-- configure autocomplete
return {
    'hrsh7th/nvim-cmp',
    event = { 'InsertEnter', 'CmdlineEnter' },
    dependencies = {
        -- autocomplete plugins
        'hrsh7th/cmp-buffer',
        'hrsh7th/cmp-path',
        'hrsh7th/cmp-cmdline',
        'hrsh7th/cmp-nvim-lsp',
        'hrsh7th/cmp-nvim-lua',
        'saadparwaiz1/cmp_luasnip',
        -- "hrsh7th/cmp-nvim-lsp-signature-help",
        -- "hrsh7th/cmp-calc",

        -- vscode like icons to autocomplete list
        'onsails/lspkind.nvim',
        -- snippet plugin
        { 'L3MON4D3/LuaSnip', event = { 'BufReadPost', 'BufNewFile' } },
        { 'rafamadriz/friendly-snippets', event = { 'BufReadPost', 'BufNewFile' } },
    },
    config = function()
        local cmp = require('cmp')
        local luasnip = require('luasnip')
        require('luasnip/loaders/from_vscode').lazy_load()

        cmp.setup({
            completion = {
                keyword_length = 1,
                completeopt = 'menu,menuone',
            },
            formatting = {
                fields = { 'kind', 'abbr', 'menu' },
                format = function(entry, vim_item)
                    local kind = require('lspkind').cmp_format({ mode = 'symbol_text', maxwidth = 50 })(entry, vim_item)
                    local strings = vim.split(kind.kind, '%s', { trimempty = true })
                    kind.kind = ' ' .. (strings[1] or '') .. ' '
                    kind.menu = '    (' .. (strings[2] or '') .. ')'

                    return kind
                end,
            },
            snippet = { -- configure how nvim-cmp interacts with snippet engine
                expand = function(args)
                    luasnip.lsp_expand(args.body)
                end,
            },
            mapping = {
                ['<Tab>'] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Insert }),
                ['<S-Tab>'] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Insert }),
                ['<C-k>'] = cmp.mapping.scroll_docs(-4),
                ['<C-j>'] = cmp.mapping.scroll_docs(4),
                ['<C-Space>'] = cmp.mapping.complete(), -- show completion suggestions
                ['<C-e>'] = cmp.mapping.abort(), -- close completion window
                ['<Esc>'] = cmp.mapping.close(),
                ['<CR>'] = cmp.mapping.confirm({
                    behavior = cmp.ConfirmBehavior.Insert,
                    select = true,
                }),
            },
            cmp.setup.cmdline(':', {
                mapping = cmp.mapping.preset.cmdline(),
                sources = {
                    { name = 'cmdline' },
                },
            }),
            cmp.setup.cmdline({ '/', '?' }, {
                mapping = cmp.mapping.preset.cmdline(),
                sources = {
                    { name = 'buffer' },
                },
            }),
            -- sources for autocompletion
            sources = {
                { name = 'nvim_lsp' },
                { name = 'luasnip' }, -- snippets
                { name = 'buffer' }, -- text within current buffer
                { name = 'path' }, -- file system paths
                { name = 'codeium' }, -- AI for autocompletion
                -- { name = "nvim_lsp_signature_help" },
                -- { name = "calc" }, --for maths calculations
            },
        })
    end,
}