--[=[

= Simple Mission Framework for Hedgewars =

This is a simple library intended to make setting up simple missions an

easy task for Lua scripters. The entire game logic and coding is

abtracted away in a single function which you just need to feed

a large definition table in which you define gears, goals, etc.

This is ideal for missions in which you set up the entire scenario

from the start and don't need any complex in-mission events.

BUT! This is NOT suited for missions with scripted events, cut-scenes,

branching story, etc.

This library has the following features:

* Add teams, clans, hogs

* Spawn gears

* Sensible defaults for almost everything

* Set custom goals or use the default one (kill all enemies)

* Add non-goals to fail the mission

* Checks victory and failure automatically

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

the appropriate parameters.

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

]=]

HedgewarsScriptLoad("/Scripts/Locale.lua")

HedgewarsScriptLoad("/Scripts/Tracker.lua")

--[[

SimpleMission(params)

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

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

	Mandatory fields:

	- teams:		Table of teams. There must be 1-8 teams.

	Optional fields

	- ammoConfig		Table containing basic ammo values (default: infinite skip only)

	- initVars		Table where you set up environment parameters such as MinesNum.

	- wind			If set, the wind will permanently set to this value (-100..100). Implies gfDisableWind

	- gears:		Table of objects.

	- girders		Table of girders

	- rubbers		Table of rubbers

	AMMO

	- ammoType		ammo type

	- delay			delay (default: 0)

	- numberInCrate		ammo per crate (default: 1)

	- count			default starter ammo for everyone, 9 for infinite (default: 0)

	- probability		probability in crates (default: 0)

	TEAM DATA

	- hogs			table of hedgehogs in this team (must contain at least 1 hog)

	- clanID		ID of the clan to which this team belongs to. Counting starts at 0.

				By default, each team goes into its own clan.

				Important: The clan of the player and allies MUST be 0.

				Important: You MUST either set the clan ID explicitly for all teams or none of them.

	- flag			flag name (default: hedgewars)

	- grave			grave name (has default grave for each team)

	- fort			fort name (default: Castle)

	HEDGEHOG DATA:

	- id			optional identifier for goals

	- x, y			hog position (default: spawns randomly on land)

	- poisoned		if true, hedgehog starts poisoned with 5 poison damage. Set to a number for other poison damage (default: false)

	- frozen		if true, hedgehogs starts frozen (default: false)

	- faceLeft		initial facing direction. true=left, false=false (default: false)

	GEAR TYPES:

	- type			gear type

	ALL types:

		id		optional identifier for goals

		x		x coordinate of starting position (default: 0)

		y		y coordinate of starting position (default: 0)

		dx		initial x speed (default: 0)

		dy		initial y speed (default: 0)

	- type=gtMine		Mine

		timer 		Mine timer (only for non-duds). Default: MinesTime

		isDud		Whether the mine is a dud. default: false

		isFrozen	Whether the mine is frozen. If true, it implies being a dud as well. Default: false

		health 		Initial health of dud mines. Has no effect if isDud=false. Default: 36

	- type=gtSMine		Sticky mine

		timer		Timer. Default: 500

	- type=gtAirMine	Air mine

		timer		Timer. Default: (MinesTime/1000 * 250)

	- type=gtExplosives	Barrel

		health		Initial health. Default: 60

		isFrozen	Whether the barrel is frozen. Default: true with health > 60, false otherwise

		isRolling	Whether the barrel starts in “rolling” state. Default: false

	- type=gtCase		Crate

		crateType	"health": Health crate

				"supply": Ammo or utility crate (select crate type automatically)

				"supply_ammo_explicit": Ammo crate (not recommened)

				"supply_utility_explicit": Utility crate (not recommededn)

		ammoType	Contained ammo (only for ammo and utility crates).

		health		Contained health (only for health crates). Default: HealthCaseAmount

		isFrozen	Whether the crate is frozen. Default: false

	- type=gtKnife		Cleaver

	- type=gtTarget		Target

	GOALS:

	Note: If there are at least two opposing teams, a default goal is used, which is to defeat all the enemies of the

	player's team. If this is what you want, you can skip this section.

	The default goal is overwritten as if customGoals has been set. Set customGoals and other related parameters for

	defining your own special goals. In this case, the mission is won if all customGoals are completed.

	Note the mission will always fail if the player's hedgehogs and all their allies have been defeated.

	If there is only one team (for the player), there is no default goal and one must be set explicitly.

	- customGoals		Table of custom goals (see below). All of them must be met to win. Some goal types might fail,

				rendering the mission unwinnable and leading to the loss of the mission. An example is

				blowing up a crate which you should have collected.ed.

