--------------------------------------------------
--     ____                                     --
--    / __ \________  ________  ____  ________  --
--   / /_/ / ___/ _ \/ ___/ _ \/ __ \/ ___/ _ \ --
--  / ____/ /  /  __(__  )  __/ / / / /__/  __/ --
-- /_/   /_/   \___/____/\___/_/ /_/\___/\___/  --
--                                              --
--   Discord Rich Presence plugin for Neovim.   --
--------------------------------------------------
--
-- Nvim peer-to-peer runtime state shape example:
--
-- Presence = {
--     id = "ee1fc18f-2c81-4b88-b92e-cb801fbe8d85",
--     workspace = "/Users/user/Code/presence.nvim",
--     socket = "/var/folders/mm/8qfxwcdn29s8d_rzmj7bqxb40000gn/T/nvim9pEtTD/0",
--
--     -- Last activity set by current client or any peer instance
--     last_activity = {
--         file = "/Users/user/Code/presence.nvim/README.md",
--         workspace = "/Users/user/Code/presence.nvim",
--         set_at = 1616033523,
--     },
--
--     -- Other remote Neovim instances (peers)
--     peers = {
--         ["dd5eeafe-8d0d-44d7-9850-45d3884be1a0"] = {
--             workspace = "/Users/user/Code/presence.nvim",
--             socket = "/var/folders/mm/8qfxwcdn29s8d_rzmj7bqxb40000gn/T/nvim9pEtTD/0",
--         },
--         ["346750e6-c416-44ff-98f3-eb44ea2ef15d"] = {
--             workspace = "/Users/user/Code/presence.nvim",
--             socket = "/var/folders/mm/8qfxwcdn29s8d_rzmj7bqxb40000gn/T/nvim09n664/0",
--         }
--     },
--
--     -- Workspace states across all peers
--     workspaces = {
--         ["/Users/user/Code/dotfiles"] = {
--             started_at = 1616033505,
--             updated_at = 1616033505
--         },
--         ["/Users/user/Code/presence.nvim"] = {
--             started_at = 1616033442,
--             updated_at = 1616033523
--         },
--     },
--
--     ... other methods and member variables
-- }
--
local Presence = {}
Presence.is_authorized = false
Presence.is_authorizing = false
Presence.is_connected = false
Presence.is_connecting = false
Presence.last_activity = {}
Presence.peers = {}
Presence.socket = vim.v.servername
Presence.workspace = nil
Presence.workspaces = {}

local log = require("lib.log")
local msgpack = require("deps.msgpack")
local serpent = require("deps.serpent")
local file_explorers = require("presence.file_explorers")
local default_file_assets = require("presence.file_assets")
local plugin_managers = require("presence.plugin_managers")
local Discord = require("presence.discord")

function Presence:setup(...)
	-- Support setup invocation via both dot and colon syntax.
	-- To maintain backwards compatibility, colon syntax will still
	-- be supported, but dot syntax should be recommended.
	local args = { ... }
	local options = args[1]
	if #args == 0 then
		options = self
		self = Presence
	end

	options = options or {}
	self.options = options

	-- Initialize logger
	self:set_option("log_level", nil, false)
	self.log = log:init({ level = options.log_level })

	-- Get operating system information including path separator
	-- http://www.lua.org/manual/5.3/manual.html#pdf-package.config
	local uname = vim.loop.os_uname()
	local separator = package.config:sub(1, 1)
	local wsl_distro_name = os.getenv("WSL_DISTRO_NAME")
	local os_name = self.get_os_name(uname)
	self.os = {
		name = os_name,
		is_wsl = uname.release:lower():find("microsoft") ~= nil,
		path_separator = separator,
	}

	-- Print setup message with OS information
	local setup_message_fmt = "Setting up plugin for %s"
	if self.os.name then
		local setup_message = self.os.is_wsl
				and string.format(setup_message_fmt .. " in WSL (%s)", self.os.name, vim.inspect(wsl_distro_name))
			or string.format(setup_message_fmt, self.os.name)
		self.log:debug(setup_message)
	else
		self.log:error(string.format("Unable to detect operating system: %s", vim.inspect(vim.loop.os_uname())))
	end

	-- Use the default or user-defined client id if provided
	if options.client_id then
		self.log:info("Using user-defined Discord client id")
	end

	-- General options
	self:set_option("auto_update", 1)
	self:set_option("client_id", "1172122807501594644")
	self:set_option("debounce_timeout", 10)
	self:set_option("neovim_image_text", "The One True Text Editor")
	self:set_option("main_image", "neovim")
	self:set_option("enable_line_number", false)
	-- Status text options
	self:set_option("editing_text", "Editing %s")
	self:set_option("file_explorer_text", "Browsing %s")
	self:set_option("git_commit_text", "Committing changes")
	self:set_option("plugin_manager_text", "Managing plugins")
	self:set_option("reading_text", "Reading %s")
	self:set_option("workspace_text", "Working on %s")
	self:set_option("line_number_text", "Line %s out of %s")
	self:set_option("blacklist", {})
	self:set_option("buttons", true)
	self:set_option("show_time", true)
	-- File assets options
	self:set_option("file_assets", {})
	for name, asset in pairs(default_file_assets) do
		if not self.options.file_assets[name] then
			self.options.file_assets[name] = asset
		end
	end

