local M = {}

local luasnip = require('luasnip')
local cmp = require('cmp')
local compare = require('cmp.config.compare')
local lspkind = require('lspkind')

-- Global config table
M.cmp = {
	preselect = cmp.PreselectMode.None,
	snippet = {
		expand = function(args)
			luasnip.lsp_expand(args.body)
		end,
	},
	window = {
		completion = {
			scrollbar = false,
		},
	},
	mapping = {
		['<Tab>'] = cmp.mapping(function(fallback)
			if cmp.visible() then
				cmp.select_next_item()
			elseif luasnip.expand_or_locally_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.locally_jumpable(-1) then
				luasnip.jump(-1)
			else
				fallback()
			end
		end, { 'i', 's' }),
		['<CR>'] = cmp.mapping {
			i = function(fallback)
				if cmp.visible() and cmp.get_active_entry() then
					cmp.confirm { behavior = cmp.ConfirmBehavior.Replace, select = false }
				else
					fallback()
				end
			end,
			s = cmp.mapping.confirm { select = false },
			c = cmp.mapping.confirm {
				behavior = cmp.ConfirmBehavior.Insert,
				select = false,
			},
		},
		['<C-b>'] = cmp.mapping.scroll_docs(-4),
		['<C-f>'] = cmp.mapping.scroll_docs(4),
		['<C-d>'] = cmp.mapping(function(fallback)
			if cmp.visible() then
				if cmp.visible_docs() then
					cmp.close_docs()
				else
					cmp.open_docs()
				end
			end
			fallback()
		end),
		['<C-e>'] = cmp.mapping.abort(),
	},
	sources = cmp.config.sources {
		{ name = 'nvim_lsp' },
		{ name = 'luasnip' },
		{ name = 'lazydev', group_index = 0 },
		{ name = 'path' },
		{ name = 'buffer', keyword_length = 5 },
		{ name = 'conjure' },
		{ name = 'emoji', priority = -20 },
	},
	formatting = {
		format = lspkind.cmp_format {
			mode = 'symbol_text',
			menu = {
				buffer = '[BUF]',
				nvim_lsp = '[LSP]',
				path = '[PTH]',
				luasnip = '[SNP]',
				emoji = '[EMJ]',
			},
			maxwidth = 50,
			ellipsis_char = '',
		},
	},
	experimental = {
		ghost_text = true,
	},
	sorting = {
		priority_weight = 0.8,
		comparators = {
			compare.score,
			compare.exact,
			compare.offset,
			compare.sort_text,
			compare.scopes,
			compare.recently_used,
			compare.order,
			compare.kind,
			compare.length,
		},
	},
	performance = {
		fetching_timeout = 30,
	},
}

--- Configure completion for commandline
M.cmd = function()
	-- completion for searches
	cmp.setup.cmdline({ '/', '?' }, {
		mapping = cmp.mapping.preset.cmdline(),
		sources = {
			{ name = 'buffer' },
		},
	})

	cmp.setup.cmdline({ '@' }, {
		mapping = cmp.mapping.preset.cmdline(),
		sources = {
			{ name = 'cmdline' },
		},
	})

	cmp.setup.cmdline(':', {
		mapping = cmp.mapping.preset.cmdline(),
		sources = cmp.config.sources({
			{ name = 'path' },
		}, {
			{ name = 'cmdline' },
		}),
	})
end

return M