	- customNonGoals	Table of non-goals, the player loses if one of them is achieved

	- customGoalCheck	When to check goals and non-goals. Values: "instant" (default), "turnStart", "turnEnd"

	- missionTitle:		The name of the mission (highly recommended)

	- missionIcon:		Icon of the mission panel, see documentation of ShowMission in the Lua API

	- goalText:		A short string explaining the goal of the mission (use this if you set custom goals).

	GOAL TYPES:

	- type			name of goal type

	- failText		Optional. For non-goals, this text will be shown in the stats if mission fails due to this non-goal

				being completed. For goals which fail, this text will be displayed at failure. Note that

				all normal goals have sensible default fail texts.

	- type="destroy"	Gear must be destroyed

		- id		Gear to destroy

	- type="teamDefeat"	Team must be defeated

		- teamName	Name of team to defeat

	- type="collect"	Crate must be collected

		FAIL CONDITION:	Crate taken by enemy, or destroyed

		- id		ID of crate gear to collect

		- collectors	Optional table of gear IDs, any one of which must collect the gear (but nobody else!).

				By default, this is for the player's teams and allies.

	- type="turns"		Achieved when a number of turns has been played

		- turns 	Number of played turns 

	- type="rounds"		Achieved when a number of rounds has been played

		- rounds	Number of played rounds

	- type="suddenDeath"	Sudden Death has started

	- type="inZone"		A gear is within given coordinate bounds. Each of xMin, xMax, yMin and yMax is a sub-goal.

				Each sub-goal is only checked if not nil.

				You can use this to check if a gear left, right, above or below a given coordinate.

				To check if the gear is within a rectangle, just set all 4 sub-goals.

		FAIL CONDITION:	Gear destroyed

		- id		Gear to watch

		- xMin		gear's X coordinate must be lower than this

		- xMax		gear's X coordinate must be higher than this

		- yMin		gear's Y coordinate must be lower than this

		- yMax		gear's Y coordinate must be higher than this

	- type="distGearPos"	Distance between a gear and a fixed position

		FAIL CONDITION:	Gear destroyed

		- distance	goal distance to compare to

		- relationship	"greaterThan" or "lowerThan"

		- id		gear to watch

		- x		x coordinate to reach

		- y		y coordinate to reach

	- type="distGearGear"	Distance between two gears

		FAIL CONDITION:	Any of both gears destroyed

		- distance	goal distance to compare to

		- relationship	"greaterThan" or "lowerThan"

		- id1		first gear to compare

		- id2		second gear to compare

	- type="damage"		Gear took damage or was destroyed

		- id		Gear to watch

		- damage	Minimum amount of damage to take at a single blow. Default: 1

		- canDestroy	If false, this goal will fail if the gear was destroyed without taking the required damage

	- type="drown"		Gear has drowned

		FAIL CONDITION:	Gear destroyed by other means

		- id		Gear to watch

	- type="poison"		Gear must be poisoned

		FAIL CONDITION:	Gear destroyed

		- id		Gear to be poisoned

	- type="cure"		Gear must exist and be free from poisoning

		FAIL CONDITION:	Gear destroyed

		- id		Gear to check

	- type="freeze"		Gear must exist and be frozen

		FAIL CONDITION:	Gear destroyed

		- id		Gear to be frozen

	- type="melt"		Gear must exist and be unfrozen

		FAIL CONDITION:	Gear destroyed

		- id		Gear to check

	- type="waterSkip"	Gear must have skipped over water

		FAIL CONDITION:	Gear destroyed before it reached the required number of skips

		- id

		- skips		Total number of water skips required at least (default: 1)

]]

local goals

local teamHogs = {}

--[[

	HELPER VARIABLES

]]

local defaultGraves = {

	"Grave", "Statue", "pyramid", "Simple", "skull", "Badger", "Duck2", "Flower"

}

local defaultFlags = {

	"hedgewars", "cm_birdy", "cm_eyes", "cm_spider", "cm_kiwi", "cm_scout", "cm_skull", "cm_bars"

}

-- Utility functions

-- Returns value if it is non-nil, otherwise returns default

local function def(value, default)

	if value == nil then

		return default

	else

		return value

	end

end

-- Get hypotenuse of a triangle with legs x and y

local function hypot(x, y)

	local t

	x = math.abs(x)

	y = math.abs(y)

	t = math.min(x, y)

	x = math.max(x, y)

	if x == 0 then

		return 0

	end

	t = t / x

	return x * math.sqrt(1 + t * t)

end

local errord = false

-- This function generates the mission. See above for the meaning of params.