	-- Get and check discord socket path
	local discord_socket_path = self:get_discord_socket_path()
	if discord_socket_path then
		self.log:debug(string.format("Using Discord IPC socket path: %s", discord_socket_path))
		self:check_discord_socket(discord_socket_path)
	else
		self.log:error("Failed to determine Discord IPC socket path")
	end

	-- Initialize discord RPC client
	self.discord = Discord:init({
		logger = self.log,
		client_id = options.client_id,
		ipc_socket = discord_socket_path,
	})

	-- Seed instance id using unique socket path
	local seed_nums = {}
	self.socket:gsub(".", function(c)
		table.insert(seed_nums, c:byte())
	end)
	self.id = self.discord.generate_uuid(tonumber(table.concat(seed_nums)) / os.clock())
	self.log:debug(string.format("Using id %s", self.id))

	-- Ensure auto-update config is reflected in its global var setting
	vim.api.nvim_set_var("presence_auto_update", options.auto_update)

	-- Set autocommands
	vim.fn["presence#SetAutoCmds"]()

	self.log:info("Completed plugin setup")

	-- Set global variable to indicate plugin has been set up
	vim.api.nvim_set_var("presence_has_setup", 1)

	-- Register self to any remote Neovim instances
	self:register_self()

	return self
end

-- Normalize the OS name from uname
function Presence.get_os_name(uname)
	if uname.sysname:find("Windows") or uname.sysname:find("MINGW") then
		return "windows"
	elseif uname.sysname:find("Darwin") then
		return "macos"
	elseif uname.sysname:find("Linux") then
		return "linux"
	end

	return "unknown"
end

-- To ensure consistent option values, coalesce true and false values to 1 and 0
function Presence.coalesce_option(value)
	if type(value) == "boolean" then
		return value and 1 or 0
	end

	return value
end

-- Set option using either vim global or setup table
function Presence:set_option(option, default, validate)
	default = self.coalesce_option(default)
	validate = validate == nil and true or validate

	local g_variable = string.format("presence_%s", option)

	self.options[option] = self.coalesce_option(self.options[option])

	if validate then
		-- Warn on any duplicate user-defined options
		self:check_dup_options(option)
	end

	self.options[option] = self.options[option] or vim.g[g_variable] or default
end

-- Check and warn for duplicate user-defined options
function Presence:check_dup_options(option)
	local g_variable = string.format("presence_%s", option)

	if self.options[option] ~= nil and vim.g[g_variable] ~= nil then
		local warning_fmt = "Duplicate options: `g:%s` and setup option `%s`"
		local warning_msg = string.format(warning_fmt, g_variable, option)

		self.log:warn(warning_msg)
	end
end

-- Check the Discord socket at the given path
function Presence:check_discord_socket(path)
	self.log:debug(string.format("Checking Discord IPC socket at %s...", path))

	-- Asynchronously check socket path via stat
	vim.loop.fs_stat(path, function(err, stats)
		if err then
			local err_msg = "Failed to get socket information"
			self.log:error(string.format("%s: %s", err_msg, err))
			return
		end

		if stats.type ~= "socket" then
			local warning_msg = "Found unexpected Discord IPC socket type"
			self.log:warn(string.format("%s: %s", warning_msg, err))
			return
		end

		self.log:debug("Checked Discord IPC socket, looks good!")
	end)
end

-- Send a nil activity to unset the presence
function Presence:cancel()
	self.log:debug("Canceling Discord presence...")

	if not self.discord:is_connected() then
		return
	end

	self.discord:set_activity(nil, function(err)
		if err then
			self.log:error(string.format("Failed to cancel activity in Discord: %s", err))
			return
		end

		self.log:info("Canceled Discord presence")
	end)
end

-- Call a command on a remote Neovim instance at the provided IPC path
function Presence:call_remote_nvim_instance(socket, command)
	local remote_nvim_instance = vim.loop.new_pipe(true)

	remote_nvim_instance:connect(socket, function()
		self.log:debug(string.format("Connected to remote nvim instance at %s", socket))

		local packed = msgpack.pack({ 0, 0, "nvim_command", { command } })

		remote_nvim_instance:write(packed, function()
			self.log:debug(string.format("Wrote to remote nvim instance: %s", socket))
		end)
	end)
end

-- Call a Presence method on a remote instance with a given list of arguments
function Presence:call_remote_method(socket, name, args)
	local command_fmt = "lua package.loaded.presence:%s(%s)"

