pfUI.api = { }
pfUI.api._G = getfenv(0)
local _G = getfenv(0)
-- [ strsplit ]
-- Splits a string using a delimiter.
-- 'delimiter'  [string]        characters that will be interpreted as delimiter
--                              characters (bytes) in the string.
-- 'subject'    [string]        String to split.
-- return:      [list]          a list of strings.
function pfUI.api.strsplit(delimiter, subject)
  local delimiter, fields = delimiter or ":", {}
  local pattern = string.format("([^%s]+)", delimiter)
  string.gsub(subject, pattern, function(c) fields[table.getn(fields)+1] = c end)
  return unpack(fields)
end

-- [ strvertical ]
-- Creates vertical text using linebreaks. Multibyte char friendly.
-- 'str'        [string]        String to columnize.
-- return:      [string]        the string tranformed to a column.
function pfUI.api.strvertical(str)
    local _, len = string.gsub(str,"[^\128-\193]", "")
    if (len == string.len(str)) then
      return string.gsub(str, "(.)", "%1\n")
    else
      return string.gsub(str,"([%z\1-\127\194-\244][\128-\191]*)", "%1\n")
    end
end

-- [ round ]
-- Rounds a float number into specified places after comma.
-- 'input'      [float]         the number that should be rounded.
-- 'places'     [int]           amount of places after the comma.
-- returns:     [float]         rounded number.
function pfUI.api.round(input, places)
  if not places then places = 0 end
  if type(input) == "number" and type(places) == "number" then
    local pow = 1
    for i = 1, places do pow = pow * 10 end
    return floor(input * pow + 0.5) / pow
  end
end

-- [ GetItemLinkByName ]
-- Returns an itemLink for the given itemname
-- 'name'       [string]         name of the item
-- returns:     [string]         entire itemLink for the given item
function pfUI.api.GetItemLinkByName(name)
  for itemID = 1, 25818 do
    local itemName, hyperLink, itemQuality = GetItemInfo(itemID)
    if (itemName and itemName == name) then
      local _, _, _, hex = GetItemQualityColor(tonumber(itemQuality))
      return hex.. "|H"..hyperLink.."|h["..itemName.."]|h|r"
    end
  end
end

-- [ hooksecurefunc ]
-- Hooks a global function and injects custom code
-- 'name'       [string]           name of the function that shold be hooked
-- 'func'       [function]         function containing the custom code
-- 'append'     [bool]             optional variable, used to append custom
--                                 code instead of prepending it
function pfUI.api.hooksecurefunc(name, func, append)
  if not _G[name] then return end

  pfUI.hooks[tostring(func)] = {}
  pfUI.hooks[tostring(func)]["old"] = _G[name]
  pfUI.hooks[tostring(func)]["new"] = func

  if append then
    pfUI.hooks[tostring(func)]["function"] = function(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
      pfUI.hooks[tostring(func)]["old"](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
      pfUI.hooks[tostring(func)]["new"](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
    end
  else
    pfUI.hooks[tostring(func)]["function"] = function(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
      pfUI.hooks[tostring(func)]["new"](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
      pfUI.hooks[tostring(func)]["old"](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10)
    end
  end

  _G[name] = pfUI.hooks[tostring(func)]["function"]
end

-- [ Create Gold String ]
-- Transforms a amount of copper into a fully fledged gold string
-- 'money'      [int]           the amount of coppy (GetMoney())
-- return:      [string]        a colorized string which is split into
--                              gold,silver and copper values.
function pfUI.api.CreateGoldString(money)
  local gold = floor(money/ 100 / 100)
  local silver = floor(mod((money/100),100))
  local copper = floor(mod(money,100))

  local string = ""
  if gold > 0 then string = string .. "|cffffffff" .. gold .. "|cffffd700g" end
  if silver > 0 then string = string .. "|cffffffff " .. silver .. "|cffc7c7cfs" end
  string = string .. "|cffffffff " .. copper .. "|cffeda55fc"

