using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;

public class Game : MonoBehaviour
{
    // Auto-bootstrap when game starts - no Editor setup needed
    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
    static void Bootstrap()
    {
        if (Instance != null) return;

        var gameGO = new GameObject("Game");
        gameGO.AddComponent<Game>();
    }

    // ===========================================
    // CONFIGURATION - All tunable constants here
    // ===========================================

    // Gameplay
    public const int UnitsPerTeam = 3;
    public const float UnitSpeed = 5f;
    public const float UnitSize = 1f;
    public const float UnitColliderRadius = 0.5f;

    // Vision & Detection
    public const float VisionRadius = 4f;
    public const float TagRadius = 0.75f;
    public const float FlagPickupRadius = 0.75f;

    // Timing
    public const float RespawnDelay = 5f;
    public const float FlagReturnDelay = 5f;

    // Scoring
    public const int WinScore = 3;

    // Map - 9:19 aspect ratio for smartphone (portrait)
    public const float MapWidth = 18f;
    public const float MapHeight = 38f;

    // Bases
    public const float BaseSize = 5f;
    public const float BaseInset = 4f; // Distance from map edge

    // Houses
    public const float HouseMinSize = 2f;
    public const float HouseMaxSize = 4f;

    // References set during setup
    public static Game Instance { get; private set; }

    public List<Unit> playerUnits = new();
    public List<Unit> enemyUnits = new();
    public Transform playerBase;
    public Transform enemyBase;
    public Flag playerFlag;
    public Flag enemyFlag;

    int playerScore;
    int enemyScore;
    bool gameOver;

    TextMeshProUGUI scoreText;
    TextMeshProUGUI gameOverText;

    void Awake()
    {
        Instance = this;
    }

    void Start()
    {
        SetupCamera();
        CreateGround();
        CreateObstacles();
        CreateBases();
        CreateFlags();
        SpawnUnits();
        CreateUI();
        SetupSystems();
    }

    void SetupCamera()
    {
        var cam = Camera.main;
        if (cam != null)
        {
            cam.orthographic = true;
            cam.orthographicSize = MapHeight / 2f + 2f;
            cam.transform.position = new Vector3(0, 0, -10);
        }
    }

    void CreateGround()
    {
        var ground = CreateSprite("Ground", new Color(0.2f, 0.4f, 0.2f), MapWidth, MapHeight);
        ground.transform.position = Vector3.zero;
        var sr = ground.GetComponent<SpriteRenderer>();
        sr.sortingOrder = -10;
    }

    void CreateObstacles()
    {
        // Dense house layout creating multiple route choices
        // Layout designed for 18x38 map with bases at corners
        // Houses create lanes, chokepoints, and flanking routes

        Vector2[] housePositions = {
            // Bottom section (near player base) - create 3 exit routes
            new(-4f, -14f),
            new(4f, -12f),
            new(0f, -10f),

            // Lower-mid section - force route decisions
            new(-6f, -6f),
            new(-2f, -4f),
            new(3f, -7f),
            new(6f, -3f),

            // Center section - dense, creates cat-and-mouse area
            new(-5f, 2f),
            new(-1f, 0f),
            new(2f, 3f),
            new(5f, -1f),
            new(0f, 5f),

            // Upper-mid section - mirror complexity
            new(-6f, 8f),
            new(-2f, 10f),
            new(4f, 7f),
            new(6f, 11f),

            // Top section (near enemy base) - create 3 approach routes
            new(-4f, 14f),
            new(0f, 12f),
            new(5f, 15f),
        };

        Vector2[] houseSizes = {
            // Bottom section
            new(3f, 2.5f),
            new(2.5f, 3f),
            new(2f, 2f),

            // Lower-mid
            new(2.5f, 3f),
            new(3f, 2f),
            new(2f, 2.5f),
            new(2.5f, 2.5f),

            // Center - varied sizes for interesting gaps
            new(3f, 2f),
            new(2f, 3f),
            new(2.5f, 2f),
            new(2f, 2.5f),
            new(2f, 2f),

