---@type GL
local _, GL = ...;

---@type TMB
local TMB = GL.TMB;

---@class DroppedLoot
GL.DroppedLoot = {
    Announced = {},
    initialized = false,
    ButtonsHooked = {},
    allButtonsHooked = false,
    LootButtonItemLinkCache = {},
    LootChangedTimer = nil,
    lootWindowIsOpened = false,
};

local Constants = GL.Data.Constants; ---@type Data
local DroppedLoot = GL.DroppedLoot; ---@type DroppedLoot
local Events = GL.Events; ---@type Events
local SoftRes = GL.SoftRes; ---@type SoftRes
local LCG = LibStub("LibCustomGlowGargul-1.0");

---@return boolean
function DroppedLoot:_init()
    GL:debug("DroppedLoot:_init");

    -- No need to initialize this class twice
    if (self._initialized) then
        return false;
    end

    -- Fire DroppedLoot:lootReady every time a loot window is opened
    Events:register("DroppedLootLootOpenedListener", "LOOT_READY", function () self:lootReady(); end);

    -- Show a reminder window to use Gargul when trying to assign using native loot assignment
    Events:register("DroppedLootOpenMasterLooterListListener", "OPEN_MASTER_LOOT_LIST", function ()
        if (GL.User.isMasterLooter
            and GL.Settings:get("ExportingLoot.showLootAssignmentReminder")
            and TMB:available()
        ) then
            GL.Interface.ReminderToAssignLootUsingGargul:draw();
        end
    end);

    MasterLooterFrame:HookScript("OnHide", function()
        GL.Interface.ReminderToAssignLootUsingGargul:close();
    end);

    -- Make sure to keep track of the loot window status
    Events:register("DroppedLootLootClosedListener", "LOOT_CLOSED", function ()
        DroppedLoot.lootWindowIsOpened = false;

        GL.Interface.ShortcutKeysLegend:close();
    end);

    -- Remove highlight on loot buttons when closing the loot window
    Events:register("DroppedLootLootClosedHighlighterListener", "LOOT_CLOSED",
        function ()
            self:removeHighlights();
            self.DroppedLoot.LootButtonItemLinkCache = {};
        end
    );

    -- Highlight items that are soft-reserved or have TMB details
    Events:register("DroppedLootLootSlotChangedHighlighterListener", "GL.LOOT_CHANGED", function () self:highlightItemsOfInterest() end);

    self._initialized = true;
    return true;
end

--- Fired when a loot window is opened
---
---@return void
function DroppedLoot:lootReady()
    GL:debug("DroppedLoot:lootReady");

    self.lootWindowIsOpened = true;

    self:lootChanged();
    Events:fire("GL.LOOT_CHANGED");

    -- Periodically check if the loot changed because the internal WoW events are not
    -- comprehensive enough to detect things like the player moving to the next page of items.
    if (not self.LootChangedTimer) then
        GL:debug("Schedule new DroppedLoot.LootChangedTimer");
        self.LootChangedTimer = GL.Ace:ScheduleRepeatingTimer(function ()
            GL:debug("Run DroppedLoot.LootChangedTimer");
            if (self:lootChanged()) then
                Events:fire("GL.LOOT_CHANGED");
            end

            if (not self.lootWindowIsOpened
                and self.LootChangedTimer
            ) then
                GL:debug("Cancel DroppedLoot.LootChangedTimer");
                GL.Ace:CancelTimer(self.LootChangedTimer);
                self.LootChangedTimer = nil;
            end
        end, .1);
    end

    -- Only announce loot in chat if the setting is enabled
    if (GL.User.isMasterLooter
        and GL.Settings:get("DroppedLoot.announceLootToChat")
    ) then
        self:announce();
    end

    if (GL.User.isMasterLooter
        and GL.Settings:get("ShortcutKeys.showLegend", true)
    ) then
        GL.Ace:ScheduleTimer(function ()
            if (self.lootWindowIsOpened) then
                GL.Interface.ShortcutKeysLegend:draw();
            end
        end, 1);
    end

    -- Let the rest of the application know we're done announcing the items
    GL.Events:fire("GL.LOOT_ANNOUNCED");