  return string
end

-- [ Enable Movable ]
-- Set all necessary functions to make a already existing frame movable.
-- 'name'       [string]        Name of the Frame that should be movable
-- 'addon'      [string]        Addon that must be loaded before being able to access the frame
-- 'blacklist'  [table]         A list of frames that should be deactivated for mouse usage
function pfUI.api.EnableMovable(name, addon, blacklist)
  if addon then
    local scan = CreateFrame("Frame")
    scan:RegisterEvent("ADDON_LOADED")
    scan:SetScript("OnEvent", function()
      if arg1 == addon then
        local frame = _G[name]

        if blacklist then
          for _, disable in pairs(blacklist) do
            _G[disable]:EnableMouse(false)
          end
        end

        frame:SetMovable(true)
        frame:EnableMouse(true)
        frame:SetScript("OnMouseDown",function()
          this:StartMoving()
        end)

        frame:SetScript("OnMouseUp",function()
          this:StopMovingOrSizing()
        end)
        this:UnregisterAllEvents()
      end
    end)
  else
    if blacklist then
      for _, disable in pairs(blacklist) do
        _G[disable]:EnableMouse(false)
      end
    end

    local frame = _G[name]
    frame:SetMovable(true)
    frame:EnableMouse(true)
    frame:SetScript("OnMouseDown",function()
      this:StartMoving()
    end)

    frame:SetScript("OnMouseUp",function()
      this:StopMovingOrSizing()
    end)
  end
end

-- [ Copy Table ]
-- By default a table assignment only will be a reference instead of a copy.
-- This is used to create a replicate of the actual table.
-- 'src'        [table]        the table that should be copied.
-- return:      [table]        the replicated table.
function pfUI.api.CopyTable(src)
  local lookup_table = {}
  local function _copy(src)
    if type(src) ~= "table" then
      return src
    elseif lookup_table[src] then
      return lookup_table[src]
    end
    local new_table = {}
    lookup_table[src] = new_table
    for index, value in pairs(src) do
      new_table[_copy(index)] = _copy(value)
    end
    return setmetatable(new_table, getmetatable(src))
  end
  return _copy(src)
end

-- [ Update Movable ]
-- Loads and update the configured position of the specified frame.
-- It also creates an entry in the movables table.
-- 'frame'      [frame]        the frame that should be updated.
function pfUI.api.UpdateMovable(frame)
  local name = frame:GetName()

  if pfUI_config.global.offscreen == "0" then
    frame:SetClampedToScreen(true)
  end

  if not pfUI.movables[name] then
    pfUI.movables[name] = true
    table.insert(pfUI.movables, name)
  end

  if pfUI_config["position"][frame:GetName()] then
    if pfUI_config["position"][frame:GetName()]["scale"] then
      frame:SetScale(pfUI_config["position"][frame:GetName()].scale)
    end

    if pfUI_config["position"][frame:GetName()]["xpos"] then
      frame:ClearAllPoints()
      frame:SetPoint("TOPLEFT", pfUI_config["position"][frame:GetName()].xpos, pfUI_config["position"][frame:GetName()].ypos)
    end
  end
end


-- [ SetAutoPoint ]
-- Automatically places the frame according to screen position of the parent.
-- 'frame'      [frame]        the frame that should be moved.
-- 'parent'     [frame]        the frame's anchor point
-- 'spacing'    [number]       the padding that should be used between the
--                             frame and its parent frame
function pfUI.api.SetAutoPoint(frame, parent, spacing)
  --[[

          a     b       max
    +-----------------+
    |  1  |  2  |  3  |
    |-----+-----+-----| c
    |  4  |  5  |  6  |
    |-----+-----+-----| d
    |  7  |  8  |  9  |
    +-----------------+
  0