            // Upper-mid
            new(2.5f, 2.5f),
            new(2f, 3f),
            new(3f, 2.5f),
            new(2f, 2f),

            // Top section
            new(2.5f, 3f),
            new(3f, 2f),
            new(2f, 2.5f),
        };

        for (int i = 0; i < housePositions.Length; i++)
        {
            var house = CreateSprite($"House_{i}", new Color(0.35f, 0.35f, 0.4f), houseSizes[i].x, houseSizes[i].y);
            house.transform.position = new Vector3(housePositions[i].x, housePositions[i].y, 0);

            var collider = house.AddComponent<BoxCollider2D>();
            collider.size = Vector2.one; // Local space - scale handles actual size

            var sr = house.GetComponent<SpriteRenderer>();
            sr.sortingOrder = -5;
        }
    }

    void CreateBases()
    {
        // Player base - bottom center
        var playerBaseGO = CreateSprite("PlayerBase", new Color(0.2f, 0.3f, 0.8f, 0.5f), BaseSize, BaseSize);
        playerBaseGO.transform.position = new Vector3(0, -MapHeight / 2f + BaseInset, 0);
        playerBase = playerBaseGO.transform;
        var sr1 = playerBaseGO.GetComponent<SpriteRenderer>();
        sr1.sortingOrder = -8;

        var playerBaseTrigger = playerBaseGO.AddComponent<BoxCollider2D>();
        playerBaseTrigger.isTrigger = true;
        playerBaseTrigger.size = Vector2.one;

        var playerBaseZone = playerBaseGO.AddComponent<BaseZone>();
        playerBaseZone.team = Unit.Team.Player;

        // Enemy base - top center
        var enemyBaseGO = CreateSprite("EnemyBase", new Color(0.8f, 0.2f, 0.2f, 0.5f), BaseSize, BaseSize);
        enemyBaseGO.transform.position = new Vector3(0, MapHeight / 2f - BaseInset, 0);
        enemyBase = enemyBaseGO.transform;
        var sr2 = enemyBaseGO.GetComponent<SpriteRenderer>();
        sr2.sortingOrder = -8;

        var enemyBaseTrigger = enemyBaseGO.AddComponent<BoxCollider2D>();
        enemyBaseTrigger.isTrigger = true;
        enemyBaseTrigger.size = Vector2.one;

        var enemyBaseZone = enemyBaseGO.AddComponent<BaseZone>();
        enemyBaseZone.team = Unit.Team.Enemy;
    }

    void CreateFlags()
    {
        // Player flag at player base
        var playerFlagGO = CreateSprite("PlayerFlag", new Color(0.3f, 0.5f, 1f), 1f, 1.5f);
        playerFlagGO.transform.position = playerBase.position;
        playerFlag = playerFlagGO.AddComponent<Flag>();
        playerFlag.team = Unit.Team.Player;
        playerFlag.homePosition = playerBase;

        var flagCollider1 = playerFlagGO.AddComponent<CircleCollider2D>();
        flagCollider1.isTrigger = true;
        flagCollider1.radius = FlagPickupRadius;

        var rb1 = playerFlagGO.AddComponent<Rigidbody2D>();
        rb1.bodyType = RigidbodyType2D.Kinematic;

        var sr1 = playerFlagGO.GetComponent<SpriteRenderer>();
        sr1.sortingOrder = 5;