    -- We need to delay the hooking of click events because some add-ons
    -- are slow when it comes to adding their custom buttons (looking at you XLoot)
    GL.Ace:ScheduleTimer(function ()
        self:hookClickEvents();
    end, .4);
end

-- Check whether the loot in the loot window changed in any way e.g:
-- An item was taken from the window
-- The player navigated to a different page in the loot window
function DroppedLoot:lootChanged()
    local lootChanged = false;
    for buttonIndex = 1, _G.LOOTFRAME_NUMBUTTONS do
        local buttonName = "LootButton" .. buttonIndex;
        local Button = getglobal("LootButton" .. buttonIndex);
        local itemLink = "";

        if (Button
            and Button:IsVisible()
            and Button.slot
        ) then
            itemLink = GetLootSlotLink(Button.slot);

            if (GL:empty(itemLink)) then
                itemLink = "";
            end
        end

        if (GL:tableGet(self.LootButtonItemLinkCache, buttonName, -1) ~= itemLink) then
            lootChanged = true;
        end

        self.LootButtonItemLinkCache[buttonName] = itemLink;
    end

    return lootChanged;
end

--- Remove the highlights on all loot buttons
---@return void
function DroppedLoot:removeHighlights()
    GL:debug("DroppedLoot:removeHighlights");

    if (GL.isRetail) then
        return;
    end

    for buttonIndex = 1, _G.LOOTFRAME_NUMBUTTONS do
        local Button = getglobal("LootButton" .. buttonIndex);

        if (Button) then
            LCG.PixelGlow_Stop(getglobal("LootButton" .. buttonIndex));
        end
    end
end

-- Highlight items that are soft-reserved or otherwise need extra attention
function DroppedLoot:highlightItemsOfInterest()
    GL:debug("DroppedLoot:highlightItemsOfInterest");

    -- 4 is the max since buttons seem to be reused
    -- throughout loot pages... thanks Blizzard
    for buttonIndex = 1, _G.LOOTFRAME_NUMBUTTONS do
        local Button = getglobal("LootButton" .. buttonIndex);

        if (Button and Button:IsVisible() and Button.slot) then
            local itemLink = GetLootSlotLink(Button.slot);

            if (itemLink) then
                GL:highlightItem(Button, itemLink);
            end
        end
    end
end

-- Hook click events to the item buttons in the
-- loot window (name LootButton1 through LootButton4)
-- Only 4 buttons will be used regardless of number of drops
-- Alt click opens the roll window, alt + shift opens the auctioneer window
function DroppedLoot:hookClickEvents()
    GL:debug("DroppedLoot:hookClickEvents");

    -- The first loot button should always exist,
    -- that way we can determine the button provider for all future buttons
    local buttonProvider = (function ()
        --- ElvUI support
        if (getglobal("ElvLootSlot1")) then
            return "ElvUI";
        end

        --- XLoot 1.0 support
        if (getglobal("XLootFrameButton1")) then
            return "XLoot1";
        end

        --- XLoot support
        if (getglobal("XLootButton1")) then
            return "XLoot";
        end

        --- default (vanilla) UI
        return "default";
    end)();

    --- Note: the default UI only supports 4 actionable buttons.
    --- Even though Add-ons like XLoot show more than 4 at a time, you can only interact with the first 4
    for buttonIndex = 1, _G.LOOTFRAME_NUMBUTTONS do
        self.ButtonsHooked[buttonProvider] = self.ButtonsHooked[buttonProvider] or {};

        if (not self.ButtonsHooked[buttonProvider][buttonIndex]) then
            local Button;
            if (buttonProvider == "ElvUI") then
                --Button = getglobal("ElvLootSlot" .. buttonIndex);
                -- No need to support the ElvUI button since it's handled by the
                -- HandleModifiedItemClick handler in bootstrap.lua
            elseif (buttonProvider == "XLoot1") then
                Button = getglobal("XLootFrameButton" .. buttonIndex);
            elseif (buttonProvider == "XLoot") then
                Button = getglobal("XLootButton" .. buttonIndex);
            else
                --Button = getglobal("LootButton" .. buttonIndex);
                -- No need to support the vanilla button since it's handled by the
                -- HandleModifiedItemClick handler in bootstrap.lua

                return;
            end

            --- No button with this index was found, no need to look further
            if (not Button) then
                break;
            end

