--
-- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
--
-- Copyright (c) 2015 Pedro Souza <pedrosouza@freebsd.org>
-- Copyright (C) 2018 Kyle Evans <kevans@FreeBSD.org>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
--    notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
--    notice, this list of conditions and the following disclaimer in the
--    documentation and/or other materials provided with the distribution.
--
-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.
--
-- $FreeBSD$
--


local core = require("core")
local color = require("color")
local config = require("config")
local screen = require("screen")
local drawer = require("drawer")

local menu = {}

local screen_invalid = true

local function OnOff(str, b)
	if b then
		return str .. color.escapef(color.GREEN) .. "On" ..
		    color.escapef(color.WHITE)
	else
		return str .. color.escapef(color.RED) .. "off" ..
		    color.escapef(color.WHITE)
	end
end

local function bootenvSet(env)
	loader.setenv("vfs.root.mountfrom", env)
	loader.setenv("currdev", env .. ":")
	config.reload()
end

-- Module exports
menu.handlers = {
	-- Menu handlers take the current menu and selected entry as parameters,
	-- and should return a boolean indicating whether execution should
	-- continue or not. The return value may be omitted if this entry should
	-- have no bearing on whether we continue or not, indicating that we
	-- should just continue after execution.
	[core.MENU_ENTRY] = function(_, entry)
		-- run function
		entry.func()
	end,
	[core.MENU_CAROUSEL_ENTRY] = function(_, entry)
		-- carousel (rotating) functionality
		local carid = entry.carousel_id
		local caridx = config.getCarouselIndex(carid)
		local choices = entry.items
		if type(choices) == "function" then
			choices = choices()
		end
		if #choices > 0 then
			caridx = (caridx % #choices) + 1
			config.setCarouselIndex(carid, caridx)
			entry.func(caridx, choices[caridx], choices)
		end
	end,
	[core.MENU_SUBMENU] = function(_, entry)
		screen_invalid = true
		menu.process(entry.submenu)
	end,
	[core.MENU_RETURN] = function(_, entry)
		-- allow entry to have a function/side effect
		if entry.func ~= nil then
			entry.func()
		end
		return false
	end,
}
-- loader menu tree is rooted at menu.welcome

menu.boot_environments = {
	entries = {
		-- return to welcome menu
		{
			entry_type = core.MENU_RETURN,
			name = "Back to main menu" ..
			    color.highlight(" [Backspace]"),
		},
		{
			entry_type = core.MENU_CAROUSEL_ENTRY,
			carousel_id = "be_active",
			items = core.bootenvList,
			name = function(idx, choice, all_choices)
				if #all_choices == 0 then
					return "Active: "
				end

				local is_default = (idx == 1)
				local bootenv_name = ""
				local name_color
				if is_default then
					name_color = color.escapef(color.GREEN)
				else
					name_color = color.escapef(color.BLUE)
				end
				bootenv_name = bootenv_name .. name_color ..
				    choice .. color.default()
				return color.highlight("A").."ctive: " ..
				    bootenv_name .. " (" .. idx .. " of " ..
				    #all_choices .. ")"
			end,
			func = function(_, choice, _)
				bootenvSet(choice)
			end,
			alias = {"a", "A"},
		},
		{
			entry_type = core.MENU_ENTRY,
			name = function()
				return color.highlight("b") .. "ootfs: " ..
				    core.bootenvDefault()
			end,
			func = function()
				-- Reset active boot environment to the default
				config.setCarouselIndex("be_active", 1)
				bootenvSet(core.bootenvDefault())
			end,
			alias = {"b", "B"},
		},
	},
}