        // Enemy flag at enemy base
        var enemyFlagGO = CreateSprite("EnemyFlag", new Color(1f, 0.3f, 0.3f), 1f, 1.5f);
        enemyFlagGO.transform.position = enemyBase.position;
        enemyFlag = enemyFlagGO.AddComponent<Flag>();
        enemyFlag.team = Unit.Team.Enemy;
        enemyFlag.homePosition = enemyBase;

        var flagCollider2 = enemyFlagGO.AddComponent<CircleCollider2D>();
        flagCollider2.isTrigger = true;
        flagCollider2.radius = FlagPickupRadius;

        var rb2 = enemyFlagGO.AddComponent<Rigidbody2D>();
        rb2.bodyType = RigidbodyType2D.Kinematic;

        var sr2 = enemyFlagGO.GetComponent<SpriteRenderer>();
        sr2.sortingOrder = 5;
    }

    void SpawnUnits()
    {
        // Spawn player units near player base
        for (int i = 0; i < UnitsPerTeam; i++)
        {
            var offset = GetUnitSpawnOffset(i, UnitsPerTeam, isPlayer: true);
            var unit = CreateUnit($"PlayerUnit_{i}", Unit.Team.Player, playerBase.position + offset);
            playerUnits.Add(unit);
        }

        // Spawn enemy units near enemy base
        for (int i = 0; i < UnitsPerTeam; i++)
        {
            var offset = GetUnitSpawnOffset(i, UnitsPerTeam, isPlayer: false);
            var unit = CreateUnit($"EnemyUnit_{i}", Unit.Team.Enemy, enemyBase.position + offset);
            enemyUnits.Add(unit);
        }
    }

    Vector3 GetUnitSpawnOffset(int index, int total, bool isPlayer)
    {
        float spacing = 1.8f;
        float xOffset = (index - (total - 1) / 2f) * spacing;
        float yOffset = isPlayer ? -2f : 2f;
        return new Vector3(xOffset, yOffset, 0);
    }

    Unit CreateUnit(string name, Unit.Team team, Vector3 position)
    {
        Color color = team == Unit.Team.Player ? new Color(0.3f, 0.5f, 1f) : new Color(1f, 0.3f, 0.3f);
        var unitGO = CreateSprite(name, color, UnitSize, UnitSize);
        unitGO.transform.position = position;

        var unit = unitGO.AddComponent<Unit>();
        unit.team = team;

        var collider = unitGO.AddComponent<CircleCollider2D>();
        collider.isTrigger = true;
        collider.radius = UnitColliderRadius;

        var rb = unitGO.AddComponent<Rigidbody2D>();
        rb.bodyType = RigidbodyType2D.Kinematic;

        var sr = unitGO.GetComponent<SpriteRenderer>();
        sr.sortingOrder = 10;

        return unit;
    }

    void CreateUI()
    {
        // Create Canvas
        var canvasGO = new GameObject("Canvas");
        var canvas = canvasGO.AddComponent<Canvas>();
        canvas.renderMode = RenderMode.ScreenSpaceOverlay;
        canvasGO.AddComponent<UnityEngine.UI.CanvasScaler>();
        canvasGO.AddComponent<UnityEngine.UI.GraphicRaycaster>();

        // Score text
        var scoreGO = new GameObject("ScoreText");
        scoreGO.transform.SetParent(canvasGO.transform, false);
        scoreText = scoreGO.AddComponent<TextMeshProUGUI>();
        scoreText.text = "0 - 0";
        scoreText.fontSize = 48;
        scoreText.alignment = TextAlignmentOptions.Center;
        scoreText.color = Color.white;

        var scoreRect = scoreGO.GetComponent<RectTransform>();
        scoreRect.anchorMin = new Vector2(0.5f, 1f);
        scoreRect.anchorMax = new Vector2(0.5f, 1f);
        scoreRect.pivot = new Vector2(0.5f, 1f);
        scoreRect.anchoredPosition = new Vector2(0, -20);
        scoreRect.sizeDelta = new Vector2(200, 60);

