local term_win = nil
local term_buf = nil

local function toggle_term()
	if term_win and vim.api.nvim_win_is_valid(term_win) then
		vim.api.nvim_win_close(term_win, false)
		term_win = nil
	else
		vim.cmd('botright vsplit')
		term_win = vim.api.nvim_get_current_win()
		if term_buf and vim.api.nvim_buf_is_valid(term_buf) then
			vim.api.nvim_win_set_buf(term_win, term_buf)
		else
			vim.cmd('terminal')
			term_buf = vim.api.nvim_get_current_buf()
		end
		vim.api.nvim_win_set_width(term_win, math.floor(vim.o.columns * 0.35))
		vim.cmd('startinsert')
	end
end

-- Jump to previous non-terminal buffer
local function prev_non_term_buf()
	local cur = vim.api.nvim_get_current_buf()
	local bufs = vim.fn.getbufinfo({ buflisted = 1 })

	-- Walk buffer list in reverse to find last non-terminal buffer that isn't current
	local history = vim.fn.execute('ls t')  -- 't' flag = sort by last used time
	local candidates = {}
	for _, info in ipairs(bufs) do
		local bufnr = info.bufnr
		if bufnr ~= cur
			and bufnr ~= term_buf
			and vim.bo[bufnr].buftype ~= 'terminal'
			then
				table.insert(candidates, { bufnr = bufnr, lastused = info.lastused })
			end
		end

		if #candidates == 0 then
			print('No previous non-terminal buffer')
			return
		end

	-- Sort by lastused descending, pick the most recently used
	table.sort(candidates, function(a, b) return a.lastused > b.lastused end)
	vim.api.nvim_set_current_buf(candidates[1].bufnr)
end

-- Overrides init binding
map('n', '<leader>l', prev_non_term_buf, { desc = 'Go to previous non-terminal buffer' })
map('n', '<C-o>', function()
	if term_buf and vim.api.nvim_buf_is_valid(term_buf) then
		vim.api.nvim_set_current_buf(term_buf)
	else
		print('No terminal buffer open yet')
	end
end)
map('n', '<C-j>', toggle_term, { desc = 'Toggle terminal' })

-- terminal mode binds
map('t', '<C-j>', toggle_term, { desc = 'Toggle terminal' })
map('t', '<C-o>', '<C-\\><C-n><C-^>', { desc = 'Go to last buffer' })