-- Clipboard for sessions whose yanks may need to reach another machine:
-- every copy is emitted as OSC 52 (inside tmux this becomes a tmux buffer,
-- rebroadcast to every attached client, local or SSH). Paste prefers the
-- local Wayland clipboard when one is available, so content copied in other
-- apps remains pasteable; without a display, paste is an OSC 52 query that
-- tmux (or the terminal) answers.
--
-- Ported from Omarchy's default nvim config (config/remote_clipboard.lua) so
-- this config keeps working over SSH/tmux the same way Omarchy's does.
local M = {}

local function proc_lines(pid, file)
	local ok, lines = pcall(vim.fn.readfile, "/proc/" .. pid .. "/" .. file)
	return ok and lines or {}
end

local function proc_ppid(pid)
	for _, line in ipairs(proc_lines(pid, "status")) do
		local ppid = line:match("^PPid:%s+(%d+)")
		if ppid then
			return tonumber(ppid)
		end
	end
end

local function ancestor_process_named(name)
	local pid = vim.fn.getpid()

	for _ = 1, 16 do
		local ppid = proc_ppid(pid)
		if not ppid or ppid <= 1 then
			return false
		end

		local comm = proc_lines(ppid, "comm")[1] or ""
		if comm:find(name, 1, true) then
			return true
		end

		pid = ppid
	end

	return false
end

function M.setup()
	local in_tmux = vim.env.TMUX ~= nil
	local in_ssh = vim.env.SSH_TTY ~= nil or vim.env.SSH_CONNECTION ~= nil
	local in_herdr = vim.env.HERDR_PANE_ID ~= nil or ancestor_process_named("herdr")

	if not (in_tmux or in_ssh or in_herdr) then
		return
	end

	local osc52 = require("vim.ui.clipboard.osc52")
	local has_wayland = vim.env.WAYLAND_DISPLAY ~= nil
		and vim.fn.executable("wl-copy") == 1
		and vim.fn.executable("wl-paste") == 1

	local function copy(register)
		local emit = osc52.copy(register)

		return function(lines)
			if has_wayland then
				local cmd = { "wl-copy", "--sensitive", "--type", "text/plain" }
				if register == "*" then
					cmd[#cmd + 1] = "--primary"
				end
				vim.fn.system(cmd, lines)
			end

			emit(lines)
		end
	end

	local function paste(register)
		if not has_wayland then
			return osc52.paste(register)
		end

		return function()
			local cmd = { "wl-paste", "--no-newline" }
			if register == "*" then
				cmd[#cmd + 1] = "--primary"
			end

			local lines = vim.fn.systemlist(cmd, "", 1)
			return vim.v.shell_error == 0 and lines or {}
		end
	end

	vim.g.clipboard = {
		name = "RemoteClipboard",
		copy = { ["+"] = copy("+"), ["*"] = copy("*") },
		paste = { ["+"] = paste("+"), ["*"] = paste("*") },
		cache_enabled = 0,
	}
end

return M