        // Game over text (hidden initially)
        var gameOverGO = new GameObject("GameOverText");
        gameOverGO.transform.SetParent(canvasGO.transform, false);
        gameOverText = gameOverGO.AddComponent<TextMeshProUGUI>();
        gameOverText.text = "";
        gameOverText.fontSize = 72;
        gameOverText.alignment = TextAlignmentOptions.Center;
        gameOverText.color = Color.white;
        gameOverText.gameObject.SetActive(false);

        var gameOverRect = gameOverGO.GetComponent<RectTransform>();
        gameOverRect.anchorMin = new Vector2(0.5f, 0.5f);
        gameOverRect.anchorMax = new Vector2(0.5f, 0.5f);
        gameOverRect.pivot = new Vector2(0.5f, 0.5f);
        gameOverRect.anchoredPosition = Vector2.zero;
        gameOverRect.sizeDelta = new Vector2(400, 100);
    }

    void SetupSystems()
    {
        // Add RouteDrawer
        gameObject.AddComponent<RouteDrawer>();

        // Add Visibility system
        var visibility = gameObject.AddComponent<Visibility>();
        visibility.playerUnits = playerUnits.ToArray();
        visibility.enemyUnits = enemyUnits.ToArray();
        visibility.enemyFlag = enemyFlag;

        // Add SimpleAI
        var ai = gameObject.AddComponent<SimpleAI>();
        ai.aiUnits = enemyUnits.ToArray();
        ai.playerFlag = playerFlag;
        ai.aiBase = enemyBase;
    }

    public void Score(Unit.Team team)
    {
        if (gameOver) return;

        if (team == Unit.Team.Player)
            playerScore++;
        else
            enemyScore++;

        UpdateScoreUI();
        Debug.Log($"Score: {playerScore} - {enemyScore}");

        if (playerScore >= WinScore)
            EndGame(true);
        else if (enemyScore >= WinScore)
            EndGame(false);
        else
            ResetRound();
    }

    void UpdateScoreUI()
    {
        if (scoreText != null)
            scoreText.text = $"{playerScore} - {enemyScore}";
    }

    void ResetRound()
    {
        // Return flags to home
        playerFlag.ReturnHome();
        enemyFlag.ReturnHome();

        // Respawn all units at bases
        for (int i = 0; i < playerUnits.Count; i++)
        {
            var offset = GetUnitSpawnOffset(i, playerUnits.Count, isPlayer: true);
            playerUnits[i].ForceRespawn(playerBase.position + offset);
        }

        for (int i = 0; i < enemyUnits.Count; i++)
        {
            var offset = GetUnitSpawnOffset(i, enemyUnits.Count, isPlayer: false);
            enemyUnits[i].ForceRespawn(enemyBase.position + offset);
        }
    }

    void EndGame(bool playerWon)
    {
        gameOver = true;

        if (gameOverText != null)
        {
            gameOverText.text = playerWon ? "YOU WIN!" : "YOU LOSE!";
            gameOverText.color = playerWon ? Color.green : Color.red;
            gameOverText.gameObject.SetActive(true);
        }

        Debug.Log(playerWon ? "Player wins!" : "Enemy wins!");
    }

    public Transform GetBase(Unit.Team team)
    {
        return team == Unit.Team.Player ? playerBase : enemyBase;
    }

    public Flag GetFlag(Unit.Team team)
    {
        return team == Unit.Team.Player ? playerFlag : enemyFlag;
    }

    // Helper to create a colored sprite
    GameObject CreateSprite(string name, Color color, float width, float height)
    {
        var go = new GameObject(name);
        var sr = go.AddComponent<SpriteRenderer>();
        sr.sprite = CreateRectSprite();
        sr.color = color;
        go.transform.localScale = new Vector3(width, height, 1);
        return go;
    }

    // Create a simple white 1x1 sprite
    static Sprite cachedSprite;
    static Sprite CreateRectSprite()
    {
        if (cachedSprite != null) return cachedSprite;

        var tex = new Texture2D(1, 1);
        tex.SetPixel(0, 0, Color.white);
        tex.Apply();

        cachedSprite = Sprite.Create(tex, new Rect(0, 0, 1, 1), new Vector2(0.5f, 0.5f), 1);
        return cachedSprite;
    }
}

// Simple component to identify base zones
public class BaseZone : MonoBehaviour
{
    public Unit.Team team;
}