package main

import "strings"
import "strconv"
import "errors"

/*
"You received a friend invite from {user}"
"{x}{mentioned you on}{user}{'s profile}"
"{x}{mentioned you in}{topic}"
"{x}{likes}{you}"
"{x}{liked}{your topic}{topic}"
"{x}{liked}{your post on}{user}{'s profile}" todo
"{x}{liked}{your post in}{topic}"
"{x}{replied to}{your post in}{topic}" todo
"{x}{replied to}{topic}"
"{x}{replied to}{your topic}{topic}"
"{x}{created a new topic}{topic}"
*/

func build_alert(event string, elementType string, actor_id int, targetUser_id int, elementID int, user User /* The current user */) (string, error) {
  var targetUser *User

  actor, err := users.CascadeGet(actor_id)
  if err != nil {
    return "", errors.New("Unable to find the actor")
  }

  /*if elementType != "forum" {
    targetUser, err = users.CascadeGet(targetUser_id)
    if err != nil {
      LocalErrorJS("Unable to find the target user",w,r)
      return
    }
  }*/

  if event == "friend_invite" {
    return `{"msg":"You received a friend invite from {0}","sub":["` + actor.Name + `"],"path":"\/user\/`+strconv.Itoa(actor.ID)+`","avatar":"`+strings.Replace(actor.Avatar,"/","\\/",-1)+`"}`, nil
  }

  var act, post_act, url, area string
  var start_frag, end_frag string
  switch(elementType) {
    case "forum":
      if event == "reply" {
        act = "created a new topic"
        topic, err := topics.CascadeGet(elementID)
        if err != nil {
          return "", errors.New("Unable to find the linked topic")
        }
        url = build_topic_url(elementID)
        area = topic.Title
        // Store the forum ID in the targetUser column instead of making a new one? o.O
        // Add an additional column for extra information later on when we add the ability to link directly to posts. We don't need the forum data for now...
      } else {
        act = "did something in a forum"
      }
    case "topic":
      topic, err := topics.CascadeGet(elementID)
      if err != nil {
          return "", errors.New("Unable to find the linked topic")
      }
      url = build_topic_url(elementID)
      area = topic.Title

      if targetUser_id == user.ID {
        post_act = " your topic"
      }
    case "user":
      targetUser, err = users.CascadeGet(elementID)
      if err != nil {
          return "", errors.New("Unable to find the target user")
      }
      area = targetUser.Name
      end_frag = "'s profile"
      url = build_profile_url(elementID)
    case "post":
      topic, err := get_topic_by_reply(elementID)
      if err != nil {
          return "", errors.New("Unable to find the linked reply or parent topic")
      }
      url = build_topic_url(topic.ID)
      area = topic.Title
      if targetUser_id == user.ID {
        post_act = " your post in"
      }
    default:
        return "", errors.New("Invalid elementType")
  }

  switch(event) {
    case "like":
      if elementType == "user" {
        act = "likes"
        end_frag = ""
        if targetUser.ID == user.ID {
          area = "you"
        }
      } else {
        act = "liked"
      }
    case "mention":
      if elementType == "user" {
        act = "mentioned you on"
      } else {
        act = "mentioned you in"
        post_act = ""
      }
    case "reply": act = "replied to"
  }

  return `{"msg":"{0} ` + start_frag + act + post_act + ` {1}` + end_frag + `","sub":["` + actor.Name + `","` + area + `"],"path":"` + url + `","avatar":"` + actor.Avatar + `"}`, nil
}