--------------------
-- Packer Bootstrap
--------------------
local packer_installed, _ = pcall(require, 'packer')
local packer_bootstrap = false
if (not packer_installed) then
	-- ask user whether packer should be bootstrapped
	packer_bootstrap = require('utils').prompt(
		'Plugin manager packer not found. Install it now?',
		'Bootstrapping packer now...',
		'Skipping setup of packer and plugins.')

	if (not packer_bootstrap) then
		return
	end

	-- perform actual bootstrap
	local fn = vim.fn
	local install_path = fn.stdpath('data') .. '/site/pack/packer/start/packer.nvim'
	fn.system({'git', 'clone', '--depth', '1', 'https://github.com/wbthomason/packer.nvim', install_path})
	vim.cmd('packadd packer.nvim')
end

-- helper function to be used `config` parameter of packer's use to externalize
-- plugin configuration, expects the name of the config file
function load_config(name)
  return string.format('require("plugins/%s")', name)
end

return require('packer').startup({
	function(use)
		use 'wbthomason/packer.nvim'

		--------------------
		-- Visuals
		--------------------
		use { -- colorblind-friendly colorscheme
			'projekt0n/github-nvim-theme',
			config = load_config('github-nvim-theme'),
		}
		use { -- color highlighter
			'norcalli/nvim-colorizer.lua',
			config = function() require('colorizer').setup() end,
		}

		--------------------
		-- Package Manager
		--------------------
		use { -- portable package manager
			'williamboman/mason.nvim',
			config = load_config('mason'),
		}
		use { -- update helper for mason
			'WhoIsSethDaniel/mason-tool-installer.nvim',
			after = { 'mason.nvim' },
			config = function() require('mason-tool-installer').setup({}) end,
		}

		--------------------
		-- LSP Setup
		--------------------
		use { -- compatibility layer between mason and lspconfig + autoinstaller
			'williamboman/mason-lspconfig.nvim',
			after = { 'mason.nvim' },
			requires = {
				'neovim/nvim-lspconfig',
			},
		}
		use { -- configuration layer for neovim LSP client
			'neovim/nvim-lspconfig',
			after = {
				'mason-lspconfig.nvim',
				'cmp-nvim-lsp',
			},
			config = load_config('lspconfig'),
		}

		--------------------
		-- Snippets
		--------------------
		use { -- snippet engine
			'L3MON4D3/LuaSnip',
			requires = {
				'saadparwaiz1/cmp_luasnip',
				'rafamadriz/friendly-snippets',
			},
		}
		use { -- various snippets
			'rafamadriz/friendly-snippets',
			after = { 'LuaSnip' },
			config = load_config('friendly-snippets'),
		}

		--------------------
		-- Completion
		--------------------
		use { -- nvim-cmp source for nvim-lsp
			'hrsh7th/cmp-nvim-lsp',
			requires = { 'hrsh7th/nvim-cmp' },
		}
		use { -- nvim-cmp source for LuaSnip
			'saadparwaiz1/cmp_luasnip',
			requires = { 'hrsh7th/nvim-cmp' },
			after = { 'LuaSnip' },
		}
		use { -- nvim-cmp source for buffer words
			'hrsh7th/cmp-buffer',
			requires = { 'hrsh7th/nvim-cmp' },
		}
		use { -- nvim-cmp source for filesystem paths
			'hrsh7th/cmp-path',
			requires = { 'hrsh7th/nvim-cmp' },
		}
		use { -- nvim-cmp source for vim's cmdline
			'hrsh7th/cmp-cmdline',
			requires = { 'hrsh7th/nvim-cmp' },
		}
		use { -- completion engine
			'hrsh7th/nvim-cmp',
			after = {
				'cmp-nvim-lsp',
				'cmp-buffer',
				'cmp-path',
				'cmp-cmdline',
				'cmp_luasnip'
			},
			config = load_config('nvim-cmp'),
		}

		-- Automatically set up your configuration after cloning packer.nvim
		-- Put this at the end after all plugins
		if packer_bootstrap then
			require('packer').sync()
		end
	end,
	config = {
		display = {
			open_fn = require("packer.util").float,
		},
		profile = {
			enable = true,
			threshold = 1, -- the amount in ms that a plugins load time must be over for it to be included in the profile
		},
	},
})