menu.boot_options = {
	entries = {
		-- return to welcome menu
		{
			entry_type = core.MENU_RETURN,
			name = "Back to main menu" ..
			    color.highlight(" [Backspace]"),
		},
		-- load defaults
		{
			entry_type = core.MENU_ENTRY,
			name = "Load System " .. color.highlight("D") ..
			    "efaults",
			func = core.setDefaults,
			alias = {"d", "D"},
		},
		{
			entry_type = core.MENU_SEPARATOR,
		},
		{
			entry_type = core.MENU_SEPARATOR,
			name = "Boot Options:",
		},
		-- acpi
		{
			entry_type = core.MENU_ENTRY,
			visible = core.isSystem386,
			name = function()
				return OnOff(color.highlight("A") ..
				    "CPI       :", core.acpi)
			end,
			func = core.setACPI,
			alias = {"a", "A"},
		},
		-- safe mode
		{
			entry_type = core.MENU_ENTRY,
			name = function()
				return OnOff("Safe " .. color.highlight("M") ..
				    "ode  :", core.sm)
			end,
			func = core.setSafeMode,
			alias = {"m", "M"},
		},
		-- single user
		{
			entry_type = core.MENU_ENTRY,
			name = function()
				return OnOff(color.highlight("S") ..
				    "ingle user:", core.su)
			end,
			func = core.setSingleUser,
			alias = {"s", "S"},
		},
		-- verbose boot
		{
			entry_type = core.MENU_ENTRY,
			name = function()
				return OnOff(color.highlight("V") ..
				    "erbose    :", core.verbose)
			end,
			func = core.setVerbose,
			alias = {"v", "V"},
		},
	},
}

menu.welcome = {
	entries = function()
		local menu_entries = menu.welcome.all_entries
		-- Swap the first two menu items on single user boot
		if core.isSingleUserBoot() then
			-- We'll cache the swapped menu, for performance
			if menu.welcome.swapped_menu ~= nil then
				return menu.welcome.swapped_menu
			end
			-- Shallow copy the table
			menu_entries = core.deepCopyTable(menu_entries)

			-- Swap the first two menu entries
			menu_entries[1], menu_entries[2] =
			    menu_entries[2], menu_entries[1]

			-- Then set their names to their alternate names
			menu_entries[1].name, menu_entries[2].name =
			    menu_entries[1].alternate_name,
			    menu_entries[2].alternate_name
			menu.welcome.swapped_menu = menu_entries
		end
		return menu_entries
	end,
	all_entries = {
		-- boot multi user
		{
			entry_type = core.MENU_ENTRY,
			name = color.highlight("B") .. "oot Multi user " ..
			    color.highlight("[Enter]"),
			-- Not a standard menu entry function!
			alternate_name = color.highlight("B") ..
			    "oot Multi user",
			func = function()
				core.setSingleUser(false)
				core.boot()
			end,
			alias = {"b", "B"},
		},
		-- boot single user
		{
			entry_type = core.MENU_ENTRY,
			name = "Boot " .. color.highlight("S") .. "ingle user",
			-- Not a standard menu entry function!
			alternate_name = "Boot " .. color.highlight("S") ..
			    "ingle user " .. color.highlight("[Enter]"),
			func = function()
				core.setSingleUser(true)
				core.boot()
			end,
			alias = {"s", "S"},
		},
		-- escape to interpreter
		{
			entry_type = core.MENU_RETURN,
			name = color.highlight("Esc") .. "ape to loader prompt",
			func = function()
				loader.setenv("autoboot_delay", "NO")
			end,
			alias = {core.KEYSTR_ESCAPE},
		},
		-- reboot
		{
			entry_type = core.MENU_ENTRY,
			name = color.highlight("R") .. "eboot",
			func = function()
				loader.perform("reboot")
			end,
			alias = {"r", "R"},
		},
		{
			entry_type = core.MENU_SEPARATOR,
		},
		{
			entry_type = core.MENU_SEPARATOR,
			name = "Options:",
		},
		-- kernel options
		{
			entry_type = core.MENU_CAROUSEL_ENTRY,
			carousel_id = "kernel",
			items = core.kernelList,
			name = function(idx, choice, all_choices)
				if #all_choices == 0 then
					return "Kernel: "
				end