  ]]--

  local a = GetScreenWidth() / 3
  local b = GetScreenWidth() / 3 * 2

  local c = GetScreenHeight() / 3 * 2
  local d = GetScreenHeight() / 3

  local x, y = parent:GetCenter()

  local off = spacing or 0

  frame:ClearAllPoints()

  if x < a and y > c then
    -- TOPLEFT
    frame:SetPoint("TOPLEFT", parent, "BOTTOMLEFT", 0, -off)
  elseif x > a and x < b and y > c then
    -- TOP
    frame:SetPoint("TOP", parent, "BOTTOM", 0, -off)
  elseif x > b and y > c then
    -- TOPRIGHT
    frame:SetPoint("TOPRIGHT", parent, "BOTTOMRIGHT", 0, -off)

  elseif x < a and y > d and y < c then
    -- LEFT
    frame:SetPoint("LEFT", parent, "RIGHT", off, 0)

  elseif x > a and x < b and y > d and y < c then
    -- CENTER
    frame:SetPoint("BOTTOM", parent, "TOP", 0, off)

  elseif x > b and y > d and y < c then
    -- RIGHT
    frame:SetPoint("RIGHT", parent, "LEFT", -off, 0)

  elseif x < a and y < d then
    -- BOTTOMLEFT
    frame:SetPoint("BOTTOMLEFT", parent, "TOPLEFT", 0, off)

  elseif x > a and x < b and y < d then
    -- BOTTOM
    frame:SetPoint("BOTTOM", parent, "TOP", 0, off)

  elseif x > b and y < d then
    -- BOTTOMRIGHT
    frame:SetPoint("BOTTOMRIGHT", parent, "TOPRIGHT", 0, off)
  end
end

-- [ Create Backdrop ]
-- Creates a pfUI compatible frame as backdrop element
-- 'f'          [frame]         the frame which should get a backdrop.
-- 'inset'      [int]           backdrop inset, defaults to border size.
-- 'legacy'     [bool]          use legacy backdrop instead of creating frames.
-- 'transp'     [bool]          force default transparency of 0.8.
function pfUI.api.CreateBackdrop(f, inset, legacy, transp)
  -- use default inset if nothing is given
  local border = inset
  if not border then
    border = tonumber(pfUI_config.appearance.border.default)
  end

  -- bg and edge colors
  if not pfUI.cache.br then
    local br, bg, bb, ba = pfUI.api.strsplit(",", pfUI_config.appearance.border.background)
    local er, eg, eb, ea = pfUI.api.strsplit(",", pfUI_config.appearance.border.color)
    pfUI.cache.br, pfUI.cache.bg, pfUI.cache.bb, pfUI.cache.ba = br, bg, bb, ba
    pfUI.cache.er, pfUI.cache.eg, pfUI.cache.eb, pfUI.cache.ea = er, eg, eb, ea
  end

  local br, bg, bb, ba =  pfUI.cache.br, pfUI.cache.bg, pfUI.cache.bb, pfUI.cache.ba
  local er, eg, eb, ea = pfUI.cache.er, pfUI.cache.eg, pfUI.cache.eb, pfUI.cache.ea
  if transp then ba = transp end

  -- use legacy backdrop handling
  if legacy then
    f:SetBackdrop(pfUI.backdrop)
    f:SetBackdropColor(br, bg, bb, ba)
    f:SetBackdropBorderColor(er, eg, eb , ea)
    return
  end

  -- increase clickable area if available
  if f.SetHitRectInsets then
    f:SetHitRectInsets(-border,-border,-border,-border)
  end

