--[=[

Target Practice Mission Framework for Hedgewars

This is a simple library intended to make setting up simple training missions a trivial

task requiring just. The library has been created to reduce redundancy in Lua scripts.

The training framework generates complete and fully usable training missions by just

one function call.

The missions generated by this script are all the same:

- The player will get a team with a single hedgehog.

- The team gets a single predefined weapon infinitely times.

- A fixed sequence of targets will spawn at predefined positions.

- When a target has been destroyed, the next target of the target sequence appears

- The mission ends successfully when all targets have been destroyed

- The mission ends unsuccessfully when the time runs out or the hedgehog dies

- When the mission ends, a score is awarded, based on the performance (hit targets,

  accuracy and remaining time) of the hedgehog. When not all targets are hit, there

  will be no accuracy and time bonuses.

To use this library, you first have to load it and to call TrainingMission once with

the appropriate parameters. Really, that’s all!

See the comment of TrainingMission for a specification of all parameters.

Below is a template for your convenience, you just have to fill in the fields and delete

optional arguments you don’t want.

----- snip -----

HedgewarsScriptLoad("/Scripts/Training.lua")

params = {

	missionTitle = ,

	map = ,

	theme = ,

	time = ,

	ammoType = ,

	gearType = ,

	secondaryGearType = ,

	targets = {

		{ x = , y = },

		{ x = , y = },

		-- etc.

	},

	wind = ,

	solidLand = ,

	artillery = ,

	clanColor = ,

	goalText = ,

	shootText =

}

TargetPracticeMission(params)

----- snip -----

]=]

HedgewarsScriptLoad("/Scripts/Utils.lua")

HedgewarsScriptLoad("/Scripts/Locale.lua")

local player = nil

local scored = 0

local shots = 0

local end_timer = 1000

local game_lost = false

local time_goal = 0

local total_targets

local targets

local gearsInGameCount = 0

local gearsInGame = {}

--[[

TrainingMission(params)

This function sets up the *entire* training mission and needs one argument: params.

The argument “params” is a table containing fields which describe the training mission.

	mandatory fields:

	- missionTitle:	the name of the mission

	- map:		the name map to be used

	- theme:	the name of the theme (does not need to be a standalone theme)

	- time:		the time limit in milliseconds

	- ammoType:	the ammo type of the weapon to be used

	- gearType:	the gear type of the gear which is fired (used to count shots and re-center camera)

	- targets:	The coordinates of where the targets will be spawned.

			It is a table containing tables containing coordinates of format

			{ x=value, y=value }. The targets will be spawned in the same

			order as specified the coordinate tables appear. Example:

				targets = {

					{ x = 324, y = 43 },

					{ x = 123, y = 56 },

					{ x = 6, y = 0 },

				}

			There must be at least 1 target.

	optional fields:

	- wind:		the initial wind (-100 to 100) (default: 0 (no wind))

	- solidLand:	weather the terrain is indestructible (default: false)

	- artillery:	if true, the hog can’t move (default: false)

	- secGearType:	cluster of projectile gear (if present) (used to re-center camera)

	- clanColor:	color of the (only) clan (default: -1, default first clan color)

	- goalText:	A short string explaining the goal of the mission

			(default: "Destroy all targets within the time!")

	- shootText:	A string which says how many times the player shot, “%d” is replaced

			by the number of shots. (default: "You have shot %d times.")

]]

local getTargetsScore = function()

	return scored * math.ceil(6000/#targets)

end

function TargetPracticeMission(params)

	if params.goalText == nil then params.goalText = loc("Eliminate all targets before your time runs out.|You have unlimited ammo for this mission.") end

	if params.shootText == nil then params.shootText = loc("You have shot %d times.") end

	if params.clanColor == nil then params.clanColor = -1 end

	if params.wind == nil then params.wind = 0 end

	local solid, artillery

	if params.solidLand == true then solid = gfSolidLand else solid = 0 end

	if params.artillery == true then artillery = gfArtillery else artillery = 0 end

	targets = params.targets

	total_targets = #targets

	_G.onAmmoStoreInit = function()

		SetAmmo(params.ammoType, 9, 0, 0, 0)

	end

	_G.onGameInit = function()

		Seed = 1

		ClearGameFlags()

		local attackMode

		if (params.ammoType == amBee) then

			attackMode = gfInfAttack

		else

			attackMode = gfMultiWeapon

		end

		EnableGameFlags(gfDisableWind, attackMode, gfOneClanMode, solid, artillery)

		TurnTime = params.time

		Map = params.map

		Theme = params.theme

		Goals = params.goalText

		CaseFreq = 0

		MinesNum = 0

		Explosives = 0

		-- Disable Sudden Death

		WaterRise = 0

		HealthDecrease = 0

		SetWind(params.wind)

		AddMissionTeam(params.clanColor)

		player = AddMissionHog(1)

		SetGearPosition(player, params.hog_x, params.hog_y)

	end

	_G.onGameStart = function()

		SendHealthStatsOff()

		local recordInfo = getReadableChallengeRecord("Highscore")

		ShowMission(params.missionTitle, loc("Aiming practice"), params.goalText .. "|" .. recordInfo, -params.ammoType, 5000)

		SetTeamLabel(GetHogTeamName(player), "0")

		spawnTarget()

	end

	_G.onNewTurn = function()

