local nvim_lsp = require('lspconfig')
local saga = require('lspsaga')

-- commands that don't exist in lua yet
vim.cmd [[
]]

-- general configuration
vim.opt.background = 'dark'		-- the theme background is dark
vim.opt.termguicolors = true

vim.opt.cursorline = true		-- highlight the line with the cursor
vim.opt.wrap = false			-- do not wrap long lines
vim.opt.foldmethod = 'marker'		-- when folding, use the marker
vim.opt.laststatus = 2			-- always show the status line
vim.opt.showtabline = 2			-- always show the tab bar
vim.opt.scrolloff = 2			-- number of lines to always have around cursor
vim.opt.splitright = true		-- vertical splits open on the right
vim.opt.splitbelow = true		-- horizontal splits open on the bottom
vim.g.mapleader = ' '			-- space is the leader character

-- Keybind: use '-' to open the file explorer
vim.api.nvim_set_keymap('n', '-', ':Ex<CR>', { noremap=true, silent=true })

-- Rainbow braket configuration
vim.g['rainbow_active'] = true

-- lsp saga improves the display of LSP information
saga.init_lsp_saga {
	error_sign = '',
	warn_sign = '',
	hint_sign = '',
	infor_sign = '',
	border_style = "round",
}

-- lsp configuration
local on_attach = function(client, bufnr)
	local function buf_set_keymap(...)
		vim.api.nvim_buf_set_keymap(bufnr, ...)
	end

	local opts = { noremap=true, silent=true }
	buf_set_keymap('n', 'gD', '<Cmd>lua vim.lsp.buf.declaration()<CR>', opts)
	buf_set_keymap('n', 'gd', '<Cmd>lua vim.lsp.buf.definition()<CR>', opts)
	buf_set_keymap('n', 'K', '<Cmd>Lspsaga hover_doc<CR>', opts)
	buf_set_keymap('n', 'C-K', '<Cmd>Lspsaga signature_help<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

-- attach the keymaps
-- lsp servers/languages configuration
require 'lspconfig'.rust_analyzer.setup {
	on_attach = on_attach
}

require 'lspconfig'.pyright.setup {
	on_attach = on_attach
}

-- treesitter
require 'nvim-treesitter.configs'.setup {
	ensure_installed = 'maintained',
	sync_install = false,
	highlight = {
		enable = true,
	},
}