  -- use new backdrop behaviour
  if not f.backdrop then
    f:SetBackdrop(nil)

    local border = tonumber(border) - 1
    local backdrop = pfUI.backdrop
    if border < 1 then backdrop = pfUI.backdrop_small end
  	local b = CreateFrame("Frame", nil, f)
  	b:SetPoint("TOPLEFT", f, "TOPLEFT", -border, border)
  	b:SetPoint("BOTTOMRIGHT", f, "BOTTOMRIGHT", border, -border)

    local level = f:GetFrameLevel()
    if level < 1 then
  	  --f:SetFrameLevel(level + 1)
      b:SetFrameLevel(level)
    else
      b:SetFrameLevel(level - 1)
    end

    f.backdrop = b
    b:SetBackdrop(backdrop)
  end

  local b = f.backdrop
  b:SetBackdropColor(br, bg, bb, ba)
  b:SetBackdropBorderColor(er, eg, eb , ea)
end

-- [ Skin Button ]
-- Applies pfUI skin to buttons:
-- 'button'     [frame/string]  the button that should be skinned.
-- 'cr'         [int]           mouseover color (red), defaults to classcolor.
-- 'cg'         [int]           mouseover color (green), defaults to classcolor.
-- 'cb'         [int]           mouseover color (blue), defaults to classcolor.
function pfUI.api.SkinButton(button, cr, cg, cb)
  local b = getglobal(button)
  if not b then b = button end
  if not cr or not cg or not cb then
    _, class = UnitClass("player")
    local color = RAID_CLASS_COLORS[class]
    cr, cg, cb = color.r , color.g, color.b
  end
  pfUI.api.CreateBackdrop(b, nil, true)
  b:SetNormalTexture(nil)
  b:SetHighlightTexture(nil)
  b:SetPushedTexture(nil)
  b:SetDisabledTexture(nil)
  local funce = b:GetScript("OnEnter")
  local funcl = b:GetScript("OnLeave")
  b:SetScript("OnEnter", function()
    if funce then funce() end
    pfUI.api.CreateBackdrop(b, nil, true)
    b:SetBackdropBorderColor(cr,cg,cb,1)
  end)
  b:SetScript("OnLeave", function()
    if funcl then funcl() end
    pfUI.api.CreateBackdrop(b, nil, true)
  end)
  b:SetFont(pfUI.font_default, pfUI_config.global.font_size, "OUTLINE")
end

-- [ Question Dialog ]
-- Creates a pfUI user dialog popup:
-- 'text'       [string]        text that will be displayed.
-- 'yes'        [function]      function that is triggered on 'Okay' button.
-- 'no'         [function]      function that is triggered on 'Cancel' button.
-- 'editbox'    [bool]          if set, a inputfield will be shown. it can be.
--                              accessed with "GetParent().input".
function pfUI.api.CreateQuestionDialog(text, yes, no, editbox)
  -- do not allow multiple instances of question dialogs
  if pfQuestionDialog and pfQuestionDialog:IsShown() then
    pfQuestionDialog:Hide()
    pfQuestionDialog = nil
    return
  end

  local yes, no = yes, no
  local yescap, nocap = "Yes", "No"

  if yes and type(yes) == "table" then
    yescap = yes[1]
    yes = yes[2]
  end

  if no and type(no) == "table" then
    nocap = no[1]
    no = no[2]
  end

  if not text then text = "Are you sure?" end

  local border = tonumber(pfUI_config.appearance.border.default)
  local padding = 15

  -- frame
  local question = CreateFrame("Frame", "pfQuestionDialog", UIParent)
  question:ClearAllPoints()
  question:SetPoint("CENTER", 0, 0)
  question:SetFrameStrata("TOOLTIP")
  question:SetMovable(true)
  question:EnableMouse(true)
  question:SetScript("OnMouseDown",function()
    this:StartMoving()
  end)

  question:SetScript("OnMouseUp",function()
    this:StopMovingOrSizing()
  end)
  pfUI.api.CreateBackdrop(question, nil, nil, .85)

  -- text
  question.text = question:CreateFontString("Status", "LOW", "GameFontNormal")
  question.text:SetFontObject(GameFontWhite)
  question.text:SetPoint("TOPLEFT", question, "TOPLEFT", padding, -padding)
  question.text:SetPoint("TOPRIGHT", question, "TOPRIGHT", -padding, -padding)
  question.text:SetText(text)

