local modname = minetest.get_current_modname()
local ci = {}
ci.blocks = {}      -- Die komplette Master-Liste aller Items
ci.pages = {}       -- Speichert Seite UND Anzahl pro Spieler
ci.searches = {}    -- Speichert den aktuellen Suchbegriff pro Spieler

local columns = 15
local rows = 7
local nodes_per_page = columns * rows

minetest.register_privilege("ci", {
    description = "Allows the player to use the ci command",
    give_to_singleplayer = false
})

local function has_permission(player_name)
    return minetest.check_player_privs(player_name, {ci=true})
end

-- Items laden
minetest.register_on_mods_loaded(function()
    minetest.after(0, function()
        local list_items = minetest.settings:get_bool("ci_list_items") ~= false
        local list_tools = minetest.settings:get_bool("ci_list_tools") ~= false
        
        ci.blocks = {}
        for name, def in pairs(minetest.registered_items) do
            if def and name ~= "" and not name:find("alias:") then
                local is_node = (def.type == "node")
                local is_tool = (list_tools and def.type == "tool")
                local is_item = (list_items and (def.type == "craftitem" or def.type == "none" or not def.type))

                if is_node or is_tool or is_item then
                    table.insert(ci.blocks, name)
                end
            end
        end
        table.sort(ci.blocks)
        print("[ci] " .. #ci.blocks .. " Einträge geladen.")
    end)
end)

minetest.register_on_leaveplayer(function(player)
    local player_name = player:get_player_name()
    ci.pages[player_name] = nil
    ci.searches[player_name] = nil
end)

function ci.get_filtered_blocks(player_name)
    local search_term = ci.searches[player_name]
    if not search_term or search_term == "" then return ci.blocks end

    local filtered = {}
    local term_lower = search_term:lower()
    for _, item_name in ipairs(ci.blocks) do
        if item_name:lower():find(term_lower, 1, true) then
            table.insert(filtered, item_name)
        end
    end
    return filtered
end

function ci.get_formspec(player)
    local player_name = player:get_player_name()
    local filtered_blocks = ci.get_filtered_blocks(player_name)
    
    -- Struktur für Spieler-Status sicherstellen
    if not ci.pages[player_name] then
        ci.pages[player_name] = {page = 1, quantity = 1}
    end
    
    local current_page = ci.pages[player_name].page
    local current_qty = ci.pages[player_name].quantity
    local total_pages = math.ceil(#filtered_blocks / nodes_per_page)

    if current_page > total_pages then
        current_page = math.max(1, total_pages)
        ci.pages[player_name].page = current_page
    end

    local current_search = ci.searches[player_name] or ""

    local formspec = "size[17.5,12.8]" ..
        "label[0.5,0.2;Wähle ein Item für dein Inventar:]"

    local start_index = (current_page - 1) * nodes_per_page + 1
    local end_index = math.min(current_page * nodes_per_page, #filtered_blocks)

    for i = start_index, end_index do
        local block = filtered_blocks[i]
        local rel = i - start_index
        local col = rel % columns
        local row = math.floor(rel / columns)
        local x = 0.5 + col * 1.1
        local y = 1 + row * 1.1

        -- Button mit technischem Namen im Tooltip
        formspec = formspec ..
            string.format("item_image_button[%f,%f;1,1;%s;add_%s;]",
                x, y, minetest.formspec_escape(block), minetest.formspec_escape(block)) ..
            string.format("tooltip[add_%s;%s\n[%s]]", 
                minetest.formspec_escape(block), 
                minetest.formspec_escape(minetest.registered_items[block].description or ""),
                minetest.formspec_escape(block))
    end

    -- Steuerelemente (Anzahl-Feld nutzt jetzt current_qty)
    formspec = formspec ..
        "field[0.5,9.2;5.5,1;search;Suche:;" .. minetest.formspec_escape(current_search) .. "]" ..
        "button[6.1,8.85;2,1;do_search;Suchen]" ..
        "button[8.2,8.85;1,1;reset_search;X]" ..
        "field[13.0,9.2;4,1;quantity;Anzahl:;" .. current_qty .. "]"

    formspec = formspec ..
        "label[8,10.4;Seite " .. current_page .. " von " .. total_pages .. "]"
    if current_page > 1 then
        formspec = formspec .. "button[6.8,10.4;1.2,1;prev;<<]"
    end
    if current_page < total_pages then
        formspec = formspec .. "button[9.5,10.4;1.2,1;next;>>]"
    end

    formspec = formspec .. "button_exit[7.75,11.5;2,1;exit;Schließen]"

    return formspec
end

minetest.register_chatcommand("ci", {
    description = "Kreativ-Inventar öffnen",
    privs = {ci=true},
    func = function(name)
        if not has_permission(name) then return false, "Keine Rechte." end
        ci.pages[name] = {page = 1, quantity = 1}
        ci.searches[name] = nil
        local player = minetest.get_player_by_name(name)
        if player then minetest.show_formspec(name, modname .. ":form", ci.get_formspec(player)) end
        return true
    end,
})

minetest.register_on_player_receive_fields(function(player, formname, fields)
    if formname ~= modname .. ":form" then return end
    local player_name = player:get_player_name()
    if not has_permission(player_name) then return end

    -- Aktuelle Anzahl immer zwischenspeichern, wenn ein Feld gesendet wird
    if fields.quantity then
        ci.pages[player_name].quantity = tonumber(fields.quantity) or 1
    end

    if fields.do_search or (fields.key_enter_field and fields.key_enter_field == "search") then
        ci.searches[player_name] = fields.search
        ci.pages[player_name].page = 1
        minetest.show_formspec(player_name, modname .. ":form", ci.get_formspec(player))
        return
    elseif fields.reset_search then
        ci.searches[player_name] = nil
        ci.pages[player_name].page = 1
        minetest.show_formspec(player_name, modname .. ":form", ci.get_formspec(player))
        return
    end

    if fields.next then
        ci.pages[player_name].page = ci.pages[player_name].page + 1
        minetest.show_formspec(player_name, modname .. ":form", ci.get_formspec(player))
        return
    elseif fields.prev then
        ci.pages[player_name].page = math.max(1, ci.pages[player_name].page - 1)
        minetest.show_formspec(player_name, modname .. ":form", ci.get_formspec(player))
        return
    end

    for field, _ in pairs(fields) do
        if field:sub(1, 4) == "add_" then
            local itemname = field:sub(5)
            local qty = ci.pages[player_name].quantity
            local inv = player:get_inventory()
            if inv then
                inv:add_item("main", itemname .. " " .. qty)
                minetest.chat_send_player(player_name, "Hinzugefügt: " .. qty .. "x " .. itemname)
            end
            -- Formspec bleibt offen, Anzahl bleibt erhalten
            minetest.show_formspec(player_name, modname .. ":form", ci.get_formspec(player))
            return
        end
    end
end)

-- i3 Integration
minetest.after(0, function()
  if minetest.global_exists("i3_extrabuttons") then
    i3_extrabuttons.new_tab("cinventory", {
      description = "Kreativ-Inventar",
      priv = "ci",
      formspec = function(player, data, fs) end,
      fields = function(player, data, fields)
        i3.set_tab(player, "inventory")
        minetest.show_formspec(player:get_player_name(), modname .. ":form", ci.get_formspec(player))
      end,
    })
  end
end)