local M = {}

-- debounce_text_changes = delay, between changing something and lsp updating
M.flags = { debounce_text_changes = 150 }

local general_settings = { }
M.server_settings = {
	sumneko_lua = {
		Lua = {
			runtime = {
				-- Tell the language server which version of Lua you're using (most likely LuaJIT in the case of Neovim)
				version = 'LuaJIT',
				-- Setup your lua path
				path = vim.split(package.path, ';')
			},
			diagnostics = {
				-- Get the language server to recognize the `vim` global
				globals = {'vim', 'packer_plugins'}
			},
			workspace = {
				-- Make the server aware of Neovim runtime files
				library = vim.api.nvim_get_runtime_file("", true)
			},
			telemetry = { enable = false }
		}
	}
}

-- Apply general settings for each server
for _, settings in ipairs(M.server_settings) do
	M.server_settings = vim.tbl_deep_extend("keep", settings, general_settings)
end

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
---@diagnostic disable-next-line: unused-local
function M.on_attach(client, bufnr)
  -- Mappings.
  local opts = { noremap = true, silent = true }

  local function buf_set_keymap(mode, lhs, rhs) vim.api.nvim_buf_set_keymap(bufnr, mode, lhs, rhs, opts) end
  local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end

  -- Enable completion triggered by <c-x><c-o>
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- See `:help vim.lsp.*` for documentation on any of the below functions
  buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>')
  buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>')
  buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>')
  buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>')
  buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>')

	-- Conflicts with movement between panes
  -- buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>')

  -- buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>')
  -- buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>')
  -- buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>')
  -- buf_set_keymap('n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>')
  buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>')
  buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>')
  buf_set_keymap('n', '<space>d', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>')
  -- buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>')
  -- buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>')
  -- buf_set_keymap('n', '<space>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>')
  buf_set_keymap('n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>')

	-- " auto-format
	-- autocmd BufWritePre *.js lua vim.lsp.buf.formatting_sync(nil, 100)
	-- autocmd BufWritePre *.jsx lua vim.lsp.buf.formatting_sync(nil, 100)
	-- autocmd BufWritePre *.py lua vim.lsp.buf.formatting_sync(nil, 100)
end

function M.get_capabilities()
	local capabilities = vim.lsp.protocol.make_client_capabilities()

	if packer_plugins['cmp-nvim-lsp'] and packer_plugins['cmp-nvim-lsp'].loaded then
		capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)
	end

	return capabilities
end

function M.on_init(initialize_params, config)
	-- print("lsp init")
end

function M.get_server_settings(name)
	return M.server_settings[name]
end

---@diagnostic disable-next-line: empty-block
if packer_plugins['nvim-lsp-installer'] and packer_plugins['nvim-lsp-installer'].loaded then
	-- local lspconfig = require('lspconfig')
	-- TODO: Manually do "server:setup{}" if lspinstaller is not loaded
end

return M