moment = require('moment')
_ = require('lodash')
helpers = require('./helpers.coffee')
items = require('./items.coffee')
{pets, hatchingPotions} = items.items

# Very strange bug where `require(./script/helpers.coffee)` is returning a blank object under certain circumsntances I haven't yet figured out
helpers = require('habitrpg-shared/script/helpers') if _.isEmpty(helpers)

XP = 15
HP = 2
obj = module.exports = {}


obj.priorityValue = (priority = '!') ->
  switch priority
    when '!' then 1
    when '!!' then 1.5
    when '!!!' then 2
    else 1

obj.tnl = (level) ->
  if level >= 100
    value = 0
  else
    value = Math.round(((Math.pow(level, 2) * 0.25) + (10 * level) + 139.75) / 10) * 10
  # round to nearest 10
  return value

###
  Calculates Exp modificaiton based on level and weapon strength
  {value} task.value for exp gain
  {weaponStrength) weapon strength
  {level} current user level
  {priority} user-defined priority multiplier
###
obj.expModifier = (value, weaponStr, level, priority = '!') ->
  str = (level - 1) / 2
  # ultimately get this from user
  totalStr = (str + weaponStr) / 100
  strMod = 1 + totalStr
  exp = value * XP * strMod * obj.priorityValue(priority)
  return Math.round(exp)

###
  Calculates HP modification based on level and armor defence
  {value} task.value for hp loss
  {armorDefense} defense from armor
  {helmDefense} defense from helm
  {level} current user level
  {priority} user-defined priority multiplier
###
obj.hpModifier = (value, armorDef, helmDef, shieldDef, level, priority = '!') ->
  def = (level - 1) / 2
  # ultimately get this from user?
  totalDef = (def + armorDef + helmDef + shieldDef) / 100
  #ultimate get this from user
  defMod = 1 - totalDef
  hp = value * HP * defMod * obj.priorityValue(priority)
  return Math.round(hp * 10) / 10
# round to 1dp

###
  Future use
  {priority} user-defined priority multiplier
###
obj.gpModifier = (value, modifier, priority = '!', streak, user) ->
  val = value * modifier * obj.priorityValue(priority)
  if streak and user
    streakBonus = streak / 100 + 1 # eg, 1-day streak is 1.1, 2-day is 1.2, etc
    afterStreak = val * streakBonus
    (user._tmp?={}).streakBonus = afterStreak - val if (val > 0) # keep this on-hand for later, so we can notify streak-bonus
    return afterStreak
  else
    return val

###
  Calculates the next task.value based on direction
  Uses a capped inverse log y=.95^x, y>= -5
  {currentValue} the current value of the task
  {direction} up or down
###
obj.taskDeltaFormula = (currentValue, direction) ->
  if currentValue < -47.27 then currentValue = -47.27
  else if currentValue > 21.27 then currentValue = 21.27
  delta = Math.pow(0.9747, currentValue)
  return delta if direction is 'up'
  return -delta


###
  Drop System
###

randomDrop = (user, delta, priority, streak = 0, options={}) ->
  paths = options.paths || {}
  # limit drops to 2 / day
  user.items.lastDrop ?=
    date: +moment().subtract('d', 1) # trick - set it to yesterday on first run, that way they can get drops today
    count: 0
  paths['items.lastDrop'] = true
  reachedDropLimit = (helpers.daysBetween(user.items.lastDrop.date, +new Date) is 0) and (user.items.lastDrop.count >= 2)
  return if reachedDropLimit

  # % chance of getting a pet or meat
  chanceMultiplier = Math.abs(delta)
  chanceMultiplier *= obj.priorityValue(priority) # multiply chance by reddness
  chanceMultiplier += streak # streak bonus

  if user.flags?.dropsEnabled and Math.random() < (.05 * chanceMultiplier)
    # current breakdown - 1% (adjustable) chance on drop
    # If they got a drop: 50% chance of egg, 50% Hatching Potion. If hatchingPotion, broken down further even further
    rarity = Math.random()

    # Egg, 50% chance
    if rarity > .5
      drop = helpers.randomVal(pets)
      (user.items.eggs ?= []).push drop; paths['items.eggs'] = true
      drop.type = 'Egg'
      drop.dialog = "You've found a #{drop.text} Egg! #{drop.notes}"

      # Hatching Potion, 50% chance - break down by rarity even more. FIXME this may not be the best method, so revisit
    else
      acceptableDrops = []

      # Tier 5 (Blue Moon Rare)
      if rarity < .1
        acceptableDrops =
          ['Base', 'White', 'Desert', 'Red', 'Shade', 'Skeleton', 'Zombie', 'CottonCandyPink', 'CottonCandyBlue',
           'Golden']

        # Tier 4 (Very Rare)
      else if rarity < .2
        acceptableDrops =
          ['Base', 'White', 'Desert', 'Red', 'Shade', 'Skeleton', 'Zombie', 'CottonCandyPink', 'CottonCandyBlue']

