;
    var stream = redis.scanStream({
      match: "user:*"
    });
    var usernames = [];
    stream.on('data', function (keys) {
      keys.map(function (key) {
        usernames.push(key.split(":")[1]);
      });
    });
    stream.on('end', function () {
      var user_objects = [];
      if (usernames.length === 0) {
        complete({
          "users": []
        })
      } else {
        for (var ii = 0; ii < usernames.length; ii++) {
          self.get_public_user_info(usernames[ii], function (response) {
            user_objects.push(response.user);
            if (user_objects.length === usernames.length) {
              user_objects.sort(function(a, b) {
                var textA = a.username.toLowerCase();
                var textB = b.username.toLowerCase();
                return (textA < textB) ? -1 : (textA > textB) ? 1 : 0;
              });
              complete({
                "users": user_objects
              })
            }
          });
        }
      }
    });
  },

  get_user_from_auth: function (auth, complete) {
    var auth_key = "auth-key:" + auth;

    redis.get(auth_key, function (err, username) {
      if (username) {
        complete(username);
      } else {
        complete("");
      }
    });
  },

  user_exists: function (user, complete) {
    var user_key = "user:" + user;

    redis.hgetall(user_key, function (err, result) {
      complete(!!result.password);
    });
  },

  authenticate: function (user, pass, complete) {
    permissions_controller.user_can_auth(user, pass, function (success) {
      var user_key = "user:" + user;

      if (success) {
        redis.hget(user_key, "auth-key", function (err, auth) {
          var new_auth_key = auth_gen.generate(user);
          if (auth) {
            redis.del("auth-key:" + auth);
          }
          redis.set("auth-key:" + new_auth_key, user);
          redis.hset(user_key, "auth-key", new_auth_key);

          complete({
            "logged_in": 1,
            "auth-key": new_auth_key,
            "error": 0
          });
        });
      } else {
        complete({
          "logged_in": 0,
          "error": 1
        });
      }
    });
  },

  register: function (user, pass, complete) {
    var user_key = "user:" + user;
    var auth_key = "";
    var new_user = {};

    this.user_exists(user, function (exists) {
      if (exists) {
        complete({
          "registered": 0,
          "error": 1
        });
      } else {
        bcrypt.hash(pass, null, null, function (err, hash) {
          new_user["password"] = hash;
          new_user["auth-key"] = auth_gen.generate(user);
          auth_key = "auth-key:" + new_user["auth-key"];

          redis.hset(user_key, "password", new_user["password"]);
          redis.hset(user_key, "auth-key", new_user["auth-key"]);
          redis.hset(user_key, "societies", JSON.stringify([]));
          redis.hset(user_key, "friends", JSON.stringify([]));
          redis.hset(user_key, "pending_events", JSON.stringify([]));
          redis.hset(user_key, "accepted_events", JSON.stringify([]));
          redis.hset(user_key, "declined_events", JSON.stringify([]));
          redis.set(auth_key, user);
          complete({
            "registered": 1,
            "auth-key": new_user["auth-key"],
            "error": 0
          })
        });
      }
    });
  },

  add_friend: function(friend, auth, complete) {
    var self = this;
    friend = friend.toLowerCase();
    self.get_user_from_auth(auth, function (username) {
      if (username) {
        if (username.toLowerCase() !== friend.toLowerCase()) {
        self.get_public_user_info(username, function (userdata) {
          var friends = userdata.user.friends;
          if (friends.indexOf(friend) > -1) {
            complete({
              "success": 0,
              "error": 2
            });
          } else {
            self.user_exists(friend, function (exists) {
              if (exists) {
                friends.push(friend);
                redis.hset("user:" + username.toLowerCase(), "friends", JSON.stringify(friends));
                complete({
                  "success": 1,
                  "error": 0
                });
              } else {
                complete({
                  "success": 0,
                  "error": 3
                });
              }
            });
          }
        });
        } else {
          complete({
            "success": 0,
            "error": 4
          });
        }
      } else {
        complete({
          "success": 0,
          "error": 1
        });
      }
    });
  },

  remove_friend: function(friend, auth, complete) {
    var self = this;
    friend = friend.toLowerCase();
    self.get_user_from_auth(auth, function (username) {
      if (username) {
        self.get_public_user_info(username, function (userdata) {
          var friends = userdata.user.friends;
          if (friends.indexOf(friend) === -1) {
            complete({
              "success": 0,
              "error": 2
            });
          } else {
            friends.splice(friends.indexOf(friend), 1);
            redis.hset("user:" + username.toLowerCase(), "friends", JSON.stringify(friends));
            complete({
              "success": 1,
              "error": 0
            });
          }
        });
      } else {
        complete({
          "success": 0,
          "error": 1
        });
      }
    });
  }
}