-- auto install packer if not installed
local ensure_packer = function()
	local fn = vim.fn
	local install_path = fn.stdpath("data") .. "/site/pack/packer/start/packer.nvim"
	if fn.empty(fn.glob(install_path)) > 0 then
		fn.system({ "git", "clone", "--depth", "1", "https://github.com/wbthomason/packer.nvim", install_path })
		vim.cmd([[packadd packer.nvim]])
		return true
	end
	return false
end
local packer_bootstrap = ensure_packer() -- true if packer was just installed

-- autocommand that reloads neovim and installs/updates/removes plugins
-- when file is saved
vim.cmd([[
  augroup packer_user_config
    autocmd!
    autocmd BufWritePost plugins-setup.lua source <afile> | PackerSync
  augroup end
]])

-- import packer safely
local status, packer = pcall(require, "packer")
if not status then
	return
end

-- add list of plugins to install
return packer.startup(function(use)
	-- packer can manage itself
	use("wbthomason/packer.nvim")

	use("nvim-lua/plenary.nvim") -- lua functions that many plugins use

	-- transparent background
	use("xiyaowong/transparent.nvim")

	-- colorscheme
	use({
		"zenbones-theme/zenbones.nvim",
		requires = { "rktjmp/lush.nvim" }, -- needed for extended colors
	})

	use("szw/vim-maximizer") -- maximizes and restores current window

	-- don't take this out; allows for pane navigation on splits
	use({
		"numToStr/Navigator.nvim",
		config = function()
			require("Navigator").setup()
		end,
	})

	use("tpope/vim-surround") -- add, delete, change surroundings (it's awesome)
	use("inkarkat/vim-ReplaceWithRegister") -- replace with register contents using motion (gr + motion)

	-- file explorer
	use({ "stevearc/oil.nvim" })
	-- extension(s) to oil
	use({
		"JezerM/oil-lsp-diagnostics.nvim",
		"nvim-tree/nvim-web-devicons", -- actually important
		requires = { "stevearc/oil.nvim" },
	})

	-- statusline
	use({ "nvim-lualine/lualine.nvim" })

	-- fuzzy finding w/ telescope
	use({ "nvim-telescope/telescope-fzf-native.nvim", run = "make" }) -- dependency for better sorting performance
	use({
		"nvim-telescope/telescope.nvim",
		branch = "0.1.x",
	}) -- fuzzy finder

	-- autocompletion
	use("hrsh7th/nvim-cmp") -- completion plugin
	use("hrsh7th/cmp-buffer") -- source for text in buffer
	use("hrsh7th/cmp-path") -- source for file system paths

	-- snippets
	use("L3MON4D3/LuaSnip") -- snippet engine
	use("saadparwaiz1/cmp_luasnip") -- for autocompletion
	use("rafamadriz/friendly-snippets") -- useful snippets

	-- managing & installing lsp servers, linters & formatters
	use("williamboman/mason.nvim") -- in charge of managing lsp servers, linters & formatters
	use("williamboman/mason-lspconfig.nvim") -- bridges gap b/w mason & lspconfig
	use("mfussenegger/nvim-lint") -- installed because of mypy linter

	-- configuring lsp servers
	use("neovim/nvim-lspconfig") -- easily configure language servers
	use("hrsh7th/cmp-nvim-lsp") -- for autocompletion
	use({
		"nvimdev/lspsaga.nvim",
		after = "nvim-lspconfig",
		config = function()
			require("lspsaga").setup({
				-- keybinds for navigation in lspsaga window
				scroll_preview = { scroll_down = "<C-f>", scroll_up = "<C-b>" },
				-- use enter to open file with definition preview
				definition = {
					edit = "<CR>",
				},
				ui = {
					colors = {
						normal_bg = "#022746",
					},
				},
			})
		end,
	})
	-- spec for jaclang lsp
	use({ "Jaseci-Labs/jac-vim" })

	-- vs-code like icons for autocompletion
	use("onsails/lspkind.nvim")

	-- treesitter configuration
	use({
		"nvim-treesitter/nvim-treesitter",
		run = function()
			local ts_update = require("nvim-treesitter.install").update({ with_sync = true })
			ts_update()
		end,
	})

	-- dadbod for Databases; not using for now
	--[[use({
		"kristijanhusak/vim-dadbod-ui",
		requires = { "tpope/vim-dadbod" },
	})
    --]]

	-- auto closing
	use("windwp/nvim-autopairs") -- autoclose parens, brackets, quotes, etc...
	use({
		"windwp/nvim-ts-autotag", -- autoclose tags
		requires = {
			"nvim-treesitter/nvim-treesitter",
		},
		config = function()
			require("nvim-ts-autotag").setup()
		end,
	})
	-- git integration
	use("lewis6991/gitsigns.nvim") -- show line modifications on left hand side

	-- nvim-formatter
	require("packer").use({ "mhartington/formatter.nvim" })

	-- toggle terminal
	use({
		"akinsho/toggleterm.nvim",
		tag = "*",
		config = function()
			require("toggleterm").setup({
				size = 15,
				direction = "horizontal",
				autochdir = false,
			})
		end,
	})

	-- Markdown Preview
	use({
		"iamcco/markdown-preview.nvim",
		run = "cd app && npm install",
		setup = function()
			vim.g.mkdp_filetypes = { "markdown" }
		end,
		ft = { "markdown" },
	})

	-- vimtex for LaTeX files
	use("lervag/vimtex")

	-- dap and dapui
	use({
		"rcarriga/nvim-dap-ui",
		requires = {
			"mfussenegger/nvim-dap",
			"nvim-neotest/nvim-nio",
		},
	})

	-- presenting in nvim
	use({
		"sotte/presenting.nvim",
		cmd = { "Presenting" },
		config = function()
			require("presenting").setup({
				-- fill in your options here
				-- see :help Presenting.config
			})
		end,
	})

	if packer_bootstrap then
		require("packer").sync()
	end
end)