extends Node2D

# Signals
signal game_energy_changed
signal game_deck_changed
signal game_discard_changed
signal game_hand_changed
signal game_state_changed

var DEBUG = true
# class member variables go here, for example:
# var a = 2
# var b = "textvar"
var energy = 100
const ENERGY_MAX = 100
const ENERGY_MIN = 0
const SHUFFLE_REPEATS = 3
const STARTING_DECK_SIZE = 10

# Card piles: hand, deck, discard
var max_hand_size = 5
var hand = []
# Index 0 = bottom for deck and discard
var deck = []
var discard = []

# Game state machine ish
var actions_per_round = 1
var actions_remaining = 1
var round_counter = 0
var game_state = -2
var game_win = false
var game_over_message = ''
var game_states = {
	-2: "initializing",
	-1: "round_start",
	0: "waiting_player_action",
	1: "playing_action",
	2: "round_done",
	3: "waiting", # Generic let something else finish
	4: "event", # Some out of player control event
	5: "over",
}

# Cards
var cards = {
	"card_repair": preload("res://cards/card_repair.tscn"),
}

func _ready():
	# Called every time the node is added to the scene.
	# Initialization here
	randomize()
	var bar = get_node("ui/EnergyHolder/ProgressBar")
	bar.set_min(ENERGY_MIN)
	bar.set_max(ENERGY_MAX)
	set_process(true)
	if self.DEBUG:
		get_node('ui/debug').show()
	init_game()

func init_game():
	# Popuplate deck
	var card_keys = self.cards.keys()
	while self.deck.size() < STARTING_DECK_SIZE:
		var node = self.cards[card_keys[rand_range(0, card_keys.size() - 1)]].instance()
		node.add_to_group('cards')
		get_node('cards').add_child(node)
		node.hide()
		self.deck.append(node)
	self.shuffle()
	emit_signal('game_deck_changed', self.deck.size())
	self.update_game_state(-1)

func update_game_state(new_state_idx):
	if ! self.game_states.has(new_state_idx):
		print("Error: trying to change game_state to unknown index: %d" % new_state_idx)
		return
	var old_state = self.game_state
	self.game_state = new_state_idx
	print("Changed game state from %d to %d" % [old_state, new_state_idx])
	emit_signal('game_state_changed', old_state, new_state_idx)

func _process():
	pass
	
func update_energy(diff = 0):
	self.energy += diff
	emit_signal("game_energy_changed", self.energy)
	if self.energy <= 0:
		self.game_win = false
		self.game_over_message = 'Ran out of energy.... your ship is floating useless and dead in space'
		self.update_game_state(5)
		return true
	return false

func draw_hand(cmax = null):
	if not cmax:
		cmax = self.max_hand_size
	var success = false
	while self.hand.size() < cmax:
		success = self.draw_card()
		if not success:
			break

func draw_card():
	"""
	returns bool: true if a card was drawn
	"""
	if self.hand.size() >= self.max_hand_size:
		return false # Can't exceed max hand size
	print(self.deck.size())
	if self.deck.size() == 0:
		self.shuffle_in_discard()
		if self.deck.empty():
			return false # Deck + Discard is milled out
	var c = self.deck[-1]
	self.deck.pop_back()
	self.hand.push_back(c)
	emit_signal("game_deck_changed", self.deck.size())
	emit_signal("game_hand_changed", self.hand.size())
	return true
	
func shuffle_in_discard():
	while not self.discard.empty():
		self.deck.push_back(self.discard[-1])
		self.discard.pop_back()
	emit_signal("game_discard_changed", self.discard.size())
	self.shuffle()

func shuffle():
	if self.DEBUG:
		print("--- start shuffle ---")
		print(self.deck)
	for i in range(1, SHUFFLE_REPEATS):
		var new_deck = []
		var x
		while not self.deck.empty():
			x = rand_range(0, self.deck.size()-1)
			new_deck.append(self.deck[x])
			self.deck.remove(x)
		self.deck = new_deck
	if self.DEBUG:
		print(self.deck)
		print("--- end shuffle ---")

func _on_game_game_state_changed(old_state, new_state):
	if new_state == -1:
		# New Round
		self.round_counter += 1
		self.actions_remaining = self.actions_per_round
		self.draw_hand()
		emit_signal("game_round_start", self.round_counter)
		self.update_game_state(0) # Waiting for player action
	if new_state == 3: # Round done
		var state_changed = self.update_energy(-get_round_energy_cost())
		if not state_changed:
			self.update_game_state(-1)
	if new_state == 5: # Game finish
		get_node('ui/help').set_text(self.game_over_message)
		
func play_card(card):
	if self.game_state != 0:
		return
	card.hide()
	card.set_global_pos(Vector2(-200,-200))
	var p = self.hand.find(card)
	print(p)
	if p != -1:
		self.hand.remove(p)
		self.discard.append(card)
		print(self.hand)
		print(self.discard)
		emit_signal('game_hand_changed', self.hand.size())
		emit_signal('game_discard_changed', self.discard.size())
	card.proc_effects(self, 'on_card_play_done')
	self.update_game_state(1) # playing action
	
func on_card_play_done(card):
	self.actions_remaining -= 1
	if self.actions_remaining <= 0:
		self.update_game_state(3)
		
func get_round_energy_cost():
	# @TODO base on enabled areas
	return 10