-- Helper for LÖVE pre-v12.
-- Download a thread before running the LÖVE app on the results.

if love.getVersion() >= 12 then
  https = require 'https'
end

## Getting started

## Getting started (LÖVE v11)

## Getting started (LÖVE v12 pre-release)
Install LÖVE from a nightly build.
* Go to https://github.com/love2d/love/actions
* Click on the most recent successful build (with a green check mark before it)
* Scroll down to the "Artifacts" section
* Download the artifact for your OS
    * If you don't have a Github account, these won't be clickable.
      Copy the URL for the build and paste it into https://nightly.link to get
      clickable links to artifacts.
Run LÖVE from the commandline and pass in this directory. Optionally also pass
in a link to a Mastodon toot.
Copy a link to any mastodon toot and paste it into the app window using
`ctrl+v` to view it in the context of its thread.

url_from_ml = function(ml)
	return ('%s/api/v1/statuses/%s'):format(ml.host, ml.id)
end

ml_from_url = function(url)
	local host, user, id = url:match('^([^/]*://[^/]*)/@([^/]*)/(%d*)$')
	if host then return {host=host, user=user, id=id} end
	local host, user, id = url:match('^([^/]*://[^/]*)/users/([^/]*)/statuses/(%d*)$')
	if host then return {host=host, user=user, id=id} end
end

Url = nil

try_load_nodes_from_url = function(initial_ml)
	local result = get_toot(initial_ml)
	if result.ancestors and #result.ancestors > 0 then
		-- redo with oldest ancestor
		result = get_toot(ml_from_url(result.ancestors[1].url))
	end
	return result
end

get_toot = function(ml)
	local url = url_from_ml(ml)
	local code, response, response_headers = https.request(url)
	local result = json.decode(response)
	code, response, response_headers = https.request(url..'/context')
	local rels = json.decode(response)
	result.host = ml.host
	result.user = ml.user
	result.id = ml.id
	result.ancestors = rels.ancestors
	result.descendants = rels.descendants
	return result
end

Input_filename = nil

-- file containing the thread to render
-- used only in LÖVE pre-v12 which didn't have https
-- only ever initialized once; pre-v12 LÖVE can't load new threads
Input_filename = nil

	if Input_filename then
		love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font
		local f = io.open(Input_filename)
		assert(f)
		local thread_data = json.decode(f:read('*a'))
		f:close()
		render_thread_to_surface(thread_data)

	if Major_version >= 12 then
		-- reload Url from network
		if Url then
			local initial_ml = ml_from_url(Url)
			local thread_data = try_load_nodes_from_url(initial_ml)
			render_thread_to_surface(thread_data)
			Cursor_node = Root
			if Nodes[initial_ml.id] then
				Cursor_node = Nodes[initial_ml.id]
			end
			ensure_cursor_node_within_viewport()
		end
		B()
	else
		-- LÖVE pre-v12 has no https
		-- reload same thread from file
		if Input_filename then
			love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font
			local f = io.open(Input_filename)
			assert(f)
			local thread_data = json.decode(f:read('*a'))
			f:close()
			render_thread_to_surface(thread_data)
		end
		B()

	B()

	elseif chord == 'C-v' then
		-- load new URL
		if Major_version >= 12 then  -- requires LÖVE with https
			-- ignore stuff in the clipboard that doesn't look like a url
			local cb = App.get_clipboard()
			if #cb > 300 then
				print('clipboard: '..cb:sub(1,300)..'...')
			else
				print('clipboard: '..cb)
			end
			if cb:match('^%s*https://[^%s]*%s*$') then
				print('clipboard contains a URL')
				Url = trim(cb)
				A()
			end
		end

end

end

	if #arg == 0 then
		error('Please pass in a file containing a Mastodon thread, and optionally an id within it to start out focused on.\n\nThis app currently needs to be invoked from a terminal.')
	end
	Input_filename = arg[1]
	A()
	Cursor_node = Root
	if #arg >= 2 then
		local initial_id = arg[2]
		if Nodes[initial_id] then
			Cursor_node = Nodes[initial_id]

	if Major_version >= 12 then
		-- LÖVE has https
		-- commandline arg is a url
		if #arg > 0 then
			Url = arg[1]
			A()
		end
	else
		-- LÖVE pre-v12 doesn't have https
		-- we depend on an external shim to download
		-- commandline arg is a filename
		if #arg == 0 then
			-- no ability to load new URL
			error('When running with LÖVE v11, please pass in a file containing a Mastodon thread, and optionally an id within it to start out focused on.\n\nThis app currently needs to be invoked from a terminal.')
		end
		Input_filename = arg[1]
		A()
		Cursor_node = Root
		if #arg >= 2 then
			local initial_id = arg[2]
			if Nodes[initial_id] then
				Cursor_node = Nodes[initial_id]
			end

		ensure_cursor_node_within_viewport()

	ensure_cursor_node_within_viewport()