-----------------------------------------------------------------------
-- Upvalued Lua API.
-----------------------------------------------------------------------
local _G = getfenv(0)

local pairs = _G.pairs
local tonumber = _G.tonumber

local bit = _G.bit
local math = _G.math
local table = _G.table


-----------------------------------------------------------------------
-- AddOn namespace.
-----------------------------------------------------------------------
local ADDON_NAME, private = ...

local LibStub = _G.LibStub
local WDP = LibStub("AceAddon-3.0"):NewAddon(ADDON_NAME, "AceEvent-3.0", "AceTimer-3.0")


-----------------------------------------------------------------------
-- Local constants.
-----------------------------------------------------------------------
local DATABASE_DEFAULTS = {
    global = {
        items = {},
        npcs = {},
        objects = {},
        quests = {},
    }
}


local EVENT_MAPPING = {
    --    ARTIFACT_COMPLETE = true,
    --    ARTIFACT_HISTORY_READY = true,
    --    AUCTION_HOUSE_SHOW = true,
    --    BANKFRAME_OPENED = true,
    --    BATTLEFIELDS_SHOW = true,
    --    CHAT_MSG_ADDON = true,
    --    CHAT_MSG_MONSTER_EMOTE = true,
    --    CHAT_MSG_MONSTER_SAY = true,
    --    CHAT_MSG_MONSTER_WHISPER = true,
    --    CHAT_MSG_MONSTER_YELL = true,
    --    CHAT_MSG_SYSTEM = true,
    --    COMBAT_LOG_EVENT_UNFILTERED = true,
    --    COMBAT_TEXT_UPDATE = true,
    --    CONFIRM_BINDER = true,
    --    CONFIRM_PET_UNLEARN = true,
    --    CONFIRM_TALENT_WIPE = true,
    --    CURRENCY_DISPLAY_UPDATE = true,
    --    GOSSIP_ENTER_CODE = true,
    --    GOSSIP_SHOW = true,
    --    ITEM_TEXT_BEGIN = true,
    --    LOCALPLAYER_PET_RENAMED = true,
    --    LOOT_CLOSED = true,
    LOOT_OPENED = true,
    --    MAIL_SHOW = true,
    --    MERCHANT_SHOW = true,
    --    MERCHANT_UPDATE = true,
    --    OPEN_TABARD_FRAME = true,
    --    PET_BAR_UPDATE = true,
    --    PET_STABLE_SHOW = true,
    --    PLAYER_ALIVE = true,
    --    PLAYER_ENTERING_WORLD = HandleZoneChange,
    --    PLAYER_LOGIN = true,
    --    PLAYER_LOGOUT = true,
    --    PLAYER_TARGET_CHANGED = true,
    --    QUEST_COMPLETE = true,
    --    QUEST_DETAIL = true,
    --    QUEST_LOG_UPDATE = true,
    --    QUEST_PROGRESS = true,
    --    TAXIMAP_OPENED = true,
    --    TRADE_SKILL_SHOW = true,
    --    TRADE_SKILL_UPDATE = true,
    --    TRAINER_SHOW = true,
    --    UNIT_QUEST_LOG_CHANGED = true,
    UNIT_SPELLCAST_FAILED = "HandleSpellFailure",
    UNIT_SPELLCAST_FAILED_QUIET = "HandleSpellFailure",
    UNIT_SPELLCAST_INTERRUPTED = "HandleSpellFailure",
    UNIT_SPELLCAST_SENT = true,
    UNIT_SPELLCAST_SUCCEEDED = true,
    --    ZONE_CHANGED = HandleZoneChange,
    --    ZONE_CHANGED_NEW_AREA = HandleZoneChange,
}

local AF = private.ACTION_TYPE_FLAGS

-----------------------------------------------------------------------
-- Local variables.
-----------------------------------------------------------------------
local db
local durability_timer_handle
local action_data = {}

do
    local UNIT_TYPE_BITMASK = 0x007

    function WDP:ParseGUID(guid)
        local types = private.UNIT_TYPES
        local unit_type = _G.bit.band(tonumber(guid:sub(1, 5)), UNIT_TYPE_BITMASK)

