local set = require("rabbit.plugins.util")

---@class Rabbit.Plugin.Buffers.Options
---@field public ignore_unlisted? boolean If true, will ignore unlisted buffers (like Oil)

---@class Rabbit.Plugin.Buffers: Rabbit.Plugin
local M = { ---@type Rabbit.Plugin
	color = "#d08e95",
	name = "buffers",
	func = {},
	switch = "b",
	listing = {},
	empty_msg = "There's nowhere to jump to! Get started by opening another buffer",
	skip_same = true,
	keys = {},
	evt = {},

	---@param p Rabbit.Plugin.Buffers
	init = function(p)
		p.listing.last_closed = {}
		p.listing.opened = {}
	end,

	---@type Rabbit.Plugin.Buffers.Options
	opts = {
		ignore_unlisted = true,
	},
}

function M.evt.BufEnter(evt, winid)
	local is_listed = vim.api.nvim_get_option_value("buflisted", { buf = evt.buf })
	if M.opts.ignore_unlisted and not is_listed then
		return
	end
	set.add(M.listing[winid], evt.buf)
	set.add(M.listing.opened, evt.buf)
end

function M.evt.BufDelete(evt, winid)
	set.sub(M.listing[winid], evt.buf)
	set.sub(M.listing.opened, evt.buf)
end

function M.evt.RabbitEnter(_, winid)
	M.listing[0] = nil
	if #M.listing[winid] > 1 then
		return
	end

	if #M.listing.last_closed > 1 then
		M.listing[0] = vim.deepcopy(M.listing.last_closed)
		table.insert(M.listing[0], 1, "rabbitmsg://Restore full history")
		M.listing.last_closed = {}
	elseif #M.listing.opened > 1 then
		M.listing[0] = vim.deepcopy(M.listing.opened)
		table.insert(M.listing[0], 1, "rabbitmsg://Open all buffers")
	end
end

function M.evt.WinClosed(_, winid)
	if M.listing[winid] ~= nil and #M.listing[winid] > 0 then
		M.listing.last_closed = M.listing[winid]
	end
	M.listing[winid] = nil
end

---@param n integer
function M.func.select(n)
	local rabbit = require("rabbit")
	if M.listing[0] == nil or n ~= 1 then
		return rabbit.func.select(n)
	end

	M.listing[0] = rabbit.ctx.listing
	table.remove(M.listing[0], 1)
	M.listing[rabbit.user.win] = M.listing[0]
	vim.api.nvim_win_set_buf(rabbit.user.win, tonumber(M.listing[0][1]) or 0)
	M.listing[0] = nil

	rabbit.func.close()
end

---@param n integer
function M.func.file_del(n)
	local rabbit = require("rabbit")
	M.listing[rabbit.user.win] = rabbit.ctx.listing
	table.remove(M.listing[rabbit.user.win], n)
	table.insert(M.listing[rabbit.user.win], 1, rabbit.user.buf)
	if M.listing[0] ~= nil then
		table.remove(M.listing[rabbit.user.win], 1)
		M.listing[0] = vim.deepcopy(M.listing[rabbit.user.win])
		table.insert(M.listing[0], 1, "rabbitmsg://Restore full history")
	end
	require("rabbit").Redraw()
end

return M