local M = {}

local function get_active_buffers()
    local active_buffers = {}
    for tabnr = 1, vim.fn.tabpagenr("$") do
        for _, bufnr in ipairs(vim.fn.tabpagebuflist(tabnr)) do
            active_buffers[bufnr] = true
        end
    end
    return active_buffers
end

local function get_all_buffers()
    local all_buffers = {}
    for bufnr = 1, vim.fn.bufnr("$") do
        if vim.fn.buflisted(bufnr) == 1 then
            all_buffers[bufnr] = true
        end
    end
    return all_buffers
end

function M.remove_unused_buffers()
    local active_buffers = get_active_buffers()
    local all_buffers = get_all_buffers()
    local buffers_to_remove = {}

    for bufnr, _ in pairs(all_buffers) do
        if active_buffers[bufnr] == nil then
            buffers_to_remove[bufnr] = true
        end
    end

    for bufnr, _ in pairs(buffers_to_remove) do
        vim.cmd("bd " .. bufnr)
    end
end

function M.init()
    local map = require("helpers").map
    map("n", "<Leader>b", ":lua require('buffer_tools').remove_unused_buffers()<CR>")
end

return M