local has_words_before = function()
    unpack = unpack or table.unpack
    local line, col = unpack(vim.api.nvim_win_get_cursor(0))
    return col ~= 0 and vim.api.nvim_buf_get_lines(
        0,
        line - 1,
        line,
        true
    )[1]:sub(col, col):match('%s') == nil
end

local get_ws = function (max, len)
    return (" "):rep(max - len)
end

-- Add additional capabilities supported by nvim-cmp
local capabilities = require('cmp_nvim_lsp').default_capabilities()
local luasnip = require("luasnip")
local kind_icons = {
    Text = "",
    Method = "󰆧",
    Function = "󰊕",
    Constructor = "",
    Field = "󰇽",
    Variable = "󰂡",
    Class = "󰠱",
    Interface = "",
    Module = "",
    Property = "󰜢",
    Unit = "",
    Value = "󰎠",
    Enum = "",
    Keyword = "󰌋",
    Snippet = "",
    Color = "󰏘",
    File = "󰈙",
    Reference = "",
    Folder = "󰉋",
    EnumMember = "",
    Constant = "󰏿",
    Struct = "",
    Event = "",
    Operator = "󰆕",
    TypeParameter = "󰅲",
}
-- nvim-cmp setup
local cmp = require 'cmp'
cmp.setup {
    mapping = {
        ["<Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_next_item()
                -- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable() 
                -- they way you will only jump inside the snippet region
            elseif luasnip.expand_or_jumpable() then
                luasnip.expand_or_jump()
            elseif has_words_before() then
                cmp.complete()
            else
                fallback()
            end
        end, { "i", "s" }),

        ["<S-Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_prev_item()
            elseif luasnip.jumpable(-1) then
                luasnip.jump(-1)
            else
                fallback()
            end
        end, { "i", "s" }),
        ["<C-b>"] = cmp.mapping(cmp.mapping.scroll_docs(-4), {'i', 'c'}),
        ["<C-f>"] = cmp.mapping(cmp.mapping.scroll_docs(4), {'i', 'c'}),
        ["<C-Space>"] = cmp.mapping(cmp.mapping.complete(), {'i', 'c'}),
        ["<C-e>"] = cmp.mapping({ i = cmp.mapping.close(), c = cmp.mapping.close() }),
    },
    formatting = {
        format = function(_, vim_item)
            vim_item.kind = string.format('%s %s', kind_icons[vim_item.kind], vim_item.kind)
            
            local content = vim_item.abbr
            if #content > 25 then
            vim_item.abbr = vim.fn.strcharpart(content, 0, 25) .. "…"
            else
                vim_item.abbr = content .. get_ws(25, #content)
            end

            return vim_item
        end,
    },
    sources = {
        {name = 'path'},
        {name = 'nvim_lsp', keyword_length = 1},
        {name = 'buffer', keyword_length = 3},
        {name = 'luasnip', keyword_length = 2},
    },
}