local cmp = require("cmp")
local types = require('cmp.types')
local luasnip = require("luasnip")
local lspkind = require("lspkind")

-- loads vscode style snippets from installed plugins (e.g. friendly-snippets)
require("luasnip.loaders.from_vscode").lazy_load()

cmp.setup({
    completion = {
        completeopt = "menu,menuone,preview,noinsert",
        autocomplete = { types.cmp.TriggerEvent.TextChanged },
    },
    window = {
        documentation = {
            border = { '┌', '─', '┐', '│', '┘', '─', '└', '│' },
            winhighlight = 'Normal:CmpPmenu,FloatBorder:CmpPmenuBorder,CursorLine:PmenuSel,Search:None',
        },
        completion = {
            side_padding = 1,
            border = { '┌', '─', '┐', '│', '┘', '─', '└', '│' },
            winhighlight = 'Normal:CmpPmenu,FloatBorder:CmpPmenuBorder,CursorLine:PmenuSel,Search:None',
            scrollbar = false,
        },
    },
    snippet = { -- configure how nvim-cmp interacts with snippet engine
        expand = function(args)
            luasnip.lsp_expand(args.body)
        end,
    },
    mapping = cmp.mapping.preset.insert({
        ["<C-o>"] = cmp.mapping.complete(),                -- show completion suggestions
        ["<C-e>"] = cmp.mapping.abort(),                   -- close completion menu
        ["<CR>"] = cmp.mapping.confirm({ select = true }), -- accept current selection
    }),
    -- sources for autocompletion
    sources = cmp.config.sources({
        { name = "nvim_lsp" },
        { name = "luasnip" }, -- snippets
        { name = "buffer" },  -- text within current buffer
        { name = "path" },    -- file system paths,
        { name = 'nvim_lsp_signature_help' },
    }),
    -- configure lspkind for vs-code like pictograms in completion menu
    formatting = {
        format = lspkind.cmp_format({
            maxwidth = 50,
            ellipsis_char = "...",
        }),
    },
})