  -- editbox
  if editbox then
    question.input = CreateFrame("EditBox", "pfQuestionDialogEdit", question)
    pfUI.api.CreateBackdrop(question.input)
    question.input:SetTextColor(.2,1,.8,1)
    question.input:SetJustifyH("CENTER")
    question.input:SetAutoFocus(false)
    question.input:SetPoint("TOPLEFT", question.text, "BOTTOMLEFT", border, -padding)
    question.input:SetPoint("TOPRIGHT", question.text, "BOTTOMRIGHT", -border, -padding)
    question.input:SetHeight(20)

    question.input:SetFontObject(GameFontNormal)
    question.input:SetScript("OnEscapePressed", function() this:ClearFocus() end)
  end

  -- buttons
  question.yes = CreateFrame("Button", "pfQuestionDialogYes", question, "UIPanelButtonTemplate")
  pfUI.api.SkinButton(question.yes)
  question.yes:SetWidth(100)
  question.yes:SetHeight(22)
  question.yes:SetText(yescap)
  question.yes:SetScript("OnClick", function()
    if yes then yes() end
    this:GetParent():Hide()
  end)

  if question.input then
    question.yes:SetPoint("TOPRIGHT", question.input, "BOTTOM", -3*border, -padding)
  else
    question.yes:SetPoint("TOPRIGHT", question.text, "BOTTOM", -3*border, -padding)
  end

  question.no = CreateFrame("Button", "pfQuestionDialogNo", question, "UIPanelButtonTemplate")
  pfUI.api.SkinButton(question.no)
  question.no:SetWidth(100)
  question.no:SetHeight(22)
  question.no:SetText(nocap)
  question.no:SetScript("OnClick", function()
    if no then no() end
    this:GetParent():Hide()
  end)

  if question.input then
    question.no:SetPoint("TOPLEFT", question.input, "BOTTOM", 3*border, -padding)
  else
    question.no:SetPoint("TOPLEFT", question.text, "BOTTOM", 3*border, -padding)
  end

  question.close = CreateFrame("Button", "pfQuestionDialogClose", question)
  question.close:SetPoint("TOPRIGHT", -border, -border)
  pfUI.api.CreateBackdrop(question.close)
  question.close:SetHeight(10)
  question.close:SetWidth(10)
  question.close.texture = question.close:CreateTexture("pfQuestionDialogCloseTex")
  question.close.texture:SetTexture("Interface\\AddOns\\pfUI\\img\\close")
  question.close.texture:ClearAllPoints()
  question.close.texture:SetAllPoints(question.close)
  question.close.texture:SetVertexColor(1,.25,.25,1)
  question.close:SetScript("OnEnter", function ()
    this.backdrop:SetBackdropBorderColor(1,.25,.25,1)
  end)

  question.close:SetScript("OnLeave", function ()
    pfUI.api.CreateBackdrop(this)
  end)

  question.close:SetScript("OnClick", function()
   this:GetParent():Hide()
  end)

  -- resize window
  local textspace = question.text:GetHeight() + padding
  local inputspace = 0
  if question.input then inputspace = question.input:GetHeight() + padding end
  local buttonspace = question.no:GetHeight() + padding
  question:SetHeight(textspace + inputspace + buttonspace + padding)

  local width = 200
  if question.text:GetStringWidth() > 200 then width = question.text:GetStringWidth() end
  question:SetWidth( width + 2*padding)
end

-- [ Bar Layout Options ] --
-- 'barsize'  size of bar in number of buttons
-- returns:   array of options as strings for pfUI.gui.bar
function pfUI.api.BarLayoutOptions(barsize)
  assert(barsize > 0 and barsize <= NUM_ACTIONBAR_BUTTONS,"BarLayoutOptions: barsize "..tostring(barsize).." is invalid")
  local options = {}
  for i,layout in ipairs(pfGridmath[barsize]) do
    options[i] = string.format("%d x %d",layout[1],layout[2])
  end
  return options
end