	-- Stringify the list of args
	for i = 1, #args do
		local arg = args[i]
		if type(arg) == "string" then
			args[i] = string.format([["%s"]], arg)
		elseif type(arg) == "boolean" then
			args[i] = string.format([["%s"]], tostring(arg))
		elseif type(arg) == "table" then
			-- Wrap serpent dump with function invocation to pass in the table value
			args[i] = string.format("(function() %s end)()", serpent.dump(arg))
		end
	end

	local arglist = table.concat(args or {}, ",")
	local command = string.format(command_fmt, name, arglist)
	self:call_remote_nvim_instance(socket, command)
end

function Presence:connect(on_done)
	self.log:debug("Connecting to Discord...")

	self.is_connecting = true

	self.discord:connect(function(err)
		self.is_connecting = false

		-- Handle known connection errors
		if err == "EISCONN" then
			self.log:info("Already connected to Discord")
		elseif err == "ECONNREFUSED" then
			self.log:warn("Failed to connect to Discord: " .. err .. " (is Discord running?)")
			return
		elseif err then
			self.log:error("Failed to connect to Discord: " .. err)
			return
		end

		self.log:info("Connected to Discord")
		self.is_connected = true

		if on_done then
			on_done()
		end
	end)
end

function Presence:authorize(on_done)
	self.log:debug("Authorizing with Discord...")

	-- Track authorization state to avoid race conditions
	-- (Discord rejects when multiple auth requests are sent at once)
	self.is_authorizing = true

	self.discord:authorize(function(err, response)
		self.is_authorizing = false

		if err and err:find(".*already did handshake.*") then
			self.log:info("Already authorized with Discord")
			self.is_authorized = true
			return on_done()
		elseif err then
			self.log:error("Failed to authorize with Discord: " .. err)
			self.is_authorized = false
			return
		end

		if not response then
			self.log:info(string.format("Authorized with Discord for %s", "Response was nil"))
		else
			self.log:info(string.format("Authorized with Discord for %s", response.data.user.username))
		end

		self.is_authorized = true

		if on_done then
			on_done()
		end
	end)
end

-- Find the Discord socket from temp runtime directories
function Presence:get_discord_socket_path()
	local sock_name = "discord-ipc-0"
	local sock_path = nil

	if self.os.is_wsl then
		-- Use socket created by relay for WSL
		sock_path = "/var/run/" .. sock_name
	elseif self.os.name == "windows" then
		-- Use named pipe in NPFS for Windows
		sock_path = [[\\.\pipe\]] .. sock_name
	elseif self.os.name == "macos" then
		-- Use $TMPDIR for macOS
		local path = os.getenv("TMPDIR")

		if path then
			sock_path = path:match("/$") and path .. sock_name or path .. "/" .. sock_name
		end
	elseif self.os.name == "linux" then
		-- Check various temp directory environment variables
		local env_vars = {
			"XDG_RUNTIME_DIR",
			"TEMP",
			"TMP",
			"TMPDIR",
		}

		local xdg_path = os.getenv("XDG_RUNTIME_DIR")
		if xdg_path then
			-- Append app/com.discordapp.Discord/ to the end of the path (make sure that / is at the end of xdg_path
			-- before appending)
			xdg_path = xdg_path and xdg_path:match("/$") and xdg_path .. "app/com.discordapp.Discord"
				or xdg_path .. "/app/com.discordapp.Discord"
			self.log:debug(string.format("Using XDG runtime path: %s", xdg_path))
			sock_path = xdg_path:match("/$") and xdg_path .. sock_name or xdg_path .. "/" .. sock_name
			-- Check if the socket path exists and if not set it to nil
			sock_path = vim.fn.filereadable(sock_path) == 1 and sock_path or nil
		end

		-- If the socket path is still nil, check other temp directories
		if not sock_path then
			for i = 1, #env_vars do
				local var = env_vars[i]
				local path = os.getenv(var)
				if path then
					self.log:debug(string.format("Using runtime path: %s", path))
					sock_path = path:match("/$") and path .. sock_name or path .. "/" .. sock_name
					break
				end
			end
		end
	end

	return sock_path
end

-- Gets the file path of the current vim buffer
function Presence.get_current_buffer()
	local current_buffer = vim.api.nvim_get_current_buf()
	return vim.api.nvim_buf_get_name(current_buffer)
end

-- Gets the current project name
function Presence:get_project_name(file_path)
	if not file_path then
		return nil
	end

	-- Escape quotes in the file path
	file_path = file_path:gsub([["]], [[\"]])

	-- TODO: Only checks for a git repository, could add more checks here
	-- Might want to run this in a background process depending on performance
	local project_path_cmd = "git rev-parse --show-toplevel"
	project_path_cmd = file_path and string.format([[cd "%s" && %s]], file_path, project_path_cmd) or project_path_cmd

	local project_path = vim.fn.system(project_path_cmd)
	project_path = vim.trim(project_path)

	if project_path:find("fatal.*") then
		self.log:info("Not a git repository, skipping...")
		return nil
	end
	if vim.v.shell_error ~= 0 or #project_path == 0 then
		local message_fmt = "Failed to get project name (error code %d): %s"
		self.log:error(string.format(message_fmt, vim.v.shell_error, project_path))
		return nil
	end

