local kind_icon = {
	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 = '󰅲',
}

local menu_icon = {
	-- name
	buffer            = '',
	-- lsp
	['rust-analyzer'] = '',
	clangd            = '',
	cssls             = '',
	hls               = '',
	html              = '',
	jsonls            = '',
	lua_ls            = '',
	nixd              = '󱄅',
	ocamllsp          = '',
	svelte            = '',
	tsserver          = '',
}

---@param source cmp.Source
---@return string
local function get_menu_icon(source)
	local name = source.name
	local lsp = (
		source.source.client and
		source.source.client.config and
		source.source.client.config.name
	)

	return menu_icon[lsp] or menu_icon[name] or lsp or name
end

-- Reference: https://github.com/hrsh7th/nvim-cmp#recommended-configuration
return function()
	local cmp = require 'cmp'

	cmp.setup {
		-- Expand snippet in buffer
		snippet = {
			expand = function(args)
				vim.snippet.expand(args.body)
			end,
		},
		-- Completion menu appearance
		-- https://github.com/hrsh7th/nvim-cmp/wiki/Menu-Appearance
		formatting = {
			expandable_indicator = true,
			fields = { 'kind', 'abbr', 'menu' },
			format = function(entry, item)
				item.kind = kind_icon[item.kind] or ' '
				item.menu = get_menu_icon(entry.source)

				-- Get the completion entry text shown in the completion window.
				local content = item.abbr

				-- Get the width of the current window.
				local win_width = vim.api.nvim_win_get_width(0)
				local max_width = math.floor(win_width * 0.2)

				if #content > max_width then
					item.abbr = vim.fn.strcharpart(content, 0, max_width - 3) .. "..."
				else
					item.abbr = content .. (" "):rep(max_width - #content)
				end

				return item
			end,
		},
		window = {
			completion = cmp.config.window.bordered(),
			documentation = cmp.config.window.bordered(),
		},
		mapping = cmp.mapping.preset.insert {
			['<C-b>']  = cmp.mapping.scroll_docs(-4),
			['<C-f>']  = cmp.mapping.scroll_docs(4),
			['<C-CR>'] = cmp.mapping.complete(),
			['<C-e>']  = cmp.mapping.abort(),
			['<CR>']   = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
		},
		sources = cmp.config.sources(
			{
				{ name = 'nvim_lsp' }
			},
			{
				{ name = 'buffer' }
			}
		)
	}

	-- Use buffer source for `/` and `?` (if you enabled `native_menu`, this won't work anymore).
	cmp.setup.cmdline({ '/', '?' }, {
		mapping = cmp.mapping.preset.cmdline(),
		sources = {
			{ name = 'buffer' }
		}
	})

	-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
	cmp.setup.cmdline(':', {
		mapping = cmp.mapping.preset.cmdline(),
		sources = cmp.config.sources({
			{ name = 'path' }
		}, {
			{ name = 'cmdline' }
		})
	})
end