# Player.gd
# Steuert den Spielercharakter: Bewegung, Kamera, HP, Angriff, Zielauswahl
extends CharacterBody3D

const SPEED = 5.0
const JUMP_VELOCITY = 4.5
const GRAVITY = 9.8

# Charakter-Klasse und Level-System
@export var character_class: CharacterClass
var level: int = 1
var current_xp: int = 0
var xp_to_next_level: int = 100  # XP benötigt für Level 2

# Aktuelle Stats (berechnet aus Klasse + Level)
var strength: int = 10
var agility: int = 10
var intelligence: int = 10
var stamina: int = 10
var armor: int = 0  # Rüstung aus Ausrüstung

# Level-Differenz Konstanten
const LEVEL_DIFF_DAMAGE_MOD = 0.1  # 10% mehr/weniger Schaden pro Level-Differenz
const MAX_LEVEL_DIFF_MOD = 0.5  # Maximal 50% Modifikation

var max_hp = 100
var current_hp = 100
var target = null          # Aktuell markierter Gegner

# Equipment System
var equipment: Dictionary = {
	Equipment.Slot.HEAD: null,
	Equipment.Slot.CHEST: null,
	Equipment.Slot.HANDS: null,
	Equipment.Slot.LEGS: null,
	Equipment.Slot.FEET: null,
	Equipment.Slot.WEAPON: null,
	Equipment.Slot.OFFHAND: null
}

# Inventar System
var inventory: Inventory = Inventory.new()

# Global Cooldown System (GCD) - gilt für alle Aktionen inkl. Autoattack
var global_cooldown = 0.0
const BASE_GCD = 1.5  # Basis-GCD in Sekunden (wird durch Haste modifiziert)
var haste: float = 0.0  # Angriffsgeschwindigkeits-Bonus (0.1 = 10% schneller)

# Autoattack System
var autoattack_active = false  # Ob Autoattack aktiv ist

# Skills System - individuelle Cooldowns (zusätzlich zum GCD)
var heavy_strike_cooldown = 0.0
const HEAVY_STRIKE_DAMAGE_MIN = 10
const HEAVY_STRIKE_DAMAGE_MAX = 15
const HEAVY_STRIKE_COOLDOWN = 3.0
const HEAVY_STRIKE_RANGE = 4.0

@onready var camera_pivot = $CameraPivot
@onready var camera = $CameraPivot/Camera3D
@onready var hud = $HUD
@onready var character_panel = $CharacterPanel
@onready var inventory_panel = $InventoryPanel
@onready var loot_window = $LootWindow

func _ready():
	# Stats aus Klasse berechnen
	_calculate_stats()
	current_hp = max_hp

	hud.update_health(current_hp, max_hp)
	hud.update_level(level, current_xp, xp_to_next_level)
	hud.set_active_slot(0)
	# Icons für Skills setzen
	hud.set_slot_icon(0, "res://icons/autoattack_icon.svg")  # Slot 1: Autoattack
	hud.set_slot_icon(1, "res://icons/heavy_strike_icon.svg")  # Slot 2: Heavy Strike

	# HUD-Klicks verbinden
	hud.slot_clicked.connect(_on_slot_clicked)

	# Inventar Panel initialisieren
	inventory_panel.setup(self)

	# Loot Window initialisieren
	loot_window.setup(self)

	# Gold im HUD aktualisieren wenn sich Gold ändert
	inventory.gold_changed.connect(func(amount): hud.update_gold(amount))

# Stats basierend auf Klasse und Level berechnen
func _calculate_stats():
	if character_class == null:
		# Fallback ohne Klasse
		strength = 10
		agility = 10
		intelligence = 10
		stamina = 10
		max_hp = 100
		return

	# Stats = Basis + (Level-1) * Zuwachs pro Level
	var levels_gained = level - 1
	strength = character_class.base_strength + int(levels_gained * character_class.strength_per_level)
	agility = character_class.base_agility + int(levels_gained * character_class.agility_per_level)
	intelligence = character_class.base_intelligence + int(levels_gained * character_class.intelligence_per_level)
	stamina = character_class.base_stamina + int(levels_gained * character_class.stamina_per_level)

