local config = function()
    local cmp = require "cmp"
    local luasnip = require "luasnip"
    local cmp_autopairs = require "nvim-autopairs.completion.cmp"

    cmp.setup {
        snippet = {
            expand = function(args)
                luasnip.lsp_expand(args.body) -- For `luasnip` users.
            end,
        },
        mapping = cmp.mapping.preset.insert {
            ["<C-u>"] = cmp.mapping.scroll_docs(-4), -- Up
            ["<C-d>"] = cmp.mapping.scroll_docs(4), -- Down
            ["<C-Space>"] = cmp.mapping.complete(),
            ["<CR>"] = cmp.mapping.confirm {
                behavior = cmp.ConfirmBehavior.Replace,
                select = true,
            },
            ["<Tab>"] = cmp.mapping(function(fallback)
                if cmp.visible() then
                    cmp.select_next_item()
                elseif luasnip.expand_or_jumpable() then
                    luasnip.expand_or_jump()
                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" }),
        },
        sources = { { name = "nvim_lsp" }, { name = "luasnip" } },
    }

    -- Set configuration for specific filetype.
    cmp.setup.filetype("norg", { sources = { { name = "neorg" } } })
    cmp.setup.cmdline({ "/", "?" }, { mapping = cmp.mapping.preset.cmdline(), sources = { { name = "buffer" } } })
    cmp.setup.cmdline(
        ":",
        { mapping = cmp.mapping.preset.cmdline(), sources = { { name = "path" }, { name = "cmdline" } } }
    )

    cmp.event:on("confirm_done", cmp_autopairs.on_confirm_done())
end

return {
    "hrsh7th/nvim-cmp",
    cond = not vim.g.vscode,
    event = { "InsertEnter", "CmdlineEnter" },
    dependencies = {
        "hrsh7th/cmp-nvim-lsp",
        "hrsh7th/cmp-buffer",
        "hrsh7th/cmp-path",
        "hrsh7th/cmp-cmdline",
        "windwp/nvim-autopairs",
        "saadparwaiz1/cmp_luasnip",
        "L3MON4D3/LuaSnip",
    },
    config = config,
}