        # Tier 3 (Rare)
      else if rarity < .3
        acceptableDrops = ['Base', 'White', 'Desert', 'Red', 'Shade', 'Skeleton']
      
      # Commented out for testing with increased egg drop, delete if successful
        # Tier 2 (Scarce)
      # else if rarity < .4
      #   acceptableDrops = ['Base', 'White', 'Desert']
      
        # Tier 1 (Common)
      else
        acceptableDrops = ['Base', 'White', 'Desert']

      acceptableDrops = hatchingPotions.filter (hatchingPotion) ->
        hatchingPotion.name in acceptableDrops
      drop = helpers.randomVal acceptableDrops
      (user.items.hatchingPotions ?= []).push drop.name; paths['items.hatchingPotions'] = true
      drop.type = 'HatchingPotion'
      drop.dialog = "You've found a #{drop.text} Hatching Potion! #{drop.notes}"

    # if they've dropped something, we want the consuming client to know so they can notify the user. See how the Derby
    # app handles it for example. Would this be better handled as an emit() ?
    (user._tmp?={}).drop = drop

    user.items.lastDrop.date = +new Date
    user.items.lastDrop.count++
    paths['items.lastDrop'] = true

#  {task} task you want to score
#  {direction} 'up' or 'down'
obj.score = (user, task, direction, options={}) ->
  {gp, hp, exp, lvl} = user.stats
  {type, value, streak} = task
  [paths, times, cron] = [options.paths || {}, options.times || 1, options.cron || false]
  priority = task.priority or '!'

  # If they're trying to purhcase a too-expensive reward, confirm they want to take a hit for it
  if task.value > user.stats.gp and task.type is 'reward'
#    check if we can show user the confirmation window. If yes, show it. If no, just shut up and do what is requested (for API).
    if confirm?
      return unless confirm "Not enough GP to purchase this reward, buy anyway and lose HP? (Punishment for taking a reward you didn't earn)."

  delta = 0
  calculateDelta = (adjustvalue = true) ->
    # If multiple days have passed, multiply times days missed
    _.times times, ->
      # Each iteration calculate the delta (nextDelta), which is then accumulated in delta
      # (aka, the total delta). This weirdness won't be necessary when calculating mathematically
      # rather than iteratively
      nextDelta = obj.taskDeltaFormula(value, direction)
      value += nextDelta if adjustvalue
      delta += nextDelta

  addPoints = ->
    level = user.stats.lvl
    weaponStrength = items.items.weapon[user.items.weapon].strength
    exp += obj.expModifier(delta, weaponStrength, level, priority) / 2 # /2 hack for now, people leveling too fast
    if streak
      gp += obj.gpModifier(delta, 1, priority, streak, user)
    else
      gp += obj.gpModifier(delta, 1, priority)


  subtractPoints = ->
    level = user.stats.lvl
    armorDefense = items.items.armor[user.items.armor].defense
    helmDefense = items.items.head[user.items.head].defense
    shieldDefense = items.items.shield[user.items.shield].defense
    hp += obj.hpModifier(delta, armorDefense, helmDefense, shieldDefense, level, priority)

  switch type
    when 'habit'
      calculateDelta()
      # Add habit value to habit-history (if different)
      if (delta > 0) then addPoints() else subtractPoints()
      if task.value != value
        (task.history ?= []).push { date: +new Date, value: value }; paths["tasks.#{task.id}.history"] = true

    when 'daily'
      if cron
        calculateDelta()
        subtractPoints()
        task.streak = 0
      else
        calculateDelta()
        addPoints() # obviously for delta>0, but also a trick to undo accidental checkboxes
        if direction is 'up'
          streak = if streak then streak + 1 else 1
        else
          streak = if streak then streak - 1 else 0
        task.streak = streak
      paths["tasks.#{task.id}.streak"] = true

    when 'todo'
      if cron
        calculateDelta()
        #don't touch stats on cron
      else
        calculateDelta()
        addPoints() # obviously for delta>0, but also a trick to undo accidental checkboxes

    when 'reward'
    # Don't adjust values for rewards
      calculateDelta(false)
      # purchase item
      gp -= Math.abs(task.value)
      num = parseFloat(task.value).toFixed(2)
      # if too expensive, reduce health & zero gp
      if gp < 0
        hp += gp
        # hp - gp difference
        gp = 0

  task.value = value; paths["tasks.#{task.id}.value"] = true
  updateStats user, { hp, exp, gp }, {paths: paths}

