local cmp = require('cmp')
local luasnip = require('luasnip')
require('luasnip/loaders/from_vscode').lazy_load()

cmp.setup({
    completion = {
        keyword_length = 1,
        completeopt = 'menu,menuone',
    },
    window = {
        completion = cmp.config.window.bordered(),
        documentation = cmp.config.window.bordered(),
    },
    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 = {
        ['<C-k>'] = cmp.mapping.select_prev_item(),
        ['<C-j>'] = cmp.mapping.select_next_item(),
        ['<C-b>'] = cmp.mapping(cmp.mapping.scroll_docs(-1), { 'i', 'c' }),
        ['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(1), { 'i', 'c' }),
        ['<C-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
        ['<C-u>'] = cmp.mapping.scroll_docs(-4),
        ['<C-d>'] = cmp.mapping.scroll_docs(4),
        ['<C-y>'] = cmp.config.disable,
        ['<C-c>'] = cmp.mapping({
            i = cmp.mapping.abort(),
            c = cmp.mapping.close(),
        }),
        ['<CR>'] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Replace,
            select = false,
        }),
        ['<Tab>'] = cmp.mapping(function(fallback)
            if cmp.visible() then
                cmp.select_next_item()
            elseif luasnip.expandable() then
                luasnip.expand()
            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' }),
    },
    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
    },
})