local M = {}

function M.on_attach(_, bufnr)
	-- we create a function that lets us more easily define mappings specific
	-- for LSP related items. It sets the mode, buffer and description for us each time.

	local nmap = function(keys, func, desc)
		if desc then
			desc = "LSP: " .. desc
		end

		vim.keymap.set("n", keys, func, { buffer = bufnr, desc = desc })
	end

	nmap("<leader>rn", vim.lsp.buf.rename, "[R]e[n]ame")
	nmap("<leader>ca", vim.lsp.buf.code_action, "[C]ode [A]ction")

	nmap("gd", vim.lsp.buf.definition, "[G]oto [D]efinition")

	-- NOTE: why are these functions that call the telescope builtin?
	-- because otherwise they would load telescope eagerly when this is defined.
	-- due to us using the on_require handler to make sure it is available.
	if nixCats("general.telescope") then
		nmap("gr", function()
			require("telescope.builtin").lsp_references()
		end, "[G]oto [R]eferences")
		nmap("gI", function()
			require("telescope.builtin").lsp_implementations()
		end, "[G]oto [I]mplementation")
		nmap("<leader>ds", function()
			require("telescope.builtin").lsp_document_symbols()
		end, "[D]ocument [S]ymbols")
		nmap("<leader>ws", function()
			require("telescope.builtin").lsp_dynamic_workspace_symbols()
		end, "[W]orkspace [S]ymbols")
		nmap("<leader>dd", "<cmd>Telescope diagnostics bufnr=0<CR>", "[D]ocument [D]iagnostics")
		nmap("<leader>wd", "<cmd>Telescope diagnostics<CR>", "[W]orkspace [D]iagnostics")
	end -- TODO: someone who knows the builtin versions of these to do instead help me out please.

	nmap("<leader>D", vim.lsp.buf.type_definition, "Type [D]efinition")
	nmap("<leader>e", vim.diagnostic.open_float, "Show [E]rror")

	-- See `:help K` for why this keymap
	nmap("K", vim.lsp.buf.hover, "Hover Documentation")
	nmap("<C-k>", vim.lsp.buf.signature_help, "Signature Documentation")

	-- Lesser used LSP functionality
	nmap("gD", vim.lsp.buf.declaration, "[G]oto [D]eclaration")
	nmap("<leader>wa", vim.lsp.buf.add_workspace_folder, "[W]orkspace [A]dd Folder")
	nmap("<leader>wr", vim.lsp.buf.remove_workspace_folder, "[W]orkspace [R]emove Folder")
	nmap("<leader>wl", function()
		print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
	end, "[W]orkspace [L]ist Folders")

	-- 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" })
end

function M.get(server_name)
	local capabilities = require("blink.cmp").get_lsp_capabilities()

	return capabilities
end
return M