            Button:HookScript("OnClick", function()
                local slot = tonumber(Button.slot) or buttonIndex;
                if (not slot) then
                    return;
                end

                HandleModifiedItemClick(GetLootSlotLink(slot));
            end);

            self.ButtonsHooked[buttonProvider][buttonIndex] = true;
        end
    end
end

-- Announce the loot that dropped in the party or raid chat
function DroppedLoot:announce(Modifiers)
    GL:debug("DroppedLoot:announce");

    Modifiers = Modifiers or {};
    local Functions = Modifiers.Functions or {
        GetNumLootItems = GetNumLootItems,
        GetLootSlotInfo = GetLootSlotInfo,
        GetLootSlotLink = GetLootSlotLink,
        GetLootSlotType = GetLootSlotType,
        GetLootSourceInfo = GetLootSourceInfo,
    };

    -- The sourceGUID is something we use to make sure
    -- we don't announce the same loot multiple times
    local sourceGUID = false;

    -- Fetch the name of everyone currently in the raid/party
    local PlayersInRaid = GL.User:groupMemberNames();

    -- Get the total number of items that dropped
    local itemCount = Functions.GetNumLootItems();

    -- Loop through every item in the loot window
    for lootIndex = 1, itemCount do
        local itemLink = Functions.GetLootSlotLink(lootIndex);

        -- This self-executing anonymous function gives us a bit more control
        (function ()
            local itemIsHardReserved = false;

            -- We need an itemLink to work with. If an item doesn't have it that means:
            --     It's not a "real" item but gold/silver/copper
            --     The item no longer exists in the loot window
            --     The data is not yet available
            if (not itemLink) then
                return;
            end

            -- Make sure we don't override sourceGUID with false/nil if it was already set!
            sourceGUID = sourceGUID or Functions.GetLootSourceInfo(lootIndex);

            -- We're missing crucial data, skip!
            if (GL:empty(sourceGUID) -- Make sure we have a sourceGUID
                or DroppedLoot.Announced[sourceGUID] -- We apparently already announced these items
            ) then
                return;
            end

            local quality = select(5, Functions.GetLootSlotInfo(lootIndex)) or 0;
            local lootType = Functions.GetLootSlotType(lootIndex);
            local SoftReserves = SoftRes:byItemLink(itemLink);
            local TMBInfo = TMB:byItemLink(itemLink);

            -- Check if we need to announce this item
            local itemID = tonumber(GL:getItemIDFromLink(itemLink)) or 0;

            -- Double checking just in case!
            if (not GL:higherThanZero(itemID)) then
                return;
            end

            -- Make sure we're dealing with an actual item here, not currency for example
            if (lootType ~= LOOT_SLOT_ITEM) then
                return;
            end

            if ((
                    quality < GL.Settings:get("DroppedLoot.minimumQualityOfAnnouncedLoot", 4) -- Quality is lower than our set minimum
                    or GL:inTable(Constants.ItemsThatShouldntBeAnnounced, itemID) -- We don't want to announce this item
                )
                and GL:empty(SoftReserves) -- No one (hard)reserved it
                and GL:empty(TMBInfo) -- No one has it on his wishlist and it's not a prio item
            ) then
                return;
            end

            -- Fetch the applicable SoftRes data (if any)
            local ActiveSoftResDetails = {};
            itemIsHardReserved = SoftRes:linkIsHardReserved(itemLink);
            if (not itemIsHardReserved -- Only fetch the SoftRes data if the item isn't hard-reserved
                and not GL:empty(SoftReserves) -- This item wasn't reserved
                and GL.Settings:get("SoftRes.announceInfoInChat") -- The player isn't interested in SoftRes data
            ) then
                ActiveSoftResDetails = self:getSoftResDetails(SoftReserves);
            end

            -- Determine the correct channel for announcing the loot
            -- Both GROUP and RAID_WARNING will default to PARTY if not in a raid or if you don't have assist
            local channel = "GROUP";
            if (GL.Settings:get("DroppedLoot.announceDroppedLootInRW")) then
                channel = "RAID_WARNING";
            end

            -- Either announce the item by itself or state that it's hard-reserved!
            if (itemIsHardReserved
                and GL.Settings:get("SoftRes.announceInfoInChat")
            ) then
                GL:sendChatMessage(
                    itemLink .. " (This item is hard-reserved!)",
                    channel
                );
            else
                -- Link the item in the chat for
                -- all group members to see
                GL:sendChatMessage(
                    itemLink,
                    channel
                );
            end