        if unit_type ~= types.PLAYER or unit_type ~= types.OBJECT or unit_type ~= types.PET then
            return unit_type, tonumber(guid:sub(-12, -9), 16)
        end

        return unit_type
    end
end -- do-block


-----------------------------------------------------------------------
-- Helper Functions.
-----------------------------------------------------------------------
local function CurrentLocationData()
    local map_level = _G.GetCurrentMapDungeonLevel() or 0
    local x, y = _G.GetPlayerMapPosition("player")

    x = x or 0
    y = y or 0

    if x == 0 and y == 0 then
        for level_index = 1, _G.GetNumDungeonMapLevels() do
            _G.SetDungeonMapLevel(level_index)
            x, y = _G.GetPlayerMapPosition("player")

            if x and y and (x > 0 or y > 0) then
                _G.SetDungeonMapLevel(map_level)
                map_level = level_index
                break
            end
        end
    end

    if _G.DungeonUsesTerrainMap() then
        map_level = map_level - 1
    end

    return _G.GetRealZoneText(), math.floor(x * 1000 + 0.5), math.floor(y * 1000 + 0.5), map_level or 0
end


local function ItemLinkToID(item_link)
    if not item_link then
        return
    end
    local id = item_link:match("item:(%d+)")
    return id and tonumber(id) or nil
end

-----------------------------------------------------------------------
-- Methods.
-----------------------------------------------------------------------
function WDP:OnInitialize()
    db = LibStub("AceDB-3.0"):New("WoWDBProfilerData", DATABASE_DEFAULTS, "Default").global
end


function WDP:OnEnable()
    for event_name, mapping in pairs(EVENT_MAPPING) do
        self:RegisterEvent(event_name, (_G.type(mapping) ~= "boolean") and mapping or nil)
    end
    durability_timer_handle = self:ScheduleRepeatingTimer("ProcessDurability", 30)
end


local function RecordDurability(item_id, durability)
    if not durability or durability <= 0 then
        return
    end

    if not db.items[item_id] then
        db.items[item_id] = {}
    end
    db.items[item_id].durability = durability
end


function WDP:ProcessDurability()
    for slot_index = 0, _G.INVSLOT_LAST_EQUIPPED do
        local item_id = _G.GetInventoryItemID("player", slot_index)

        if item_id and item_id > 0 then
            local _, max_durability = _G.GetInventoryItemDurability(slot_index)
            RecordDurability(item_id, max_durability)
        end
    end

    for bag_index = 0, _G.NUM_BAG_SLOTS do
        for slot_index = 1, _G.GetContainerNumSlots(bag_index) do
            local item_id = _G.GetContainerItemID(bag_index, slot_index)

            if item_id and item_id > 0 then
                local _, max_durability = _G.GetContainerItemDurability(bag_index, slot_index)
                RecordDurability(item_id, max_durability)
            end
        end
    end
end


-----------------------------------------------------------------------
-- Event handlers.
-----------------------------------------------------------------------
function WDP:CHAT_MSG_SYSTEM(event_name, message, sender_name, language)
end


local re_gold = _G.GOLD_AMOUNT:gsub("%%d", "(%%d+)")
local re_silver = _G.SILVER_AMOUNT:gsub("%%d", "(%%d+)")
local re_copper = _G.COPPER_AMOUNT:gsub("%%d", "(%%d+)")


local function _moneyMatch(money, re)
    return money:match(re) or 0
end


local function _toCopper(money)
    if not money then
        return 0
    end

    return _moneyMatch(money, re_gold) * 10000 + _moneyMatch(money, re_silver) * 100 + _moneyMatch(money, re_copper)
end


local LOOT_VERIFY_FUNCS = {
    [AF.NPC] = function()
        local fishing_loot = _G.IsFishingLoot()

        if not fishing_loot and _G.UnitExists("target") and not _G.UnitIsFriend("player", "target") and _G.UnitIsDead("target") then
            if _G.UnitIsPlayer("target") or _G.UnitPlayerControlled("target") then
                return false
            end
            local unit_type, id_num = WDP:ParseGUID(_G.UnitGUID("target"))
            action_data.id_num = id_num
        end
        return true
    end,
}

local LOOT_UPDATE_FUNCS = {
    [AF.NPC] = function()
        local npc = db.npcs[action_data.id_num]