	-- Since git always uses forward slashes, replace with backslash in Windows
	if self.os.name == "windows" then
		project_path = project_path:gsub("/", [[\]])
	end

	return self.get_filename(project_path, self.os.path_separator), project_path
end

-- Get the name of the parent directory for the given path
function Presence.get_dir_path(path, path_separator)
	return path:match(string.format("^(.+%s.+)%s.*$", path_separator, path_separator))
end

-- Get the name of the file for the given path
function Presence.get_filename(path, path_separator)
	return path:match(string.format("^.+%s(.+)$", path_separator))
end

-- Get the file extension for the given filename
function Presence.get_file_extension(path)
	return path:match("^.+%.(.+)$")
end

-- Format any status text via options and support custom formatter functions
function Presence:format_status_text(status_type, ...)
	local option_name = string.format("%s_text", status_type)
	local text_option = self.options[option_name]
	if type(text_option) == "function" then
		return text_option(...)
	else
		return string.format(text_option, ...)
	end
end

-- Get the status text for the current buffer
function Presence:get_status_text(filename)
	local file_explorer = file_explorers[vim.bo.filetype:match("[^%d]+")]
		or file_explorers[(filename or ""):match("[^%d]+")]
	local plugin_manager = plugin_managers[vim.bo.filetype]

	if file_explorer then
		return self:format_status_text("file_explorer", file_explorer)
	elseif plugin_manager then
		return self:format_status_text("plugin_manager", plugin_manager)
	end

	if not filename or filename == "" then
		return nil
	end

	if vim.bo.modifiable and not vim.bo.readonly then
		if vim.bo.filetype == "gitcommit" then
			return self:format_status_text("git_commit", filename)
		elseif filename then
			return self:format_status_text("editing", filename)
		end
	elseif filename then
		return self:format_status_text("reading", filename)
	end
end

-- Get all local nvim socket paths
function Presence:get_nvim_socket_paths(on_done)
	self.log:debug("Getting nvim socket paths...")
	local sockets = {}
	local parser = {}
	local cmd

	if self.os.is_wsl then
		-- TODO: There needs to be a better way of doing this... no support for ss/netstat?
		-- (See https://github.com/microsoft/WSL/issues/2249)
		local cmd_fmt = "for file in %s/nvim*; do echo $file; done"
		local shell_cmd = string.format(cmd_fmt, vim.fn.stdpath("run") or "/tmp")

		cmd = {
			"sh",
			"-c",
			shell_cmd,
		}
	elseif self.os.name == "windows" then
		cmd = {
			"powershell.exe",
			"-Command",
			[[(Get-ChildItem \\.\pipe\).FullName | findstr 'nvim']],
		}
	elseif self.os.name == "macos" then
		if vim.fn.executable("netstat") == 0 then
			self.log:warn("Unable to get nvim socket paths: `netstat` command unavailable")
			return
		end

		-- Define macOS BSD netstat output parser
		function parser.parse(data)
			return data:match("%s(/.+)")
		end

		cmd = table.concat({
			"netstat -u",
			[[grep -E --color=never ".+nvim.+"]],
		}, "|")
	elseif self.os.name == "linux" then
		if vim.fn.executable("ss") == 1 then
			-- Use `ss` if available
			cmd = table.concat({
				"ss -lx",
				[[grep -E ".+nvim.+"]],
			}, "|")

			-- Define ss output parser
			function parser.parse(data)
				return data:match("%s(/.-)%s")
			end
		elseif vim.fn.executable("netstat") == 1 then
			-- Use `netstat` if available
			cmd = table.concat({
				"netstat -u",
				[[grep -E --color=never ".+nvim.+"]],
			}, "|")

			-- Define netstat output parser
			function parser.parse(data)
				return data:match("%s(/.+)")
			end
		else
			local warning_msg = "Unable to get nvim socket paths: `netstat` and `ss` commands unavailable"
			self.log:warn(warning_msg)
			return
		end
	else
		local warning_fmt = "Unable to get nvim socket paths: Unexpected OS: %s"
		self.log:warn(string.format(warning_fmt, self.os.name))
		return
	end

	local function handle_data(_, data)
		if not data then
			return
		end

		for i = 1, #data do
			local socket = parser.parse and parser.parse(vim.trim(data[i])) or vim.trim(data[i])
			if socket and socket ~= "" and socket ~= self.socket then
				table.insert(sockets, socket)
			end
		end
	end

	local function handle_error(_, data)
		if not data then
			return
		end

		if data[1] ~= "" then
			self.log:error(string.format("Unable to get nvim socket paths: %s", data[1]))
		end
	end

	local function handle_exit()
		self.log:debug(string.format("Got nvim socket paths: %s", vim.inspect(sockets)))
		on_done(sockets)
	end

	local cmd_str = type(cmd) == "table" and table.concat(cmd, ", ") or cmd
	self.log:debug(string.format("Executing command: `%s`", cmd_str))
	vim.fn.jobstart(cmd, {
		on_stdout = handle_data,
		on_stderr = handle_error,
		on_exit = handle_exit,
	})
end

