-- SPDX-License-Identifier: MIT
--
-- Copyright (c) 2026 Mikołaj Kozłowski
--
-- Portions of this file are derived from:
-- prichrd/netrw.nvim (MIT)
-- https://github.com/prichrd/netrw.nvim

local M = {}

M.TYPE_DIR = 0
M.TYPE_FILE = 1
M.TYPE_EXE = 2
M.TYPE_SYMLINK = 3

---@alias rwNode{name:string, icon:number, type:number}

-- ---@param line string
-- ---@param curdir string
-- ---@return rwNode|nil
-- local parse_liststyle_0 = function(line, curdir)
-- 	local _, _, node, link = string.find(line, "^(.+)@\t%s*%-%->%s*(.+)")
-- 	if node then
-- 		return {
-- 			dir = curdir,
-- 			icon_col = 0,
-- 			name_col = 0,
-- 			lsp_col = #node,
-- 			node = node,
-- 			extension = vim.fn.fnamemodify(node, ":e"),
-- 			link = link,
-- 			type = M.TYPE_SYMLINK,
-- 		}
-- 	end
--
-- 	local _, _, dir = string.find(line, "^(.*)/")
-- 	if dir then
-- 		return {
-- 			dir = curdir,
-- 			icon_col = 0,
-- 			name_col = 0,
-- 			lsp_col = #dir + 1, -- +1 for the "/"
-- 			node = dir,
-- 			type = M.TYPE_DIR,
-- 		}
-- 	end
--
-- 	local ext = vim.fn.fnamemodify(line, ":e")
-- 	local clean_line = line
-- 	if string.sub(ext, -1) == "*" then
-- 		ext = string.sub(ext, 1, -2)
-- 		clean_line = string.sub(line, 1, -2)
-- 	end
--
-- 	return {
-- 		dir = curdir,
-- 		icon_col = 0,
-- 		name_col = 0,
-- 		lsp_col = #clean_line,
-- 		node = clean_line,
-- 		extension = ext,
-- 		type = M.TYPE_FILE,
-- 	}
-- end
--
-- ---@param line string
-- ---@param curdir string
-- ---@return rwNode|nil
-- local parse_liststyle_1 = function(line, curdir)
-- 	local _, _, node, link = string.find(line, "^(.+)@%s+")
-- 	if node then
-- 		return {
-- 			dir = curdir,
-- 			icon_col = 0,
-- 			name_col = 0,
-- 			lsp_col = #node,
-- 			node = node,
-- 			extension = vim.fn.fnamemodify(node, ":e"),
-- 			link = link,
-- 			type = M.TYPE_SYMLINK,
-- 		}
-- 	end
--
-- 	local _, _, dir = string.find(line, "^(.*)/")
-- 	if dir then
-- 		return {
-- 			dir = curdir,
-- 			icon_col = 0,
-- 			name_col = 0,
-- 			lsp_col = #dir + 1,
-- 			node = dir,
-- 			type = M.TYPE_DIR,
-- 		}
-- 	end
--
-- 	local file = vim.fn.substitute(line, "^\\(\\%(\\S\\+ \\)*\\S\\+\\).\\{-}$", "\\1", "e")
-- 	local ext = vim.fn.fnamemodify(file, ":e")
-- 	if string.sub(ext, -1) == "*" then
-- 		ext = string.sub(ext, 1, -2)
-- 		file = string.sub(file, 1, -2)
-- 	end
--
-- 	return {
-- 		dir = curdir,
-- 		icon_col = 0,
-- 		name_col = 0,
-- 		lsp_col = #file,
-- 		node = file,
-- 		extension = ext,
-- 		type = M.TYPE_FILE,
-- 	}
-- end

---@param line string
---@return rwNode|nil
local parse_liststyle_3 = function(line)
	local current_dir = vim.b.netrw_curdir;
	local type = M.TYPE_FILE;

	local _, tree_end = string.find(line, "^[|%s]*");

	local content = string.sub(line, tree_end + 1, #line);
	if content == "" then
		return nil;
	end

	local name = content;

	if name:sub(-1) == "*" then
		type = M.TYPE_EXE;
	end

	local _, _, link, link_target = string.find(content, "^(.+)@\t%s*%-%->%s*(.+)")
	if link then
		type = M.TYPE_SYMLINK;
		name = link_target;
	end

	local _, _, dir = string.find(content, "^(.*)/")
	if dir then
		type = M.TYPE_DIR;
	end

	return {
		name = name,
		icon = tree_end,
		type = type,
	}
end

---@param line string
---@return rwNode|nil
M.get_node = function(line)
	if string.find(line, '^"') then return nil end
	if line == "" then return nil end

	local liststyle = vim.b.netrw_liststyle

	if liststyle == 3 then
		return parse_liststyle_3(line)
	end

	return nil
end

return M