-- LSP Configuration & Plugins
return {
	{
		"neovim/nvim-lspconfig",
		dependencies = {
			"williamboman/mason.nvim",
			"williamboman/mason-lspconfig.nvim",
			{
				"j-hui/fidget.nvim",
				tag = "legacy",
			},
			"folke/neodev.nvim",
			"RRethy/vim-illuminate",
			"nanotee/nvim-lsp-basics",
			"jose-elias-alvarez/null-ls.nvim",
		},
		config = function()
			-- Set up Mason before anything else
			require("mason").setup()
			require("mason-lspconfig").setup({
				ensure_installed = {
					"lua_ls",
				},
				automatic_installation = true,
			})

			-- Quick access via keymap
			require("helpers.keys").map("n", "<leader>M", "<cmd>Mason<cr>", "Show Mason")

			-- Neodev setup before LSP config
			require("neodev").setup()

			-- Turn on LSP status information
			require("fidget").setup()

			-- linter and formatter configurations
			local null_ls = require("null-ls")
			null_ls.setup({
				sources = {
					null_ls.builtins.formatting.prettier,
					null_ls.builtins.formatting.gofumpt,
					null_ls.builtins.formatting.goimports,
					null_ls.builtins.formatting.isort,
					null_ls.builtins.formatting.black.with({
						extra_args = { "-l 120" }
					}),
					null_ls.builtins.diagnostics.flake8.with({
						extra_args =  { "--max-line-length=120" }
					}),
					null_ls.builtins.formatting.rubocop,
					null_ls.builtins.formatting.rustfmt,
					null_ls.builtins.diagnostics.shellcheck,
					null_ls.builtins.formatting.stylua,
				}
			})

			-- Set up cool signs for diagnostics
			local signs = { Error = " ", Warn = " ", Hint = " ", Info = " " }
			for type, icon in pairs(signs) do
				local hl = "DiagnosticSign" .. type
				vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = "" })
			end

			-- Diagnostic config
			local config = {
				virtual_text = false,
				signs = {
					active = signs,
				},
				update_in_insert = true,
				underline = true,
				severity_sort = true,
				float = {
					focusable = true,
					style = "minimal",
					border = "rounded",
					source = "always",
					header = "",
					prefix = "",
				},
			}
			vim.diagnostic.config(config)

			-- This function gets run when an LSP connects to a particular buffer.
			local on_attach = function(client, bufnr)
				local basics = require("lsp_basics")
				basics.make_lsp_commands(client, bufnr)
				basics.make_lsp_mappings(client, bufnr)

				local lsp_map = require("helpers.keys").lsp_map
				lsp_map("<leader>lr", vim.lsp.buf.rename, bufnr, "Rename symbol")
				lsp_map("<leader>la", vim.lsp.buf.code_action, bufnr, "Code action")
				lsp_map("<leader>ld", vim.lsp.buf.type_definition, bufnr, "Type definition")
				lsp_map("<leader>ls", require("telescope.builtin").lsp_document_symbols, bufnr, "Document symbols")

				lsp_map("gd", vim.lsp.buf.definition, bufnr, "Goto Definition")
				lsp_map("gr", require("telescope.builtin").lsp_references, bufnr, "Goto References")
				lsp_map("gI", vim.lsp.buf.implementation, bufnr, "Goto Implementation")
				lsp_map("K", vim.lsp.buf.hover, bufnr, "Hover Documentation")
				lsp_map("gD", vim.lsp.buf.declaration, bufnr, "Goto Declaration")

				-- Create a command `:Format` local to the LSP buffer
				vim.api.nvim_buf_create_user_command(bufnr, "Format", function(_)
					vim.lsp.buf.format()
				end, { desc = "Format current buffer with LSP" })

				lsp_map("<leader>ff", "<cmd>Format<cr>", bufnr, "Format")

				-- Attach and configure vim-illuminate
				require("illuminate").on_attach(client)
			end

			local lspconfig = require("lspconfig")

			require("mason-lspconfig").setup_handlers({
				function(server_name)
					lspconfig[server_name].setup({
						on_attach = on_attach,
					})
				end,
				["lua_ls"] = function()
					lspconfig.lua_ls.setup({
						on_attach = on_attach,
						-- capabilities = capabilities,
						settings = {
							Lua = {
								completion = {
									callSnippet = "Replace",
								},
								diagnostics = {
									globals = { "vim" },
								},
								workspace = {
									library = {
										[vim.fn.expand("$VIMRUNTIME/lua")] = true,
										[vim.fn.stdpath("config") .. "/lua"] = true,
									},
								},
							},
						},
					})
				end
			})
		end,
	},
}