-- [ Bar Layout Formfactor ] --
-- 'option'  string option as used in pfUI_config.bars[bar].option
-- returns:  integer formfactor
local formfactors = {} -- we'll use memoization so we only compute once, then lookup.
setmetatable(formfactors, {__mode = "v"}) -- weak table so values not referenced are collected on next gc
function pfUI.api.BarLayoutFormfactor(option)
  if formfactors[option] then
    return formfactors[option]
  else
    for barsize,_ in ipairs(pfGridmath) do
      local options = pfUI.api.BarLayoutOptions(barsize)
      for i,opt in ipairs(options) do
        if opt == option then
          formfactors[option] = i
          return formfactors[option]
        end
      end
    end
  end
end

-- [ Bar Layout Size ] --
-- 'bar'  frame reference,
-- 'barsize'  integer number of buttons,
-- 'formfactor'  string formfactor in cols x rows
function pfUI.api.BarLayoutSize(bar,barsize,formfactor,iconsize,bordersize)
  assert(barsize > 0 and barsize <= NUM_ACTIONBAR_BUTTONS,"BarLayoutSize: barsize "..tostring(barsize).." is invalid")
  local formfactor = pfUI.api.BarLayoutFormfactor(formfactor)
  local cols, rows = unpack(pfGridmath[barsize][formfactor])
  local width = (iconsize + bordersize*3) * cols - bordersize
  local height = (iconsize + bordersize*3) * rows - bordersize
  bar._size = {width,height}
  return bar._size
end

-- [ Bar Button Anchor ] --
-- 'button'  frame reference
-- 'basename'  name of button frame without index
-- 'buttonindex'  index number of button on bar
-- 'formfactor'  string formfactor in cols x rows
function pfUI.api.BarButtonAnchor(button,basename,buttonindex,barsize,formfactor,iconsize,bordersize)
  assert(barsize > 0 and barsize <= NUM_ACTIONBAR_BUTTONS,"BarButtonAnchor: barsize "..tostring(barsize).." is invalid")
  local formfactor = pfUI.api.BarLayoutFormfactor(formfactor)
  local parent = button:GetParent()
  local cols, rows = unpack(pfGridmath[barsize][formfactor])
  if buttonindex == 1 then
    button._anchor = {"TOPLEFT", parent, "TOPLEFT", bordersize, -bordersize}
  else
    local col = buttonindex-((math.ceil(buttonindex/cols)-1)*cols)
    button._anchor = col==1 and {"TOP",getglobal(basename..(buttonindex-cols)),"BOTTOM",0,-(bordersize*3)} or {"LEFT",getglobal(basename..(buttonindex-1)),"RIGHT",(bordersize*3),0}
  end
  return button._anchor
end

-- [ Create Autohide ] --
-- 'frame'  the frame that should be hidden
function pfUI.api.CreateAutohide(frame)
  if not frame then return end
  frame.hover = CreateFrame("Frame", frame:GetName() .. "Autohide", frame)
  frame.hover:SetParent(frame)
  frame.hover:SetAllPoints(frame)
  frame.hover.parent = frame

  frame.hover:RegisterEvent("PLAYER_LEAVING_WORLD")
  frame.hover:SetScript("OnEvent", function()
    this:Hide()
  end)

  frame.hover:SetScript("OnUpdate", function()
    if MouseIsOver(this, 10, -10, -10, 10) then
      this.activeTo = GetTime() + tonumber(pfUI_config.bars.hide_time)
      this.parent:SetAlpha(1)
    elseif this.activeTo then
      if this.activeTo < GetTime() and this.parent:GetAlpha() > 0 then
        this.parent:SetAlpha(this.parent:GetAlpha() - 0.1)
      end
    else
      this.activeTo = GetTime() + tonumber(pfUI_config.bars.hide_time)
    end
  end)
end