vim.opt.completeopt = { "menu", "menuone", "popup" }

local cmp = require("cmp")

cmp.setup({
	-- snippet setup configuration
	snippet = {
		expand = function(args)
			vim.fn["UltiSnips#Anon"](args.body)
		end,
	},

	-- Window/Menu
	view = {
		entries = "custom"
	},

	window = {
		completion = cmp.config.window.bordered(),
		documentation = cmp.config.window.bordered(),
	},

	-- Add ghost text because it's fancy
	experimental = {
		ghost_text = {},
	},

	-- mapping
	mapping = cmp.mapping.preset.insert({
		-- Shift+TAB to go to the Previous Suggested item
		["<C-k>"] = cmp.mapping.select_prev_item(),
		-- Tab to go to the next suggestion
		["<C-j>"] = cmp.mapping.select_next_item(),
		-- CTRL+SHIFT+f to scroll backwards in description
		["<C-S-f>"] = cmp.mapping.scroll_docs(-4),
		-- CTRL+F to scroll forwards in the description
		["<C-f>"] = cmp.mapping.scroll_docs(4),
		-- CTRL+SPACE to bring up completion at current Cursor location
		["<C-Space>"] = cmp.mapping.complete(),
		-- CTRL+e to exit suggestion and close it
		["<C-d>"] = cmp.mapping.close(), -- TODO: Search better option
		-- CR (enter or return) to CONFIRM the currently selection suggestion
		-- We set the ConfirmBehavior to insert the Selected suggestion
		["<CR>"] = cmp.mapping.confirm({
			behavior = cmp.ConfirmBehavior.Insert,
			select = true,
		}),
	}),

	-- sources
	sources = cmp.config.sources({
		{ name = "path" },
		{ name = "ultisnips", keyword_length = 1 },
		{ name = "calc" },
		{ name = "lua-latex-symbols", option = { cache = true } },
		{ name = "buffer", keyword_length = 3 },
		{ name = "nvim_lsp", keyword_length = 2},
	}),
	
	-- formatting
	formatting = {
		fields = { "menu", "abbr", "kind" },
		format = function (entry, item)
			local menu_icon = {
				path = "𝦶",
				ultisnips = "✂",
				calc = "Σ",
				lualatexsymbols = "󰿈",
				buffer = "󰘝",
				nvim_lsp = "⌨"
			}
			item.menu = menu_icon[entry.source.name]
			return item
		end,
	},
})

cmp.setup.cmdline({ "/", "?" }, {
	mapping = cmp.mapping.preset.cmdline(),
	sources = {
		{ name = "buffer" },
		{ name = "fuzzy_path", keyword_length = 4 },
	},
	formatting = {
		fields = { "menu", "abbr", "kind" },
		format = function(entry, item)
			local menu_icon = {
				buffer = "󰱼",
				fuzzy_path = "",
			}
			item.menu = menu_icon[entry.source.name]
			return item
		end,
	},
})

-- Use cmdline & path source for ':' (if you enabled `native_menu`, this won't work anymore).
cmp.setup.cmdline(":", {
	view = {
		entries = { name = 'wildmenu', separator = "|" }
	},
	mapping = cmp.mapping.preset.cmdline(),
	sources = cmp.config.sources({
		{ name = "path" },
		{ name = "cmdline_history", keyword_length = 24 },
	}, {
		{ name = "cmdline", keyword_length = 1 },
	}),
	formatting = {
		fields = { "menu", "abbr", "kind" },
		format = function(entry, item)
			local menu_icon = {
				path = "󰙅",
				cmdline = "",
				cmdline_history = "󰂺 ",
			}
			item.menu = menu_icon[entry.source.name]
			return item
		end,
	},
})