	# HP aus Stamina berechnen
	max_hp = stamina * CharacterClass.HP_PER_STAMINA

	# Equipment-Boni hinzufügen
	_apply_equipment_stats()

	print("Stats berechnet - STR: ", strength, " AGI: ", agility, " INT: ", intelligence, " STA: ", stamina, " ARM: ", armor, " HP: ", max_hp)

# Equipment-Stats auf Charakter anwenden
func _apply_equipment_stats():
	armor = 0
	haste = 0.0
	var bonus_str = 0
	var bonus_agi = 0
	var bonus_int = 0
	var bonus_sta = 0

	for slot in equipment.keys():
		var item = equipment[slot]
		if item != null:
			armor += item.armor
			haste += item.haste
			bonus_str += item.strength
			bonus_agi += item.agility
			bonus_int += item.intelligence
			bonus_sta += item.stamina

	strength += bonus_str
	agility += bonus_agi
	intelligence += bonus_int
	stamina += bonus_sta

	# HP neu berechnen mit Equipment-Stamina
	max_hp = stamina * CharacterClass.HP_PER_STAMINA

# Equipment anlegen
func equip_item(item: Equipment) -> Equipment:
	var old_item = equipment[item.slot]
	equipment[item.slot] = item
	_calculate_stats()
	# HP proportional anpassen
	if max_hp > 0:
		current_hp = mini(current_hp, max_hp)
	hud.update_health(current_hp, max_hp)
	character_panel.update_stats(self)
	print("Ausgerüstet: ", item.item_name, " in Slot ", Equipment.get_slot_name(item.slot))
	return old_item

# Equipment ablegen
func unequip_slot(slot: Equipment.Slot) -> Equipment:
	var old_item = equipment[slot]
	if old_item == null:
		return null
	equipment[slot] = null
	_calculate_stats()
	current_hp = mini(current_hp, max_hp)
	hud.update_health(current_hp, max_hp)
	character_panel.update_stats(self)
	print("Abgelegt: ", old_item.item_name)
	return old_item

# Ausgerüstete Waffe holen
func get_equipped_weapon() -> Equipment:
	return equipment[Equipment.Slot.WEAPON]

# Main-Stat für Schadensberechnung holen
func get_main_stat() -> int:
	if character_class == null:
		return 10
	match character_class.main_stat:
		CharacterClass.MainStat.STRENGTH:
			return strength
		CharacterClass.MainStat.AGILITY:
			return agility
		CharacterClass.MainStat.INTELLIGENCE:
			return intelligence
	return 10

# XP erhalten und Level-Up prüfen
func gain_xp(amount: int):
	current_xp += amount
	print("+" , amount, " XP (", current_xp, "/", xp_to_next_level, ")")

	while current_xp >= xp_to_next_level:
		_level_up()

	hud.update_level(level, current_xp, xp_to_next_level)

# Level-Up durchführen
func _level_up():
	current_xp -= xp_to_next_level
	level += 1
	xp_to_next_level = _calculate_xp_for_level(level + 1)

	# Stats neu berechnen
	_calculate_stats()

	# HP vollständig auffüllen bei Level-Up
	current_hp = max_hp

	hud.update_health(current_hp, max_hp)
	# Character Panel aktualisieren falls offen
	character_panel.update_stats(self)
	print("LEVEL UP! Jetzt Level ", level, " - HP voll aufgefüllt!")

# XP-Kurve: Jedes Level braucht mehr XP
func _calculate_xp_for_level(target_level: int) -> int:
	return 100 * target_level  # Level 2: 100, Level 3: 200, etc.