        if not npc then
            db.npcs[action_data.id_num] = {}
            npc = db.npcs[action_data.id_num]
        end
        npc.drops = npc.drops or {}

        for index = 1, #action_data.drops do
            table.insert(npc.drops, action_data.drops[index])
        end
    end,
}


function WDP:LOOT_OPENED()
    if not action_data.type then
        action_data.type = AF.NPC
    end
    local verify_func = LOOT_VERIFY_FUNCS[action_data.type]
    local update_func =  LOOT_UPDATE_FUNCS[action_data.type]

    if not verify_func or not update_func or not verify_func() then
        return
    end

    local loot_registry = {}
    action_data.drops = {}

    for loot_slot = 1, _G.GetNumLootItems() do
        local texture, item, quantity, quality, locked = _G.GetLootSlotInfo(loot_slot)

        if _G.LootSlotIsItem(loot_slot) then
            local item_id = ItemLinkToID(_G.GetLootSlotLink(loot_slot))
            loot_registry[item_id] = (loot_registry[item_id]) or 0 + quantity
        elseif _G.LootSlotIsCoin(loot_slot) then
            table.insert(action_data.drops, ("money:%d"):format(_toCopper(item)))
        elseif _G.LootSlotIsCurrency(loot_slot) then
        end
    end

    for item_id, quantity in pairs(loot_registry) do
        table.insert(action_data.drops, ("%d:%d"):format(item_id, quantity))
    end
    update_func()
end


function WDP:UNIT_SPELLCAST_SENT(event_name, unit_id, spell_name, spell_rank, target_name, spell_line)
    if private.tracked_line or unit_id ~= "player" then
        return
    end
    local spell_label = private.SPELL_LABELS_BY_NAME[spell_name]

    if not spell_label then
        return
    end
    action_data.type = nil -- This will be set as appropriate below

    local tt_item_name, tt_item_link = _G.GameTooltip:GetItem()
    local tt_unit_name, tt_unit_id = _G.GameTooltip:GetUnit()

    if not tt_unit_name and _G.UnitName("target") == target_name then
        tt_unit_name = target_name
        tt_unit_id = "target"
    end
    local spell_flags = private.SPELL_FLAGS_BY_LABEL[spell_label]

    if not tt_item_name and not tt_unit_name then
        if target_name == "" then
            return
        end

        local zone_name, x, y, map_level = CurrentLocationData()

        if bit.band(spell_flags, AF.OBJECT) == AF.OBJECT then
            action_data.map_level = map_level
            action_data.name = target_name
            action_data.type = AF.OBJECT
            action_data.x = x
            action_data.y = y
            action_data.zone = zone_name
            print("Found spell flagged for OBJECT")
        elseif bit.band(spell_flags, AF.ZONE) == AF.ZONE then
            print("Found spell flagged for ZONE")
        end
    elseif tt_unit_name and not tt_item_name then
        if bit.band(spell_flags, AF.NPC) == AF.NPC then
            print("Found spell flagged for NPC")
        end
    elseif bit.band(spell_flags, AF.ITEM) == AF.ITEM then
        print("Found spell flagged for ITEM")
    else
        print(("%s: We have an issue with types and flags."), event_name)
    end

    print(("%s: '%s', '%s', '%s', '%s', '%s'"):format(event_name, unit_id, spell_name, spell_rank, target_name, spell_line))
    private.tracked_line = spell_line
end


function WDP:UNIT_SPELLCAST_SUCCEEDED(event_name, unit_id, spell_name, spell_rank, spell_line, spell_id)
    if unit_id ~= "player" then
        return
    end

    if action_data.type == AF.OBJECT then
    end

    if private.SPELL_LABELS_BY_NAME[spell_name] then
        print(("%s: '%s', '%s', '%s', '%s', '%s'"):format(event_name, unit_id, spell_name, spell_rank, spell_line, spell_id))
    end
    private.tracked_line = nil
end

function WDP:HandleSpellFailure(event_name, unit_id, spell_name, spell_rank, spell_line, spell_id)
    if unit_id ~= "player" then
        return
    end

    if private.tracked_line == spell_line then
        private.tracked_line = nil
    end
end