-- Wrap calls to Discord that require prior connection and authorization
function Presence.discord_event(on_ready)
	return function(self, ...)
		if not self.discord.ipc_socket then
			self.log:debug("Discord IPC socket not found, skipping...")
			return
		end

		local args = { ... }
		local callback = function()
			on_ready(self, unpack(args))
		end

		-- Call Discord if already connected and authorized
		if self.is_connected and self.is_authorized then
			return callback()
		end

		-- Schedule event if currently authorizing with Discord
		if self.is_connecting or self.is_authorizing then
			local action = self.is_connecting and "connecting" or "authorizing"
			local message_fmt = "Currently %s with Discord, scheduling callback for later..."
			self.log:debug(string.format(message_fmt, action))
			return vim.schedule(callback)
		end

		-- Authorize if connected but not yet authorized yet
		if self.is_connected and not self.is_authorized then
			return self:authorize(callback)
		end

		-- Connect and authorize plugin with Discord
		self:connect(function()
			if self.is_authorized then
				return callback()
			end

			self:authorize(callback)
		end)
	end
end

-- Check if the current project/parent is in blacklist
function Presence:check_blacklist(buffer, parent_dirpath, project_dirpath)
	local parent_dirname = nil
	local project_dirname = nil

	-- Parse parent/project directory name
	if parent_dirpath then
		parent_dirname = self.get_filename(parent_dirpath, self.os.path_separator)
	end

	if project_dirpath then
		project_dirname = self.get_filename(project_dirpath, self.os.path_separator)
	end

	-- Blacklist table
	local blacklist_table = self.options["blacklist"]

	-- Loop over the values to see if the provided project/path is in the blacklist
	for _, val in pairs(blacklist_table) do
		-- Matches buffer exactly
		if buffer:match(val) == buffer then
			return true
		end
		-- Match parent either by Lua pattern or by plain string
		local is_parent_directory_blacklisted = parent_dirpath
			and (
				(parent_dirpath:match(val) == parent_dirpath or parent_dirname:match(val) == parent_dirname)
				or (parent_dirpath:find(val, nil, true) or parent_dirname:find(val, nil, true))
			)
		if is_parent_directory_blacklisted then
			return true
		end
		-- Match project either by Lua pattern or by plain string
		local is_project_directory_blacklisted = project_dirpath
			and (
				(project_dirpath:match(val) == project_dirpath or project_dirname:match(val) == project_dirname)
				or (project_dirpath:find(val, nil, true) or project_dirname:find(val, nil, true))
			)
		if is_project_directory_blacklisted then
			return true
		end
	end

	return false
end

-- Get either user-configured buttons or the create default "View Repository" button definition
function Presence:get_buttons(buffer, parent_dirpath)
	-- User configured a static buttons table
	if type(self.options.buttons) == "table" then
		local is_plural = #self.options.buttons > 1
		local s = is_plural and "s" or ""
		self.log:debug(string.format("Using custom-defined button%s", s))

		return self.options.buttons
	end

	-- Retrieve the git repository URL
	local repo_url
	if parent_dirpath then
		-- Escape quotes in the file path
		local path = parent_dirpath:gsub([["]], [[\"]])
		local git_url_cmd = "git config --get remote.origin.url"
		local cmd = path and string.format([[cd "%s" && %s]], path, git_url_cmd) or git_url_cmd

		-- Trim and coerce empty string value to null
		repo_url = vim.trim(vim.fn.system(cmd))
		repo_url = repo_url ~= "" and repo_url or nil
	end

	-- User configured a function to dynamically create buttons table
	if type(self.options.buttons) == "function" then
		self.log:debug("Using custom-defined button config function")
		return self.options.buttons(buffer, repo_url)
	end

	-- Default behavior to show a "View Repository" button if the repo URL is valid
	if repo_url then
		-- Check if repo url uses short ssh syntax
		local domain, project = repo_url:match("^git@(.+):(.+)$")
		if domain and project then
			self.log:debug(string.format("Repository URL uses short ssh syntax: %s", repo_url))
			repo_url = string.format("https://%s/%s", domain, project)
		end

		-- Check if repo url uses a valid protocol
		local protocols = {
			"ftp",
			"git",
			"http",
			"https",
			"ssh",
		}
		local protocol, relative = repo_url:match("^(.+)://(.+)$")
		if not vim.tbl_contains(protocols, protocol) or not relative then
			self.log:debug(string.format("Repository URL uses invalid protocol: %s", repo_url))
			return nil
		end