            --[[
                SHOW WHO RESERVED THIS ITEM (SOFTRES)
            ]]
            -- * This data is only available if the user has the announce SoftRes setting enabled
            if (not GL:empty(ActiveSoftResDetails)) then
                GL:sendChatMessage(
                    "Reserved by: " .. table.concat(ActiveSoftResDetails, ", "),
                    "GROUP"
                );
            end

            -- Fetch the applicable TMB data (if any)
            local ActiveWishListDetails = {};
            local ActivePrioListDetails = {};
            local maximumNumberOfAnnouncementEntries = GL.Settings:get("TMB.maximumNumberOfAnnouncementEntries", 5);
            if (TMBInfo and (
                GL.Settings:get("TMB.includePrioListInfoInLootAnnouncement")
                or GL.Settings:get("TMB.includeWishListInfoInLootAnnouncement")
            )) then
                ActivePrioListDetails, ActiveWishListDetails = self:getTMBDetails(TMBInfo, PlayersInRaid);
            end
            local itemIsOnSomeonesPriolist = not GL:empty(ActivePrioListDetails);
            local itemIsOnSomeonesWishlist = not GL:empty(ActiveWishListDetails);

            --[[
                SHOW WHO HAS PRIORITY ON THIS ITEM (TMB)
            ]]
            if (itemIsOnSomeonesPriolist
                and GL.Settings:get("TMB.includePrioListInfoInLootAnnouncement")
            ) then
                ActivePrioListDetails = TMB:sortEntries(ActivePrioListDetails);

                local entries = 0;
                local entryString = "";
                for _, Entry in pairs(ActivePrioListDetails) do
                    entries = entries + 1;

                    -- Add the player to the list (first entry should not start with a comma)
                    if (GL:empty(entryString)) then
                        entryString = GL:capitalize(Entry.player);
                    else
                        entryString = entryString .. ", " .. GL:capitalize(Entry.player);
                    end

                    -- The user only wants to see a limited number of entries, break!
                    if (entries >= maximumNumberOfAnnouncementEntries) then
                        break;
                    end
                end

                GL:sendChatMessage(
                    TMB:source() .. " Priority: " .. entryString,
                    "GROUP"
                );
            end

            --[[
                SHOW WHO WISHLISTED THIS ITEM (TMB)
            ]]
            if (itemIsOnSomeonesWishlist
                and GL.Settings:get("TMB.includeWishListInfoInLootAnnouncement")
                and (not itemIsOnSomeonesPriolist
                    or not GL.Settings:get("TMB.hideWishListInfoIfPriorityIsPresent")
                )
            ) then
                ActiveWishListDetails = TMB:sortEntries(ActiveWishListDetails);

                local entries = 0;
                local entryString = "";
                for _, Entry in pairs(ActiveWishListDetails) do
                    entries = entries + 1;

                    -- Add the player to the list (first entry should not start with a comma)
                    if (GL:empty(entryString)) then
                        entryString = GL:capitalize(Entry.player);
                    else
                        entryString = entryString .. ", " .. GL:capitalize(Entry.player);
                    end

                    -- The user only wants to see a limited number of entries, break!
                    if (entries >= maximumNumberOfAnnouncementEntries) then
                        break;
                    end
                end

                GL:sendChatMessage(
                    "TMB Wishlist: " .. entryString,
                    "GROUP"
                );
            end
        end)();
    end

    -- This ensures that we don't announce the same loot multiple times!
    -- Keep in mind that sourceGUID can be empty!
    if (sourceGUID) then
        DroppedLoot.Announced[sourceGUID] = true;
    end
end

--- Get all SoftRes details
---
---@return table
function DroppedLoot:getSoftResDetails(SoftReserves)
    local ActiveSoftResDetails = {};

    local ReservationsByPlayerName = {};
    for _, playerName in pairs(SoftReserves) do
        if (not ReservationsByPlayerName[playerName]) then
            ReservationsByPlayerName[playerName] = 1;
        else
            ReservationsByPlayerName[playerName] = ReservationsByPlayerName[playerName] + 1;
        end
    end

    -- This is necessary so we can sort the table based on number of reserves per item
    local Reservations = {};
    for playerName, reservations in pairs(ReservationsByPlayerName) do
        tinsert(Reservations, {
            player = playerName,
            reservations = reservations,
        })
    end
    ReservationsByPlayerName = {}; -- We no longer need this table, clean it up!

