---@module 'snacks'

local data = require("javelin.data")
local log = require("javelin.log")

local UI = {}

---@type JavelinConfig
local options

local function open_buf(file)
	-- nvim 0.11 only command
	if vim.fn.exists("*isabsolutepath") == 1 then
		if vim.fn.isabsolutepath(file) == 0 then
			file = data.get_root() .. "/" .. file
		end
	else
		if file:sub(1, 1) ~= "/" and file:sub(1, 1) ~= "~" then
			file = data.get_root() .. "/" .. file
		end
	end

	local bufnr = vim.fn.bufadd(vim.fn.expand(file))
	vim.fn.bufload(bufnr)
	vim.api.nvim_set_option_value("buflisted", true, {
		buf = bufnr,
	})
	vim.api.nvim_set_current_buf(bufnr)
end

---@param index number
function UI.select(index)
	local file = data.get_current()[index]
	if file ~= nil then
		open_buf(file)
	end
end

function UI.open()
	local root = data.get_root()
	local initial_text = data.get_list(root)
	Snacks.win.new({
		text = initial_text,
		title = root,
		title_pos = options.menu.title_pos,
		width = options.menu.width,
		height = options.menu.height,
		border = options.menu.border,
		keys = options.menu.keys,
		fixbuf = true,
		wo = {
			number = true,
		},
		bo = {
			modifiable = true,
			readonly = false,
			buftype = "nofile",
			bufhidden = "wipe",
		},
		actions = {
			["goto"] = function(self)
				local file = vim.api.nvim_get_current_line()
				self:close()
				open_buf(file)
			end,
		},
		on_buf = function(self)
			vim.api.nvim_create_autocmd("BufLeave", {
				buffer = self.buf,
				callback = function()
					if not self.closed then
						self:close()
					end
					return true
				end,
			})
		end,
		on_close = function(self)
			if self.buf then
				local lines = self:lines()
				if #lines == 1 and lines[1] == "" then
					lines = {}
				end
				if not vim.deep_equal(initial_text, lines) then
					data.update(root, self:lines())
					log.info("Javelin updated.")
				end
			else
				log.error("No buf on win")
			end
		end,
	})
end

function UI.setup(opt)
	options = opt
end

return UI