  # Drop system #FIXME
  randomDrop(user, delta, priority, streak, {paths: paths}) if direction is 'up'

  return delta

###
  Updates user stats with new stats. Handles death, leveling up, etc
  {stats} new stats
  {update} if aggregated changes, pass in userObj as update. otherwise commits will be made immediately
###
updateStats = (user, newStats, options={}) ->
  paths = options.paths || {}
  # if user is dead, dont do anything
  return if user.stats.hp <= 0

  if newStats.hp?
    # Game Over
    if newStats.hp <= 0
      user.stats.hp = 0; paths['stats.hp'] = true # signifies dead
      return
    else
      user.stats.hp = newStats.hp; paths['stats.hp'] = true

  if newStats.exp?
    tnl = obj.tnl(user.stats.lvl)
    #silent = false
    # if we're at level 100, turn xp to gold
    if user.stats.lvl >= 100
      newStats.gp += newStats.exp / 15
      newStats.exp = 0
      user.stats.lvl = 100
    else
      # level up & carry-over exp
      if newStats.exp >= tnl
        #silent = true # push through the negative xp silently
        user.stats.exp = newStats.exp # push normal + notification
        while newStats.exp >= tnl and user.stats.lvl < 100 # keep levelling up
          newStats.exp -= tnl
          user.stats.lvl++
          tnl = obj.tnl(user.stats.lvl)
        if user.stats.lvl == 100
          newStats.exp = 0
        user.stats.hp = 50

    user.stats.exp = newStats.exp

    paths["stats.exp"]=true; paths['stats.lvl']=true; paths['stats.gp']=true; paths['stats.hp']=true;
    #if silent
    #console.log("pushing silent :"  + obj.stats.exp)


    # Set flags when they unlock features
    user.flags ?= {}
    if !user.flags.customizationsNotification and (user.stats.exp > 10 or user.stats.lvl > 1)
      user.flags.customizationsNotification = true; paths['flags.customizationsNotification']=true;
    if !user.flags.itemsEnabled and user.stats.lvl >= 2
      user.flags.itemsEnabled = true; paths['flags.itemsEnabled']=true;
    if !user.flags.partyEnabled and user.stats.lvl >= 3
      user.flags.partyEnabled = true; paths['flags.partyEnabled']=true;
    if !user.flags.dropsEnabled and user.stats.lvl >= 4
      user.flags.dropsEnabled = true; paths['flags.dropsEnabled']=true;

  if newStats.gp?
    #FIXME what was I doing here? I can't remember, gp isn't defined
    gp = 0.0 if (!gp? or gp < 0)
    user.stats.gp = newStats.gp

###
  At end of day, add value to all incomplete Daily & Todo tasks (further incentive)
  For incomplete Dailys, deduct experience
  Make sure to run this function once in a while as server will not take care of overnight calculations.
  And you have to run it every time client connects.
  {user}
###
obj.cron = (user, options={}) ->
  [paths, now] = [options.paths || {}, +options.now || +new Date]

  # New user (!lastCron, lastCron==new) or it got busted somehow, maybe they went to a different timezone
  if !user.lastCron? or user.lastCron is 'new' or moment(user.lastCron).isAfter(now)
    user.lastCron = now; paths['lastCron'] = true
    return

  daysMissed = helpers.daysBetween(user.lastCron, now, user.preferences?.dayStart)
  return unless daysMissed > 0

  user.lastCron = now; paths['lastCron'] = true

  # User is resting at the inn. Used to be we un-checked each daily without performing calculation (see commits before fb29e35)
  # but to prevent abusing the inn (http://goo.gl/GDb9x) we now do *not* calculate dailies, and simply set lastCron to today
  return if user.flags.rest is true

  # Tally each task
  todoTally = 0
  user.todos.concat(user.dailys).forEach (task) ->
    {id, type, completed, repeat} = task
    # Deduct experience for missed Daily tasks, but not for Todos (just increase todo's value)
    unless completed
      scheduleMisses = daysMissed
      # for dailys which have repeat dates, need to calculate how many they've missed according to their own schedule
      if (type is 'daily') and repeat
        scheduleMisses = 0
        _.times daysMissed, (n) ->
          thatDay = moment(now).subtract('days', n + 1)
          scheduleMisses++ if helpers.shouldDo(thatDay, repeat, {dayStart:obj.preferences?.dayStart})
      obj.score(user, task, 'down', {times:scheduleMisses, cron:true, paths:paths}) if scheduleMisses > 0

    switch type
      when 'daily'
        (task.history ?= []).push({ date: +new Date, value: task.value }); paths["tasks.#{task.id}.history"] = true
        task.completed = false; paths["tasks.#{task.id}.completed"] = true;
      when 'todo'
        #get updated value
        absVal = if (completed) then Math.abs(task.value) else task.value
        todoTally += absVal

  user.habits.forEach (task) -> # slowly reset 'onlies' value to 0
    if task.up is false or task.down is false
      if Math.abs(task.value) < 0.1
        task.value = 0
      else
        task.value = task.value / 2
      paths["tasks.#{task.id}.value"] = true


  # Finished tallying
  ((user.history ?= {}).todos ?= []).push { date: now, value: todoTally }
  # tally experience
  expTally = user.stats.exp
  lvl = 0 #iterator
  while lvl < (user.stats.lvl - 1)
    lvl++
    expTally += obj.tnl(lvl)
  (user.history.exp ?= []).push { date: now, value: expTally }
  paths["history"] = true
  user