# Handler für HUD-Slot-Klicks
func _on_slot_clicked(slot_index: int):
	match slot_index:
		0:  # Autoattack manuell starten
			if target != null and global_cooldown <= 0:
				start_autoattack()
				perform_autoattack()
		1:  # Heavy Strike
			use_heavy_strike()

# Schaden am Spieler abziehen und HP-Leiste aktualisieren
func take_damage(amount):
	current_hp = clamp(current_hp - amount, 0, max_hp)
	hud.update_health(current_hp, max_hp)
	if current_hp <= 0:
		die()

# Schaden mit Rüstung und Level-Differenz berechnen
func calculate_incoming_damage(raw_damage: int, attacker_level: int, is_melee: bool) -> int:
	var damage = float(raw_damage)

	# Rüstung reduziert nur Nahkampfschaden
	if is_melee and armor > 0:
		var armor_reduction = float(armor) / (float(armor) + 50.0)
		damage = damage * (1.0 - armor_reduction)

	# Level-Differenz Modifikator (Gegner höheres Level = mehr Schaden)
	var level_diff = attacker_level - level
	var level_mod = clamp(level_diff * LEVEL_DIFF_DAMAGE_MOD, -MAX_LEVEL_DIFF_MOD, MAX_LEVEL_DIFF_MOD)
	damage = damage * (1.0 + level_mod)

	return maxi(1, int(damage))

# Schaden mit vollem Schadenssystem nehmen
func take_damage_from(raw_damage: int, attacker_level: int, is_melee: bool = true):
	var final_damage = calculate_incoming_damage(raw_damage, attacker_level, is_melee)
	print("Spieler nimmt Schaden: ", raw_damage, " -> ", final_damage, " (nach Rüstung/Level)")
	take_damage(final_damage)

# HP heilen und HP-Leiste aktualisieren
func heal(amount):
	current_hp = clamp(current_hp + amount, 0, max_hp)
	hud.update_health(current_hp, max_hp)

# Loot empfangen und Fenster anzeigen
func receive_loot(loot: Dictionary, world_pos: Vector3):
	loot_window.show_loot(loot, world_pos)

func die():
	print("Spieler gestorben!")

# Schaden basierend auf ausgerüsteter Waffe + Main-Stat Skalierung
func get_attack_damage() -> int:
	var weapon = get_equipped_weapon()
	var base_damage: int
	if weapon == null:
		# Unbewaffneter Schaden klassenabhängig
		if character_class:
			base_damage = randi_range(character_class.unarmed_min_damage, character_class.unarmed_max_damage)
		else:
			base_damage = 1
	else:
		base_damage = randi_range(weapon.min_damage, weapon.max_damage)

	# Schaden skaliert mit Main-Stat
	var stat_bonus = int(get_main_stat() * CharacterClass.DAMAGE_PER_MAIN_STAT)
	return base_damage + stat_bonus

# Aktuellen GCD berechnen (mit Haste-Modifikator)
func get_current_gcd() -> float:
	var weapon = get_equipped_weapon()
	var base_speed: float
	if weapon == null:
		# Unbewaffnete Angriffsgeschwindigkeit klassenabhängig
		if character_class:
			base_speed = character_class.unarmed_attack_speed
		else:
			base_speed = BASE_GCD
	else:
		base_speed = weapon.attack_speed

	# Haste reduziert den GCD: GCD = Basis / (1 + Haste)
	# Bei 0.5 Haste (50%): 1.5s / 1.5 = 1.0s
	return base_speed / (1.0 + haste)

# DPS berechnen (für Anzeige)
func get_dps() -> float:
	var weapon = get_equipped_weapon()
	var avg_damage: float
	if weapon == null:
		# Unbewaffneter Durchschnittsschaden klassenabhängig
		if character_class:
			avg_damage = (character_class.unarmed_min_damage + character_class.unarmed_max_damage) / 2.0
		else:
			avg_damage = 1.0
	else:
		avg_damage = (weapon.min_damage + weapon.max_damage) / 2.0

	var stat_bonus = get_main_stat() * CharacterClass.DAMAGE_PER_MAIN_STAT
	var total_damage = avg_damage + stat_bonus
	var gcd = get_current_gcd()

