// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "GameplayTagAssetInterface.h"
#include "MGameMode.generated.h"

UENUM(BlueprintType)
enum class EWaveState : uint8
{
	WaitingToStart,
	WaveInProgress,
	WaitingToComplete, // All the enemies have been spawned and we're waiting for them to be destroyed or for the player to die to move to next state
	WaveComplete,
	GameOver,
	LevelComplete
};

DECLARE_DYNAMIC_MULTICAST_DELEGATE_ThreeParams(FOnActorKilledSignature, AActor*, VictimActor, AActor*, KillerActor, AController*, KillerController);

UCLASS()
class MECHDEFENCE_API AMGameMode : public AGameModeBase
{
	GENERATED_BODY()

protected:
	UPROPERTY(EditDefaultsOnly, Category = "GameMode")
	TSubclassOf<AActor> SpectatingViewPointClass;

	UPROPERTY(EditDefaultsOnly, Category = "GameMode")
	float LevelEndViewTargetBlendTime;

	UPROPERTY(EditDefaultsOnly, Category = "GameMode")
	float TimeBetweenWaves;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "GameMode")
	int WaveCount;

	UPROPERTY(EditDefaultsOnly, Category = "GameMode")
	int MaxEnemiesInWave;

	UPROPERTY(EditDefaultsOnly, Category = "GameMode")
	int MinEnemiesInWave;
	
	UPROPERTY(EditDefaultsOnly, meta = (Tooltip = "These are the tags that are used to check how many enemies spawned in the current wave remain in the level"), Category = "GameMode")
	FGameplayTagContainer SpawnedEnemyTags;

	virtual void StartPlay() override;

	UFUNCTION(BlueprintCallable)
	void HandlePlayerKilled();

	UFUNCTION(BlueprintCallable)
	void HandlePlayerVehicleDestroyed(AActor* Vehicle);

	UFUNCTION(BlueprintCallable)
	void GameOver();

	UFUNCTION(BlueprintCallable)
	void LevelCompleted();

	UFUNCTION(BlueprintCallable, BlueprintImplementableEvent, Category = "GameMode")
	void SpawnNewEnemy();

	UFUNCTION(BlueprintImplementableEvent, Category = "GameMode")
	void WaveStateChanged(EWaveState NewState, EWaveState OldState);

	UFUNCTION(BlueprintCallable, Category = "GameMode")
	void StartWave();
	
	void PrepareForNextWave();
	void EndWave();
	void CheckWaveState();
	void SetWaveState(EWaveState NewWaveState);
	void SpawnEnemyTimerElapsed();

	int NumEnemiesToSpawn;

	FTimerHandle TimerHandle_NextWaveStart;
	FTimerHandle TimerHandle_EnemySpawn;

	EWaveState WaveState;
	
public:
	UPROPERTY(BlueprintAssignable, Category = "GameMode")
	FOnActorKilledSignature OnActorKilled;

	UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = "GameMode")
	int NumEnemiesKilled;

	void Tick(float DeltaSeconds) override;

	AMGameMode();
};