--[[
    Copyright (c) 2010 yaroot(@gmail.com)

    Permission is hereby granted, free of charge, to any person
    obtaining a copy of this software and associated documentation
    files (the "Software"), to deal in the Software without
    restriction, including without limitation the rights to use,
    copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following
    conditions:

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
    OTHER DEALINGS IN THE SOFTWARE.
--]]

local _, ns = ...
local oUF = ns.oUF or oUF
assert(oUF, 'oUF RaidDebuffs: unable to locate oUF')

local DispelColor = {
    ['Magic']   = {.2, .6, 1},
    ['Curse']   = {.6, 0, 1},
    ['Disease'] = {.6, .4, 0},
    ['Poison']  = {0, .6, 0},
    ['none'] = {0, 0, 0},
}

local DispelPriority = {
    ['Magic']   = 4,
    ['Curse']   = 3,
    ['Disease'] = 2,
    ['Poison']  = 1,
}

local DispelFilter = ({
    PIREST = {
        Magic = true,
        Disease = true,
    },
    SHAMAN = {
        --Magic = true,
        Curse = true,
    },
    PALADIN = {
        --Magic = false,
        Poison = true,
        Disease = true,
    },
    MAGE = {
        Curse = true,
    },
    DRUID = {
        --Magic = true,
        Curse = true,
        Poison = true,
    },
})[select(2, UnitClass'player')]

local function formatTime(s)
    if s > 60 then
        return format('%dm', s/60), s%60
    else
        return format('%d', s), s - floor(s)
    end
end

local function OnUpdate(self, elps)
    self.nextUpdate = self.nextUpdate - elps
    if self.nextUpdate > 0 then return end

    local timeLeft = self.endTime - GetTime()
    if timeLeft > 0 then
        local text, nextUpdate = formatTime(timeLeft)
        self.time:SetText(text)
        self.nextUpdate = nextUpdate
    else
        self:SetScript('OnUpdate', nil)
        self.time:Hide()
    end
end

local function UpdateDebuff(self, name, icon, count, debuffType, duration, endTime)
    local rd = self.RaidDebuffs
    if name then
        rd.icon:SetTexture(icon)
        rd.icon:Show()

        if rd.count then
            if count and (count > 0) then
                rd.count:SetText(count)
                rd.count:Show()
            else
                rd.count:Hide()
            end
        end

        if rd.time then
            if duration and (duration > 0) then
                rd.endTime = endTime
                rd.nextUpdate = 0
                rd:SetScript('OnUpdate', OnUpdate)
                rd.time:Show()
            else
                rd:SetScript('OnUpdate', nil)
                rd.time:Hide()
            end
        end

        if rd.cd then
            if duration and (duration > 0) then
                rd.cd:SetCooldown(endTime - duration, duration)
                rd.cd:Show()
            else
                rd.cd:Hide()
            end
        end

        if(rd.SetBackdropColor) then
            local dispelColor = rd.DispelColor or DispelColor
            local c = dispelColor[debuffType] or dispelColor.none
            rd:SetBackdropColor(unpack(c or DispelColor.none))
        end

        rd:Show()
    else
        rd:Hide()
    end
end

local function Update(self, event, unit)
    if unit ~= self.unit then return end
    local rd = self.RaidDebuffs
    local _name, _icon, _count, _dtype, _duration, _endTime
    local _priority = 0
    local i = 0
    while(true) do
        i = i + 1
        local name, rank, icon, count, debuffType, duration, expirationTime, unitCaster, isStealable, shouldConsolidate, spellId = UnitAura(unit, i, rd.Filter or 'HARMFUL')
        if (not name) then break end
        local priority

        if rd.ShowDispelableDebuff and debuffType then
            local dispelPriority = rd.DispelPriority or DispelPriority
            if rd.FilterDispelableDebuff then
                priority = (rd.DispelFilter or DispelFilter)[debuffType] and DispelPriority[debuffType]
            else
                priority = DispelPriority[debuffType]
            end

            if priority and (priority > _priority) then
                _priority, _name, _icon, _count, _dtype, _duration, _endTime = priority, name, icon, count, debuffType, duration, expirationTime
            end
        end

        priority = rd.Debuffs and rd.Debuffs[rd.MatchBySpellName and name or spellId]
        if priority and (priority > _priority) then
            _priority, _name, _icon, _count, _dtype, _duration, _endTime = priority, name, icon, count, debuffType, duration, expirationTime
        end
    end

    UpdateDebuff(self, _name, _icon, _count, _dtype, _duration, _endTime)
end

local f

local function searchFor(spell, i)
    local spellName = GetSpellInfo(spell)
    local found
    for j = 1, GetNumSpellTabs() do
        for k = 1, GetNumTalents(j) do
            local talentName, _, _, _, rank = GetTalentInfo(j, k)
            if(talentName and talentName == spellName) then
                return true
            end
        end
    end
end

local function spellCheck()
    local _, class = UnitClass'player'
    if(class == 'PALADIN') then
        -- http://www.wowhead.com/spell=53551
        -- Sacred Cleansing
        DispelFilter.Magic = searchFor(53551)
    elseif(class == 'SHAMAN') then
        -- http://www.wowhead.com/spell=77130
        -- Improved Cleanse Spirit
        DispelFilter.Magic = searchFor(77130)
    elseif(class == 'DRUID') then
        -- http://www.wowhead.com/spell=88423
        -- Nature's Cure
        DispelFilter.Magic = searchFor(88423)
    end
end

local Path = function(self, ...)
    return (self.RaidDebuffs.Override or Update) (self, ...)
end

local ForceUpdate = function(element)
    return Path(element.__owner, 'ForceUpdate', element.__owner.unit)
end

local Enable = function(self)
    local rd = self.RaidDebuffs
    if(rd) then
        self:RegisterEvent('UNIT_AURA', Path)
        rd.ForceUpdate = ForceUpdate

        if(not f and not rd.DispelFilter and not rd.Override) then
            f = CreateFrame'Frame'
            f:SetScript('OnEvent', spellCheck)
            f:RegisterEvent('PLAYER_TALENT_UPDATE')
            f:RegisterEvent('CHARACTER_POINTS_CHANGED')
            spellCheck()
        end

        return true
    end
end

local Disable = function(self)
    if self.RaidDebuffs then
        self:UnregisterEvent('UNIT_AURA', Path)
        self.RaidDebuffs:Hide()
    end
end

oUF:AddElement('RaidDebuffs', Update, Enable, Disable)