	# DPS = Schaden / GCD
	return total_damage / gcd

# Reichweite basierend auf ausgerüsteter Waffe (unbewaffnet = 3.0)
func get_attack_range() -> float:
	var weapon = get_equipped_weapon()
	if weapon == null:
		return 3.0
	return weapon.weapon_range

# Ziel markieren — start_attack=true startet sofort die Autoattack
func set_target(new_target, start_attack: bool = false):
	if target != null and is_instance_valid(target):
		target.hide_health()
	target = new_target
	target.show_health()
	print("Ziel markiert: ", target.name)
	if start_attack:
		start_autoattack()
		if global_cooldown <= 0:
			perform_autoattack()

# Ziel komplett aufheben und Autoattack stoppen
func clear_target():
	if target != null and is_instance_valid(target):
		target.hide_health()
	target = null
	autoattack_active = false
	print("Ziel aufgehoben, Autoattack gestoppt")

# Autoattack aktivieren
func start_autoattack():
	autoattack_active = true
	print("Autoattack aktiviert")

# Autoattack deaktivieren
func stop_autoattack():
	autoattack_active = false
	print("Autoattack deaktiviert")

# Führt einen Autoattack aus (wird vom GCD-System aufgerufen)
func perform_autoattack():
	if target == null or not is_instance_valid(target):
		target = null
		autoattack_active = false
		return

	var distance = global_position.distance_to(target.global_position)
	if distance <= get_attack_range():
		var dmg = get_attack_damage()
		# Neues Schadenssystem mit Rüstung und Level-Differenz
		if target.has_method("take_damage_from"):
			target.take_damage_from(dmg, level, true)  # true = Nahkampf
		else:
			target.take_damage(dmg)
		print("Autoattack: ", dmg, " Schaden (GCD: %.2fs, DPS: %.1f)" % [get_current_gcd(), get_dps()])
		# GCD auslösen basierend auf Waffengeschwindigkeit + Haste
		trigger_global_cooldown()

# Global Cooldown auslösen (basierend auf Waffe + Haste)
func trigger_global_cooldown():
	global_cooldown = get_current_gcd()

# Heavy Strike: Starker Angriff mit Cooldown
func use_heavy_strike():
	if target == null or not is_instance_valid(target):
		print("Kein Ziel für Heavy Strike!")
		return

	# Nur Skill-eigener Cooldown Check (kein GCD-Check!)
	if heavy_strike_cooldown > 0:
		print("Heavy Strike noch im Cooldown: ", "%.1f" % heavy_strike_cooldown, "s")
		return

	var distance = global_position.distance_to(target.global_position)
	if distance > HEAVY_STRIKE_RANGE:
		print("Ziel zu weit entfernt für Heavy Strike!")
		return

	var base_damage = randi_range(HEAVY_STRIKE_DAMAGE_MIN, HEAVY_STRIKE_DAMAGE_MAX)
	var stat_bonus = int(get_main_stat() * CharacterClass.DAMAGE_PER_MAIN_STAT)
	var damage = base_damage + stat_bonus
	# Neues Schadenssystem mit Rüstung und Level-Differenz
	if target.has_method("take_damage_from"):
		target.take_damage_from(damage, level, true)  # true = Nahkampf
	else:
		target.take_damage(damage)
	heavy_strike_cooldown = HEAVY_STRIKE_COOLDOWN
	trigger_global_cooldown()  # GCD zurücksetzen damit Autoattack nicht sofort feuert
	start_autoattack()  # Autoattack nach Skill automatisch aktivieren
	print("Heavy Strike! ", damage, " Rohschaden")

# Raycast von der Kamera auf Mausposition — trifft Gegner mit take_damage()
func _try_select_target(start_attack: bool = false):
	var space_state = get_world_3d().direct_space_state
	var viewport = get_viewport()
	var mouse_pos = viewport.get_mouse_position()
	var ray_origin = camera.project_ray_origin(mouse_pos)
	var ray_end = ray_origin + camera.project_ray_normal(mouse_pos) * 100.0
	var query = PhysicsRayQueryParameters3D.create(ray_origin, ray_end)
	query.exclude = [self]
	var result = space_state.intersect_ray(query)
	if result and result.collider.has_method("take_damage"):
		set_target(result.collider, start_attack)
	elif not start_attack:
		# Nur bei Linksklick ins Leere: Ziel deselektieren und Autoattack stoppen
		# Rechtsklick wird für Kameradrehung verwendet
		clear_target()

func _physics_process(delta):
	# Global Cooldown herunterzählen (gilt für alle Aktionen)
	if global_cooldown > 0:
		global_cooldown -= delta

