--[[ 50-autoreload.lua — opt-in reloading of buffers changed outside Neovim.

When enabled, buffers whose file changed on disk are reloaded silently, in one batch, on focus / idle /
buffer-enter — no per-file change prompt. Conflicts (the buffer was also edited in Neovim) and
deletions still defer to Neovim's usual prompt. Off by default; the state lives in
`vim.g.autoreload` and shows as the `+R` flag in the statusline (see 50-color.lua).

User commands:
  `AutoreloadToggle`:  toggle disk-change autoreload for this Neovim instance
]]

vim.g.autoreload = false

-- Re-stat every loaded buffer in one pass; the FileChangedShell handler below decides per buffer.
local function check_all_buffers()
	if vim.g.autoreload then
		vim.cmd.checktime() -- no argument → all loaded buffers at once
	end
end

vim.api.nvim_create_autocmd(
	{ "FocusGained", "BufEnter", "CursorHold", "CursorHoldI", "TermLeave" },
	{
		group = vim.g.dotfiles.augroup,
		callback = check_all_buffers,
	}
)

--[[ Decide what happens when Neovim notices a file changed under it. While autoreload is on, a plain
on-disk change reloads the buffer with no prompt (batched, since `checktime` fires this for each
changed buffer in a single pass); conflicts and deletions fall back to `ask`. While off, everything
falls back to `ask`, i.e. Neovim's default handling. See <nvim-help://v:fcs_choice>. ]]
vim.api.nvim_create_autocmd("FileChangedShell", {
	group = vim.g.dotfiles.augroup,
	callback = function()
		if vim.g.autoreload and vim.v.fcs_reason == "changed" then
			vim.v.fcs_choice = "reload"
		else
			vim.v.fcs_choice = "ask"
		end
	end,
})

-- Flip autoreload for this instance; check immediately when turning it on so pending changes catch up.
local function toggle_autoreload()
	vim.g.autoreload = not vim.g.autoreload
	vim.notify("Buffer autoreload " .. (vim.g.autoreload and "enabled" or "disabled"))
	check_all_buffers()
	vim.cmd.redrawstatus()
end

vim.api.nvim_create_user_command(
	"AutoreloadToggle",
	toggle_autoreload,
	{ desc = "Toggle buffer autoreload" }
)