-- 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

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

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

-- lsp configuration
local nvim_lsp = require('lspconfig')
local function buf_set_keymap(...)
	vim.api.nvim_buf_set_keymap(bufnr, ...)
end
local opts = { noremap=true, silent=true }

local on_attach = function(client, bufnr)
	-- let's use the lsp filetype attach to set buffer (and window) options
	vim.bo.expandtab = true
	vim.bo.tabstop = 4
	vim.bo.shiftwidth = 4
	vim.bo.softtabstop = 4
	vim.bo.textwidth = 79

	vim.wo.number = true
	vim.wo.colorcolumn = '80'

	vim.diagnostic.config({signs = false})

	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', 'gF', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
	buf_set_keymap('n', 'gR', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
	buf_set_keymap('n', 'g?', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
	buf_set_keymap('n', 'gp', '<cmd>lua vim.lsp.buf.completion()<CR>', opts)
	buf_set_keymap('n', 'ge', '<cmd>lua vim.diagnostic.open_float()<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
nvim_lsp.rust_analyzer.setup {
	on_attach = on_attach
}

nvim_lsp.pyright.setup {
	on_attach = on_attach
}

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

-- lualine (better statusline)
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 = {'branch'},
		lualine_c = {
			{
				'diagnostics',
				symbols = {error = 'E', warn = 'W', info = 'I', hint = 'H'},
			}
		},
		lualine_d = {'filename'},
		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 = {},
		lualine_b = {'filename'},
		lualine_c = {},
		lualine_x = {},
		lualine_y = {},
		lualine_z = {'tabs'}
	},
	extensions = {}
}