	# Wenn GCD bereit und Autoattack aktiv, versuche anzugreifen
	if global_cooldown <= 0 and autoattack_active:
		perform_autoattack()

	# Skill-Cooldowns herunterzählen
	if heavy_strike_cooldown > 0:
		heavy_strike_cooldown -= delta

	# HUD Cooldowns aktualisieren
	hud.set_slot_cooldown(0, global_cooldown)  # Slot 1: GCD (Autoattack)
	hud.set_slot_cooldown(1, heavy_strike_cooldown)  # Slot 2: Heavy Strike CD

	# Schwerkraft
	if not is_on_floor():
		velocity.y -= GRAVITY * delta

	# Springen
	if Input.is_action_just_pressed("ui_accept") and is_on_floor():
		velocity.y = JUMP_VELOCITY

	# Linksklick: nur markieren
	if Input.is_action_just_pressed("select_target"):
		_try_select_target(false)

	# Rechtsklick: markieren + angreifen
	if Input.is_action_just_pressed("ui_right_mouse"):
		_try_select_target(true)

	# Aktionsleiste 1-9
	if Input.is_action_just_pressed("action_1"):
		hud.set_active_slot(0)
		if target != null and global_cooldown <= 0:
			start_autoattack()
			perform_autoattack()
	if Input.is_action_just_pressed("action_2"):
		hud.set_active_slot(1)
		use_heavy_strike()
	if Input.is_action_just_pressed("action_3"):
		hud.set_active_slot(2)
	if Input.is_action_just_pressed("action_4"):
		hud.set_active_slot(3)
	if Input.is_action_just_pressed("action_5"):
		hud.set_active_slot(4)
	if Input.is_action_just_pressed("action_6"):
		hud.set_active_slot(5)
	if Input.is_action_just_pressed("action_7"):
		hud.set_active_slot(6)
	if Input.is_action_just_pressed("action_8"):
		hud.set_active_slot(7)
	if Input.is_action_just_pressed("action_9"):
		hud.set_active_slot(8)

	# TEST: T drücken = 10 Schaden
	if Input.is_action_just_pressed("test_damage"):
		take_damage(10)

	# C drücken = Charakter-Panel öffnen/schließen
	if Input.is_action_just_pressed("toggle_character"):
		character_panel.update_stats(self)
		character_panel.toggle()

	# I drücken = Inventar öffnen/schließen
	if Input.is_action_just_pressed("toggle_inventory"):
		inventory_panel.toggle()

	# Eingabe
	var input_dir = Vector2.ZERO
	if Input.is_action_pressed("move_forward"):
		input_dir.y -= 1
	if Input.is_action_pressed("move_back"):
		input_dir.y += 1
	if Input.is_action_pressed("move_left"):
		input_dir.x -= 1
	if Input.is_action_pressed("move_right"):
		input_dir.x += 1

	# Bewegung relativ zur Kamera
	var world_yaw = rotation.y + camera_pivot.rotation.y
	var forward = Vector3(-sin(world_yaw), 0, -cos(world_yaw)).normalized()
	var right = Vector3(cos(world_yaw), 0, -sin(world_yaw)).normalized()
	var direction = (forward * -input_dir.y + right * input_dir.x)

	velocity.x = direction.x * SPEED
	velocity.z = direction.z * SPEED

	# RMB gehalten: Spieler schaut in Kamerarichtung
	if Input.is_mouse_button_pressed(MOUSE_BUTTON_RIGHT):
		rotation.y = world_yaw
		camera_pivot.rotation.y = 0

	move_and_slide()