		-- Check if repo url has the user specified
		local user, path = relative:match("^(.+)@(.+)$")
		if user and path then
			self.log:debug(string.format("Repository URL has user specified: %s", repo_url))
			repo_url = string.format("https://%s", path)
		else
			repo_url = string.format("https://%s", relative)
		end

		self.log:debug(string.format("Adding button with repository URL: %s", repo_url))

		return {
			{ label = "View Repository", url = repo_url },
		}
	end

	return nil
end

-- Update Rich Presence for the provided vim buffer
function Presence:update_for_buffer(buffer, should_debounce)
	-- Avoid unnecessary updates if the previous activity was for the current buffer
	-- (allow same-buffer updates when line numbers are enabled)
	if self.options.enable_line_number == 0 and self.last_activity.file == buffer then
		self.log:debug(string.format("Activity already set for %s, skipping...", buffer))
		return
	end

	-- Parse vim buffer
	local filename = self.get_filename(buffer, self.os.path_separator)
	local parent_dirpath = self.get_dir_path(buffer, self.os.path_separator)
	local extension = filename and self.get_file_extension(filename) or nil
	self.log:debug(string.format("Parsed filename %s with %s extension", filename, extension or "no"))

	-- Return early if there is no valid activity status text to set
	local status_text = self:get_status_text(filename)
	if not status_text then
		return self.log:debug("No status text for the given buffer, skipping...")
	end

	-- Get project information
	self.log:debug(string.format("Getting project name for %s...", parent_dirpath))
	local project_name, project_path = self:get_project_name(parent_dirpath)

	-- Check for blacklist
	local is_blacklisted = #self.options.blacklist > 0 and self:check_blacklist(buffer, parent_dirpath, project_path)
	if is_blacklisted then
		self.last_activity.file = buffer
		self.log:debug("Either project or directory name is blacklisted, skipping...")
		self:cancel()
		return
	end

	local activity_set_at = os.time()
	-- If we shouldn't debounce and we trigger an activity, keep this value the same.
	-- Otherwise set it to the current time.
	local relative_activity_set_at = should_debounce and self.last_activity.relative_set_at or os.time()

	self.log:debug(string.format("Setting activity for %s...", buffer and #buffer > 0 and buffer or "unnamed buffer"))

	-- Determine image text and asset key
	local name = filename
	local asset_key = "code"
	local description = filename
	local file_asset = self.options.file_assets[filename] or self.options.file_assets[extension]
	if file_asset then
		name, asset_key, description = unpack(file_asset)
		self.log:debug(string.format("Using file asset: %s", vim.inspect(file_asset)))
	end

	-- Construct activity asset information
	local file_text = description or name
	local neovim_image_text = self.options.neovim_image_text
	local use_file_as_main_image = self.options.main_image == "file"
	local use_neovim_as_main_image = self.options.main_image == "neovim"
	local assets = {
		large_image = use_file_as_main_image and asset_key
			or use_neovim_as_main_image and "neovim"
			or self.options.main_image,
		large_text = use_file_as_main_image and file_text or neovim_image_text,
		small_image = use_file_as_main_image and "neovim" or asset_key,
		small_text = use_file_as_main_image and neovim_image_text or file_text,
	}

	local activity = {
		state = status_text,
		assets = assets,
		timestamps = self.options.show_time == 1 and {
			start = relative_activity_set_at,
		} or nil,
	}

	-- Add button that links to the git workspace remote origin url
	if self.options.buttons ~= 0 then
		local buttons = self:get_buttons(buffer, parent_dirpath)
		if buttons then
			self.log:debug(string.format("Attaching buttons to activity: %s", vim.inspect(buttons)))
			activity.buttons = buttons
		end
	end

	-- Get the current line number and line count if the user has set the enable_line_number option
	if self.options.enable_line_number == 1 then
		self.log:debug("Getting line number for current buffer...")

		local line_number = vim.api.nvim_win_get_cursor(0)[1]
		local line_count = vim.api.nvim_buf_line_count(0)
		local line_number_text = self:format_status_text("line_number", line_number, line_count)

		activity.details = line_number_text

		self.workspace = nil
		self.last_activity = {
			id = self.id,
			file = buffer,
			set_at = activity_set_at,
			relative_set_at = relative_activity_set_at,
			workspace = nil,
		}
	else
		-- Include project details if available and if the user hasn't set the enable_line_number option
		if project_name then
			self.log:debug(string.format("Detected project: %s", project_name))

			activity.details = self:format_status_text("workspace", project_name, buffer)

			self.workspace = project_path
			self.last_activity = {
				id = self.id,
				file = buffer,
				set_at = activity_set_at,
				relative_set_at = relative_activity_set_at,
				workspace = project_path,
			}

			if self.workspaces[project_path] then
				self.workspaces[project_path].updated_at = activity_set_at
				activity.timestamps = self.options.show_time == 1
						and {
							start = self.workspaces[project_path].started_at,
						}
					or nil
			else
				self.workspaces[project_path] = {
					started_at = activity_set_at,
					updated_at = activity_set_at,
				}
			end
		else
			self.log:debug("No project detected")

			self.workspace = nil
			self.last_activity = {
				id = self.id,
				file = buffer,
				set_at = activity_set_at,
				relative_set_at = relative_activity_set_at,
				workspace = nil,
			}