				local is_default = (idx == 1)
				local kernel_name = ""
				local name_color
				if is_default then
					name_color = color.escapef(color.GREEN)
					kernel_name = "default/"
				else
					name_color = color.escapef(color.BLUE)
				end
				kernel_name = kernel_name .. name_color ..
				    choice .. color.default()
				return color.highlight("K") .. "ernel: " ..
				    kernel_name .. " (" .. idx .. " of " ..
				    #all_choices .. ")"
			end,
			func = function(_, choice, _)
				config.selectKernel(choice)
			end,
			alias = {"k", "K"},
		},
		-- boot options
		{
			entry_type = core.MENU_SUBMENU,
			name = "Boot " .. color.highlight("O") .. "ptions",
			submenu = menu.boot_options,
			alias = {"o", "O"},
		},
		-- boot environments
		{
			entry_type = core.MENU_SUBMENU,
			visible = function()
				return core.isZFSBoot() and
				    #core.bootenvList() > 1
			end,
			name = "Boot " .. color.highlight("E") .. "nvironments",
			submenu = menu.boot_environments,
			alias = {"e", "E"},
		},
	},
}

menu.default = menu.welcome
-- current_alias_table will be used to keep our alias table consistent across
-- screen redraws, instead of relying on whatever triggered the redraw to update
-- the local alias_table in menu.process.
menu.current_alias_table = {}

function menu.redraw(m)
	-- redraw screen
	screen.clear()
	screen.defcursor()
	menu.current_alias_table = drawer.drawscreen(m)
	screen_invalid = false
end

-- 'keypress' allows the caller to indicate that a key has been pressed that we
-- should process as our initial input.
function menu.process(m, keypress)
	assert(m ~= nil)

	-- Trigger a redraw if we've been invalidated.  Otherwise, we assume
	-- that this menu has already been drawn.
	if screen_invalid then
		menu.redraw(m)
	end

	while true do
		local key = keypress or io.getchar()
		keypress = nil

		-- Special key behaviors
		if (key == core.KEY_BACKSPACE or key == core.KEY_DELETE) and
		    m ~= menu.default then
			break
		elseif key == core.KEY_ENTER then
			core.boot()
			-- Should not return
		end

		key = string.char(key)
		-- check to see if key is an alias
		local sel_entry = nil
		for k, v in pairs(menu.current_alias_table) do
			if key == k then
				sel_entry = v
				break
			end
		end

		-- if we have an alias do the assigned action:
		if sel_entry ~= nil then
			-- Get menu handler
			local handler = menu.handlers[sel_entry.entry_type]
			if handler ~= nil then
				-- The handler's return value indicates if we
				-- need to exit this menu.  An omitted or true
				-- return value means to continue.
				if handler(m, sel_entry) == false then
					return
				end
			end
			-- If we got an alias key the screen is out of date...
			-- redraw it.
			menu.redraw(m)
		end
	end
end

function menu.run()
	if menu.skip() then
		core.autoboot()
		return
	end

	menu.redraw(menu.default)
	local autoboot_key = menu.autoboot()

	menu.process(menu.default, autoboot_key)

	screen.defcursor()
	print("Exiting menu!")
end

function menu.skip()
	if core.isSerialBoot() then
		return true
	end
	local c = string.lower(loader.getenv("console") or "")
	if c:match("^efi[ ;]") ~= nil or c:match("[ ;]efi[ ;]") ~= nil then
		return true
	end

	c = string.lower(loader.getenv("beastie_disable") or "")
	print("beastie_disable", c)
	return c == "yes"
end

function menu.autoboot()
	local ab = loader.getenv("autoboot_delay")
	if ab ~= nil and ab:lower() == "no" then
		return nil
	elseif tonumber(ab) == -1 then
		core.boot()
	end
	ab = tonumber(ab) or 10

	local x = loader.getenv("loader_menu_timeout_x") or 5
	local y = loader.getenv("loader_menu_timeout_y") or 22

	local endtime = loader.time() + ab
	local time

	repeat
		time = endtime - loader.time()
		screen.setcursor(x, y)
		print("Autoboot in " .. time ..
		    " seconds, hit [Enter] to boot" ..
		    " or any other key to stop     ")
		screen.defcursor()
		if io.ischar() then
			local ch = io.getchar()
			if ch == core.KEY_ENTER then
				break
			else
				-- erase autoboot msg
				screen.setcursor(0, y)
				print(string.rep(" ", 80))
				screen.defcursor()
				return ch
			end
		end

		loader.delay(50000)
	until time <= 0
	core.boot()

end

return menu