function SimpleMission(params)

	if params.missionTitle == nil then

		params.missionTitle = loc("Scenario")

	end

	if params.missionIcon == nil then

		params.missionIcon = 1 -- target icon

	end

	if params.goalText == nil then

		params.goalText = loc("Eliminate the enemy.")

	end

	if params.customGoalCheck == nil and (params.customGoals ~= nil or params.customNonGoals ~= nil) then

		params.customGoalCheck = "instant"

	end

	_G.sm = {}

	_G.sm.isInSuddenDeath = false

	-- Number of completed turns

	_G.sm.gameTurns = 0

	_G.sm.goalGears = {}

	_G.sm.params = params

	_G.sm.gameEnded = false

	_G.sm.playerClan = 0

	_G.sm.wonVarWritten = false

	_G.sm.makeStats = function(winningClan, customAchievements)

		for t=0, TeamsCount-1 do

			local team = GetTeamName(t)

			local stats = GetTeamStats(team)

			local clan = GetTeamClan(team)

			if clan == winningClan then

				SendStat(siPlayerKills, stats.Kills, team)

			end

		end

		for t=0, TeamsCount-1 do

			local team = GetTeamName(t)

			local stats = GetTeamStats(team)

			local clan = GetTeamClan(team)

			if clan ~= winningClan then

				SendStat(siPlayerKills, stats.Kills, team)

			end

		end

		if customAchievements ~= nil then

			for a=1, #customAchievements do

				SendStat(siCustomAchievement, customAchievements[a])

			end

		end

	end

	_G.sm.criticalGearFailText = function(gearSmid)

		local gear = _G.sm.goalGears[gearSmid]

		if GetGearType(gear) == gtHedgehog then

			return string.format(loc("%s is dead, who was critical to this mission!"), GetHogName(gear))

		else

			return loc("We have lost an object which was critical to this mission.")

		end

	end

	_G.sm.checkGoal = function(goal)

		if goal.type == "destroy" then

			return getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed")

		elseif goal.type == "collect" then

			local collector = getGearValue(_G.sm.goalGears[goal.id], "sm_collected")

			if collector then

				if not goal.collectors then

					if GetHogClan(collector) == _G.sm.playerClan then

						return true

					else

						-- Fail if the crate was collected by enemy

						return "fail", loc("The enemy has taken a crate which we really needed!")

					end

				else

					for c=1, #goal.collectors do

						if _G.sm.goalGears[goal.collectors[c]] == collector then

							return true

						end

					end

					-- Fail if the crate was collected by someone who was not supposed to get it

					return "fail", loc("The wrong hedgehog has taken the crate.")

				end

			else

				-- Fail goal if crate was destroyed

				if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

					return "fail", loc("A crate critical to this mission has been destroyed.")

				end

				return false

			end

		elseif goal.type == "turns" then

			return sm.gameTurns >= goal.turns

		elseif goal.type == "rounds" then

			return (TotalRounds) >= goal.rounds

		elseif goal.type == "inZone" then

			if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			local gX, gY = GetGearPosition(_G.sm.goalGears[goal.id])

			-- 4 sub-goals, each optional

			local g1 = (not goal.xMin) or gX >= goal.xMin

			local g2 = (not goal.xMax) or gX <= goal.xMax

			local g3 = (not goal.yMin) or gY >= goal.yMin

			local g4 = (not goal.yMax) or gY <= goal.yMax

			return g1 and g2 and g3 and g4

		elseif goal.type == "distGearPos" or goal.type == "distGearGear" then

			local gX, gY, tX, tY

			if goal.type == "distGearPos" then

				if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

					-- Fail if gear was destroyed

					return "fail", criticalGearFailText(goal.id)

				end

				gX, gY = GetGearPosition(_G.sm.goalGears[goal.id])

				tX, tY = goal.x, goal.y

			elseif goal.type == "distGearGear" then

				-- Fail if one of the gears was destroyed

				if getGearValue(_G.sm.goalGears[goal.id1], "sm_destroyed") then

					return "fail", criticalGearFailText(goal.id1)

				elseif getGearValue(_G.sm.goalGears[goal.id2], "sm_destroyed") then

					return "fail", criticalGearFailText(goal.id2)

				end

				gX, gY = GetGearPosition(_G.sm.goalGears[goal.id1])

				tX, tY = GetGearPosition(_G.sm.goalGears[goal.id2])

			end

			local h = hypot(gX - tX, gY - tY)

			if goal.relationship == "smallerThan" then

				return h < goal.distance

			elseif goal.relationship == "greaterThan" then

				return h > goal.distance

			end

			-- Invalid parameters!

			error("SimpleMission: Invalid parameters for distGearPos/distGearGear!")