			-- When no project is detected, set custom workspace text if:
			-- * The custom function returns custom workspace text
			-- * The configured workspace text does not contain a directive
			-- (can't use the `format_status_text` method here)
			local workspace_text = self.options.workspace_text
			if type(workspace_text) == "function" then
				local custom_workspace_text = workspace_text(nil, buffer)
				if custom_workspace_text then
					activity.details = custom_workspace_text
				end
			elseif not workspace_text:find("%s") then
				activity.details = workspace_text
			end
		end
	end

	-- Sync activity to all peers
	self.log:debug("Sync activity to all peers...")
	self:sync_self_activity()

	self.log:debug("Setting Discord activity...")
	self.discord:set_activity(activity, function(err)
		if err then
			self.log:error(string.format("Failed to set activity in Discord: %s", err))
			return
		end

		self.log:info(string.format("Set activity in Discord for %s", filename))
	end)
end

-- Update Rich Presence for the current or provided vim buffer for an authorized connection
Presence.update = Presence.discord_event(function(self, buffer, should_debounce)
	-- Default update to not debounce by default
	if should_debounce == nil then
		should_debounce = false
	end

	-- Debounce Rich Presence updates (default to 10 seconds):
	-- https://discord.com/developers/docs/rich-presence/how-to#updating-presence
	local last_updated_at = self.last_activity.set_at
	local debounce_timeout = self.options.debounce_timeout
	local should_skip = should_debounce
		and debounce_timeout
		and last_updated_at
		and os.time() - last_updated_at <= debounce_timeout

	if should_skip then
		local message_fmt = "Last activity sent was within %d seconds ago, skipping..."
		self.log:debug(string.format(message_fmt, debounce_timeout))
		return
	end

	if buffer then
		self:update_for_buffer(buffer, should_debounce)
	else
		vim.schedule(function()
			self:update_for_buffer(self.get_current_buffer(), should_debounce)
		end)
	end
end)

--------------------------------------------------
-- Presence peer-to-peer API
--------------------------------------------------

-- Register some remote peer
function Presence:register_peer(id, socket)
	self.log:debug(string.format("Registering peer %s...", id))

	self.peers[id] = {
		socket = socket,
		workspace = nil,
	}

	self.log:info(string.format("Registered peer %s", id))
end

-- Unregister some remote peer
function Presence:unregister_peer(id, peer)
	self.log:debug(string.format("Unregistering peer %s... %s", id, vim.inspect(peer)))

	-- Remove workspace if no other peers share the same workspace
	-- Initialize to remove if the workspace differs from the local workspace, check peers below
	local should_remove_workspace = peer.workspace ~= self.workspace

	local peers = {}
	for peer_id, peer_data in pairs(self.peers) do
		-- Omit peer from peers list
		if peer_id ~= id then
			peers[peer_id] = peer_data

			-- Should not remove workspace if another peer shares the workspace
			if should_remove_workspace and peer.workspace == peer_data.workspace then
				should_remove_workspace = false
			end
		end
	end

	self.peers = peers

	-- Update workspaces if necessary
	local workspaces = {}
	if should_remove_workspace then
		self.log:debug(string.format("Should remove workspace %s", peer.workspace))
		for workspace, data in pairs(self.workspaces) do
			if workspace ~= peer.workspace then
				workspaces[workspace] = data
			end
		end

		self.workspaces = workspaces
	end

	self.log:info(string.format("Unregistered peer %s", id))
end

-- Unregister some remote peer and set activity
function Presence:unregister_peer_and_set_activity(id, peer)
	self:unregister_peer(id, peer)
	self:update()
end

-- Register a remote peer and sync its data
function Presence:register_and_sync_peer(id, socket)
	self:register_peer(id, socket)

	self.log:debug("Syncing data with newly registered peer...")

	-- Initialize the remote peer's list including self
	local peers = {
		[self.id] = {
			socket = self.socket,
			workspace = self.workspace,
		},
	}
	for peer_id, peer in pairs(self.peers) do
		if peer_id ~= id then
			peers[peer_id] = peer
		end
	end

	self:call_remote_method(socket, "sync_self", {
		{
			last_activity = self.last_activity,
			peers = peers,
			workspaces = self.workspaces,
		},
	})
end

-- Register self to any remote Neovim instances
-- Simply emits to all nvim sockets as we have not yet been synced with peer list
function Presence:register_self()
	self:get_nvim_socket_paths(function(sockets)
		if #sockets == 0 then
			self.log:debug("No other remote nvim instances")
			return
		end

		self.log:debug(string.format("Registering as a new peer to %d instance(s)...", #sockets))

		-- Register and sync state with one of the sockets
		self:call_remote_method(sockets[1], "register_and_sync_peer", { self.id, self.socket })

		if #sockets == 1 then
			return
		end

		for i = 2, #sockets do
			self:call_remote_method(sockets[i], "register_peer", { self.id, self.socket })
		end
	end)
end

