-- Create the module table
local M = {}

-- Default configuration
local defaults = {
	filetypes = { "markdown", "text", "norg" }, -- Filetypes to activate the plugin for
}

-- Internal function to set up buffer-local keymaps
local function setup_buffer_keymaps()
	-- add new todo line when previous is already a todo
	local function press_enter()
		local current_line = vim.api.nvim_get_current_line()
		local index, spaces = string.find(current_line, "^%s*")

		-- Check if the current line matches the pattern
		local pattern = "^%- %[[ x]%] .*$"
		local match = string.match(current_line, pattern)

		if match then
			if string.len(current_line) >= 7 then
				vim.api.nvim_feedkeys("\n- [ ] ", "n", true)
			else
				-- go to normal mode before removing the content of the line
				vim.api.nvim_feedkeys(vim.api.nvim_eval('"\\<esc>"'), "n", true)
				vim.api.nvim_feedkeys("_", "n", true)
				vim.api.nvim_feedkeys("C", "n", true)
				vim.api.nvim_feedkeys("\n", "n", true)
				-- vim.api.nvim_set_current_line("")
			end
		else
			vim.api.nvim_feedkeys("\n", "n", true)
		end
	end

	-- indent line if tab is pressed when line is a todo
	local function press_tab()
		local current_line = vim.api.nvim_get_current_line()

		-- Check if current line matches the patterns
		local openpattern = "%- %[[ ]%]"
		local closedpattern = "%- %[[x]%]"

		if string.match(current_line, openpattern) or string.match(current_line, closedpattern) then
			print("tab pressed, allegedly")
			vim.api.nvim_feedkeys("C-t", "i", true)
		end
	end

	-- indent line if shift tab is pressed when line is a todo
	local function press_shift_tab()
		local current_line = vim.api.nvim_get_current_line()

		-- Check if current line matches the patterns
		local openpattern = "%- %[[ ]%]"
		local closedpattern = "%- %[[x]%]"

		if string.match(current_line, openpattern) or string.match(current_line, closedpattern) then
			print("shift tab pressed, allegedly")
			vim.api.nvim_feedkeys("C-d", "i", true)
		end
	end

	-- function that checks if the current line starts with the string "- [ ]" or "- [x]" and toggles the x
	local function toggle_todo()
		local openpattern = "%- %[[ ]%]"
		local closedpattern = "%- %[[x]%]"
		local titleopenpattern = "# %[[ ]%]"
		local titleclosedpattern = "# %[[x]%]"

		local line = vim.api.nvim_get_current_line()

		if string.match(line, openpattern) then
			line = string.gsub(line, openpattern, "- [x]")
			vim.api.nvim_set_current_line(line)
		elseif string.match(line, closedpattern) then
			line = string.gsub(line, closedpattern, "- [ ]")
			vim.api.nvim_set_current_line(line)
		elseif string.match(line, titleopenpattern) then
			line = string.gsub(line, titleopenpattern, "# [x]")
			vim.api.nvim_set_current_line(line)
		elseif string.match(line, titleclosedpattern) then
			line = string.gsub(line, titleclosedpattern, "# [ ]")
			vim.api.nvim_set_current_line(line)
		end
	end

	-- function that checks if the current line doesn't start with the string "- [ ] " and, if it doesn't, adds the string at the beginning of the line
	local function add_todo()
		local openpattern = "^%s*%- %[[ ]%]"
		local closedpattern = "^%s*%- %[[x]%]"

		local line = vim.api.nvim_get_current_line()
		local index, spaces = string.find(line, "^%s*")

		if index == 1 and not string.match(line, openpattern) and not string.match(line, closedpattern) then
			if index == 1 and spaces == 0 then
				line = "- [ ] " .. line
				vim.api.nvim_set_current_line(line)
				vim.api.nvim_feedkeys("A", "n", true)
			elseif index == 1 and spaces > 0 then
				local trimedline = string.sub(line, spaces + 1)
				local spacestring = ""
				for x = 1, spaces, 1 do
					spacestring = spacestring .. " "
				end
				line = spacestring .. "- [ ] " .. trimedline
				vim.api.nvim_set_current_line(line)
			end
		end
	end

	-- function that checks if the current line starts with the string "- [ ]" or "- [x]" and, if it does, removes that string from the line
	local function remove_todo()
		local openpattern = "%- %[[ ]%]"
		local closedpattern = "%- %[[x]%]"
		local line = vim.api.nvim_get_current_line()
		-- local index, spaces = string.find(line, "^%s*")

		if string.match(line, openpattern) or string.match(line, closedpattern) then
			print("encontrado")
			line = string.gsub(line, openpattern, "")
			line = string.gsub(line, closedpattern, "")
			vim.api.nvim_set_current_line(line)
		end
	end

	-- Set up buffer-local keymaps
	-- Use buffer = 0 to target the current buffer
	local map_opts = { noremap = true, silent = true, buffer = 0 }
	local expr_map_opts = { noremap = true, expr = true, silent = true, buffer = 0 }

	vim.keymap.set("n", "<leader>t", function() end, { desc = "+TODOs", buffer = 0 }) -- Placeholder, keep silent=false if needed
	vim.keymap.set("i", "<CR>", press_enter, { desc = "Todoer: Handle Enter", expr = true, buffer = 0 }) -- Keep expr=true, noremap=true is default
	vim.keymap.set("i", "<TAB>", press_tab, { desc = "Todoer: Handle Tab", expr = true, buffer = 0 }) -- Keep expr=true
	vim.keymap.set("i", "<S-Tab>", press_shift_tab, { desc = "Todoer: Handle Shift-Tab", expr = true, buffer = 0 }) -- Keep expr=true
	vim.keymap.set("n", "<leader>tt", toggle_todo, { desc = "Todoer: Toggle TODO", buffer = 0 })
	vim.keymap.set("n", "<leader>ta", add_todo, { desc = "Todoer: Add TODO", buffer = 0 })
	vim.keymap.set("n", "<leader>td", remove_todo, { desc = "Todoer: Remove TODO", buffer = 0 })

	-- Optional: Notify that keymaps are set for this buffer
	-- vim.notify("Todoer keymaps activated for this buffer", vim.log.levels.INFO)
end

-- Setup function: Called by the user in their config
function M.setup(opts)
	-- Merge user options with defaults
	local config = vim.tbl_deep_extend("force", {}, defaults, opts or {})

	-- Create an autocommand group to ensure we can clear it later if needed
	local group = vim.api.nvim_create_augroup("TodoerUserSetup", { clear = true })

	-- Create the autocommand
	vim.api.nvim_create_autocmd("FileType", {
		group = group,
		pattern = config.filetypes, -- Use filetypes from config
		desc = "Setup Todoer keymaps for specific filetypes",
		callback = function()
			-- Call the function that sets up buffer-local keymaps
			setup_buffer_keymaps()
		end,
	})
end

-- Return the module table
return M