    -- Sort the reservations based on whoever reserved it more often (highest to lowest)
    table.sort(Reservations, function (a, b)
        if (a.reservations and b.reservations) then
            return a.reservations > b.reservations;
        end

        return false;
    end);

    -- Add the reservation details to ActiveReservations (add 2x / 3x etc when same item was reserved multiple times)
    for _, Entry in pairs(Reservations) do
        local entryString = Entry.player;

        -- User reserved the same item multiple times
        if (Entry.reservations > 1) then
            entryString = string.format("%s (%sx)", Entry.player, Entry.reservations);
        end

        tinsert(ActiveSoftResDetails, GL:capitalize(entryString));
    end

    return ActiveSoftResDetails;
end

--- Get all TMB details
---
---@return table, table
function DroppedLoot:getTMBDetails(TMBInfo, PlayersInRaid)
    local ActivePrioListDetails = {};
    local ActiveWishListDetails = {};

    -- Make sure we only show wishlist details of people
    -- Who are actually in the raid
    for _, Entry in pairs(TMBInfo) do
        local playerName = string.lower(Entry.character);

        --- NOTE TO SELF: it's (os) because of the string.lower, if you remove the lower then change below accordingly!
        if (not GL.User.isInGroup or GL:inTable(PlayersInRaid, string.gsub(playerName, "%(os%)", ""))) then
            local prio = Entry.prio;
            local entryType = Entry.type or Constants.tmbTypeWish;
            local isOffSpec = GL:strContains(playerName, "%(os%)");
            local prioOffset = 0;
            local sortingOrder = tonumber(prio);

            -- We add 100 to the prio (first key) of the object
            -- This object is used for sorting later and is not visible to the player
            if (isOffSpec) then
                prioOffset = 100;
            end

            if (not GL:empty(sortingOrder)) then
                sortingOrder = prio + prioOffset;
            else
                -- If for whatever reason we can't determine the
                -- item prio then we add it to the end of the list by default
                sortingOrder = 1000;
            end

            if (entryType == Constants.tmbTypePrio) then
                tinsert(ActivePrioListDetails, {
                    prio = sortingOrder,
                    player = string.format("%s[%s]", playerName, prio),
                });
            else
                tinsert(ActiveWishListDetails, {
                    prio = sortingOrder,
                    player = string.format("%s[%s]", playerName, prio),
                });
            end
        end
    end

    return ActivePrioListDetails, ActiveWishListDetails;
end

--- This function allows me to test the loot announcement without actually having to kill bosses in raids
--- It also enables me to debug issues other players may have using their actual TMB/SoftRes data
---
---@return void
function DroppedLoot:announceTest(...)
    local itemIDs = ...;

    if (type(itemIDs) ~= "table") then
        itemIDs = {itemIDs};
    end

    -- Make sure all item links are translated to IDs
    for key, value in pairs(itemIDs) do
        value = string.trim(value);
        local concernsID = GL:higherThanZero(tonumber(value));

        if (not concernsID) then
            value = GL:getItemIDFromLink(value) or 0;
        end

        itemIDs[key] = value;
    end

    GL:onItemLoadDo(itemIDs, function (Details)
        self:announce{
            Functions = {
                GetNumLootItems = function () return GL:count(Details); end,
                GetLootSlotInfo = function (slot)
                    local SlotItem = Details[slot];

                    return SlotItem.icon, SlotItem.name, 1, nil, SlotItem.quality, false, false, nil, true;
                end,
                GetLootSlotLink = function (slot)
                    return Details[slot].link or nil;
                end,
                GetLootSlotType = function(slot)
                    local itemLink = Details[slot].link or "";

                    if (GL:strContains(itemLink, "Hcurrency:")) then
                        return LOOT_SLOT_CURRENCY;
                    end

                    return LOOT_SLOT_ITEM;
                end,
                GetLootSourceInfo = function() return GL:uuid() end,
            }
        };
    end);
end
