using Hallucinate.GameSetup.Maze.Extensions;
using UnityEngine;

namespace Hallucinate.GameSetup.Maze
{
    /// <summary>
    /// A recursive backtracker algorithm for maze generation. 
    /// It explores the grid randomly and backtracks when it reaches a dead end.
    /// </summary>
    public class Recursive : Maze
    {
        /// <summary>
        /// Entry point for the recursive generation.
        /// Starts from a fixed position (5, 5).
        /// </summary>
        public override void Generate()
        {
            Generate(5, 5);
        }

        /// <summary>
        /// Internal recursive method that carves corridors by exploring neighbors in a random order.
        /// </summary>
        /// <param name="x">The current X coordinate.</param>
        /// <param name="z">The current Z coordinate.</param>
        protected void Generate(int x, int z)
        {
            if (CountSquareNeighbours(x, z) >= 2) return;
            
            map[x, z] = Corridor;

            directions.Shuffle();

            Generate(x + directions[0].x, z + directions[0].z);
            Generate(x + directions[1].x, z + directions[1].z);
            Generate(x + directions[2].x, z + directions[2].z);
            Generate(x + directions[3].x, z + directions[3].z);
        }
    }
}