vim.cmd [[packadd packer.nvim]]

return require('packer').startup(function() 
	-- packer
	use 'wbthomason/packer.vim'

	-- lspconfig
	use {
		'neovim/nvim-lspconfig',
		config = function()
			local attachment = function(client, bufnr)
				local opts = { noremap=true, silent=true }
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gr', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'ga', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>f', '<cmd>lua vim.lsp.buf.format({async = true})<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'ge', '<cmd>lua vim.diagnostic.open_float()<CR>', opts)
				vim.api.nvim_buf_set_keymap(bufnr, 'n', 'gn', '<cmd>lua vim.diagnostic.goto_next()<CR>', opts)

				if client.resolved_capabilities.document_formatting then
					vim.api.nvim_command [[augroup Format]]
					vim.api.nvim_command [[autocmd! * <buffer>]]
					vim.api.nvim_command [[autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting_seq_sync()]]
					vim.api.nvim_command [[augroup END]]
				end
			end

			local servers = { 'pyright', 'rust_analyzer', 'clangd' }
			for _, lsp in pairs(servers) do
				require('lspconfig')[lsp].setup {
					on_attach = attachment
				}
			end
		end,
	}

	-- treesitter
	use {
		'nvim-treesitter/nvim-treesitter',
		config = function()
			require('nvim-treesitter.configs').setup {
				ensure_installed = { "python", "rust" },
				sync_install = false,
				highlight = {
					enable = true,
				},
			}
		end,
	}

	-- status line
	use {
		'nvim-lualine/lualine.nvim',
		config = function()
			require('lualine').setup {
				options = {
					icons_enabled = true,
					-- theme = 'ayu_dark',
					theme = 'ayu_mirage',
					component_separators = { left = '', right = '' },
					section_separators = { left = '', right = '' },
					disabled_filetypes = {},
					always_divide_middle = true,
				},
				sections = {
					lualine_a = {'mode'},
					lualine_b = {'filename', 'branch'},
					lualine_c = {
						{
							'diagnostics',
							symbols = {error = 'Errors:', warn = 'Warns:', info = 'Info:', hint = 'Hints:'},
							sources = { 'nvim_diagnostic' }
						}
					},
					lualine_w = {'encoding'},
					lualine_x = {'filetype'},
					lualine_y = {'progress'},
					lualine_z = {'location'}
				},
				inactive_sections = {
					lualine_a = {},
					lualine_b = {},
					lualine_c = {'filename'},
					lualine_x = {'location'},
					lualine_y = {},
					lualine_z = {}
				},
				tabline = {
					lualine_a = {'tabs'},
					lualine_b = {},
					lualine_c = {},
					lualine_x = {},
					lualine_y = {},
					lualine_z = {}
				},
				extensions = {}
			}
		end
	}

	use {
		'nvim-telescope/telescope.nvim',
		requires = { {'nvim-lua/plenary.nvim'} },
		config = function() 
			vim.api.nvim_set_keymap('n', '<leader><space>', '<cmd>Telescope find_files<CR>', { noremap = true, silent = true })
			vim.api.nvim_set_keymap('n', '<leader>g', '<cmd>Telescope live_grep<CR>', { noremap = true, silent = true })
		end,
	}

	use 'windwp/nvim-autopairs'
end)