local fn = vim.fn

-- boostrap packer
local install_path = fn.stdpath('data')..'/site/pack/packer/opt/packer.nvim'
local packer_bootstrap
if fn.empty(fn.glob(install_path)) > 0 then
	packer_bootstrap = fn.system({'git', 'clone','https://github.com/wbthomason/packer.nvim', install_path})
end

-- run PackerSync everytime plugins.lua is updated
vim.cmd([[
  augroup packer_user_config
    autocmd!
    autocmd BufWritePost plugins.lua source <afile> | PackerSync
  augroup end
]])

vim.cmd([[packadd packer.nvim]])

-- initialize plugins
return require('packer').startup(function(use)
	-- let packer manage itself
	use({'wbthomason/packer.nvim', opt = true})

	-- theme
    use("ishan9299/nvim-solarized-lua")

    -- commenting
    use("tpope/vim-commentary")

	-- session handling
	use('tpope/vim-obsession')
	use('dhruvasagar/vim-prosession')

	-- status line
	use {
		'nvim-lualine/lualine.nvim',
		requires = { 'kyazdani42/nvim-web-devicons', opt = true },
		config = function()
			require('lualine').setup()
		end
	}

	-- tabline
	use {
		'kdheepak/tabline.nvim',
		config = function()
			require'tabline'.setup {
				enable = true,
				options = {
					show_filename_only = true,
				}
			}
		end,
		requires = { { 'hoob3rt/lualine.nvim' }, {'kyazdani42/nvim-web-devicons', opt = true} }
	}

	-- blankline
	use({
		"lukas-reineke/indent-blankline.nvim",
		config = function ()
			require("indent_blankline").setup {
				char = "┊",
				buftype_exclude = {"terminal", "help"}
			}
		end
	})

	-- git
	use('tpope/vim-fugitive')
	use ({
		'lewis6991/gitsigns.nvim',
		requires = {'nvim-lua/plenary.nvim'},
		config = function() require('gitsigns').setup() end
	})

	-- autocompletion
	use({
		"ms-jpq/coq_nvim",
		branch="coq",
		requires = {
		{'ms-jpq/coq.artifacts', branch = 'artifacts'},
		},
	})

    -- highlight current symbol
    use({
        "nvim-treesitter/nvim-treesitter-refactor",
        config = function () require("nvim-treesitter.configs").setup({
            refactor = {
                highlight_definitions = {
                    enable = true,
                    clear_on_cursor_move = true,
                },
            }
        })
        end,
    })

	-- language server
	use({
		"neovim/nvim-lspconfig",
		config = function() require("plugins.lspconfig") end,
	})

    use('williamboman/nvim-lsp-installer')

	-- treesitter
	use({
		'nvim-treesitter/nvim-treesitter',
		config = function() require('plugins.treesitter') end,
		run = ':TSUpdate'
	})

	-- Telescope
	use({
		'nvim-telescope/telescope.nvim',
		requires = {{'nvim-lua/plenary.nvim'}},
		config = function() require('plugins.telescope') end,
	})

    -- markdown preview
    use({'iamcco/markdown-preview.nvim'})

    -- terminal
    use({
        "akinsho/nvim-toggleterm.lua",
        config = function()
            require("toggleterm").setup({
                size = 32,
                open_mapping = [[<F4>]],
            })
        end,
    })

    -- auto-close brackets
    use({
        "windwp/nvim-autopairs",
        config = function ()
            require("nvim-autopairs").setup({})
        end,
    })

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