-- Unregister self to all peers
function Presence:unregister_self()
	local self_as_peer = {
		socket = self.socket,
		workspace = self.workspace,
	}

	local i = 1
	for id, peer in pairs(self.peers) do
		if self.options.auto_update and i == 1 then
			self.log:debug(string.format("Unregistering self and setting activity for peer %s...", id))
			self:call_remote_method(peer.socket, "unregister_peer_and_set_activity", { self.id, self_as_peer })
		else
			self.log:debug(string.format("Unregistering self to peer %s...", id))
			self:call_remote_method(peer.socket, "unregister_peer", { self.id, self_as_peer })
		end
		i = i + 1
	end
end

-- Sync self with data from a remote peer
function Presence:sync_self(data)
	self.log:debug(string.format("Syncing data from remote peer...", vim.inspect(data)))

	for key, value in pairs(data) do
		self[key] = value
	end

	self.log:info("Synced runtime data from remote peer")
end

-- Sync activity set by self to all peers
function Presence:sync_self_activity()
	local self_as_peer = {
		socket = self.socket,
		workspace = self.workspace,
	}

	for id, peer in pairs(self.peers) do
		self.log:debug(string.format("Syncing activity to peer %s...", id))

		local peers = { [self.id] = self_as_peer }
		for peer_id, peer_data in pairs(self.peers) do
			if peer_id ~= id then
				peers[peer_id] = {
					socket = peer_data.socket,
					workspace = peer_data.workspace,
				}
			end
		end

		self:call_remote_method(peer.socket, "sync_peer_activity", {
			{
				last_activity = self.last_activity,
				peers = peers,
				workspaces = self.workspaces,
			},
		})
	end
end

-- Sync activity set by peer
function Presence:sync_peer_activity(data)
	self.log:debug(string.format("Syncing peer activity %s...", vim.inspect(data)))
	self:cancel()
	self:sync_self(data)
end

function Presence:stop()
	self.log:debug("Disconnecting from Discord...")
	self.discord:disconnect(function()
		self.log:info("Disconnected from Discord")
	end)
end

--------------------------------------------------
-- Presence event handlers
--------------------------------------------------

-- FocusGained events force-update the presence for the current buffer unless it's a quickfix window
function Presence:handle_focus_gained()
	self.log:debug("Handling FocusGained event...")

	-- Skip a potentially extraneous update call on initial startup if tmux is being used
	-- (See https://github.com/neovim/neovim/issues/14572)
	if next(self.last_activity) == nil and os.getenv("TMUX") then
		self.log:debug("Skipping presence update for FocusGained event triggered by tmux...")
		return
	end

	if vim.bo.filetype == "qf" then
		self.log:debug("Skipping presence update for quickfix window...")
		return
	end

	self:update()
end

-- TextChanged events debounce current buffer presence updates
function Presence:handle_text_changed()
	self.log:debug("Handling TextChanged event...")
	self:update(nil, true)
end

-- VimLeavePre events unregister the leaving instance to all peers and sets activity for the first peer
function Presence:handle_vim_leave_pre()
	self.log:debug("Handling VimLeavePre event...")
	self:unregister_self()
	self:cancel()
end

-- WinEnter events force-update the current buffer presence unless it's a quickfix window
function Presence:handle_win_enter()
	self.log:debug("Handling WinEnter event...")

	vim.schedule(function()
		if vim.bo.filetype == "qf" then
			self.log:debug("Skipping presence update for quickfix window...")
			return
		end

		self:update()
	end)
end

-- WinLeave events cancel the current buffer presence
function Presence:handle_win_leave()
	self.log:debug("Handling WinLeave event...")

	local current_window = vim.api.nvim_get_current_win()

	vim.schedule(function()
		-- Avoid canceling presence when switching to a quickfix window
		if vim.bo.filetype == "qf" then
			self.log:debug("Not canceling presence due to switching to quickfix window...")
			return
		end

		-- Avoid canceling presence when switching between windows
		if current_window ~= vim.api.nvim_get_current_win() then
			self.log:debug("Not canceling presence due to switching to a window within the same instance...")
			return
		end

		self.log:debug("Canceling presence due to leaving window...")
		self:cancel()
	end)
end

-- BufEnter events force-update the presence for the current buffer unless it's a quickfix window
function Presence:handle_buf_enter()
	self.log:debug("Handling BufEnter event...")

	if vim.bo.filetype == "qf" then
		self.log:debug("Skipping presence update for quickfix window...")
		return
	end

	self:update()
end

-- BufAdd events force-update the presence for the current buffer unless it's a quickfix window
function Presence:handle_buf_add()
	self.log:debug("Handling BufAdd event...")

	vim.schedule(function()
		if vim.bo.filetype == "qf" then
			self.log:debug("Skipping presence update for quickfix window...")
			return
		end

		self:update()
	end)
end

return Presence