			errord = true

			return false

		elseif goal.type == "suddenDeath" then

			return sm.isInSuddenDeath

		elseif goal.type == "damage" then

			local damage = goal.damage or 1

			local gear = _G.sm.goalGears[goal.id]

			local tookEnoughDamage = getGearValue(gear, "sm_maxDamage") >= damage

			if getGearValue(gear, "sm_destroyed") then

				-- Fail if gear was destroyed without taking enough damage first

				if not tookEnoughDamage and goal.canDestroy == false then

					if GetGearType(gear) == gtHedgehog then

						return "fail", string.format(loc("%s has been killed before taking enough damage first."), GetHogName(gear))

					else

						return "fail", loc("An object has been destroyed before it took enough damage.")

					end

				else

				-- By default, succeed if gear was destroyed

					return true

				end

			end

			return tookEnoughDamage

		elseif goal.type == "drown" then

			local drowned = getGearValue(_G.sm.goalGears[goal.id], "sm_drowned")

			-- Fail if gear was destroyed by something other than drowning

			if not drowned and getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			return drowned

		elseif goal.type == "poison" then

			if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			return GetEffect(_G.sm.goalGears[goal.id], hePoisoned) >= 1

		elseif goal.type == "freeze" then

			if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			return GetEffect(_G.sm.goalGears[goal.id], heFrozen) >= 256

		elseif goal.type == "cure" then

			if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			return GetEffect(_G.sm.goalGears[goal.id], hePoisoned) == 0

		elseif goal.type == "melt" then

			if getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			return GetEffect(_G.sm.goalGears[goal.id], heFrozen) == 0

		elseif goal.type == "waterSkip" then

			local skips = goal.skips or 1

			local hasEnoughSkips = getGearValue(_G.sm.goalGears[goal.id], "sm_waterSkips") >= skips

			-- Fail if gear was destroyed before it got the required number of skips

			if not hasEnoughSkips and getGearValue(_G.sm.goalGears[goal.id], "sm_destroyed") then

				return "fail", criticalGearFailText(goal.id)

			end

			return hasEnoughSkips

		elseif goal.type == "teamDefeat" then

			return #teamHogs[goal.teamName] == 0

		else

			return false

		end

	end

	--[[ Checks the custom goals.

	Returns true when all custom goals are met.

	Returns false when not all custom goals are met.

	Returns "fail" if any of the goals has failed (i.e. is impossible to complete).

	Returns nil when there are no custom goals ]]

	_G.sm.checkGoals = function()

		if params.customGoals ~= nil and #params.customGoals > 0 then

			for key, goal in pairs(params.customGoals) do

				local done, defaultFailText = _G.sm.checkGoal(goal)

				if done == false or done == "fail" then

					local failText

					if goal.failText then

						failText = goal.failText

					else

						failText = customFailText

					end

					return done, failText

				end

			end

			return true

		else

			return nil

		end

	end

	--[[ Checks the custom non-goals.

	Returns true when any non-goal is met.

	Returns false otherwise. ]]

	_G.sm.checkNonGoals = function()

		if params.customNonGoals ~= nil and #params.customNonGoals > 0 then

			for key, nonGoal in pairs(params.customNonGoals) do

				local done = _G.sm.checkGoal(nonGoal)

				if done == true then

					return true, nonGoal.failText

				end

			end

		end

		return false

	end

	-- Declare the game ended if all enemy teams are dead and player teams or allies are still alive

	_G.sm.checkRegularVictory = function()

		local victory = true

		for t=0, TeamsCount-1 do

			local team = GetTeamName(t)

			local defeat = _G.sm.checkGoal({type="teamDefeat", teamName=team})

			if not defeat then

				-- Deep check, also look at damage of all hogs

				local dead = 0

				for h=1, #teamHogs[team] do

					local _,_,_,_,_,_,_,_,_,_,_,Damage = GetGearValues(teamHogs[team][h])

					if Damage >= GetHealth(teamHogs[team][h]) then

						dead = dead + 1

					end

				end

				if dead >= #teamHogs[team] then

					defeat = true

				end

			end

			if (defeat == true) and (GetTeamClan(team) == _G.sm.playerClan) then

				victory = false

				break

			elseif (defeat == false) and (GetTeamClan(team) ~= _G.sm.playerClan) then

				victory = false

				break

			end

		end

		if victory then

			_G.sm.gameEnded = true

		end

	end

	-- Checks goals and non goals and wins or loses mission

	_G.sm.checkWinOrFail = function()

		if errord then

			return

		end

		local nonGoalStatus, nonGoalFailText = _G.sm.checkNonGoals()