		SetWeapon(params.ammoType)

	end

	_G.spawnTarget = function()

		local gear = AddGear(0, 0, gtTarget, 0, 0, 0, 0)

		local x = targets[scored+1].x

		local y = targets[scored+1].y

		SetGearPosition(gear, x, y)

		return gear

	end

	_G.onGameTick20 = function()

		if TurnTimeLeft < 40 and TurnTimeLeft > 0 and scored < total_targets and game_lost == false then

			game_lost = true

			AddCaption(loc("Time’s up!"), capcolDefault, capgrpGameState)

			SetHealth(player, 0)

			time_goal = 1

		end

		if band(GetState(player), gstDrowning) == gstDrowning and game_lost == false and scored < total_targets then

			game_lost = true

			time_goal = 1

		end

		if scored == total_targets  or game_lost then

			if end_timer == 0 then

				generateStats()

				EndGame()

			end

			end_timer = end_timer - 20

		end

		for gear, _ in pairs(gearsInGame) do

			if band(GetState(gear), gstDrowning) ~= 0 then

				-- Re-center camera on hog if projectile gears drown

				gearsInGame[gear] = nil

				gearsInGameCount = gearsInGameCount - 1

				if gearsInGameCount == 0 and GetHealth(CurrentHedgehog) then

					FollowGear(CurrentHedgehog)

				end

			end

		end

	end

	_G.onGearAdd = function(gear)

		if GetGearType(gear) == params.gearType then

			shots = shots + 1

		end

		if GetGearType(gear) == params.gearType or (params.secGearType and GetGearType(gear) == params.secGearType) then

			gearsInGameCount = gearsInGameCount + 1

			gearsInGame[gear] = true

		end

	end

	_G.onGearDamage = function(gear, damage)

		if GetGearType(gear) == gtTarget then

			scored = scored + 1

			SetTeamLabel(GetHogTeamName(player), tostring(getTargetsScore()))

			if scored < total_targets then

				AddCaption(string.format(loc("Targets left: %d"), (total_targets-scored)), capcolDefault, capgrpMessage)

				spawnTarget()

			else

				if not game_lost then

					SaveMissionVar("Won", "true")

					AddCaption(loc("You have destroyed all targets!"), capcolDefault, capgrpGameState)

					ShowMission(params.missionTitle, loc("Aiming practice"), loc("Congratulations! You have destroyed all targets within the time."), 0, 0)

					PlaySound(sndVictory, player)

					SetEffect(player, heInvulnerable, 1)

					SetState(player, bor(GetState(player), gstWinner))

					time_goal = TurnTimeLeft

					-- Disable control

					SetInputMask(0)

					AddAmmo(player, params.ammoType, 0)

					SetTurnTimePaused(true)

				end

			end

		end

		if GetGearType(gear) == gtHedgehog then

			if not game_lost then

				game_lost = true

				SetHealth(player, 0)

				time_goal = 1

			end

		end

	end

	_G.onGearDelete = function(gear)

		if GetGearType(gear) == gtTarget and band(GetState(gear), gstDrowning) ~= 0 then

			AddCaption(loc("You lost your target, try again!"), capcolDefault, capgrpGameState)

			local newTarget = spawnTarget()

			local x, y = GetGearPosition(newTarget)

			local success = PlaceSprite(x, y + 24, sprAmGirder, 0, 0xFFFFFFFF, false, false, false)

			if not success then

				WriteLnToConsole("ERROR: Failed to spawn girder under respawned target!")

			end

		elseif gearsInGame[gear] then

			gearsInGame[gear] = nil

			gearsInGameCount = gearsInGameCount - 1

			if gearsInGameCount == 0 and GetHealth(CurrentHedgehog) then

				-- Re-center camera to hog after all projectile gears were destroyed

				FollowGear(CurrentHedgehog)

			end

		end

	end

	_G.generateStats = function()

		local end_score_targets = getTargetsScore()

		local end_score_overall

		if not game_lost then

			local end_score_time = math.ceil(time_goal/(params.time/6000))

			end_score_overall = end_score_time + end_score_targets + end_score_accuracy

			SetTeamLabel(GetHogTeamName(player), tostring(end_score_overall))

			SendStat(siGameResult, loc("You have finished the target practice!"))

			SendStat(siCustomAchievement, string.format(loc("You have destroyed %d of %d targets (+%d points)."), scored, total_targets, end_score_targets))

			SendStat(siCustomAchievement, string.format(params.shootText, shots))

			SendStat(siCustomAchievement, string.format(loc("You had %.1fs remaining on the clock (+%d points)."), (time_goal/1000), end_score_time))

		else

			SendStat(siGameResult, loc("Challenge over!"))

			SendStat(siCustomAchievement, string.format(loc("You have destroyed %d of %d targets (+%d points)."), scored, total_targets, end_score_targets))

			SendStat(siCustomAchievement, string.format(params.shootText, shots))

			if(shots > 0) then

				SendStat(siCustomAchievement, string.format(loc("Your accuracy was %.1f%%."), accuracy))

			end

			end_score_overall = end_score_targets

		end

		SendStat(siPointType, "!POINTS")

		SendStat(siPlayerKills, tostring(end_score_overall), GetHogTeamName(player))

		-- Update highscore

		updateChallengeRecord("Highscore", end_score_overall)

	end

end